blob: b4eb030ea961443c914258dc51d55660f4bc8fee [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* NVIDIA Tegra DRM GEM helper functions
*
* Copyright (C) 2012 Sascha Hauer, Pengutronix
* Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved.
*
* Based on the GEM/CMA helpers
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
*/
#include <linux/dma-buf.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <drm/drm_drv.h>
#include <drm/drm_prime.h>
#include <drm/tegra_drm.h>
#include "drm.h"
#include "gem.h"
MODULE_IMPORT_NS(DMA_BUF);
static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents)
{
dma_addr_t next = ~(dma_addr_t)0;
unsigned int count = 0, i;
struct scatterlist *s;
for_each_sg(sgl, s, nents, i) {
/* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */
if (!sg_dma_len(s))
continue;
if (sg_dma_address(s) != next) {
next = sg_dma_address(s) + sg_dma_len(s);
count++;
}
}
return count;
}
static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt)
{
return sg_dma_count_chunks(sgt->sgl, sgt->nents);
}
static void tegra_bo_put(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
drm_gem_object_put(&obj->gem);
}
static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
enum dma_data_direction direction)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
struct drm_gem_object *gem = &obj->gem;
struct host1x_bo_mapping *map;
int err;
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (!map)
return ERR_PTR(-ENOMEM);
kref_init(&map->ref);
map->bo = host1x_bo_get(bo);
map->direction = direction;
map->dev = dev;
/*
* Imported buffers need special treatment to satisfy the semantics of DMA-BUF.
*/
if (gem->import_attach) {
struct dma_buf *buf = gem->import_attach->dmabuf;
map->attach = dma_buf_attach(buf, dev);
if (IS_ERR(map->attach)) {
err = PTR_ERR(map->attach);
goto free;
}
map->sgt = dma_buf_map_attachment_unlocked(map->attach, direction);
if (IS_ERR(map->sgt)) {
dma_buf_detach(buf, map->attach);
err = PTR_ERR(map->sgt);
map->sgt = NULL;
goto free;
}
err = sgt_dma_count_chunks(map->sgt);
map->size = gem->size;
goto out;
}
/*
* If we don't have a mapping for this buffer yet, return an SG table
* so that host1x can do the mapping for us via the DMA API.
*/
map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
if (!map->sgt) {
err = -ENOMEM;
goto free;
}
if (obj->pages) {
/*
* If the buffer object was allocated from the explicit IOMMU
* API code paths, construct an SG table from the pages.
*/
err = sg_alloc_table_from_pages(map->sgt, obj->pages, obj->num_pages, 0, gem->size,
GFP_KERNEL);
if (err < 0)
goto free;
} else {
/*
* If the buffer object had no pages allocated and if it was
* not imported, it had to be allocated with the DMA API, so
* the DMA API helper can be used.
*/
err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size);
if (err < 0)
goto free;
}
err = dma_map_sgtable(dev, map->sgt, direction, 0);
if (err)
goto free_sgt;
out:
/*
* If we've manually mapped the buffer object through the IOMMU, make sure to return the
* existing IOVA address of our mapping.
