mirror of
https://github.com/tbsdtv/linux_media.git
synced 2025-07-23 04:33:26 +02:00
Revert "media: remove the old videobuf framework"
This reverts commit 261d98c7cf
.
This commit is contained in:
@@ -73,3 +73,19 @@ config V4L2_FWNODE
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config V4L2_ASYNC
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tristate
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# Used by drivers that need Videobuf modules
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config VIDEOBUF_GEN
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tristate
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config VIDEOBUF_DMA_SG
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tristate
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select VIDEOBUF_GEN
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config VIDEOBUF_VMALLOC
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tristate
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select VIDEOBUF_GEN
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config VIDEOBUF_DMA_CONTIG
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tristate
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select VIDEOBUF_GEN
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1198
drivers/media/v4l2-core/videobuf-core.c
Normal file
1198
drivers/media/v4l2-core/videobuf-core.c
Normal file
File diff suppressed because it is too large
Load Diff
402
drivers/media/v4l2-core/videobuf-dma-contig.c
Normal file
402
drivers/media/v4l2-core/videobuf-dma-contig.c
Normal file
@@ -0,0 +1,402 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* helper functions for physically contiguous capture buffers
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*
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* The functions support hardware lacking scatter gather support
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* (i.e. the buffers must be linear in physical memory)
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*
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* Copyright (c) 2008 Magnus Damm
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*
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* Based on videobuf-vmalloc.c,
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* (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
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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/mm.h>
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#include <linux/pagemap.h>
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#include <linux/dma-mapping.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <media/videobuf-dma-contig.h>
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struct videobuf_dma_contig_memory {
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u32 magic;
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void *vaddr;
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dma_addr_t dma_handle;
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unsigned long size;
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};
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#define MAGIC_DC_MEM 0x0733ac61
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#define MAGIC_CHECK(is, should) \
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if (unlikely((is) != (should))) { \
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pr_err("magic mismatch: %x expected %x\n", (is), (should)); \
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BUG(); \
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}
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static int __videobuf_dc_alloc(struct device *dev,
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struct videobuf_dma_contig_memory *mem,
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unsigned long size)
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{
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mem->size = size;
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mem->vaddr = dma_alloc_coherent(dev, mem->size, &mem->dma_handle,
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GFP_KERNEL);
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if (!mem->vaddr) {
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dev_err(dev, "memory alloc size %ld failed\n", mem->size);
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return -ENOMEM;
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}
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dev_dbg(dev, "dma mapped data is at %p (%ld)\n", mem->vaddr, mem->size);
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return 0;
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}
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static void __videobuf_dc_free(struct device *dev,
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struct videobuf_dma_contig_memory *mem)
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{
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dma_free_coherent(dev, mem->size, mem->vaddr, mem->dma_handle);
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mem->vaddr = NULL;
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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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dev_dbg(map->q->dev, "vm_open %p [count=%u,vma=%08lx-%08lx]\n",
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map, 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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int i;
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dev_dbg(q->dev, "vm_close %p [count=%u,vma=%08lx-%08lx]\n",
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map, 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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struct videobuf_dma_contig_memory *mem;
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dev_dbg(q->dev, "munmap %p q=%p\n", map, q);
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videobuf_queue_lock(q);
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/* We need first to cancel streams, before unmapping */
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if (q->streaming)
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videobuf_queue_cancel(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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if (q->bufs[i]->map != map)
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continue;
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mem = q->bufs[i]->priv;
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if (mem) {
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/* This callback is called only if kernel has
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allocated memory and this memory is mmapped.
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In this case, memory should be freed,
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in order to do memory unmap.
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*/
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MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
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/* vfree is not atomic - can't be
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called with IRQ's disabled
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*/
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dev_dbg(q->dev, "buf[%d] freeing %p\n",
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i, mem->vaddr);
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__videobuf_dc_free(q->dev, mem);
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mem->vaddr = NULL;
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}
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q->bufs[i]->map = NULL;
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q->bufs[i]->baddr = 0;
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}
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kfree(map);
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videobuf_queue_unlock(q);
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}
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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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};
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/**
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* videobuf_dma_contig_user_put() - reset pointer to user space buffer
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* @mem: per-buffer private videobuf-dma-contig data
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*
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* This function resets the user space pointer
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*/
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static void videobuf_dma_contig_user_put(struct videobuf_dma_contig_memory *mem)
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{
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mem->dma_handle = 0;
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mem->size = 0;
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}
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/**
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* videobuf_dma_contig_user_get() - setup user space memory pointer
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* @mem: per-buffer private videobuf-dma-contig data
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* @vb: video buffer to map
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*
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* This function validates and sets up a pointer to user space memory.
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* Only physically contiguous pfn-mapped memory is accepted.
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*
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* Returns 0 if successful.
