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13 Jun 2024 15:13:37 -0700 From: Vivek Kasireddy To: dri-devel@lists.freedesktop.org, linux-mm@kvack.org Cc: Vivek Kasireddy , David Hildenbrand , Matthew Wilcox , Daniel Vetter , Hugh Dickins , Peter Xu , Jason Gunthorpe , Gerd Hoffmann , Dongwon Kim , Junxiao Chang , Dave Airlie Subject: [PATCH v15 7/9] udmabuf: Convert udmabuf driver to use folios Date: Thu, 13 Jun 2024 14:42:09 -0700 Message-ID: <20240613214741.1029446-8-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240613214741.1029446-1-vivek.kasireddy@intel.com> References: <20240613214741.1029446-1-vivek.kasireddy@intel.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 2BF7220014 X-Stat-Signature: 8h9cujrs84oam3t68dw8twhwk8pcmd7n X-HE-Tag: 1718316823-527762 X-HE-Meta: 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 4gj8qrnm qw5SFoEBe1O36a4L/PwFg8X/GdYeU1yoCr895MO8REcVhybbTUhCgicEf4ai+DGCZfcvSGsuPwJZol64lpmIZi33uw+NvoR8idUPZSCC1BscdY77ByrRqvGB/g2dhl8v1STpfqRst0oUYG6Avr4U32Zg9IftjD3bHeUQ1hlGNKM4SokvjxoVBYOJl8EmVA5VKYxBpGX540Iwk+HD6bEZDrH1Oe0r92e5a5YpeTXNskZHoi2ELKg0yu5rVsjIhJ0geIC+Aa1rnjZ140ApqoitUeeSf1xMytMp/ZxDO X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This is mainly a preparatory patch to use memfd_pin_folios() API for pinning folios. Using folios instead of pages makes sense as the udmabuf driver needs to handle both shmem and hugetlb cases. And, using the memfd_pin_folios() API makes this easier as we no longer need to separately handle shmem vs hugetlb cases in the udmabuf driver. Note that, the function vmap_udmabuf() still needs a list of pages; so, we collect all the head pages into a local array in this case. Other changes in this patch include the addition of helpers for checking the memfd seals and exporting dmabuf. Moving code from udmabuf_create() into these helpers improves readability given that udmabuf_create() is a bit long. Cc: David Hildenbrand Cc: Matthew Wilcox Cc: Daniel Vetter Cc: Hugh Dickins Cc: Peter Xu Cc: Jason Gunthorpe Cc: Gerd Hoffmann Cc: Dongwon Kim Cc: Junxiao Chang Acked-by: Dave Airlie Acked-by: Gerd Hoffmann Signed-off-by: Vivek Kasireddy --- drivers/dma-buf/udmabuf.c | 139 +++++++++++++++++++++++--------------- 1 file changed, 83 insertions(+), 56 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index 274defd3fa3e..e67515808ed3 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -26,7 +26,7 @@ MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is struct udmabuf { pgoff_t pagecount; - struct page **pages; + struct folio **folios; struct sg_table *sg; struct miscdevice *device; pgoff_t *offsets; @@ -42,7 +42,7 @@ static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) if (pgoff >= ubuf->pagecount) return VM_FAULT_SIGBUS; - pfn = page_to_pfn(ubuf->pages[pgoff]); + pfn = folio_pfn(ubuf->folios[pgoff]); pfn += ubuf->offsets[pgoff] >> PAGE_SHIFT; return vmf_insert_pfn(vma, vmf->address, pfn); @@ -68,11 +68,21 @@ static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma) static int vmap_udmabuf(struct dma_buf *buf, struct iosys_map *map) { struct udmabuf *ubuf = buf->priv; + struct page **pages; void *vaddr; + pgoff_t pg; dma_resv_assert_held(buf->resv); - vaddr = vm_map_ram(ubuf->pages, ubuf->pagecount, -1); + pages = kmalloc_array(ubuf->pagecount, sizeof(*pages), GFP_KERNEL); + if (!pages) + return -ENOMEM; + + for (pg = 0; pg < ubuf->pagecount; pg++) + pages[pg] = &ubuf->folios[pg]->page; + + vaddr = vm_map_ram(pages, ubuf->pagecount, -1); + kfree(pages); if (!vaddr) return -EINVAL; @@ -107,7 +117,8 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, goto err_alloc; for_each_sg(sg->sgl, sgl, ubuf->pagecount, i) - sg_set_page(sgl, ubuf->pages[i], PAGE_SIZE, ubuf->offsets[i]); + sg_set_folio(sgl, ubuf->folios[i], PAGE_SIZE, + ubuf->offsets[i]); ret = dma_map_sgtable(dev, sg, direction, 0); if (ret < 0) @@ -152,9 +163,9 @@ static void release_udmabuf(struct dma_buf *buf) put_sg_table(dev, ubuf->sg, DMA_BIDIRECTIONAL); for (pg = 0; pg < ubuf->pagecount; pg++) - put_page(ubuf->pages[pg]); + folio_put(ubuf->folios[pg]); kfree(ubuf->offsets); - kfree(ubuf->pages); + kfree(ubuf->folios); kfree(ubuf); } @@ -215,36 +226,33 @@ static int handle_hugetlb_pages(struct udmabuf *ubuf, struct file *memfd, pgoff_t mapidx = offset >> huge_page_shift(hpstate); pgoff_t subpgoff = (offset & ~huge_page_mask(hpstate)) >> PAGE_SHIFT; pgoff_t maxsubpgs = huge_page_size(hpstate) >> PAGE_SHIFT; - struct page *hpage = NULL; - struct folio *folio; + struct folio *folio = NULL; pgoff_t pgidx; mapidx <<= huge_page_order(hpstate); for (pgidx = 0; pgidx < pgcnt; pgidx++) { - if (!hpage) { + if (!folio) { folio = __filemap_get_folio(memfd->f_mapping, mapidx, FGP_ACCESSED, 0); if (IS_ERR(folio)) return PTR_ERR(folio); - - hpage = &folio->page; } - get_page(hpage); - ubuf->pages[*pgbuf] = hpage; + folio_get(folio); + ubuf->folios[*pgbuf] = folio; ubuf->offsets[*pgbuf] = subpgoff << PAGE_SHIFT; (*pgbuf)++; if (++subpgoff == maxsubpgs) { - put_page(hpage); - hpage = NULL; + folio_put(folio); + folio = NULL; subpgoff = 0; mapidx += pages_per_huge_page(hpstate); } } - if (hpage) - put_page(hpage); + if (folio) + folio_put(folio); return 0; } @@ -254,31 +262,69 @@ static int handle_shmem_pages(struct udmabuf *ubuf, struct file *memfd, pgoff_t *pgbuf) { pgoff_t pgidx, pgoff = offset >> PAGE_SHIFT; - struct page *page; + struct folio *folio = NULL; for (pgidx = 0; pgidx < pgcnt; pgidx++) { - page = shmem_read_mapping_page(memfd->f_mapping, - pgoff + pgidx); - if (IS_ERR(page)) - return PTR_ERR(page); + folio = shmem_read_folio(memfd->f_mapping, pgoff + pgidx); + if (IS_ERR(folio)) + return PTR_ERR(folio); - ubuf->pages[*pgbuf] = page; + ubuf->folios[*pgbuf] = folio; (*pgbuf)++; } return 0; } +static int check_memfd_seals(struct file *memfd) +{ + int seals; + + if (!memfd) + return -EBADFD; + + if (!shmem_file(memfd) && !is_file_hugepages(memfd)) + return -EBADFD; + + seals = memfd_fcntl(memfd, F_GET_SEALS, 0); + if (seals == -EINVAL) + return -EBADFD; + + if ((seals & SEALS_WANTED) != SEALS_WANTED || + (seals & SEALS_DENIED) != 0) + return -EINVAL; + + return 0; +} + +static int export_udmabuf(struct udmabuf *ubuf, + struct miscdevice *device, + u32 flags) +{ + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + struct dma_buf *buf; + + ubuf->device = device; + exp_info.ops = &udmabuf_ops; + exp_info.size = ubuf->pagecount << PAGE_SHIFT; + exp_info.priv = ubuf; + exp_info.flags = O_RDWR; + + buf = dma_buf_export(&exp_info); + if (IS_ERR(buf)) + return PTR_ERR(buf); + + return dma_buf_fd(buf, flags); +} + static long udmabuf_create(struct miscdevice *device, struct udmabuf_create_list *head, struct udmabuf_create_item *list) { - DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + pgoff_t pgcnt, pgbuf = 0, pglimit; struct file *memfd = NULL; struct udmabuf *ubuf; - struct dma_buf *buf; - pgoff_t pgcnt, pgbuf = 0, pglimit; - int seals, ret = -EINVAL; + int ret = -EINVAL; u32 i, flags; ubuf = kzalloc(sizeof(*ubuf), GFP_KERNEL); @@ -299,9 +345,9 @@ static long udmabuf_create(struct miscdevice *device, if (!ubuf->pagecount) goto err; - ubuf->pages = kmalloc_array(ubuf->pagecount, sizeof(*ubuf->pages), + ubuf->folios = kmalloc_array(ubuf->pagecount, sizeof(*ubuf->folios), GFP_KERNEL); - if (!ubuf->pages) { + if (!ubuf->folios) { ret = -ENOMEM; goto err; } @@ -314,18 +360,9 @@ static long udmabuf_create(struct miscdevice *device, pgbuf = 0; for (i = 0; i < head->count; i++) { - ret = -EBADFD; memfd = fget(list[i].memfd); - if (!memfd) - goto err; - if (!shmem_file(memfd) && !is_file_hugepages(memfd)) - goto err; - seals = memfd_fcntl(memfd, F_GET_SEALS, 0); - if (seals == -EINVAL) - goto err; - ret = -EINVAL; - if ((seals & SEALS_WANTED) != SEALS_WANTED || - (seals & SEALS_DENIED) != 0) + ret = check_memfd_seals(memfd); + if (ret < 0) goto err; pgcnt = list[i].size >> PAGE_SHIFT; @@ -344,30 +381,20 @@ static long udmabuf_create(struct miscdevice *device, memfd = NULL; } - exp_info.ops = &udmabuf_ops; - exp_info.size = ubuf->pagecount << PAGE_SHIFT; - exp_info.priv = ubuf; - exp_info.flags = O_RDWR; - - ubuf->device = device; - buf = dma_buf_export(&exp_info); - if (IS_ERR(buf)) { - ret = PTR_ERR(buf); + flags = head->flags & UDMABUF_FLAGS_CLOEXEC ? O_CLOEXEC : 0; + ret = export_udmabuf(ubuf, device, flags); + if (ret < 0) goto err; - } - flags = 0; - if (head->flags & UDMABUF_FLAGS_CLOEXEC) - flags |= O_CLOEXEC; - return dma_buf_fd(buf, flags); + return ret; err: while (pgbuf > 0) - put_page(ubuf->pages[--pgbuf]); + folio_put(ubuf->folios[--pgbuf]); if (memfd) fput(memfd); kfree(ubuf->offsets); - kfree(ubuf->pages); + kfree(ubuf->folios); kfree(ubuf); return ret; }