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dxgprocess.c
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dxgprocess.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2022, Microsoft Corporation.
*
* Author:
* Iouri Tarassov <iourit@linux.microsoft.com>
*
* Dxgkrnl Graphics Driver
* DXGPROCESS implementation
*
*/
#include "dxgkrnl.h"
#include "linux/sched.h"
#include <linux/pid_namespace.h>
#undef dev_fmt
#define dev_fmt(fmt) "dxgk: " fmt
/*
* Creates a new dxgprocess object
* Must be called when dxgglobal->plistmutex is held
*/
struct dxgprocess *dxgprocess_create(void)
{
struct dxgprocess *process;
int ret;
struct dxgglobal *dxgglobal = dxggbl();
process = kzalloc(sizeof(struct dxgprocess), GFP_KERNEL);
if (process != NULL) {
DXG_TRACE("new dxgprocess created");
process->pid = current->pid;
process->tgid = current->tgid;
process->vpid = task_pid_vnr(current);
process->nspid = task_active_pid_ns(current);
ret = dxgvmb_send_create_process(process);
if (ret < 0) {
DXG_TRACE("send_create_process failed");
kfree(process);
process = NULL;
} else {
INIT_LIST_HEAD(&process->plistentry);
kref_init(&process->process_kref);
kref_init(&process->process_mem_kref);
mutex_lock(&dxgglobal->plistmutex);
list_add_tail(&process->plistentry,
&dxgglobal->plisthead);
mutex_unlock(&dxgglobal->plistmutex);
hmgrtable_init(&process->handle_table, process);
hmgrtable_init(&process->local_handle_table, process);
INIT_LIST_HEAD(&process->process_adapter_list_head);
}
}
return process;
}
void dxgprocess_destroy(struct dxgprocess *process)
{
int i;
enum hmgrentry_type t;
struct d3dkmthandle h;
void *o;
struct dxgsyncobject *syncobj;
struct dxgprocess_adapter *entry;
struct dxgprocess_adapter *tmp;
/* Destroy all adapter state */
dxgglobal_acquire_process_adapter_lock();
list_for_each_entry_safe(entry, tmp,
&process->process_adapter_list_head,
process_adapter_list_entry) {
dxgprocess_adapter_destroy(entry);
}
dxgglobal_release_process_adapter_lock();
i = 0;
while (hmgrtable_next_entry(&process->local_handle_table,
&i, &t, &h, &o)) {
switch (t) {
case HMGRENTRY_TYPE_DXGADAPTER:
dxgprocess_close_adapter(process, h);
break;
default:
DXG_ERR("invalid entry in handle table %d", t);
break;
}
}
i = 0;
while (hmgrtable_next_entry(&process->handle_table, &i, &t, &h, &o)) {
switch (t) {
case HMGRENTRY_TYPE_DXGSYNCOBJECT:
DXG_TRACE("Destroy syncobj: %p %d", o, i);
syncobj = o;
syncobj->handle.v = 0;
dxgsyncobject_destroy(process, syncobj);
break;
default:
DXG_ERR("invalid entry in handle table %d", t);
break;
}
}
hmgrtable_destroy(&process->handle_table);
hmgrtable_destroy(&process->local_handle_table);
}
void dxgprocess_release(struct kref *refcount)
{
struct dxgprocess *process;
struct dxgglobal *dxgglobal = dxggbl();
process = container_of(refcount, struct dxgprocess, process_kref);
mutex_lock(&dxgglobal->plistmutex);
list_del(&process->plistentry);
mutex_unlock(&dxgglobal->plistmutex);
dxgprocess_destroy(process);
if (process->host_handle.v) {
dxgvmb_send_destroy_process(process->host_handle);
process->host_handle.v = 0;
}
}
void dxgprocess_mem_release(struct kref *refcount)
{
struct dxgprocess *process;
process = container_of(refcount, struct dxgprocess, process_mem_kref);
kfree(process);
}
struct dxgprocess_adapter *dxgprocess_get_adapter_info(struct dxgprocess
*process,
struct dxgadapter
*adapter)
{
struct dxgprocess_adapter *entry;
list_for_each_entry(entry, &process->process_adapter_list_head,
process_adapter_list_entry) {
if (adapter == entry->adapter) {
DXG_TRACE("Found process info %p", entry);
return entry;
}
}
return NULL;
}
/*
* Dxgprocess takes references on dxgadapter and dxgprocess_adapter.
*
* The process_adapter lock is held.