*/
if (!obj->mm) {
map->phys = sg_dma_address(map->sgt->sgl);
map->chunks = err;
} else {
map->phys = obj->iova;
map->chunks = 1;
}
map->size = gem->size;
return map;
free_sgt:
sg_free_table(map->sgt);
free:
kfree(map->sgt);
kfree(map);
return ERR_PTR(err);
}
static void tegra_bo_unpin(struct host1x_bo_mapping *map)
{
if (map->attach) {
dma_buf_unmap_attachment_unlocked(map->attach, map->sgt,
map->direction);
dma_buf_detach(map->attach->dmabuf, map->attach);
} else {
dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0);
sg_free_table(map->sgt);
kfree(map->sgt);
}
host1x_bo_put(map->bo);
kfree(map);
}
static void *tegra_bo_mmap(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
struct iosys_map map = { 0 };
void *vaddr;
int ret;
if (obj->vaddr)
return obj->vaddr;
if (obj->gem.import_attach) {
ret = dma_buf_vmap_unlocked(obj->gem.import_attach->dmabuf, &map);
if (ret < 0)
return ERR_PTR(ret);
return map.vaddr;
}
vaddr = vmap(obj->pages, obj->num_pages, VM_MAP,
pgprot_writecombine(PAGE_KERNEL));
if (!vaddr)
return ERR_PTR(-ENOMEM);
return vaddr;
}
static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr);
if (obj->vaddr)
return;
if (obj->gem.import_attach)
return dma_buf_vunmap_unlocked(obj->gem.import_attach->dmabuf, &map);
vunmap(addr);
}
static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
drm_gem_object_get(&obj->gem);
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,
};
static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
{
int prot = IOMMU_READ | IOMMU_WRITE;
int err;
if (bo->mm)
return -EBUSY;
bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
if (!bo->mm)
return -ENOMEM;
mutex_lock(&tegra->mm_lock);
err = drm_mm_insert_node_generic(&tegra->mm,
bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
if (err < 0) {
dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
err);
goto unlock;
}
bo->iova = bo->mm->start;
bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
if (!bo->size) {
dev_err(tegra->drm->dev, "failed to map buffer\n");
err = -ENOMEM;
goto remove;
}
mutex_unlock(&tegra->mm_lock);
return 0;
remove:
drm_mm_remove_node(bo->mm);
unlock:
mutex_unlock(&tegra->mm_lock);
kfree(bo->mm);
return err;
}
static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
{
if (!bo->mm)
return 0;
mutex_lock(&tegra->mm_lock);
iommu_unmap(tegra->domain, bo->iova, bo->size);
drm_mm_remove_node(bo->mm);
mutex_unlock(&tegra->mm_lock);
kfree(bo->mm);
return 0;
}
static const struct drm_gem_object_funcs tegra_gem_object_funcs = {
.free = tegra_bo_free_object,
.export = tegra_gem_prime_export,
.vm_ops = &tegra_bo_vm_ops,
};
static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
size_t size)
{
struct tegra_bo *bo;
int err;
bo = kzalloc(sizeof(*bo), GFP_KERNEL);
if (!bo)
return ERR_PTR(-ENOMEM);
bo->gem.funcs = &tegra_gem_object_funcs;
host1x_bo_init(&bo->base, &tegra_bo_ops);
size = round_up(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;
return bo;
release:
drm_gem_object_release(&bo->gem);
free:
kfree(bo);
return ERR_PTR(err);
}
static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
{
if (bo->pages) {
dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
drm_gem_put_pages(&bo->gem, bo->pages, true, true);
sg_free_table(bo->sgt);
kfree(bo->sgt);
} else if (bo->vaddr) {
dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova);
}
}
static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
{
int err;
bo->pages = drm_gem_get_pages(&bo->gem);
if (IS_ERR(bo->pages))
return PTR_ERR(bo->pages);
bo->num_pages = bo->gem.size >> PAGE_SHIFT;
bo->sgt = drm_prime_pages_to_sg(bo->gem.dev, bo->pages, bo->num_pages);
if (IS_ERR(bo->sgt)) {
err = PTR_ERR(bo->sgt);
goto put_pages;
}
err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
if (err)
goto free_sgt;
return 0;
free_sgt:
sg_free_table(bo->sgt);
kfree(bo->sgt);
put_pages:
drm_gem_put_pages(&bo->gem, bo->pages, false, false);
return err;
}
