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|
// 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 <drm/drm_drv.h>
#include <drm/drm_prime.h>
#include <drm/tegra_drm.h>
#include "drm.h"
#include "gem.h"
static void tegra_bo_put(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
drm_gem_object_put(&obj->gem);
}
/* XXX move this into lib/scatterlist.c? */
static int sg_alloc_table_from_sg(struct sg_table *sgt, struct scatterlist *sg,
unsigned int nents, gfp_t gfp_mask)
{
struct scatterlist *dst;
unsigned int i;
int err;
err = sg_alloc_table(sgt, nents, gfp_mask);
if (err < 0)
return err;
dst = sgt->sgl;
for (i = 0; i < nents; i++) {
sg_set_page(dst, sg_page(sg), sg->length, 0);
dst = sg_next(dst);
sg = sg_next(sg);
}
return 0;
}
static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
dma_addr_t *phys)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
struct sg_table *sgt;
int err;
/*
* If we've manually mapped the buffer object through the IOMMU, make
* sure to return the IOVA address of our mapping.
*
* Similarly, for buffers that have been allocated by the DMA API the
* physical address can be used for devices that are not attached to
* an IOMMU. For these devices, callers must pass a valid pointer via
* the @phys argument.
*
* Imported buffers were also already mapped at import time, so the
* existing mapping can be reused.
*/
if (phys) {
*phys = obj->iova;
return NULL;
}
/*
* 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.
*/
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return ERR_PTR(-ENOMEM);
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(sgt, obj->pages, obj->num_pages,
0, obj->gem.size, GFP_KERNEL);
if (err < 0)
goto free;
} else if (obj->sgt) {
/*
* If the buffer object already has an SG table but no pages
* were allocated for it, it means the buffer was imported and
* the SG table needs to be copied to avoid overwriting any
* other potential users of the original SG table.
*/
err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl, obj->sgt->nents,
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, sgt, obj->vaddr, obj->iova,
obj->gem.size);
if (err < 0)
goto free;
}
return sgt;
free:
kfree(sgt);
return ERR_PTR(err);
}
static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt)
{
if (sgt) {
sg_free_table(sgt);
kfree(sgt);
}
}
static void *tegra_bo_mmap(struct host1x_bo *bo)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
if (obj->vaddr)
return obj->vaddr;
else if (obj->gem.import_attach)
return dma_buf_vmap(obj->gem.import_attach->dmabuf);
else
return vmap(obj->pages, obj->num_pages, VM_MAP,
pgprot_writecombine(PAGE_KERNEL));
}
static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
{
struct tegra_bo *obj = host1x_to_tegra_bo(bo);
if (obj->vaddr)
return;
else if (obj->gem.import_attach)
dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
else
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_sg(tegra->domain, bo->iova, bo->sgt->sgl,
bo->sgt->nents, 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_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
DMA_FROM_DEVICE);
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_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
DMA_FROM_DEVICE);
if (err == 0) {
err = -EFAULT;
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(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(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;
}
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.
*/
vma->vm_flags &= ~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);
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_flags &= ~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_sg(attach->dev, sgt->sgl, sgt->nents, 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_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 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_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
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_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
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 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,
.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;
}
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