+++ /dev/null
-/*
- * Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/dma-mapping.h>
-#include <linux/nvmap.h>
-
-#include <media/videobuf2-core.h>
-#include <media/videobuf2-memops.h>
-
-struct vb2_dc_conf {
- struct device *dev;
- struct nvmap_client *nvmap_client;
-};
-
-struct vb2_dc_buf {
- struct vb2_dc_conf *conf;
- void *vaddr;
- phys_addr_t paddr;
- unsigned long size;
- struct vm_area_struct *vma;
- atomic_t refcount;
- struct vb2_vmarea_handler handler;
-
- struct nvmap_handle_ref *nvmap_ref;
-};
-
-static void vb2_dma_nvmap_put(void *buf_priv);
-
-static void *vb2_dma_nvmap_alloc(void *alloc_ctx, unsigned long size)
-{
- struct vb2_dc_conf *conf = alloc_ctx;
- struct vb2_dc_buf *buf;
- int ret;
-
- buf = kzalloc(sizeof(*buf), GFP_KERNEL);
- if (!buf) {
- ret = -ENOMEM;
- goto exit;
- }
-
- buf->nvmap_ref = nvmap_alloc(conf->nvmap_client, size, 32,
- NVMAP_HANDLE_UNCACHEABLE, 0);
- if (IS_ERR(buf->nvmap_ref)) {
- dev_err(conf->dev, "nvmap_alloc failed\n");
- ret = -ENOMEM;
- goto exit_free;
- }
-
- ret = nvmap_pin(conf->nvmap_client, buf->nvmap_ref, &buf->paddr);
- if (ret) {
- dev_err(conf->dev, "nvmap_pin failed\n");
- ret = -ENOMEM;
- goto exit_dealloc;
- }
-
- buf->vaddr = nvmap_mmap(buf->nvmap_ref);
- if (!buf->vaddr) {
- dev_err(conf->dev, "nvmap_mmap failed\n");
- ret = -ENOMEM;
- goto exit_unpin;
- }
-
- buf->conf = conf;
- buf->size = size;
-
- buf->handler.refcount = &buf->refcount;
- buf->handler.put = vb2_dma_nvmap_put;
- buf->handler.arg = buf;
-
- atomic_inc(&buf->refcount);
-
- return buf;
-
-exit_unpin:
- nvmap_unpin(conf->nvmap_client, buf->nvmap_ref);
-exit_dealloc:
- nvmap_free(conf->nvmap_client, buf->nvmap_ref);
-exit_free:
- kfree(buf);
-exit:
- return ERR_PTR(ret);
-}
-
-static void vb2_dma_nvmap_put(void *buf_priv)
-{
- struct vb2_dc_buf *buf = buf_priv;
-
- if (atomic_dec_and_test(&buf->refcount)) {
- nvmap_munmap(buf->nvmap_ref, buf->vaddr);
- nvmap_unpin(buf->conf->nvmap_client, buf->nvmap_ref);
- nvmap_free(buf->conf->nvmap_client, buf->nvmap_ref);
- kfree(buf);
- }
-}
-
-static void *vb2_dma_nvmap_cookie(void *buf_priv)
-{
- struct vb2_dc_buf *buf = buf_priv;
-
- return &buf->paddr;
-}
-
-static void *vb2_dma_nvmap_vaddr(void *buf_priv)
-{
- struct vb2_dc_buf *buf = buf_priv;
- if (!buf)
- return 0;
-
- return buf->vaddr;
-}
-
-static unsigned int vb2_dma_nvmap_num_users(void *buf_priv)
-{
- struct vb2_dc_buf *buf = buf_priv;
-
- return atomic_read(&buf->refcount);
-}
-
-static int vb2_dma_nvmap_mmap(void *buf_priv, struct vm_area_struct *vma)
-{
- struct vb2_dc_buf *buf = buf_priv;
- unsigned long vm_start, paddr;
- void *vaddr;
- int size;
- int ret;
-
- if (!buf) {
- pr_err("No buffer to map\n");
- return -EINVAL;
- }
-
- size = min_t(unsigned long, vma->vm_end - vma->vm_start, buf->size);
