Added experimental Win NT sync patches
This commit is contained in:
parent
4c093e2855
commit
3beba205e5
|
@ -0,0 +1,106 @@
|
||||||
|
ntsync uses a misc device as the simplest and least intrusive uAPI interface.
|
||||||
|
|
||||||
|
Each file description on the device represents an isolated NT instance, intended
|
||||||
|
to correspond to a single NT virtual machine.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/Kconfig | 9 ++++++++
|
||||||
|
drivers/misc/Makefile | 1 +
|
||||||
|
drivers/misc/ntsync.c | 53 +++++++++++++++++++++++++++++++++++++++++++
|
||||||
|
3 files changed, 63 insertions(+)
|
||||||
|
create mode 100644 drivers/misc/ntsync.c
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
|
||||||
|
index 4fb291f0bf7c..bdd8a71bd853 100644
|
||||||
|
--- a/drivers/misc/Kconfig
|
||||||
|
+++ b/drivers/misc/Kconfig
|
||||||
|
@@ -504,6 +504,15 @@ config OPEN_DICE
|
||||||
|
measured boot flow. Userspace can use CDIs for remote attestation
|
||||||
|
and sealing.
|
||||||
|
|
||||||
|
+config NTSYNC
|
||||||
|
+ tristate "NT synchronization primitive emulation"
|
||||||
|
+ help
|
||||||
|
+ This module provides kernel support for emulation of Windows NT
|
||||||
|
+ synchronization primitives. It is not a hardware driver.
|
||||||
|
+
|
||||||
|
+ To compile this driver as a module, choose M here: the
|
||||||
|
+ module will be called ntsync.
|
||||||
|
+
|
||||||
|
If unsure, say N.
|
||||||
|
|
||||||
|
config VCPU_STALL_DETECTOR
|
||||||
|
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
|
||||||
|
index ea6ea5bbbc9c..153a3f4837e8 100644
|
||||||
|
--- a/drivers/misc/Makefile
|
||||||
|
+++ b/drivers/misc/Makefile
|
||||||
|
@@ -59,6 +59,7 @@ obj-$(CONFIG_PVPANIC) += pvpanic/
|
||||||
|
obj-$(CONFIG_UACCE) += uacce/
|
||||||
|
obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o
|
||||||
|
obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o
|
||||||
|
+obj-$(CONFIG_NTSYNC) += ntsync.o
|
||||||
|
obj-$(CONFIG_HI6421V600_IRQ) += hi6421v600-irq.o
|
||||||
|
obj-$(CONFIG_OPEN_DICE) += open-dice.o
|
||||||
|
obj-$(CONFIG_GP_PCI1XXXX) += mchp_pci1xxxx/
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
new file mode 100644
|
||||||
|
index 000000000000..9424c6210e51
|
||||||
|
--- /dev/null
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -0,0 +1,53 @@
|
||||||
|
+// SPDX-License-Identifier: GPL-2.0-only
|
||||||
|
+/*
|
||||||
|
+ * ntsync.c - Kernel driver for NT synchronization primitives
|
||||||
|
+ *
|
||||||
|
+ * Copyright (C) 2021-2022 Elizabeth Figura
|
||||||
|
+ */
|
||||||
|
+
|
||||||
|
+#include <linux/fs.h>
|
||||||
|
+#include <linux/miscdevice.h>
|
||||||
|
+#include <linux/module.h>
|
||||||
|
+
|
||||||
|
+#define NTSYNC_NAME "ntsync"
|
||||||
|
+
|
||||||
|
+static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
+{
|
||||||
|
+ return nonseekable_open(inode, file);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
+{
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
+ unsigned long parm)
|
||||||
|
+{
|
||||||
|
+ switch (cmd) {
|
||||||
|
+ default:
|
||||||
|
+ return -ENOIOCTLCMD;
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static const struct file_operations ntsync_fops = {
|
||||||
|
+ .owner = THIS_MODULE,
|
||||||
|
+ .open = ntsync_char_open,
|
||||||
|
+ .release = ntsync_char_release,
|
||||||
|
+ .unlocked_ioctl = ntsync_char_ioctl,
|
||||||
|
+ .compat_ioctl = ntsync_char_ioctl,
|
||||||
|
+ .llseek = no_llseek,
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+static struct miscdevice ntsync_misc = {
|
||||||
|
+ .minor = MISC_DYNAMIC_MINOR,
|
||||||
|
+ .name = NTSYNC_NAME,
|
||||||
|
+ .fops = &ntsync_fops,
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+module_misc_device(ntsync_misc);
|
||||||
|
+
|
||||||
|
+MODULE_AUTHOR("Elizabeth Figura");
|
||||||
|
+MODULE_DESCRIPTION("Kernel driver for NT synchronization primitives");
|
||||||
|
+MODULE_LICENSE("GPL");
|
||||||
|
+MODULE_ALIAS("devname:" NTSYNC_NAME);
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,68 @@
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
Documentation/admin-guide/devices.txt | 3 ++-
|
||||||
|
Documentation/userspace-api/ioctl/ioctl-number.rst | 2 ++
|
||||||
|
drivers/misc/ntsync.c | 3 ++-
|
||||||
|
include/linux/miscdevice.h | 1 +
|
||||||
|
4 files changed, 7 insertions(+), 2 deletions(-)
|
||||||
|
|
||||||
|
diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
|
||||||
|
index 94c98be1329a..041404397ee5 100644
|
||||||
|
--- a/Documentation/admin-guide/devices.txt
|
||||||
|
+++ b/Documentation/admin-guide/devices.txt
|
||||||
|
@@ -376,8 +376,9 @@
|
||||||
|
240 = /dev/userio Serio driver testing device
|
||||||
|
241 = /dev/vhost-vsock Host kernel driver for virtio vsock
|
||||||
|
242 = /dev/rfkill Turning off radio transmissions (rfkill)
|
||||||
|
+ 243 = /dev/ntsync NT synchronization primitive device
|
||||||
|
|
||||||
|
- 243-254 Reserved for local use
|
||||||
|
+ 244-254 Reserved for local use
|
||||||
|
255 Reserved for MISC_DYNAMIC_MINOR
|
||||||
|
|
||||||
|
11 char Raw keyboard device (Linux/SPARC only)
|
||||||
|
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
|
||||||
|
index 457e16f06e04..a1326a5bc2e0 100644
|
||||||
|
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
|
||||||
|
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
|
||||||
|
@@ -378,6 +378,8 @@ Code Seq# Include File Comments
|
||||||
|
<mailto:thomas@winischhofer.net>
|
||||||
|
0xF6 all LTTng Linux Trace Toolkit Next Generation
|
||||||
|
<mailto:mathieu.desnoyers@efficios.com>
|
||||||
|
+0xF7 00-1F uapi/linux/ntsync.h NT synchronization primitives
|
||||||
|
+ <mailto:wine-devel@winehq.org>
|
||||||
|
0xF8 all arch/x86/include/uapi/asm/amd_hsmp.h AMD HSMP EPYC system management interface driver
|
||||||
|
<mailto:nchatrad@amd.com>
|
||||||
|
0xFD all linux/dm-ioctl.h
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 9424c6210e51..84b498e2b2d5 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -40,7 +40,7 @@ static const struct file_operations ntsync_fops = {
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct miscdevice ntsync_misc = {
|
||||||
|
- .minor = MISC_DYNAMIC_MINOR,
|
||||||
|
+ .minor = NTSYNC_MINOR,
|
||||||
|
.name = NTSYNC_NAME,
|
||||||
|
.fops = &ntsync_fops,
|
||||||
|
};
|
||||||
|
@@ -51,3 +51,4 @@ MODULE_AUTHOR("Elizabeth Figura");
|
||||||
|
MODULE_DESCRIPTION("Kernel driver for NT synchronization primitives");
|
||||||
|
MODULE_LICENSE("GPL");
|
||||||
|
MODULE_ALIAS("devname:" NTSYNC_NAME);
|
||||||
|
+MODULE_ALIAS_MISCDEV(NTSYNC_MINOR);
|
||||||
|
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
|
||||||
|
index c0fea6ca5076..fe5d9366fdf7 100644
|
||||||
|
--- a/include/linux/miscdevice.h
|
||||||
|
+++ b/include/linux/miscdevice.h
|
||||||
|
@@ -71,6 +71,7 @@
|
||||||
|
#define USERIO_MINOR 240
|
||||||
|
#define VHOST_VSOCK_MINOR 241
|
||||||
|
#define RFKILL_MINOR 242
|
||||||
|
+#define NTSYNC_MINOR 243
|
||||||
|
#define MISC_DYNAMIC_MINOR 255
|
||||||
|
|
||||||
|
struct device;
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,191 @@
|
||||||
|
These correspond to the NT syscalls NtCreateSemaphore() and NtClose().
|
||||||
|
Unlike those functions, however, these ioctls do not handle object names, or
|
||||||
|
lookup of existing objects, or handle reference counting, but simply create the
|
||||||
|
underlying primitive. The user space emulator is expected to implement those
|
||||||
|
functions if they are required.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 117 ++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 25 ++++++++
|
||||||
|
2 files changed, 142 insertions(+)
|
||||||
|
create mode 100644 include/uapi/linux/ntsync.h
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 84b498e2b2d5..3287b94be351 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -8,23 +8,140 @@
|
||||||
|
#include <linux/fs.h>
|
||||||
|
#include <linux/miscdevice.h>
|
||||||
|
#include <linux/module.h>
|
||||||
|
+#include <linux/slab.h>
|
||||||
|
+#include <linux/xarray.h>
|
||||||
|
+#include <uapi/linux/ntsync.h>
|
||||||
|
|
||||||
|
#define NTSYNC_NAME "ntsync"
|
||||||
|
|
||||||
|
+enum ntsync_type {
|
||||||
|
+ NTSYNC_TYPE_SEM,
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+struct ntsync_obj {
|
||||||
|
+ struct rcu_head rhead;
|
||||||
|
+ struct kref refcount;
|
||||||
|
+
|
||||||
|
+ enum ntsync_type type;
|
||||||
|
+
|
||||||
|
+ union {
|
||||||
|
+ struct {
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 max;
|
||||||
|
+ } sem;
|
||||||
|
+ } u;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+struct ntsync_device {
|
||||||
|
+ struct xarray objects;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+static void destroy_obj(struct kref *ref)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj = container_of(ref, struct ntsync_obj, refcount);
|
||||||
|
+
|
||||||
|
+ kfree_rcu(obj, rhead);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void put_obj(struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ kref_put(&obj->refcount, destroy_obj);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
{
|
||||||
|
+ struct ntsync_device *dev;
|
||||||
|
+
|
||||||
|
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
||||||
|
+ if (!dev)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+
|
||||||
|
+ xa_init_flags(&dev->objects, XA_FLAGS_ALLOC);
|
||||||
|
+
|
||||||
|
+ file->private_data = dev;
|
||||||
|
return nonseekable_open(inode, file);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
{
|
||||||
|
+ struct ntsync_device *dev = file->private_data;
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ unsigned long id;
|
||||||
|
+
|
||||||
|
+ xa_for_each(&dev->objects, id, obj)
|
||||||
|
+ put_obj(obj);
|
||||||
|
+
|
||||||
|
+ xa_destroy(&dev->objects);
|
||||||
|
+
|
||||||
|
+ kfree(dev);
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void init_obj(struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ kref_init(&obj->refcount);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_sem_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_sem_args args;
|
||||||
|
+ struct ntsync_obj *sem;
|
||||||
|
+ __u32 id;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ if (args.count > args.max)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ sem = kzalloc(sizeof(*sem), GFP_KERNEL);
|
||||||
|
+ if (!sem)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+
|
||||||
|
+ init_obj(sem);
|
||||||
|
+ sem->type = NTSYNC_TYPE_SEM;
|
||||||
|
+ sem->u.sem.count = args.count;
|
||||||
|
+ sem->u.sem.max = args.max;
|
||||||
|
+
|
||||||
|
+ ret = xa_alloc(&dev->objects, &id, sem, xa_limit_32b, GFP_KERNEL);
|
||||||
|
+ if (ret < 0) {
|
||||||
|
+ kfree(sem);
|
||||||
|
+ return ret;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return put_user(id, &user_args->sem);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_delete(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ __u32 id;
|
||||||
|
+
|
||||||
|
+ if (get_user(id, (__u32 __user *)argp))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ obj = xa_erase(&dev->objects, id);
|
||||||
|
+ if (!obj)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
+ struct ntsync_device *dev = file->private_data;
|
||||||
|
+ void __user *argp = (void __user *)parm;
|
||||||
|
+
|
||||||
|
switch (cmd) {
|
||||||
|
+ case NTSYNC_IOC_CREATE_SEM:
|
||||||
|
+ return ntsync_create_sem(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_DELETE:
|
||||||
|
+ return ntsync_delete(dev, argp);
|
||||||
|
default:
|
||||||
|
return -ENOIOCTLCMD;
|
||||||
|
}
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
new file mode 100644
|
||||||
|
index 000000000000..d97afc138dcc
|
||||||
|
--- /dev/null
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -0,0 +1,25 @@
|
||||||
|
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
||||||
|
+/*
|
||||||
|
+ * Kernel support for NT synchronization primitive emulation
|
||||||
|
+ *
|
||||||
|
+ * Copyright (C) 2021-2022 Elizabeth Figura
|
||||||
|
+ */
|
||||||
|
+
|
||||||
|
+#ifndef __LINUX_NTSYNC_H
|
||||||
|
+#define __LINUX_NTSYNC_H
|
||||||
|
+
|
||||||
|
+#include <linux/types.h>
|
||||||
|
+
|
||||||
|
+struct ntsync_sem_args {
|
||||||
|
+ __u32 sem;
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 max;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+#define NTSYNC_IOC_BASE 0xf7
|
||||||
|
+
|
||||||
|
+#define NTSYNC_IOC_CREATE_SEM _IOWR(NTSYNC_IOC_BASE, 0, \
|
||||||
|
+ struct ntsync_sem_args)
|
||||||
|
+#define NTSYNC_IOC_DELETE _IOW (NTSYNC_IOC_BASE, 1, __u32)
|
||||||
|
+
|
||||||
|
+#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,147 @@
|
||||||
|
This corresponds to the NT syscall NtReleaseSemaphore().
