drm/ttm: Add a generic TTM memcpy move for page-based iomem
The internal ttm_bo_util memcpy uses ioremap functionality, and while it probably might be possible to use it for copying in- and out of sglist represented io memory, using io_mem_reserve() / io_mem_free() callbacks, that would cause problems with fault(). Instead, implement a method mapping page-by-page using kmap_local() semantics. As an additional benefit we then avoid the occasional global TLB flushes of ioremap() and consuming ioremap space, elimination of a critical point of failure and with a slight change of semantics we could also push the memcpy out async for testing and async driver development purposes. A special linear iomem iterator is introduced internally to mimic the old ioremap behaviour for code-paths that can't immediately be ported over. This adds to the code size and should be considered a temporary solution. Looking at the code we have a lot of checks for iomap tagged pointers. Ideally we should extend the core memremap functions to also accept uncached memory and kmap_local functionality. Then we could strip a lot of code. Cc: Christian König <christian.koenig@amd.com> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://lore.kernel.org/r/20210602083818.241793-4-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström
Родитель
c43f2f9842
Коммит
3bf3710e37
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@ -72,188 +72,125 @@ void ttm_mem_io_free(struct ttm_device *bdev,
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mem->bus.addr = NULL;
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}
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static int ttm_resource_ioremap(struct ttm_device *bdev,
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struct ttm_resource *mem,
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void **virtual)
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/**
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* ttm_move_memcpy - Helper to perform a memcpy ttm move operation.
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* @bo: The struct ttm_buffer_object.
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* @new_mem: The struct ttm_resource we're moving to (copy destination).
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* @new_iter: A struct ttm_kmap_iter representing the destination resource.
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* @src_iter: A struct ttm_kmap_iter representing the source resource.
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*
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* This function is intended to be able to move out async under a
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* dma-fence if desired.
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*/
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void ttm_move_memcpy(struct ttm_buffer_object *bo,
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u32 num_pages,
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struct ttm_kmap_iter *dst_iter,
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struct ttm_kmap_iter *src_iter)
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{
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int ret;
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void *addr;
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const struct ttm_kmap_iter_ops *dst_ops = dst_iter->ops;
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const struct ttm_kmap_iter_ops *src_ops = src_iter->ops;
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struct ttm_tt *ttm = bo->ttm;
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struct dma_buf_map src_map, dst_map;
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pgoff_t i;
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*virtual = NULL;
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ret = ttm_mem_io_reserve(bdev, mem);
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if (ret || !mem->bus.is_iomem)
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return ret;
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/* Single TTM move. NOP */
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if (dst_ops->maps_tt && src_ops->maps_tt)
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return;
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if (mem->bus.addr) {
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addr = mem->bus.addr;
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} else {
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size_t bus_size = (size_t)mem->num_pages << PAGE_SHIFT;
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/* Don't move nonexistent data. Clear destination instead. */
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if (src_ops->maps_tt && (!ttm || !ttm_tt_is_populated(ttm))) {
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if (ttm && !(ttm->page_flags & TTM_PAGE_FLAG_ZERO_ALLOC))
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return;
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if (mem->bus.caching == ttm_write_combined)
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addr = ioremap_wc(mem->bus.offset, bus_size);
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#ifdef CONFIG_X86
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else if (mem->bus.caching == ttm_cached)
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addr = ioremap_cache(mem->bus.offset, bus_size);
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#endif
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for (i = 0; i < num_pages; ++i) {
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dst_ops->map_local(dst_iter, &dst_map, i);
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if (dst_map.is_iomem)
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memset_io(dst_map.vaddr_iomem, 0, PAGE_SIZE);
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else
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addr = ioremap(mem->bus.offset, bus_size);
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if (!addr) {
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ttm_mem_io_free(bdev, mem);
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return -ENOMEM;
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memset(dst_map.vaddr, 0, PAGE_SIZE);
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if (dst_ops->unmap_local)
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dst_ops->unmap_local(dst_iter, &dst_map);
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}
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return;
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}
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for (i = 0; i < num_pages; ++i) {
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dst_ops->map_local(dst_iter, &dst_map, i);
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src_ops->map_local(src_iter, &src_map, i);
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if (!src_map.is_iomem && !dst_map.is_iomem) {
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memcpy(dst_map.vaddr, src_map.vaddr, PAGE_SIZE);
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} else if (!src_map.is_iomem) {
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dma_buf_map_memcpy_to(&dst_map, src_map.vaddr,
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PAGE_SIZE);
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} else if (!dst_map.is_iomem) {
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memcpy_fromio(dst_map.vaddr, src_map.vaddr_iomem,
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PAGE_SIZE);
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} else {
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int j;
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u32 __iomem *src = src_map.vaddr_iomem;
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u32 __iomem *dst = dst_map.vaddr_iomem;
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for (j = 0; j < (PAGE_SIZE / sizeof(u32)); ++j)
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iowrite32(ioread32(src++), dst++);
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}
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if (src_ops->unmap_local)
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src_ops->unmap_local(src_iter, &src_map);
