linux/drivers/gpu/drm/drm_gem_cma_helper.c

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/*
* drm gem CMA (contiguous memory allocator) helper functions
*
* Copyright (C) 2012 Sascha Hauer, Pengutronix
*
* Based on Samsung Exynos code
*
* 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
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <drm/drmP.h>
#include <drm/drm.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_vma_manager.h>
/*
* __drm_gem_cma_create - Create a GEM CMA object without allocating memory
* @drm: The drm device
* @size: The GEM object size
*
* This function creates and initializes a GEM CMA object of the given size, but
* doesn't allocate any memory to back the object.
*
* Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure.
*/
static struct drm_gem_cma_object *
__drm_gem_cma_create(struct drm_device *drm, unsigned int size)
{
struct drm_gem_cma_object *cma_obj;
struct drm_gem_object *gem_obj;
int ret;
cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
if (!cma_obj)
return ERR_PTR(-ENOMEM);
gem_obj = &cma_obj->base;
ret = drm_gem_object_init(drm, gem_obj, size);
if (ret)
goto error;
ret = drm_gem_create_mmap_offset(gem_obj);
if (ret) {
drm_gem_object_release(gem_obj);
goto error;
}
return cma_obj;
error:
kfree(cma_obj);
return ERR_PTR(ret);
}
/*
* drm_gem_cma_create - allocate an object with the given size
*
* returns a struct drm_gem_cma_object* on success or ERR_PTR values
* on failure.
*/
struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
unsigned int size)
{
struct drm_gem_cma_object *cma_obj;
int ret;
size = round_up(size, PAGE_SIZE);
cma_obj = __drm_gem_cma_create(drm, size);
if (IS_ERR(cma_obj))
return cma_obj;
cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
&cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN);
if (!cma_obj->vaddr) {
dev_err(drm->dev, "failed to allocate buffer with size %d\n",
size);
ret = -ENOMEM;
goto error;
}
return cma_obj;
error:
drm_gem_cma_free_object(&cma_obj->base);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_create);
/*
* drm_gem_cma_create_with_handle - allocate an object with the given
* size and create a gem handle on it
*
* returns a struct drm_gem_cma_object* on success or ERR_PTR values
* on failure.
*/
static struct drm_gem_cma_object *drm_gem_cma_create_with_handle(
struct drm_file *file_priv,
struct drm_device *drm, unsigned int size,
unsigned int *handle)
{
struct drm_gem_cma_object *cma_obj;
struct drm_gem_object *gem_obj;
int ret;
cma_obj = drm_gem_cma_create(drm, size);
if (IS_ERR(cma_obj))
return cma_obj;
gem_obj = &cma_obj->base;
/*
* 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, gem_obj, handle);
if (ret)
goto err_handle_create;
/* drop reference from allocate - handle holds it now. */
drm_gem_object_unreference_unlocked(gem_obj);
return cma_obj;
err_handle_create:
drm_gem_cma_free_object(gem_obj);
return ERR_PTR(ret);
}
/*
* drm_gem_cma_free_object - (struct drm_driver)->gem_free_object callback
* function
*/
void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
{
struct drm_gem_cma_object *cma_obj;
drm_gem_free_mmap_offset(gem_obj);
cma_obj = to_drm_gem_cma_obj(gem_obj);
if (cma_obj->vaddr) {
dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
cma_obj->vaddr, cma_obj->paddr);
} else if (gem_obj->import_attach) {
drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
}
drm_gem_object_release(gem_obj);
kfree(cma_obj);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_free_object);
/*
* drm_gem_cma_dumb_create - (struct drm_driver)->dumb_create callback
* function
*
* This aligns the pitch and size arguments to the minimum required. wrap
* this into your own function if you need bigger alignment.
*/
int drm_gem_cma_dumb_create(struct drm_file *file_priv,
struct drm_device *dev, struct drm_mode_create_dumb *args)
{
struct drm_gem_cma_object *cma_obj;
int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
if (args->pitch < min_pitch)
args->pitch = min_pitch;
if (args->size < args->pitch * args->height)
args->size = args->pitch * args->height;
cma_obj = drm_gem_cma_create_with_handle(file_priv, dev,
args->size, &args->handle);
return PTR_ERR_OR_ZERO(cma_obj);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
/*
* drm_gem_cma_dumb_map_offset - (struct drm_driver)->dumb_map_offset callback
* function
*/
int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
struct drm_device *drm, uint32_t handle, uint64_t *offset)
{
struct drm_gem_object *gem_obj;
mutex_lock(&drm->struct_mutex);
gem_obj = drm_gem_object_lookup(drm, file_priv, handle);
if (!gem_obj) {
dev_err(drm->dev, "failed to lookup gem object\n");
mutex_unlock(&drm->struct_mutex);
return -EINVAL;
}
*offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
drm_gem_object_unreference(gem_obj);
mutex_unlock(&drm->struct_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset);
const struct vm_operations_struct drm_gem_cma_vm_ops = {
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops);
static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
struct vm_area_struct *vma)
{
int ret;
/*
* 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;
ret = dma_mmap_writecombine(cma_obj->base.dev->dev, vma,
cma_obj->vaddr, cma_obj->paddr,
vma->vm_end - vma->vm_start);
if (ret)
drm_gem_vm_close(vma);
return ret;
}
/*
* drm_gem_cma_mmap - (struct file_operation)->mmap callback function
*/
int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_gem_cma_object *cma_obj;
struct drm_gem_object *gem_obj;
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
gem_obj = vma->vm_private_data;
cma_obj = to_drm_gem_cma_obj(gem_obj);
return drm_gem_cma_mmap_obj(cma_obj, vma);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);
#ifdef CONFIG_DEBUG_FS
void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m)
{
struct drm_gem_object *obj = &cma_obj->base;
struct drm_device *dev = obj->dev;
uint64_t off;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
off = drm_vma_node_start(&obj->vma_node);
seq_printf(m, "%2d (%2d) %08llx %pad %p %d",
obj->name, obj->refcount.refcount.counter,
off, &cma_obj->paddr, cma_obj->vaddr, obj->size);
seq_printf(m, "\n");
}
EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
#endif
/* low-level interface prime helpers */
struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
{
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
struct sg_table *sgt;
int ret;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return NULL;
ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
cma_obj->paddr, obj->size);
if (ret < 0)
goto out;
return sgt;
out:
kfree(sgt);
return NULL;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
struct drm_gem_object *
drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
struct sg_table *sgt)
{
struct drm_gem_cma_object *cma_obj;
if (sgt->nents != 1)
return ERR_PTR(-EINVAL);
/* Create a CMA GEM buffer. */
cma_obj = __drm_gem_cma_create(dev, size);
if (IS_ERR(cma_obj))
return ERR_CAST(cma_obj);
cma_obj->paddr = sg_dma_address(sgt->sgl);
cma_obj->sgt = sgt;
DRM_DEBUG_PRIME("dma_addr = %pad, size = %zu\n", &cma_obj->paddr, size);
return &cma_obj->base;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
struct drm_gem_cma_object *cma_obj;
struct drm_device *dev = obj->dev;
int ret;
mutex_lock(&dev->struct_mutex);
ret = drm_gem_mmap_obj(obj, obj->size, vma);
mutex_unlock(&dev->struct_mutex);
if (ret < 0)
return ret;
cma_obj = to_drm_gem_cma_obj(obj);
return drm_gem_cma_mmap_obj(cma_obj, vma);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
{
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
return cma_obj->vaddr;
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
/* Nothing to do */
}
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);