[PATCH 1/1] drm/amdgpu: enable wave limit on non high prio cs pipes
Alex Deucher
alexdeucher at gmail.com
Wed Feb 3 16:56:55 UTC 2021
On Wed, Feb 3, 2021 at 11:07 AM Nirmoy Das <nirmoy.das at amd.com> wrote:
>
> To achieve the best QoS for high priority compute jobs it is
> required to limit waves on other compute pipes as well.
> This patch will set min value in non high priority
> mmSPI_WCL_PIPE_PERCENT_CS[0-3] registers to minimize the
> impact of normal/low priority compute jobs over high priority
> compute jobs.
>
> Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 49 ++++++++++++++++++++++++++-
> drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 46 ++++++++++++++++++++++++-
> 2 files changed, 93 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> index bdfd29a22b3d..28dbce1083ab 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> @@ -6846,10 +6846,44 @@ static void gfx_v8_0_emit_mem_sync_compute(struct amdgpu_ring *ring)
> amdgpu_ring_write(ring, 0x0000000A); /* poll interval */
> }
>
> +
> +/* mmSPI_WCL_PIPE_PERCENT_CS[0-7]_DEFAULT values are same */
> +#define mmSPI_WCL_PIPE_PERCENT_CS_DEFAULT 0x0000007f
> +static void gfx_v8_0_emit_wave_limit_cs(struct amdgpu_ring *ring,
> + uint32_t pipe, bool enable)
> +{
> + uint32_t val;
> + uint32_t wcl_cs_reg;
> +
> + val = enable ? 0x1 : mmSPI_WCL_PIPE_PERCENT_CS_DEFAULT;
> +
> + switch (pipe) {
> + case 0:
> + wcl_cs_reg = mmSPI_WCL_PIPE_PERCENT_CS0;
> + break;
> + case 1:
> + wcl_cs_reg = mmSPI_WCL_PIPE_PERCENT_CS1;
> + break;
> + case 2:
> + wcl_cs_reg = mmSPI_WCL_PIPE_PERCENT_CS2;
> + break;
> + case 3:
> + wcl_cs_reg = mmSPI_WCL_PIPE_PERCENT_CS3;
> + break;
> + default:
> + DRM_DEBUG("invalid pipe %d\n", pipe);
> + return;
> + }
> +
> + amdgpu_ring_emit_wreg(ring, wcl_cs_reg, val);
> +
> +}
> +
> #define mmSPI_WCL_PIPE_PERCENT_GFX_DEFAULT 0x07ffffff
> static void gfx_v8_0_emit_wave_limit(struct amdgpu_ring *ring, bool enable)
> {
> uint32_t val;
> + int i;
>
> /* 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
> @@ -6857,6 +6891,18 @@ static void gfx_v8_0_emit_wave_limit(struct amdgpu_ring *ring, bool enable)
> */
> val = enable ? 0x1f : mmSPI_WCL_PIPE_PERCENT_GFX_DEFAULT;
> amdgpu_ring_emit_wreg(ring, mmSPI_WCL_PIPE_PERCENT_GFX, val);
> +
> + /* Restrict waves for normal/low priority compute queues as well
> + * to get best QoS for high priority compute jobs.
> + *
> + * amdgpu controls only 1st ME(0-3 CS pipes).
> + */
> + for (i = 0; i < 4; i++) {
How about using adev->gfx.mec.num_pipe_per_mec instead of hardcoding 4 here?