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if (dst_ops->unmap_local)
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dst_ops->unmap_local(dst_iter, &dst_map);
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}
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*virtual = addr;
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return 0;
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}
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static void ttm_resource_iounmap(struct ttm_device *bdev,
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struct ttm_resource *mem,
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void *virtual)
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{
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if (virtual && mem->bus.addr == NULL)
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iounmap(virtual);
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ttm_mem_io_free(bdev, mem);
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}
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static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
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{
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uint32_t *dstP =
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(uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
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uint32_t *srcP =
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(uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
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int i;
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for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
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iowrite32(ioread32(srcP++), dstP++);
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return 0;
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}
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static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
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unsigned long page,
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pgprot_t prot)
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{
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struct page *d = ttm->pages[page];
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void *dst;
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if (!d)
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return -ENOMEM;
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src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
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dst = kmap_atomic_prot(d, prot);
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if (!dst)
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return -ENOMEM;
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memcpy_fromio(dst, src, PAGE_SIZE);
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kunmap_atomic(dst);
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return 0;
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}
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static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
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unsigned long page,
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pgprot_t prot)
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{
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struct page *s = ttm->pages[page];
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void *src;
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if (!s)
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return -ENOMEM;
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dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
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src = kmap_atomic_prot(s, prot);
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if (!src)
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return -ENOMEM;
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memcpy_toio(dst, src, PAGE_SIZE);
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kunmap_atomic(src);
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return 0;
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}
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EXPORT_SYMBOL(ttm_move_memcpy);
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int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
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struct ttm_operation_ctx *ctx,
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struct ttm_resource *new_mem)
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struct ttm_resource *dst_mem)
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{
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struct ttm_resource *old_mem = bo->resource;
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struct ttm_device *bdev = bo->bdev;
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struct ttm_resource_manager *man;
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struct ttm_resource_manager *dst_man =
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ttm_manager_type(bo->bdev, dst_mem->mem_type);
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struct ttm_tt *ttm = bo->ttm;
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void *old_iomap;
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void *new_iomap;
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int ret;
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unsigned long i;
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struct ttm_resource *src_mem = bo->resource;
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struct ttm_resource_manager *src_man =
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ttm_manager_type(bdev, src_mem->mem_type);
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struct ttm_resource src_copy = *src_mem;
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union {
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struct ttm_kmap_iter_tt tt;
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struct ttm_kmap_iter_linear_io io;
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} _dst_iter, _src_iter;
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struct ttm_kmap_iter *dst_iter, *src_iter;
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int ret = 0;
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man = ttm_manager_type(bdev, new_mem->mem_type);
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ret = ttm_bo_wait_ctx(bo, ctx);
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if (ret)
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return ret;
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ret = ttm_resource_ioremap(bdev, old_mem, &old_iomap);
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if (ret)
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return ret;
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ret = ttm_resource_ioremap(bdev, new_mem, &new_iomap);
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if (ret)
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goto out;
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/*
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* Single TTM move. NOP.
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*/
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if (old_iomap == NULL && new_iomap == NULL)
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goto out1;
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/*
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* Don't move nonexistent data. Clear destination instead.
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*/
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if (old_iomap == NULL &&
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(ttm == NULL || (!ttm_tt_is_populated(ttm) &&
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!(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
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memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
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goto out1;
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}
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/*
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* TTM might be null for moves within the same region.