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*/
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static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem,
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struct videobuf_buffer *vb)
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{
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unsigned long untagged_baddr = untagged_addr(vb->baddr);
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long prev_pfn, this_pfn;
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unsigned long pages_done, user_address;
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unsigned int offset;
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int ret;
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offset = untagged_baddr & ~PAGE_MASK;
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mem->size = PAGE_ALIGN(vb->size + offset);
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ret = -EINVAL;
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mmap_read_lock(mm);
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vma = find_vma(mm, untagged_baddr);
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if (!vma)
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goto out_up;
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if ((untagged_baddr + mem->size) > vma->vm_end)
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goto out_up;
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pages_done = 0;
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prev_pfn = 0; /* kill warning */
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user_address = untagged_baddr;
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while (pages_done < (mem->size >> PAGE_SHIFT)) {
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ret = follow_pfn(vma, user_address, &this_pfn);
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if (ret)
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break;
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if (pages_done == 0)
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mem->dma_handle = (this_pfn << PAGE_SHIFT) + offset;
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else if (this_pfn != (prev_pfn + 1))
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ret = -EFAULT;
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if (ret)
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break;
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prev_pfn = this_pfn;
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user_address += PAGE_SIZE;
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pages_done++;
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}
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out_up:
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mmap_read_unlock(current->mm);
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return ret;
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}
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static struct videobuf_buffer *__videobuf_alloc(size_t size)
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{
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struct videobuf_dma_contig_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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vb->priv = ((char *)vb) + size;
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mem = vb->priv;
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mem->magic = MAGIC_DC_MEM;
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}
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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_contig_memory *mem = buf->priv;
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BUG_ON(!mem);
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MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
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return mem->vaddr;
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}
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static int __videobuf_iolock(struct videobuf_queue *q,
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struct videobuf_buffer *vb,
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struct v4l2_framebuffer *fbuf)
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{
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struct videobuf_dma_contig_memory *mem = vb->priv;
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BUG_ON(!mem);
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MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
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switch (vb->memory) {
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case V4L2_MEMORY_MMAP:
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dev_dbg(q->dev, "%s memory method MMAP\n", __func__);
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/* All handling should be done by __videobuf_mmap_mapper() */
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if (!mem->vaddr) {
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dev_err(q->dev, "memory is not allocated/mmapped.\n");
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return -EINVAL;
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}
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break;
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case V4L2_MEMORY_USERPTR:
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dev_dbg(q->dev, "%s memory method USERPTR\n", __func__);
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/* handle pointer from user space */
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if (vb->baddr)
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return videobuf_dma_contig_user_get(mem, vb);
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/* allocate memory for the read() method */
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if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(vb->size)))
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return -ENOMEM;
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break;
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case V4L2_MEMORY_OVERLAY:
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default:
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dev_dbg(q->dev, "%s memory method OVERLAY/unknown\n", __func__);
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return -EINVAL;
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}
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return 0;
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}
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static int __videobuf_mmap_mapper(struct videobuf_queue *q,
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struct videobuf_buffer *buf,
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struct vm_area_struct *vma)
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{
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struct videobuf_dma_contig_memory *mem;
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struct videobuf_mapping *map;
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int retval;
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dev_dbg(q->dev, "%s\n", __func__);
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/* create mapping + update buffer list */
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map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
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if (!map)
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return -ENOMEM;
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buf->map = map;
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map->q = q;
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buf->baddr = vma->vm_start;
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mem = buf->priv;
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BUG_ON(!mem);
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MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
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if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(buf->bsize)))
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goto error;
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/* the "vm_pgoff" is just used in v4l2 to find the
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* corresponding buffer data structure which is allocated
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* earlier and it does not mean the offset from the physical
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* buffer start address as usual. So set it to 0 to pass
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* the sanity check in dma_mmap_coherent().
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*/
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vma->vm_pgoff = 0;
|
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retval = dma_mmap_coherent(q->dev, vma, mem->vaddr, mem->dma_handle,
|
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mem->size);
|
||||
if (retval) {
|
||||
dev_err(q->dev, "mmap: remap failed with error %d. ",
|
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retval);
|
||||
dma_free_coherent(q->dev, mem->size,
|
||||
mem->vaddr, mem->dma_handle);
|
||||
goto error;
|
||||
}
|
||||
|
||||
vma->vm_ops = &videobuf_vm_ops;
|
||||
vm_flags_set(vma, VM_DONTEXPAND);
|
||||
vma->vm_private_data = map;
|
||||
|
||||
dev_dbg(q->dev, "mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
|
||||
map, q, vma->vm_start, vma->vm_end,
|
||||
(long int)buf->bsize, vma->vm_pgoff, buf->i);
|
||||
|
||||
videobuf_vm_open(vma);
|
||||
|
||||
return 0;
|
||||
|
||||
error:
|
||||
kfree(map);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
static struct videobuf_qtype_ops qops = {
|
||||
.magic = MAGIC_QTYPE_OPS,
|
||||
.alloc_vb = __videobuf_alloc,
|
||||
.iolock = __videobuf_iolock,
|
||||
.mmap_mapper = __videobuf_mmap_mapper,
|
||||
.vaddr = __videobuf_to_vaddr,
|
||||
};
|
||||
|
||||
void videobuf_queue_dma_contig_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, &qops, ext_lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_queue_dma_contig_init);
|
||||
|
||||
dma_addr_t videobuf_to_dma_contig(struct videobuf_buffer *buf)
|
||||
{
|
||||
struct videobuf_dma_contig_memory *mem = buf->priv;
|
||||
|
||||
BUG_ON(!mem);
|
||||
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
|
||||
|
||||
return mem->dma_handle;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_to_dma_contig);
|
||||
|
||||
void videobuf_dma_contig_free(struct videobuf_queue *q,
|
||||
struct videobuf_buffer *buf)
|
||||
{
|
||||
struct videobuf_dma_contig_memory *mem = buf->priv;
|
||||
|
||||
/* mmapped memory can't be freed here, otherwise mmapped region
|
||||
would be released, while still needed. In this case, the memory
|
||||
release should happen inside videobuf_vm_close().
