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![Lorenzo Stoakes](/assets/img/avatar_default.png)
We are now in a position where no caller of pin_user_pages() requires the vmas parameter at all, so eliminate this parameter from the function and all callers. This clears the way to removing the vmas parameter from GUP altogether. Link: https://lkml.kernel.org/r/195a99ae949c9f5cb589d2222b736ced96ec199a.1684350871.git.lstoakes@gmail.com Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com> [qib] Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> [drivers/media] Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian König <christian.koenig@amd.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Janosch Frank <frankja@linux.ibm.com> Cc: Jarkko Sakkinen <jarkko@kernel.org> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Sean Christopherson <seanjc@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
681 lines
16 KiB
C
681 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* helper functions for SG DMA video4linux capture buffers
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*
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* The functions expect the hardware being able to scatter gather
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* (i.e. the buffers are not linear in physical memory, but fragmented
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* into PAGE_SIZE chunks). They also assume the driver does not need
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* to touch the video data.
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*
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* (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
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*
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* Highly based on video-buf written originally by:
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* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
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* (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org>
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* (c) 2006 Ted Walther and John Sokol
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/sched/mm.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/pgtable.h>
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#include <linux/dma-mapping.h>
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#include <linux/vmalloc.h>
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#include <linux/pagemap.h>
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#include <linux/scatterlist.h>
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#include <asm/page.h>
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#include <media/videobuf-dma-sg.h>
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#define MAGIC_DMABUF 0x19721112
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#define MAGIC_SG_MEM 0x17890714
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#define MAGIC_CHECK(is, should) \
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if (unlikely((is) != (should))) { \
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printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \
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is, should); \
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BUG(); \
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}
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static int debug;
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module_param(debug, int, 0644);
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MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
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MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
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MODULE_LICENSE("GPL");
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#define dprintk(level, fmt, arg...) \
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if (debug >= level) \
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printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
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/* --------------------------------------------------------------------- */
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/*
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* Return a scatterlist for some page-aligned vmalloc()'ed memory
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* block (NULL on errors). Memory for the scatterlist is allocated
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* using kmalloc. The caller must free the memory.
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*/
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static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt,
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int nr_pages)
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{
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struct scatterlist *sglist;
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struct page *pg;
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int i;
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sglist = vzalloc(array_size(nr_pages, sizeof(*sglist)));
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if (NULL == sglist)
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return NULL;
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sg_init_table(sglist, nr_pages);
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for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
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pg = vmalloc_to_page(virt);
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if (NULL == pg)
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goto err;
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BUG_ON(PageHighMem(pg));
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sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
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}
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return sglist;
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err:
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vfree(sglist);
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return NULL;
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}
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/*
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* Return a scatterlist for a an array of userpages (NULL on errors).
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* Memory for the scatterlist is allocated using kmalloc. The caller
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* must free the memory.
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*/
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static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
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int nr_pages, int offset, size_t size)
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{
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struct scatterlist *sglist;
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int i;
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if (NULL == pages[0])
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return NULL;
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sglist = vmalloc(array_size(nr_pages, sizeof(*sglist)));
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if (NULL == sglist)
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return NULL;
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sg_init_table(sglist, nr_pages);
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if (PageHighMem(pages[0]))
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/* DMA to highmem pages might not work */
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goto highmem;
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sg_set_page(&sglist[0], pages[0],
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min_t(size_t, PAGE_SIZE - offset, size), offset);
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size -= min_t(size_t, PAGE_SIZE - offset, size);
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for (i = 1; i < nr_pages; i++) {
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if (NULL == pages[i])
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goto nopage;
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if (PageHighMem(pages[i]))
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goto highmem;
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sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0);
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size -= min_t(size_t, PAGE_SIZE, size);
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}
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return sglist;
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nopage:
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dprintk(2, "sgl: oops - no page\n");
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vfree(sglist);
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return NULL;
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highmem:
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dprintk(2, "sgl: oops - highmem page\n");
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vfree(sglist);
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return NULL;
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}
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/* --------------------------------------------------------------------- */
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struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf)
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{
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struct videobuf_dma_sg_memory *mem = buf->priv;
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BUG_ON(!mem);
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
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return &mem->dma;
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}
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EXPORT_SYMBOL_GPL(videobuf_to_dma);
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static void videobuf_dma_init(struct videobuf_dmabuf *dma)
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{
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memset(dma, 0, sizeof(*dma));
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dma->magic = MAGIC_DMABUF;
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}
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static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
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int direction, unsigned long data, unsigned long size)
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{
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unsigned int gup_flags = FOLL_LONGTERM;
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unsigned long first, last;
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int err;
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dma->direction = direction;
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switch (dma->direction) {
