[PATCH v3 2/3] drm/amdkfd: Enable GFX11 usermode queue oversubscription
Christian König
christian.koenig at amd.com
Wed Jun 15 07:28:49 UTC 2022
Am 13.06.22 um 17:20 schrieb Graham Sider:
> Starting with GFX11, MES requires wptr BOs to be GTT allocated/mapped to
> GART for usermode queues in order to support oversubscription. In the
> case that work is submitted to an unmapped queue, MES must have a GART
> wptr address to determine whether the queue should be mapped.
>
> This change is accompanied with changes in MES and is applicable for
> MES_VERSION >= 3.
>
> v2:
> - Update MES_VERSION check from 2 to 3.
> v3:
> - Use amdgpu_vm_bo_lookup_mapping for wptr_bo mapping lookup
> - Move wptr_bo refcount increment to amdgpu_amdkfd_map_gtt_bo_to_gart
> - Remove list_del_init from amdgpu_amdkfd_map_gtt_bo_to_gart
> - Cleanup/fix create_queue wptr_bo error handling
>
> Signed-off-by: Graham Sider <Graham.Sider at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 1 +
> .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 49 +++++++++++++++++++
> drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 37 +++++++++++++-
> .../drm/amd/amdkfd/kfd_device_queue_manager.c | 9 +++-
> .../gpu/drm/amd/amdkfd/kfd_mqd_manager_v11.c | 2 +
> drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 3 ++
> .../amd/amdkfd/kfd_process_queue_manager.c | 17 +++++--
> 7 files changed, 110 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> index 429b16ba10bf..dba26d1e3be9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> @@ -301,6 +301,7 @@ int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct amdgpu_device *adev,
> struct kgd_mem *mem, void **kptr, uint64_t *size);
> void amdgpu_amdkfd_gpuvm_unmap_gtt_bo_from_kernel(struct amdgpu_device *adev,
> struct kgd_mem *mem);
> +int amdgpu_amdkfd_map_gtt_bo_to_gart(struct amdgpu_device *adev, struct amdgpu_bo *bo);
>
> int amdgpu_amdkfd_gpuvm_restore_process_bos(void *process_info,
> struct dma_fence **ef);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index efab923056f4..888d08128a94 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -2030,6 +2030,55 @@ int amdgpu_amdkfd_gpuvm_sync_memory(
> return ret;
> }
>
> +/**
> + * amdgpu_amdkfd_map_gtt_bo_to_gart - Map BO to GART and increment reference count
> + * @adev: Device to which allocated BO belongs
> + * @bo: Buffer object to be mapped
> + *
> + * Before return, bo reference count is incremented. To release the reference and unpin/
> + * unmap the BO, call amdgpu_amdkfd_free_gtt_mem.
> + */
> +int amdgpu_amdkfd_map_gtt_bo_to_gart(struct amdgpu_device *adev, struct amdgpu_bo *bo)
> +{
> + int ret;
> +
> + ret = amdgpu_bo_reserve(bo, true);
> + if (ret) {
> + pr_err("Failed to reserve bo. ret %d\n", ret);
> + goto err_reserve_bo_failed;
> + }
> +
> + ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
> + if (ret) {
> + pr_err("Failed to pin bo. ret %d\n", ret);
> + goto err_pin_bo_failed;
> + }
Oh! Is that something we do for every MQD? When yes that here is pretty
much a NAK.
We can't do this or create a trivial deny of service attack against the
kernel driver.
Regards,
Christian.
