453 lines
10 KiB
C
453 lines
10 KiB
C
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/*
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* videobuf2-vmalloc.c - vmalloc memory allocator for videobuf2
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Pawel Osciak <pawel@osciak.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/refcount.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <media/videobuf2-v4l2.h>
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#include <media/videobuf2-vmalloc.h>
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#include <media/videobuf2-memops.h>
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struct vb2_vmalloc_buf {
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void *vaddr;
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struct frame_vector *vec;
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enum dma_data_direction dma_dir;
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unsigned long size;
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refcount_t refcount;
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struct vb2_vmarea_handler handler;
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struct dma_buf *dbuf;
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};
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static void vb2_vmalloc_put(void *buf_priv);
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static void *vb2_vmalloc_alloc(struct device *dev, unsigned long attrs,
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unsigned long size, enum dma_data_direction dma_dir,
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gfp_t gfp_flags)
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{
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struct vb2_vmalloc_buf *buf;
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buf = kzalloc(sizeof(*buf), GFP_KERNEL | gfp_flags);
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if (!buf)
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return ERR_PTR(-ENOMEM);
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buf->size = size;
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buf->vaddr = vmalloc_user(buf->size);
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buf->dma_dir = dma_dir;
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buf->handler.refcount = &buf->refcount;
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buf->handler.put = vb2_vmalloc_put;
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buf->handler.arg = buf;
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if (!buf->vaddr) {
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pr_debug("vmalloc of size %ld failed\n", buf->size);
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kfree(buf);
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return ERR_PTR(-ENOMEM);
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}
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refcount_set(&buf->refcount, 1);
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return buf;
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}
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static void vb2_vmalloc_put(void *buf_priv)
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{
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struct vb2_vmalloc_buf *buf = buf_priv;
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if (refcount_dec_and_test(&buf->refcount)) {
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vfree(buf->vaddr);
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kfree(buf);
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}
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}
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static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr,
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unsigned long size,
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enum dma_data_direction dma_dir)
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{
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struct vb2_vmalloc_buf *buf;
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struct frame_vector *vec;
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int n_pages, offset, i;
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int ret = -ENOMEM;
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buf = kzalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf)
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return ERR_PTR(-ENOMEM);
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buf->dma_dir = dma_dir;
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offset = vaddr & ~PAGE_MASK;
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buf->size = size;
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vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE ||
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dma_dir == DMA_BIDIRECTIONAL);
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if (IS_ERR(vec)) {
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ret = PTR_ERR(vec);
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goto fail_pfnvec_create;
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}
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buf->vec = vec;
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n_pages = frame_vector_count(vec);
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if (frame_vector_to_pages(vec) < 0) {
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unsigned long *nums = frame_vector_pfns(vec);
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/*
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* We cannot get page pointers for these pfns. Check memory is
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* physically contiguous and use direct mapping.
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*/
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for (i = 1; i < n_pages; i++)
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if (nums[i-1] + 1 != nums[i])
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goto fail_map;
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buf->vaddr = (__force void *)
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ioremap_nocache(nums[0] << PAGE_SHIFT, size);
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} else {
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buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1,
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PAGE_KERNEL);
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}
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if (!buf->vaddr)
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goto fail_map;
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buf->vaddr += offset;
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return buf;
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fail_map:
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vb2_destroy_framevec(vec);
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fail_pfnvec_create:
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kfree(buf);
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return ERR_PTR(ret);
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}
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static void vb2_vmalloc_put_userptr(void *buf_priv)
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{
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struct vb2_vmalloc_buf *buf = buf_priv;
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unsigned long vaddr = (unsigned long)buf->vaddr & PAGE_MASK;
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unsigned int i;
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struct page **pages;
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unsigned int n_pages;
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if (!buf->vec->is_pfns) {
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n_pages = frame_vector_count(buf->vec);
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pages = frame_vector_pages(buf->vec);
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if (vaddr)
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vm_unmap_ram((void *)vaddr, n_pages);
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if (buf->dma_dir == DMA_FROM_DEVICE ||
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buf->dma_dir == DMA_BIDIRECTIONAL)
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for (i = 0; i < n_pages; i++)
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set_page_dirty_lock(pages[i]);
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} else {
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iounmap((__force void __iomem *)buf->vaddr);
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}
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vb2_destroy_framevec(buf->vec);
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kfree(buf);
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}
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static void *vb2_vmalloc_vaddr(void *buf_priv)
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{
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struct vb2_vmalloc_buf *buf = buf_priv;
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if (!buf->vaddr) {
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pr_err("Address of an unallocated plane requested or cannot map user pointer\n");
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return NULL;
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}
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return buf->vaddr;
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}
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static unsigned int vb2_vmalloc_num_users(void *buf_priv)
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{
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struct vb2_vmalloc_buf *buf = buf_priv;
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return refcount_read(&buf->refcount);
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}
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static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma)
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{
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struct vb2_vmalloc_buf *buf = buf_priv;
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int ret;
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if (!buf) {
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pr_err("No memory to map\n");
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return -EINVAL;
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}
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ret = remap_vmalloc_range(vma, buf->vaddr, 0);
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if (ret) {
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pr_err("Remapping vmalloc memory, error: %d\n", ret);
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return ret;
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}
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/*
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* Make sure that vm_areas for 2 buffers won't be merged together
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*/
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vma->vm_flags |= VM_DONTEXPAND;
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/*
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* Use common vm_area operations to track buffer refcount.
