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drm/vmwgfx: Assign eviction priorities to resources

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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
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72
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
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@@ -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