drm/amdgpu: move context switch handling into common code v2

It was a source of bugs to repeat that in each IP version.

v2: rename parameter

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -283,7 +283,7 @@ struct amdgpu_ring_funcs {
 	int (*parse_cs)(struct amdgpu_cs_parser *p, uint32_t ib_idx);
 	/* command emit functions */
 	void (*emit_ib)(struct amdgpu_ring *ring,
-			struct amdgpu_ib *ib);
+			struct amdgpu_ib *ib, bool ctx_switch);
 	void (*emit_fence)(struct amdgpu_ring *ring, uint64_t addr,
 			   uint64_t seq, unsigned flags);
 	void (*emit_pipeline_sync)(struct amdgpu_ring *ring);
@@ -2221,7 +2221,7 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
 #define amdgpu_ring_get_rptr(r) (r)->funcs->get_rptr((r))
 #define amdgpu_ring_get_wptr(r) (r)->funcs->get_wptr((r))
 #define amdgpu_ring_set_wptr(r) (r)->funcs->set_wptr((r))
-#define amdgpu_ring_emit_ib(r, ib) (r)->funcs->emit_ib((r), (ib))
+#define amdgpu_ring_emit_ib(r, ib, c) (r)->funcs->emit_ib((r), (ib), (c))
 #define amdgpu_ring_emit_pipeline_sync(r) (r)->funcs->emit_pipeline_sync((r))
 #define amdgpu_ring_emit_vm_flush(r, vmid, addr) (r)->funcs->emit_vm_flush((r), (vmid), (addr))
 #define amdgpu_ring_emit_fence(r, addr, seq, flags) (r)->funcs->emit_fence((r), (addr), (seq), (flags))

drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c

@@ -121,18 +121,16 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 {
 	struct amdgpu_device *adev = ring->adev;
 	struct amdgpu_ib *ib = &ibs[0];
-	uint64_t ctx, old_ctx;
 	struct fence *hwf;
 	struct amdgpu_vm *vm = NULL;
 	unsigned i, patch_offset = ~0;
-	bool skip_preamble;
+	bool skip_preamble, need_ctx_switch;
 
 	int r = 0;
 
 	if (num_ibs == 0)
 		return -EINVAL;
 
-	ctx = ibs->ctx;
 	if (job) /* for domain0 job like ring test, ibs->job is not assigned */
 		vm = job->vm;
 
@@ -156,7 +154,6 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 		patch_offset = amdgpu_ring_init_cond_exec(ring);
 
 	if (vm) {
-		/* do context switch */
 		r = amdgpu_vm_flush(ring, ib->vm_id, ib->vm_pd_addr,
 				    ib->gds_base, ib->gds_size,
 				    ib->gws_base, ib->gws_size,
@@ -173,16 +170,17 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 	/* always set cond_exec_polling to CONTINUE */
 	*ring->cond_exe_cpu_addr = 1;
 
-	skip_preamble = ring->current_ctx == ctx;
-	old_ctx = ring->current_ctx;
+	skip_preamble = ring->current_ctx == ib->ctx;
+	need_ctx_switch = ring->current_ctx != ib->ctx;
 	for (i = 0; i < num_ibs; ++i) {
+		ib = &ibs[i];
 
 		/* drop preamble IBs if we don't have a context switch */
 		if ((ib->flags & AMDGPU_IB_FLAG_PREAMBLE) && skip_preamble)
 			continue;
 
-		amdgpu_ring_emit_ib(ring, ib);
-		ring->current_ctx = ctx;
+		amdgpu_ring_emit_ib(ring, ib, need_ctx_switch);
+		need_ctx_switch = false;
 	}
 
 	if (ring->funcs->emit_hdp_invalidate)
@@ -191,7 +189,6 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 	r = amdgpu_fence_emit(ring, &hwf);
 	if (r) {
 		dev_err(adev->dev, "failed to emit fence (%d)\n", r);
-		ring->current_ctx = old_ctx;
 		if (ib->vm_id)
 			amdgpu_vm_reset_id(adev, ib->vm_id);
 		amdgpu_ring_undo(ring);
@@ -212,6 +209,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 	if (patch_offset != ~0 && ring->funcs->patch_cond_exec)
 		amdgpu_ring_patch_cond_exec(ring, patch_offset);
 