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*/
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vma->vm_private_data = &buf->handler;
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vma->vm_ops = &vb2_common_vm_ops;
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vma->vm_ops->open(vma);
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return 0;
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}
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#ifdef CONFIG_HAS_DMA
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/*********************************************/
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/* DMABUF ops for exporters */
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/*********************************************/
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struct vb2_vmalloc_attachment {
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struct sg_table sgt;
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enum dma_data_direction dma_dir;
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};
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static int vb2_vmalloc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev,
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struct dma_buf_attachment *dbuf_attach)
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{
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struct vb2_vmalloc_attachment *attach;
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struct vb2_vmalloc_buf *buf = dbuf->priv;
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int num_pages = PAGE_ALIGN(buf->size) / PAGE_SIZE;
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struct sg_table *sgt;
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struct scatterlist *sg;
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void *vaddr = buf->vaddr;
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int ret;
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int i;
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attach = kzalloc(sizeof(*attach), GFP_KERNEL);
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if (!attach)
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return -ENOMEM;
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sgt = &attach->sgt;
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ret = sg_alloc_table(sgt, num_pages, GFP_KERNEL);
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if (ret) {
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kfree(attach);
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return ret;
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}
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for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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struct page *page = vmalloc_to_page(vaddr);
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if (!page) {
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sg_free_table(sgt);
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kfree(attach);
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return -ENOMEM;
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}
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sg_set_page(sg, page, PAGE_SIZE, 0);
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vaddr += PAGE_SIZE;
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}
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attach->dma_dir = DMA_NONE;
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dbuf_attach->priv = attach;
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return 0;
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}
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static void vb2_vmalloc_dmabuf_ops_detach(struct dma_buf *dbuf,
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struct dma_buf_attachment *db_attach)
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{
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struct vb2_vmalloc_attachment *attach = db_attach->priv;
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struct sg_table *sgt;
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if (!attach)
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return;
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sgt = &attach->sgt;
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/* release the scatterlist cache */
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if (attach->dma_dir != DMA_NONE)
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dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
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attach->dma_dir);
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sg_free_table(sgt);
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kfree(attach);
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db_attach->priv = NULL;
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}
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static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
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struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
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{
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struct vb2_vmalloc_attachment *attach = db_attach->priv;
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/* stealing dmabuf mutex to serialize map/unmap operations */
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struct mutex *lock = &db_attach->dmabuf->lock;
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struct sg_table *sgt;
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mutex_lock(lock);
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sgt = &attach->sgt;
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/* return previously mapped sg table */
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if (attach->dma_dir == dma_dir) {
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mutex_unlock(lock);
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return sgt;
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}
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/* release any previous cache */
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if (attach->dma_dir != DMA_NONE) {
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dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
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attach->dma_dir);
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attach->dma_dir = DMA_NONE;
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}
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/* mapping to the client with new direction */
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sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
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dma_dir);
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if (!sgt->nents) {
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pr_err("failed to map scatterlist\n");
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mutex_unlock(lock);
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return ERR_PTR(-EIO);
