- 根目录:
- drivers
- gpu
- drm
- exynos
- exynos_drm_gem.c
/* exynos_drm_gem.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Author: Inki Dae <inki.dae@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <drm/drmP.h>
#include <drm/drm_vma_manager.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_iommu.h"
static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
{
struct drm_device *dev = exynos_gem->base.dev;
enum dma_attr attr;
unsigned int nr_pages;
struct sg_table sgt;
int ret = -ENOMEM;
if (exynos_gem->dma_addr) {
DRM_DEBUG_KMS("already allocated.\n");
return 0;
}
init_dma_attrs(&exynos_gem->dma_attrs);
/*
* if EXYNOS_BO_CONTIG, fully physically contiguous memory
* region will be allocated else physically contiguous
* as possible.
*/
if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &exynos_gem->dma_attrs);
/*
* if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
* else cachable mapping.
*/
if (exynos_gem->flags & EXYNOS_BO_WC ||
!(exynos_gem->flags & EXYNOS_BO_CACHABLE))
attr = DMA_ATTR_WRITE_COMBINE;
else
attr = DMA_ATTR_NON_CONSISTENT;
dma_set_attr(attr, &exynos_gem->dma_attrs);
dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &exynos_gem->dma_attrs);
nr_pages = exynos_gem->size >> PAGE_SHIFT;
exynos_gem->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
if (!exynos_gem->pages) {
DRM_ERROR("failed to allocate pages.\n");
return -ENOMEM;
}
exynos_gem->cookie = dma_alloc_attrs(dev->dev, exynos_gem->size,
&exynos_gem->dma_addr, GFP_KERNEL,
&exynos_gem->dma_attrs);
if (!exynos_gem->cookie) {
DRM_ERROR("failed to allocate buffer.\n");
goto err_free;
}
ret = dma_get_sgtable_attrs(dev->dev, &sgt, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to get sgtable.\n");
goto err_dma_free;
}
if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
nr_pages)) {
DRM_ERROR("invalid sgtable.\n");
ret = -EINVAL;
goto err_sgt_free;
}
sg_free_table(&sgt);
DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
(unsigned long)exynos_gem->dma_addr, exynos_gem->size);
return 0;
err_sgt_free:
sg_free_table(&sgt);
err_dma_free:
dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
exynos_gem->dma_addr, &exynos_gem->dma_attrs);
err_free:
drm_free_large(exynos_gem->pages);
return ret;
}
static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
{
struct drm_device *dev = exynos_gem->base.dev;
if (!exynos_gem->dma_addr) {
DRM_DEBUG_KMS("dma_addr is invalid.\n");
return;
}
DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
(unsigned long)exynos_gem->dma_addr, exynos_gem->size);
dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
(dma_addr_t)exynos_gem->dma_addr,
&exynos_gem->dma_attrs);
drm_free_large(exynos_gem->pages);
}
static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
struct drm_file *file_priv,
unsigned int *handle)
{
int ret;
/*
* allocate a id of idr table where the obj is registered
* and handle has the id what user can see.
*/
ret = drm_gem_handle_create(file_priv, obj, handle);
if (ret)
return ret;
DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
/* drop reference from allocate - handle holds it now. */
drm_gem_object_unreference_unlocked(obj);
return 0;
}
void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
{
struct drm_gem_object *obj = &exynos_gem->base;
DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
/*
* do not release memory region from exporter.
*
* the region will be released by exporter
* once dmabuf's refcount becomes 0.