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 76 +++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 2 +
|
||||||
|
2 files changed, 78 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 3287b94be351..d1c91c2a4f1a 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -21,9 +21,11 @@ enum ntsync_type {
|
||||||
|
struct ntsync_obj {
|
||||||
|
struct rcu_head rhead;
|
||||||
|
struct kref refcount;
|
||||||
|
+ spinlock_t lock;
|
||||||
|
|
||||||
|
enum ntsync_type type;
|
||||||
|
|
||||||
|
+ /* The following fields are protected by the object lock. */
|
||||||
|
union {
|
||||||
|
struct {
|
||||||
|
__u32 count;
|
||||||
|
@@ -36,6 +38,19 @@ struct ntsync_device {
|
||||||
|
struct xarray objects;
|
||||||
|
};
|
||||||
|
|
||||||
|
+static struct ntsync_obj *get_obj(struct ntsync_device *dev, __u32 id)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+
|
||||||
|
+ rcu_read_lock();
|
||||||
|
+ obj = xa_load(&dev->objects, id);
|
||||||
|
+ if (obj && !kref_get_unless_zero(&obj->refcount))
|
||||||
|
+ obj = NULL;
|
||||||
|
+ rcu_read_unlock();
|
||||||
|
+
|
||||||
|
+ return obj;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static void destroy_obj(struct kref *ref)
|
||||||
|
{
|
||||||
|
struct ntsync_obj *obj = container_of(ref, struct ntsync_obj, refcount);
|
||||||
|
@@ -48,6 +63,18 @@ static void put_obj(struct ntsync_obj *obj)
|
||||||
|
kref_put(&obj->refcount, destroy_obj);
|
||||||
|
}
|
||||||
|
|
||||||
|
+static struct ntsync_obj *get_obj_typed(struct ntsync_device *dev, __u32 id,
|
||||||
|
+ enum ntsync_type type)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj = get_obj(dev, id);
|
||||||
|
+
|
||||||
|
+ if (obj && obj->type != type) {
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ return NULL;
|
||||||
|
+ }
|
||||||
|
+ return obj;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
{
|
||||||
|
struct ntsync_device *dev;
|
||||||
|
@@ -81,6 +108,7 @@ static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
static void init_obj(struct ntsync_obj *obj)
|
||||||
|
{
|
||||||
|
kref_init(&obj->refcount);
|
||||||
|
+ spin_lock_init(&obj->lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
@@ -131,6 +159,52 @@ static int ntsync_delete(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
+/*
|
||||||
|
+ * Actually change the semaphore state, returning -EOVERFLOW if it is made
|
||||||
|
+ * invalid.
|
||||||
|
+ */
|
||||||
|
+static int put_sem_state(struct ntsync_obj *sem, __u32 count)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&sem->lock);
|
||||||
|
+
|
||||||
|
+ if (sem->u.sem.count + count < sem->u.sem.count ||
|
||||||
|
+ sem->u.sem.count + count > sem->u.sem.max)
|
||||||
|
+ return -EOVERFLOW;
|
||||||
|
+
|
||||||
|
+ sem->u.sem.count += count;
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_sem_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_sem_args args;
|
||||||
|
+ struct ntsync_obj *sem;
|
||||||
|
+ __u32 prev_count;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ sem = get_obj_typed(dev, args.sem, NTSYNC_TYPE_SEM);
|
||||||
|
+ if (!sem)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ spin_lock(&sem->lock);
|
||||||
|
+
|
||||||
|
+ prev_count = sem->u.sem.count;
|
||||||
|
+ ret = put_sem_state(sem, args.count);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&sem->lock);
|
||||||
|
+
|
||||||
|
+ put_obj(sem);
|
||||||
|
+
|
||||||
|
+ if (!ret && put_user(prev_count, &user_args->count))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
@@ -142,6 +216,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_PUT_SEM:
|
||||||
|
+ return ntsync_put_sem(dev, argp);
|
||||||
|
default:
|
||||||
|
return -ENOIOCTLCMD;
|
||||||
|
}
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index d97afc138dcc..8c610d65f8ef 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -21,5 +21,7 @@ struct ntsync_sem_args {
|
||||||
|
#define NTSYNC_IOC_CREATE_SEM _IOWR(NTSYNC_IOC_BASE, 0, \
|
||||||
|
struct ntsync_sem_args)
|
||||||
|
#define NTSYNC_IOC_DELETE _IOW (NTSYNC_IOC_BASE, 1, __u32)
|
||||||
|
+#define NTSYNC_IOC_PUT_SEM _IOWR(NTSYNC_IOC_BASE, 2, \
|
||||||
|
+ struct ntsync_sem_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,318 @@
|
||||||
|
This corresponds to part of the functionality of the NT syscall
|
||||||
|
NtWaitForMultipleObjects(). Specifically, it implements the behaviour where
|
||||||
|
the third argument (wait_any) is TRUE, and it does not handle alertable waits.
|
||||||
|
Those features have been split out into separate patches to ease review.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 229 ++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 13 ++
|
||||||
|
2 files changed, 242 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index d1c91c2a4f1a..2e8d3c2d51a4 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -23,6 +23,8 @@ struct ntsync_obj {
|
||||||
|
struct kref refcount;
|
||||||
|
spinlock_t lock;
|
||||||
|
|
||||||
|
+ struct list_head any_waiters;
|
||||||
|
+
|
||||||
|
enum ntsync_type type;
|
||||||
|
|
||||||
|
/* The following fields are protected by the object lock. */
|
||||||
|
@@ -34,6 +36,28 @@ struct ntsync_obj {
|
||||||
|
} u;
|
||||||
|
};
|
||||||
|
|
||||||
|
+struct ntsync_q_entry {
|
||||||
|
+ struct list_head node;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ __u32 index;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+struct ntsync_q {
|
||||||
|
+ struct task_struct *task;
|
||||||
|
+ __u32 owner;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * Protected via atomic_cmpxchg(). Only the thread that wins the
|
||||||
|
+ * compare-and-swap may actually change object states and wake this
|
||||||
|
+ * task.
|
||||||
|
+ */
|
||||||
|
+ atomic_t signaled;
|
||||||
|
+
|
||||||
|
+ __u32 count;
|
||||||
|
+ struct ntsync_q_entry entries[];
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
struct ntsync_device {
|
||||||
|
struct xarray objects;
|
||||||
|
};
|
||||||
|
@@ -109,6 +133,26 @@ static void init_obj(struct ntsync_obj *obj)
|
||||||
|
{
|
||||||
|
kref_init(&obj->refcount);
|
||||||
|
spin_lock_init(&obj->lock);
|
||||||
|
+ INIT_LIST_HEAD(&obj->any_waiters);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void try_wake_any_sem(struct ntsync_obj *sem)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_q_entry *entry;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&sem->lock);
|
||||||
|
+
|
||||||
|
+ list_for_each_entry(entry, &sem->any_waiters, node) {
|
||||||
|
+ struct ntsync_q *q = entry->q;
|
||||||
|
+
|
||||||
|
+ if (!sem->u.sem.count)
|
||||||
|
+ break;
|
||||||
|
+
|
||||||
|
+ if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
|
||||||
|
+ sem->u.sem.count--;
|
||||||
|
+ wake_up_process(q->task);
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
}
|
||||||
|
|
||||||
|
static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
@@ -194,6 +238,8 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
|
||||||
|
prev_count = sem->u.sem.count;
|
||||||
|
ret = put_sem_state(sem, args.count);
|
||||||
|
+ if (!ret)
|
||||||
|
+ try_wake_any_sem(sem);
|
||||||
|
|
||||||
|
spin_unlock(&sem->lock);
|
||||||
|
|
||||||
|
@@ -205,6 +251,187 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
+{
|
||||||
|
+ int ret = 0;
|
||||||
|
+
|
||||||
|
+ do {
|
||||||
|
+ if (signal_pending(current)) {
|
||||||
|
+ ret = -ERESTARTSYS;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ set_current_state(TASK_INTERRUPTIBLE);
|
||||||
|
+ if (atomic_read(&q->signaled) != -1) {
|
||||||
|
+ ret = 0;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+ ret = schedule_hrtimeout(timeout, HRTIMER_MODE_ABS);
|
||||||
|
+ } while (ret < 0);
|
||||||
|
+ __set_current_state(TASK_RUNNING);
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+/*
|
||||||
|
+ * Allocate and initialize the ntsync_q structure, but do not queue us yet.
|
||||||
|
+ * Also, calculate the relative timeout.
|
||||||
|
+ */
|
||||||
|
+static int setup_wait(struct ntsync_device *dev,
|
||||||
|
+ const struct ntsync_wait_args *args,
|
||||||
|
+ ktime_t *ret_timeout, struct ntsync_q **ret_q)
|
||||||
|
+{
|
||||||
|
+ const __u32 count = args->count;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ ktime_t timeout = 0;
|
||||||
|
+ __u32 *ids;
|
||||||
|
+ __u32 i, j;
|
||||||
|
+
|
||||||
|
+ if (!args->owner || args->pad)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ if (args->count > NTSYNC_MAX_WAIT_COUNT)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ if (args->timeout) {
|
||||||
|
+ struct timespec64 to;
|
||||||
|
+
|
||||||
|
+ if (get_timespec64(&to, u64_to_user_ptr(args->timeout)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ if (!timespec64_valid(&to))
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ timeout = timespec64_to_ns(&to);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ ids = kmalloc_array(count, sizeof(*ids), GFP_KERNEL);
|
||||||
|
+ if (!ids)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+ if (copy_from_user(ids, u64_to_user_ptr(args->objs),
|
||||||
|
+ array_size(count, sizeof(*ids)))) {
|
||||||
|
+ kfree(ids);
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ q = kmalloc(struct_size(q, entries, count), GFP_KERNEL);
|
||||||
|
+ if (!q) {
|
||||||
|
+ kfree(ids);
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+ }
|
||||||
|
+ q->task = current;
|
||||||
|
+ q->owner = args->owner;
|
||||||
|
+ atomic_set(&q->signaled, -1);
|
||||||
|
+ q->count = count;
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = get_obj(dev, ids[i]);
|
||||||
|
+
|
||||||
|
+ if (!obj)
|
||||||
|
+ goto err;
|
||||||
|
+
|
||||||
|
+ entry->obj = obj;
|
||||||
|
+ entry->q = q;
|
||||||
|
+ entry->index = i;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ kfree(ids);
|
||||||
|
+
|
||||||
|
+ *ret_q = q;
|
||||||
|
+ *ret_timeout = timeout;
|
||||||
|
+ return 0;
|
||||||
|
+
|
||||||
|
+err:
|
||||||
|
+ for (j = 0; j < i; j++)
|
||||||
|
+ put_obj(q->entries[j].obj);
|
||||||
|
+ kfree(ids);
|
||||||
|
+ kfree(q);
|
||||||
|
+ return -EINVAL;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void try_wake_any_obj(struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ switch (obj->type) {
|
||||||
|
+ case NTSYNC_TYPE_SEM:
|
||||||
|
+ try_wake_any_sem(obj);
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_wait_args args;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ ktime_t timeout;
|
||||||
|
+ int signaled;
|
||||||
|
+ __u32 i;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ ret = setup_wait(dev, &args, &timeout, &q);
|
||||||
|
+ if (ret < 0)
|
||||||
|
+ return ret;
|
||||||
|
+
|
||||||
|
+ /* queue ourselves */
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+ list_add_tail(&entry->node, &obj->any_waiters);
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* check if we are already signaled */
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_obj *obj = q->entries[i].obj;
|
||||||
|
+
|
||||||
|
+ if (atomic_read(&q->signaled) != -1)
|
||||||
|
+ break;
|
||||||
|
+
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+ try_wake_any_obj(obj);
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* sleep */
|
||||||
|
+
|
||||||
|
+ ret = ntsync_schedule(q, args.timeout ? &timeout : NULL);
|
||||||
|
+
|
||||||
|
+ /* and finally, unqueue */
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+ list_del(&entry->node);
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ signaled = atomic_read(&q->signaled);
|
||||||
|
+ if (signaled != -1) {
|
||||||
|
+ struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
+
|
||||||
|
+ /* even if we caught a signal, we need to communicate success */
|
||||||
|
+ ret = 0;
|
||||||
|
+
|
||||||
|
+ if (put_user(signaled, &user_args->index))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+ } else if (!ret) {
|
||||||
|
+ ret = -ETIMEDOUT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ kfree(q);
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
@@ -218,6 +445,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
return ntsync_put_sem(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_WAIT_ANY:
|
||||||
|
+ return ntsync_wait_any(dev, argp);
|
||||||
|
default:
|
||||||
|
return -ENOIOCTLCMD;
|
||||||
|
}
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 8c610d65f8ef..10f07da7864e 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -16,6 +16,17 @@ struct ntsync_sem_args {
|
||||||
|
__u32 max;
|
||||||
|
};
|
||||||
|
|
||||||
|
+struct ntsync_wait_args {
|
||||||
|
+ __u64 timeout;
|
||||||
|
+ __u64 objs;
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 owner;
|
||||||
|
+ __u32 index;
|
||||||
|
+ __u32 pad;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+#define NTSYNC_MAX_WAIT_COUNT 64
|
||||||
|
+
|
||||||
|
#define NTSYNC_IOC_BASE 0xf7
|
||||||
|
|
||||||
|
#define NTSYNC_IOC_CREATE_SEM _IOWR(NTSYNC_IOC_BASE, 0, \
|
||||||
|
@@ -23,5 +34,7 @@ struct ntsync_sem_args {
|
||||||
|
#define NTSYNC_IOC_DELETE _IOW (NTSYNC_IOC_BASE, 1, __u32)
|
||||||
|
#define NTSYNC_IOC_PUT_SEM _IOWR(NTSYNC_IOC_BASE, 2, \
|
||||||
|
struct ntsync_sem_args)
|
||||||
|
+#define NTSYNC_IOC_WAIT_ANY _IOWR(NTSYNC_IOC_BASE, 3, \
|
||||||
|
+ struct ntsync_wait_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,357 @@
|
||||||
|
This corresponds to part of the functionality of the NT syscall
|
||||||
|
NtWaitForMultipleObjects(). Specifically, it implements the behaviour where
|
||||||
|
the third argument (wait_any) is FALSE, and it does not yet handle alertable
|
||||||
|
waits.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 241 ++++++++++++++++++++++++++++++++++--
|
||||||
|
include/uapi/linux/ntsync.h | 2 +
|
||||||
|
2 files changed, 235 insertions(+), 8 deletions(-)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 2e8d3c2d51a4..2685363fae9e 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -23,7 +23,34 @@ struct ntsync_obj {
|
||||||
|
struct kref refcount;
|
||||||
|
spinlock_t lock;
|
||||||
|
|
||||||
|
+ /*
|
||||||
|
+ * any_waiters is protected by the object lock, but all_waiters is
|
||||||
|
+ * protected by the device wait_all_lock.
