/*
* Copyright (c) 2017-2018, 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/dma-buf.h>
#include <linux/version.h>
#include <uapi/linux/nvgpu.h>
#ifdef CONFIG_NVGPU_USE_TEGRA_ALLOC_FD
#include <linux/platform/tegra/tegra_fd.h>
#endif
#include <nvgpu/dma.h>
#include <nvgpu/enabled.h>
#include <nvgpu/vidmem.h>
#include <nvgpu/nvgpu_mem.h>
#include <nvgpu/page_allocator.h>
#include <nvgpu/gk20a.h>
#include <nvgpu/linux/vm.h>
#include <nvgpu/linux/dma.h>
#include "gk20a/mm_gk20a.h"
#include "dmabuf_vidmem.h"
bool nvgpu_addr_is_vidmem_page_alloc(u64 addr)
{
return !!(addr & 1ULL);
}
void nvgpu_vidmem_set_page_alloc(struct scatterlist *sgl, u64 addr)
{
/* set bit 0 to indicate vidmem allocation */
sg_dma_address(sgl) = (addr | 1ULL);
}
struct nvgpu_page_alloc *nvgpu_vidmem_get_page_alloc(struct scatterlist *sgl)
{
u64 addr;
addr = sg_dma_address(sgl);
if (nvgpu_addr_is_vidmem_page_alloc(addr))
addr = addr & ~1ULL;
else
WARN_ON(1);
return (struct nvgpu_page_alloc *)(uintptr_t)addr;
}
static struct sg_table *gk20a_vidbuf_map_dma_buf(
struct dma_buf_attachment *attach, enum dma_data_direction dir)
{
struct nvgpu_vidmem_buf *buf = attach->dmabuf->priv;
return buf->mem->priv.sgt;
}
static void gk20a_vidbuf_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
}
static void gk20a_vidbuf_release(struct dma_buf *dmabuf)
{
struct nvgpu_vidmem_buf *buf = dmabuf->priv;
struct nvgpu_vidmem_linux *linux_buf = buf->priv;
struct gk20a *g = buf->g;
vidmem_dbg(g, "Releasing Linux VIDMEM buf: dmabuf=0x%p size=%zuKB",
dmabuf, buf->mem->size >> 10);
if (linux_buf && linux_buf->dmabuf_priv_delete)
linux_buf->dmabuf_priv_delete(linux_buf->dmabuf_priv);
nvgpu_kfree(g, linux_buf);
nvgpu_vidmem_buf_free(g, buf);
gk20a_put(g);
}
static void *gk20a_vidbuf_kmap(struct dma_buf *dmabuf, unsigned long page_num)
{
WARN_ON("Not supported");
return NULL;
}
static void *gk20a_vidbuf_kmap_atomic(struct dma_buf *dmabuf,
unsigned long page_num)
{
WARN_ON("Not supported");
return NULL;
}
static int gk20a_vidbuf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
{
return -EINVAL;
}
static int gk20a_vidbuf_set_private(struct dma_buf *dmabuf,
struct device *dev, void *priv, void (*delete)(void *priv))
{
struct nvgpu_vidmem_buf *buf = dmabuf->priv;
struct nvgpu_vidmem_linux *linux_buf = buf->priv;
linux_buf->dmabuf_priv = priv;
linux_buf->dmabuf_priv_delete = delete;
return 0;
}
static void *gk20a_vidbuf_get_private(struct dma_buf *dmabuf,
struct device *dev)
{
struct nvgpu_vidmem_buf *buf = dmabuf->priv;
struct nvgpu_vidmem_linux *linux_buf = buf->priv;
return linux_buf->dmabuf_priv;
}
static const struct dma_buf_ops gk20a_vidbuf_ops = {
.map_dma_buf = gk20a_vidbuf_map_dma_buf,
.unmap_dma_buf = gk20a_vidbuf_unmap_dma_buf,
.release = gk20a_vidbuf_release,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
.map_atomic = gk20a_vidbuf_kmap_atomic,
.map = gk20a_vidbuf_kmap,
#else
.kmap_atomic = gk20a_vidbuf_kmap_atomic,
.kmap = gk20a_vidbuf_kmap,
#endif
.mmap = gk20a_vidbuf_mmap,
.set_drvdata = gk20a_vidbuf_set_private,
.get_drvdata = gk20a_vidbuf_get_private,
};
static struct dma_buf *gk20a_vidbuf_export(struct nvgpu_vidmem_buf *buf)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
exp_info.priv = buf;
exp_info.ops = &gk20a_vidbuf_ops;
exp_info.size = buf->mem->size;
exp_info.flags = O_RDWR;
return dma_buf_export(&exp_info);
}
struct gk20a *nvgpu_vidmem_buf_owner(struct dma_buf *dmabuf)
{
struct nvgpu_vidmem_buf *buf = dmabuf->priv;
if (dmabuf->ops != &gk20a_vidbuf_ops)
return NULL;
return buf->g;
}
int nvgpu_vidmem_export_linux(struct gk20a *g, size_t bytes)
{
struct nvgpu_vidmem_buf *buf = NULL;
struct nvgpu_vidmem_linux *priv;
int err, fd;
/*
* This ref is released when the dma_buf is closed.
