Am 2021-06-01 um 5:30 p.m. schrieb Eric Huang:
> 1. conditionally flush TLBs after map.
> 2. add heavy weight TLBs flush after unmap.
>
> Signed-off-by: Eric Huang <[email protected]>
The code looks good to me. But it's mixing a bit too much in a single
commit, which makes it hard to see what's really changing. We should
break this into a few commits to separate refactoring from actual
functional changes:
1. Add flush-type parameter to kfd_flush_tlb
2. Add heavy-weight TLB flush after unmapping
3. Add table_freed parameter to amdgpu_vm_bo_update mapping
4. Make TLB-flush after mapping conditional on table_freed parameter
1 and 3 are just refactoring. 2 and 4 change functionality. When
reviewing those four commits, it should be easy to see that 1 and 3
don't change any functionality. And the functional changes in 2 and 4
should be really clear and obvious.
Regards,
Felix
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 2 +-
> .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 19 +++++++------
> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 6 ++---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 10 +++----
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 2 +-
> drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 27 +++++++++++--------
> .../drm/amd/amdkfd/kfd_device_queue_manager.c | 6 ++---
> drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 2 +-
> drivers/gpu/drm/amd/amdkfd/kfd_process.c | 7 ++---
> 10 files changed, 46 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> index 2560977760b3..8f2d6711e12f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> @@ -280,7 +280,7 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
> struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv,
> uint64_t *size);
> int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
> - struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv);
> + struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv, bool
> *flush_tlb);
> int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
> struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv);
> int amdgpu_amdkfd_gpuvm_sync_memory(
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index 1fcfa172911a..585b50b6009f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -1117,7 +1117,8 @@ static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
>
> static int update_gpuvm_pte(struct kgd_mem *mem,
> struct kfd_mem_attachment *entry,
> - struct amdgpu_sync *sync)
> + struct amdgpu_sync *sync,
> + bool *flush_tlb)
> {
> struct amdgpu_bo_va *bo_va = entry->bo_va;
> struct amdgpu_device *adev = entry->adev;
> @@ -1128,7 +1129,7 @@ static int update_gpuvm_pte(struct kgd_mem *mem,
> return ret;
>
> /* Update the page tables */
> - ret = amdgpu_vm_bo_update(adev, bo_va, false);
> + ret = amdgpu_vm_bo_update(adev, bo_va, false, flush_tlb);
> if (ret) {
> pr_err("amdgpu_vm_bo_update failed\n");
> return ret;
> @@ -1140,7 +1141,8 @@ static int update_gpuvm_pte(struct kgd_mem *mem,
> static int map_bo_to_gpuvm(struct kgd_mem *mem,
> struct kfd_mem_attachment *entry,
> struct amdgpu_sync *sync,
> - bool no_update_pte)
> + bool no_update_pte,
> + bool *flush_tlb)
> {
> int ret;
>
> @@ -1157,7 +1159,7 @@ static int map_bo_to_gpuvm(struct kgd_mem *mem,
> if (no_update_pte)
> return 0;
>
> - ret = update_gpuvm_pte(mem, entry, sync);
> + ret = update_gpuvm_pte(mem, entry, sync, flush_tlb);
> if (ret) {
> pr_err("update_gpuvm_pte() failed\n");
> goto update_gpuvm_pte_failed;
> @@ -1687,7 +1689,8 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
> }
>
> int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
> - struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv)
> + struct kgd_dev *kgd, struct kgd_mem *mem,
> + void *drm_priv, bool *flush_tlb)
> {
> struct amdgpu_device *adev = get_amdgpu_device(kgd);
> struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
> @@ -1775,7 +1778,7 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
> entry->va, entry->va + bo_size, entry);
>
> ret = map_bo_to_gpuvm(mem, entry, ctx.sync,
> - is_invalid_userptr);
> + is_invalid_userptr, flush_tlb);
> if (ret) {
> pr_err("Failed to map bo to gpuvm\n");
> goto out_unreserve;
> @@ -2469,7 +2472,7 @@ static int validate_invalid_user_pages(struct
> amdkfd_process_info *process_info)
> continue;
>
> kfd_mem_dmaunmap_attachment(mem, attachment);
> - ret = update_gpuvm_pte(mem, attachment, &sync);
> + ret = update_gpuvm_pte(mem, attachment, &sync, NULL);
> if (ret) {
> pr_err("%s: update PTE failed\n", __func__);
> /* make sure this gets validated again */
> @@ -2675,7 +2678,7 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info,
> struct dma_fence **ef)
> continue;
>
> kfd_mem_dmaunmap_attachment(mem, attachment);
> - ret = update_gpuvm_pte(mem, attachment, &sync_obj);
> + ret = update_gpuvm_pte(mem, attachment, &sync_obj,
> NULL);
> if (ret) {
> pr_debug("Memory eviction: update PTE failed.
