From: Jerome Glisse <jglisse@xxxxxxxxxx>
This patch add a minimum residency time configurable for each memory
pool (VRAM, GTT, ...). Intention is to avoid having a lot of memory
eviction from VRAM up to a point where the GPU pretty much spend all
it's time moving things in and out.
Signed-off-by: Jerome Glisse <jglisse@xxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 3 +++
drivers/gpu/drm/ttm/ttm_bo.c | 7 +++++++
include/drm/ttm/ttm_bo_api.h | 1 +
include/drm/ttm/ttm_bo_driver.h | 1 +
4 files changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 5ebe1b3..88722c4 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -129,11 +129,13 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
switch (type) {
case TTM_PL_SYSTEM:
/* System memory */
+ man->minimum_residency_time_ms = 0;
man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
man->available_caching = TTM_PL_MASK_CACHING;
man->default_caching = TTM_PL_FLAG_CACHED;
break;
case TTM_PL_TT:
+ man->minimum_residency_time_ms = 0;
man->func = &ttm_bo_manager_func;
man->gpu_offset = rdev->mc.gtt_start;
man->available_caching = TTM_PL_MASK_CACHING;
@@ -156,6 +158,7 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
break;
case TTM_PL_VRAM:
/* "On-card" video ram */
+ man->minimum_residency_time_ms = 500;
man->func = &ttm_bo_manager_func;
man->gpu_offset = rdev->mc.vram_start;
man->flags = TTM_MEMTYPE_FLAG_FIXED |
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 39dcc58..40476121 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -452,6 +452,7 @@ moved:
bo->cur_placement = bo->mem.placement;
} else
bo->offset = 0;
+ bo->jiffies = jiffies;
return 0;
@@ -810,6 +811,12 @@ retry:
}
bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
+
+ if (time_after(jiffies, bo->jiffies) && jiffies_to_msecs(jiffies - bo->jiffies) >= man->minimum_residency_time_ms) {
+ spin_unlock(&glob->lru_lock);
+ return -EBUSY;
+ }
+
kref_get(&bo->list_kref);
if (!list_empty(&bo->ddestroy)) {
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index e8028ad..9e12313 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -275,6 +275,7 @@ struct ttm_buffer_object {
unsigned long offset;
uint32_t cur_placement;
+ unsigned long jiffies;
struct sg_table *sg;
};
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index d803b92..7f60a18e6 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -280,6 +280,7 @@ struct ttm_mem_type_manager {
struct mutex io_reserve_mutex;
bool use_io_reserve_lru;
bool io_reserve_fastpath;
+ unsigned long minimum_residency_time_ms;
/*
* Protected by @io_reserve_mutex:
--
1.7.11.7
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