// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
*
* Copyright © 2018 - 2023 VMware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include "vmwgfx_bo.h"
#include "vmwgfx_drv.h"
#include "vmwgfx_resource_priv.h"
#include "vmwgfx_validation.h"
#include <linux/slab.h>
/**
* struct vmw_validation_bo_node - Buffer object validation metadata.
* @base: Metadata used for TTM reservation- and validation.
* @hash: A hash entry used for the duplicate detection hash table.
* @coherent_count: If switching backup buffers, number of new coherent
* resources that will have this buffer as a backup buffer.
*
* Bit fields are used since these structures are allocated and freed in
* large numbers and space conservation is desired.
*/
struct vmw_validation_bo_node {
struct ttm_validate_buffer base;
struct vmwgfx_hash_item hash;
unsigned int coherent_count;
};
/**
* struct vmw_validation_res_node - Resource validation metadata.
* @head: List head for the resource validation list.
* @hash: A hash entry used for the duplicate detection hash table.
* @res: Reference counted resource pointer.
* @new_guest_memory_bo: Non ref-counted pointer to new guest memory buffer
* to be assigned to a resource.
* @new_guest_memory_offset: Offset into the new backup mob for resources
* that can share MOBs.
* @no_buffer_needed: Kernel does not need to allocate a MOB during validation,
* the command stream provides a mob bind operation.
* @switching_guest_memory_bo: The validation process is switching backup MOB.
* @first_usage: True iff the resource has been seen only once in the current
* validation batch.
* @reserved: Whether the resource is currently reserved by this process.
* @dirty_set: Change dirty status of the resource.
* @dirty: Dirty information VMW_RES_DIRTY_XX.
* @private: Optionally additional memory for caller-private data.
*
* Bit fields are used since these structures are allocated and freed in
* large numbers and space conservation is desired.
*/
struct vmw_validation_res_node {
struct list_head head;
struct vmwgfx_hash_item hash;
struct vmw_resource *res;
struct vmw_bo *new_guest_memory_bo;
unsigned long new_guest_memory_offset;
u32 no_buffer_needed : 1;
u32 switching_guest_memory_bo : 1;
u32 first_usage : 1;
u32 reserved : 1;
u32 dirty : 1;
u32 dirty_set : 1;
unsigned long private[];
};
/**
* vmw_validation_mem_alloc - Allocate kernel memory from the validation
* context based allocator
* @ctx: The validation context
* @size: The number of bytes to allocated.
*
* The memory allocated may not exceed PAGE_SIZE, and the returned
* address is aligned to sizeof(long). All memory allocated this way is
* reclaimed after validation when calling any of the exported functions:
* vmw_validation_unref_lists()
* vmw_validation_revert()
* vmw_validation_done()
*
* Return: Pointer to the allocated memory on success. NULL on failure.
*/
void *vmw_validation_mem_alloc(struct vmw_validation_context *ctx,
unsigned int size)
{
void *addr;
size = vmw_validation_align(size);
if (size > PAGE_SIZE)
return NULL;
if (ctx->mem_size_left < size) {
struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page)
return NULL;
list_add_tail(&page->lru, &ctx->page_list);
ctx->page_address = page_address(page);
ctx->mem_size_left = PAGE_SIZE;
}
addr = (void *) (ctx->page_address + (PAGE_SIZE - ctx->mem_size_left));
ctx->mem_size_left -= size;
return addr;
}
/**
* vmw_validation_mem_free - Free all memory allocated using
* vmw_validation_mem_alloc()
* @ctx: The validation context
*
* All memory previously allocated for this context using
* vmw_validation_mem_alloc() is freed.
*/
static void vmw_validation_mem_free(struct vmw_validation_context *ctx)
{
struct page *entry, *next;
list_for_each_entry_safe(entry, next, &ctx->page_list, lru) {
list_del_init(&entry->lru);
__free_page(entry);
}
ctx->mem_size_left = 0;
}
/**
* vmw_validation_find_bo_dup - Find a duplicate buffer object entry in the
* validation context's lists.
* @ctx: The validation context to search.
