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drm/vmwgfx: Assign eviction priorities to resources 

TTM provides a means to assign eviction priorities to buffer object. This
means that all buffer objects with a lower priority will be evicted first
on memory pressure.
Use this to make sure surfaces and in particular non-dirty surfaces are
evicted first. Evicting in particular shaders, cotables and contexts imply
a significant performance hit on vmwgfx, so make sure these resources are
evicted last.
Some buffer objects are sub-allocated in user-space which means we can have
many resources attached to a single buffer object or resource. In that case
the buffer object is given the highest priority of the attached resources.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
This commit is contained in:
Thomas Hellstrom 2019-03-04 19:37:40 +01:00
parent 561564bea3
commit 4251fa5fc3
8 changed files with 141 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
View File

@ -510,6 +510,8 @@ int vmw_bo_init(struct vmw_private *dev_priv,
acc_size = vmw_bo_acc_size(dev_priv, size, user);
memset(vmw_bo, 0, sizeof(*vmw_bo));
BUILD_BUG_ON(TTM_MAX_BO_PRIORITY <= 3);
vmw_bo->base.priority = 3;
INIT_LIST_HEAD(&vmw_bo->res_list);

4
drivers/gpu/drm/vmwgfx/vmwgfx_context.c
View File

@ -88,6 +88,8 @@ static const struct vmw_res_func vmw_gb_context_func = {
.res_type = vmw_res_context,
.needs_backup = true,
.may_evict = true,
.prio = 3,
.dirty_prio = 3,
.type_name = "guest backed contexts",
.backup_placement = &vmw_mob_placement,
.create = vmw_gb_context_create,
@ -100,6 +102,8 @@ static const struct vmw_res_func vmw_dx_context_func = {
.res_type = vmw_res_dx_context,
.needs_backup = true,
.may_evict = true,
.prio = 3,
.dirty_prio = 3,
.type_name = "dx contexts",
.backup_placement = &vmw_mob_placement,
.create = vmw_dx_context_create,

13
drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
View File

@ -116,6 +116,8 @@ static const struct vmw_res_func vmw_cotable_func = {
.res_type = vmw_res_cotable,
.needs_backup = true,
.may_evict = true,
.prio = 3,
.dirty_prio = 3,
.type_name = "context guest backed object tables",
.backup_placement = &vmw_mob_placement,
.create = vmw_cotable_create,
@ -307,7 +309,7 @@ static int vmw_cotable_unbind(struct vmw_resource *res,
struct ttm_buffer_object *bo = val_buf->bo;
struct vmw_fence_obj *fence;
if (list_empty(&res->mob_head))
if (!vmw_resource_mob_attached(res))
return 0;
WARN_ON_ONCE(bo->mem.mem_type != VMW_PL_MOB);
@ -453,6 +455,7 @@ static int vmw_cotable_resize(struct vmw_resource *res, size_t new_size)
goto out_wait;
}
vmw_resource_mob_detach(res);
res->backup = buf;
res->backup_size = new_size;
vcotbl->size_read_back = cur_size_read_back;
@ -467,12 +470,12 @@ static int vmw_cotable_resize(struct vmw_resource *res, size_t new_size)
res->backup = old_buf;
res->backup_size = old_size;
vcotbl->size_read_back = old_size_read_back;
vmw_resource_mob_attach(res);
goto out_wait;
}
vmw_resource_mob_attach(res);
/* Let go of the old mob. */
list_del(&res->mob_head);
list_add_tail(&res->mob_head, &buf->res_list);
vmw_bo_unreference(&old_buf);
res->id = vcotbl->type;
@ -496,7 +499,7 @@ static int vmw_cotable_resize(struct vmw_resource *res, size_t new_size)
* is called before bind() in the validation sequence is instead used for two
* things.
* 1) Unscrub the cotable if it is scrubbed and still attached to a backup
* buffer, that is, if @res->mob_head is non-empty.
* buffer.
* 2) Resize the cotable if needed.
*/
static int vmw_cotable_create(struct vmw_resource *res)
@ -512,7 +515,7 @@ static int vmw_cotable_create(struct vmw_resource *res)
new_size *= 2;
if (likely(new_size <= res->backup_size)) {
if (vcotbl->scrubbed && !list_empty(&res->mob_head)) {
if (vcotbl->scrubbed && vmw_resource_mob_attached(res)) {
ret = vmw_cotable_unscrub(res);
if (ret)
return ret;