|
||||||
|
+ */
|
||||||
|
struct list_head any_waiters;
|
||||||
|
+ struct list_head all_waiters;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * Hint describing how many tasks are queued on this object in a
|
||||||
|
+ * wait-all operation.
|
||||||
|
+ *
|
||||||
|
+ * Any time we do a wake, we may need to wake "all" waiters as well as
|
||||||
|
+ * "any" waiters. In order to atomically wake "all" waiters, we must
|
||||||
|
+ * lock all of the objects, and that means grabbing the wait_all_lock
|
||||||
|
+ * below (and, due to lock ordering rules, before locking this object).
|
||||||
|
+ * However, wait-all is a rare operation, and grabbing the wait-all
|
||||||
|
+ * lock for every wake would create unnecessary contention. Therefore we
|
||||||
|
+ * first check whether all_hint is zero, and, if it is, we skip trying
|
||||||
|
+ * to wake "all" waiters.
|
||||||
|
+ *
|
||||||
|
+ * This hint isn't protected by any lock. It might change during the
|
||||||
|
+ * course of a wake, but there's no meaningful race there; it's only a
|
||||||
|
+ * hint.
|
||||||
|
+ *
|
||||||
|
+ * Since wait requests must originate from user-space threads, we're
|
||||||
|
+ * limited here by PID_MAX_LIMIT, so there's no risk of saturation.
|
||||||
|
+ */
|
||||||
|
+ atomic_t all_hint;
|
||||||
|
|
||||||
|
enum ntsync_type type;
|
||||||
|
|
||||||
|
@@ -54,11 +81,25 @@ struct ntsync_q {
|
||||||
|
*/
|
||||||
|
atomic_t signaled;
|
||||||
|
|
||||||
|
+ bool all;
|
||||||
|
__u32 count;
|
||||||
|
struct ntsync_q_entry entries[];
|
||||||
|
};
|
||||||
|
|
||||||
|
struct ntsync_device {
|
||||||
|
+ /*
|
||||||
|
+ * Wait-all operations must atomically grab all objects, and be totally
|
||||||
|
+ * ordered with respect to each other and wait-any operations. If one
|
||||||
|
+ * thread is trying to acquire several objects, another thread cannot
|
||||||
|
+ * touch the object at the same time.
|
||||||
|
+ *
|
||||||
|
+ * We achieve this by grabbing multiple object locks at the same time.
|
||||||
|
+ * However, this creates a lock ordering problem. To solve that problem,
|
||||||
|
+ * wait_all_lock is taken first whenever multiple objects must be locked
|
||||||
|
+ * at the same time.
|
||||||
|
+ */
|
||||||
|
+ spinlock_t wait_all_lock;
|
||||||
|
+
|
||||||
|
struct xarray objects;
|
||||||
|
};
|
||||||
|
|
||||||
|
@@ -107,6 +148,8 @@ static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
if (!dev)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
+ spin_lock_init(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
xa_init_flags(&dev->objects, XA_FLAGS_ALLOC);
|
||||||
|
|
||||||
|
file->private_data = dev;
|
||||||
|
@@ -132,8 +175,81 @@ static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
static void init_obj(struct ntsync_obj *obj)
|
||||||
|
{
|
||||||
|
kref_init(&obj->refcount);
|
||||||
|
+ atomic_set(&obj->all_hint, 0);
|
||||||
|
spin_lock_init(&obj->lock);
|
||||||
|
INIT_LIST_HEAD(&obj->any_waiters);
|
||||||
|
+ INIT_LIST_HEAD(&obj->all_waiters);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static bool is_signaled(struct ntsync_obj *obj, __u32 owner)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&obj->lock);
|
||||||
|
+
|
||||||
|
+ switch (obj->type) {
|
||||||
|
+ case NTSYNC_TYPE_SEM:
|
||||||
|
+ return !!obj->u.sem.count;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ WARN(1, "bad object type %#x\n", obj->type);
|
||||||
|
+ return false;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+/*
|
||||||
|
+ * "locked_obj" is an optional pointer to an object which is already locked and
|
||||||
|
+ * should not be locked again. This is necessary so that changing an object's
|
||||||
|
+ * state and waking it can be a single atomic operation.
|
||||||
|
+ */
|
||||||
|
+static void try_wake_all(struct ntsync_device *dev, struct ntsync_q *q,
|
||||||
|
+ struct ntsync_obj *locked_obj)
|
||||||
|
+{
|
||||||
|
+ __u32 count = q->count;
|
||||||
|
+ bool can_wake = true;
|
||||||
|
+ __u32 i;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&dev->wait_all_lock);
|
||||||
|
+ if (locked_obj)
|
||||||
|
+ lockdep_assert_held(&locked_obj->lock);
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ if (q->entries[i].obj != locked_obj)
|
||||||
|
+ spin_lock_nest_lock(&q->entries[i].obj->lock, &dev->wait_all_lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ if (!is_signaled(q->entries[i].obj, q->owner)) {
|
||||||
|
+ can_wake = false;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (can_wake && atomic_cmpxchg(&q->signaled, -1, 0) == -1) {
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ struct ntsync_obj *obj = q->entries[i].obj;
|
||||||
|
+
|
||||||
|
+ switch (obj->type) {
|
||||||
|
+ case NTSYNC_TYPE_SEM:
|
||||||
|
+ obj->u.sem.count--;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+ wake_up_process(q->task);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ if (q->entries[i].obj != locked_obj)
|
||||||
|
+ spin_unlock(&q->entries[i].obj->lock);
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void try_wake_all_obj(struct ntsync_device *dev, struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_q_entry *entry;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&dev->wait_all_lock);
|
||||||
|
+ lockdep_assert_held(&obj->lock);
|
||||||
|
+
|
||||||
|
+ list_for_each_entry(entry, &obj->all_waiters, node)
|
||||||
|
+ try_wake_all(dev, entry->q, obj);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void try_wake_any_sem(struct ntsync_obj *sem)
|
||||||
|
@@ -234,14 +350,29 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
if (!sem)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
- spin_lock(&sem->lock);
|
||||||
|
+ if (atomic_read(&sem->all_hint) > 0) {
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+ spin_lock_nest_lock(&sem->lock, &dev->wait_all_lock);
|
||||||
|
|
||||||
|
- prev_count = sem->u.sem.count;
|
||||||
|
- ret = put_sem_state(sem, args.count);
|
||||||
|
- if (!ret)
|
||||||
|
- try_wake_any_sem(sem);
|
||||||
|
+ prev_count = sem->u.sem.count;
|
||||||
|
+ ret = put_sem_state(sem, args.count);
|
||||||
|
+ if (!ret) {
|
||||||
|
+ try_wake_all_obj(dev, sem);
|
||||||
|
+ try_wake_any_sem(sem);
|
||||||
|
+ }
|
||||||
|
|
||||||
|
- spin_unlock(&sem->lock);
|
||||||
|
+ spin_unlock(&sem->lock);
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+ } else {
|
||||||
|
+ spin_lock(&sem->lock);
|
||||||
|
+
|
||||||
|
+ prev_count = sem->u.sem.count;
|
||||||
|
+ ret = put_sem_state(sem, args.count);
|
||||||
|
+ if (!ret)
|
||||||
|
+ try_wake_any_sem(sem);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&sem->lock);
|
||||||
|
+ }
|
||||||
|
|
||||||
|
put_obj(sem);
|
||||||
|
|
||||||
|
@@ -278,7 +409,7 @@ static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
* Also, calculate the relative timeout.
|
||||||
|
*/
|
||||||
|
static int setup_wait(struct ntsync_device *dev,
|
||||||
|
- const struct ntsync_wait_args *args,
|
||||||
|
+ const struct ntsync_wait_args *args, bool all,
|
||||||
|
ktime_t *ret_timeout, struct ntsync_q **ret_q)
|
||||||
|
{
|
||||||
|
const __u32 count = args->count;
|
||||||
|
@@ -321,6 +452,7 @@ static int setup_wait(struct ntsync_device *dev,
|
||||||
|
q->task = current;
|
||||||
|
q->owner = args->owner;
|
||||||
|
atomic_set(&q->signaled, -1);
|
||||||
|
+ q->all = all;
|
||||||
|
q->count = count;
|
||||||
|
|
||||||
|
for (i = 0; i < count; i++) {
|
||||||
|
@@ -330,6 +462,16 @@ static int setup_wait(struct ntsync_device *dev,
|
||||||
|
if (!obj)
|
||||||
|
goto err;
|
||||||
|
|
||||||
|
+ if (all) {
|
||||||
|
+ /* Check that the objects are all distinct. */
|
||||||
|
+ for (j = 0; j < i; j++) {
|
||||||
|
+ if (obj == q->entries[j].obj) {
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ goto err;
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
entry->obj = obj;
|
||||||
|
entry->q = q;
|
||||||
|
entry->index = i;
|
||||||
|
@@ -370,7 +512,7 @@ static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
return -EFAULT;
|
||||||
|
|
||||||
|
- ret = setup_wait(dev, &args, &timeout, &q);
|
||||||
|
+ ret = setup_wait(dev, &args, false, &timeout, &q);
|
||||||
|
if (ret < 0)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
@@ -432,6 +574,87 @@ static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+static int ntsync_wait_all(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_wait_args args;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ ktime_t timeout;
|
||||||
|
+ int signaled;
|
||||||
|
+ __u32 i;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ ret = setup_wait(dev, &args, true, &timeout, &q);
|
||||||
|
+ if (ret < 0)
|
||||||
|
+ return ret;
|
||||||
|
+
|
||||||
|
+ /* queue ourselves */
|
||||||
|
+
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ atomic_inc(&obj->all_hint);
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * obj->all_waiters is protected by dev->wait_all_lock rather
|
||||||
|
+ * than obj->lock, so there is no need to acquire it here.
|
||||||
|
+ */
|
||||||
|
+ list_add_tail(&entry->node, &obj->all_waiters);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* check if we are already signaled */
|
||||||
|
+
|
||||||
|
+ try_wake_all(dev, q, NULL);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ /* sleep */
|
||||||
|
+
|
||||||
|
+ ret = ntsync_schedule(q, args.timeout ? &timeout : NULL);
|
||||||
|
+
|
||||||
|
+ /* and finally, unqueue */
|
||||||
|
+
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * obj->all_waiters is protected by dev->wait_all_lock rather
|
||||||
|
+ * than obj->lock, so there is no need to acquire it here.
|
||||||
|
+ */
|
||||||
|
+ list_del(&entry->node);
|
||||||
|
+
|
||||||
|
+ atomic_dec(&obj->all_hint);
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ signaled = atomic_read(&q->signaled);
|
||||||
|
+ if (signaled != -1) {
|
||||||
|
+ struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
+
|
||||||
|
+ /* even if we caught a signal, we need to communicate success */
|
||||||
|
+ ret = 0;
|
||||||
|
+
|
||||||
|
+ if (put_user(signaled, &user_args->index))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+ } else if (!ret) {
|
||||||
|
+ ret = -ETIMEDOUT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ kfree(q);
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
@@ -445,6 +668,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
return ntsync_put_sem(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_WAIT_ALL:
|
||||||
|
+ return ntsync_wait_all(dev, argp);
|
||||||
|
case NTSYNC_IOC_WAIT_ANY:
|
||||||
|
return ntsync_wait_any(dev, argp);
|
||||||
|
default:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 10f07da7864e..a5bed5a39b21 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -36,5 +36,7 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_sem_args)
|
||||||
|
#define NTSYNC_IOC_WAIT_ANY _IOWR(NTSYNC_IOC_BASE, 3, \
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
+#define NTSYNC_IOC_WAIT_ALL _IOWR(NTSYNC_IOC_BASE, 4, \
|
||||||
|
+ struct ntsync_wait_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,167 @@
|
||||||
|
This corresponds to the NT syscall NtCreateMutant().