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case DMA_FROM_DEVICE:
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gup_flags |= FOLL_WRITE;
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break;
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case DMA_TO_DEVICE:
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break;
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default:
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BUG();
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}
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first = (data & PAGE_MASK) >> PAGE_SHIFT;
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last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
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dma->offset = data & ~PAGE_MASK;
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dma->size = size;
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dma->nr_pages = last-first+1;
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dma->pages = kmalloc_array(dma->nr_pages, sizeof(struct page *),
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GFP_KERNEL);
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if (NULL == dma->pages)
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return -ENOMEM;
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dprintk(1, "init user [0x%lx+0x%lx => %lu pages]\n",
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data, size, dma->nr_pages);
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err = pin_user_pages(data & PAGE_MASK, dma->nr_pages, gup_flags,
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dma->pages);
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if (err != dma->nr_pages) {
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dma->nr_pages = (err >= 0) ? err : 0;
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dprintk(1, "pin_user_pages: err=%d [%lu]\n", err,
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dma->nr_pages);
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return err < 0 ? err : -EINVAL;
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}
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return 0;
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}
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static int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
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unsigned long data, unsigned long size)
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{
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int ret;
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mmap_read_lock(current->mm);
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ret = videobuf_dma_init_user_locked(dma, direction, data, size);
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mmap_read_unlock(current->mm);
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return ret;
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}
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static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
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unsigned long nr_pages)
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{
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int i;
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dprintk(1, "init kernel [%lu pages]\n", nr_pages);
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dma->direction = direction;
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dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages),
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GFP_KERNEL);
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if (!dma->vaddr_pages)
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return -ENOMEM;
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dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL);
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if (!dma->dma_addr) {
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kfree(dma->vaddr_pages);
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return -ENOMEM;
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}
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for (i = 0; i < nr_pages; i++) {
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void *addr;
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addr = dma_alloc_coherent(dma->dev, PAGE_SIZE,
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&(dma->dma_addr[i]), GFP_KERNEL);
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if (addr == NULL)
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goto out_free_pages;
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dma->vaddr_pages[i] = virt_to_page(addr);
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}
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dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP,
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PAGE_KERNEL);
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if (NULL == dma->vaddr) {
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dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
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goto out_free_pages;
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}
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dprintk(1, "vmalloc is at addr %p, size=%lu\n",
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dma->vaddr, nr_pages << PAGE_SHIFT);
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memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
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dma->nr_pages = nr_pages;
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return 0;
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out_free_pages:
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while (i > 0) {
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void *addr;
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i--;
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addr = page_address(dma->vaddr_pages[i]);
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dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]);
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}
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kfree(dma->dma_addr);
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dma->dma_addr = NULL;
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kfree(dma->vaddr_pages);
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dma->vaddr_pages = NULL;
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return -ENOMEM;
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}
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static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
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dma_addr_t addr, unsigned long nr_pages)
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{
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dprintk(1, "init overlay [%lu pages @ bus 0x%lx]\n",
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nr_pages, (unsigned long)addr);
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dma->direction = direction;
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if (0 == addr)
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return -EINVAL;
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dma->bus_addr = addr;
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dma->nr_pages = nr_pages;
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return 0;
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}
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static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
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{
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MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
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BUG_ON(0 == dma->nr_pages);
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if (dma->pages) {
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dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
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dma->offset, dma->size);
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}
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if (dma->vaddr) {
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dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr,
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dma->nr_pages);
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}
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if (dma->bus_addr) {
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dma->sglist = vmalloc(sizeof(*dma->sglist));
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if (NULL != dma->sglist) {
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dma->sglen = 1;
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sg_dma_address(&dma->sglist[0]) = dma->bus_addr
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& PAGE_MASK;
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dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
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sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
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}
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}
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if (NULL == dma->sglist) {
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dprintk(1, "scatterlist is NULL\n");
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return -ENOMEM;
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}
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if (!dma->bus_addr) {
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dma->sglen = dma_map_sg(dev, dma->sglist,
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dma->nr_pages, dma->direction);
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if (0 == dma->sglen) {
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printk(KERN_WARNING
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"%s: videobuf_map_sg failed\n", __func__);
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vfree(dma->sglist);
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dma->sglist = NULL;
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dma->sglen = 0;
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return -ENOMEM;
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}
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}
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return 0;
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}
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int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
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{
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MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
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if (!dma->sglen)
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return 0;
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dma_unmap_sg(dev, dma->sglist, dma->nr_pages, dma->direction);
