[PATCH 1/4] drm/vmwgfx: Assign eviction priorities to resources
Thomas Hellström (VMware)
thomas at shipmail.org
Tue Jun 18 06:24:39 UTC 2019
From: Thomas Hellstrom <thellstrom at vmware.com>
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 at vmware.com>
Reviewed-by: Deepak Rawat <drawat at vmware.com>
---
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 2 +
drivers/gpu/drm/vmwgfx/vmwgfx_context.c | 4 ++
drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c | 13 ++--
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 72 +++++++++++++++++++
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 56 +++++++++++----
drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h | 2 +
drivers/gpu/drm/vmwgfx/vmwgfx_shader.c | 8 ++-
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++
8 files changed, 141 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index 5d5c2bce01f3..c0829d50eecc 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -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);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_context.c b/drivers/gpu/drm/vmwgfx/vmwgfx_context.c
index 63f111068a44..a56c9d802382 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_context.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_context.c
@@ -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,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c b/drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
index b4f6e1217c9d..8c699cb2565b 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c
@@ -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;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 366dcfc1f9bb..7c935c72d368 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -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
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 1d38a8b2f2ec..be7d4149a129 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -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);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h
index 7e19eba0b0b8..984e588c62ca 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h
@@ -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);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
index d310d21f0d54..e139fdfd1635 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
@@ -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);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 219471903bc1..c40d44f4d9af 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -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,
--
2.20.1
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