+	ring->current_ctx = ibs->ctx;
 	amdgpu_ring_commit(ring);
 	return 0;
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c

@@ -762,7 +762,7 @@ int amdgpu_vce_ring_parse_cs(struct amdgpu_cs_parser *p, uint32_t ib_idx)
  * @ib: the IB to execute
  *
  */
-void amdgpu_vce_ring_emit_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)
+void amdgpu_vce_ring_emit_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib, bool ctx_switch)
 {
 	amdgpu_ring_write(ring, VCE_CMD_IB);
 	amdgpu_ring_write(ring, lower_32_bits(ib->gpu_addr));

drivers/gpu/drm/amd/amdgpu/amdgpu_vce.h

@@ -34,7 +34,7 @@ int amdgpu_vce_get_destroy_msg(struct amdgpu_ring *ring, uint32_t handle,
 			       bool direct, struct fence **fence);
 void amdgpu_vce_free_handles(struct amdgpu_device *adev, struct drm_file *filp);
 int amdgpu_vce_ring_parse_cs(struct amdgpu_cs_parser *p, uint32_t ib_idx);
-void amdgpu_vce_ring_emit_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib);
+void amdgpu_vce_ring_emit_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib, bool ctx_switch);
 void amdgpu_vce_ring_emit_fence(struct amdgpu_ring *ring, u64 addr, u64 seq,
 				unsigned flags);
 int amdgpu_vce_ring_test_ring(struct amdgpu_ring *ring);

drivers/gpu/drm/amd/amdgpu/cik_sdma.c

@@ -210,7 +210,7 @@ static void cik_sdma_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
  * Schedule an IB in the DMA ring (CIK).
  */
 static void cik_sdma_ring_emit_ib(struct amdgpu_ring *ring,
-			   struct amdgpu_ib *ib)
+			   struct amdgpu_ib *ib, bool ctx_switch)
 {
 	u32 extra_bits = ib->vm_id & 0xf;
 	u32 next_rptr = ring->wptr + 5;

drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c

@@ -2030,13 +2030,12 @@ static void gfx_v7_0_ring_emit_fence_compute(struct amdgpu_ring *ring,
  * on the gfx ring for execution by the GPU.
  */
 static void gfx_v7_0_ring_emit_ib_gfx(struct amdgpu_ring *ring,
-				  struct amdgpu_ib *ib)
+				      struct amdgpu_ib *ib, bool ctx_switch)
 {
-	bool need_ctx_switch = ring->current_ctx != ib->ctx;
 	u32 header, control = 0;
 	u32 next_rptr = ring->wptr + 5;
 
-	if (need_ctx_switch)
+	if (ctx_switch)
 		next_rptr += 2;
 
 	next_rptr += 4;
@@ -2047,7 +2046,7 @@ static void gfx_v7_0_ring_emit_ib_gfx(struct amdgpu_ring *ring,
 	amdgpu_ring_write(ring, next_rptr);
 
 	/* insert SWITCH_BUFFER packet before first IB in the ring frame */
-	if (need_ctx_switch) {
+	if (ctx_switch) {
 		amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
 		amdgpu_ring_write(ring, 0);
 	}
@@ -2070,7 +2069,7 @@ static void gfx_v7_0_ring_emit_ib_gfx(struct amdgpu_ring *ring,
 }
 
 static void gfx_v7_0_ring_emit_ib_compute(struct amdgpu_ring *ring,
-				  struct amdgpu_ib *ib)
+					  struct amdgpu_ib *ib, bool ctx_switch)
 {
 	u32 header, control = 0;
 	u32 next_rptr = ring->wptr + 5;

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -5646,13 +5646,12 @@ static void gfx_v8_0_ring_emit_hdp_invalidate(struct amdgpu_ring *ring)
 }
 
 static void gfx_v8_0_ring_emit_ib_gfx(struct amdgpu_ring *ring,
-				  struct amdgpu_ib *ib)
+				      struct amdgpu_ib *ib, bool ctx_switch)
 {
-	bool need_ctx_switch = ring->current_ctx != ib->ctx;
 	u32 header, control = 0;
 	u32 next_rptr = ring->wptr + 5;
 