|
||||
So, it should free memory only if the memory were allocated for
|
||||
read() operation.
|
||||
*/
|
||||
if (buf->memory != V4L2_MEMORY_USERPTR)
|
||||
return;
|
||||
|
||||
if (!mem)
|
||||
return;
|
||||
|
||||
MAGIC_CHECK(mem->magic, MAGIC_DC_MEM);
|
||||
|
||||
/* handle user space pointer case */
|
||||
if (buf->baddr) {
|
||||
videobuf_dma_contig_user_put(mem);
|
||||
return;
|
||||
}
|
||||
|
||||
/* read() method */
|
||||
if (mem->vaddr) {
|
||||
__videobuf_dc_free(q->dev, mem);
|
||||
mem->vaddr = NULL;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_dma_contig_free);
|
||||
|
||||
MODULE_DESCRIPTION("helper module to manage video4linux dma contig buffers");
|
||||
MODULE_AUTHOR("Magnus Damm");
|
||||
MODULE_LICENSE("GPL");
|
681
drivers/media/v4l2-core/videobuf-dma-sg.c
Normal file
681
drivers/media/v4l2-core/videobuf-dma-sg.c
Normal file
@@ -0,0 +1,681 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/*
|
||||
* helper functions for SG DMA video4linux capture buffers
|
||||
*
|
||||
* The functions expect the hardware being able to scatter gather
|
||||
* (i.e. the buffers are not linear in physical memory, but fragmented
|
||||
* into PAGE_SIZE chunks). They also assume the driver does not need
|
||||
* to touch the video data.
|
||||
*
|
||||
* (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
|
||||
*
|
||||
* Highly based on video-buf written originally by:
|
||||
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
|
||||
* (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org>
|
||||
* (c) 2006 Ted Walther and John Sokol
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/sched/mm.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/pgtable.h>
|
||||
|
||||
#include <linux/dma-mapping.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <asm/page.h>
|
||||
|
||||
#include <media/videobuf-dma-sg.h>
|
||||
|
||||
#define MAGIC_DMABUF 0x19721112
|
||||
#define MAGIC_SG_MEM 0x17890714
|
||||
|
||||
#define MAGIC_CHECK(is, should) \
|
||||
if (unlikely((is) != (should))) { \
|
||||
printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \
|
||||
is, should); \
|
||||
BUG(); \
|
||||
}
|
||||
|
||||
static int debug;
|
||||
module_param(debug, int, 0644);
|
||||
|
||||
MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
|
||||
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
#define dprintk(level, fmt, arg...) \
|
||||
if (debug >= level) \
|
||||
printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
|
||||
/*
|
||||
* Return a scatterlist for some page-aligned vmalloc()'ed memory
|
||||
* block (NULL on errors). Memory for the scatterlist is allocated
|
||||
* using kmalloc. The caller must free the memory.
|
||||
*/
|
||||
static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt,
|
||||
int nr_pages)
|
||||
{
|
||||
struct scatterlist *sglist;
|
||||
struct page *pg;
|
||||
int i;
|
||||
|
||||
sglist = vzalloc(array_size(nr_pages, sizeof(*sglist)));
|
||||
if (NULL == sglist)
|
||||
return NULL;
|
||||
sg_init_table(sglist, nr_pages);
|
||||
for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
|
||||
pg = vmalloc_to_page(virt);
|
||||
if (NULL == pg)
|
||||
goto err;
|
||||
BUG_ON(PageHighMem(pg));
|
||||
sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
|
||||
}
|
||||
return sglist;
|
||||
|
||||
err:
|
||||
vfree(sglist);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Return a scatterlist for a an array of userpages (NULL on errors).
|
||||
* Memory for the scatterlist is allocated using kmalloc. The caller
|
||||
* must free the memory.