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}
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attach->dma_dir = dma_dir;
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mutex_unlock(lock);
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return sgt;
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}
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static void vb2_vmalloc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach,
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struct sg_table *sgt, enum dma_data_direction dma_dir)
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{
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/* nothing to be done here */
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}
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static void vb2_vmalloc_dmabuf_ops_release(struct dma_buf *dbuf)
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{
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/* drop reference obtained in vb2_vmalloc_get_dmabuf */
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vb2_vmalloc_put(dbuf->priv);
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}
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static void *vb2_vmalloc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum)
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{
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struct vb2_vmalloc_buf *buf = dbuf->priv;
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return buf->vaddr + pgnum * PAGE_SIZE;
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}
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static void *vb2_vmalloc_dmabuf_ops_vmap(struct dma_buf *dbuf)
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{
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struct vb2_vmalloc_buf *buf = dbuf->priv;
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return buf->vaddr;
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}
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static int vb2_vmalloc_dmabuf_ops_mmap(struct dma_buf *dbuf,
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struct vm_area_struct *vma)
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{
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return vb2_vmalloc_mmap(dbuf->priv, vma);
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}
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static const struct dma_buf_ops vb2_vmalloc_dmabuf_ops = {
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.attach = vb2_vmalloc_dmabuf_ops_attach,
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.detach = vb2_vmalloc_dmabuf_ops_detach,
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.map_dma_buf = vb2_vmalloc_dmabuf_ops_map,
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.unmap_dma_buf = vb2_vmalloc_dmabuf_ops_unmap,
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.map = vb2_vmalloc_dmabuf_ops_kmap,
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.map_atomic = vb2_vmalloc_dmabuf_ops_kmap,
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.vmap = vb2_vmalloc_dmabuf_ops_vmap,
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.mmap = vb2_vmalloc_dmabuf_ops_mmap,
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.release = vb2_vmalloc_dmabuf_ops_release,
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};
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static struct dma_buf *vb2_vmalloc_get_dmabuf(void *buf_priv, unsigned long flags)
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{
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struct vb2_vmalloc_buf *buf = buf_priv;
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struct dma_buf *dbuf;
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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exp_info.ops = &vb2_vmalloc_dmabuf_ops;
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exp_info.size = buf->size;
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exp_info.flags = flags;
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exp_info.priv = buf;
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if (WARN_ON(!buf->vaddr))
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return NULL;
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dbuf = dma_buf_export(&exp_info);
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if (IS_ERR(dbuf))
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return NULL;
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/* dmabuf keeps reference to vb2 buffer */
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refcount_inc(&buf->refcount);
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||
|
|
return dbuf;
|
||
|
|
}
|
||
|
|
#endif /* CONFIG_HAS_DMA */
|
||
|
|
|
||
|
|
|
||
|
|
/*********************************************/
|
||
|
|
/* callbacks for DMABUF buffers */
|
||
|
|
/*********************************************/
|
||
|
|
|
||
|
|
static int vb2_vmalloc_map_dmabuf(void *mem_priv)
|
||
|
|
{
|
||
|
|
struct vb2_vmalloc_buf *buf = mem_priv;
|
||
|
|
|
||
|
|
buf->vaddr = dma_buf_vmap(buf->dbuf);
|
||
|
|
|
||
|
|
return buf->vaddr ? 0 : -EFAULT;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void vb2_vmalloc_unmap_dmabuf(void *mem_priv)
|
||
|
|
{
|
||
|
|
struct vb2_vmalloc_buf *buf = mem_priv;
|
||
|
|
|
||
|
|
dma_buf_vunmap(buf->dbuf, buf->vaddr);
|
||
|
|
buf->vaddr = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void vb2_vmalloc_detach_dmabuf(void *mem_priv)
|
||
|
|
{
|
||
|
|
struct vb2_vmalloc_buf *buf = mem_priv;
|
||
|
|
|
||
|
|
if (buf->vaddr)
|
||
|
|
dma_buf_vunmap(buf->dbuf, buf->vaddr);
|
||
|
|
|
||
|
|
kfree(buf);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void *vb2_vmalloc_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
|
||
|
|
unsigned long size, enum dma_data_direction dma_dir)
|
||
|
|
{
|
||
|
|
struct vb2_vmalloc_buf *buf;
|
||
|
|
|
||
|
|
if (dbuf->size < size)
|
||
|
|
return ERR_PTR(-EFAULT);
|
||
|
|
|
||
|
|
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
|
||
|
|
if (!buf)
|
||
|
|
return ERR_PTR(-ENOMEM);
|
||
|
|
|
||
|
|
buf->dbuf = dbuf;
|
||
|
|
buf->dma_dir = dma_dir;
|
||
|
|
buf->size = size;
|
||
|
|
|
||
|
|
return buf;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
const struct vb2_mem_ops vb2_vmalloc_memops = {
|
||
|
|
.alloc = vb2_vmalloc_alloc,
|
||
|
|
.put = vb2_vmalloc_put,
|
||
|
|
.get_userptr = vb2_vmalloc_get_userptr,
|
||
|
|
.put_userptr = vb2_vmalloc_put_userptr,
|
||
|
|
#ifdef CONFIG_HAS_DMA
|
||
|
|
.get_dmabuf = vb2_vmalloc_get_dmabuf,
|
||
|
|
#endif
|
||
|
|
.map_dmabuf = vb2_vmalloc_map_dmabuf,
|
||
|
|
.unmap_dmabuf = vb2_vmalloc_unmap_dmabuf,
|
||
|
|
.attach_dmabuf = vb2_vmalloc_attach_dmabuf,
|
||
|
|
.detach_dmabuf = vb2_vmalloc_detach_dmabuf,
|
||
|
|
.vaddr = vb2_vmalloc_vaddr,
|
||
|
|
.mmap = vb2_vmalloc_mmap,
|
||
|
|
.num_users = vb2_vmalloc_num_users,
|
||
|
|
};
|
||
|
|
EXPORT_SYMBOL_GPL(vb2_vmalloc_memops);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("vmalloc memory handling routines for videobuf2");
|
||
|
|
MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>");
|
||
|
|
MODULE_LICENSE("GPL");
|