72
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
View File

@ -86,6 +86,15 @@ struct vmw_fpriv {
bool gb_aware; /* user-space is guest-backed aware */
};
/**
* struct vmw_buffer_object - TTM buffer object with vmwgfx additions
* @base: The TTM buffer object
* @res_list: List of resources using this buffer object as a backing MOB
* @pin_count: pin depth
* @dx_query_ctx: DX context if this buffer object is used as a DX query MOB
* @map: Kmap object for semi-persistent mappings
* @res_prios: Eviction priority counts for attached resources
*/
struct vmw_buffer_object {
struct ttm_buffer_object base;
struct list_head res_list;
@ -94,6 +103,7 @@ struct vmw_buffer_object {
struct vmw_resource *dx_query_ctx;
/* Protected by reservation */
struct ttm_bo_kmap_obj map;
u32 res_prios[TTM_MAX_BO_PRIORITY];
};
/**
@ -145,6 +155,7 @@ struct vmw_resource {
struct kref kref;
struct vmw_private *dev_priv;
int id;
u32 used_prio;
unsigned long backup_size;
bool res_dirty;
bool backup_dirty;
@ -709,6 +720,19 @@ extern void vmw_query_move_notify(struct ttm_buffer_object *bo,
extern int vmw_query_readback_all(struct vmw_buffer_object *dx_query_mob);
extern void vmw_resource_evict_all(struct vmw_private *dev_priv);
extern void vmw_resource_unbind_list(struct vmw_buffer_object *vbo);
void vmw_resource_mob_attach(struct vmw_resource *res);
void vmw_resource_mob_detach(struct vmw_resource *res);
/**
* vmw_resource_mob_attached - Whether a resource currently has a mob attached
* @res: The resource
*
* Return: true if the resource has a mob attached, false otherwise.
*/
static inline bool vmw_resource_mob_attached(const struct vmw_resource *res)
{
return !list_empty(&res->mob_head);
}
/**
* vmw_user_resource_noref_release - release a user resource pointer looked up
@ -787,6 +811,54 @@ static inline void vmw_user_bo_noref_release(void)
ttm_base_object_noref_release();
}
/**
* vmw_bo_adjust_prio - Adjust the buffer object eviction priority
* according to attached resources
* @vbo: The struct vmw_buffer_object
*/
static inline void vmw_bo_prio_adjust(struct vmw_buffer_object *vbo)
{
int i = ARRAY_SIZE(vbo->res_prios);
while (i--) {
if (vbo->res_prios[i]) {
vbo->base.priority = i;
return;
}
}
vbo->base.priority = 3;
}
/**
* vmw_bo_prio_add - Notify a buffer object of a newly attached resource
* eviction priority
* @vbo: The struct vmw_buffer_object
* @prio: The resource priority
*
* After being notified, the code assigns the highest resource eviction priority
* to the backing buffer object (mob).
*/
static inline void vmw_bo_prio_add(struct vmw_buffer_object *vbo, int prio)
{
if (vbo->res_prios[prio]++ == 0)
vmw_bo_prio_adjust(vbo);
}
/**
* vmw_bo_prio_del - Notify a buffer object of a resource with a certain
* priority being removed
* @vbo: The struct vmw_buffer_object
* @prio: The resource priority
*
* After being notified, the code assigns the highest resource eviction priority
* to the backing buffer object (mob).
*/
static inline void vmw_bo_prio_del(struct vmw_buffer_object *vbo, int prio)
{
if (--vbo->res_prios[prio] == 0)
vmw_bo_prio_adjust(vbo);
}
/**
* Misc Ioctl functionality - vmwgfx_ioctl.c