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vfree(dma->sglist);
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dma->sglist = NULL;
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dma->sglen = 0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
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int videobuf_dma_free(struct videobuf_dmabuf *dma)
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{
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int i;
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MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
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BUG_ON(dma->sglen);
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if (dma->pages) {
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unpin_user_pages_dirty_lock(dma->pages, dma->nr_pages,
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dma->direction == DMA_FROM_DEVICE);
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kfree(dma->pages);
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dma->pages = NULL;
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}
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if (dma->dma_addr) {
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for (i = 0; i < dma->nr_pages; i++) {
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void *addr;
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addr = page_address(dma->vaddr_pages[i]);
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dma_free_coherent(dma->dev, PAGE_SIZE, addr,
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dma->dma_addr[i]);
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}
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kfree(dma->dma_addr);
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dma->dma_addr = NULL;
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kfree(dma->vaddr_pages);
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dma->vaddr_pages = NULL;
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vunmap(dma->vaddr);
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dma->vaddr = NULL;
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}
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if (dma->bus_addr)
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dma->bus_addr = 0;
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dma->direction = DMA_NONE;
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return 0;
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}
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EXPORT_SYMBOL_GPL(videobuf_dma_free);
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/* --------------------------------------------------------------------- */
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static void videobuf_vm_open(struct vm_area_struct *vma)
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{
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struct videobuf_mapping *map = vma->vm_private_data;
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dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map,
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map->count, vma->vm_start, vma->vm_end);
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map->count++;
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}
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static void videobuf_vm_close(struct vm_area_struct *vma)
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{
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struct videobuf_mapping *map = vma->vm_private_data;
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struct videobuf_queue *q = map->q;
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struct videobuf_dma_sg_memory *mem;
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int i;
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dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map,
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map->count, vma->vm_start, vma->vm_end);
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map->count--;
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if (0 == map->count) {
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dprintk(1, "munmap %p q=%p\n", map, q);
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videobuf_queue_lock(q);
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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mem = q->bufs[i]->priv;
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if (!mem)
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continue;
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
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if (q->bufs[i]->map != map)
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continue;
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q->bufs[i]->map = NULL;
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q->bufs[i]->baddr = 0;
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q->ops->buf_release(q, q->bufs[i]);
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}
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videobuf_queue_unlock(q);
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kfree(map);
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}
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}
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/*
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* Get a anonymous page for the mapping. Make sure we can DMA to that
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* memory location with 32bit PCI devices (i.e. don't use highmem for
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* now ...). Bounce buffers don't work very well for the data rates
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* video capture has.
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*/
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static vm_fault_t videobuf_vm_fault(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct page *page;
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dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n",
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vmf->address, vma->vm_start, vma->vm_end);
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page = alloc_page(GFP_USER | __GFP_DMA32);
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if (!page)
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return VM_FAULT_OOM;
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clear_user_highpage(page, vmf->address);
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vmf->page = page;
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return 0;
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}
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static const struct vm_operations_struct videobuf_vm_ops = {
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.open = videobuf_vm_open,
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.close = videobuf_vm_close,
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.fault = videobuf_vm_fault,
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};
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/* ---------------------------------------------------------------------
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* SG handlers for the generic methods
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*/
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/* Allocated area consists on 3 parts:
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struct video_buffer
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struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
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struct videobuf_dma_sg_memory
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*/
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static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
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{
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struct videobuf_dma_sg_memory *mem;
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struct videobuf_buffer *vb;
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vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
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if (!vb)
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return vb;
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mem = vb->priv = ((char *)vb) + size;
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mem->magic = MAGIC_SG_MEM;
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videobuf_dma_init(&mem->dma);
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dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
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__func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb),
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mem, (long)sizeof(*mem));
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return vb;
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}
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static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
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{
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struct videobuf_dma_sg_memory *mem = buf->priv;
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BUG_ON(!mem);
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MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
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return mem->dma.vaddr;
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}
|
|
|
|
static int __videobuf_iolock(struct videobuf_queue *q,
|
|
struct videobuf_buffer *vb,
|
|
struct v4l2_framebuffer *fbuf)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem = vb->priv;
|
|
unsigned long pages;
|
|
dma_addr_t bus;
|
|
int err;
|
|
|
|
BUG_ON(!mem);
|
|
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
|
|
if (!mem->dma.dev)
|
|
mem->dma.dev = q->dev;
|
|
else
|
|
WARN_ON(mem->dma.dev != q->dev);
|
|
|
|
switch (vb->memory) {
|
|
case V4L2_MEMORY_MMAP:
|
|
case V4L2_MEMORY_USERPTR:
|
|
if (0 == vb->baddr) {
|
|
/* no userspace addr -- kernel bounce buffer */
|
|
pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
|
|
err = videobuf_dma_init_kernel(&mem->dma,
|
|
DMA_FROM_DEVICE,
|
|
pages);
|
|
if (0 != err)
|
|
return err;
|
|
} else if (vb->memory == V4L2_MEMORY_USERPTR) {
|
|
/* dma directly to userspace */
|
|
err = videobuf_dma_init_user(&mem->dma,
|
|
DMA_FROM_DEVICE,
|
|
vb->baddr, vb->bsize);
|
|
if (0 != err)
|
|
return err;
|
|
} else {
|
|
/* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
|
|
buffers can only be called from videobuf_qbuf
|
|
we take current->mm->mmap_lock there, to prevent
|
|
locking inversion, so don't take it here */
|
|
|
|
err = videobuf_dma_init_user_locked(&mem->dma,
|
|
DMA_FROM_DEVICE,
|
|
vb->baddr, vb->bsize);
|
|
if (0 != err)
|
|
return err;
|
|
}
|
|
break;
|
|
case V4L2_MEMORY_OVERLAY:
|
|
if (NULL == fbuf)
|
|
return -EINVAL;
|
|
/* FIXME: need sanity checks for vb->boff */
|
|
/*
|
|
* Using a double cast to avoid compiler warnings when
|
|
* building for PAE. Compiler doesn't like direct casting
|
|
* of a 32 bit ptr to 64 bit integer.