static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
{
struct tegra_drm *tegra = drm->dev_private;
int err;
if (tegra->domain) {
err = tegra_bo_get_pages(drm, bo);
if (err < 0)
return err;
err = tegra_bo_iommu_map(tegra, bo);
if (err < 0) {
tegra_bo_free(drm, bo);
return err;
}
} else {
size_t size = bo->gem.size;
bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->iova,
GFP_KERNEL | __GFP_NOWARN);
if (!bo->vaddr) {
dev_err(drm->dev,
"failed to allocate buffer of size %zu\n",
size);
return -ENOMEM;
}
}
return 0;
}
struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
unsigned long flags)
{
struct tegra_bo *bo;
int err;
bo = tegra_bo_alloc_object(drm, size);
if (IS_ERR(bo))
return bo;
err = tegra_bo_alloc(drm, bo);
if (err < 0)
goto release;
if (flags & DRM_TEGRA_GEM_CREATE_TILED)
bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
bo->flags |= TEGRA_BO_BOTTOM_UP;
return bo;
release:
drm_gem_object_release(&bo->gem);
kfree(bo);
return ERR_PTR(err);
}
struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
struct drm_device *drm,
size_t size,
unsigned long flags,
u32 *handle)
{
struct tegra_bo *bo;
int err;
bo = tegra_bo_create(drm, size, flags);
if (IS_ERR(bo))
return bo;
err = drm_gem_handle_create(file, &bo->gem, handle);
if (err) {
tegra_bo_free_object(&bo->gem);
return ERR_PTR(err);
}
drm_gem_object_put(&bo->gem);
return bo;
}
static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
struct dma_buf *buf)
{
struct tegra_drm *tegra = drm->dev_private;
struct dma_buf_attachment *attach;
struct tegra_bo *bo;
int err;
bo = tegra_bo_alloc_object(drm, buf->size);
if (IS_ERR(bo))
return bo;
attach = dma_buf_attach(buf, drm->dev);
if (IS_ERR(attach)) {
err = PTR_ERR(attach);
goto free;
}
get_dma_buf(buf);
bo->sgt = dma_buf_map_attachment_unlocked(attach, DMA_TO_DEVICE);
if (IS_ERR(bo->sgt)) {
err = PTR_ERR(bo->sgt);
goto detach;
}
if (tegra->domain) {
err = tegra_bo_iommu_map(tegra, bo);
if (err < 0)
goto detach;
}
bo->gem.import_attach = attach;
return bo;
detach:
if (!IS_ERR_OR_NULL(bo->sgt))
dma_buf_unmap_attachment_unlocked(attach, bo->sgt, DMA_TO_DEVICE);
dma_buf_detach(buf, attach);
dma_buf_put(buf);
free:
drm_gem_object_release(&bo->gem);
kfree(bo);
return ERR_PTR(err);
}
void tegra_bo_free_object(struct drm_gem_object *gem)
{
struct tegra_drm *tegra = gem->dev->dev_private;
struct host1x_bo_mapping *mapping, *tmp;
struct tegra_bo *bo = to_tegra_bo(gem);
/* remove all mappings of this buffer object from any caches */
list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) {
if (mapping->cache)
host1x_bo_unpin(mapping);
else
dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping,
dev_name(mapping->dev));
}
if (tegra->domain)
tegra_bo_iommu_unmap(tegra, bo);
if (gem->import_attach) {
dma_buf_unmap_attachment_unlocked(gem->import_attach, bo->sgt,
DMA_TO_DEVICE);
drm_prime_gem_destroy(gem, NULL);
} else {
tegra_bo_free(gem->dev, bo);
}
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)
{
unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
struct tegra_drm *tegra = drm->dev_private;
struct tegra_bo *bo;
args->pitch = round_up(min_pitch, tegra->pitch_align);
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;
}
static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *gem = vma->vm_private_data;
struct tegra_bo *bo = to_tegra_bo(gem);
struct page *page;
pgoff_t offset;
if (!bo->pages)
return VM_FAULT_SIGBUS;
offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
page = bo->pages[offset];
return vmf_insert_page(vma, vmf->address, page);
}
const struct vm_operations_struct tegra_bo_vm_ops = {
.fault = tegra_bo_fault,
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
{
struct tegra_bo *bo = to_tegra_bo(gem);
if (!bo->pages) {
unsigned long vm_pgoff = vma->vm_pgoff;
int err;
/*
* Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
* and set the vm_pgoff (used as a fake buffer offset by DRM)
* to 0 as we want to map the whole buffer.