* @vbo: The buffer object to search for.
*
* Return: Pointer to the struct vmw_validation_bo_node referencing the
* duplicate, or NULL if none found.
*/
static struct vmw_validation_bo_node *
vmw_validation_find_bo_dup(struct vmw_validation_context *ctx,
struct vmw_bo *vbo)
{
struct vmw_validation_bo_node *bo_node = NULL;
if (!ctx->merge_dups)
return NULL;
if (ctx->sw_context) {
struct vmwgfx_hash_item *hash;
unsigned long key = (unsigned long) vbo;
hash_for_each_possible_rcu(ctx->sw_context->res_ht, hash, head, key) {
if (hash->key == key) {
bo_node = container_of(hash, typeof(*bo_node), hash);
break;
}
}
} else {
struct vmw_validation_bo_node *entry;
list_for_each_entry(entry, &ctx->bo_list, base.head) {
if (entry->base.bo == &vbo->tbo) {
bo_node = entry;
break;
}
}
}
return bo_node;
}
/**
* vmw_validation_find_res_dup - Find a duplicate resource entry in the
* validation context's lists.
* @ctx: The validation context to search.
* @res: Reference counted resource pointer.
*
* Return: Pointer to the struct vmw_validation_bo_node referencing the
* duplicate, or NULL if none found.
*/
static struct vmw_validation_res_node *
vmw_validation_find_res_dup(struct vmw_validation_context *ctx,
struct vmw_resource *res)
{
struct vmw_validation_res_node *res_node = NULL;
if (!ctx->merge_dups)
return NULL;
if (ctx->sw_context) {
struct vmwgfx_hash_item *hash;
unsigned long key = (unsigned long) res;
hash_for_each_possible_rcu(ctx->sw_context->res_ht, hash, head, key) {
if (hash->key == key) {
res_node = container_of(hash, typeof(*res_node), hash);
break;
}
}
} else {
struct vmw_validation_res_node *entry;
list_for_each_entry(entry, &ctx->resource_ctx_list, head) {
if (entry->res == res) {
res_node = entry;
goto out;
}
}
list_for_each_entry(entry, &ctx->resource_list, head) {
if (entry->res == res) {
res_node = entry;
break;
}
}
}
out:
return res_node;
}
/**
* vmw_validation_add_bo - Add a buffer object to the validation context.
* @ctx: The validation context.
* @vbo: The buffer object.
*
* Return: Zero on success, negative error code otherwise.
*/
int vmw_validation_add_bo(struct vmw_validation_context *ctx,
struct vmw_bo *vbo)
{
struct vmw_validation_bo_node *bo_node;
bo_node = vmw_validation_find_bo_dup(ctx, vbo);
if (!bo_node) {
struct ttm_validate_buffer *val_buf;
bo_node = vmw_validation_mem_alloc(ctx, sizeof(*bo_node));
if (!bo_node)
return -ENOMEM;
if (ctx->sw_context) {
bo_node->hash.key = (unsigned long) vbo;
hash_add_rcu(ctx->sw_context->res_ht, &bo_node->hash.head,
bo_node->hash.key);
}
val_buf = &bo_node->base;
val_buf->bo = ttm_bo_get_unless_zero(&vbo->tbo);
if (!val_buf->bo)
return -ESRCH;
val_buf->num_shared = 0;
list_add_tail(&val_buf->head, &ctx->bo_list);
}
return 0;
}
/**
* vmw_validation_add_resource - Add a resource to the validation context.
* @ctx: The validation context.
* @res: The resource.
* @priv_size: Size of private, additional metadata.
* @dirty: Whether to change dirty status.
* @p_node: Output pointer of additional metadata address.
* @first_usage: Whether this was the first time this resource was seen.
*
* Return: Zero on success, negative error code otherwise.