*/
if (obj->import_attach)
drm_prime_gem_destroy(obj, exynos_gem->sgt);
else
exynos_drm_free_buf(exynos_gem);
/* release file pointer to gem object. */
drm_gem_object_release(obj);
kfree(exynos_gem);
}
unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv)
{
struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
return 0;
}
exynos_gem = to_exynos_gem(obj);
drm_gem_object_unreference_unlocked(obj);
return exynos_gem->size;
}
static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
unsigned long size)
{
struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
int ret;
exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
if (!exynos_gem)
return ERR_PTR(-ENOMEM);
exynos_gem->size = size;
obj = &exynos_gem->base;
ret = drm_gem_object_init(dev, obj, size);
if (ret < 0) {
DRM_ERROR("failed to initialize gem object\n");
kfree(exynos_gem);
return ERR_PTR(ret);
}
ret = drm_gem_create_mmap_offset(obj);
if (ret < 0) {
drm_gem_object_release(obj);
kfree(exynos_gem);
return ERR_PTR(ret);
}
DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
return exynos_gem;
}
struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
unsigned int flags,
unsigned long size)
{
struct exynos_drm_gem *exynos_gem;
int ret;
if (flags & ~(EXYNOS_BO_MASK)) {
DRM_ERROR("invalid flags.\n");
return ERR_PTR(-EINVAL);
}
if (!size) {
DRM_ERROR("invalid size.\n");
return ERR_PTR(-EINVAL);
}
size = roundup(size, PAGE_SIZE);
exynos_gem = exynos_drm_gem_init(dev, size);
if (IS_ERR(exynos_gem))
return exynos_gem;
/* set memory type and cache attribute from user side. */
exynos_gem->flags = flags;
ret = exynos_drm_alloc_buf(exynos_gem);
if (ret < 0) {
drm_gem_object_release(&exynos_gem->base);
kfree(exynos_gem);
return ERR_PTR(ret);
}
return exynos_gem;
}
int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_exynos_gem_create *args = data;
struct exynos_drm_gem *exynos_gem;
int ret;
exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
if (IS_ERR(exynos_gem))
return PTR_ERR(exynos_gem);
ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
&args->handle);
if (ret) {
exynos_drm_gem_destroy(exynos_gem);
return ret;
}
return 0;
}
dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *filp)
{
struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(dev, filp, gem_handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
return ERR_PTR(-EINVAL);
}
exynos_gem = to_exynos_gem(obj);
return &exynos_gem->dma_addr;
}
void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *filp)
{
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(dev, filp, gem_handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
return;
}
drm_gem_object_unreference_unlocked(obj);
/*
* decrease obj->refcount one more time because we has already
* increased it at exynos_drm_gem_get_dma_addr().
*/
drm_gem_object_unreference_unlocked(obj);
}
static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
struct vm_area_struct *vma)
{
struct drm_device *drm_dev = exynos_gem->base.dev;
unsigned long vm_size;
int ret;
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_pgoff = 0;
vm_size = vma->vm_end - vma->vm_start;
/* check if user-requested size is valid. */
if (vm_size > exynos_gem->size)
return -EINVAL;
ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem->pages,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to mmap.\n");
return ret;
}
return 0;
}
int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct exynos_drm_gem *exynos_gem;
struct drm_exynos_gem_info *args = data;
struct drm_gem_object *obj;
mutex_lock(&dev->struct_mutex);
obj = drm_gem_object_lookup(dev, file_priv, args->handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}
exynos_gem = to_exynos_gem(obj);
args->flags = exynos_gem->flags;
args->size = exynos_gem->size;
drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);
return 0;
}
int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
struct sg_table *sgt,
enum dma_data_direction dir)
{
int nents;
mutex_lock(&drm_dev->struct_mutex);
nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
if (!nents) {
DRM_ERROR("failed to map sgl with dma.\n");
mutex_unlock(&drm_dev->struct_mutex);
return nents;
}
mutex_unlock(&drm_dev->struct_mutex);
return 0;
}
void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
struct sg_table *sgt,
enum dma_data_direction dir)
{
dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
}
void exynos_drm_gem_free_object(struct drm_gem_object *obj)
{
exynos_drm_gem_destroy(to_exynos_gem(obj));
}
int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
struct exynos_drm_gem *exynos_gem;
unsigned int flags;
int ret;
/*
* allocate memory to be used for framebuffer.