-	if (need_ctx_switch)
+	if (ctx_switch)
 		next_rptr += 2;
 
 	next_rptr += 4;
@@ -5663,7 +5662,7 @@ static void gfx_v8_0_ring_emit_ib_gfx(struct amdgpu_ring *ring,
 	amdgpu_ring_write(ring, next_rptr);
 
 	/* insert SWITCH_BUFFER packet before first IB in the ring frame */
-	if (need_ctx_switch) {
+	if (ctx_switch) {
 		amdgpu_ring_write(ring, PACKET3(PACKET3_SWITCH_BUFFER, 0));
 		amdgpu_ring_write(ring, 0);
 	}
@@ -5686,7 +5685,7 @@ static void gfx_v8_0_ring_emit_ib_gfx(struct amdgpu_ring *ring,
 }
 
 static void gfx_v8_0_ring_emit_ib_compute(struct amdgpu_ring *ring,
-				  struct amdgpu_ib *ib)
+					  struct amdgpu_ib *ib, bool ctx_switch)
 {
 	u32 header, control = 0;
 	u32 next_rptr = ring->wptr + 5;

drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c

@@ -242,7 +242,7 @@ static void sdma_v2_4_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
  * Schedule an IB in the DMA ring (VI).
  */
 static void sdma_v2_4_ring_emit_ib(struct amdgpu_ring *ring,
-				   struct amdgpu_ib *ib)
+				   struct amdgpu_ib *ib, bool ctx_switch)
 {
 	u32 vmid = ib->vm_id & 0xf;
 	u32 next_rptr = ring->wptr + 5;

drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c

@@ -400,7 +400,7 @@ static void sdma_v3_0_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
  * Schedule an IB in the DMA ring (VI).
  */
 static void sdma_v3_0_ring_emit_ib(struct amdgpu_ring *ring,
-				   struct amdgpu_ib *ib)
+				   struct amdgpu_ib *ib, bool ctx_switch)
 {
 	u32 vmid = ib->vm_id & 0xf;
 	u32 next_rptr = ring->wptr + 5;

drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c

@@ -489,7 +489,7 @@ static int uvd_v4_2_ring_test_ring(struct amdgpu_ring *ring)
  * Write ring commands to execute the indirect buffer
  */
 static void uvd_v4_2_ring_emit_ib(struct amdgpu_ring *ring,
-				  struct amdgpu_ib *ib)
+				  struct amdgpu_ib *ib, bool ctx_switch)
 {
 	amdgpu_ring_write(ring, PACKET0(mmUVD_RBC_IB_BASE, 0));
 	amdgpu_ring_write(ring, ib->gpu_addr);

drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c

@@ -539,7 +539,7 @@ static int uvd_v5_0_ring_test_ring(struct amdgpu_ring *ring)
  * Write ring commands to execute the indirect buffer
  */
 static void uvd_v5_0_ring_emit_ib(struct amdgpu_ring *ring,
-				  struct amdgpu_ib *ib)
+				  struct amdgpu_ib *ib, bool ctx_switch)
 {
 	amdgpu_ring_write(ring, PACKET0(mmUVD_LMI_RBC_IB_64BIT_BAR_LOW, 0));
 	amdgpu_ring_write(ring, lower_32_bits(ib->gpu_addr));

drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c

@@ -631,7 +631,7 @@ static int uvd_v6_0_ring_test_ring(struct amdgpu_ring *ring)
  * Write ring commands to execute the indirect buffer
  */
 static void uvd_v6_0_ring_emit_ib(struct amdgpu_ring *ring,
-				  struct amdgpu_ib *ib)
+				  struct amdgpu_ib *ib, bool ctx_switch)
 {
 	amdgpu_ring_write(ring, PACKET0(mmUVD_LMI_RBC_IB_64BIT_BAR_LOW, 0));
 	amdgpu_ring_write(ring, lower_32_bits(ib->gpu_addr));