|
|
*/
|
|
bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
|
|
pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
|
|
err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
|
|
bus, pages);
|
|
if (0 != err)
|
|
return err;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
err = videobuf_dma_map(q->dev, &mem->dma);
|
|
if (0 != err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __videobuf_sync(struct videobuf_queue *q,
|
|
struct videobuf_buffer *buf)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem = buf->priv;
|
|
BUG_ON(!mem || !mem->dma.sglen);
|
|
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF);
|
|
|
|
dma_sync_sg_for_cpu(q->dev, mem->dma.sglist,
|
|
mem->dma.nr_pages, mem->dma.direction);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __videobuf_mmap_mapper(struct videobuf_queue *q,
|
|
struct videobuf_buffer *buf,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct videobuf_dma_sg_memory *mem = buf->priv;
|
|
struct videobuf_mapping *map;
|
|
unsigned int first, last, size = 0, i;
|
|
int retval;
|
|
|
|
retval = -EINVAL;
|
|
|
|
BUG_ON(!mem);
|
|
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
|
|
|
/* look for first buffer to map */
|
|
for (first = 0; first < VIDEO_MAX_FRAME; first++) {
|
|
if (buf == q->bufs[first]) {
|
|
size = PAGE_ALIGN(q->bufs[first]->bsize);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* paranoia, should never happen since buf is always valid. */
|
|
if (!size) {
|
|
dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n",
|
|
(vma->vm_pgoff << PAGE_SHIFT));
|
|
goto done;
|
|
}
|
|
|
|
last = first;
|
|
|
|
/* create mapping + update buffer list */
|
|
retval = -ENOMEM;
|
|
map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
|
|
if (NULL == map)
|
|
goto done;
|
|
|
|
size = 0;
|
|
for (i = first; i <= last; i++) {
|
|
if (NULL == q->bufs[i])
|
|
continue;
|
|
q->bufs[i]->map = map;
|
|
q->bufs[i]->baddr = vma->vm_start + size;
|
|
size += PAGE_ALIGN(q->bufs[i]->bsize);
|
|
}
|
|
|
|
map->count = 1;
|
|
map->q = q;
|
|
vma->vm_ops = &videobuf_vm_ops;
|
|
/* using shared anonymous pages */
|
|
vm_flags_mod(vma, VM_DONTEXPAND | VM_DONTDUMP, VM_IO);
|
|
vma->vm_private_data = map;
|
|
dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
|
|
map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last);
|
|
retval = 0;
|
|
|
|
done:
|
|
return retval;
|
|
}
|
|
|
|
static struct videobuf_qtype_ops sg_ops = {
|
|
.magic = MAGIC_QTYPE_OPS,
|
|
|
|
.alloc_vb = __videobuf_alloc_vb,
|
|
.iolock = __videobuf_iolock,
|
|
.sync = __videobuf_sync,
|
|
.mmap_mapper = __videobuf_mmap_mapper,
|
|
.vaddr = __videobuf_to_vaddr,
|
|
};
|
|
|
|
void *videobuf_sg_alloc(size_t size)
|
|
{
|
|
struct videobuf_queue q;
|
|
|
|
/* Required to make generic handler to call __videobuf_alloc */
|
|
q.int_ops = &sg_ops;
|
|
|
|
q.msize = size;
|
|
|
|
return videobuf_alloc_vb(&q);
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
|
|
|
|
void videobuf_queue_sg_init(struct videobuf_queue *q,
|
|
const struct videobuf_queue_ops *ops,
|
|
struct device *dev,
|
|
spinlock_t *irqlock,
|
|
enum v4l2_buf_type type,
|
|
enum v4l2_field field,
|
|
unsigned int msize,
|
|
void *priv,
|
|
struct mutex *ext_lock)
|
|
{
|
|
videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
|
|
priv, &sg_ops, ext_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
|
|
|