|
||||
*/
|
||||
static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
|
||||
int nr_pages, int offset, size_t size)
|
||||
{
|
||||
struct scatterlist *sglist;
|
||||
int i;
|
||||
|
||||
if (NULL == pages[0])
|
||||
return NULL;
|
||||
sglist = vmalloc(array_size(nr_pages, sizeof(*sglist)));
|
||||
if (NULL == sglist)
|
||||
return NULL;
|
||||
sg_init_table(sglist, nr_pages);
|
||||
|
||||
if (PageHighMem(pages[0]))
|
||||
/* DMA to highmem pages might not work */
|
||||
goto highmem;
|
||||
sg_set_page(&sglist[0], pages[0],
|
||||
min_t(size_t, PAGE_SIZE - offset, size), offset);
|
||||
size -= min_t(size_t, PAGE_SIZE - offset, size);
|
||||
for (i = 1; i < nr_pages; i++) {
|
||||
if (NULL == pages[i])
|
||||
goto nopage;
|
||||
if (PageHighMem(pages[i]))
|
||||
goto highmem;
|
||||
sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0);
|
||||
size -= min_t(size_t, PAGE_SIZE, size);
|
||||
}
|
||||
return sglist;
|
||||
|
||||
nopage:
|
||||
dprintk(2, "sgl: oops - no page\n");
|
||||
vfree(sglist);
|
||||
return NULL;
|
||||
|
||||
highmem:
|
||||
dprintk(2, "sgl: oops - highmem page\n");
|
||||
vfree(sglist);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
|
||||
struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf)
|
||||
{
|
||||
struct videobuf_dma_sg_memory *mem = buf->priv;
|
||||
BUG_ON(!mem);
|
||||
|
||||
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
||||
|
||||
return &mem->dma;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_to_dma);
|
||||
|
||||
static void videobuf_dma_init(struct videobuf_dmabuf *dma)
|
||||
{
|
||||
memset(dma, 0, sizeof(*dma));
|
||||
dma->magic = MAGIC_DMABUF;
|
||||
}
|
||||
|
||||
static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
|
||||
int direction, unsigned long data, unsigned long size)
|
||||
{
|
||||
unsigned int gup_flags = FOLL_LONGTERM;
|
||||
unsigned long first, last;
|
||||
int err;
|
||||
|
||||
dma->direction = direction;
|
||||
switch (dma->direction) {
|
||||
case DMA_FROM_DEVICE:
|
||||
gup_flags |= FOLL_WRITE;
|
||||
break;
|
||||
case DMA_TO_DEVICE:
|
||||
break;
|
||||
default:
|
||||
BUG();
|
||||
}
|
||||
|
||||
first = (data & PAGE_MASK) >> PAGE_SHIFT;
|
||||
last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
|
||||
dma->offset = data & ~PAGE_MASK;
|
||||
dma->size = size;
|
||||
dma->nr_pages = last-first+1;
|
||||
dma->pages = kmalloc_array(dma->nr_pages, sizeof(struct page *),
|
||||
GFP_KERNEL);
|
||||
if (NULL == dma->pages)
|
||||
return -ENOMEM;
|
||||
|
||||
dprintk(1, "init user [0x%lx+0x%lx => %lu pages]\n",
|
||||
data, size, dma->nr_pages);
|
||||
|
||||
err = pin_user_pages(data & PAGE_MASK, dma->nr_pages, gup_flags,
|
||||
dma->pages);
|
||||
|
||||
if (err != dma->nr_pages) {
|
||||
dma->nr_pages = (err >= 0) ? err : 0;
|
||||
dprintk(1, "pin_user_pages: err=%d [%lu]\n", err,
|
||||
dma->nr_pages);
|
||||
return err < 0 ? err : -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
|
||||
unsigned long data, unsigned long size)
|
||||
{
|
||||
int ret;
|
||||
|
||||
mmap_read_lock(current->mm);
|
||||
ret = videobuf_dma_init_user_locked(dma, direction, data, size);
|
||||
mmap_read_unlock(current->mm);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
|
||||
unsigned long nr_pages)
|
||||
{
|
||||
int i;
|
||||
|
||||
dprintk(1, "init kernel [%lu pages]\n", nr_pages);
|
||||
|
||||
dma->direction = direction;
|
||||
dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages),
|
||||
GFP_KERNEL);
|
||||
if (!dma->vaddr_pages)
|
||||
return -ENOMEM;
|
||||
|
||||
dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL);
|
||||
if (!dma->dma_addr) {
|
||||
kfree(dma->vaddr_pages);
|
||||
return -ENOMEM;
|
||||
}
|
||||
for (i = 0; i < nr_pages; i++) {
|
||||
void *addr;
|
||||
|
||||
addr = dma_alloc_coherent(dma->dev, PAGE_SIZE,
|
||||
&(dma->dma_addr[i]), GFP_KERNEL);
|
||||
if (addr == NULL)
|
||||
goto out_free_pages;
|
||||
|
||||