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 72 +++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 8 +++++
|
||||||
|
2 files changed, 80 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 2685363fae9e..d48f2ef41341 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -16,6 +16,7 @@
|
||||||
|
|
||||||
|
enum ntsync_type {
|
||||||
|
NTSYNC_TYPE_SEM,
|
||||||
|
+ NTSYNC_TYPE_MUTEX,
|
||||||
|
};
|
||||||
|
|
||||||
|
struct ntsync_obj {
|
||||||
|
@@ -60,6 +61,10 @@ struct ntsync_obj {
|
||||||
|
__u32 count;
|
||||||
|
__u32 max;
|
||||||
|
} sem;
|
||||||
|
+ struct {
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 owner;
|
||||||
|
+ } mutex;
|
||||||
|
} u;
|
||||||
|
};
|
||||||
|
|
||||||
|
@@ -188,6 +193,10 @@ static bool is_signaled(struct ntsync_obj *obj, __u32 owner)
|
||||||
|
switch (obj->type) {
|
||||||
|
case NTSYNC_TYPE_SEM:
|
||||||
|
return !!obj->u.sem.count;
|
||||||
|
+ case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ if (obj->u.mutex.owner && obj->u.mutex.owner != owner)
|
||||||
|
+ return false;
|
||||||
|
+ return obj->u.mutex.count < UINT_MAX;
|
||||||
|
}
|
||||||
|
|
||||||
|
WARN(1, "bad object type %#x\n", obj->type);
|
||||||
|
@@ -230,6 +239,10 @@ static void try_wake_all(struct ntsync_device *dev, struct ntsync_q *q,
|
||||||
|
case NTSYNC_TYPE_SEM:
|
||||||
|
obj->u.sem.count--;
|
||||||
|
break;
|
||||||
|
+ case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ obj->u.mutex.count++;
|
||||||
|
+ obj->u.mutex.owner = q->owner;
|
||||||
|
+ break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
wake_up_process(q->task);
|
||||||
|
@@ -271,6 +284,28 @@ static void try_wake_any_sem(struct ntsync_obj *sem)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
+static void try_wake_any_mutex(struct ntsync_obj *mutex)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_q_entry *entry;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ list_for_each_entry(entry, &mutex->any_waiters, node) {
|
||||||
|
+ struct ntsync_q *q = entry->q;
|
||||||
|
+
|
||||||
|
+ if (mutex->u.mutex.count == UINT_MAX)
|
||||||
|
+ break;
|
||||||
|
+ if (mutex->u.mutex.owner && mutex->u.mutex.owner != q->owner)
|
||||||
|
+ continue;
|
||||||
|
+
|
||||||
|
+ if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
|
||||||
|
+ mutex->u.mutex.count++;
|
||||||
|
+ mutex->u.mutex.owner = q->owner;
|
||||||
|
+ wake_up_process(q->task);
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
{
|
||||||
|
struct ntsync_sem_args __user *user_args = argp;
|
||||||
|
@@ -303,6 +338,38 @@ static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return put_user(id, &user_args->sem);
|
||||||
|
}
|
||||||
|
|
||||||
|
+static int ntsync_create_mutex(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_mutex_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_mutex_args args;
|
||||||
|
+ struct ntsync_obj *mutex;
|
||||||
|
+ __u32 id;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ if (!args.owner != !args.count)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ mutex = kzalloc(sizeof(*mutex), GFP_KERNEL);
|
||||||
|
+ if (!mutex)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+
|
||||||
|
+ init_obj(mutex);
|
||||||
|
+ mutex->type = NTSYNC_TYPE_MUTEX;
|
||||||
|
+ mutex->u.mutex.count = args.count;
|
||||||
|
+ mutex->u.mutex.owner = args.owner;
|
||||||
|
+
|
||||||
|
+ ret = xa_alloc(&dev->objects, &id, mutex, xa_limit_32b, GFP_KERNEL);
|
||||||
|
+ if (ret < 0) {
|
||||||
|
+ kfree(mutex);
|
||||||
|
+ return ret;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return put_user(id, &user_args->mutex);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_delete(struct ntsync_device *dev, void __user *argp)
|
||||||
|
{
|
||||||
|
struct ntsync_obj *obj;
|
||||||
|
@@ -497,6 +564,9 @@ static void try_wake_any_obj(struct ntsync_obj *obj)
|
||||||
|
case NTSYNC_TYPE_SEM:
|
||||||
|
try_wake_any_sem(obj);
|
||||||
|
break;
|
||||||
|
+ case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ try_wake_any_mutex(obj);
|
||||||
|
+ break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@@ -662,6 +732,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
void __user *argp = (void __user *)parm;
|
||||||
|
|
||||||
|
switch (cmd) {
|
||||||
|
+ case NTSYNC_IOC_CREATE_MUTEX:
|
||||||
|
+ return ntsync_create_mutex(dev, argp);
|
||||||
|
case NTSYNC_IOC_CREATE_SEM:
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index a5bed5a39b21..26d1b3d4847f 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -16,6 +16,12 @@ struct ntsync_sem_args {
|
||||||
|
__u32 max;
|
||||||
|
};
|
||||||
|
|
||||||
|
+struct ntsync_mutex_args {
|
||||||
|
+ __u32 mutex;
|
||||||
|
+ __u32 owner;
|
||||||
|
+ __u32 count;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
struct ntsync_wait_args {
|
||||||
|
__u64 timeout;
|
||||||
|
__u64 objs;
|
||||||
|
@@ -38,5 +44,7 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
#define NTSYNC_IOC_WAIT_ALL _IOWR(NTSYNC_IOC_BASE, 4, \
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
+#define NTSYNC_IOC_CREATE_MUTEX _IOWR(NTSYNC_IOC_BASE, 5, \
|
||||||
|
+ struct ntsync_mutex_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,107 @@
|
||||||
|
This corresponds to the NT syscall NtReleaseMutant().
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 67 +++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 2 ++
|
||||||
|
2 files changed, 69 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index d48f2ef41341..28f43768d1c3 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -449,6 +449,71 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+/*
|
||||||
|
+ * Actually change the mutex state, returning -EPERM if not the owner.
|
||||||
|
+ */
|
||||||
|
+static int put_mutex_state(struct ntsync_obj *mutex,
|
||||||
|
+ const struct ntsync_mutex_args *args)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ if (mutex->u.mutex.owner != args->owner)
|
||||||
|
+ return -EPERM;
|
||||||
|
+
|
||||||
|
+ if (!--mutex->u.mutex.count)
|
||||||
|
+ mutex->u.mutex.owner = 0;
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_put_mutex(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_mutex_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_mutex_args args;
|
||||||
|
+ struct ntsync_obj *mutex;
|
||||||
|
+ __u32 prev_count;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ if (!args.owner)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ mutex = get_obj_typed(dev, args.mutex, NTSYNC_TYPE_MUTEX);
|
||||||
|
+ if (!mutex)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ if (atomic_read(&mutex->all_hint) > 0) {
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+ spin_lock_nest_lock(&mutex->lock, &dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ prev_count = mutex->u.mutex.count;
|
||||||
|
+ ret = put_mutex_state(mutex, &args);
|
||||||
|
+ if (!ret) {
|
||||||
|
+ try_wake_all_obj(dev, mutex);
|
||||||
|
+ try_wake_any_mutex(mutex);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&mutex->lock);
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+ } else {
|
||||||
|
+ spin_lock(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ prev_count = mutex->u.mutex.count;
|
||||||
|
+ ret = put_mutex_state(mutex, &args);
|
||||||
|
+ if (!ret)
|
||||||
|
+ try_wake_any_mutex(mutex);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&mutex->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ put_obj(mutex);
|
||||||
|
+
|
||||||
|
+ if (!ret && put_user(prev_count, &user_args->count))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
{
|
||||||
|
int ret = 0;
|
||||||
|
@@ -738,6 +803,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_PUT_MUTEX:
|
||||||
|
+ return ntsync_put_mutex(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
return ntsync_put_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_WAIT_ALL:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 26d1b3d4847f..2e44e7e77776 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -46,5 +46,7 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
#define NTSYNC_IOC_CREATE_MUTEX _IOWR(NTSYNC_IOC_BASE, 5, \
|
||||||
|
struct ntsync_mutex_args)
|
||||||
|
+#define NTSYNC_IOC_PUT_MUTEX _IOWR(NTSYNC_IOC_BASE, 6, \
|
||||||
|
+ struct ntsync_mutex_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,170 @@
|
||||||
|
This does not correspond to any NT syscall, but rather should be called by the
|
||||||
|
user-space NT emulator when a thread dies. It is responsible for marking any
|
||||||
|
mutexes owned by that thread as abandoned.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 80 ++++++++++++++++++++++++++++++++++++-
|
||||||
|
include/uapi/linux/ntsync.h | 1 +
|
||||||
|
2 files changed, 79 insertions(+), 2 deletions(-)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 28f43768d1c3..1173c750c106 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -64,6 +64,7 @@ struct ntsync_obj {
|
||||||
|
struct {
|
||||||
|
__u32 count;
|
||||||
|
__u32 owner;
|
||||||
|
+ bool ownerdead;
|
||||||
|
} mutex;
|
||||||
|
} u;
|
||||||
|
};
|
||||||
|
@@ -87,6 +88,7 @@ struct ntsync_q {
|
||||||
|
atomic_t signaled;
|
||||||
|
|
||||||
|
bool all;
|
||||||
|
+ bool ownerdead;
|
||||||
|
__u32 count;
|
||||||
|
struct ntsync_q_entry entries[];
|
||||||
|
};
|
||||||
|
@@ -240,6 +242,9 @@ static void try_wake_all(struct ntsync_device *dev, struct ntsync_q *q,
|
||||||
|
obj->u.sem.count--;
|
||||||
|
break;
|
||||||
|
case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ if (obj->u.mutex.ownerdead)
|
||||||
|
+ q->ownerdead = true;
|
||||||
|
+ obj->u.mutex.ownerdead = false;
|
||||||
|
obj->u.mutex.count++;
|
||||||
|
obj->u.mutex.owner = q->owner;
|
||||||
|
break;
|
||||||
|
@@ -299,6 +304,9 @@ static void try_wake_any_mutex(struct ntsync_obj *mutex)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
|
||||||
|
+ if (mutex->u.mutex.ownerdead)
|
||||||
|
+ q->ownerdead = true;
|
||||||
|
+ mutex->u.mutex.ownerdead = false;
|
||||||
|
mutex->u.mutex.count++;
|
||||||
|
mutex->u.mutex.owner = q->owner;
|
||||||
|
wake_up_process(q->task);
|
||||||
|
@@ -514,6 +522,71 @@ static int ntsync_put_mutex(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+/*
|
||||||
|
+ * Actually change the mutex state to mark its owner as dead.
|
||||||
|
+ */
|
||||||
|
+static void put_mutex_ownerdead_state(struct ntsync_obj *mutex)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ mutex->u.mutex.ownerdead = true;
|
||||||
|
+ mutex->u.mutex.owner = 0;
|
||||||
|
+ mutex->u.mutex.count = 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_kill_owner(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ unsigned long id;
|
||||||
|
+ __u32 owner;
|
||||||
|
+
|
||||||
|
+ if (get_user(owner, (__u32 __user *)argp))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ if (!owner)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ rcu_read_lock();
|
||||||
|
+
|
||||||
|
+ xa_for_each(&dev->objects, id, obj) {
|
||||||
|
+ if (!kref_get_unless_zero(&obj->refcount))
|
||||||
|
+ continue;
|
||||||
|
+
|
||||||
|
+ if (obj->type != NTSYNC_TYPE_MUTEX) {
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ continue;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (atomic_read(&obj->all_hint) > 0) {
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+ spin_lock_nest_lock(&obj->lock, &dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ if (obj->u.mutex.owner == owner) {
|
||||||
|
+ put_mutex_ownerdead_state(obj);
|
||||||
|
+ try_wake_all_obj(dev, obj);
|
||||||
|
+ try_wake_any_mutex(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+ } else {
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+
|
||||||
|
+ if (obj->u.mutex.owner == owner) {
|
||||||
|
+ put_mutex_ownerdead_state(obj);
|
||||||
|
+ try_wake_any_mutex(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ rcu_read_unlock();
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
{
|
||||||
|
int ret = 0;
|
||||||
|
@@ -585,6 +658,7 @@ static int setup_wait(struct ntsync_device *dev,
|
||||||
|
q->owner = args->owner;
|
||||||
|
atomic_set(&q->signaled, -1);
|
||||||
|
q->all = all;
|
||||||
|
+ q->ownerdead = false;
|
||||||
|
q->count = count;
|
||||||
|
|
||||||
|
for (i = 0; i < count; i++) {
|
||||||
|
@@ -697,7 +771,7 @@ static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
|
||||||
|
/* even if we caught a signal, we need to communicate success */
|
||||||
|
- ret = 0;
|
||||||
|
+ ret = q->ownerdead ? -EOWNERDEAD : 0;
|
||||||
|
|
||||||
|
if (put_user(signaled, &user_args->index))
|
||||||
|
ret = -EFAULT;
|
||||||
|
@@ -778,7 +852,7 @@ static int ntsync_wait_all(struct ntsync_device *dev, void __user *argp)
|
||||||
|
struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
|
||||||
|
/* even if we caught a signal, we need to communicate success */
|
||||||
|
- ret = 0;
|
||||||
|
+ ret = q->ownerdead ? -EOWNERDEAD : 0;
|
||||||
|
|
||||||
|
if (put_user(signaled, &user_args->index))
|
||||||
|
ret = -EFAULT;
|
||||||
|
@@ -803,6 +877,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_KILL_OWNER:
|
||||||
|
+ return ntsync_kill_owner(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_MUTEX:
|
||||||
|
return ntsync_put_mutex(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 2e44e7e77776..fec9a3993322 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -48,5 +48,6 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_mutex_args)
|
||||||
|
#define NTSYNC_IOC_PUT_MUTEX _IOWR(NTSYNC_IOC_BASE, 6, \
|
||||||
|
struct ntsync_mutex_args)
|
||||||
|
+#define NTSYNC_IOC_KILL_OWNER _IOW (NTSYNC_IOC_BASE, 7, __u32)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -1,6 +1,6 @@
|
||||||
pkgname=linux6.7-zen
|
pkgname=linux6.7-zen
|
||||||
version=6.7.1
|
version=6.7.1
|
||||||
revision=1
|
revision=2
|
||||||
zen=1
|
zen=1
|
||||||
wrksrc="linux-${version}-zen${zen}"
|
wrksrc="linux-${version}-zen${zen}"
|
||||||
short_desc="Linux kernel and modules with Zen patches (${version%.*} series) compiled with Clang"
|
short_desc="Linux kernel and modules with Zen patches (${version%.*} series) compiled with Clang"
|
||||||
|
|
|
@ -0,0 +1,106 @@
|
||||||
|
ntsync uses a misc device as the simplest and least intrusive uAPI interface.
|
||||||
|
|
||||||
|
Each file description on the device represents an isolated NT instance, intended
|
||||||
|
to correspond to a single NT virtual machine.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/Kconfig | 9 ++++++++
|
||||||
|
drivers/misc/Makefile | 1 +
|
||||||
|
drivers/misc/ntsync.c | 53 +++++++++++++++++++++++++++++++++++++++++++
|
||||||
|
3 files changed, 63 insertions(+)
|
||||||
|
create mode 100644 drivers/misc/ntsync.c
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
|
||||||
|
index 4fb291f0bf7c..bdd8a71bd853 100644
|
||||||
|
--- a/drivers/misc/Kconfig
|
||||||
|
+++ b/drivers/misc/Kconfig
|
||||||
|
@@ -504,6 +504,15 @@ config OPEN_DICE
|
||||||
|
measured boot flow. Userspace can use CDIs for remote attestation
|
||||||
|
and sealing.
|
||||||
|
|
||||||
|
+config NTSYNC
|
||||||
|
+ tristate "NT synchronization primitive emulation"
|
||||||
|
+ help
|
||||||
|
+ This module provides kernel support for emulation of Windows NT
|
||||||
|
+ synchronization primitives. It is not a hardware driver.
|
||||||
|
+
|
||||||
|
+ To compile this driver as a module, choose M here: the
|
||||||
|
+ module will be called ntsync.
|
||||||
|
+
|
||||||
|
If unsure, say N.
