Revert "drm/amdgpu: add pipeline sync while vmid switch in same ctx"

This reverts commit 2ba272d7bde27e1db2cf1c6cee49b01b7ea08989.

The issue fixed by this patch is specific to compute rings and the
previous patch was enough.  Additionally, this patch as been traced
to strange behavior on some CZ systems so we might as well drop it.

3 files changed, 6 insertions, 13 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 70af26d97d28..e055d5be1c3c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -799,7 +799,6 @@ struct amdgpu_ring {
         unsigned                cond_exe_offs;
         u64                             cond_exe_gpu_addr;
         volatile u32    *cond_exe_cpu_addr;
-        int                     vmid;
 };
 
 /*
@@ -937,8 +936,7 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring,
                     unsigned vm_id, uint64_t pd_addr,
                     uint32_t gds_base, uint32_t gds_size,
                     uint32_t gws_base, uint32_t gws_size,
-                    uint32_t oa_base, uint32_t oa_size,
-                    bool vmid_switch);
+                    uint32_t oa_base, uint32_t oa_size);
 void amdgpu_vm_reset_id(struct amdgpu_device *adev, unsigned vm_id);
 uint64_t amdgpu_vm_map_gart(const dma_addr_t *pages_addr, uint64_t addr);
 int amdgpu_vm_update_page_directory(struct amdgpu_device *adev,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
index 7a0b1e50f293..34e35423b78e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
@@ -122,7 +122,6 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
         bool skip_preamble, need_ctx_switch;
         unsigned patch_offset = ~0;
         struct amdgpu_vm *vm;
-        int vmid = 0, old_vmid = ring->vmid;
         struct fence *hwf;
         uint64_t ctx;
 
@@ -136,11 +135,9 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
         if (job) {
                 vm = job->vm;
                 ctx = job->ctx;
-                vmid = job->vm_id;
         } else {
                 vm = NULL;
                 ctx = 0;
-                vmid = 0;
         }
 
         if (!ring->ready) {
@@ -166,8 +163,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
                 r = amdgpu_vm_flush(ring, job->vm_id, job->vm_pd_addr,
                                     job->gds_base, job->gds_size,
                                     job->gws_base, job->gws_size,
-                                    job->oa_base, job->oa_size,
-                                    (ring->current_ctx == ctx) && (old_vmid != vmid));
+                                    job->oa_base, job->oa_size);
                 if (r) {
                         amdgpu_ring_undo(ring);
                         return r;
@@ -184,6 +180,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
         need_ctx_switch = ring->current_ctx != 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;
@@ -191,7 +188,6 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
                 amdgpu_ring_emit_ib(ring, ib, job ? job->vm_id : 0,
                                     need_ctx_switch);
                 need_ctx_switch = false;
-                ring->vmid = vmid;
         }
 
         if (ring->funcs->emit_hdp_invalidate)
@@ -202,7 +198,6 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
                 dev_err(adev->dev, "failed to emit fence (%d)\n", r);
                 if (job && job->vm_id)
                         amdgpu_vm_reset_id(adev, job->vm_id);
-                ring->vmid = old_vmid;
                 amdgpu_ring_undo(ring);
                 return r;
         }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 62a4c127620f..9f36ed30ba11 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -298,8 +298,7 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring,
                     unsigned vm_id, uint64_t pd_addr,
                     uint32_t gds_base, uint32_t gds_size,
                     uint32_t gws_base, uint32_t gws_size,
-                    uint32_t oa_base, uint32_t oa_size,
-                    bool vmid_switch)
+                    uint32_t oa_base, uint32_t oa_size)
 {
         struct amdgpu_device *adev = ring->adev;
         struct amdgpu_vm_id *id = &adev->vm_manager.ids[vm_id];
@@ -313,7 +312,8 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring,
         int r;
 
         if (ring->funcs->emit_pipeline_sync && (
-            pd_addr != AMDGPU_VM_NO_FLUSH || gds_switch_needed || vmid_switch))
+            pd_addr != AMDGPU_VM_NO_FLUSH || gds_switch_needed ||
+                    ring->type == AMDGPU_RING_TYPE_COMPUTE))
                 amdgpu_ring_emit_pipeline_sync(ring);
 
         if (ring->funcs->emit_vm_flush &&