diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c')
-rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c new file mode 100644 index 000000000000..51cddfa3f1e8 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_tlb_fence.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright 2023 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <linux/dma-fence.h> +#include <linux/workqueue.h> + +#include "amdgpu.h" +#include "amdgpu_vm.h" +#include "amdgpu_gmc.h" + +struct amdgpu_tlb_fence { + struct dma_fence base; + struct amdgpu_device *adev; + struct dma_fence *dependency; + struct work_struct work; + spinlock_t lock; + uint16_t pasid; + +}; + +static const char *amdgpu_tlb_fence_get_driver_name(struct dma_fence *fence) +{ + return "amdgpu tlb fence"; +} + +static const char *amdgpu_tlb_fence_get_timeline_name(struct dma_fence *f) +{ + return "amdgpu tlb timeline"; +} + +static void amdgpu_tlb_fence_work(struct work_struct *work) +{ + struct amdgpu_tlb_fence *f = container_of(work, typeof(*f), work); + int r; + + if (f->dependency) { + dma_fence_wait(f->dependency, false); + dma_fence_put(f->dependency); + f->dependency = NULL; + } + + r = amdgpu_gmc_flush_gpu_tlb_pasid(f->adev, f->pasid, 2, true, 0); + if (r) { + dev_err(f->adev->dev, "TLB flush failed for PASID %d.\n", + f->pasid); + dma_fence_set_error(&f->base, r); + } + + dma_fence_signal(&f->base); + dma_fence_put(&f->base); +} + +static const struct dma_fence_ops amdgpu_tlb_fence_ops = { + .use_64bit_seqno = true, + .get_driver_name = amdgpu_tlb_fence_get_driver_name, + .get_timeline_name = amdgpu_tlb_fence_get_timeline_name +}; + +void amdgpu_vm_tlb_fence_create(struct amdgpu_device *adev, struct amdgpu_vm *vm, + struct dma_fence **fence) +{ + struct amdgpu_tlb_fence *f; + + f = kmalloc(sizeof(*f), GFP_KERNEL); + if (!f) { + /* + * We can't fail since the PDEs and PTEs are already updated, so + * just block for the dependency and execute the TLB flush + */ + if (*fence) + dma_fence_wait(*fence, false); + + amdgpu_gmc_flush_gpu_tlb_pasid(adev, vm->pasid, 2, true, 0); + *fence = dma_fence_get_stub(); + return; + } + + f->adev = adev; + f->dependency = *fence; + f->pasid = vm->pasid; + INIT_WORK(&f->work, amdgpu_tlb_fence_work); + spin_lock_init(&f->lock); + + dma_fence_init(&f->base, &amdgpu_tlb_fence_ops, &f->lock, + vm->tlb_fence_context, atomic64_read(&vm->tlb_seq)); + + /* TODO: We probably need a separate wq here */ + dma_fence_get(&f->base); + schedule_work(&f->work); + + *fence = &f->base; +} |