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*/
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if (ttm) {
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if (ttm && ((ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) ||
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dst_man->use_tt)) {
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ret = ttm_tt_populate(bdev, ttm, ctx);
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if (ret)
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goto out1;
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}
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for (i = 0; i < new_mem->num_pages; ++i) {
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if (old_iomap == NULL) {
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pgprot_t prot = ttm_io_prot(bo, old_mem, PAGE_KERNEL);
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ret = ttm_copy_ttm_io_page(ttm, new_iomap, i,
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prot);
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} else if (new_iomap == NULL) {
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pgprot_t prot = ttm_io_prot(bo, new_mem, PAGE_KERNEL);
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ret = ttm_copy_io_ttm_page(ttm, old_iomap, i,
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prot);
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} else {
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ret = ttm_copy_io_page(new_iomap, old_iomap, i);
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}
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if (ret)
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break;
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}
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mb();
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out1:
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ttm_resource_iounmap(bdev, new_mem, new_iomap);
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out:
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ttm_resource_iounmap(bdev, old_mem, old_iomap);
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if (ret) {
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ttm_resource_free(bo, &new_mem);
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return ret;
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}
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ttm_resource_free(bo, &bo->resource);
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ttm_bo_assign_mem(bo, new_mem);
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dst_iter = ttm_kmap_iter_linear_io_init(&_dst_iter.io, bdev, dst_mem);
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if (PTR_ERR(dst_iter) == -EINVAL && dst_man->use_tt)
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dst_iter = ttm_kmap_iter_tt_init(&_dst_iter.tt, bo->ttm);
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if (IS_ERR(dst_iter))
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return PTR_ERR(dst_iter);
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if (!man->use_tt)
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ttm_bo_tt_destroy(bo);
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src_iter = ttm_kmap_iter_linear_io_init(&_src_iter.io, bdev, src_mem);
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if (PTR_ERR(src_iter) == -EINVAL && src_man->use_tt)
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src_iter = ttm_kmap_iter_tt_init(&_src_iter.tt, bo->ttm);
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if (IS_ERR(src_iter)) {
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ret = PTR_ERR(src_iter);
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goto out_src_iter;
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}
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ttm_move_memcpy(bo, dst_mem->num_pages, dst_iter, src_iter);
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src_copy = *src_mem;
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ttm_bo_move_sync_cleanup(bo, dst_mem);
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if (!src_iter->ops->maps_tt)
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ttm_kmap_iter_linear_io_fini(&_src_iter.io, bdev, &src_copy);
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out_src_iter:
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if (!dst_iter->ops->maps_tt)
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ttm_kmap_iter_linear_io_fini(&_dst_iter.io, bdev, dst_mem);
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return ret;
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}
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@ -335,27 +272,7 @@ pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
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man = ttm_manager_type(bo->bdev, res->mem_type);
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caching = man->use_tt ? bo->ttm->caching : res->bus.caching;
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/* Cached mappings need no adjustment */
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if (caching == ttm_cached)
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return tmp;
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#if defined(__i386__) || defined(__x86_64__)
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if (caching == ttm_write_combined)
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tmp = pgprot_writecombine(tmp);
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else if (boot_cpu_data.x86 > 3)
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tmp = pgprot_noncached(tmp);
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#endif
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#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
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defined(__powerpc__) || defined(__mips__)
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if (caching == ttm_write_combined)
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tmp = pgprot_writecombine(tmp);
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else
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tmp = pgprot_noncached(tmp);
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#endif
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#if defined(__sparc__)
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tmp = pgprot_noncached(tmp);
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#endif
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return tmp;
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return ttm_prot_from_caching(caching, tmp);
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}
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EXPORT_SYMBOL(ttm_io_prot);
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@ -31,12 +31,47 @@
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/pgtable.h>
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#include <linux/sched.h>
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#include <linux/debugfs.h>
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#include <drm/drm_sysfs.h>
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#include <drm/ttm/ttm_caching.h>
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#include "ttm_module.h"
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/**
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* ttm_prot_from_caching - Modify the page protection according to the
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* ttm cacing mode
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* @caching: The ttm caching mode
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* @tmp: The original page protection
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*
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* Return: The modified page protection
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*/
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pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp)
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{
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/* Cached mappings need no adjustment */
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if (caching == ttm_cached)
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return tmp;
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#if defined(__i386__) || defined(__x86_64__)
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if (caching == ttm_write_combined)
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tmp = pgprot_writecombine(tmp);
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else if (boot_cpu_data.x86 > 3)
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tmp = pgprot_noncached(tmp);
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#endif
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#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
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defined(__powerpc__) || defined(__mips__)
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if (caching == ttm_write_combined)
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tmp = pgprot_writecombine(tmp);
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else
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tmp = pgprot_noncached(tmp);
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#endif
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#if defined(__sparc__)
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tmp = pgprot_noncached(tmp);
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#endif
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return tmp;
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}
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struct dentry *ttm_debugfs_root;
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static int __init ttm_init(void)
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@ -22,6 +22,10 @@
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* Authors: Christian König
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*/
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#include <linux/dma-buf-map.h>
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#include <linux/io-mapping.h>
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#include <linux/scatterlist.h>
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#include <drm/ttm/ttm_resource.h>
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#include <drm/ttm/ttm_bo_driver.h>
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@ -154,3 +158,192 @@ void ttm_resource_manager_debug(struct ttm_resource_manager *man,
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man->func->debug(man, p);
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}
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EXPORT_SYMBOL(ttm_resource_manager_debug);
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static void ttm_kmap_iter_iomap_map_local(struct ttm_kmap_iter *iter,
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struct dma_buf_map *dmap,
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pgoff_t i)
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{
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struct ttm_kmap_iter_iomap *iter_io =
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container_of(iter, typeof(*iter_io), base);
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void __iomem *addr;
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retry:
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while (i >= iter_io->cache.end) {
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iter_io->cache.sg = iter_io->cache.sg ?
