blob: aa85b7b26f105e5d7528358d6c150b1cc33d8a4e [file] [log] [blame]
/*
* NVIDIA Tegra DRM GEM helper functions
*
* Copyright (C) 2012 Sascha Hauer, Pengutronix
* Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
*
* Based on the GEM/CMA helpers
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/dma-buf.h>
#include <drm/tegra_drm.h>
#include "gem.h"
static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
{
return container_of(bo, struct tegra_bo, base);
}
static void tegra_bo_put(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
struct drm_device *drm = obj->gem.dev;
mutex_lock(&drm->struct_mutex);
drm_gem_object_unreference(&obj->gem);
mutex_unlock(&drm->struct_mutex);
}
static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
return obj->paddr;
}
static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
{
}
static void *tegra_bo_mmap(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
return obj->vaddr;
}
static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
{
}
static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
return obj->vaddr + page * PAGE_SIZE;
}
static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
void *addr)
{
}
static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
struct drm_device *drm = obj->gem.dev;
mutex_lock(&drm->struct_mutex);
drm_gem_object_reference(&obj->gem);
mutex_unlock(&drm->struct_mutex);
return bo;
}
static const struct host1x_bo_ops tegra_bo_ops = {
.get = tegra_bo_get,
.put = tegra_bo_put,
.pin = tegra_bo_pin,
.unpin = tegra_bo_unpin,
.mmap = tegra_bo_mmap,
.munmap = tegra_bo_munmap,
.kmap = tegra_bo_kmap,
.kunmap = tegra_bo_kunmap,
};
static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
{
dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
}
struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
unsigned long flags)
{
struct tegra_bo *bo;
int err;
bo = kzalloc(sizeof(*bo), GFP_KERNEL);
if (!bo)
return ERR_PTR(-ENOMEM);
host1x_bo_init(&bo->base, &tegra_bo_ops);
size = round_up(size, PAGE_SIZE);
bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
GFP_KERNEL | __GFP_NOWARN);
if (!bo->vaddr) {
dev_err(drm->dev, "failed to allocate buffer with size %u\n",
size);
err = -ENOMEM;
goto err_dma;
}
err = drm_gem_object_init(drm, &bo->gem, size);
if (err)
goto err_init;
err = drm_gem_create_mmap_offset(&bo->gem);
if (err)
goto err_mmap;
if (flags & DRM_TEGRA_GEM_CREATE_TILED)
bo->flags |= TEGRA_BO_TILED;
if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
bo->flags |= TEGRA_BO_BOTTOM_UP;
return bo;
err_mmap:
drm_gem_object_release(&bo->gem);
err_init:
tegra_bo_destroy(drm, bo);
err_dma:
kfree(bo);
return ERR_PTR(err);
}
struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
struct drm_device *drm,
unsigned int size,
unsigned long flags,
unsigned int *handle)
{
struct tegra_bo *bo;
int ret;
bo = tegra_bo_create(drm, size, flags);
if (IS_ERR(bo))
return bo;
ret = drm_gem_handle_create(file, &bo->gem, handle);
if (ret)
goto err;
drm_gem_object_unreference_unlocked(&bo->gem);
return bo;
err:
tegra_bo_free_object(&bo->gem);
return ERR_PTR(ret);
}
static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
struct dma_buf *buf)
{
struct dma_buf_attachment *attach;
struct tegra_bo *bo;
ssize_t size;
int err;
bo = kzalloc(sizeof(*bo), GFP_KERNEL);
if (!bo)
return ERR_PTR(-ENOMEM);
host1x_bo_init(&bo->base, &tegra_bo_ops);
size = round_up(buf->size, PAGE_SIZE);
err = drm_gem_object_init(drm, &bo->gem, size);
if (err < 0)
goto free;
err = drm_gem_create_mmap_offset(&bo->gem);
if (err < 0)
goto release;
attach = dma_buf_attach(buf, drm->dev);
if (IS_ERR(attach)) {
err = PTR_ERR(attach);
goto free_mmap;
}
get_dma_buf(buf);
bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
if (!bo->sgt) {
err = -ENOMEM;
goto detach;
}
if (IS_ERR(bo->sgt)) {
err = PTR_ERR(bo->sgt);
goto detach;
}
if (bo->sgt->nents > 1) {
err = -EINVAL;
goto detach;
}
bo->paddr = sg_dma_address(bo->sgt->sgl);
bo->gem.import_attach = attach;
return bo;
detach:
if (!IS_ERR_OR_NULL(bo->sgt))
dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
