[PATCH 1/2] drm/amdgpu: fix transform feedback GDS hang on gfx10 (v2)

[Christian König]

Am 27.06.19 um 00:35 schrieb Marek Olšák:
> From: Marek Olšák <marek.olsak at amd.com>
>
> v2: update emit_ib_size
> (though it's still wrong because it was wrong before)
>
> Signed-off-by: Marek Olšák <marek.olsak at amd.com>

Can't judge if this is really the right thing to do because I don't know 
the details of the hw bug.

But at least of hand I can't see any obvious problems with it, so feel 
free to add an Acked-by: Christian König <christian.koenig at amd.com> to 
the series.

Regards,
Christian.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_gds.h |  3 ++-
>   drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c  | 14 +++++++++++---
>   2 files changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gds.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gds.h
> index dad2186f4ed5..df8a23554831 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gds.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gds.h
> @@ -24,21 +24,22 @@
>   #ifndef __AMDGPU_GDS_H__
>   #define __AMDGPU_GDS_H__
>   
>   struct amdgpu_ring;
>   struct amdgpu_bo;
>   
>   struct amdgpu_gds {
>   	uint32_t gds_size;
>   	uint32_t gws_size;
>   	uint32_t oa_size;
> -	uint32_t			gds_compute_max_wave_id;
> +	uint32_t gds_compute_max_wave_id;
> +	uint32_t vgt_gs_max_wave_id;
>   };
>   
>   struct amdgpu_gds_reg_offset {
>   	uint32_t	mem_base;
>   	uint32_t	mem_size;
>   	uint32_t	gws;
>   	uint32_t	oa;
>   };
>   
>   #endif /* __AMDGPU_GDS_H__ */
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> index 16b2bcc590e7..6baaa65a1daa 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
> @@ -4211,20 +4211,29 @@ static void gfx_v10_0_ring_emit_hdp_flush(struct amdgpu_ring *ring)
>   }
>   
>   static void gfx_v10_0_ring_emit_ib_gfx(struct amdgpu_ring *ring,
>   				       struct amdgpu_job *job,
>   				       struct amdgpu_ib *ib,
>   				       uint32_t flags)
>   {
>   	unsigned vmid = AMDGPU_JOB_GET_VMID(job);
>   	u32 header, control = 0;
>   
> +	/* Prevent a hw deadlock due to a wave ID mismatch between ME and GDS.
> +	 * This resets the wave ID counters. (needed by transform feedback)
> +	 * TODO: This might only be needed on a VMID switch when we change
> +	 *       the GDS OA mapping, not sure.
> +	 */
> +	amdgpu_ring_write(ring, PACKET3(PACKET3_SET_CONFIG_REG, 1));
> +	amdgpu_ring_write(ring, mmVGT_GS_MAX_WAVE_ID);
> +	amdgpu_ring_write(ring, ring->adev->gds.vgt_gs_max_wave_id);
> +
>   	if (ib->flags & AMDGPU_IB_FLAG_CE)
>   		header = PACKET3(PACKET3_INDIRECT_BUFFER_CNST, 2);
>   	else
>   		header = PACKET3(PACKET3_INDIRECT_BUFFER, 2);
>   
>   	control |= ib->length_dw | (vmid << 24);
>   
>   	if (amdgpu_mcbp && (ib->flags & AMDGPU_IB_FLAG_PREEMPT)) {
>   		control |= INDIRECT_BUFFER_PRE_ENB(1);
>   
> @@ -4944,21 +4953,21 @@ static const struct amdgpu_ring_funcs gfx_v10_0_ring_funcs_gfx = {
>   		     */
>   		5 + /* COND_EXEC */
>   		7 + /* HDP_flush */
>   		4 + /* VGT_flush */
>   		14 + /*	CE_META */
>   		31 + /*	DE_META */
>   		3 + /* CNTX_CTRL */
>   		5 + /* HDP_INVL */
>   		8 + 8 + /* FENCE x2 */
>   		2, /* SWITCH_BUFFER */
> -	.emit_ib_size =	4, /* gfx_v10_0_ring_emit_ib_gfx */
> +	.emit_ib_size =	7, /* gfx_v10_0_ring_emit_ib_gfx */
>   	.emit_ib = gfx_v10_0_ring_emit_ib_gfx,
>   	.emit_fence = gfx_v10_0_ring_emit_fence,
>   	.emit_pipeline_sync = gfx_v10_0_ring_emit_pipeline_sync,
>   	.emit_vm_flush = gfx_v10_0_ring_emit_vm_flush,
>   	.emit_gds_switch = gfx_v10_0_ring_emit_gds_switch,
>   	.emit_hdp_flush = gfx_v10_0_ring_emit_hdp_flush,
>   	.test_ring = gfx_v10_0_ring_test_ring,
>   	.test_ib = gfx_v10_0_ring_test_ib,
>   	.insert_nop = amdgpu_ring_insert_nop,
>   	.pad_ib = amdgpu_ring_generic_pad_ib,
> @@ -5092,24 +5101,23 @@ static void gfx_v10_0_set_rlc_funcs(struct amdgpu_device *adev)
>   	default:
>   		break;
>   	}
>   }
>   
>   static void gfx_v10_0_set_gds_init(struct amdgpu_device *adev)
>   {
>   	/* init asic gds info */
>   	switch (adev->asic_type) {
>   	case CHIP_NAVI10:
> -		adev->gds.gds_size = 0x10000;
> -		break;
>   	default:
>   		adev->gds.gds_size = 0x10000;
> +		adev->gds.vgt_gs_max_wave_id = 0x3ff;
>   		break;
>   	}
>   
>   	adev->gds.gws_size = 64;
>   	adev->gds.oa_size = 16;
>   }
>   
>   static void gfx_v10_0_set_user_wgp_inactive_bitmap_per_sh(struct amdgpu_device *adev,
>   							  u32 bitmap)
>   {