dma->vaddr_pages[i] = virt_to_page(addr);
|
||||
}
|
||||
dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP,
|
||||
PAGE_KERNEL);
|
||||
if (NULL == dma->vaddr) {
|
||||
dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
|
||||
goto out_free_pages;
|
||||
}
|
||||
|
||||
dprintk(1, "vmalloc is at addr %p, size=%lu\n",
|
||||
dma->vaddr, nr_pages << PAGE_SHIFT);
|
||||
|
||||
memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
|
||||
dma->nr_pages = nr_pages;
|
||||
|
||||
return 0;
|
||||
out_free_pages:
|
||||
while (i > 0) {
|
||||
void *addr;
|
||||
|
||||
i--;
|
||||
addr = page_address(dma->vaddr_pages[i]);
|
||||
dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]);
|
||||
}
|
||||
kfree(dma->dma_addr);
|
||||
dma->dma_addr = NULL;
|
||||
kfree(dma->vaddr_pages);
|
||||
dma->vaddr_pages = NULL;
|
||||
|
||||
return -ENOMEM;
|
||||
|
||||
}
|
||||
|
||||
static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
|
||||
dma_addr_t addr, unsigned long nr_pages)
|
||||
{
|
||||
dprintk(1, "init overlay [%lu pages @ bus 0x%lx]\n",
|
||||
nr_pages, (unsigned long)addr);
|
||||
dma->direction = direction;
|
||||
|
||||
if (0 == addr)
|
||||
return -EINVAL;
|
||||
|
||||
dma->bus_addr = addr;
|
||||
dma->nr_pages = nr_pages;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
|
||||
{
|
||||
MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
|
||||
BUG_ON(0 == dma->nr_pages);
|
||||
|
||||
if (dma->pages) {
|
||||
dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
|
||||
dma->offset, dma->size);
|
||||
}
|
||||
if (dma->vaddr) {
|
||||
dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr,
|
||||
dma->nr_pages);
|
||||
}
|
||||
if (dma->bus_addr) {
|
||||
dma->sglist = vmalloc(sizeof(*dma->sglist));
|
||||
if (NULL != dma->sglist) {
|
||||
dma->sglen = 1;
|
||||
sg_dma_address(&dma->sglist[0]) = dma->bus_addr
|
||||
& PAGE_MASK;
|
||||
dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
|
||||
sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
if (NULL == dma->sglist) {
|
||||
dprintk(1, "scatterlist is NULL\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
if (!dma->bus_addr) {
|
||||
dma->sglen = dma_map_sg(dev, dma->sglist,
|
||||
dma->nr_pages, dma->direction);
|
||||
if (0 == dma->sglen) {
|
||||
printk(KERN_WARNING
|
||||
"%s: videobuf_map_sg failed\n", __func__);
|
||||
vfree(dma->sglist);
|
||||
dma->sglist = NULL;
|
||||
dma->sglen = 0;
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
|
||||
{
|
||||
MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
|
||||
|
||||
if (!dma->sglen)
|
||||
return 0;
|
||||
|
||||
dma_unmap_sg(dev, dma->sglist, dma->nr_pages, dma->direction);
|
||||
|
||||
vfree(dma->sglist);
|
||||
dma->sglist = NULL;
|
||||
dma->sglen = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
|
||||
|
||||
int videobuf_dma_free(struct videobuf_dmabuf *dma)
|
||||
{
|
||||
int i;
|
||||
MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
|
||||
BUG_ON(dma->sglen);
|
||||
|
||||
if (dma->pages) {
|
||||
unpin_user_pages_dirty_lock(dma->pages, dma->nr_pages,
|
||||
dma->direction == DMA_FROM_DEVICE);
|
||||
kfree(dma->pages);
|
||||
dma->pages = NULL;
|
||||
}
|
||||
|
||||
if (dma->dma_addr) {
|
||||
for (i = 0; i < dma->nr_pages; i++) {
|
||||
void *addr;
|
||||
|
||||
addr = page_address(dma->vaddr_pages[i]);
|
||||
dma_free_coherent(dma->dev, PAGE_SIZE, addr,
|
||||
dma->dma_addr[i]);
|
||||
}
|
||||
kfree(dma->dma_addr);
|
||||
dma->dma_addr = NULL;
|
||||
kfree(dma->vaddr_pages);
|
||||
dma->vaddr_pages = NULL;
|
||||
vunmap(dma->vaddr);
|
||||
dma->vaddr = NULL;
|
||||
}
|
||||
|
||||
if (dma->bus_addr)
|
||||
dma->bus_addr = 0;
|
||||
dma->direction = DMA_NONE;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_dma_free);
|
||||
|
||||
/* --------------------------------------------------------------------- */
|
||||
|
||||
static void videobuf_vm_open(struct vm_area_struct *vma)
|
||||
{
|
||||