|
||||||
|
|
||||||
|
config VCPU_STALL_DETECTOR
|
||||||
|
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
|
||||||
|
index ea6ea5bbbc9c..153a3f4837e8 100644
|
||||||
|
--- a/drivers/misc/Makefile
|
||||||
|
+++ b/drivers/misc/Makefile
|
||||||
|
@@ -59,6 +59,7 @@ obj-$(CONFIG_PVPANIC) += pvpanic/
|
||||||
|
obj-$(CONFIG_UACCE) += uacce/
|
||||||
|
obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o
|
||||||
|
obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o
|
||||||
|
+obj-$(CONFIG_NTSYNC) += ntsync.o
|
||||||
|
obj-$(CONFIG_HI6421V600_IRQ) += hi6421v600-irq.o
|
||||||
|
obj-$(CONFIG_OPEN_DICE) += open-dice.o
|
||||||
|
obj-$(CONFIG_GP_PCI1XXXX) += mchp_pci1xxxx/
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
new file mode 100644
|
||||||
|
index 000000000000..9424c6210e51
|
||||||
|
--- /dev/null
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -0,0 +1,53 @@
|
||||||
|
+// SPDX-License-Identifier: GPL-2.0-only
|
||||||
|
+/*
|
||||||
|
+ * ntsync.c - Kernel driver for NT synchronization primitives
|
||||||
|
+ *
|
||||||
|
+ * Copyright (C) 2021-2022 Elizabeth Figura
|
||||||
|
+ */
|
||||||
|
+
|
||||||
|
+#include <linux/fs.h>
|
||||||
|
+#include <linux/miscdevice.h>
|
||||||
|
+#include <linux/module.h>
|
||||||
|
+
|
||||||
|
+#define NTSYNC_NAME "ntsync"
|
||||||
|
+
|
||||||
|
+static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
+{
|
||||||
|
+ return nonseekable_open(inode, file);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
+{
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
+ unsigned long parm)
|
||||||
|
+{
|
||||||
|
+ switch (cmd) {
|
||||||
|
+ default:
|
||||||
|
+ return -ENOIOCTLCMD;
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static const struct file_operations ntsync_fops = {
|
||||||
|
+ .owner = THIS_MODULE,
|
||||||
|
+ .open = ntsync_char_open,
|
||||||
|
+ .release = ntsync_char_release,
|
||||||
|
+ .unlocked_ioctl = ntsync_char_ioctl,
|
||||||
|
+ .compat_ioctl = ntsync_char_ioctl,
|
||||||
|
+ .llseek = no_llseek,
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+static struct miscdevice ntsync_misc = {
|
||||||
|
+ .minor = MISC_DYNAMIC_MINOR,
|
||||||
|
+ .name = NTSYNC_NAME,
|
||||||
|
+ .fops = &ntsync_fops,
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+module_misc_device(ntsync_misc);
|
||||||
|
+
|
||||||
|
+MODULE_AUTHOR("Elizabeth Figura");
|
||||||
|
+MODULE_DESCRIPTION("Kernel driver for NT synchronization primitives");
|
||||||
|
+MODULE_LICENSE("GPL");
|
||||||
|
+MODULE_ALIAS("devname:" NTSYNC_NAME);
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,68 @@
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
Documentation/admin-guide/devices.txt | 3 ++-
|
||||||
|
Documentation/userspace-api/ioctl/ioctl-number.rst | 2 ++
|
||||||
|
drivers/misc/ntsync.c | 3 ++-
|
||||||
|
include/linux/miscdevice.h | 1 +
|
||||||
|
4 files changed, 7 insertions(+), 2 deletions(-)
|
||||||
|
|
||||||
|
diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
|
||||||
|
index 94c98be1329a..041404397ee5 100644
|
||||||
|
--- a/Documentation/admin-guide/devices.txt
|
||||||
|
+++ b/Documentation/admin-guide/devices.txt
|
||||||
|
@@ -376,8 +376,9 @@
|
||||||
|
240 = /dev/userio Serio driver testing device
|
||||||
|
241 = /dev/vhost-vsock Host kernel driver for virtio vsock
|
||||||
|
242 = /dev/rfkill Turning off radio transmissions (rfkill)
|
||||||
|
+ 243 = /dev/ntsync NT synchronization primitive device
|
||||||
|
|
||||||
|
- 243-254 Reserved for local use
|
||||||
|
+ 244-254 Reserved for local use
|
||||||
|
255 Reserved for MISC_DYNAMIC_MINOR
|
||||||
|
|
||||||
|
11 char Raw keyboard device (Linux/SPARC only)
|
||||||
|
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
|
||||||
|
index 457e16f06e04..a1326a5bc2e0 100644
|
||||||
|
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
|
||||||
|
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
|
||||||
|
@@ -378,6 +378,8 @@ Code Seq# Include File Comments
|
||||||
|
<mailto:thomas@winischhofer.net>
|
||||||
|
0xF6 all LTTng Linux Trace Toolkit Next Generation
|
||||||
|
<mailto:mathieu.desnoyers@efficios.com>
|
||||||
|
+0xF7 00-1F uapi/linux/ntsync.h NT synchronization primitives
|
||||||
|
+ <mailto:wine-devel@winehq.org>
|
||||||
|
0xF8 all arch/x86/include/uapi/asm/amd_hsmp.h AMD HSMP EPYC system management interface driver
|
||||||
|
<mailto:nchatrad@amd.com>
|
||||||
|
0xFD all linux/dm-ioctl.h
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 9424c6210e51..84b498e2b2d5 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -40,7 +40,7 @@ static const struct file_operations ntsync_fops = {
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct miscdevice ntsync_misc = {
|
||||||
|
- .minor = MISC_DYNAMIC_MINOR,
|
||||||
|
+ .minor = NTSYNC_MINOR,
|
||||||
|
.name = NTSYNC_NAME,
|
||||||
|
.fops = &ntsync_fops,
|
||||||
|
};
|
||||||
|
@@ -51,3 +51,4 @@ MODULE_AUTHOR("Elizabeth Figura");
|
||||||
|
MODULE_DESCRIPTION("Kernel driver for NT synchronization primitives");
|
||||||
|
MODULE_LICENSE("GPL");
|
||||||
|
MODULE_ALIAS("devname:" NTSYNC_NAME);
|
||||||
|
+MODULE_ALIAS_MISCDEV(NTSYNC_MINOR);
|
||||||
|
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
|
||||||
|
index c0fea6ca5076..fe5d9366fdf7 100644
|
||||||
|
--- a/include/linux/miscdevice.h
|
||||||
|
+++ b/include/linux/miscdevice.h
|
||||||
|
@@ -71,6 +71,7 @@
|
||||||
|
#define USERIO_MINOR 240
|
||||||
|
#define VHOST_VSOCK_MINOR 241
|
||||||
|
#define RFKILL_MINOR 242
|
||||||
|
+#define NTSYNC_MINOR 243
|
||||||
|
#define MISC_DYNAMIC_MINOR 255
|
||||||
|
|
||||||
|
struct device;
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,191 @@
|
||||||
|
These correspond to the NT syscalls NtCreateSemaphore() and NtClose().
|
||||||
|
Unlike those functions, however, these ioctls do not handle object names, or
|
||||||
|
lookup of existing objects, or handle reference counting, but simply create the
|
||||||
|
underlying primitive. The user space emulator is expected to implement those
|
||||||
|
functions if they are required.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 117 ++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 25 ++++++++
|
||||||
|
2 files changed, 142 insertions(+)
|
||||||
|
create mode 100644 include/uapi/linux/ntsync.h
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 84b498e2b2d5..3287b94be351 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -8,23 +8,140 @@
|
||||||
|
#include <linux/fs.h>
|
||||||
|
#include <linux/miscdevice.h>
|
||||||
|
#include <linux/module.h>
|
||||||
|
+#include <linux/slab.h>
|
||||||
|
+#include <linux/xarray.h>
|
||||||
|
+#include <uapi/linux/ntsync.h>
|
||||||
|
|
||||||
|
#define NTSYNC_NAME "ntsync"
|
||||||
|
|
||||||
|
+enum ntsync_type {
|
||||||
|
+ NTSYNC_TYPE_SEM,
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+struct ntsync_obj {
|
||||||
|
+ struct rcu_head rhead;
|
||||||
|
+ struct kref refcount;
|
||||||
|
+
|
||||||
|
+ enum ntsync_type type;
|
||||||
|
+
|
||||||
|
+ union {
|
||||||
|
+ struct {
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 max;
|
||||||
|
+ } sem;
|
||||||
|
+ } u;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+struct ntsync_device {
|
||||||
|
+ struct xarray objects;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+static void destroy_obj(struct kref *ref)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj = container_of(ref, struct ntsync_obj, refcount);
|
||||||
|
+
|
||||||
|
+ kfree_rcu(obj, rhead);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void put_obj(struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ kref_put(&obj->refcount, destroy_obj);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
{
|
||||||
|
+ struct ntsync_device *dev;
|
||||||
|
+
|
||||||
|
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
||||||
|
+ if (!dev)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+
|
||||||
|
+ xa_init_flags(&dev->objects, XA_FLAGS_ALLOC);
|
||||||
|
+
|
||||||
|
+ file->private_data = dev;
|
||||||
|
return nonseekable_open(inode, file);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
{
|
||||||
|
+ struct ntsync_device *dev = file->private_data;
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ unsigned long id;
|
||||||
|
+
|
||||||
|
+ xa_for_each(&dev->objects, id, obj)
|
||||||
|
+ put_obj(obj);
|
||||||
|
+
|
||||||
|
+ xa_destroy(&dev->objects);
|
||||||
|
+
|
||||||
|
+ kfree(dev);
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void init_obj(struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ kref_init(&obj->refcount);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_sem_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_sem_args args;
|
||||||
|
+ struct ntsync_obj *sem;
|
||||||
|
+ __u32 id;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ if (args.count > args.max)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ sem = kzalloc(sizeof(*sem), GFP_KERNEL);
|
||||||
|
+ if (!sem)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+
|
||||||
|
+ init_obj(sem);
|
||||||
|
+ sem->type = NTSYNC_TYPE_SEM;
|
||||||
|
+ sem->u.sem.count = args.count;
|
||||||
|
+ sem->u.sem.max = args.max;
|
||||||
|
+
|
||||||
|
+ ret = xa_alloc(&dev->objects, &id, sem, xa_limit_32b, GFP_KERNEL);
|
||||||
|
+ if (ret < 0) {
|
||||||
|
+ kfree(sem);
|
||||||
|
+ return ret;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return put_user(id, &user_args->sem);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_delete(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ __u32 id;
|
||||||
|
+
|
||||||
|
+ if (get_user(id, (__u32 __user *)argp))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ obj = xa_erase(&dev->objects, id);
|
||||||
|
+ if (!obj)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
+ struct ntsync_device *dev = file->private_data;
|
||||||
|
+ void __user *argp = (void __user *)parm;
|
||||||
|
+
|
||||||
|
switch (cmd) {
|
||||||
|
+ case NTSYNC_IOC_CREATE_SEM:
|
||||||
|
+ return ntsync_create_sem(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_DELETE:
|
||||||
|
+ return ntsync_delete(dev, argp);
|
||||||
|
default:
|
||||||
|
return -ENOIOCTLCMD;
|
||||||
|
}
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
new file mode 100644
|
||||||
|
index 000000000000..d97afc138dcc
|
||||||
|
--- /dev/null
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -0,0 +1,25 @@
|
||||||
|
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
||||||
|
+/*
|
||||||
|
+ * Kernel support for NT synchronization primitive emulation
|
||||||
|
+ *
|
||||||
|
+ * Copyright (C) 2021-2022 Elizabeth Figura
|
||||||
|
+ */
|
||||||
|
+
|
||||||
|
+#ifndef __LINUX_NTSYNC_H
|
||||||
|
+#define __LINUX_NTSYNC_H
|
||||||
|
+
|
||||||
|
+#include <linux/types.h>
|
||||||
|
+
|
||||||
|
+struct ntsync_sem_args {
|
||||||
|
+ __u32 sem;
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 max;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+#define NTSYNC_IOC_BASE 0xf7
|
||||||
|
+
|
||||||
|
+#define NTSYNC_IOC_CREATE_SEM _IOWR(NTSYNC_IOC_BASE, 0, \
|
||||||
|
+ struct ntsync_sem_args)
|
||||||
|
+#define NTSYNC_IOC_DELETE _IOW (NTSYNC_IOC_BASE, 1, __u32)
|
||||||
|
+
|
||||||
|
+#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,147 @@
|
||||||
|
This corresponds to the NT syscall NtReleaseSemaphore().
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 76 +++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 2 +
|
||||||
|
2 files changed, 78 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 3287b94be351..d1c91c2a4f1a 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -21,9 +21,11 @@ enum ntsync_type {
|
||||||
|
struct ntsync_obj {
|
||||||
|
struct rcu_head rhead;
|
||||||
|
struct kref refcount;
|
||||||
|
+ spinlock_t lock;
|
||||||
|
|
||||||
|
enum ntsync_type type;
|
||||||
|
|
||||||
|
+ /* The following fields are protected by the object lock. */
|
||||||
|
union {
|
||||||
|
struct {
|
||||||
|
__u32 count;
|
||||||
|
@@ -36,6 +38,19 @@ struct ntsync_device {
|
||||||
|
struct xarray objects;
|
||||||
|
};
|
||||||
|
|
||||||
|
+static struct ntsync_obj *get_obj(struct ntsync_device *dev, __u32 id)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+
|
||||||
|
+ rcu_read_lock();
|
||||||
|
+ obj = xa_load(&dev->objects, id);
|
||||||
|
+ if (obj && !kref_get_unless_zero(&obj->refcount))
|
||||||
|
+ obj = NULL;
|
||||||
|
+ rcu_read_unlock();
|
||||||
|
+
|
||||||
|
+ return obj;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static void destroy_obj(struct kref *ref)
|
||||||
|
{
|
||||||
|
struct ntsync_obj *obj = container_of(ref, struct ntsync_obj, refcount);
|
||||||
|
@@ -48,6 +63,18 @@ static void put_obj(struct ntsync_obj *obj)
|
||||||
|
kref_put(&obj->refcount, destroy_obj);
|
||||||
|
}
|
||||||
|
|
||||||
|
+static struct ntsync_obj *get_obj_typed(struct ntsync_device *dev, __u32 id,
|
||||||
|
+ enum ntsync_type type)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj = get_obj(dev, id);
|
||||||
|
+
|
||||||
|
+ if (obj && obj->type != type) {
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ return NULL;
|
||||||
|
+ }
|
||||||
|
+ return obj;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
{
|
||||||
|
struct ntsync_device *dev;
|
||||||
|
@@ -81,6 +108,7 @@ static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
static void init_obj(struct ntsync_obj *obj)
|
||||||
|
{
|
||||||
|
kref_init(&obj->refcount);
|
||||||
|
+ spin_lock_init(&obj->lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
@@ -131,6 +159,52 @@ static int ntsync_delete(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
+/*
|
||||||
|
+ * Actually change the semaphore state, returning -EOVERFLOW if it is made
|
||||||
|
+ * invalid.
