Wave limiting can be use to load balance high priority
compute jobs along with gfx jobs. When enabled, this will reserve
~75% of waves for compute jobs.
v2: Use amdgpu_ring_emit_wreg() in gfx8.
Updated comments.
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 1 +
drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 17 +++++++++++++++++
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 18 ++++++++++++++++++
3 files changed, 36 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 7112137689db..220eec886f23 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -197,6 +197,7 @@ struct amdgpu_ring_funcs {
void (*soft_recovery)(struct amdgpu_ring *ring, unsigned vmid);
int (*preempt_ib)(struct amdgpu_ring *ring);
void (*emit_mem_sync)(struct amdgpu_ring *ring);
+ void (*emit_wave_limit)(struct amdgpu_ring *ring, bool enable);
};
struct amdgpu_ring {
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index 37639214cbbb..40ae94b0a471 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -29,6 +29,7 @@
#include "amdgpu.h"
#include "amdgpu_gfx.h"
+#include "amdgpu_ring.h"
#include "vi.h"
#include "vi_structs.h"
#include "vid.h"
@@ -6847,6 +6848,21 @@ static void gfx_v8_0_emit_mem_sync_compute(struct amdgpu_ring *ring)
amdgpu_ring_write(ring, 0x0000000A); /* poll interval */
}
+#define mmSPI_WCL_PIPE_PERCENT_GFX_DEFAULT 0x07ffffff
+static void gfx_v8_0_emit_wave_limit(struct amdgpu_ring *ring, bool enable)
+{
+ struct amdgpu_device *adev = ring->adev;
+ uint32_t val;
+
+
+ /* mmSPI_WCL_PIPE_PERCENT_GFX is 7 bit multiplier register to limit
+ * number of gfx waves. Setting 5 bit will make sure gfx only gets
+ * around 25% of gpu resources.
+ */
+ val = enable ? 0x1f : mmSPI_WCL_PIPE_PERCENT_GFX_DEFAULT;
+ amdgpu_ring_emit_wreg(ring, mmSPI_WCL_PIPE_PERCENT_GFX, val);
+}
+
static const struct amd_ip_funcs gfx_v8_0_ip_funcs = {
.name = "gfx_v8_0",
.early_init = gfx_v8_0_early_init,
@@ -6944,6 +6960,7 @@ static const struct amdgpu_ring_funcs gfx_v8_0_ring_funcs_compute = {
.pad_ib = amdgpu_ring_generic_pad_ib,
.emit_wreg = gfx_v8_0_ring_emit_wreg,
.emit_mem_sync = gfx_v8_0_emit_mem_sync_compute,
+ .emit_wave_limit = gfx_v8_0_emit_wave_limit,
};
static const struct amdgpu_ring_funcs gfx_v8_0_ring_funcs_kiq = {
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index a896e3d0fcf8..64210544f9b2 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -52,6 +52,7 @@
#include "asic_reg/pwr/pwr_10_0_offset.h"
#include "asic_reg/pwr/pwr_10_0_sh_mask.h"
+#include "asic_reg/gc/gc_9_0_default.h"
#define GFX9_NUM_GFX_RINGS 1
#define GFX9_MEC_HPD_SIZE 4096
@@ -6670,6 +6671,22 @@ static void gfx_v9_0_emit_mem_sync(struct amdgpu_ring *ring)
amdgpu_ring_write(ring, 0x0000000A); /* POLL_INTERVAL */
}
+static void gfx_v9_0_emit_wave_limit(struct amdgpu_ring *ring, bool enable)
+{
+ struct amdgpu_device *adev = ring->adev;
+ uint32_t val;
+
+
+ /* mmSPI_WCL_PIPE_PERCENT_GFX is 7 bit multiplier register to limit
+ * number of gfx waves. Setting 5 bit will make sure gfx only gets
+ * around 25% of gpu resources.
+ */
+ val = enable ? 0x1f : mmSPI_WCL_PIPE_PERCENT_GFX_DEFAULT;
+ amdgpu_ring_emit_wreg(ring,
+ SOC15_REG_OFFSET(GC, 0, mmSPI_WCL_PIPE_PERCENT_GFX),
+ val);
+}
+
static const struct amd_ip_funcs gfx_v9_0_ip_funcs = {
.name = "gfx_v9_0",
.early_init = gfx_v9_0_early_init,
@@ -6775,6 +6792,7 @@ static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_compute = {
.emit_reg_wait = gfx_v9_0_ring_emit_reg_wait,
.emit_reg_write_reg_wait = gfx_v9_0_ring_emit_reg_write_reg_wait,
.emit_mem_sync = gfx_v9_0_emit_mem_sync,
+ .emit_wave_limit = gfx_v9_0_emit_wave_limit,
};
static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_kiq = {
--
2.30.0
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