*/
if (!gk20a_get(g))
return -ENODEV;
vidmem_dbg(g, "Allocating vidmem buf: %zu bytes", bytes);
priv = nvgpu_kzalloc(g, sizeof(*priv));
if (!priv) {
err = -ENOMEM;
goto fail;
}
buf = nvgpu_vidmem_user_alloc(g, bytes);
if (IS_ERR(buf)) {
err = PTR_ERR(buf);
goto fail;
}
priv->dmabuf = gk20a_vidbuf_export(buf);
if (IS_ERR(priv->dmabuf)) {
err = PTR_ERR(priv->dmabuf);
goto fail;
}
buf->priv = priv;
#ifdef CONFIG_NVGPU_USE_TEGRA_ALLOC_FD
fd = tegra_alloc_fd(current->files, 1024, O_RDWR);
#else
fd = get_unused_fd_flags(O_RDWR);
#endif
if (fd < 0) {
/* ->release frees what we have done */
dma_buf_put(priv->dmabuf);
return fd;
}
/* fclose() on this drops one ref, freeing the dma buf */
fd_install(fd, priv->dmabuf->file);
vidmem_dbg(g, "Alloced Linux VIDMEM buf: dmabuf=0x%p size=%zuKB",
priv->dmabuf, buf->mem->size >> 10);
return fd;
fail:
nvgpu_vidmem_buf_free(g, buf);
nvgpu_kfree(g, priv);
gk20a_put(g);
vidmem_dbg(g, "Failed to alloc Linux VIDMEM buf: %d", err);
return err;
}
int nvgpu_vidmem_buf_access_memory(struct gk20a *g, struct dma_buf *dmabuf,
void *buffer, u64 offset, u64 size, u32 cmd)
{
struct nvgpu_vidmem_buf *vidmem_buf;
struct nvgpu_mem *mem;
int err = 0;
if (gk20a_dmabuf_aperture(g, dmabuf) != APERTURE_VIDMEM)
return -EINVAL;
vidmem_buf = dmabuf->priv;
mem = vidmem_buf->mem;
nvgpu_speculation_barrier();
switch (cmd) {
case NVGPU_DBG_GPU_IOCTL_ACCESS_FB_MEMORY_CMD_READ:
nvgpu_mem_rd_n(g, mem, offset, buffer, size);
break;
case NVGPU_DBG_GPU_IOCTL_ACCESS_FB_MEMORY_CMD_WRITE:
nvgpu_mem_wr_n(g, mem, offset, buffer, size);
break;
default:
err = -EINVAL;
}
return err;
}
void __nvgpu_mem_free_vidmem_alloc(struct gk20a *g, struct nvgpu_mem *vidmem)
{
nvgpu_free(vidmem->allocator,
(u64)nvgpu_vidmem_get_page_alloc(vidmem->priv.sgt->sgl));
nvgpu_free_sgtable(g, &vidmem->priv.sgt);
}
