blob: 392ce71ed6a18103db1562ee9024f70f51e6d46e [file] [log] [blame]
/* exynos_drm_gem.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Author: Inki Dae <inki.dae@samsung.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "drmP.h"
#include "drm.h"
#include <linux/shmem_fs.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_buf.h"
static unsigned int convert_to_vm_err_msg(int msg)
{
unsigned int out_msg;
switch (msg) {
case 0:
case -ERESTARTSYS:
case -EINTR:
out_msg = VM_FAULT_NOPAGE;
break;
case -ENOMEM:
out_msg = VM_FAULT_OOM;
break;
default:
out_msg = VM_FAULT_SIGBUS;
break;
}
return out_msg;
}
static int check_gem_flags(unsigned int flags)
{
if (flags & ~(EXYNOS_BO_MASK)) {
DRM_ERROR("invalid flags.\n");
return -EINVAL;
}
return 0;
}
static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
{
if (!IS_NONCONTIG_BUFFER(flags)) {
if (size >= SZ_1M)
return roundup(size, SECTION_SIZE);
else if (size >= SZ_64K)
return roundup(size, SZ_64K);
else
goto out;
}
out:
return roundup(size, PAGE_SIZE);
}
static struct page **exynos_gem_get_pages(struct drm_gem_object *obj,
gfp_t gfpmask)
{
struct inode *inode;
struct address_space *mapping;
struct page *p, **pages;
int i, npages;
/* This is the shared memory object that backs the GEM resource */
inode = obj->filp->f_path.dentry->d_inode;
mapping = inode->i_mapping;
npages = obj->size >> PAGE_SHIFT;
pages = drm_malloc_ab(npages, sizeof(struct page *));
if (pages == NULL)
return ERR_PTR(-ENOMEM);
gfpmask |= mapping_gfp_mask(mapping);
for (i = 0; i < npages; i++) {
p = shmem_read_mapping_page_gfp(mapping, i, gfpmask);
if (IS_ERR(p))
goto fail;
pages[i] = p;
}
return pages;
fail:
while (i--)
page_cache_release(pages[i]);
drm_free_large(pages);
return ERR_PTR(PTR_ERR(p));
}
static void exynos_gem_put_pages(struct drm_gem_object *obj,
struct page **pages,
bool dirty, bool accessed)
{
int i, npages;
npages = obj->size >> PAGE_SHIFT;
for (i = 0; i < npages; i++) {
if (dirty)
set_page_dirty(pages[i]);
if (accessed)
mark_page_accessed(pages[i]);
/* Undo the reference we took when populating the table */
page_cache_release(pages[i]);
}
drm_free_large(pages);
}
static int exynos_drm_gem_map_pages(struct drm_gem_object *obj,
struct vm_area_struct *vma,
unsigned long f_vaddr,
pgoff_t page_offset)
{
struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
unsigned long pfn;
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
unsigned long usize = buf->size;
if (!buf->pages)
return -EINTR;
while (usize > 0) {
pfn = page_to_pfn(buf->pages[page_offset++]);
vm_insert_mixed(vma, f_vaddr, pfn);
f_vaddr += PAGE_SIZE;
usize -= PAGE_SIZE;
}
return 0;
}
pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
return vm_insert_mixed(vma, f_vaddr, pfn);
}
static int exynos_drm_gem_get_pages(struct drm_gem_object *obj)
{
struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
struct scatterlist *sgl;
struct page **pages;
unsigned int npages, i = 0;
int ret;
if (buf->pages) {
DRM_DEBUG_KMS("already allocated.\n");
return -EINVAL;
}
pages = exynos_gem_get_pages(obj, GFP_KERNEL);
if (IS_ERR(pages)) {
DRM_ERROR("failed to get pages.\n");
return PTR_ERR(pages);
}
npages = obj->size >> PAGE_SHIFT;
buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
if (!buf->sgt) {
DRM_ERROR("failed to allocate sg table.\n");
ret = -ENOMEM;
goto err;
}
ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
if (ret < 0) {
DRM_ERROR("failed to initialize sg table.\n");
ret = -EFAULT;
goto err1;
}
sgl = buf->sgt->sgl;
/* set all pages to sg list. */
while (i < npages) {
sg_set_page(sgl, pages[i], PAGE_SIZE, 0);
sg_dma_address(sgl) = page_to_phys(pages[i]);
i++;
sgl = sg_next(sgl);
}
/* add some codes for UNCACHED type here. TODO */
buf->pages = pages;
return ret;
err1:
kfree(buf->sgt);
buf->sgt = NULL;
err:
exynos_gem_put_pages(obj, pages, true, false);
return ret;
}
static void exynos_drm_gem_put_pages(struct drm_gem_object *obj)
{
struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
/*
* if buffer typs is EXYNOS_BO_NONCONTIG then release all pages
* allocated at gem fault handler.
