From 20a5f5a98e1bb3d40acd97e89299e8c2d22784be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Thu, 22 Apr 2021 13:11:39 +0200
Subject: [PATCH] drm/amdgpu: fix concurrent VM flushes on Vega/Navi v2
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Starting with Vega the hardware supports concurrent flushes
of VMID which can be used to implement per process VMID
allocation.
But concurrent flushes are mutual exclusive with back to
back VMID allocations, fix this to avoid a VMID used in
two ways at the same time.
v2: don't set ring to NULL
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: James Zhu <James.Zhu@amd.com>
Tested-by: James Zhu <James.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c | 19 +++++++++++--------
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 6 ++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 1 +
3 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
index 94b069630db36..b4971e90b98cf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
@@ -215,7 +215,11 @@ static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
/* Check if we have an idle VMID */
i = 0;
list_for_each_entry((*idle), &id_mgr->ids_lru, list) {
- fences[i] = amdgpu_sync_peek_fence(&(*idle)->active, ring);
+ /* Don't use per engine and per process VMID at the same time */
+ struct amdgpu_ring *r = adev->vm_manager.concurrent_flush ?
+ NULL : ring;
+
+ fences[i] = amdgpu_sync_peek_fence(&(*idle)->active, r);
if (!fences[i])
break;
++i;
@@ -281,7 +285,7 @@ static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
if (updates && (*id)->flushed_updates &&
updates->context == (*id)->flushed_updates->context &&
!dma_fence_is_later(updates, (*id)->flushed_updates))
- updates = NULL;
+ updates = NULL;
if ((*id)->owner != vm->immediate.fence_context ||
job->vm_pd_addr != (*id)->pd_gpu_addr ||
@@ -290,6 +294,10 @@ static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
!dma_fence_is_signaled((*id)->last_flush))) {
struct dma_fence *tmp;
+ /* Don't use per engine and per process VMID at the same time */
+ if (adev->vm_manager.concurrent_flush)
+ ring = NULL;
+
/* to prevent one context starved by another context */
(*id)->pd_gpu_addr = 0;
tmp = amdgpu_sync_peek_fence(&(*id)->active, ring);
@@ -365,12 +373,7 @@ static int amdgpu_vmid_grab_used(struct amdgpu_vm *vm,
if (updates && (!flushed || dma_fence_is_later(updates, flushed)))
needs_flush = true;
- /* Concurrent flushes are only possible starting with Vega10 and
- * are broken on Navi10 and Navi14.
- */
- if (needs_flush && (adev->asic_type < CHIP_VEGA10 ||
- adev->asic_type == CHIP_NAVI10 ||
- adev->asic_type == CHIP_NAVI14))
+ if (needs_flush && !adev->vm_manager.concurrent_flush)
continue;
/* Good, we can use this VMID. Remember this submission as
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 0ffdf847cad0a..9acee4a5b2bad 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3148,6 +3148,12 @@ void amdgpu_vm_manager_init(struct amdgpu_device *adev)
{
unsigned i;
+ /* Concurrent flushes are only possible starting with Vega10 and
+ * are broken on Navi10 and Navi14.
+ */
+ adev->vm_manager.concurrent_flush = !(adev->asic_type < CHIP_VEGA10 ||
+ adev->asic_type == CHIP_NAVI10 ||
+ adev->asic_type == CHIP_NAVI14);
amdgpu_vmid_mgr_init(adev);
adev->vm_manager.fence_context =
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 976a12e5a8b92..4e140288159cd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -331,6 +331,7 @@ struct amdgpu_vm_manager {
/* Handling of VMIDs */
struct amdgpu_vmid_mgr id_mgr[AMDGPU_MAX_VMHUBS];
unsigned int first_kfd_vmid;
+ bool concurrent_flush;
/* Handling of VM fences */
u64 fence_context;
--
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