|
||||||
|
+ */
|
||||||
|
+static int put_sem_state(struct ntsync_obj *sem, __u32 count)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&sem->lock);
|
||||||
|
+
|
||||||
|
+ if (sem->u.sem.count + count < sem->u.sem.count ||
|
||||||
|
+ sem->u.sem.count + count > sem->u.sem.max)
|
||||||
|
+ return -EOVERFLOW;
|
||||||
|
+
|
||||||
|
+ sem->u.sem.count += count;
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_sem_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_sem_args args;
|
||||||
|
+ struct ntsync_obj *sem;
|
||||||
|
+ __u32 prev_count;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ sem = get_obj_typed(dev, args.sem, NTSYNC_TYPE_SEM);
|
||||||
|
+ if (!sem)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ spin_lock(&sem->lock);
|
||||||
|
+
|
||||||
|
+ prev_count = sem->u.sem.count;
|
||||||
|
+ ret = put_sem_state(sem, args.count);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&sem->lock);
|
||||||
|
+
|
||||||
|
+ put_obj(sem);
|
||||||
|
+
|
||||||
|
+ if (!ret && put_user(prev_count, &user_args->count))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
@@ -142,6 +216,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_PUT_SEM:
|
||||||
|
+ return ntsync_put_sem(dev, argp);
|
||||||
|
default:
|
||||||
|
return -ENOIOCTLCMD;
|
||||||
|
}
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index d97afc138dcc..8c610d65f8ef 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -21,5 +21,7 @@ struct ntsync_sem_args {
|
||||||
|
#define NTSYNC_IOC_CREATE_SEM _IOWR(NTSYNC_IOC_BASE, 0, \
|
||||||
|
struct ntsync_sem_args)
|
||||||
|
#define NTSYNC_IOC_DELETE _IOW (NTSYNC_IOC_BASE, 1, __u32)
|
||||||
|
+#define NTSYNC_IOC_PUT_SEM _IOWR(NTSYNC_IOC_BASE, 2, \
|
||||||
|
+ struct ntsync_sem_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,318 @@
|
||||||
|
This corresponds to part of the functionality of the NT syscall
|
||||||
|
NtWaitForMultipleObjects(). Specifically, it implements the behaviour where
|
||||||
|
the third argument (wait_any) is TRUE, and it does not handle alertable waits.
|
||||||
|
Those features have been split out into separate patches to ease review.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 229 ++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 13 ++
|
||||||
|
2 files changed, 242 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index d1c91c2a4f1a..2e8d3c2d51a4 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -23,6 +23,8 @@ struct ntsync_obj {
|
||||||
|
struct kref refcount;
|
||||||
|
spinlock_t lock;
|
||||||
|
|
||||||
|
+ struct list_head any_waiters;
|
||||||
|
+
|
||||||
|
enum ntsync_type type;
|
||||||
|
|
||||||
|
/* The following fields are protected by the object lock. */
|
||||||
|
@@ -34,6 +36,28 @@ struct ntsync_obj {
|
||||||
|
} u;
|
||||||
|
};
|
||||||
|
|
||||||
|
+struct ntsync_q_entry {
|
||||||
|
+ struct list_head node;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ __u32 index;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+struct ntsync_q {
|
||||||
|
+ struct task_struct *task;
|
||||||
|
+ __u32 owner;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * Protected via atomic_cmpxchg(). Only the thread that wins the
|
||||||
|
+ * compare-and-swap may actually change object states and wake this
|
||||||
|
+ * task.
|
||||||
|
+ */
|
||||||
|
+ atomic_t signaled;
|
||||||
|
+
|
||||||
|
+ __u32 count;
|
||||||
|
+ struct ntsync_q_entry entries[];
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
struct ntsync_device {
|
||||||
|
struct xarray objects;
|
||||||
|
};
|
||||||
|
@@ -109,6 +133,26 @@ static void init_obj(struct ntsync_obj *obj)
|
||||||
|
{
|
||||||
|
kref_init(&obj->refcount);
|
||||||
|
spin_lock_init(&obj->lock);
|
||||||
|
+ INIT_LIST_HEAD(&obj->any_waiters);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void try_wake_any_sem(struct ntsync_obj *sem)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_q_entry *entry;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&sem->lock);
|
||||||
|
+
|
||||||
|
+ list_for_each_entry(entry, &sem->any_waiters, node) {
|
||||||
|
+ struct ntsync_q *q = entry->q;
|
||||||
|
+
|
||||||
|
+ if (!sem->u.sem.count)
|
||||||
|
+ break;
|
||||||
|
+
|
||||||
|
+ if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
|
||||||
|
+ sem->u.sem.count--;
|
||||||
|
+ wake_up_process(q->task);
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
}
|
||||||
|
|
||||||
|
static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
@@ -194,6 +238,8 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
|
||||||
|
prev_count = sem->u.sem.count;
|
||||||
|
ret = put_sem_state(sem, args.count);
|
||||||
|
+ if (!ret)
|
||||||
|
+ try_wake_any_sem(sem);
|
||||||
|
|
||||||
|
spin_unlock(&sem->lock);
|
||||||
|
|
||||||
|
@@ -205,6 +251,187 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
+{
|
||||||
|
+ int ret = 0;
|
||||||
|
+
|
||||||
|
+ do {
|
||||||
|
+ if (signal_pending(current)) {
|
||||||
|
+ ret = -ERESTARTSYS;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ set_current_state(TASK_INTERRUPTIBLE);
|
||||||
|
+ if (atomic_read(&q->signaled) != -1) {
|
||||||
|
+ ret = 0;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+ ret = schedule_hrtimeout(timeout, HRTIMER_MODE_ABS);
|
||||||
|
+ } while (ret < 0);
|
||||||
|
+ __set_current_state(TASK_RUNNING);
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+/*
|
||||||
|
+ * Allocate and initialize the ntsync_q structure, but do not queue us yet.
|
||||||
|
+ * Also, calculate the relative timeout.
|
||||||
|
+ */
|
||||||
|
+static int setup_wait(struct ntsync_device *dev,
|
||||||
|
+ const struct ntsync_wait_args *args,
|
||||||
|
+ ktime_t *ret_timeout, struct ntsync_q **ret_q)
|
||||||
|
+{
|
||||||
|
+ const __u32 count = args->count;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ ktime_t timeout = 0;
|
||||||
|
+ __u32 *ids;
|
||||||
|
+ __u32 i, j;
|
||||||
|
+
|
||||||
|
+ if (!args->owner || args->pad)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ if (args->count > NTSYNC_MAX_WAIT_COUNT)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ if (args->timeout) {
|
||||||
|
+ struct timespec64 to;
|
||||||
|
+
|
||||||
|
+ if (get_timespec64(&to, u64_to_user_ptr(args->timeout)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ if (!timespec64_valid(&to))
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ timeout = timespec64_to_ns(&to);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ ids = kmalloc_array(count, sizeof(*ids), GFP_KERNEL);
|
||||||
|
+ if (!ids)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+ if (copy_from_user(ids, u64_to_user_ptr(args->objs),
|
||||||
|
+ array_size(count, sizeof(*ids)))) {
|
||||||
|
+ kfree(ids);
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ q = kmalloc(struct_size(q, entries, count), GFP_KERNEL);
|
||||||
|
+ if (!q) {
|
||||||
|
+ kfree(ids);
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+ }
|
||||||
|
+ q->task = current;
|
||||||
|
+ q->owner = args->owner;
|
||||||
|
+ atomic_set(&q->signaled, -1);
|
||||||
|
+ q->count = count;
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = get_obj(dev, ids[i]);
|
||||||
|
+
|
||||||
|
+ if (!obj)
|
||||||
|
+ goto err;
|
||||||
|
+
|
||||||
|
+ entry->obj = obj;
|
||||||
|
+ entry->q = q;
|
||||||
|
+ entry->index = i;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ kfree(ids);
|
||||||
|
+
|
||||||
|
+ *ret_q = q;
|
||||||
|
+ *ret_timeout = timeout;
|
||||||
|
+ return 0;
|
||||||
|
+
|
||||||
|
+err:
|
||||||
|
+ for (j = 0; j < i; j++)
|
||||||
|
+ put_obj(q->entries[j].obj);
|
||||||
|
+ kfree(ids);
|
||||||
|
+ kfree(q);
|
||||||
|
+ return -EINVAL;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void try_wake_any_obj(struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ switch (obj->type) {
|
||||||
|
+ case NTSYNC_TYPE_SEM:
|
||||||
|
+ try_wake_any_sem(obj);
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_wait_args args;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ ktime_t timeout;
|
||||||
|
+ int signaled;
|
||||||
|
+ __u32 i;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ ret = setup_wait(dev, &args, &timeout, &q);
|
||||||
|
+ if (ret < 0)
|
||||||
|
+ return ret;
|
||||||
|
+
|
||||||
|
+ /* queue ourselves */
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+ list_add_tail(&entry->node, &obj->any_waiters);
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* check if we are already signaled */
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_obj *obj = q->entries[i].obj;
|
||||||
|
+
|
||||||
|
+ if (atomic_read(&q->signaled) != -1)
|
||||||
|
+ break;
|
||||||
|
+
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+ try_wake_any_obj(obj);
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* sleep */
|
||||||
|
+
|
||||||
|
+ ret = ntsync_schedule(q, args.timeout ? &timeout : NULL);
|
||||||
|
+
|
||||||
|
+ /* and finally, unqueue */
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+ list_del(&entry->node);
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ signaled = atomic_read(&q->signaled);
|
||||||
|
+ if (signaled != -1) {
|
||||||
|
+ struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
+
|
||||||
|
+ /* even if we caught a signal, we need to communicate success */
|
||||||
|
+ ret = 0;
|
||||||
|
+
|
||||||
|
+ if (put_user(signaled, &user_args->index))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+ } else if (!ret) {
|
||||||
|
+ ret = -ETIMEDOUT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ kfree(q);
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
@@ -218,6 +445,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
return ntsync_put_sem(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_WAIT_ANY:
|
||||||
|
+ return ntsync_wait_any(dev, argp);
|
||||||
|
default:
|
||||||
|
return -ENOIOCTLCMD;
|
||||||
|
}
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 8c610d65f8ef..10f07da7864e 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -16,6 +16,17 @@ struct ntsync_sem_args {
|
||||||
|
__u32 max;
|
||||||
|
};
|
||||||
|
|
||||||
|
+struct ntsync_wait_args {
|
||||||
|
+ __u64 timeout;
|
||||||
|
+ __u64 objs;
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 owner;
|
||||||
|
+ __u32 index;
|
||||||
|
+ __u32 pad;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
+#define NTSYNC_MAX_WAIT_COUNT 64
|
||||||
|
+
|
||||||
|
#define NTSYNC_IOC_BASE 0xf7
|
||||||
|
|
||||||
|
#define NTSYNC_IOC_CREATE_SEM _IOWR(NTSYNC_IOC_BASE, 0, \
|
||||||
|
@@ -23,5 +34,7 @@ struct ntsync_sem_args {
|
||||||
|
#define NTSYNC_IOC_DELETE _IOW (NTSYNC_IOC_BASE, 1, __u32)
|
||||||
|
#define NTSYNC_IOC_PUT_SEM _IOWR(NTSYNC_IOC_BASE, 2, \
|
||||||
|
struct ntsync_sem_args)
|
||||||
|
+#define NTSYNC_IOC_WAIT_ANY _IOWR(NTSYNC_IOC_BASE, 3, \
|
||||||
|
+ struct ntsync_wait_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,357 @@
|
||||||
|
This corresponds to part of the functionality of the NT syscall
|
||||||
|
NtWaitForMultipleObjects(). Specifically, it implements the behaviour where
|
||||||
|
the third argument (wait_any) is FALSE, and it does not yet handle alertable
|
||||||
|
waits.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 241 ++++++++++++++++++++++++++++++++++--
|
||||||
|
include/uapi/linux/ntsync.h | 2 +
|
||||||
|
2 files changed, 235 insertions(+), 8 deletions(-)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 2e8d3c2d51a4..2685363fae9e 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -23,7 +23,34 @@ struct ntsync_obj {
|
||||||
|
struct kref refcount;
|
||||||
|
spinlock_t lock;
|
||||||
|
|
||||||
|
+ /*
|
||||||
|
+ * any_waiters is protected by the object lock, but all_waiters is
|
||||||
|
+ * protected by the device wait_all_lock.
|
||||||
|
+ */
|
||||||
|
struct list_head any_waiters;
|
||||||
|
+ struct list_head all_waiters;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * Hint describing how many tasks are queued on this object in a
|
||||||
|
+ * wait-all operation.
|
||||||
|
+ *
|
||||||
|
+ * Any time we do a wake, we may need to wake "all" waiters as well as
|
||||||
|
+ * "any" waiters. In order to atomically wake "all" waiters, we must
|
||||||
|
+ * lock all of the objects, and that means grabbing the wait_all_lock
|
||||||
|
+ * below (and, due to lock ordering rules, before locking this object).
|
||||||
|
+ * However, wait-all is a rare operation, and grabbing the wait-all
|
||||||
|
+ * lock for every wake would create unnecessary contention. Therefore we
|
||||||
|
+ * first check whether all_hint is zero, and, if it is, we skip trying
|
||||||
|
+ * to wake "all" waiters.
|
||||||
|
+ *
|
||||||
|
+ * This hint isn't protected by any lock. It might change during the
|
||||||
|
+ * course of a wake, but there's no meaningful race there; it's only a
|
||||||
|
+ * hint.
|
||||||
|
+ *
|
||||||
|
+ * Since wait requests must originate from user-space threads, we're
|
||||||
|
+ * limited here by PID_MAX_LIMIT, so there's no risk of saturation.