dma_buf_detach(buf, attach);
dma_buf_put(buf);
free_mmap:
drm_gem_free_mmap_offset(&bo->gem);
release:
drm_gem_object_release(&bo->gem);
free:
kfree(bo);
return ERR_PTR(err);
}
void tegra_bo_free_object(struct drm_gem_object *gem)
{
struct tegra_bo *bo = to_tegra_bo(gem);
if (gem->import_attach) {
dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
DMA_TO_DEVICE);
drm_prime_gem_destroy(gem, NULL);
} else {
tegra_bo_destroy(gem->dev, bo);
}
drm_gem_free_mmap_offset(gem);
drm_gem_object_release(gem);
kfree(bo);
}
int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
struct drm_mode_create_dumb *args)
{
int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
struct tegra_bo *bo;
if (args->pitch < min_pitch)
args->pitch = min_pitch;
if (args->size < args->pitch * args->height)
args->size = args->pitch * args->height;
bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
&args->handle);
if (IS_ERR(bo))
return PTR_ERR(bo);
return 0;
}
int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
uint32_t handle, uint64_t *offset)
{
struct drm_gem_object *gem;
struct tegra_bo *bo;
mutex_lock(&drm->struct_mutex);
gem = drm_gem_object_lookup(drm, file, handle);
if (!gem) {
dev_err(drm->dev, "failed to lookup GEM object\n");
mutex_unlock(&drm->struct_mutex);
return -EINVAL;
}
bo = to_tegra_bo(gem);
*offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
drm_gem_object_unreference(gem);
mutex_unlock(&drm->struct_mutex);
return 0;
}
const struct vm_operations_struct tegra_bo_vm_ops = {
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
{
struct drm_gem_object *gem;
struct tegra_bo *bo;
int ret;
ret = drm_gem_mmap(file, vma);
if (ret)
return ret;
gem = vma->vm_private_data;
bo = to_tegra_bo(gem);
ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
if (ret)
drm_gem_vm_close(vma);
return ret;
}
static struct sg_table *
tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
{
struct drm_gem_object *gem = attach->dmabuf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
struct sg_table *sgt;
sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return NULL;
if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
kfree(sgt);
return NULL;
}
sg_dma_address(sgt->sgl) = bo->paddr;
sg_dma_len(sgt->sgl) = gem->size;
return sgt;
}
static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
sg_free_table(sgt);
kfree(sgt);
}
static void tegra_gem_prime_release(struct dma_buf *buf)
{
drm_gem_dmabuf_release(buf);
}
static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
unsigned long page)
{
return NULL;
}
static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
unsigned long page,
void *addr)
{
}
static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
{
return NULL;
}
static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
void *addr)
{
}
static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
{
return -EINVAL;
}
static void *tegra_gem_prime_vmap(struct dma_buf *buf)
{
struct drm_gem_object *gem = buf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
return bo->vaddr;
}
static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
{
}
static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
.map_dma_buf = tegra_gem_prime_map_dma_buf,
.unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
.release = tegra_gem_prime_release,
.kmap_atomic = tegra_gem_prime_kmap_atomic,
.kunmap_atomic = tegra_gem_prime_kunmap_atomic,
.kmap = tegra_gem_prime_kmap,
.kunmap = tegra_gem_prime_kunmap,
.mmap = tegra_gem_prime_mmap,
.vmap = tegra_gem_prime_vmap,
.vunmap = tegra_gem_prime_vunmap,
};
struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
struct drm_gem_object *gem,
int flags)
{
return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
flags);
}
struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
struct dma_buf *buf)
{
struct tegra_bo *bo;
if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
struct drm_gem_object *gem = buf->priv;
if (gem->dev == drm) {
drm_gem_object_reference(gem);
return gem;
}
}
bo = tegra_bo_import(drm, buf);
if (IS_ERR(bo))
return ERR_CAST(bo);
return &bo->gem;
}