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sg_next(iter_io->cache.sg) : iter_io->st->sgl;
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iter_io->cache.i = iter_io->cache.end;
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iter_io->cache.end += sg_dma_len(iter_io->cache.sg) >>
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PAGE_SHIFT;
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iter_io->cache.offs = sg_dma_address(iter_io->cache.sg) -
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iter_io->start;
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}
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|
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if (i < iter_io->cache.i) {
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iter_io->cache.end = 0;
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iter_io->cache.sg = NULL;
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goto retry;
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}
|
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|
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addr = io_mapping_map_local_wc(iter_io->iomap, iter_io->cache.offs +
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(((resource_size_t)i - iter_io->cache.i)
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<< PAGE_SHIFT));
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dma_buf_map_set_vaddr_iomem(dmap, addr);
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}
|
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|
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static void ttm_kmap_iter_iomap_unmap_local(struct ttm_kmap_iter *iter,
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struct dma_buf_map *map)
|
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{
|
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io_mapping_unmap_local(map->vaddr_iomem);
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}
|
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|
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static const struct ttm_kmap_iter_ops ttm_kmap_iter_io_ops = {
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.map_local = ttm_kmap_iter_iomap_map_local,
|
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.unmap_local = ttm_kmap_iter_iomap_unmap_local,
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.maps_tt = false,
|
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};
|
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|
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/**
|
||||
* ttm_kmap_iter_iomap_init - Initialize a struct ttm_kmap_iter_iomap
|
||||
* @iter_io: The struct ttm_kmap_iter_iomap to initialize.
|
||||
* @iomap: The struct io_mapping representing the underlying linear io_memory.
|
||||
* @st: sg_table into @iomap, representing the memory of the struct
|
||||
* ttm_resource.
|
||||
* @start: Offset that needs to be subtracted from @st to make
|
||||
* sg_dma_address(st->sgl) - @start == 0 for @iomap start.
|
||||
*
|
||||
* Return: Pointer to the embedded struct ttm_kmap_iter.
|
||||
*/
|
||||
struct ttm_kmap_iter *
|
||||
ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
|
||||
struct io_mapping *iomap,
|
||||
struct sg_table *st,
|
||||
resource_size_t start)
|
||||
{
|
||||
iter_io->base.ops = &ttm_kmap_iter_io_ops;
|
||||
iter_io->iomap = iomap;
|
||||
iter_io->st = st;
|
||||
iter_io->start = start;
|
||||
memset(&iter_io->cache, 0, sizeof(iter_io->cache));
|
||||
|
||||
return &iter_io->base;
|
||||
}
|
||||
EXPORT_SYMBOL(ttm_kmap_iter_iomap_init);
|
||||
|
||||
/**
|
||||
* DOC: Linear io iterator
|
||||
*
|
||||
* This code should die in the not too near future. Best would be if we could
|
||||
* make io-mapping use memremap for all io memory, and have memremap
|
||||
* implement a kmap_local functionality. We could then strip a huge amount of
|
||||
* code. These linear io iterators are implemented to mimic old functionality,
|
||||
* and they don't use kmap_local semantics at all internally. Rather ioremap or
|
||||
* friends, and at least on 32-bit they add global TLB flushes and points
|
||||
* of failure.