struct videobuf_mapping *map = vma->vm_private_data;
|
||||
|
||||
dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map,
|
||||
map->count, vma->vm_start, vma->vm_end);
|
||||
|
||||
map->count++;
|
||||
}
|
||||
|
||||
static void videobuf_vm_close(struct vm_area_struct *vma)
|
||||
{
|
||||
struct videobuf_mapping *map = vma->vm_private_data;
|
||||
struct videobuf_queue *q = map->q;
|
||||
struct videobuf_dma_sg_memory *mem;
|
||||
int i;
|
||||
|
||||
dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map,
|
||||
map->count, vma->vm_start, vma->vm_end);
|
||||
|
||||
map->count--;
|
||||
if (0 == map->count) {
|
||||
dprintk(1, "munmap %p q=%p\n", map, q);
|
||||
videobuf_queue_lock(q);
|
||||
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
|
||||
if (NULL == q->bufs[i])
|
||||
continue;
|
||||
mem = q->bufs[i]->priv;
|
||||
if (!mem)
|
||||
continue;
|
||||
|
||||
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
||||
|
||||
if (q->bufs[i]->map != map)
|
||||
continue;
|
||||
q->bufs[i]->map = NULL;
|
||||
q->bufs[i]->baddr = 0;
|
||||
q->ops->buf_release(q, q->bufs[i]);
|
||||
}
|
||||
videobuf_queue_unlock(q);
|
||||
kfree(map);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Get a anonymous page for the mapping. Make sure we can DMA to that
|
||||
* memory location with 32bit PCI devices (i.e. don't use highmem for
|
||||
* now ...). Bounce buffers don't work very well for the data rates
|
||||
* video capture has.
|
||||
*/
|
||||
static vm_fault_t videobuf_vm_fault(struct vm_fault *vmf)
|
||||
{
|
||||
struct vm_area_struct *vma = vmf->vma;
|
||||
struct page *page;
|
||||
|
||||
dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n",
|
||||
vmf->address, vma->vm_start, vma->vm_end);
|
||||
|
||||
page = alloc_page(GFP_USER | __GFP_DMA32);
|
||||
if (!page)
|
||||
return VM_FAULT_OOM;
|
||||
clear_user_highpage(page, vmf->address);
|
||||
vmf->page = page;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct vm_operations_struct videobuf_vm_ops = {
|
||||
.open = videobuf_vm_open,
|
||||
.close = videobuf_vm_close,
|
||||
.fault = videobuf_vm_fault,
|
||||
};
|
||||
|
||||
/* ---------------------------------------------------------------------
|
||||
* SG handlers for the generic methods
|
||||
*/
|
||||
|
||||
/* Allocated area consists on 3 parts:
|
||||
struct video_buffer
|
||||
struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
|
||||
struct videobuf_dma_sg_memory
|
||||
*/
|
||||
|
||||
static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
|
||||
{
|
||||
struct videobuf_dma_sg_memory *mem;
|
||||
struct videobuf_buffer *vb;
|
||||
|
||||
vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
|
||||
if (!vb)
|
||||
return vb;
|
||||
|
||||
mem = vb->priv = ((char *)vb) + size;
|
||||
mem->magic = MAGIC_SG_MEM;
|
||||
|
||||
videobuf_dma_init(&mem->dma);
|
||||
|
||||
dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
|
||||
__func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb),
|
||||
mem, (long)sizeof(*mem));
|
||||
|
||||
return vb;
|
||||
}
|
||||
|
||||
static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
|
||||
{
|
||||
struct videobuf_dma_sg_memory *mem = buf->priv;
|
||||
BUG_ON(!mem);
|
||||
|
||||
MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
|
||||
|
||||
return mem->dma.vaddr;
|
||||
}
|
||||
|
||||
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);
|
||||
|
326
drivers/media/v4l2-core/videobuf-vmalloc.c
Normal file
326
drivers/media/v4l2-core/videobuf-vmalloc.c
Normal file
@@ -0,0 +1,326 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-only
|
||||
/*
|
||||
* helper functions for vmalloc video4linux capture buffers
|
||||
*
|
||||
* The functions expect the hardware being able to scatter gather
|
||||
* (i.e. the buffers are not linear in physical memory, but fragmented
|
||||
* into PAGE_SIZE chunks). They also assume the driver does not need
|
||||
* to touch the video data.