*/
int vmw_validation_add_resource(struct vmw_validation_context *ctx,
struct vmw_resource *res,
size_t priv_size,
u32 dirty,
void **p_node,
bool *first_usage)
{
struct vmw_validation_res_node *node;
node = vmw_validation_find_res_dup(ctx, res);
if (node) {
node->first_usage = 0;
goto out_fill;
}
node = vmw_validation_mem_alloc(ctx, sizeof(*node) + priv_size);
if (!node) {
VMW_DEBUG_USER("Failed to allocate a resource validation entry.\n");
return -ENOMEM;
}
if (ctx->sw_context) {
node->hash.key = (unsigned long) res;
hash_add_rcu(ctx->sw_context->res_ht, &node->hash.head, node->hash.key);
}
node->res = vmw_resource_reference_unless_doomed(res);
if (!node->res)
return -ESRCH;
node->first_usage = 1;
if (!res->dev_priv->has_mob) {
list_add_tail(&node->head, &ctx->resource_list);
} else {
switch (vmw_res_type(res)) {
case vmw_res_context:
case vmw_res_dx_context:
list_add(&node->head, &ctx->resource_ctx_list);
break;
case vmw_res_cotable:
list_add_tail(&node->head, &ctx->resource_ctx_list);
break;
default:
list_add_tail(&node->head, &ctx->resource_list);
break;
}
}
out_fill:
if (dirty) {
node->dirty_set = 1;
/* Overwriting previous information here is intentional! */
node->dirty = (dirty & VMW_RES_DIRTY_SET) ? 1 : 0;
}
if (first_usage)
*first_usage = node->first_usage;
if (p_node)
*p_node = &node->private;
return 0;
}
/**
* vmw_validation_res_set_dirty - Register a resource dirty set or clear during
* validation.
* @ctx: The validation context.
* @val_private: The additional meta-data pointer returned when the
* resource was registered with the validation context. Used to identify
* the resource.
* @dirty: Dirty information VMW_RES_DIRTY_XX
*/
void vmw_validation_res_set_dirty(struct vmw_validation_context *ctx,
void *val_private, u32 dirty)
{
struct vmw_validation_res_node *val;
if (!dirty)
return;
val = container_of(val_private, typeof(*val), private);
val->dirty_set = 1;
/* Overwriting previous information here is intentional! */
val->dirty = (dirty & VMW_RES_DIRTY_SET) ? 1 : 0;
}
/**
* vmw_validation_res_switch_backup - Register a backup MOB switch during
* validation.
* @ctx: The validation context.
* @val_private: The additional meta-data pointer returned when the
* resource was registered with the validation context. Used to identify
* the resource.
* @vbo: The new backup buffer object MOB. This buffer object needs to have
* already been registered with the validation context.
* @guest_memory_offset: Offset into the new backup MOB.
*/
void vmw_validation_res_switch_backup(struct vmw_validation_context *ctx,
void *val_private,
struct vmw_bo *vbo,
unsigned long guest_memory_offset)
{
struct vmw_validation_res_node *val;
val = container_of(val_private, typeof(*val), private);
val->switching_guest_memory_bo = 1;
if (val->first_usage)
val->no_buffer_needed = 1;
val->new_guest_memory_bo = vbo;
val->new_guest_memory_offset = guest_memory_offset;
}
/**
* vmw_validation_res_reserve - Reserve all resources registered with this
* validation context.
* @ctx: The validation context.
* @intr: Use interruptible waits when possible.
*
* Return: Zero on success, -ERESTARTSYS if interrupted. Negative error
* code on failure.
*/
int vmw_validation_res_reserve(struct vmw_validation_context *ctx,
bool intr)
{
struct vmw_validation_res_node *val;
int ret = 0;
list_splice_init(&ctx->resource_ctx_list, &ctx->resource_list);
list_for_each_entry(val, &ctx->resource_list, head) {
struct vmw_resource *res = val->res;
ret = vmw_resource_reserve(res, intr, val->no_buffer_needed);
if (ret)
goto out_unreserve;
val->reserved = 1;
if (res->guest_memory_bo) {
struct vmw_bo *vbo = res->guest_memory_bo;
vmw_bo_placement_set(vbo,
res->func->domain,
res->func->busy_domain);
ret = vmw_validation_add_bo(ctx, vbo);
if (ret)
goto out_unreserve;
}
if (val->switching_guest_memory_bo && val->new_guest_memory_bo &&
res->coherent) {
struct vmw_validation_bo_node *bo_node =
vmw_validation_find_bo_dup(ctx,
val->new_guest_memory_bo);
if (WARN_ON(!bo_node)) {
ret = -EINVAL;
goto out_unreserve;
}
bo_node->coherent_count++;
}
}
return 0;
out_unreserve:
vmw_validation_res_unreserve(ctx, true);
return ret;
}
/**
* vmw_validation_res_unreserve - Unreserve all reserved resources
* registered with this validation context.