|
||||
*/
|
||||
|
||||
static void ttm_kmap_iter_linear_io_map_local(struct ttm_kmap_iter *iter,
|
||||
struct dma_buf_map *dmap,
|
||||
pgoff_t i)
|
||||
{
|
||||
struct ttm_kmap_iter_linear_io *iter_io =
|
||||
container_of(iter, typeof(*iter_io), base);
|
||||
|
||||
*dmap = iter_io->dmap;
|
||||
dma_buf_map_incr(dmap, i * PAGE_SIZE);
|
||||
}
|
||||
|
||||
static const struct ttm_kmap_iter_ops ttm_kmap_iter_linear_io_ops = {
|
||||
.map_local = ttm_kmap_iter_linear_io_map_local,
|
||||
.maps_tt = false,
|
||||
};
|
||||
|
||||
/**
|
||||
* ttm_kmap_iter_linear_io_init - Initialize an iterator for linear io memory
|
||||
* @iter_io: The iterator to initialize
|
||||
* @bdev: The TTM device
|
||||
* @mem: The ttm resource representing the iomap.
|
||||
*
|
||||
* This function is for internal TTM use only. It sets up a memcpy kmap iterator
|
||||
* pointing at a linear chunk of io memory.
|
||||
*
|
||||
* Return: A pointer to the embedded struct ttm_kmap_iter or error pointer on
|
||||
* failure.
|
||||
*/
|
||||
struct ttm_kmap_iter *
|
||||
ttm_kmap_iter_linear_io_init(struct ttm_kmap_iter_linear_io *iter_io,
|
||||
struct ttm_device *bdev,
|
||||
struct ttm_resource *mem)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = ttm_mem_io_reserve(bdev, mem);
|
||||
if (ret)
|
||||
goto out_err;
|
||||
if (!mem->bus.is_iomem) {
|
||||
ret = -EINVAL;
|
||||
goto out_io_free;
|
||||
}
|
||||
|
||||
if (mem->bus.addr) {
|
||||
dma_buf_map_set_vaddr(&iter_io->dmap, mem->bus.addr);
|
||||
iter_io->needs_unmap = false;
|
||||
} else {
|
||||
size_t bus_size = (size_t)mem->num_pages << PAGE_SHIFT;
|
||||
|
||||
iter_io->needs_unmap = true;
|
||||
memset(&iter_io->dmap, 0, sizeof(iter_io->dmap));
|
||||
if (mem->bus.caching == ttm_write_combined)
|
||||
dma_buf_map_set_vaddr_iomem(&iter_io->dmap,
|
||||
ioremap_wc(mem->bus.offset,
|
||||
bus_size));
|
||||
else if (mem->bus.caching == ttm_cached)
|
||||
dma_buf_map_set_vaddr(&iter_io->dmap,
|
||||
memremap(mem->bus.offset, bus_size,
|
||||
MEMREMAP_WB |
|
||||
MEMREMAP_WT |
|
||||
MEMREMAP_WC));
|
||||
|
||||
/* If uncached requested or if mapping cached or wc failed */
|
||||
if (dma_buf_map_is_null(&iter_io->dmap))
|
||||
dma_buf_map_set_vaddr_iomem(&iter_io->dmap,
|
||||
ioremap(mem->bus.offset,
|
||||
bus_size));
|
||||
|
||||
if (dma_buf_map_is_null(&iter_io->dmap)) {
|
||||
ret = -ENOMEM;
|
||||
goto out_io_free;
|
||||
}
|
||||
}
|
||||
|
||||
iter_io->base.ops = &ttm_kmap_iter_linear_io_ops;
|
||||
return &iter_io->base;
|
||||
|
||||
out_io_free:
|
||||
ttm_mem_io_free(bdev, mem);
|
||||
out_err:
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* ttm_kmap_iter_linear_io_fini - Clean up an iterator for linear io memory
|
||||
* @iter_io: The iterator to initialize
|
||||
* @bdev: The TTM device
|
||||
* @mem: The ttm resource representing the iomap.
|
||||
*
|
||||
* This function is for internal TTM use only. It cleans up a memcpy kmap
|
||||
* iterator initialized by ttm_kmap_iter_linear_io_init.