|
||||
*
|
||||
* (c) 2007 Mauro Carvalho Chehab <mchehab@kernel.org>
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/pgtable.h>
|
||||
|
||||
#include <linux/pci.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <asm/page.h>
|
||||
|
||||
#include <media/videobuf-vmalloc.h>
|
||||
|
||||
#define MAGIC_DMABUF 0x17760309
|
||||
#define MAGIC_VMAL_MEM 0x18221223
|
||||
|
||||
#define MAGIC_CHECK(is, should) \
|
||||
if (unlikely((is) != (should))) { \
|
||||
printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \
|
||||
is, should); \
|
||||
BUG(); \
|
||||
}
|
||||
|
||||
static int debug;
|
||||
module_param(debug, int, 0644);
|
||||
|
||||
MODULE_DESCRIPTION("helper module to manage video4linux vmalloc buffers");
|
||||
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
#define dprintk(level, fmt, arg...) \
|
||||
if (debug >= level) \
|
||||
printk(KERN_DEBUG "vbuf-vmalloc: " fmt , ## arg)
|
||||
|
||||
|
||||
/***************************************************************************/
|
||||
|
||||
static void videobuf_vm_open(struct vm_area_struct *vma)
|
||||
{
|
||||
struct videobuf_mapping *map = vma->vm_private_data;
|
||||
|
||||
dprintk(2, "vm_open %p [count=%u,vma=%08lx-%08lx]\n", map,
|
||||
map->count, vma->vm_start, vma->vm_end);
|
||||
|
||||
map->count++;
|
||||
}
|
||||
|
||||
static void videobuf_vm_close(struct vm_area_struct *vma)
|
||||
{
|
||||
struct videobuf_mapping *map = vma->vm_private_data;
|
||||
struct videobuf_queue *q = map->q;
|
||||
int i;
|
||||
|
||||
dprintk(2, "vm_close %p [count=%u,vma=%08lx-%08lx]\n", map,
|
||||
map->count, vma->vm_start, vma->vm_end);
|
||||
|
||||
map->count--;
|
||||
if (0 == map->count) {
|
||||
struct videobuf_vmalloc_memory *mem;
|
||||
|
||||
dprintk(1, "munmap %p q=%p\n", map, q);
|
||||
videobuf_queue_lock(q);
|
||||
|
||||
/* We need first to cancel streams, before unmapping */
|
||||
if (q->streaming)
|
||||
videobuf_queue_cancel(q);
|
||||
|
||||
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
|
||||
if (NULL == q->bufs[i])
|
||||
continue;
|
||||
|
||||
if (q->bufs[i]->map != map)
|
||||
continue;
|
||||
|
||||
mem = q->bufs[i]->priv;
|
||||
if (mem) {
|
||||
/* This callback is called only if kernel has
|
||||
allocated memory and this memory is mmapped.
|
||||
In this case, memory should be freed,
|
||||
in order to do memory unmap.
|
||||
*/
|
||||
|
||||
MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
|
||||
|
||||
/* vfree is not atomic - can't be
|
||||
called with IRQ's disabled
|
||||
*/
|
||||
dprintk(1, "%s: buf[%d] freeing (%p)\n",
|
||||
__func__, i, mem->vaddr);
|
||||
|
||||
vfree(mem->vaddr);
|
||||
mem->vaddr = NULL;
|
||||
}
|
||||
|
||||
q->bufs[i]->map = NULL;
|
||||
q->bufs[i]->baddr = 0;
|
||||
}
|
||||
|
||||
kfree(map);
|
||||
|
||||
videobuf_queue_unlock(q);
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
static const struct vm_operations_struct videobuf_vm_ops = {
|
||||
.open = videobuf_vm_open,
|
||||
.close = videobuf_vm_close,
|
||||
};
|
||||
|
||||
/* ---------------------------------------------------------------------
|
||||
* vmalloc handlers for the generic methods
|
||||
*/
|
||||
|
||||
/* Allocated area consists on 3 parts:
|
||||
struct video_buffer
|
||||
struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
|
||||
struct videobuf_dma_sg_memory
|
||||
*/
|
||||
|
||||
static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
|
||||
{
|
||||
struct videobuf_vmalloc_memory *mem;
|
||||
struct videobuf_buffer *vb;
|
||||
|
||||
vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
|
||||
if (!vb)
|
||||
return vb;
|
||||
|
||||
mem = vb->priv = ((char *)vb) + size;
|
||||
mem->magic = MAGIC_VMAL_MEM;
|
||||
|
||||
dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
|
||||
__func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb),
|
||||
mem, (long)sizeof(*mem));
|
||||
|
||||
return vb;
|
||||
}
|
||||
|
||||
static int __videobuf_iolock(struct videobuf_queue *q,
|
||||
struct videobuf_buffer *vb,
|
||||
struct v4l2_framebuffer *fbuf)
|
||||
{
|
||||
struct videobuf_vmalloc_memory *mem = vb->priv;
|
||||
int pages;
|
||||
|
||||
BUG_ON(!mem);
|
||||
|
||||
MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
|
||||
|
||||
switch (vb->memory) {
|
||||
case V4L2_MEMORY_MMAP:
|
||||
dprintk(1, "%s memory method MMAP\n", __func__);
|
||||
|
||||
/* All handling should be done by __videobuf_mmap_mapper() */
|
||||
if (!mem->vaddr) {
|
||||
printk(KERN_ERR "memory is not allocated/mmapped.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
break;
|
||||
case V4L2_MEMORY_USERPTR:
|
||||
pages = PAGE_ALIGN(vb->size);
|
||||
|
||||
dprintk(1, "%s memory method USERPTR\n", __func__);
|
||||
|
||||
if (vb->baddr) {
|
||||
printk(KERN_ERR "USERPTR is currently not supported\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* The only USERPTR currently supported is the one needed for
|
||||
* read() method.
