blob: 8777b7f757916a704ceaec670c44d34a0aee813d [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 <linux/iommu.h>
#include <drm/tegra_drm.h>
#include "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,
};
/*
* A generic iommu_map_sg() function is being reviewed and will hopefully be
* merged soon. At that point this function can be dropped in favour of the
* one provided by the IOMMU API.
*/
static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents,
int prot)
{
struct scatterlist *s;
size_t offset = 0;
unsigned int i;
int err;
for_each_sg(sg, s, nents, i) {
phys_addr_t phys = page_to_phys(sg_page(s));
size_t length = s->offset + s->length;
err = iommu_map(domain, iova + offset, phys, length, prot);
if (err < 0) {
iommu_unmap(domain, iova, offset);
return err;
}
offset += length;
}
return offset;
}
static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
{
int prot = IOMMU_READ | IOMMU_WRITE;
ssize_t err;
if (bo->mm)
return -EBUSY;
bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
if (!bo->mm)
return -ENOMEM;
err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
PAGE_SIZE, 0, 0, 0);
if (err < 0) {
dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
err);
goto free;
}
bo->paddr = bo->mm->start;
err = __iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
bo->sgt->nents, prot);
if (err < 0) {
dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
goto remove;
}
bo->size = err;
return 0;
remove:
drm_mm_remove_node(bo->mm);
free:
kfree(bo->mm);
return err;
}
static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
{
if (!bo->mm)
return 0;
iommu_unmap(tegra->domain, bo->paddr, bo->size);
drm_mm_remove_node(bo->mm);
kfree(bo->mm);
return 0;
}
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);
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) {
drm_gem_put_pages(&bo->gem, bo->pages, true, true);
sg_free_table(bo->sgt);
kfree(bo->sgt);
} else if (bo->vaddr) {
dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr,
bo->paddr);
}
}
static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
{
struct scatterlist *s;
struct sg_table *sgt;
unsigned int i;
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;
sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
if (IS_ERR(sgt))
goto put_pages;
/*
* Fake up the SG table so that dma_map_sg() can be used to flush the
* pages associated with it. Note that this relies on the fact that
* the DMA API doesn't hook into IOMMU on Tegra, therefore mapping is
* only cache maintenance.
*
* TODO: Replace this by drm_clflash_sg() once it can be implemented
* without relying on symbols that are not exported.
*/
for_each_sg(sgt->sgl, s, sgt->nents, i)
sg_dma_address(s) = sg_phys(s);
if (dma_map_sg(drm->dev, sgt->sgl, sgt->nents, DMA_TO_DEVICE) == 0) {
sgt = ERR_PTR(-ENOMEM);
goto release_sgt;
}
bo->sgt = sgt;
return 0;
release_sgt:
sg_free_table(sgt);
kfree(sgt);
put_pages:
drm_gem_put_pages(&bo->gem, bo->pages, false, false);
return PTR_ERR(sgt);
}
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_writecombine(drm->dev, size, &bo->paddr,
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_unreference_unlocked(&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(attach, DMA_TO_DEVICE);
if (!bo->sgt) {
err = -ENOMEM;
goto detach;
}
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;
} else {
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:
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 tegra_bo *bo = to_tegra_bo(gem);
if (tegra->domain)
tegra_bo_iommu_unmap(tegra, bo);
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_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;
}
int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
u32 handle, u64 *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;
}
static int tegra_bo_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct drm_gem_object *gem = vma->vm_private_data;
struct tegra_bo *bo = to_tegra_bo(gem);
struct page *page;
pgoff_t offset;
int err;
if (!bo->pages)
return VM_FAULT_SIGBUS;
offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT;
page = bo->pages[offset];
err = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
switch (err) {
case -EAGAIN:
case 0:
case -ERESTARTSYS:
case -EINTR:
case -EBUSY:
return VM_FAULT_NOPAGE;
case -ENOMEM:
return VM_FAULT_OOM;
}
return VM_FAULT_SIGBUS;
}
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_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);
if (!bo->pages) {
unsigned long vm_pgoff = vma->vm_pgoff;
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_pgoff = 0;
ret = dma_mmap_writecombine(gem->dev->dev, vma, bo->vaddr,
bo->paddr, gem->size);
if (ret) {
drm_gem_vm_close(vma);
return ret;
}
vma->vm_pgoff = vm_pgoff;
} else {
pgprot_t prot = vm_get_page_prot(vma->vm_flags);
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_page_prot = pgprot_writecombine(prot);
}
return 0;
}
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) {
struct scatterlist *sg;
unsigned int i;
if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
goto free;
for_each_sg(sgt->sgl, sg, bo->num_pages, i)
sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
goto free;
} else {
if (sg_alloc_table(sgt, 1, GFP_KERNEL))
goto free;
sg_dma_address(sgt->sgl) = bo->paddr;
sg_dma_len(sgt->sgl) = gem->size;
}
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_sg(attach->dev, sgt->sgl, sgt->nents, 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, NULL);
}
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;
}