|
||||
*/
|
||||
void
|
||||
ttm_kmap_iter_linear_io_fini(struct ttm_kmap_iter_linear_io *iter_io,
|
||||
struct ttm_device *bdev,
|
||||
struct ttm_resource *mem)
|
||||
{
|
||||
if (iter_io->needs_unmap && dma_buf_map_is_set(&iter_io->dmap)) {
|
||||
if (iter_io->dmap.is_iomem)
|
||||
iounmap(iter_io->dmap.vaddr_iomem);
|
||||
else
|
||||
memunmap(iter_io->dmap.vaddr);
|
||||
}
|
||||
|
||||
ttm_mem_io_free(bdev, mem);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -433,3 +433,48 @@ void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages)
|
|||
if (!ttm_dma32_pages_limit)
|
||||
ttm_dma32_pages_limit = num_dma32_pages;
|
||||
}
|
||||
|
||||
static void ttm_kmap_iter_tt_map_local(struct ttm_kmap_iter *iter,
|
||||
struct dma_buf_map *dmap,
|
||||
pgoff_t i)
|
||||
{
|
||||
struct ttm_kmap_iter_tt *iter_tt =
|
||||
container_of(iter, typeof(*iter_tt), base);
|
||||
|
||||
dma_buf_map_set_vaddr(dmap, kmap_local_page_prot(iter_tt->tt->pages[i],
|
||||
iter_tt->prot));
|
||||
}
|
||||
|
||||
static void ttm_kmap_iter_tt_unmap_local(struct ttm_kmap_iter *iter,
|
||||
struct dma_buf_map *map)
|
||||
{
|
||||
kunmap_local(map->vaddr);
|
||||
}
|
||||
|
||||
static const struct ttm_kmap_iter_ops ttm_kmap_iter_tt_ops = {
|
||||
.map_local = ttm_kmap_iter_tt_map_local,
|
||||
.unmap_local = ttm_kmap_iter_tt_unmap_local,
|
||||
.maps_tt = true,
|
||||
};
|
||||
|
||||
/**
|
||||
* ttm_kmap_iter_tt_init - Initialize a struct ttm_kmap_iter_tt
|
||||
* @iter_tt: The struct ttm_kmap_iter_tt to initialize.
|
||||
* @tt: Struct ttm_tt holding page pointers of the struct ttm_resource.
|
||||
*
|
||||
* Return: Pointer to the embedded struct ttm_kmap_iter.
|
||||
*/
|
||||
struct ttm_kmap_iter *
|
||||
ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
|
||||
struct ttm_tt *tt)
|
||||
{
|
||||
iter_tt->base.ops = &ttm_kmap_iter_tt_ops;
|
||||
iter_tt->tt = tt;
|
||||
if (tt)
|
||||
iter_tt->prot = ttm_prot_from_caching(tt->caching, PAGE_KERNEL);
|
||||
else
|
||||
iter_tt->prot = PAGE_KERNEL;
|
||||
|
||||
return &iter_tt->base;
|
||||
}
|
||||
EXPORT_SYMBOL(ttm_kmap_iter_tt_init);
|
||||
|
|
|
|||
|
|
@ -40,6 +40,7 @@
|
|||
#include <drm/ttm/ttm_device.h>
|
||||
|
||||
#include "ttm_bo_api.h"
|
||||
#include "ttm_kmap_iter.h"
|
||||
#include "ttm_placement.h"
|
||||
#include "ttm_tt.h"
|
||||
#include "ttm_pool.h"
|
||||
|
|
@ -270,6 +271,23 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
|
|||
bool pipeline,
|
||||
struct ttm_resource *new_mem);
|
||||
|
||||
/**
|
||||
* ttm_bo_move_accel_cleanup.
|
||||
*
|
||||
* @bo: A pointer to a struct ttm_buffer_object.
|
||||
* @new_mem: struct ttm_resource indicating where to move.
|
||||
*
|
||||
* Special case of ttm_bo_move_accel_cleanup where the bo is guaranteed
|
||||
* by the caller to be idle. Typically used after memcpy buffer moves.
|
||||
*/
|
||||
static inline void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
|
||||
struct ttm_resource *new_mem)
|
||||
{
|
||||
int ret = ttm_bo_move_accel_cleanup(bo, NULL, true, false, new_mem);
|
||||
|
||||
WARN_ON(ret);
|
||||
}
|
||||
|
||||
/**
|
||||
* ttm_bo_pipeline_gutting.