> +
> + ret = amdgpu_ttm_alloc_gart(&bo->tbo);
> + if (ret) {
> + pr_err("Failed to bind bo to GART. ret %d\n", ret);
> + goto err_map_bo_gart_failed;
> + }
> +
> + amdgpu_amdkfd_remove_eviction_fence(
> + bo, bo->kfd_bo->process_info->eviction_fence);
> + list_del_init(&bo->kfd_bo->validate_list.head);
> +
> + amdgpu_bo_unreserve(bo);
> +
> + bo = amdgpu_bo_ref(bo);
> +
> + return 0;
> +
> +err_map_bo_gart_failed:
> + amdgpu_bo_unpin(bo);
> +err_pin_bo_failed:
> + amdgpu_bo_unreserve(bo);
> +err_reserve_bo_failed:
> +
> + return ret;
> +}
> +
> int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct amdgpu_device *adev,
> struct kgd_mem *mem, void **kptr, uint64_t *size)
> {
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index e9766e165c38..1789ed8b79f5 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -289,6 +289,7 @@ static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
> struct kfd_process_device *pdd;
> struct queue_properties q_properties;
> uint32_t doorbell_offset_in_process = 0;
> + struct amdgpu_bo *wptr_bo = NULL;
>
> memset(&q_properties, 0, sizeof(struct queue_properties));
>
> @@ -316,12 +317,41 @@ static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
> goto err_bind_process;
> }
>
> + /* Starting with GFX11, wptr BOs must be mapped to GART for MES to determine work
> + * on unmapped queues for usermode queue oversubscription (no aggregated doorbell)
> + */
> + if (dev->shared_resources.enable_mes && (dev->adev->mes.sched_version & 0xff) >= 3) {
> + struct amdgpu_bo_va_mapping *wptr_mapping;
> + struct amdgpu_vm *wptr_vm;
> +
> + wptr_vm = drm_priv_to_vm(pdd->drm_priv);
> + err = amdgpu_bo_reserve(wptr_vm->root.bo, false);
> + if (err)
> + goto err_wptr_map_gart;
> +
> + wptr_mapping = amdgpu_vm_bo_lookup_mapping(
> + wptr_vm, args->write_pointer_address >> PAGE_SHIFT);
> + amdgpu_bo_unreserve(wptr_vm->root.bo);
> + if (!wptr_mapping) {
> + pr_err("Failed to lookup wptr bo\n");
> + err = -EINVAL;
> + goto err_wptr_map_gart;
> + }
> +
> + wptr_bo = wptr_mapping->bo_va->base.bo;
> + err = amdgpu_amdkfd_map_gtt_bo_to_gart(dev->adev, wptr_bo);
> + if (err) {
> + pr_err("Failed to map wptr bo to GART\n");
> + goto err_wptr_map_gart;
> + }
> + }
> +
> pr_debug("Creating queue for PASID 0x%x on gpu 0x%x\n",
> p->pasid,
> dev->id);
>
> - err = pqm_create_queue(&p->pqm, dev, filep, &q_properties, &queue_id, NULL, NULL, NULL,
> - &doorbell_offset_in_process);
> + err = pqm_create_queue(&p->pqm, dev, filep, &q_properties, &queue_id, wptr_bo,
> + NULL, NULL, NULL, &doorbell_offset_in_process);
> if (err != 0)
> goto err_create_queue;
>
> @@ -354,6 +384,9 @@ static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
> return 0;
>
> err_create_queue:
> + if (wptr_bo)
> + amdgpu_amdkfd_free_gtt_mem(dev->adev, wptr_bo);
> +err_wptr_map_gart:
> err_bind_process:
> err_pdd:
> mutex_unlock(&p->mutex);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> index b39d89c52887..d8de2fbdfc7d 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -208,6 +208,7 @@ static int add_queue_mes(struct device_queue_manager *dqm, struct queue *q,
> struct kfd_process_device *pdd = qpd_to_pdd(qpd);
> struct mes_add_queue_input queue_input;
> int r, queue_type;
> + uint64_t wptr_addr_off;
>
> if (dqm->is_hws_hang)
> return -EIO;
> @@ -227,7 +228,13 @@ static int add_queue_mes(struct device_queue_manager *dqm, struct queue *q,
> AMDGPU_MES_PRIORITY_LEVEL_NORMAL;
> queue_input.doorbell_offset = q->properties.doorbell_off;
> queue_input.mqd_addr = q->gart_mqd_addr;
> - queue_input.wptr_addr = (uint64_t)q->properties.write_ptr;
> +
> + if (q->wptr_bo) {
> + wptr_addr_off = (uint64_t)q->properties.write_ptr - (uint64_t)q->wptr_bo->kfd_bo->va;
> + queue_input.wptr_addr = ((uint64_t)q->wptr_bo->tbo.resource->start << PAGE_SHIFT) + wptr_addr_off;
> + } else
> + queue_input.wptr_addr = (uint64_t)q->properties.write_ptr;
> +
> queue_input.paging = false;
> queue_input.tba_addr = qpd->tba_addr;