> Try again\n");
> goto validate_map_fail;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index e9f9f462a652..e3df132e53a5 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -916,7 +916,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser
> *p)
> if (r)
> return r;
>
> - r = amdgpu_vm_bo_update(adev, fpriv->prt_va, false);
> + r = amdgpu_vm_bo_update(adev, fpriv->prt_va, false, NULL);
> if (r)
> return r;
>
> @@ -927,7 +927,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser
> *p)
> if (amdgpu_mcbp || amdgpu_sriov_vf(adev)) {
> bo_va = fpriv->csa_va;
> BUG_ON(!bo_va);
> - r = amdgpu_vm_bo_update(adev, bo_va, false);
> + r = amdgpu_vm_bo_update(adev, bo_va, false, NULL);
> if (r)
> return r;
>
> @@ -946,7 +946,7 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser
> *p)
> if (bo_va == NULL)
> continue;
>
> - r = amdgpu_vm_bo_update(adev, bo_va, false);
> + r = amdgpu_vm_bo_update(adev, bo_va, false, NULL);
> if (r)
> return r;
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index 2120a87a949f..eac2fd0048cc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -696,7 +696,7 @@ static void amdgpu_gem_va_update_vm(struct amdgpu_device
> *adev,
>
> if (operation == AMDGPU_VA_OP_MAP ||
> operation == AMDGPU_VA_OP_REPLACE) {
> - r = amdgpu_vm_bo_update(adev, bo_va, false);
> + r = amdgpu_vm_bo_update(adev, bo_va, false, NULL);
> if (r)
> goto error;
> }
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 2c20bba7dc1a..fed3d44b5ded 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1729,7 +1729,7 @@ int amdgpu_vm_bo_update_mapping(struct amdgpu_device
> *adev,
> r = vm->update_funcs->commit(¶ms, fence);
>
> if (table_freed)
> - *table_freed = params.table_freed;
> + *table_freed = *table_freed || params.table_freed;
>
> error_unlock:
> amdgpu_vm_eviction_unlock(vm);
> @@ -1793,7 +1793,7 @@ void amdgpu_vm_get_memory(struct amdgpu_vm *vm,
> uint64_t *vram_mem,
> * 0 for success, -EINVAL for failure.
> */
> int amdgpu_vm_bo_update(struct amdgpu_device *adev, struct amdgpu_bo_va
> *bo_va,
> - bool clear)
> + bool clear, bool *flush_tlb)
> {
> struct amdgpu_bo *bo = bo_va->base.bo;
> struct amdgpu_vm *vm = bo_va->base.vm;
> @@ -1887,7 +1887,7 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
> struct amdgpu_bo_va *bo_va,
> resv, mapping->start,
> mapping->last, update_flags,
> mapping->offset, mem,
> - pages_addr, last_update, NULL,
> + pages_addr, last_update,
> flush_tlb,
> vram_base_offset);
> if (r)
> return r;
> @@ -2141,7 +2141,7 @@ int amdgpu_vm_handle_moved(struct amdgpu_device *adev,
>
> list_for_each_entry_safe(bo_va, tmp, &vm->moved, base.vm_status) {
> /* Per VM BOs never need to bo cleared in the page tables */
> - r = amdgpu_vm_bo_update(adev, bo_va, false);
> + r = amdgpu_vm_bo_update(adev, bo_va, false, NULL);
> if (r)
> return r;
> }
> @@ -2160,7 +2160,7 @@ int amdgpu_vm_handle_moved(struct amdgpu_device *adev,
> else
> clear = true;
>
> - r = amdgpu_vm_bo_update(adev, bo_va, clear);
> + r = amdgpu_vm_bo_update(adev, bo_va, clear, NULL);
> if (r)
> return r;
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index 67bba8462e7d..24a63e284a69 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -419,7 +419,7 @@ int amdgpu_vm_bo_update_mapping(struct amdgpu_device
> *adev,
>
> int amdgpu_vm_bo_update(struct amdgpu_device *adev,
> struct amdgpu_bo_va *bo_va,
> - bool clear);
> + bool clear, bool *flush_tlb);
> bool amdgpu_vm_evictable(struct amdgpu_bo *bo);
> void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev,
> struct amdgpu_bo *bo, bool evicted);
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index 960913a35ee4..136f77cadc2f 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1574,6 +1574,7 @@ static int kfd_ioctl_map_memory_to_gpu(struct file
> *filep,
> long err = 0;
> int i;
> uint32_t *devices_arr = NULL;
> + bool flush_tlb = false;
>
> trace_kfd_map_memory_to_gpu_start(p);
> dev = kfd_device_by_id(GET_GPU_ID(args->handle));
> @@ -1637,7 +1638,8 @@ static int kfd_ioctl_map_memory_to_gpu(struct file
> *filep,
> goto map_memory_to_gpu_failed;
>
> err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