|
||||||
|
+ */
|
||||||
|
+ atomic_t all_hint;
|
||||||
|
|
||||||
|
enum ntsync_type type;
|
||||||
|
|
||||||
|
@@ -54,11 +81,25 @@ struct ntsync_q {
|
||||||
|
*/
|
||||||
|
atomic_t signaled;
|
||||||
|
|
||||||
|
+ bool all;
|
||||||
|
__u32 count;
|
||||||
|
struct ntsync_q_entry entries[];
|
||||||
|
};
|
||||||
|
|
||||||
|
struct ntsync_device {
|
||||||
|
+ /*
|
||||||
|
+ * Wait-all operations must atomically grab all objects, and be totally
|
||||||
|
+ * ordered with respect to each other and wait-any operations. If one
|
||||||
|
+ * thread is trying to acquire several objects, another thread cannot
|
||||||
|
+ * touch the object at the same time.
|
||||||
|
+ *
|
||||||
|
+ * We achieve this by grabbing multiple object locks at the same time.
|
||||||
|
+ * However, this creates a lock ordering problem. To solve that problem,
|
||||||
|
+ * wait_all_lock is taken first whenever multiple objects must be locked
|
||||||
|
+ * at the same time.
|
||||||
|
+ */
|
||||||
|
+ spinlock_t wait_all_lock;
|
||||||
|
+
|
||||||
|
struct xarray objects;
|
||||||
|
};
|
||||||
|
|
||||||
|
@@ -107,6 +148,8 @@ static int ntsync_char_open(struct inode *inode, struct file *file)
|
||||||
|
if (!dev)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
+ spin_lock_init(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
xa_init_flags(&dev->objects, XA_FLAGS_ALLOC);
|
||||||
|
|
||||||
|
file->private_data = dev;
|
||||||
|
@@ -132,8 +175,81 @@ static int ntsync_char_release(struct inode *inode, struct file *file)
|
||||||
|
static void init_obj(struct ntsync_obj *obj)
|
||||||
|
{
|
||||||
|
kref_init(&obj->refcount);
|
||||||
|
+ atomic_set(&obj->all_hint, 0);
|
||||||
|
spin_lock_init(&obj->lock);
|
||||||
|
INIT_LIST_HEAD(&obj->any_waiters);
|
||||||
|
+ INIT_LIST_HEAD(&obj->all_waiters);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static bool is_signaled(struct ntsync_obj *obj, __u32 owner)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&obj->lock);
|
||||||
|
+
|
||||||
|
+ switch (obj->type) {
|
||||||
|
+ case NTSYNC_TYPE_SEM:
|
||||||
|
+ return !!obj->u.sem.count;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ WARN(1, "bad object type %#x\n", obj->type);
|
||||||
|
+ return false;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+/*
|
||||||
|
+ * "locked_obj" is an optional pointer to an object which is already locked and
|
||||||
|
+ * should not be locked again. This is necessary so that changing an object's
|
||||||
|
+ * state and waking it can be a single atomic operation.
|
||||||
|
+ */
|
||||||
|
+static void try_wake_all(struct ntsync_device *dev, struct ntsync_q *q,
|
||||||
|
+ struct ntsync_obj *locked_obj)
|
||||||
|
+{
|
||||||
|
+ __u32 count = q->count;
|
||||||
|
+ bool can_wake = true;
|
||||||
|
+ __u32 i;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&dev->wait_all_lock);
|
||||||
|
+ if (locked_obj)
|
||||||
|
+ lockdep_assert_held(&locked_obj->lock);
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ if (q->entries[i].obj != locked_obj)
|
||||||
|
+ spin_lock_nest_lock(&q->entries[i].obj->lock, &dev->wait_all_lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ if (!is_signaled(q->entries[i].obj, q->owner)) {
|
||||||
|
+ can_wake = false;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (can_wake && atomic_cmpxchg(&q->signaled, -1, 0) == -1) {
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ struct ntsync_obj *obj = q->entries[i].obj;
|
||||||
|
+
|
||||||
|
+ switch (obj->type) {
|
||||||
|
+ case NTSYNC_TYPE_SEM:
|
||||||
|
+ obj->u.sem.count--;
|
||||||
|
+ break;
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+ wake_up_process(q->task);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < count; i++) {
|
||||||
|
+ if (q->entries[i].obj != locked_obj)
|
||||||
|
+ spin_unlock(&q->entries[i].obj->lock);
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static void try_wake_all_obj(struct ntsync_device *dev, struct ntsync_obj *obj)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_q_entry *entry;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&dev->wait_all_lock);
|
||||||
|
+ lockdep_assert_held(&obj->lock);
|
||||||
|
+
|
||||||
|
+ list_for_each_entry(entry, &obj->all_waiters, node)
|
||||||
|
+ try_wake_all(dev, entry->q, obj);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void try_wake_any_sem(struct ntsync_obj *sem)
|
||||||
|
@@ -234,14 +350,29 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
if (!sem)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
- spin_lock(&sem->lock);
|
||||||
|
+ if (atomic_read(&sem->all_hint) > 0) {
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+ spin_lock_nest_lock(&sem->lock, &dev->wait_all_lock);
|
||||||
|
|
||||||
|
- prev_count = sem->u.sem.count;
|
||||||
|
- ret = put_sem_state(sem, args.count);
|
||||||
|
- if (!ret)
|
||||||
|
- try_wake_any_sem(sem);
|
||||||
|
+ prev_count = sem->u.sem.count;
|
||||||
|
+ ret = put_sem_state(sem, args.count);
|
||||||
|
+ if (!ret) {
|
||||||
|
+ try_wake_all_obj(dev, sem);
|
||||||
|
+ try_wake_any_sem(sem);
|
||||||
|
+ }
|
||||||
|
|
||||||
|
- spin_unlock(&sem->lock);
|
||||||
|
+ spin_unlock(&sem->lock);
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+ } else {
|
||||||
|
+ spin_lock(&sem->lock);
|
||||||
|
+
|
||||||
|
+ prev_count = sem->u.sem.count;
|
||||||
|
+ ret = put_sem_state(sem, args.count);
|
||||||
|
+ if (!ret)
|
||||||
|
+ try_wake_any_sem(sem);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&sem->lock);
|
||||||
|
+ }
|
||||||
|
|
||||||
|
put_obj(sem);
|
||||||
|
|
||||||
|
@@ -278,7 +409,7 @@ static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
* Also, calculate the relative timeout.
|
||||||
|
*/
|
||||||
|
static int setup_wait(struct ntsync_device *dev,
|
||||||
|
- const struct ntsync_wait_args *args,
|
||||||
|
+ const struct ntsync_wait_args *args, bool all,
|
||||||
|
ktime_t *ret_timeout, struct ntsync_q **ret_q)
|
||||||
|
{
|
||||||
|
const __u32 count = args->count;
|
||||||
|
@@ -321,6 +452,7 @@ static int setup_wait(struct ntsync_device *dev,
|
||||||
|
q->task = current;
|
||||||
|
q->owner = args->owner;
|
||||||
|
atomic_set(&q->signaled, -1);
|
||||||
|
+ q->all = all;
|
||||||
|
q->count = count;
|
||||||
|
|
||||||
|
for (i = 0; i < count; i++) {
|
||||||
|
@@ -330,6 +462,16 @@ static int setup_wait(struct ntsync_device *dev,
|
||||||
|
if (!obj)
|
||||||
|
goto err;
|
||||||
|
|
||||||
|
+ if (all) {
|
||||||
|
+ /* Check that the objects are all distinct. */
|
||||||
|
+ for (j = 0; j < i; j++) {
|
||||||
|
+ if (obj == q->entries[j].obj) {
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ goto err;
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
entry->obj = obj;
|
||||||
|
entry->q = q;
|
||||||
|
entry->index = i;
|
||||||
|
@@ -370,7 +512,7 @@ static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
return -EFAULT;
|
||||||
|
|
||||||
|
- ret = setup_wait(dev, &args, &timeout, &q);
|
||||||
|
+ ret = setup_wait(dev, &args, false, &timeout, &q);
|
||||||
|
if (ret < 0)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
@@ -432,6 +574,87 @@ static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+static int ntsync_wait_all(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_wait_args args;
|
||||||
|
+ struct ntsync_q *q;
|
||||||
|
+ ktime_t timeout;
|
||||||
|
+ int signaled;
|
||||||
|
+ __u32 i;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ ret = setup_wait(dev, &args, true, &timeout, &q);
|
||||||
|
+ if (ret < 0)
|
||||||
|
+ return ret;
|
||||||
|
+
|
||||||
|
+ /* queue ourselves */
|
||||||
|
+
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ atomic_inc(&obj->all_hint);
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * obj->all_waiters is protected by dev->wait_all_lock rather
|
||||||
|
+ * than obj->lock, so there is no need to acquire it here.
|
||||||
|
+ */
|
||||||
|
+ list_add_tail(&entry->node, &obj->all_waiters);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ /* check if we are already signaled */
|
||||||
|
+
|
||||||
|
+ try_wake_all(dev, q, NULL);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ /* sleep */
|
||||||
|
+
|
||||||
|
+ ret = ntsync_schedule(q, args.timeout ? &timeout : NULL);
|
||||||
|
+
|
||||||
|
+ /* and finally, unqueue */
|
||||||
|
+
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < args.count; i++) {
|
||||||
|
+ struct ntsync_q_entry *entry = &q->entries[i];
|
||||||
|
+ struct ntsync_obj *obj = entry->obj;
|
||||||
|
+
|
||||||
|
+ /*
|
||||||
|
+ * obj->all_waiters is protected by dev->wait_all_lock rather
|
||||||
|
+ * than obj->lock, so there is no need to acquire it here.
|
||||||
|
+ */
|
||||||
|
+ list_del(&entry->node);
|
||||||
|
+
|
||||||
|
+ atomic_dec(&obj->all_hint);
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ signaled = atomic_read(&q->signaled);
|
||||||
|
+ if (signaled != -1) {
|
||||||
|
+ struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
+
|
||||||
|
+ /* even if we caught a signal, we need to communicate success */
|
||||||
|
+ ret = 0;
|
||||||
|
+
|
||||||
|
+ if (put_user(signaled, &user_args->index))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+ } else if (!ret) {
|
||||||
|
+ ret = -ETIMEDOUT;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ kfree(q);
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
unsigned long parm)
|
||||||
|
{
|
||||||
|
@@ -445,6 +668,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
return ntsync_put_sem(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_WAIT_ALL:
|
||||||
|
+ return ntsync_wait_all(dev, argp);
|
||||||
|
case NTSYNC_IOC_WAIT_ANY:
|
||||||
|
return ntsync_wait_any(dev, argp);
|
||||||
|
default:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 10f07da7864e..a5bed5a39b21 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -36,5 +36,7 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_sem_args)
|
||||||
|
#define NTSYNC_IOC_WAIT_ANY _IOWR(NTSYNC_IOC_BASE, 3, \
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
+#define NTSYNC_IOC_WAIT_ALL _IOWR(NTSYNC_IOC_BASE, 4, \
|
||||||
|
+ struct ntsync_wait_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,167 @@
|
||||||
|
This corresponds to the NT syscall NtCreateMutant().
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 72 +++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 8 +++++
|
||||||
|
2 files changed, 80 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 2685363fae9e..d48f2ef41341 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -16,6 +16,7 @@
|
||||||
|
|
||||||
|
enum ntsync_type {
|
||||||
|
NTSYNC_TYPE_SEM,
|
||||||
|
+ NTSYNC_TYPE_MUTEX,
|
||||||
|
};
|
||||||
|
|
||||||
|
struct ntsync_obj {
|
||||||
|
@@ -60,6 +61,10 @@ struct ntsync_obj {
|
||||||
|
__u32 count;
|
||||||
|
__u32 max;
|
||||||
|
} sem;
|
||||||
|
+ struct {
|
||||||
|
+ __u32 count;
|
||||||
|
+ __u32 owner;
|
||||||
|
+ } mutex;
|
||||||
|
} u;
|
||||||
|
};
|
||||||
|
|
||||||
|
@@ -188,6 +193,10 @@ static bool is_signaled(struct ntsync_obj *obj, __u32 owner)
|
||||||
|
switch (obj->type) {
|
||||||
|
case NTSYNC_TYPE_SEM:
|
||||||
|
return !!obj->u.sem.count;
|
||||||
|
+ case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ if (obj->u.mutex.owner && obj->u.mutex.owner != owner)
|
||||||
|
+ return false;
|
||||||
|
+ return obj->u.mutex.count < UINT_MAX;
|
||||||
|
}
|
||||||
|
|
||||||
|
WARN(1, "bad object type %#x\n", obj->type);
|
||||||
|
@@ -230,6 +239,10 @@ static void try_wake_all(struct ntsync_device *dev, struct ntsync_q *q,
|
||||||
|
case NTSYNC_TYPE_SEM:
|
||||||
|
obj->u.sem.count--;
|
||||||
|
break;
|
||||||
|
+ case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ obj->u.mutex.count++;
|
||||||
|
+ obj->u.mutex.owner = q->owner;
|
||||||
|
+ break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
wake_up_process(q->task);
|
||||||
|
@@ -271,6 +284,28 @@ static void try_wake_any_sem(struct ntsync_obj *sem)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
+static void try_wake_any_mutex(struct ntsync_obj *mutex)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_q_entry *entry;
|
||||||
|
+
|
||||||
|
+ lockdep_assert_held(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ list_for_each_entry(entry, &mutex->any_waiters, node) {
|
||||||
|
+ struct ntsync_q *q = entry->q;
|
||||||
|
+
|
||||||
|
+ if (mutex->u.mutex.count == UINT_MAX)
|
||||||
|
+ break;
|
||||||
|
+ if (mutex->u.mutex.owner && mutex->u.mutex.owner != q->owner)
|
||||||
|
+ continue;
|
||||||
|
+
|
||||||
|
+ if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
|
||||||
|
+ mutex->u.mutex.count++;
|
||||||
|
+ mutex->u.mutex.owner = q->owner;
|
||||||
|
+ wake_up_process(q->task);
|
||||||
|
+ }
|
||||||
|
+ }
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
{
|
||||||
|
struct ntsync_sem_args __user *user_args = argp;
|
||||||
|
@@ -303,6 +338,38 @@ static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return put_user(id, &user_args->sem);
|
||||||
|
}
|
||||||
|
|
||||||
|
+static int ntsync_create_mutex(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_mutex_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_mutex_args args;
|
||||||
|
+ struct ntsync_obj *mutex;
|
||||||
|
+ __u32 id;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+
|
||||||
|
+ if (!args.owner != !args.count)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ mutex = kzalloc(sizeof(*mutex), GFP_KERNEL);
|
||||||
|
+ if (!mutex)
|
||||||
|
+ return -ENOMEM;
|
||||||
|
+
|
||||||
|
+ init_obj(mutex);
|
||||||
|
+ mutex->type = NTSYNC_TYPE_MUTEX;
|
||||||
|
+ mutex->u.mutex.count = args.count;
|
||||||
|
+ mutex->u.mutex.owner = args.owner;
|
||||||
|
+
|
||||||
|
+ ret = xa_alloc(&dev->objects, &id, mutex, xa_limit_32b, GFP_KERNEL);
|
||||||
|
+ if (ret < 0) {
|
||||||
|
+ kfree(mutex);
|
||||||
|
+ return ret;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ return put_user(id, &user_args->mutex);
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_delete(struct ntsync_device *dev, void __user *argp)
|
||||||
|
{
|
||||||
|
struct ntsync_obj *obj;
|
||||||
|
@@ -497,6 +564,9 @@ static void try_wake_any_obj(struct ntsync_obj *obj)
|
||||||
|
case NTSYNC_TYPE_SEM:
|
||||||
|
try_wake_any_sem(obj);
|
||||||
|
break;
|
||||||
|
+ case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ try_wake_any_mutex(obj);
|
||||||
|
+ break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@@ -662,6 +732,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
void __user *argp = (void __user *)parm;
|
||||||
|
|
||||||
|
switch (cmd) {
|
||||||
|
+ case NTSYNC_IOC_CREATE_MUTEX:
|
||||||
|
+ return ntsync_create_mutex(dev, argp);
|
||||||
|
case NTSYNC_IOC_CREATE_SEM:
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index a5bed5a39b21..26d1b3d4847f 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -16,6 +16,12 @@ struct ntsync_sem_args {
|
||||||
|
__u32 max;
|
||||||
|
};
|
||||||
|
|
||||||
|
+struct ntsync_mutex_args {
|
||||||
|
+ __u32 mutex;
|
||||||
|
+ __u32 owner;
|
||||||
|
+ __u32 count;
|
||||||
|
+};
|
||||||
|
+
|
||||||
|
struct ntsync_wait_args {
|
||||||
|
__u64 timeout;
|
||||||
|
__u64 objs;
|
||||||
|
@@ -38,5 +44,7 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
#define NTSYNC_IOC_WAIT_ALL _IOWR(NTSYNC_IOC_BASE, 4, \
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
+#define NTSYNC_IOC_CREATE_MUTEX _IOWR(NTSYNC_IOC_BASE, 5, \
|
||||||
|
+ struct ntsync_mutex_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,107 @@
|
||||||
|
This corresponds to the NT syscall NtReleaseMutant().