|
||||
*
|
||||
|
|
@ -304,4 +322,14 @@ int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem);
|
|||
*/
|
||||
void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
|
||||
|
||||
void ttm_move_memcpy(struct ttm_buffer_object *bo,
|
||||
u32 num_pages,
|
||||
struct ttm_kmap_iter *dst_iter,
|
||||
struct ttm_kmap_iter *src_iter);
|
||||
|
||||
struct ttm_kmap_iter *
|
||||
ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
|
||||
struct io_mapping *iomap,
|
||||
struct sg_table *st,
|
||||
resource_size_t start);
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -33,4 +33,6 @@ enum ttm_caching {
|
|||
ttm_cached
|
||||
};
|
||||
|
||||
pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -0,0 +1,61 @@
|
|||
/* SPDX-License-Identifier: MIT */
|
||||
/*
|
||||
* Copyright © 2021 Intel Corporation
|
||||
*/
|
||||
#ifndef __TTM_KMAP_ITER_H__
|
||||
#define __TTM_KMAP_ITER_H__
|
||||
|
||||
#include <linux/types.h>
|
||||
|
||||
struct ttm_kmap_iter;
|
||||
struct dma_buf_map;
|
||||
|
||||
/**
|
||||
* struct ttm_kmap_iter_ops - Ops structure for a struct
|
||||
* ttm_kmap_iter.
|
||||
* @maps_tt: Whether the iterator maps TT memory directly, as opposed
|
||||
* mapping a TT through an aperture. Both these modes have
|
||||
* struct ttm_resource_manager::use_tt set, but the latter typically
|
||||
* returns is_iomem == true from ttm_mem_io_reserve.
|
||||
*/
|
||||
struct ttm_kmap_iter_ops {
|
||||
/**
|
||||
* kmap_local() - Map a PAGE_SIZE part of the resource using
|
||||
* kmap_local semantics.
|
||||
* @res_iter: Pointer to the struct ttm_kmap_iter representing
|
||||
* the resource.
|
||||
* @dmap: The struct dma_buf_map holding the virtual address after
|
||||
* the operation.
|
||||
* @i: The location within the resource to map. PAGE_SIZE granularity.
|
||||
*/
|
||||
void (*map_local)(struct ttm_kmap_iter *res_iter,
|
||||
struct dma_buf_map *dmap, pgoff_t i);
|
||||
/**
|
||||
* unmap_local() - Unmap a PAGE_SIZE part of the resource previously
|
||||
* mapped using kmap_local.
|
||||
* @res_iter: Pointer to the struct ttm_kmap_iter representing
|
||||
* the resource.
|
||||
* @dmap: The struct dma_buf_map holding the virtual address after
|
||||
* the operation.
|
||||
*/
|
||||
void (*unmap_local)(struct ttm_kmap_iter *res_iter,
|
||||
struct dma_buf_map *dmap);
|
||||
bool maps_tt;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ttm_kmap_iter - Iterator for kmap_local type operations on a
|
||||
* resource.
|
||||
* @ops: Pointer to the operations struct.
|
||||
*
|
||||
* This struct is intended to be embedded in a resource-specific specialization
|
||||
* implementing operations for the resource.
|
||||
*
|
||||
* Nothing stops us from extending the operations to vmap, vmap_pfn etc,
|
||||
* replacing some or parts of the ttm_bo_util. cpu-map functionality.
|
||||
*/
|
||||
struct ttm_kmap_iter {
|
||||
const struct ttm_kmap_iter_ops *ops;
|
||||
};
|
||||
|
||||
#endif /* __TTM_KMAP_ITER_H__ */
|
||||
|
|
@ -27,9 +27,11 @@
|
|||
|
||||
#include <linux/types.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/dma-buf-map.h>
|
||||
#include <linux/dma-fence.h>
|
||||
#include <drm/drm_print.h>
|
||||
#include <drm/ttm/ttm_caching.h>
|
||||
#include <drm/ttm/ttm_kmap_iter.h>
|
||||
|
||||
#define TTM_MAX_BO_PRIORITY 4U
|
||||
|
||||
|
|
@ -38,6 +40,10 @@ struct ttm_resource_manager;
|
|||
struct ttm_resource;
|
||||
struct ttm_place;
|
||||
struct ttm_buffer_object;
|
||||
struct dma_buf_map;
|
||||
struct io_mapping;
|
||||
struct sg_table;
|
||||
struct scatterlist;
|
||||
|
||||
struct ttm_resource_manager_func {
|
||||
/**
|
||||
|
|
@ -167,6 +173,45 @@ struct ttm_resource {
|
|||
struct ttm_bus_placement bus;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ttm_kmap_iter_iomap - Specialization for a struct io_mapping +
|
||||
* struct sg_table backed struct ttm_resource.