*/
vm_flags_clear(vma, VM_PFNMAP);
vma->vm_pgoff = 0;
err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
gem->size);
if (err < 0) {
drm_gem_vm_close(vma);
return err;
}
vma->vm_pgoff = vm_pgoff;
} else {
pgprot_t prot = vm_get_page_prot(vma->vm_flags);
vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP);
vma->vm_page_prot = pgprot_writecombine(prot);
}
return 0;
}
int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
{
struct drm_gem_object *gem;
int err;
err = drm_gem_mmap(file, vma);
if (err < 0)
return err;
gem = vma->vm_private_data;
return __tegra_gem_mmap(gem, vma);
}
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 (bo->pages) {
if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages,
0, gem->size, GFP_KERNEL) < 0)
goto free;
} else {
if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova,
gem->size) < 0)
goto free;
}
if (dma_map_sgtable(attach->dev, sgt, dir, 0))
goto free;
return sgt;
free:
sg_free_table(sgt);
kfree(sgt);
return NULL;
}
static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
struct drm_gem_object *gem = attach->dmabuf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
if (bo->pages)
dma_unmap_sgtable(attach->dev, sgt, dir, 0);
sg_free_table(sgt);
kfree(sgt);
}
static void tegra_gem_prime_release(struct dma_buf *buf)
{
drm_gem_dmabuf_release(buf);
}
static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
enum dma_data_direction direction)
{
struct drm_gem_object *gem = buf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
struct drm_device *drm = gem->dev;
if (bo->pages)
dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
return 0;
}
static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
enum dma_data_direction direction)
{
struct drm_gem_object *gem = buf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
struct drm_device *drm = gem->dev;
if (bo->pages)
dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
return 0;
}
static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
{
struct drm_gem_object *gem = buf->priv;
int err;
err = drm_gem_mmap_obj(gem, gem->size, vma);
if (err < 0)
return err;
return __tegra_gem_mmap(gem, vma);
}
static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map)
{
struct drm_gem_object *gem = buf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
void *vaddr;
vaddr = tegra_bo_mmap(&bo->base);
if (IS_ERR(vaddr))
return PTR_ERR(vaddr);
iosys_map_set_vaddr(map, vaddr);
return 0;
}
static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map)
{
struct drm_gem_object *gem = buf->priv;
struct tegra_bo *bo = to_tegra_bo(gem);
tegra_bo_munmap(&bo->base, map->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,
.begin_cpu_access = tegra_gem_prime_begin_cpu_access,
.end_cpu_access = tegra_gem_prime_end_cpu_access,
.mmap = tegra_gem_prime_mmap,
.vmap = tegra_gem_prime_vmap,
.vunmap = tegra_gem_prime_vunmap,
};
struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
int flags)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
exp_info.exp_name = KBUILD_MODNAME;
exp_info.owner = gem->dev->driver->fops->owner;
exp_info.ops = &tegra_gem_prime_dmabuf_ops;
exp_info.size = gem->size;
exp_info.flags = flags;
exp_info.priv = gem;
return drm_gem_dmabuf_export(gem->dev, &exp_info);
}
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_get(gem);
return gem;
}
}
bo = tegra_bo_import(drm, buf);
if (IS_ERR(bo))
return ERR_CAST(bo);
return &bo->gem;
}
struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle)
{
struct drm_gem_object *gem;
struct tegra_bo *bo;
gem = drm_gem_object_lookup(file, handle);
if (!gem)
return NULL;
bo = to_tegra_bo(gem);
return &bo->base;
}