> queue_input.tma_addr = qpd->tma_addr;
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v11.c b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v11.c
> index f1654b4da856..35e74bdd81da 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v11.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v11.c
> @@ -377,6 +377,8 @@ static void update_mqd_sdma(struct mqd_manager *mm, void *mqd,
> m->sdmax_rlcx_rb_base_hi = upper_32_bits(q->queue_address >> 8);
> m->sdmax_rlcx_rb_rptr_addr_lo = lower_32_bits((uint64_t)q->read_ptr);
> m->sdmax_rlcx_rb_rptr_addr_hi = upper_32_bits((uint64_t)q->read_ptr);
> + m->sdmax_rlcx_rb_wptr_poll_addr_lo = lower_32_bits((uint64_t)q->write_ptr);
> + m->sdmax_rlcx_rb_wptr_poll_addr_hi = upper_32_bits((uint64_t)q->write_ptr);
> m->sdmax_rlcx_doorbell_offset =
> q->doorbell_off << SDMA0_QUEUE0_DOORBELL_OFFSET__OFFSET__SHIFT;
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index a5d3963537d7..dcddee0d6f06 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -639,6 +639,8 @@ struct queue {
> void *gang_ctx_bo;
> uint64_t gang_ctx_gpu_addr;
> void *gang_ctx_cpu_ptr;
> +
> + struct amdgpu_bo *wptr_bo;
> };
>
> enum KFD_MQD_TYPE {
> @@ -1404,6 +1406,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
> struct file *f,
> struct queue_properties *properties,
> unsigned int *qid,
> + struct amdgpu_bo *wptr_bo,
> const struct kfd_criu_queue_priv_data *q_data,
> const void *restore_mqd,
> const void *restore_ctl_stack,
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
> index f99e09dc43ea..3a17c1ebc527 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
> @@ -190,7 +190,8 @@ void pqm_uninit(struct process_queue_manager *pqm)
> static int init_user_queue(struct process_queue_manager *pqm,
> struct kfd_dev *dev, struct queue **q,
> struct queue_properties *q_properties,
> - struct file *f, unsigned int qid)
> + struct file *f, struct amdgpu_bo *wptr_bo,
> + unsigned int qid)
> {
> int retval;
>
> @@ -221,6 +222,7 @@ static int init_user_queue(struct process_queue_manager *pqm,
> goto cleanup;
> }
> memset((*q)->gang_ctx_cpu_ptr, 0, AMDGPU_MES_GANG_CTX_SIZE);
> + (*q)->wptr_bo = wptr_bo;
> }
>
> pr_debug("PQM After init queue");
> @@ -237,6 +239,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
> struct file *f,
> struct queue_properties *properties,
> unsigned int *qid,
> + struct amdgpu_bo *wptr_bo,
> const struct kfd_criu_queue_priv_data *q_data,
> const void *restore_mqd,
> const void *restore_ctl_stack,
> @@ -299,7 +302,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
> * allocate_sdma_queue() in create_queue() has the
> * corresponding check logic.
> */
> - retval = init_user_queue(pqm, dev, &q, properties, f, *qid);
> + retval = init_user_queue(pqm, dev, &q, properties, f, wptr_bo, *qid);
> if (retval != 0)
> goto err_create_queue;
> pqn->q = q;
> @@ -320,7 +323,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
> goto err_create_queue;
> }
>
> - retval = init_user_queue(pqm, dev, &q, properties, f, *qid);
> + retval = init_user_queue(pqm, dev, &q, properties, f, wptr_bo, *qid);
> if (retval != 0)
> goto err_create_queue;
> pqn->q = q;
> @@ -457,9 +460,13 @@ int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid)
> pdd->qpd.num_gws = 0;
> }
>
> - if (dev->shared_resources.enable_mes)
> + if (dev->shared_resources.enable_mes) {
> amdgpu_amdkfd_free_gtt_mem(dev->adev,
> pqn->q->gang_ctx_bo);
> + if (pqn->q->wptr_bo)
> + amdgpu_amdkfd_free_gtt_mem(dev->adev, pqn->q->wptr_bo);
> +
> + }
> uninit_queue(pqn->q);
> }
>
> @@ -900,7 +907,7 @@ int kfd_criu_restore_queue(struct kfd_process *p,
>
> print_queue_properties(&qp);
>
> - ret = pqm_create_queue(&p->pqm, pdd->dev, NULL, &qp, &queue_id, q_data, mqd, ctl_stack,
> + ret = pqm_create_queue(&p->pqm, pdd->dev, NULL, &qp, &queue_id, NULL, q_data, mqd, ctl_stack,
> NULL);
> if (ret) {
> pr_err("Failed to create new queue err:%d\n", ret);
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