*
*/
int dxgprocess_open_adapter(struct dxgprocess *process,
struct dxgadapter *adapter,
struct d3dkmthandle *h)
{
int ret = 0;
struct dxgprocess_adapter *adapter_info;
struct d3dkmthandle handle;
h->v = 0;
adapter_info = dxgprocess_get_adapter_info(process, adapter);
if (adapter_info == NULL) {
DXG_TRACE("creating new process adapter info");
adapter_info = dxgprocess_adapter_create(process, adapter);
if (adapter_info == NULL) {
ret = -ENOMEM;
goto cleanup;
}
} else {
adapter_info->refcount++;
}
handle = hmgrtable_alloc_handle_safe(&process->local_handle_table,
adapter, HMGRENTRY_TYPE_DXGADAPTER,
true);
if (handle.v) {
*h = handle;
} else {
DXG_ERR("failed to create adapter handle");
ret = -ENOMEM;
}
cleanup:
if (ret < 0) {
if (adapter_info)
dxgprocess_adapter_release(adapter_info);
}
return ret;
}
int dxgprocess_close_adapter(struct dxgprocess *process,
struct d3dkmthandle handle)
{
struct dxgadapter *adapter;
struct dxgprocess_adapter *adapter_info;
int ret = 0;
if (handle.v == 0)
return 0;
hmgrtable_lock(&process->local_handle_table, DXGLOCK_EXCL);
adapter = dxgprocess_get_adapter(process, handle);
if (adapter)
hmgrtable_free_handle(&process->local_handle_table,
HMGRENTRY_TYPE_DXGADAPTER, handle);
hmgrtable_unlock(&process->local_handle_table, DXGLOCK_EXCL);
if (adapter) {
mutex_lock(&adapter->device_creation_lock);
dxgglobal_acquire_process_adapter_lock();
adapter_info = dxgprocess_get_adapter_info(process, adapter);
if (adapter_info)
dxgprocess_adapter_release(adapter_info);
else
ret = -EINVAL;
dxgglobal_release_process_adapter_lock();
mutex_unlock(&adapter->device_creation_lock);
} else {
DXG_ERR("Adapter not found %x", handle.v);
ret = -EINVAL;
}
return ret;
}
struct dxgadapter *dxgprocess_get_adapter(struct dxgprocess *process,
struct d3dkmthandle handle)
{
struct dxgadapter *adapter;
adapter = hmgrtable_get_object_by_type(&process->local_handle_table,
HMGRENTRY_TYPE_DXGADAPTER,
handle);
if (adapter == NULL)
DXG_ERR("Adapter not found %x", handle.v);
return adapter;
}
/*
* Gets the adapter object from the process handle table.
* The adapter object is referenced.
* The function acquired the handle table lock shared.
*/
struct dxgadapter *dxgprocess_adapter_by_handle(struct dxgprocess *process,
struct d3dkmthandle handle)
{
struct dxgadapter *adapter;
hmgrtable_lock(&process->local_handle_table, DXGLOCK_SHARED);
adapter = hmgrtable_get_object_by_type(&process->local_handle_table,
HMGRENTRY_TYPE_DXGADAPTER,
handle);
if (adapter == NULL)
DXG_TRACE("adapter_by_handle failed %x", handle.v);
else if (kref_get_unless_zero(&adapter->adapter_kref) == 0) {
DXG_ERR("failed to acquire adapter reference");
adapter = NULL;
}
hmgrtable_unlock(&process->local_handle_table, DXGLOCK_SHARED);
return adapter;
}
struct dxgdevice *dxgprocess_device_by_object_handle(struct dxgprocess *process,
enum hmgrentry_type t,
struct d3dkmthandle handle)
{
struct dxgdevice *device = NULL;
void *obj;
hmgrtable_lock(&process->handle_table, DXGLOCK_SHARED);
obj = hmgrtable_get_object_by_type(&process->handle_table, t, handle);
if (obj) {
struct d3dkmthandle device_handle = {};
switch (t) {
case HMGRENTRY_TYPE_DXGDEVICE:
device = obj;
break;
case HMGRENTRY_TYPE_DXGCONTEXT:
device_handle =
((struct dxgcontext *)obj)->device_handle;
break;
case HMGRENTRY_TYPE_DXGPAGINGQUEUE:
device_handle =
((struct dxgpagingqueue *)obj)->device_handle;
break;
case HMGRENTRY_TYPE_DXGHWQUEUE:
device_handle =
((struct dxghwqueue *)obj)->device_handle;
break;
default:
DXG_ERR("invalid handle type: %d", t);
break;
}
if (device == NULL)
device = hmgrtable_get_object_by_type(
&process->handle_table,
HMGRENTRY_TYPE_DXGDEVICE,
device_handle);
if (device)
if (kref_get_unless_zero(&device->device_kref) == 0)
device = NULL;
}
if (device == NULL)
DXG_ERR("device_by_handle failed: %d %x", t, handle.v);
hmgrtable_unlock(&process->handle_table, DXGLOCK_SHARED);
return device;
}
struct dxgdevice *dxgprocess_device_by_handle(struct dxgprocess *process,
struct d3dkmthandle handle)
{
return dxgprocess_device_by_object_handle(process,
HMGRENTRY_TYPE_DXGDEVICE,
handle);
}
void dxgprocess_ht_lock_shared_down(struct dxgprocess *process)
{
hmgrtable_lock(&process->handle_table, DXGLOCK_SHARED);
}
void dxgprocess_ht_lock_shared_up(struct dxgprocess *process)
{
hmgrtable_unlock(&process->handle_table, DXGLOCK_SHARED);
}
void dxgprocess_ht_lock_exclusive_down(struct dxgprocess *process)
{
hmgrtable_lock(&process->handle_table, DXGLOCK_EXCL);
}
void dxgprocess_ht_lock_exclusive_up(struct dxgprocess *process)
{
hmgrtable_unlock(&process->handle_table, DXGLOCK_EXCL);
}