> + if (i != ring->pipe)
> + gfx_v8_0_emit_wave_limit_cs(ring, i, enable);
> +
> + }
> +
> }
>
> static const struct amd_ip_funcs gfx_v8_0_ip_funcs = {
> @@ -6943,7 +6989,8 @@ static const struct amdgpu_ring_funcs gfx_v8_0_ring_funcs_compute = {
> VI_FLUSH_GPU_TLB_NUM_WREG * 5 + 7 + /* gfx_v8_0_ring_emit_vm_flush */
> 7 + 7 + 7 + /* gfx_v8_0_ring_emit_fence_compute x3 for user fence, vm fence */
> 7 + /* gfx_v8_0_emit_mem_sync_compute */
> - 5, /* gfx_v8_0_emit_wave_limit for updating mmSPI_WCL_PIPE_PERCENT_GFX register */
> + 5 + /* gfx_v8_0_emit_wave_limit for updating mmSPI_WCL_PIPE_PERCENT_GFX register */
> + 15, /* for updating 3 mmSPI_WCL_PIPE_PERCENT_CS registers */
> .emit_ib_size = 7, /* gfx_v8_0_ring_emit_ib_compute */
> .emit_ib = gfx_v8_0_ring_emit_ib_compute,
> .emit_fence = gfx_v8_0_ring_emit_fence_compute,
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> index 027997e95e46..e44487ae15dc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> @@ -6668,10 +6668,42 @@ 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_cs(struct amdgpu_ring *ring,
> + uint32_t pipe, bool enable)
> +{
> + struct amdgpu_device *adev = ring->adev;
> + uint32_t val;
> + uint32_t wcl_cs_reg;
> +
> + /* mmSPI_WCL_PIPE_PERCENT_CS[0-7]_DEFAULT values are same */
> + val = enable ? 0x1 : mmSPI_WCL_PIPE_PERCENT_CS0_DEFAULT;
> +
> + switch (pipe) {
> + case 0:
> + wcl_cs_reg = SOC15_REG_OFFSET(GC, 0, mmSPI_WCL_PIPE_PERCENT_CS0);
> + break;
> + case 1:
> + wcl_cs_reg = SOC15_REG_OFFSET(GC, 0, mmSPI_WCL_PIPE_PERCENT_CS1);
> + break;
> + case 2:
> + wcl_cs_reg = SOC15_REG_OFFSET(GC, 0, mmSPI_WCL_PIPE_PERCENT_CS2);
> + break;
> + case 3:
> + wcl_cs_reg = SOC15_REG_OFFSET(GC, 0, mmSPI_WCL_PIPE_PERCENT_CS3);
> + break;
> + default:
> + DRM_DEBUG("invalid pipe %d\n", pipe);
> + return;
> + }
> +
> + amdgpu_ring_emit_wreg(ring, wcl_cs_reg, val);
> +
> +}
> static void gfx_v9_0_emit_wave_limit(struct amdgpu_ring *ring, bool enable)
> {
> struct amdgpu_device *adev = ring->adev;
> uint32_t val;
> + int i;
>
>
> /* mmSPI_WCL_PIPE_PERCENT_GFX is 7 bit multiplier register to limit
> @@ -6682,6 +6714,17 @@ static void gfx_v9_0_emit_wave_limit(struct amdgpu_ring *ring, bool enable)
> amdgpu_ring_emit_wreg(ring,
> SOC15_REG_OFFSET(GC, 0, mmSPI_WCL_PIPE_PERCENT_GFX),
> val);
> +
> + /* Restrict waves for normal/low priority compute queues as well
> + * to get best QoS for high priority compute jobs.
> + *
> + * amdgpu controls only 1st ME(0-3 CS pipes).
> + */
> + for (i = 0; i < 4; i++) {
Same comment here.
> + if (i != ring->pipe)
> + gfx_v9_0_emit_wave_limit_cs(ring, i, enable);
> +
> + }
> }
>
> static const struct amd_ip_funcs gfx_v9_0_ip_funcs = {
> @@ -6774,7 +6817,8 @@ static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_compute = {
> 2 + /* gfx_v9_0_ring_emit_vm_flush */
> 8 + 8 + 8 + /* gfx_v9_0_ring_emit_fence x3 for user fence, vm fence */
> 7 + /* gfx_v9_0_emit_mem_sync */
> - 5, /* gfx_v9_0_emit_wave_limit for updating mmSPI_WCL_PIPE_PERCENT_GFX register */
> + 5 + /* gfx_v9_0_emit_wave_limit for updating mmSPI_WCL_PIPE_PERCENT_GFX register */
> + 15, /* for updating 3 mmSPI_WCL_PIPE_PERCENT_CS registers */
> .emit_ib_size = 7, /* gfx_v9_0_ring_emit_ib_compute */
> .emit_ib = gfx_v9_0_ring_emit_ib_compute,
> .emit_fence = gfx_v9_0_ring_emit_fence,
> --
> 2.30.0
>
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