|
||||
* @base: Embedded struct ttm_kmap_iter providing the usage interface.
|
||||
* @iomap: struct io_mapping representing the underlying linear io_memory.
|
||||
* @st: sg_table into @iomap, representing the memory of the struct ttm_resource.
|
||||
* @start: Offset that needs to be subtracted from @st to make
|
||||
* sg_dma_address(st->sgl) - @start == 0 for @iomap start.
|
||||
* @cache: Scatterlist traversal cache for fast lookups.
|
||||
* @cache.sg: Pointer to the currently cached scatterlist segment.
|
||||
* @cache.i: First index of @sg. PAGE_SIZE granularity.
|
||||
* @cache.end: Last index + 1 of @sg. PAGE_SIZE granularity.
|
||||
* @cache.offs: First offset into @iomap of @sg. PAGE_SIZE granularity.
|
||||
*/
|
||||
struct ttm_kmap_iter_iomap {
|
||||
struct ttm_kmap_iter base;
|
||||
struct io_mapping *iomap;
|
||||
struct sg_table *st;
|
||||
resource_size_t start;
|
||||
struct {
|
||||
struct scatterlist *sg;
|
||||
pgoff_t i;
|
||||
pgoff_t end;
|
||||
pgoff_t offs;
|
||||
} cache;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ttm_kmap_iter_linear_io - Iterator specialization for linear io
|
||||
* @base: The base iterator
|
||||
* @dmap: Points to the starting address of the region
|
||||
* @needs_unmap: Whether we need to unmap on fini
|
||||
*/
|
||||
struct ttm_kmap_iter_linear_io {
|
||||
struct ttm_kmap_iter base;
|
||||
struct dma_buf_map dmap;
|
||||
bool needs_unmap;
|
||||
};
|
||||
|
||||
/**
|
||||
* ttm_resource_manager_set_used
|
||||
*
|
||||
|
|
@ -231,4 +276,20 @@ int ttm_resource_manager_evict_all(struct ttm_device *bdev,
|
|||
void ttm_resource_manager_debug(struct ttm_resource_manager *man,
|
||||
struct drm_printer *p);
|
||||
|
||||
struct ttm_kmap_iter *
|
||||
ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
|
||||
struct io_mapping *iomap,
|
||||
struct sg_table *st,
|
||||
resource_size_t start);
|
||||
|
||||
struct ttm_kmap_iter_linear_io;
|
||||
|
||||
struct ttm_kmap_iter *
|
||||
ttm_kmap_iter_linear_io_init(struct ttm_kmap_iter_linear_io *iter_io,
|
||||
struct ttm_device *bdev,
|
||||
struct ttm_resource *mem);
|
||||
|
||||
void ttm_kmap_iter_linear_io_fini(struct ttm_kmap_iter_linear_io *iter_io,
|
||||
struct ttm_device *bdev,
|
||||
struct ttm_resource *mem);
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -29,6 +29,7 @@
|
|||
|
||||
#include <linux/types.h>
|
||||
#include <drm/ttm/ttm_caching.h>
|
||||
#include <drm/ttm/ttm_kmap_iter.h>
|
||||
|
||||
struct ttm_bo_device;
|
||||
struct ttm_tt;
|
||||
|
|
@ -69,6 +70,18 @@ struct ttm_tt {
|
|||
enum ttm_caching caching;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ttm_kmap_iter_tt - Specialization of a mappig iterator for a tt.
|
||||
* @base: Embedded struct ttm_kmap_iter providing the usage interface
|
||||
* @tt: Cached struct ttm_tt.
|
||||
* @prot: Cached page protection for mapping.
|
||||
*/
|
||||
struct ttm_kmap_iter_tt {
|
||||
struct ttm_kmap_iter base;
|
||||
struct ttm_tt *tt;
|
||||
pgprot_t prot;
|
||||
};
|
||||
|
||||
static inline bool ttm_tt_is_populated(struct ttm_tt *tt)
|
||||
{
|
||||
return tt->page_flags & TTM_PAGE_FLAG_PRIV_POPULATED;
|
||||
|
|
@ -159,6 +172,9 @@ void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm);
|
|||
|
||||
void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages);
|
||||
|
||||
struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
|
||||
struct ttm_tt *tt);
|
||||
|
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#if IS_ENABLED(CONFIG_AGP)
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#include <linux/agp_backend.h>
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