*/
sg_free_table(buf->sgt);
kfree(buf->sgt);
buf->sgt = NULL;
exynos_gem_put_pages(obj, buf->pages, true, false);
buf->pages = NULL;
/* add some codes for UNCACHED type here. TODO */
}
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_obj *exynos_gem_obj)
{
struct drm_gem_object *obj;
DRM_DEBUG_KMS("%s\n", __FILE__);
if (!exynos_gem_obj)
return;
obj = &exynos_gem_obj->base;
DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
if ((exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) &&
exynos_gem_obj->buffer->pages)
exynos_drm_gem_put_pages(obj);
else
exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags,
exynos_gem_obj->buffer);
exynos_drm_fini_buf(obj->dev, exynos_gem_obj->buffer);
exynos_gem_obj->buffer = NULL;
if (obj->map_list.map)
drm_gem_free_mmap_offset(obj);
/* release file pointer to gem object. */
drm_gem_object_release(obj);
kfree(exynos_gem_obj);
exynos_gem_obj = NULL;
}
static struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
unsigned long size)
{
struct exynos_drm_gem_obj *exynos_gem_obj;
struct drm_gem_object *obj;
int ret;
exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
if (!exynos_gem_obj) {
DRM_ERROR("failed to allocate exynos gem object\n");
return NULL;
}
exynos_gem_obj->size = size;
obj = &exynos_gem_obj->base;
ret = drm_gem_object_init(dev, obj, size);
if (ret < 0) {
DRM_ERROR("failed to initialize gem object\n");
kfree(exynos_gem_obj);
return NULL;
}
DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
return exynos_gem_obj;
}
struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
unsigned int flags,
unsigned long size)
{
struct exynos_drm_gem_obj *exynos_gem_obj;
struct exynos_drm_gem_buf *buf;
int ret;
if (!size) {
DRM_ERROR("invalid size.\n");
return ERR_PTR(-EINVAL);
}
size = roundup_gem_size(size, flags);
DRM_DEBUG_KMS("%s\n", __FILE__);
ret = check_gem_flags(flags);
if (ret)
return ERR_PTR(ret);
buf = exynos_drm_init_buf(dev, size);
if (!buf)
return ERR_PTR(-ENOMEM);
exynos_gem_obj = exynos_drm_gem_init(dev, size);
if (!exynos_gem_obj) {
ret = -ENOMEM;
goto err_fini_buf;
}
exynos_gem_obj->buffer = buf;
/* set memory type and cache attribute from user side. */
exynos_gem_obj->flags = flags;
/*
* allocate all pages as desired size if user wants to allocate
* physically non-continuous memory.
*/
if (flags & EXYNOS_BO_NONCONTIG) {
ret = exynos_drm_gem_get_pages(&exynos_gem_obj->base);
if (ret < 0) {
drm_gem_object_release(&exynos_gem_obj->base);
goto err_fini_buf;
}
} else {
ret = exynos_drm_alloc_buf(dev, buf, flags);
if (ret < 0) {
drm_gem_object_release(&exynos_gem_obj->base);
goto err_fini_buf;
}
}
return exynos_gem_obj;
err_fini_buf:
exynos_drm_fini_buf(dev, buf);
return ERR_PTR(ret);
}
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_obj *exynos_gem_obj;
int ret;
DRM_DEBUG_KMS("%s\n", __FILE__);
exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
if (IS_ERR(exynos_gem_obj))
return PTR_ERR(exynos_gem_obj);
ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
&args->handle);
if (ret) {
exynos_drm_gem_destroy(exynos_gem_obj);
return ret;
}
return 0;
}
void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv)
{
struct exynos_drm_gem_obj *exynos_gem_obj;
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 ERR_PTR(-EINVAL);
}
exynos_gem_obj = to_exynos_gem_obj(obj);
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
DRM_DEBUG_KMS("not support NONCONTIG type.\n");
drm_gem_object_unreference_unlocked(obj);
/* TODO */
return ERR_PTR(-EINVAL);
}
return &exynos_gem_obj->buffer->dma_addr;
}
void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv)
{
struct exynos_drm_gem_obj *exynos_gem_obj;
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;
}
exynos_gem_obj = to_exynos_gem_obj(obj);
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
DRM_DEBUG_KMS("not support NONCONTIG type.\n");
drm_gem_object_unreference_unlocked(obj);
/* TODO */
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);
}
int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_exynos_gem_map_off *args = data;
DRM_DEBUG_KMS("%s\n", __FILE__);
DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
args->handle, (unsigned long)args->offset);
if (!(dev->driver->driver_features & DRIVER_GEM)) {
DRM_ERROR("does not support GEM.\n");
return -ENODEV;
}
return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
&args->offset);
}
static int exynos_drm_gem_mmap_buffer(struct file *filp,
struct vm_area_struct *vma)
{
struct drm_gem_object *obj = filp->private_data;
struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
struct exynos_drm_gem_buf *buffer;
unsigned long pfn, vm_size, usize, uaddr = vma->vm_start;
int ret;
DRM_DEBUG_KMS("%s\n", __FILE__);
vma->vm_flags |= (VM_IO | VM_RESERVED);
/* in case of direct mapping, always having non-cachable attribute */
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
vm_size = usize = vma->vm_end - vma->vm_start;
/*
* a buffer contains information to physically continuous memory
* allocated by user request or at framebuffer creation.