> - peer->kgd, (struct kgd_mem *)mem, peer_pdd->drm_priv);
> + peer->kgd, (struct kgd_mem *)mem,
> + peer_pdd->drm_priv, &flush_tlb);
> if (err) {
> pr_err("Failed to map to gpu %d/%d\n",
> i, args->n_devices);
> @@ -1658,16 +1660,18 @@ static int kfd_ioctl_map_memory_to_gpu(struct file
> *filep,
> }
>
> /* Flush TLBs after waiting for the page table updates to complete */
> - for (i = 0; i < args->n_devices; i++) {
> - peer = kfd_device_by_id(devices_arr[i]);
> - if (WARN_ON_ONCE(!peer))
> - continue;
> - peer_pdd = kfd_get_process_device_data(peer, p);
> - if (WARN_ON_ONCE(!peer_pdd))
> - continue;
> - if (!amdgpu_read_lock(peer->ddev, true)) {
> - kfd_flush_tlb(peer_pdd);
> - amdgpu_read_unlock(peer->ddev);
> + if (flush_tlb) {
> + for (i = 0; i < args->n_devices; i++) {
> + peer = kfd_device_by_id(devices_arr[i]);
> + if (WARN_ON_ONCE(!peer))
> + continue;
> + peer_pdd = kfd_get_process_device_data(peer, p);
> + if (WARN_ON_ONCE(!peer_pdd))
> + continue;
> + if (!amdgpu_read_lock(peer->ddev, true)) {
> + kfd_flush_tlb(peer_pdd, TLB_FLUSH_LEGACY);
> + amdgpu_read_unlock(peer->ddev);
> + }
> }
> }
>
> @@ -1766,6 +1770,7 @@ static int kfd_ioctl_unmap_memory_from_gpu(struct file
> *filep,
> amdgpu_read_unlock(peer->ddev);
> goto unmap_memory_from_gpu_failed;
> }
> + kfd_flush_tlb(peer_pdd, TLB_FLUSH_HEAVYWEIGHT);
> amdgpu_read_unlock(peer->ddev);
> args->n_success = i+1;
> }
> 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 2bd621eee4e0..904b8178c1d7 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -278,7 +278,7 @@ static int allocate_vmid(struct device_queue_manager *dqm,
> qpd->vmid,
> qpd->page_table_base);
> /* invalidate the VM context after pasid and vmid mapping is set up */
> - kfd_flush_tlb(qpd_to_pdd(qpd));
> + kfd_flush_tlb(qpd_to_pdd(qpd), TLB_FLUSH_LEGACY);
>
> if (dqm->dev->kfd2kgd->set_scratch_backing_va)
> dqm->dev->kfd2kgd->set_scratch_backing_va(dqm->dev->kgd,
> @@ -314,7 +314,7 @@ static void deallocate_vmid(struct device_queue_manager
> *dqm,
> if (flush_texture_cache_nocpsch(q->device, qpd))
> pr_err("Failed to flush TC\n");
>
> - kfd_flush_tlb(qpd_to_pdd(qpd));
> + kfd_flush_tlb(qpd_to_pdd(qpd), TLB_FLUSH_LEGACY);
>
> /* Release the vmid mapping */
> set_pasid_vmid_mapping(dqm, 0, qpd->vmid);
> @@ -885,7 +885,7 @@ static int restore_process_queues_nocpsch(struct
> device_queue_manager *dqm,
> dqm->dev->kgd,
> qpd->vmid,
> qpd->page_table_base);
> - kfd_flush_tlb(pdd);
> + kfd_flush_tlb(pdd, TLB_FLUSH_LEGACY);
> }
>
> /* Take a safe reference to the mm_struct, which may otherwise
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index ecdd5e782b81..edce3ecf207d 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -1338,7 +1338,7 @@ void kfd_signal_reset_event(struct kfd_dev *dev);
>
> void kfd_signal_poison_consumed_event(struct kfd_dev *dev, u32 pasid);
>
> -void kfd_flush_tlb(struct kfd_process_device *pdd);
> +void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type);
>
> int dbgdev_wave_reset_wavefronts(struct kfd_dev *dev, struct kfd_process *p);
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> index 3995002c582b..9708214116dc 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> @@ -689,7 +689,8 @@ static int kfd_process_alloc_gpuvm(struct
> kfd_process_device *pdd,
> if (err)
> goto err_alloc_mem;
>
> - err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem,
> pdd->drm_priv);
> + err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem,
> + pdd->drm_priv, NULL);
> if (err)
> goto err_map_mem;
>
> @@ -2159,7 +2160,7 @@ int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct
> kfd_process *process,
> KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
> }
>
> -void kfd_flush_tlb(struct kfd_process_device *pdd)
> +void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type)
> {
> struct kfd_dev *dev = pdd->dev;
>
> @@ -2172,7 +2173,7 @@ void kfd_flush_tlb(struct kfd_process_device *pdd)
> pdd->qpd.vmid);
> } else {
> amdgpu_amdkfd_flush_gpu_tlb_pasid(dev->kgd,
> - pdd->process->pasid, TLB_FLUSH_LEGACY);
> + pdd->process->pasid, type);
> }
> }
>
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