-
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
- for (vaddr = buf->vaddr; vaddr < buf->vaddr + size;
- vaddr += PAGE_SIZE) {
- paddr = page_to_phys(vmalloc_to_page(vaddr));
- vm_start = vma->vm_start + (unsigned long) (vaddr - buf->vaddr);
- ret = remap_pfn_range(vma, vm_start, paddr >> PAGE_SHIFT,
- PAGE_SIZE, vma->vm_page_prot);
- if (ret) {
- pr_err("Remapping memory failed, error: %d\n",
- ret);
- return ret;
- }
- pr_debug("%s: mapped paddr 0x%08lx at 0x%08lx, size %ld\n",
- __func__, paddr, vm_start, PAGE_SIZE);
- }
-
- vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
- vma->vm_private_data = &buf->handler;
- vma->vm_ops = &vb2_common_vm_ops;
-
- vma->vm_ops->open(vma);
-
- return 0;
-}
-
-static void *vb2_dma_nvmap_get_userptr(void *alloc_ctx, unsigned long vaddr,
- unsigned long size, int write)
-{
- struct vb2_dc_buf *buf;
- struct vm_area_struct *vma;
- dma_addr_t paddr = 0;
- int ret;
-
- buf = kzalloc(sizeof(*buf), GFP_KERNEL);
- if (!buf)
- return ERR_PTR(-ENOMEM);
-
- ret = vb2_get_contig_userptr(vaddr, size, &vma, &paddr);
- if (ret) {
- pr_err("Failed acquiring VMA for vaddr 0x%08lx\n",
- vaddr);
- kfree(buf);
- return ERR_PTR(ret);
- }
-
- buf->size = size;
- buf->paddr = paddr;
- buf->vma = vma;
-
- return buf;
-}
-
-static void vb2_dma_nvmap_put_userptr(void *mem_priv)
-{
- struct vb2_dc_buf *buf = mem_priv;
-
- if (!buf)
- return;
-
- vb2_put_vma(buf->vma);
- kfree(buf);
-}
-
-const struct vb2_mem_ops vb2_dma_nvmap_memops = {
- .alloc = vb2_dma_nvmap_alloc,
- .put = vb2_dma_nvmap_put,
- .cookie = vb2_dma_nvmap_cookie,
- .vaddr = vb2_dma_nvmap_vaddr,
- .mmap = vb2_dma_nvmap_mmap,
- .get_userptr = vb2_dma_nvmap_get_userptr,
- .put_userptr = vb2_dma_nvmap_put_userptr,
- .num_users = vb2_dma_nvmap_num_users,
-};
-EXPORT_SYMBOL_GPL(vb2_dma_nvmap_memops);
-
-void *vb2_dma_nvmap_init_ctx(struct device *dev)
-{
- struct vb2_dc_conf *conf;
- int ret;
-
- conf = kzalloc(sizeof(*conf), GFP_KERNEL);
- if (!conf) {
- ret = -ENOMEM;
- goto exit;
- }
-
- conf->dev = dev;
-
- conf->nvmap_client = nvmap_create_client(nvmap_dev,
- "videobuf2-dma-nvmap");
- if (!conf->nvmap_client) {
- ret = -ENOMEM;
- goto exit_free;
- }
-
- return conf;
-
-exit_free:
- kfree(conf);
-exit:
- return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(vb2_dma_nvmap_init_ctx);
-
-void vb2_dma_nvmap_cleanup_ctx(void *alloc_ctx)
-{
- struct vb2_dc_conf *conf = alloc_ctx;
-
- nvmap_client_put(conf->nvmap_client);
-
- kfree(alloc_ctx);
-}
-EXPORT_SYMBOL_GPL(vb2_dma_nvmap_cleanup_ctx);
-
-MODULE_DESCRIPTION("DMA-nvmap memory handling routines for videobuf2");
-MODULE_AUTHOR("Andrew Chew <achew@nvidia.com>");
-MODULE_LICENSE("GPL");
projects / sojka / nv-tegra / linux-3.10.git / commitdiff