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 67 +++++++++++++++++++++++++++++++++++++
|
||||||
|
include/uapi/linux/ntsync.h | 2 ++
|
||||||
|
2 files changed, 69 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index d48f2ef41341..28f43768d1c3 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -449,6 +449,71 @@ static int ntsync_put_sem(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+/*
|
||||||
|
+ * Actually change the mutex state, returning -EPERM if not the owner.
|
||||||
|
+ */
|
||||||
|
+static int put_mutex_state(struct ntsync_obj *mutex,
|
||||||
|
+ const struct ntsync_mutex_args *args)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ if (mutex->u.mutex.owner != args->owner)
|
||||||
|
+ return -EPERM;
|
||||||
|
+
|
||||||
|
+ if (!--mutex->u.mutex.count)
|
||||||
|
+ mutex->u.mutex.owner = 0;
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_put_mutex(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_mutex_args __user *user_args = argp;
|
||||||
|
+ struct ntsync_mutex_args args;
|
||||||
|
+ struct ntsync_obj *mutex;
|
||||||
|
+ __u32 prev_count;
|
||||||
|
+ int ret;
|
||||||
|
+
|
||||||
|
+ if (copy_from_user(&args, argp, sizeof(args)))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ if (!args.owner)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ mutex = get_obj_typed(dev, args.mutex, NTSYNC_TYPE_MUTEX);
|
||||||
|
+ if (!mutex)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ if (atomic_read(&mutex->all_hint) > 0) {
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+ spin_lock_nest_lock(&mutex->lock, &dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ prev_count = mutex->u.mutex.count;
|
||||||
|
+ ret = put_mutex_state(mutex, &args);
|
||||||
|
+ if (!ret) {
|
||||||
|
+ try_wake_all_obj(dev, mutex);
|
||||||
|
+ try_wake_any_mutex(mutex);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&mutex->lock);
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+ } else {
|
||||||
|
+ spin_lock(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ prev_count = mutex->u.mutex.count;
|
||||||
|
+ ret = put_mutex_state(mutex, &args);
|
||||||
|
+ if (!ret)
|
||||||
|
+ try_wake_any_mutex(mutex);
|
||||||
|
+
|
||||||
|
+ spin_unlock(&mutex->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ put_obj(mutex);
|
||||||
|
+
|
||||||
|
+ if (!ret && put_user(prev_count, &user_args->count))
|
||||||
|
+ ret = -EFAULT;
|
||||||
|
+
|
||||||
|
+ return ret;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
{
|
||||||
|
int ret = 0;
|
||||||
|
@@ -738,6 +803,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_PUT_MUTEX:
|
||||||
|
+ return ntsync_put_mutex(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
return ntsync_put_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_WAIT_ALL:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 26d1b3d4847f..2e44e7e77776 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -46,5 +46,7 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_wait_args)
|
||||||
|
#define NTSYNC_IOC_CREATE_MUTEX _IOWR(NTSYNC_IOC_BASE, 5, \
|
||||||
|
struct ntsync_mutex_args)
|
||||||
|
+#define NTSYNC_IOC_PUT_MUTEX _IOWR(NTSYNC_IOC_BASE, 6, \
|
||||||
|
+ struct ntsync_mutex_args)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -0,0 +1,170 @@
|
||||||
|
This does not correspond to any NT syscall, but rather should be called by the
|
||||||
|
user-space NT emulator when a thread dies. It is responsible for marking any
|
||||||
|
mutexes owned by that thread as abandoned.
|
||||||
|
|
||||||
|
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
|
||||||
|
---
|
||||||
|
drivers/misc/ntsync.c | 80 ++++++++++++++++++++++++++++++++++++-
|
||||||
|
include/uapi/linux/ntsync.h | 1 +
|
||||||
|
2 files changed, 79 insertions(+), 2 deletions(-)
|
||||||
|
|
||||||
|
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
|
||||||
|
index 28f43768d1c3..1173c750c106 100644
|
||||||
|
--- a/drivers/misc/ntsync.c
|
||||||
|
+++ b/drivers/misc/ntsync.c
|
||||||
|
@@ -64,6 +64,7 @@ struct ntsync_obj {
|
||||||
|
struct {
|
||||||
|
__u32 count;
|
||||||
|
__u32 owner;
|
||||||
|
+ bool ownerdead;
|
||||||
|
} mutex;
|
||||||
|
} u;
|
||||||
|
};
|
||||||
|
@@ -87,6 +88,7 @@ struct ntsync_q {
|
||||||
|
atomic_t signaled;
|
||||||
|
|
||||||
|
bool all;
|
||||||
|
+ bool ownerdead;
|
||||||
|
__u32 count;
|
||||||
|
struct ntsync_q_entry entries[];
|
||||||
|
};
|
||||||
|
@@ -240,6 +242,9 @@ static void try_wake_all(struct ntsync_device *dev, struct ntsync_q *q,
|
||||||
|
obj->u.sem.count--;
|
||||||
|
break;
|
||||||
|
case NTSYNC_TYPE_MUTEX:
|
||||||
|
+ if (obj->u.mutex.ownerdead)
|
||||||
|
+ q->ownerdead = true;
|
||||||
|
+ obj->u.mutex.ownerdead = false;
|
||||||
|
obj->u.mutex.count++;
|
||||||
|
obj->u.mutex.owner = q->owner;
|
||||||
|
break;
|
||||||
|
@@ -299,6 +304,9 @@ static void try_wake_any_mutex(struct ntsync_obj *mutex)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
|
||||||
|
+ if (mutex->u.mutex.ownerdead)
|
||||||
|
+ q->ownerdead = true;
|
||||||
|
+ mutex->u.mutex.ownerdead = false;
|
||||||
|
mutex->u.mutex.count++;
|
||||||
|
mutex->u.mutex.owner = q->owner;
|
||||||
|
wake_up_process(q->task);
|
||||||
|
@@ -514,6 +522,71 @@ static int ntsync_put_mutex(struct ntsync_device *dev, void __user *argp)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
+/*
|
||||||
|
+ * Actually change the mutex state to mark its owner as dead.
|
||||||
|
+ */
|
||||||
|
+static void put_mutex_ownerdead_state(struct ntsync_obj *mutex)
|
||||||
|
+{
|
||||||
|
+ lockdep_assert_held(&mutex->lock);
|
||||||
|
+
|
||||||
|
+ mutex->u.mutex.ownerdead = true;
|
||||||
|
+ mutex->u.mutex.owner = 0;
|
||||||
|
+ mutex->u.mutex.count = 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+static int ntsync_kill_owner(struct ntsync_device *dev, void __user *argp)
|
||||||
|
+{
|
||||||
|
+ struct ntsync_obj *obj;
|
||||||
|
+ unsigned long id;
|
||||||
|
+ __u32 owner;
|
||||||
|
+
|
||||||
|
+ if (get_user(owner, (__u32 __user *)argp))
|
||||||
|
+ return -EFAULT;
|
||||||
|
+ if (!owner)
|
||||||
|
+ return -EINVAL;
|
||||||
|
+
|
||||||
|
+ rcu_read_lock();
|
||||||
|
+
|
||||||
|
+ xa_for_each(&dev->objects, id, obj) {
|
||||||
|
+ if (!kref_get_unless_zero(&obj->refcount))
|
||||||
|
+ continue;
|
||||||
|
+
|
||||||
|
+ if (obj->type != NTSYNC_TYPE_MUTEX) {
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ continue;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (atomic_read(&obj->all_hint) > 0) {
|
||||||
|
+ spin_lock(&dev->wait_all_lock);
|
||||||
|
+ spin_lock_nest_lock(&obj->lock, &dev->wait_all_lock);
|
||||||
|
+
|
||||||
|
+ if (obj->u.mutex.owner == owner) {
|
||||||
|
+ put_mutex_ownerdead_state(obj);
|
||||||
|
+ try_wake_all_obj(dev, obj);
|
||||||
|
+ try_wake_any_mutex(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ spin_unlock(&dev->wait_all_lock);
|
||||||
|
+ } else {
|
||||||
|
+ spin_lock(&obj->lock);
|
||||||
|
+
|
||||||
|
+ if (obj->u.mutex.owner == owner) {
|
||||||
|
+ put_mutex_ownerdead_state(obj);
|
||||||
|
+ try_wake_any_mutex(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ spin_unlock(&obj->lock);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ put_obj(obj);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ rcu_read_unlock();
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
static int ntsync_schedule(const struct ntsync_q *q, ktime_t *timeout)
|
||||||
|
{
|
||||||
|
int ret = 0;
|
||||||
|
@@ -585,6 +658,7 @@ static int setup_wait(struct ntsync_device *dev,
|
||||||
|
q->owner = args->owner;
|
||||||
|
atomic_set(&q->signaled, -1);
|
||||||
|
q->all = all;
|
||||||
|
+ q->ownerdead = false;
|
||||||
|
q->count = count;
|
||||||
|
|
||||||
|
for (i = 0; i < count; i++) {
|
||||||
|
@@ -697,7 +771,7 @@ static int ntsync_wait_any(struct ntsync_device *dev, void __user *argp)
|
||||||
|
struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
|
||||||
|
/* even if we caught a signal, we need to communicate success */
|
||||||
|
- ret = 0;
|
||||||
|
+ ret = q->ownerdead ? -EOWNERDEAD : 0;
|
||||||
|
|
||||||
|
if (put_user(signaled, &user_args->index))
|
||||||
|
ret = -EFAULT;
|
||||||
|
@@ -778,7 +852,7 @@ static int ntsync_wait_all(struct ntsync_device *dev, void __user *argp)
|
||||||
|
struct ntsync_wait_args __user *user_args = argp;
|
||||||
|
|
||||||
|
/* even if we caught a signal, we need to communicate success */
|
||||||
|
- ret = 0;
|
||||||
|
+ ret = q->ownerdead ? -EOWNERDEAD : 0;
|
||||||
|
|
||||||
|
if (put_user(signaled, &user_args->index))
|
||||||
|
ret = -EFAULT;
|
||||||
|
@@ -803,6 +877,8 @@ static long ntsync_char_ioctl(struct file *file, unsigned int cmd,
|
||||||
|
return ntsync_create_sem(dev, argp);
|
||||||
|
case NTSYNC_IOC_DELETE:
|
||||||
|
return ntsync_delete(dev, argp);
|
||||||
|
+ case NTSYNC_IOC_KILL_OWNER:
|
||||||
|
+ return ntsync_kill_owner(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_MUTEX:
|
||||||
|
return ntsync_put_mutex(dev, argp);
|
||||||
|
case NTSYNC_IOC_PUT_SEM:
|
||||||
|
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
|
||||||
|
index 2e44e7e77776..fec9a3993322 100644
|
||||||
|
--- a/include/uapi/linux/ntsync.h
|
||||||
|
+++ b/include/uapi/linux/ntsync.h
|
||||||
|
@@ -48,5 +48,6 @@ struct ntsync_wait_args {
|
||||||
|
struct ntsync_mutex_args)
|
||||||
|
#define NTSYNC_IOC_PUT_MUTEX _IOWR(NTSYNC_IOC_BASE, 6, \
|
||||||
|
struct ntsync_mutex_args)
|
||||||
|
+#define NTSYNC_IOC_KILL_OWNER _IOW (NTSYNC_IOC_BASE, 7, __u32)
|
||||||
|
|
||||||
|
#endif
|
||||||
|
--
|
||||||
|
2.43.0
|
|
@ -1,6 +1,6 @@
|
||||||
pkgname=linux6.7-zen
|
pkgname=linux6.7-zen
|
||||||
version=6.7.1
|
version=6.7.1
|
||||||
revision=1
|
revision=2
|
||||||
zen=1
|
zen=1
|
||||||
python_version=3
|
python_version=3
|
||||||
short_desc="Linux kernel and modules with Zen patches (${version%.*} series)"
|
short_desc="Linux kernel and modules with Zen patches (${version%.*} series)"
|
||||||
|
|
Loading…
Reference in New Issue