|
||||
*/
|
||||
|
||||
mem->vaddr = vmalloc_user(pages);
|
||||
if (!mem->vaddr) {
|
||||
printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
|
||||
return -ENOMEM;
|
||||
}
|
||||
dprintk(1, "vmalloc is at addr %p (%d pages)\n",
|
||||
mem->vaddr, pages);
|
||||
break;
|
||||
case V4L2_MEMORY_OVERLAY:
|
||||
default:
|
||||
dprintk(1, "%s memory method OVERLAY/unknown\n", __func__);
|
||||
|
||||
/* Currently, doesn't support V4L2_MEMORY_OVERLAY */
|
||||
printk(KERN_ERR "Memory method currently unsupported.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __videobuf_mmap_mapper(struct videobuf_queue *q,
|
||||
struct videobuf_buffer *buf,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
struct videobuf_vmalloc_memory *mem;
|
||||
struct videobuf_mapping *map;
|
||||
int retval, pages;
|
||||
|
||||
dprintk(1, "%s\n", __func__);
|
||||
|
||||
/* create mapping + update buffer list */
|
||||
map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
|
||||
if (NULL == map)
|
||||
return -ENOMEM;
|
||||
|
||||
buf->map = map;
|
||||
map->q = q;
|
||||
|
||||
buf->baddr = vma->vm_start;
|
||||
|
||||
mem = buf->priv;
|
||||
BUG_ON(!mem);
|
||||
MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
|
||||
|
||||
pages = PAGE_ALIGN(vma->vm_end - vma->vm_start);
|
||||
mem->vaddr = vmalloc_user(pages);
|
||||
if (!mem->vaddr) {
|
||||
printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
|
||||
goto error;
|
||||
}
|
||||
dprintk(1, "vmalloc is at addr %p (%d pages)\n", mem->vaddr, pages);
|
||||
|
||||
/* Try to remap memory */
|
||||
retval = remap_vmalloc_range(vma, mem->vaddr, 0);
|
||||
if (retval < 0) {
|
||||
printk(KERN_ERR "mmap: remap failed with error %d. ", retval);
|
||||
vfree(mem->vaddr);
|
||||
goto error;
|
||||
}
|
||||
|
||||
vma->vm_ops = &videobuf_vm_ops;
|
||||
vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP);
|
||||
vma->vm_private_data = map;
|
||||
|
||||
dprintk(1, "mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
|
||||
map, q, vma->vm_start, vma->vm_end,
|
||||
(long int)buf->bsize,
|
||||
vma->vm_pgoff, buf->i);
|
||||
|
||||
videobuf_vm_open(vma);
|
||||
|
||||
return 0;
|
||||
|
||||
error:
|
||||
mem = NULL;
|
||||
kfree(map);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
static struct videobuf_qtype_ops qops = {
|
||||
.magic = MAGIC_QTYPE_OPS,
|
||||
|
||||
.alloc_vb = __videobuf_alloc_vb,
|
||||
.iolock = __videobuf_iolock,
|
||||
.mmap_mapper = __videobuf_mmap_mapper,
|
||||
.vaddr = videobuf_to_vmalloc,
|
||||
};
|
||||
|
||||
void videobuf_queue_vmalloc_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, &qops, ext_lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init);
|
||||
|
||||
void *videobuf_to_vmalloc(struct videobuf_buffer *buf)
|
||||
{
|
||||
struct videobuf_vmalloc_memory *mem = buf->priv;
|
||||
BUG_ON(!mem);
|
||||
MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
|
||||
|
||||
return mem->vaddr;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_to_vmalloc);
|
||||
|
||||
void videobuf_vmalloc_free(struct videobuf_buffer *buf)
|
||||
{
|
||||
struct videobuf_vmalloc_memory *mem = buf->priv;
|
||||
|
||||
/* mmapped memory can't be freed here, otherwise mmapped region
|
||||
would be released, while still needed. In this case, the memory
|
||||
release should happen inside videobuf_vm_close().
|
||||
So, it should free memory only if the memory were allocated for
|
||||
read() operation.
|
||||
*/
|
||||
if ((buf->memory != V4L2_MEMORY_USERPTR) || buf->baddr)
|
||||
return;
|
||||
|
||||
if (!mem)
|
||||
return;
|
||||
|
||||
MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
|
||||
|
||||
vfree(mem->vaddr);
|
||||
mem->vaddr = NULL;
|
||||
|
||||
return;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(videobuf_vmalloc_free);
|
||||
|
Reference in New Issue
Block a user