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sna/gen7: Prefer the render ring for more operations 

As we get more well-endowed GPUs with ever more execution units, it
becomes advantageous to do even basic copies through the render ring.
However, the extra performance comes at a cost - higher power usage. To
mitigate this, we apply a heuristic of only allowing a switch over to
the render ring if the render ring is already active with an early
request (in addition to the usual stall avoidance and general
performance heuristics).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-08-23 02:10:11 +01:00
parent f57ce6ef9c
commit 509e7aaf84
1 changed files with 45 additions and 0 deletions
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45
src/sna/gen7_render.c
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@ -85,6 +85,7 @@ struct gt_info {
int max_gs_entries;
int push_ps_size; /* in 1KBs */
} urb;
int gt;
};
static const struct gt_info ivb_gt_info = {
@ -93,6 +94,7 @@ static const struct gt_info ivb_gt_info = {
.max_gs_threads = 16,
.max_wm_threads = (16-1) << IVB_PS_MAX_THREADS_SHIFT,
.urb = { 128, 64, 64, 8 },
.gt = 0,
};
static const struct gt_info ivb_gt1_info = {
@ -101,6 +103,7 @@ static const struct gt_info ivb_gt1_info = {
.max_gs_threads = 36,
.max_wm_threads = (48-1) << IVB_PS_MAX_THREADS_SHIFT,
.urb = { 128, 512, 192, 8 },
.gt = 1,
};
static const struct gt_info ivb_gt2_info = {
@ -109,6 +112,7 @@ static const struct gt_info ivb_gt2_info = {
.max_gs_threads = 128,
.max_wm_threads = (172-1) << IVB_PS_MAX_THREADS_SHIFT,
.urb = { 256, 704, 320, 8 },
.gt = 2,
};
static const struct gt_info byt_gt_info = {
@ -118,6 +122,7 @@ static const struct gt_info byt_gt_info = {
.max_gs_threads = 36,
.max_wm_threads = (48-1) << IVB_PS_MAX_THREADS_SHIFT,
.urb = { 128, 512, 192, 8 },
.gt = 1,
};
static const struct gt_info hsw_gt_info = {
@ -128,6 +133,7 @@ static const struct gt_info hsw_gt_info = {
(8 - 1) << HSW_PS_MAX_THREADS_SHIFT |
1 << HSW_PS_SAMPLE_MASK_SHIFT,
.urb = { 128, 64, 64, 8 },
.gt = 0,
};
static const struct gt_info hsw_gt1_info = {
@ -138,6 +144,7 @@ static const struct gt_info hsw_gt1_info = {
(102 - 1) << HSW_PS_MAX_THREADS_SHIFT |
1 << HSW_PS_SAMPLE_MASK_SHIFT,
.urb = { 128, 640, 256, 8 },
.gt = 1,
};
static const struct gt_info hsw_gt2_info = {
@ -148,6 +155,7 @@ static const struct gt_info hsw_gt2_info = {
(140 - 1) << HSW_PS_MAX_THREADS_SHIFT |
1 << HSW_PS_SAMPLE_MASK_SHIFT,
.urb = { 256, 1664, 640, 8 },
.gt = 2,
};
static const struct gt_info hsw_gt3_info = {
@ -158,6 +166,7 @@ static const struct gt_info hsw_gt3_info = {
(280 - 1) << HSW_PS_MAX_THREADS_SHIFT |
1 << HSW_PS_SAMPLE_MASK_SHIFT,
.urb = { 512, 3328, 1280, 16 },
.gt = 3,
};
inline static bool is_ivb(struct sna *sna)
@ -2123,6 +2132,24 @@ inline static bool can_switch_to_blt(struct sna *sna,
return kgem_ring_is_idle(&sna->kgem, KGEM_BLT);
}
inline static bool can_switch_to_render(struct sna *sna,
struct kgem_bo *bo)
{
if (sna->kgem.ring == KGEM_RENDER)
return true;
if (NO_RING_SWITCH)
return false;
if (!sna->kgem.has_semaphores)
return false;
if (bo && !RQ_IS_BLT(bo->rq) && !(bo->scanout && !sna->kgem.has_wt))
return true;
return !kgem_ring_is_idle(&sna->kgem, KGEM_RENDER);
}
static inline bool untiled_tlb_miss(struct kgem_bo *bo)
{
return bo->tiling == I915_TILING_NONE && bo->pitch >= 4096;
@ -2143,6 +2170,15 @@ inline static bool prefer_blt_ring(struct sna *sna,
return can_switch_to_blt(sna, bo, flags);
}
inline static bool prefer_render_ring(struct sna *sna,
struct kgem_bo *bo)
{
if (sna->render_state.gen7.info->gt < 2)
return false;
return can_switch_to_render(sna, bo);
}
static bool
try_blt(struct sna *sna,
PicturePtr dst, PicturePtr src,
@ -2392,6 +2428,9 @@ prefer_blt_composite(struct sna *sna, struct sna_composite_op *tmp)
kgem_bo_is_render(tmp->src.bo))
return false;
if (prefer_render_ring(sna, tmp->dst.bo))
return false;
if (!prefer_blt_ring(sna, tmp->dst.bo, 0))
return false;
@ -2833,6 +2872,9 @@ static inline bool prefer_blt_copy(struct sna *sna,
kgem_bo_is_render(src_bo))
return false;
if (prefer_render_ring(sna, dst_bo))
return false;
if (!prefer_blt_ring(sna, dst_bo, flags))
return false;
@ -3238,6 +3280,9 @@ static inline bool prefer_blt_fill(struct sna *sna,
if (untiled_tlb_miss(bo))
return true;
if (prefer_render_ring(sna, bo))
return false;
if (!prefer_blt_ring(sna, bo, 0))
return false;