* @ctx: The validation context.
* @backoff: Whether this is a backoff- of a commit-type operation. This
* is used to determine whether to switch backup MOBs or not.
*/
void vmw_validation_res_unreserve(struct vmw_validation_context *ctx,
bool backoff)
{
struct vmw_validation_res_node *val;
list_splice_init(&ctx->resource_ctx_list, &ctx->resource_list);
if (backoff)
list_for_each_entry(val, &ctx->resource_list, head) {
if (val->reserved)
vmw_resource_unreserve(val->res,
false, false, false,
NULL, 0);
}
else
list_for_each_entry(val, &ctx->resource_list, head) {
if (val->reserved)
vmw_resource_unreserve(val->res,
val->dirty_set,
val->dirty,
val->switching_guest_memory_bo,
val->new_guest_memory_bo,
val->new_guest_memory_offset);
}
}
/**
* vmw_validation_bo_validate_single - Validate a single buffer object.
* @bo: The TTM buffer object base.
* @interruptible: Whether to perform waits interruptible if possible.
*
* Return: Zero on success, -ERESTARTSYS if interrupted. Negative error
* code on failure.
*/
static int vmw_validation_bo_validate_single(struct ttm_buffer_object *bo,
bool interruptible)
{
struct vmw_bo *vbo = to_vmw_bo(&bo->base);
struct ttm_operation_ctx ctx = {
.interruptible = interruptible,
.no_wait_gpu = false
};
int ret;
if (atomic_read(&vbo->cpu_writers))
return -EBUSY;
if (vbo->tbo.pin_count > 0)
return 0;
ret = ttm_bo_validate(bo, &vbo->placement, &ctx);
if (ret == 0 || ret == -ERESTARTSYS)
return ret;
/*
* If that failed, try again, this time evicting
* previous contents.
*/
ctx.allow_res_evict = true;
return ttm_bo_validate(bo, &vbo->placement, &ctx);
}
/**
* vmw_validation_bo_validate - Validate all buffer objects registered with
* the validation context.
* @ctx: The validation context.
* @intr: Whether to perform waits interruptible if possible.
*
* Return: Zero on success, -ERESTARTSYS if interrupted,
* negative error code on failure.
*/
int vmw_validation_bo_validate(struct vmw_validation_context *ctx, bool intr)
{
struct vmw_validation_bo_node *entry;
int ret;
list_for_each_entry(entry, &ctx->bo_list, base.head) {
struct vmw_bo *vbo = to_vmw_bo(&entry->base.bo->base);
ret = vmw_validation_bo_validate_single(entry->base.bo, intr);
if (ret)
return ret;
/*
* Rather than having the resource code allocating the bo
* dirty tracker in resource_unreserve() where we can't fail,
* Do it here when validating the buffer object.
*/
if (entry->coherent_count) {
unsigned int coherent_count = entry->coherent_count;
while (coherent_count) {
ret = vmw_bo_dirty_add(vbo);
if (ret)
return ret;
coherent_count--;
}
entry->coherent_count -= coherent_count;
}
if (vbo->dirty)
vmw_bo_dirty_scan(vbo);
}
return 0;
}
/**
* vmw_validation_res_validate - Validate all resources registered with the
* validation context.
* @ctx: The validation context.
* @intr: Whether to perform waits interruptible if possible.
*
* Before this function is called, all resource backup buffers must have
* been validated.
*
* Return: Zero on success, -ERESTARTSYS if interrupted,
* negative error code on failure.
