From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 452 ++++++++++++++++++++++++++++++ 1 file changed, 452 insertions(+) create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c new file mode 100644 index 000000000..8dcf6227a --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c @@ -0,0 +1,452 @@ +/* + * Copyright 2012 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. + * + * based on nouveau_prime.c + * + * Authors: Alex Deucher + */ + +/** + * DOC: PRIME Buffer Sharing + * + * The following callback implementations are used for :ref:`sharing GEM buffer + * objects between different devices via PRIME `. + */ + +#include + +#include "amdgpu.h" +#include "amdgpu_display.h" +#include +#include +#include + +static const struct dma_buf_ops amdgpu_dmabuf_ops; + +/** + * amdgpu_gem_prime_get_sg_table - &drm_driver.gem_prime_get_sg_table + * implementation + * @obj: GEM buffer object + * + * Returns: + * A scatter/gather table for the pinned pages of the buffer object's memory. + */ +struct sg_table *amdgpu_gem_prime_get_sg_table(struct drm_gem_object *obj) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + int npages = bo->tbo.num_pages; + + return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages); +} + +/** + * amdgpu_gem_prime_vmap - &dma_buf_ops.vmap implementation + * @obj: GEM buffer object + * + * Sets up an in-kernel virtual mapping of the buffer object's memory. + * + * Returns: + * The virtual address of the mapping or an error pointer. + */ +void *amdgpu_gem_prime_vmap(struct drm_gem_object *obj) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + int ret; + + ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, + &bo->dma_buf_vmap); + if (ret) + return ERR_PTR(ret); + + return bo->dma_buf_vmap.virtual; +} + +/** + * amdgpu_gem_prime_vunmap - &dma_buf_ops.vunmap implementation + * @obj: GEM buffer object + * @vaddr: virtual address (unused) + * + * Tears down the in-kernel virtual mapping of the buffer object's memory. + */ +void amdgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + + ttm_bo_kunmap(&bo->dma_buf_vmap); +} + +/** + * amdgpu_gem_prime_mmap - &drm_driver.gem_prime_mmap implementation + * @obj: GEM buffer object + * @vma: virtual memory area + * + * Sets up a userspace mapping of the buffer object's memory in the given + * virtual memory area. + * + * Returns: + * 0 on success or negative error code. + */ +int amdgpu_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); + unsigned asize = amdgpu_bo_size(bo); + int ret; + + if (!vma->vm_file) + return -ENODEV; + + if (adev == NULL) + return -ENODEV; + + /* Check for valid size. */ + if (asize < vma->vm_end - vma->vm_start) + return -EINVAL; + + if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) || + (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) { + return -EPERM; + } + vma->vm_pgoff += amdgpu_bo_mmap_offset(bo) >> PAGE_SHIFT; + + /* prime mmap does not need to check access, so allow here */ + ret = drm_vma_node_allow(&obj->vma_node, vma->vm_file->private_data); + if (ret) + return ret; + + ret = ttm_bo_mmap(vma->vm_file, vma, &adev->mman.bdev); + drm_vma_node_revoke(&obj->vma_node, vma->vm_file->private_data); + + return ret; +} + +/** + * amdgpu_gem_prime_import_sg_table - &drm_driver.gem_prime_import_sg_table + * implementation + * @dev: DRM device + * @attach: DMA-buf attachment + * @sg: Scatter/gather table + * + * Import shared DMA buffer memory exported by another device. + * + * Returns: + * A new GEM buffer object of the given DRM device, representing the memory + * described by the given DMA-buf attachment and scatter/gather table. + */ +struct drm_gem_object * +amdgpu_gem_prime_import_sg_table(struct drm_device *dev, + struct dma_buf_attachment *attach, + struct sg_table *sg) +{ + struct reservation_object *resv = attach->dmabuf->resv; + struct amdgpu_device *adev = dev->dev_private; + struct amdgpu_bo *bo; + struct amdgpu_bo_param bp; + int ret; + + memset(&bp, 0, sizeof(bp)); + bp.size = attach->dmabuf->size; + bp.byte_align = PAGE_SIZE; + bp.domain = AMDGPU_GEM_DOMAIN_CPU; + bp.flags = 0; + bp.type = ttm_bo_type_sg; + bp.resv = resv; + ww_mutex_lock(&resv->lock, NULL); + ret = amdgpu_bo_create(adev, &bp, &bo); + if (ret) + goto error; + + bo->tbo.sg = sg; + bo->tbo.ttm->sg = sg; + bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT; + bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT; + if (attach->dmabuf->ops != &amdgpu_dmabuf_ops) + bo->prime_shared_count = 1; + + ww_mutex_unlock(&resv->lock); + return &bo->gem_base; + +error: + ww_mutex_unlock(&resv->lock); + return ERR_PTR(ret); +} + +static int +__reservation_object_make_exclusive(struct reservation_object *obj) +{ + struct dma_fence **fences; + unsigned int count; + int r; + + if (!reservation_object_get_list(obj)) /* no shared fences to convert */ + return 0; + + r = reservation_object_get_fences_rcu(obj, NULL, &count, &fences); + if (r) + return r; + + if (count == 0) { + /* Now that was unexpected. */ + } else if (count == 1) { + reservation_object_add_excl_fence(obj, fences[0]); + dma_fence_put(fences[0]); + kfree(fences); + } else { + struct dma_fence_array *array; + + array = dma_fence_array_create(count, fences, + dma_fence_context_alloc(1), 0, + false); + if (!array) + goto err_fences_put; + + reservation_object_add_excl_fence(obj, &array->base); + dma_fence_put(&array->base); + } + + return 0; + +err_fences_put: + while (count--) + dma_fence_put(fences[count]); + kfree(fences); + return -ENOMEM; +} + +/** + * amdgpu_gem_map_attach - &dma_buf_ops.attach implementation + * @dma_buf: shared DMA buffer + * @attach: DMA-buf attachment + * + * Makes sure that the shared DMA buffer can be accessed by the target device. + * For now, simply pins it to the GTT domain, where it should be accessible by + * all DMA devices. + * + * Returns: + * 0 on success or negative error code. + */ +static int amdgpu_gem_map_attach(struct dma_buf *dma_buf, + struct dma_buf_attachment *attach) +{ + struct drm_gem_object *obj = dma_buf->priv; + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); + long r; + + r = drm_gem_map_attach(dma_buf, attach); + if (r) + return r; + + r = amdgpu_bo_reserve(bo, false); + if (unlikely(r != 0)) + goto error_detach; + + + if (attach->dev->driver != adev->dev->driver) { + /* + * We only create shared fences for internal use, but importers + * of the dmabuf rely on exclusive fences for implicitly + * tracking write hazards. As any of the current fences may + * correspond to a write, we need to convert all existing + * fences on the reservation object into a single exclusive + * fence. + */ + r = __reservation_object_make_exclusive(bo->tbo.resv); + if (r) + goto error_unreserve; + } + + /* pin buffer into GTT */ + r = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT); + if (r) + goto error_unreserve; + + if (attach->dev->driver != adev->dev->driver) + bo->prime_shared_count++; + +error_unreserve: + amdgpu_bo_unreserve(bo); + +error_detach: + if (r) + drm_gem_map_detach(dma_buf, attach); + return r; +} + +/** + * amdgpu_gem_map_detach - &dma_buf_ops.detach implementation + * @dma_buf: shared DMA buffer + * @attach: DMA-buf attachment + * + * This is called when a shared DMA buffer no longer needs to be accessible by + * the other device. For now, simply unpins the buffer from GTT. + */ +static void amdgpu_gem_map_detach(struct dma_buf *dma_buf, + struct dma_buf_attachment *attach) +{ + struct drm_gem_object *obj = dma_buf->priv; + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); + int ret = 0; + + ret = amdgpu_bo_reserve(bo, true); + if (unlikely(ret != 0)) + goto error; + + amdgpu_bo_unpin(bo); + if (attach->dev->driver != adev->dev->driver && bo->prime_shared_count) + bo->prime_shared_count--; + amdgpu_bo_unreserve(bo); + +error: + drm_gem_map_detach(dma_buf, attach); +} + +/** + * amdgpu_gem_prime_res_obj - &drm_driver.gem_prime_res_obj implementation + * @obj: GEM buffer object + * + * Returns: + * The buffer object's reservation object. + */ +struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + + return bo->tbo.resv; +} + +/** + * amdgpu_gem_begin_cpu_access - &dma_buf_ops.begin_cpu_access implementation + * @dma_buf: shared DMA buffer + * @direction: direction of DMA transfer + * + * This is called before CPU access to the shared DMA buffer's memory. If it's + * a read access, the buffer is moved to the GTT domain if possible, for optimal + * CPU read performance. + * + * Returns: + * 0 on success or negative error code. + */ +static int amdgpu_gem_begin_cpu_access(struct dma_buf *dma_buf, + enum dma_data_direction direction) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(dma_buf->priv); + struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); + struct ttm_operation_ctx ctx = { true, false }; + u32 domain = amdgpu_display_supported_domains(adev); + int ret; + bool reads = (direction == DMA_BIDIRECTIONAL || + direction == DMA_FROM_DEVICE); + + if (!reads || !(domain & AMDGPU_GEM_DOMAIN_GTT)) + return 0; + + /* move to gtt */ + ret = amdgpu_bo_reserve(bo, false); + if (unlikely(ret != 0)) + return ret; + + if (!bo->pin_count && (bo->allowed_domains & AMDGPU_GEM_DOMAIN_GTT)) { + amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT); + ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); + } + + amdgpu_bo_unreserve(bo); + return ret; +} + +static const struct dma_buf_ops amdgpu_dmabuf_ops = { + .attach = amdgpu_gem_map_attach, + .detach = amdgpu_gem_map_detach, + .map_dma_buf = drm_gem_map_dma_buf, + .unmap_dma_buf = drm_gem_unmap_dma_buf, + .release = drm_gem_dmabuf_release, + .begin_cpu_access = amdgpu_gem_begin_cpu_access, + .map = drm_gem_dmabuf_kmap, + .unmap = drm_gem_dmabuf_kunmap, + .mmap = drm_gem_dmabuf_mmap, + .vmap = drm_gem_dmabuf_vmap, + .vunmap = drm_gem_dmabuf_vunmap, +}; + +/** + * amdgpu_gem_prime_export - &drm_driver.gem_prime_export implementation + * @dev: DRM device + * @gobj: GEM buffer object + * @flags: flags like DRM_CLOEXEC and DRM_RDWR + * + * The main work is done by the &drm_gem_prime_export helper, which in turn + * uses &amdgpu_gem_prime_res_obj. + * + * Returns: + * Shared DMA buffer representing the GEM buffer object from the given device. + */ +struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev, + struct drm_gem_object *gobj, + int flags) +{ + struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj); + struct dma_buf *buf; + + if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) || + bo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID) + return ERR_PTR(-EPERM); + + buf = drm_gem_prime_export(dev, gobj, flags); + if (!IS_ERR(buf)) { + buf->file->f_mapping = dev->anon_inode->i_mapping; + buf->ops = &amdgpu_dmabuf_ops; + } + + return buf; +} + +/** + * amdgpu_gem_prime_import - &drm_driver.gem_prime_import implementation + * @dev: DRM device + * @dma_buf: Shared DMA buffer + * + * The main work is done by the &drm_gem_prime_import helper, which in turn + * uses &amdgpu_gem_prime_import_sg_table. + * + * Returns: + * GEM buffer object representing the shared DMA buffer for the given device. + */ +struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev, + struct dma_buf *dma_buf) +{ + struct drm_gem_object *obj; + + if (dma_buf->ops == &amdgpu_dmabuf_ops) { + obj = dma_buf->priv; + if (obj->dev == dev) { + /* + * Importing dmabuf exported from out own gem increases + * refcount on gem itself instead of f_count of dmabuf. + */ + drm_gem_object_get(obj); + return obj; + } + } + + return drm_gem_prime_import(dev, dma_buf); +} -- cgit v1.2.3