On 8/29/2024 9:17 AM, Prike Liang wrote:
> Implement the compute pipe reset, and the driver will
> fallback to pipe reset when queue reset fails.
> The pipe reset only deactivates the queue which is
> scheduled in the pipe, and meanwhile the MEC engine
> will be reset to the firmware _start pointer. So,
May refine this to indicate that reset to _start is for the specific
pipe and not applicable for the whole MEC engine.
> it seems pipe reset will cost more cycles than the
> queue reset; therefore, the driver tries to recover
> by doing queue reset first.
>
> Signed-off-by: Prike Liang <Prike.Liang@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c | 127 ++++++++++++++++++++----
> 1 file changed, 108 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
> index 2067f26d3a9d..26ae62d2a752 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
> @@ -3466,6 +3466,98 @@ static void gfx_v9_4_3_emit_wave_limit(struct amdgpu_ring *ring, bool enable)
> }
> }
>
> +static int gfx_v9_4_3_unmap_done(struct amdgpu_device *adev, uint32_t me,
> + uint32_t pipe, uint32_t queue,
> + uint32_t xcc_id)
> +{
> + int i, r;
> + /* make sure dequeue is complete*/
> + gfx_v9_4_3_xcc_set_safe_mode(adev, xcc_id);
> + mutex_lock(&adev->srbm_mutex);
> + soc15_grbm_select(adev, me, pipe, queue, 0, GET_INST(GC, xcc_id));
> + for (i = 0; i < adev->usec_timeout; i++) {
> + if (!(RREG32_SOC15(GC, GET_INST(GC, xcc_id), regCP_HQD_ACTIVE) & 1))
> + break;
> + udelay(1);
> + }
> + if (i >= adev->usec_timeout)
> + r = -ETIMEDOUT;
> + else
> + r = 0;
> + soc15_grbm_select(adev, 0, 0, 0, 0, GET_INST(GC, xcc_id));
> + mutex_unlock(&adev->srbm_mutex);
> + gfx_v9_4_3_xcc_unset_safe_mode(adev, xcc_id);
> +
> + return r;
> +
> +}
> +
> +static bool gfx_v9_4_3_pipe_reset_support(struct amdgpu_device *adev)
> +{
> + /*TODO: Need check gfx9.4.4 mec fw whether supports pipe reset as well.*/
> + if (amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(9, 4, 3) &&
> + adev->gfx.mec_fw_version >= 0x0000009b)
> + return true;
> + else
> + dev_warn_once(adev->dev, "Please use the latest MEC version to see whether support pipe reset\n");
> +
> + return false;
> +}
> +
> +static int gfx_v9_4_3_kiq_reset_hw_pipe(struct amdgpu_ring *ring)
Please drop the kiq name in this function to avoid confusion. It's not
restricted to kiq.
With those
Reviewed-by: Lijo Lazar <lijo.lazar@xxxxxxx>
Thanks,
Lijo
> +{
> + struct amdgpu_device *adev = ring->adev;
> + uint32_t reset_pipe, clean_pipe;
> + int r;
> +
> + if (!gfx_v9_4_3_pipe_reset_support(adev))
> + return -EINVAL;
> +
> + gfx_v9_4_3_xcc_set_safe_mode(adev, ring->xcc_id);
> + mutex_lock(&adev->srbm_mutex);
> +
> + reset_pipe = RREG32_SOC15(GC, GET_INST(GC, ring->xcc_id), regCP_MEC_CNTL);
> + clean_pipe = reset_pipe;
> +
> + if (ring->me == 1) {
> + switch (ring->pipe) {