*/
int vmw_validation_res_validate(struct vmw_validation_context *ctx, bool intr)
{
struct vmw_validation_res_node *val;
int ret;
list_for_each_entry(val, &ctx->resource_list, head) {
struct vmw_resource *res = val->res;
struct vmw_bo *backup = res->guest_memory_bo;
ret = vmw_resource_validate(res, intr, val->dirty_set &&
val->dirty);
if (ret) {
if (ret != -ERESTARTSYS)
DRM_ERROR("Failed to validate resource.\n");
return ret;
}
/* Check if the resource switched backup buffer */
if (backup && res->guest_memory_bo && backup != res->guest_memory_bo) {
struct vmw_bo *vbo = res->guest_memory_bo;
vmw_bo_placement_set(vbo, res->func->domain,
res->func->busy_domain);
ret = vmw_validation_add_bo(ctx, vbo);
if (ret)
return ret;
}
}
return 0;
}
/**
* vmw_validation_drop_ht - Reset the hash table used for duplicate finding
* and unregister it from this validation context.
* @ctx: The validation context.
*
* The hash table used for duplicate finding is an expensive resource and
* may be protected by mutexes that may cause deadlocks during resource
* unreferencing if held. After resource- and buffer object registering,
* there is no longer any use for this hash table, so allow freeing it
* either to shorten any mutex locking time, or before resources- and
* buffer objects are freed during validation context cleanup.
*/
void vmw_validation_drop_ht(struct vmw_validation_context *ctx)
{
struct vmw_validation_bo_node *entry;
struct vmw_validation_res_node *val;
if (!ctx->sw_context)
return;
list_for_each_entry(entry, &ctx->bo_list, base.head)
hash_del_rcu(&entry->hash.head);
list_for_each_entry(val, &ctx->resource_list, head)
hash_del_rcu(&val->hash.head);
list_for_each_entry(val, &ctx->resource_ctx_list, head)
hash_del_rcu(&entry->hash.head);
ctx->sw_context = NULL;
}
/**
* vmw_validation_unref_lists - Unregister previously registered buffer
* object and resources.
* @ctx: The validation context.
*
* Note that this function may cause buffer object- and resource destructors
* to be invoked.
*/
void vmw_validation_unref_lists(struct vmw_validation_context *ctx)
{
struct vmw_validation_bo_node *entry;
struct vmw_validation_res_node *val;
list_for_each_entry(entry, &ctx->bo_list, base.head) {
ttm_bo_put(entry->base.bo);
entry->base.bo = NULL;
}
list_splice_init(&ctx->resource_ctx_list, &ctx->resource_list);
list_for_each_entry(val, &ctx->resource_list, head)
vmw_resource_unreference(&val->res);
/*
* No need to detach each list entry since they are all freed with
* vmw_validation_free_mem. Just make the inaccessible.
*/
INIT_LIST_HEAD(&ctx->bo_list);
INIT_LIST_HEAD(&ctx->resource_list);
vmw_validation_mem_free(ctx);
}
/**
* vmw_validation_prepare - Prepare a validation context for command
* submission.
* @ctx: The validation context.
* @mutex: The mutex used to protect resource reservation.
* @intr: Whether to perform waits interruptible if possible.
*
* Note that the single reservation mutex @mutex is an unfortunate
* construct. Ideally resource reservation should be moved to per-resource
* ww_mutexes.
* If this functions doesn't return Zero to indicate success, all resources
* are left unreserved but still referenced.
* Return: Zero on success, -ERESTARTSYS if interrupted, negative error code
* on error.