*/
buffer = exynos_gem_obj->buffer;
/* check if user-requested size is valid. */
if (vm_size > buffer->size)
return -EINVAL;
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
int i = 0;
if (!buffer->pages)
return -EINVAL;
do {
ret = vm_insert_page(vma, uaddr, buffer->pages[i++]);
if (ret) {
DRM_ERROR("failed to remap user space.\n");
return ret;
}
uaddr += PAGE_SIZE;
usize -= PAGE_SIZE;
} while (usize > 0);
} else {
/*
* get page frame number to physical memory to be mapped
* to user space.
*/
pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >>
PAGE_SHIFT;
DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
vma->vm_page_prot)) {
DRM_ERROR("failed to remap pfn range.\n");
return -EAGAIN;
}
}
return 0;
}
static const struct file_operations exynos_drm_gem_fops = {
.mmap = exynos_drm_gem_mmap_buffer,
};
int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_exynos_gem_mmap *args = data;
struct drm_gem_object *obj;
unsigned int addr;
DRM_DEBUG_KMS("%s\n", __FILE__);
if (!(dev->driver->driver_features & DRIVER_GEM)) {
DRM_ERROR("does not support GEM.\n");
return -ENODEV;
}
obj = drm_gem_object_lookup(dev, file_priv, args->handle);
if (!obj) {
DRM_ERROR("failed to lookup gem object.\n");
return -EINVAL;
}
obj->filp->f_op = &exynos_drm_gem_fops;
obj->filp->private_data = obj;
addr = vm_mmap(obj->filp, 0, args->size,
PROT_READ | PROT_WRITE, MAP_SHARED, 0);
drm_gem_object_unreference_unlocked(obj);
if (IS_ERR((void *)addr))
return PTR_ERR((void *)addr);
args->mapped = addr;
DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
return 0;
}
int exynos_drm_gem_init_object(struct drm_gem_object *obj)
{
DRM_DEBUG_KMS("%s\n", __FILE__);
return 0;
}
void exynos_drm_gem_free_object(struct drm_gem_object *obj)
{
DRM_DEBUG_KMS("%s\n", __FILE__);
exynos_drm_gem_destroy(to_exynos_gem_obj(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_obj *exynos_gem_obj;
int ret;
DRM_DEBUG_KMS("%s\n", __FILE__);
/*
* alocate 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 >> 3;
args->size = PAGE_ALIGN(args->pitch * args->height);
exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
if (IS_ERR(exynos_gem_obj))
return PTR_ERR(exynos_gem_obj);
ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
&args->handle);
if (ret) {
exynos_drm_gem_destroy(exynos_gem_obj);
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 exynos_drm_gem_obj *exynos_gem_obj;
struct drm_gem_object *obj;
int ret = 0;
DRM_DEBUG_KMS("%s\n", __FILE__);
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;
}
exynos_gem_obj = to_exynos_gem_obj(obj);
if (!exynos_gem_obj->base.map_list.map) {
ret = drm_gem_create_mmap_offset(&exynos_gem_obj->base);
if (ret)
goto out;
}
*offset = (u64)exynos_gem_obj->base.map_list.hash.key << PAGE_SHIFT;
DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
out:
drm_gem_object_unreference(obj);
unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
struct drm_device *dev,
unsigned int handle)
{
int ret;
DRM_DEBUG_KMS("%s\n", __FILE__);
/*
* obj->refcount and obj->handle_count are decreased and
* if both them are 0 then exynos_drm_gem_free_object()
* would be called by callback to release resources.
*/
ret = drm_gem_handle_delete(file_priv, handle);
if (ret < 0) {
DRM_ERROR("failed to delete drm_gem_handle.\n");
return ret;
}
return 0;
}
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_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
struct drm_device *dev = obj->dev;
unsigned long f_vaddr;
pgoff_t page_offset;
int ret;
page_offset = ((unsigned long)vmf->virtual_address -
vma->vm_start) >> PAGE_SHIFT;
f_vaddr = (unsigned long)vmf->virtual_address;
mutex_lock(&dev->struct_mutex);
/*
* allocate all pages as desired size if user wants to allocate
* physically non-continuous memory.
*/
if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
ret = exynos_drm_gem_get_pages(obj);
if (ret < 0)
goto err;
}
ret = exynos_drm_gem_map_pages(obj, vma, f_vaddr, page_offset);
if (ret < 0)
DRM_ERROR("failed to map pages.\n");
err:
mutex_unlock(&dev->struct_mutex);
return convert_to_vm_err_msg(ret);
}
int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
int ret;
DRM_DEBUG_KMS("%s\n", __FILE__);
/* set vm_area_struct. */
ret = drm_gem_mmap(filp, vma);
if (ret < 0) {
DRM_ERROR("failed to mmap.\n");
return ret;
}
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
return ret;
}