56
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
View File

@ -34,6 +34,37 @@
#define VMW_RES_EVICT_ERR_COUNT 10
/**
* vmw_resource_mob_attach - Mark a resource as attached to its backing mob
* @res: The resource
*/
void vmw_resource_mob_attach(struct vmw_resource *res)
{
struct vmw_buffer_object *backup = res->backup;
lockdep_assert_held(&backup->base.resv->lock.base);
res->used_prio = (res->res_dirty) ? res->func->dirty_prio :
res->func->prio;
list_add_tail(&res->mob_head, &backup->res_list);
vmw_bo_prio_add(backup, res->used_prio);
}
/**
* vmw_resource_mob_detach - Mark a resource as detached from its backing mob
* @res: The resource
*/
void vmw_resource_mob_detach(struct vmw_resource *res)
{
struct vmw_buffer_object *backup = res->backup;
lockdep_assert_held(&backup->base.resv->lock.base);
if (vmw_resource_mob_attached(res)) {
list_del_init(&res->mob_head);
vmw_bo_prio_del(backup, res->used_prio);
}
}
struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
{
kref_get(&res->kref);
@ -80,7 +111,7 @@ static void vmw_resource_release(struct kref *kref)
struct ttm_buffer_object *bo = &res->backup->base;
ttm_bo_reserve(bo, false, false, NULL);
if (!list_empty(&res->mob_head) &&
if (vmw_resource_mob_attached(res) &&
res->func->unbind != NULL) {
struct ttm_validate_buffer val_buf;
@ -89,7 +120,7 @@ static void vmw_resource_release(struct kref *kref)
res->func->unbind(res, false, &val_buf);
}
res->backup_dirty = false;
list_del_init(&res->mob_head);
vmw_resource_mob_detach(res);
ttm_bo_unreserve(bo);
vmw_bo_unreference(&res->backup);
}
@ -179,6 +210,7 @@ int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
res->backup_offset = 0;
res->backup_dirty = false;
res->res_dirty = false;
res->used_prio = 3;
if (delay_id)
return 0;
else
@ -355,14 +387,14 @@ static int vmw_resource_do_validate(struct vmw_resource *res,
}
if (func->bind &&
((func->needs_backup && list_empty(&res->mob_head) &&
((func->needs_backup && !vmw_resource_mob_attached(res) &&
val_buf->bo != NULL) ||
(!func->needs_backup && val_buf->bo != NULL))) {
ret = func->bind(res, val_buf);
if (unlikely(ret != 0))
goto out_bind_failed;
if (func->needs_backup)
list_add_tail(&res->mob_head, &res->backup->res_list);
vmw_resource_mob_attach(res);
}
return 0;
@ -402,15 +434,13 @@ void vmw_resource_unreserve(struct vmw_resource *res,
if (switch_backup && new_backup != res->backup) {
if (res->backup) {
lockdep_assert_held(&res->backup->base.resv->lock.base);
list_del_init(&res->mob_head);
vmw_resource_mob_detach(res);
vmw_bo_unreference(&res->backup);
}
if (new_backup) {
res->backup = vmw_bo_reference(new_backup);
lockdep_assert_held(&new_backup->base.resv->lock.base);
list_add_tail(&res->mob_head, &new_backup->res_list);
vmw_resource_mob_attach(res);
} else {
res->backup = NULL;
}
@ -469,7 +499,7 @@ vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
if (unlikely(ret != 0))
goto out_no_reserve;
if (res->func->needs_backup && list_empty(&res->mob_head))
if (res->func->needs_backup && !vmw_resource_mob_attached(res))
return 0;
backup_dirty = res->backup_dirty;
@ -574,11 +604,11 @@ static int vmw_resource_do_evict(struct ww_acquire_ctx *ticket,
return ret;
if (unlikely(func->unbind != NULL &&
(!func->needs_backup || !list_empty(&res->mob_head)))) {
(!func->needs_backup || vmw_resource_mob_attached(res)))) {
ret = func->unbind(res, res->res_dirty, &val_buf);
if (unlikely(ret != 0))
goto out_no_unbind;
list_del_init(&res->mob_head);
vmw_resource_mob_detach(res);
}
ret = func->destroy(res);
res->backup_dirty = true;
@ -660,7 +690,7 @@ int vmw_resource_validate(struct vmw_resource *res, bool intr)
if (unlikely(ret != 0))
goto out_no_validate;
else if (!res->func->needs_backup && res->backup) {
list_del_init(&res->mob_head);
WARN_ON_ONCE(vmw_resource_mob_attached(res));
vmw_bo_unreference(&res->backup);
}
@ -699,7 +729,7 @@ void vmw_resource_unbind_list(struct vmw_buffer_object *vbo)
(void) res->func->unbind(res, res->res_dirty, &val_buf);
res->backup_dirty = true;
res->res_dirty = false;
list_del_init(&res->mob_head);
vmw_resource_mob_detach(res);
}
(void) ttm_bo_wait(&vbo->base, false, false);

2
drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h
View File

@ -78,6 +78,8 @@ struct vmw_res_func {
const char *type_name;
struct ttm_placement *backup_placement;
bool may_evict;
u32 prio;
u32 dirty_prio;
int (*create) (struct vmw_resource *res);
int (*destroy) (struct vmw_resource *res);

8
drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
View File

@ -95,6 +95,8 @@ static const struct vmw_res_func vmw_gb_shader_func = {
.res_type = vmw_res_shader,
.needs_backup = true,
.may_evict = true,
.prio = 3,
.dirty_prio = 3,
.type_name = "guest backed shaders",
.backup_placement = &vmw_mob_placement,
.create = vmw_gb_shader_create,
@ -106,7 +108,9 @@ static const struct vmw_res_func vmw_gb_shader_func = {
static const struct vmw_res_func vmw_dx_shader_func = {
.res_type = vmw_res_shader,
.needs_backup = true,
.may_evict = false,
.may_evict = true,
.prio = 3,
.dirty_prio = 3,
.type_name = "dx shaders",
.backup_placement = &vmw_mob_placement,
.create = vmw_dx_shader_create,
@ -423,7 +427,7 @@ static int vmw_dx_shader_create(struct vmw_resource *res)
WARN_ON_ONCE(!shader->committed);
if (!list_empty(&res->mob_head)) {
if (vmw_resource_mob_attached(res)) {
mutex_lock(&dev_priv->binding_mutex);
ret = vmw_dx_shader_unscrub(res);
mutex_unlock(&dev_priv->binding_mutex);

4
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
View File

@ -112,6 +112,8 @@ static const struct vmw_res_func vmw_legacy_surface_func = {
.res_type = vmw_res_surface,
.needs_backup = false,
.may_evict = true,
.prio = 1,
.dirty_prio = 1,
.type_name = "legacy surfaces",
.backup_placement = &vmw_srf_placement,
.create = &vmw_legacy_srf_create,
@ -124,6 +126,8 @@ static const struct vmw_res_func vmw_gb_surface_func = {
.res_type = vmw_res_surface,
.needs_backup = true,
.may_evict = true,
.prio = 1,
.dirty_prio = 2,
.type_name = "guest backed surfaces",
.backup_placement = &vmw_mob_placement,
.create = vmw_gb_surface_create,