Am 08.09.23 um 18:04 schrieb Shashank Sharma:
To support oversubscription, MES FW expects WPTR BOs to
be mapped into GART, before they are submitted to usermode
queues. This patch adds a function for the same.
V4: fix the wptr value before mapping lookup (Bas, Christian).
V5: Addressed review comments from Christian:
- Either pin object or allocate from GART, but not both.
- All the handling must be done with the VM locks held.
Cc: Alex Deucher <alexander.deuc...@amd.com>
Cc: Christian Koenig <christian.koe...@amd.com>
Signed-off-by: Shashank Sharma <shashank.sha...@amd.com>
Signed-off-by: Arvind Yadav <arvind.ya...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c | 81 +++++++++++++++++++
.../gpu/drm/amd/include/amdgpu_userqueue.h | 1 +
2 files changed, 82 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
index e266674e0d44..c0eb622dfc37 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
@@ -6427,6 +6427,79 @@ const struct amdgpu_ip_block_version gfx_v11_0_ip_block =
.funcs = &gfx_v11_0_ip_funcs,
};
+static int
+gfx_v11_0_map_gtt_bo_to_gart(struct amdgpu_device *adev, struct amdgpu_bo *bo)
+{
+ int ret;
+
+ ret = amdgpu_bo_reserve(bo, true);
+ if (ret) {
+ DRM_ERROR("Failed to reserve bo. ret %d\n", ret);
+ goto err_reserve_bo_failed;
+ }
+
+ ret = amdgpu_ttm_alloc_gart(&bo->tbo);
+ if (ret) {
+ DRM_ERROR("Failed to bind bo to GART. ret %d\n", ret);
+ goto err_map_bo_gart_failed;
+ }
+
+ amdgpu_bo_unreserve(bo);
The GART mapping can become invalid as soon as you unlock the BOs.
You need to attach an eviction fence for this to work correctly.
+ bo = amdgpu_bo_ref(bo);
+
+ return 0;
+
+err_map_bo_gart_failed:
+ amdgpu_bo_unreserve(bo);
+err_reserve_bo_failed:
+ return ret;
+}
+
+static int
+gfx_v11_0_create_wptr_mapping(struct amdgpu_device *adev,
+ struct amdgpu_usermode_queue *queue,
+ uint64_t wptr)
+{
+ struct amdgpu_bo_va_mapping *wptr_mapping;
+ struct amdgpu_vm *wptr_vm;
+ struct amdgpu_bo *wptr_bo = NULL;
+ int ret;
+
+ mutex_lock(&queue->vm->eviction_lock);
Never ever touch the eviction lock outside of the VM code! That lock is
completely unrelated to what you do here.
+ wptr_vm = queue->vm;
+ ret = amdgpu_bo_reserve(wptr_vm->root.bo, false);
+ if (ret)
+ goto unlock;
+
+ wptr &= AMDGPU_GMC_HOLE_MASK;
+ wptr_mapping = amdgpu_vm_bo_lookup_mapping(wptr_vm, wptr >> PAGE_SHIFT);
+ amdgpu_bo_unreserve(wptr_vm->root.bo);
+ if (!wptr_mapping) {
+ DRM_ERROR("Failed to lookup wptr bo\n");
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ wptr_bo = wptr_mapping->bo_va->base.bo;
+ if (wptr_bo->tbo.base.size > PAGE_SIZE) {
+ DRM_ERROR("Requested GART mapping for wptr bo larger than one
page\n");
+ ret = -EINVAL;
+ goto unlock;
+ }
We probably also want to enforce that this BO is a per VM BO.
+
+ ret = gfx_v11_0_map_gtt_bo_to_gart(adev, wptr_bo);
+ if (ret) {
+ DRM_ERROR("Failed to map wptr bo to GART\n");
+ goto unlock;
+ }
+
+ queue->wptr_mc_addr = wptr_bo->tbo.resource->start << PAGE_SHIFT;
This needs to be amdgpu_bo_gpu_offset() instead.
Regards,
Christian.
+
+unlock:
+ mutex_unlock(&queue->vm->eviction_lock);
+ return ret;
+}
+
static void gfx_v11_0_userq_unmap(struct amdgpu_userq_mgr *uq_mgr,
struct amdgpu_usermode_queue *queue)
{
@@ -6475,6 +6548,7 @@ static int gfx_v11_0_userq_map(struct amdgpu_userq_mgr
*uq_mgr,
queue_input.queue_size = userq_props->queue_size >> 2;
queue_input.doorbell_offset = userq_props->doorbell_index;
queue_input.page_table_base_addr =
amdgpu_gmc_pd_addr(queue->vm->root.bo);
+ queue_input.wptr_mc_addr = queue->wptr_mc_addr;
amdgpu_mes_lock(&adev->mes);
r = adev->mes.funcs->add_hw_queue(&adev->mes, &queue_input);
@@ -6601,6 +6675,13 @@ static int gfx_v11_0_userq_mqd_create(struct
amdgpu_userq_mgr *uq_mgr,
goto free_mqd;
}
+ /* FW expects WPTR BOs to be mapped into GART */
+ r = gfx_v11_0_create_wptr_mapping(adev, queue,
userq_props.wptr_gpu_addr);
+ if (r) {
+ DRM_ERROR("Failed to create WPTR mapping\n");
+ goto free_ctx;
+ }
+
/* Map userqueue into FW using MES */
r = gfx_v11_0_userq_map(uq_mgr, queue, &userq_props);
if (r) {
diff --git a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
index 34e20daa06c8..ae155de62560 100644
--- a/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
+++ b/drivers/gpu/drm/amd/include/amdgpu_userqueue.h
@@ -39,6 +39,7 @@ struct amdgpu_usermode_queue {
int queue_type;
uint64_t doorbell_handle;
uint64_t doorbell_index;
+ uint64_t wptr_mc_addr;
uint64_t flags;
struct amdgpu_mqd_prop *userq_prop;
struct amdgpu_userq_mgr *userq_mgr;
