From 03ccf481980f8d3363263e73c64473d8f2779dc0 Mon Sep 17 00:00:00 2001 From: Monk Liu Date: Thu, 14 Jan 2016 19:07:38 +0800 Subject: [PATCH] drm/amdgpu: patch cond exec for SDMA MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit More ground work for conditional execution on SDMA necessary for preemption. Signed-off-by: Monk Liu Reviewed-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 4 ++++ drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 9 ++++++++- drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c | 25 +++++++++++++++++++++++++ 3 files changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 49adb451c3bc..412fc2f39fa5 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -302,6 +302,8 @@ struct amdgpu_ring_funcs { void (*insert_nop)(struct amdgpu_ring *ring, uint32_t count); /* pad the indirect buffer to the necessary number of dw */ void (*pad_ib)(struct amdgpu_ring *ring, struct amdgpu_ib *ib); + unsigned (*init_cond_exec)(struct amdgpu_ring *ring); + void (*patch_cond_exec)(struct amdgpu_ring *ring, unsigned offset); }; /* @@ -2182,6 +2184,8 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring) #define amdgpu_ring_emit_hdp_flush(r) (r)->funcs->emit_hdp_flush((r)) #define amdgpu_ring_emit_hdp_invalidate(r) (r)->funcs->emit_hdp_invalidate((r)) #define amdgpu_ring_pad_ib(r, ib) ((r)->funcs->pad_ib((r), (ib))) +#define amdgpu_ring_init_cond_exec(r) (r)->funcs->init_cond_exec((r)) +#define amdgpu_ring_patch_cond_exec(r,o) (r)->funcs->patch_cond_exec((r),(o)) #define amdgpu_ih_get_wptr(adev) (adev)->irq.ih_funcs->get_wptr((adev)) #define amdgpu_ih_decode_iv(adev, iv) (adev)->irq.ih_funcs->decode_iv((adev), (iv)) #define amdgpu_ih_set_rptr(adev) (adev)->irq.ih_funcs->set_rptr((adev)) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c index a15d690d9089..644336d76aca 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c @@ -124,7 +124,8 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs, struct amdgpu_ctx *ctx, *old_ctx; struct amdgpu_vm *vm; struct fence *hwf; - unsigned i; + unsigned i, patch_offset = ~0; + int r = 0; if (num_ibs == 0) @@ -149,6 +150,9 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs, return r; } + if (ring->type == AMDGPU_RING_TYPE_SDMA && ring->funcs->init_cond_exec) + patch_offset = amdgpu_ring_init_cond_exec(ring); + if (vm) { /* do context switch */ amdgpu_vm_flush(ring, ib->vm_id, ib->vm_pd_addr, @@ -204,6 +208,9 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs, if (f) *f = fence_get(hwf); + if (patch_offset != ~0 && ring->funcs->patch_cond_exec) + amdgpu_ring_patch_cond_exec(ring, patch_offset); + amdgpu_ring_commit(ring); return 0; } diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c index 8c8ca98dd129..833d2658428f 100644 --- a/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c @@ -452,6 +452,31 @@ static void sdma_v3_0_ring_emit_fence(struct amdgpu_ring *ring, u64 addr, u64 se amdgpu_ring_write(ring, SDMA_PKT_TRAP_INT_CONTEXT_INT_CONTEXT(0)); } +unsigned init_cond_exec(struct amdgpu_ring *ring) +{ + unsigned ret; + amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_COND_EXE)); + amdgpu_ring_write(ring, lower_32_bits(ring->cond_exe_gpu_addr)); + amdgpu_ring_write(ring, upper_32_bits(ring->cond_exe_gpu_addr)); + amdgpu_ring_write(ring, 1); + ret = ring->wptr;/* this is the offset we need patch later */ + amdgpu_ring_write(ring, 0x55aa55aa);/* insert dummy here and patch it later */ + return ret; +} + +void patch_cond_exec(struct amdgpu_ring *ring, unsigned offset) +{ + unsigned cur; + BUG_ON(ring->ring[offset] != 0x55aa55aa); + + cur = ring->wptr - 1; + if (likely(cur > offset)) + ring->ring[offset] = cur - offset; + else + ring->ring[offset] = (ring->ring_size>>2) - offset + cur; +} + + /** * sdma_v3_0_gfx_stop - stop the gfx async dma engines * -- 2.20.1