* - this callback would be called by user application
* with DRM_IOCTL_MODE_CREATE_DUMB command.
*/
args->pitch = args->width * ((args->bpp + 7) / 8);
args->size = args->pitch * args->height;
if (is_drm_iommu_supported(dev))
flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
else
flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
if (IS_ERR(exynos_gem)) {
dev_warn(dev->dev, "FB allocation failed.\n");
return PTR_ERR(exynos_gem);
}
ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
&args->handle);
if (ret) {
exynos_drm_gem_destroy(exynos_gem);
return ret;
}
return 0;
}
int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
struct drm_device *dev, uint32_t handle,
uint64_t *offset)
{
struct drm_gem_object *obj;
int ret = 0;
mutex_lock(&dev->struct_mutex);
/*
* get offset of memory allocated for drm framebuffer.
* - this callback would be called by user application
* with DRM_IOCTL_MODE_MAP_DUMB command.
*/
obj = drm_gem_object_lookup(dev, file_priv, handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
ret = -EINVAL;
goto unlock;
}
*offset = drm_vma_node_offset_addr(&obj->vma_node);
DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
drm_gem_object_unreference(obj);
unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct drm_gem_object *obj = vma->vm_private_data;
struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
unsigned long pfn;
pgoff_t page_offset;
int ret;
page_offset = ((unsigned long)vmf->virtual_address -
vma->vm_start) >> PAGE_SHIFT;
if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
DRM_ERROR("invalid page offset\n");
ret = -EINVAL;
goto out;
}
pfn = page_to_pfn(exynos_gem->pages[page_offset]);
ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
out:
switch (ret) {
case 0:
case -ERESTARTSYS:
case -EINTR:
return VM_FAULT_NOPAGE;
case -ENOMEM:
return VM_FAULT_OOM;
default:
return VM_FAULT_SIGBUS;
}
}
int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
int ret;
/* set vm_area_struct. */
ret = drm_gem_mmap(filp, vma);
if (ret < 0) {
DRM_ERROR("failed to mmap.\n");
return ret;
}
obj = vma->vm_private_data;
exynos_gem = to_exynos_gem(obj);
DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
/* non-cachable as default. */
if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
else if (exynos_gem->flags & EXYNOS_BO_WC)
vma->vm_page_prot =
pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
else
vma->vm_page_prot =
pgprot_noncached(vm_get_page_prot(vma->vm_flags));
ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
if (ret)
goto err_close_vm;
return ret;
err_close_vm:
drm_gem_vm_close(vma);
return ret;
}
/* low-level interface prime helpers */
struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
int npages;
npages = exynos_gem->size >> PAGE_SHIFT;
return drm_prime_pages_to_sg(exynos_gem->pages, npages);
}
struct drm_gem_object *
exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt)
{
struct exynos_drm_gem *exynos_gem;
int npages;
int ret;
exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
if (IS_ERR(exynos_gem)) {
ret = PTR_ERR(exynos_gem);
return ERR_PTR(ret);
}
exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
npages = exynos_gem->size >> PAGE_SHIFT;
exynos_gem->pages = drm_malloc_ab(npages, sizeof(struct page *));
if (!exynos_gem->pages) {
ret = -ENOMEM;
goto err;
}
ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
npages);
if (ret < 0)
goto err_free_large;
exynos_gem->sgt = sgt;
if (sgt->nents == 1) {
/* always physically continuous memory if sgt->nents is 1. */
exynos_gem->flags |= EXYNOS_BO_CONTIG;
} else {
/*
* this case could be CONTIG or NONCONTIG type but for now
* sets NONCONTIG.
* TODO. we have to find a way that exporter can notify
* the type of its own buffer to importer.
*/
exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
}
return &exynos_gem->base;
err_free_large:
drm_free_large(exynos_gem->pages);
err:
drm_gem_object_release(&exynos_gem->base);
kfree(exynos_gem);
return ERR_PTR(ret);
}
void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
{
return NULL;
}
void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
/* Nothing to do */
}