*/
int vmw_validation_prepare(struct vmw_validation_context *ctx,
struct mutex *mutex,
bool intr)
{
int ret = 0;
if (mutex) {
if (intr)
ret = mutex_lock_interruptible(mutex);
else
mutex_lock(mutex);
if (ret)
return -ERESTARTSYS;
}
ctx->res_mutex = mutex;
ret = vmw_validation_res_reserve(ctx, intr);
if (ret)
goto out_no_res_reserve;
ret = vmw_validation_bo_reserve(ctx, intr);
if (ret)
goto out_no_bo_reserve;
ret = vmw_validation_bo_validate(ctx, intr);
if (ret)
goto out_no_validate;
ret = vmw_validation_res_validate(ctx, intr);
if (ret)
goto out_no_validate;
return 0;
out_no_validate:
vmw_validation_bo_backoff(ctx);
out_no_bo_reserve:
vmw_validation_res_unreserve(ctx, true);
out_no_res_reserve:
if (mutex)
mutex_unlock(mutex);
return ret;
}
/**
* vmw_validation_revert - Revert validation actions if command submission
* failed.
*
* @ctx: The validation context.
*
* The caller still needs to unref resources after a call to this function.
*/
void vmw_validation_revert(struct vmw_validation_context *ctx)
{
vmw_validation_bo_backoff(ctx);
vmw_validation_res_unreserve(ctx, true);
if (ctx->res_mutex)
mutex_unlock(ctx->res_mutex);
vmw_validation_unref_lists(ctx);
}
/**
* vmw_validation_done - Commit validation actions after command submission
* success.
* @ctx: The validation context.
* @fence: Fence with which to fence all buffer objects taking part in the
* command submission.
*
* The caller does NOT need to unref resources after a call to this function.
*/
void vmw_validation_done(struct vmw_validation_context *ctx,
struct vmw_fence_obj *fence)
{
vmw_validation_bo_fence(ctx, fence);
vmw_validation_res_unreserve(ctx, false);
if (ctx->res_mutex)
mutex_unlock(ctx->res_mutex);
vmw_validation_unref_lists(ctx);
}
/**
* vmw_validation_preload_bo - Preload the validation memory allocator for a
* call to vmw_validation_add_bo().
* @ctx: Pointer to the validation context.
*
* Iff this function returns successfully, the next call to
* vmw_validation_add_bo() is guaranteed not to sleep. An error is not fatal
* but voids the guarantee.
*
* Returns: Zero if successful, %-EINVAL otherwise.
*/
int vmw_validation_preload_bo(struct vmw_validation_context *ctx)
{
unsigned int size = sizeof(struct vmw_validation_bo_node);
if (!vmw_validation_mem_alloc(ctx, size))
return -ENOMEM;
ctx->mem_size_left += size;
return 0;
}
/**
* vmw_validation_preload_res - Preload the validation memory allocator for a
* call to vmw_validation_add_res().
* @ctx: Pointer to the validation context.
* @size: Size of the validation node extra data. See below.
*
* Iff this function returns successfully, the next call to
* vmw_validation_add_res() with the same or smaller @size is guaranteed not to
* sleep. An error is not fatal but voids the guarantee.
*
* Returns: Zero if successful, %-EINVAL otherwise.
*/
int vmw_validation_preload_res(struct vmw_validation_context *ctx,
unsigned int size)
{
size = vmw_validation_align(sizeof(struct vmw_validation_res_node) +
size) +
vmw_validation_align(sizeof(struct vmw_validation_bo_node));
if (!vmw_validation_mem_alloc(ctx, size))
return -ENOMEM;
ctx->mem_size_left += size;
return 0;
}
/**
* vmw_validation_bo_backoff - Unreserve buffer objects registered with a
* validation context
* @ctx: The validation context
*
* This function unreserves the buffer objects previously reserved using
* vmw_validation_bo_reserve. It's typically used as part of an error path
*/
void vmw_validation_bo_backoff(struct vmw_validation_context *ctx)
{
struct vmw_validation_bo_node *entry;
/*
* Switching coherent resource backup buffers failed.
* Release corresponding buffer object dirty trackers.
*/
list_for_each_entry(entry, &ctx->bo_list, base.head) {
if (entry->coherent_count) {
unsigned int coherent_count = entry->coherent_count;
struct vmw_bo *vbo = to_vmw_bo(&entry->base.bo->base);
while (coherent_count--)
vmw_bo_dirty_release(vbo);
}
}
ttm_eu_backoff_reservation(&ctx->ticket, &ctx->bo_list);
}
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