mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Laurent Pinchart](/assets/img/avatar_default.png)
Use the %pad printk specifier to print dma_addr_t variables. This fixes warnings on platforms where dma_addr_t has a different size than int or size_t. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
371 lines
9 KiB
C
371 lines
9 KiB
C
/*
|
|
* 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_PTR(PTR_ERR(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);
|