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drm/vc4: Add a BO cache.

Sfoglia il codice sorgente 
We need to allocate new BOs in the kernel as part of each frame, but
the CMA allocator is way too slow for that.  As an optimization, keep
track of recently-freed BOs and reuse them, with a 1 second timeout to
fully free them back to the system.

This improves 3D performance by about 15%.

Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Eric Anholt
2015-10-09 20:25:07 -07:00
parent 10028c5ab1
commit c826a6e106
4 ha cambiato i file con 384 aggiunte e 8 eliminazioni
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49
drivers/gpu/drm/vc4/vc4_drv.h
Vedi File

@@ -17,6 +17,37 @@ struct vc4_dev {
struct vc4_crtc *crtc[3];
struct drm_fbdev_cma *fbdev;
/* The kernel-space BO cache. Tracks buffers that have been
* unreferenced by all other users (refcounts of 0!) but not
* yet freed, so we can do cheap allocations.
*/
struct vc4_bo_cache {
/* Array of list heads for entries in the BO cache,
* based on number of pages, so we can do O(1) lookups
* in the cache when allocating.
*/
struct list_head *size_list;
uint32_t size_list_size;
/* List of all BOs in the cache, ordered by age, so we
* can do O(1) lookups when trying to free old
* buffers.
*/
struct list_head time_list;
struct work_struct time_work;
struct timer_list time_timer;
} bo_cache;
struct vc4_bo_stats {
u32 num_allocated;
u32 size_allocated;
u32 num_cached;
u32 size_cached;
} bo_stats;
/* Protects bo_cache and the BO stats. */
struct mutex bo_lock;
};
static inline struct vc4_dev *
@@ -27,6 +58,17 @@ to_vc4_dev(struct drm_device *dev)
struct vc4_bo {
struct drm_gem_cma_object base;
/* List entry for the BO's position in either
* vc4_exec_info->unref_list or vc4_dev->bo_cache.time_list
*/
struct list_head unref_head;
/* Time in jiffies when the BO was put in vc4->bo_cache. */
unsigned long free_time;
/* List entry for the BO's position in vc4_dev->bo_cache.size_list */
struct list_head size_head;
};
static inline struct vc4_bo *
@@ -104,13 +146,18 @@ to_vc4_encoder(struct drm_encoder *encoder)
#define wait_for(COND, MS) _wait_for(COND, MS, 1)
/* vc4_bo.c */
struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size);
void vc4_free_object(struct drm_gem_object *gem_obj);
struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size);
struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size,
bool from_cache);
int vc4_dumb_create(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
struct dma_buf *vc4_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags);
void vc4_bo_cache_init(struct drm_device *dev);
void vc4_bo_cache_destroy(struct drm_device *dev);
int vc4_bo_stats_debugfs(struct seq_file *m, void *arg);
/* vc4_crtc.c */
extern struct platform_driver vc4_crtc_driver;