> + case 0:
> + reset_pipe = REG_SET_FIELD(reset_pipe, CP_MEC_CNTL,
> + MEC_ME1_PIPE0_RESET, 1);
> + break;
> + case 1:
> + reset_pipe = REG_SET_FIELD(reset_pipe, CP_MEC_CNTL,
> + MEC_ME1_PIPE1_RESET, 1);
> + break;
> + case 2:
> + reset_pipe = REG_SET_FIELD(reset_pipe, CP_MEC_CNTL,
> + MEC_ME1_PIPE2_RESET, 1);
> + break;
> + case 3:
> + reset_pipe = REG_SET_FIELD(reset_pipe, CP_MEC_CNTL,
> + MEC_ME1_PIPE3_RESET, 1);
> + break;
> + default:
> + break;
> + }
> + } else {
> + if (ring->pipe)
> + reset_pipe = REG_SET_FIELD(reset_pipe, CP_MEC_CNTL,
> + MEC_ME2_PIPE1_RESET, 1);
> + else
> + reset_pipe = REG_SET_FIELD(reset_pipe, CP_MEC_CNTL,
> + MEC_ME2_PIPE0_RESET, 1);
> + }
> +
> + WREG32_SOC15(GC, GET_INST(GC, ring->xcc_id), regCP_MEC_CNTL, reset_pipe);
> + WREG32_SOC15(GC, GET_INST(GC, ring->xcc_id), regCP_MEC_CNTL, clean_pipe);
> + mutex_unlock(&adev->srbm_mutex);
> + gfx_v9_4_3_xcc_unset_safe_mode(adev, ring->xcc_id);
> +
> + r = gfx_v9_4_3_unmap_done(adev, ring->me, ring->pipe, ring->queue, ring->xcc_id);
> + return r;
> +}
> +
> static int gfx_v9_4_3_reset_kcq(struct amdgpu_ring *ring,
> unsigned int vmid)
> {
> @@ -3473,7 +3565,7 @@ static int gfx_v9_4_3_reset_kcq(struct amdgpu_ring *ring,
> struct amdgpu_kiq *kiq = &adev->gfx.kiq[ring->xcc_id];
> struct amdgpu_ring *kiq_ring = &kiq->ring;
> unsigned long flags;
> - int r, i;
> + int r;
>
> if (amdgpu_sriov_vf(adev))
> return -EINVAL;
> @@ -3495,26 +3587,23 @@ static int gfx_v9_4_3_reset_kcq(struct amdgpu_ring *ring,
> spin_unlock_irqrestore(&kiq->ring_lock, flags);
>
> r = amdgpu_ring_test_ring(kiq_ring);
> + if (r) {
> + dev_err(adev->dev, "kiq ring test failed after ring: %s queue reset\n",
> + ring->name);
> + goto pipe_reset;
> + }
> +
> + r = gfx_v9_4_3_unmap_done(adev, ring->me, ring->pipe, ring->queue, ring->xcc_id);
> if (r)
> - return r;
> + dev_err(adev->dev, "fail to wait on hqd deactive and will try pipe reset\n");
>
> - /* make sure dequeue is complete*/
> - amdgpu_gfx_rlc_enter_safe_mode(adev, ring->xcc_id);
> - mutex_lock(&adev->srbm_mutex);
> - soc15_grbm_select(adev, ring->me, ring->pipe, ring->queue, 0, GET_INST(GC, ring->xcc_id));
> - for (i = 0; i < adev->usec_timeout; i++) {
> - if (!(RREG32_SOC15(GC, 0, regCP_HQD_ACTIVE) & 1))
> - break;
> - udelay(1);
> - }
> - if (i >= adev->usec_timeout)
> - r = -ETIMEDOUT;
> - soc15_grbm_select(adev, 0, 0, 0, 0, GET_INST(GC, ring->xcc_id));
> - mutex_unlock(&adev->srbm_mutex);
> - amdgpu_gfx_rlc_exit_safe_mode(adev, ring->xcc_id);
> - if (r) {
> - dev_err(adev->dev, "fail to wait on hqd deactive\n");
> - return r;
> +pipe_reset:
> + if(r) {
> + r = gfx_v9_4_3_kiq_reset_hw_pipe(ring);
> + dev_info(adev->dev, "ring: %s pipe reset :%s\n", ring->name,
> + r ? "failed" : "successfully");
> + if (r)
> + return r;
> }
>
> r = amdgpu_bo_reserve(ring->mqd_obj, false);
