drivers/gpu/drm/rockchip/rockchip_drm_gem.c - kernel/bruno - Git at Google

 /*
  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
  * Author:Mark Yao <mark.yao@rock-chips.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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 <drm/drm.h>
 #include <drm/drmP.h>
 #include <drm/drm_gem.h>
 #include <drm/drm_vma_manager.h>

 #include <linux/dma-attrs.h>

 #include "rockchip_drm_drv.h"
 #include "rockchip_drm_gem.h"

 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
 				  bool alloc_kmap)
 {
 	struct drm_gem_object *obj = &rk_obj->base;
 	struct drm_device *drm = obj->dev;

 	init_dma_attrs(&rk_obj->dma_attrs);
 	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);

 	if (!alloc_kmap)
 		dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);

 	rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
 					 &rk_obj->dma_addr, GFP_KERNEL,
 					 &rk_obj->dma_attrs);
 	if (!rk_obj->kvaddr) {
 		DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size);
 		return -ENOMEM;
 	}

 	return 0;
 }

 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
 {
 	struct drm_gem_object *obj = &rk_obj->base;
 	struct drm_device *drm = obj->dev;

 	dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
 		       &rk_obj->dma_attrs);
 }

 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 					struct vm_area_struct *vma)

 {
 	int ret;
 	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 	struct drm_device *drm = obj->dev;

 	/*
 	 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
 	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
 	 */
 	vma->vm_flags &= ~VM_PFNMAP;
 	vma->vm_pgoff = 0;

 	ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
 			     obj->size, &rk_obj->dma_attrs);
 	if (ret)
 		drm_gem_vm_close(vma);

 	return ret;
 }

 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
 			  struct vm_area_struct *vma)
 {
 	int ret;

 	ret = drm_gem_mmap_obj(obj, obj->size, vma);
 	if (ret)
 		return ret;

 	return rockchip_drm_gem_object_mmap(obj, vma);
 }

 /* drm driver mmap file operations */
 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 {
 	struct drm_gem_object *obj;
 	int ret;

 	ret = drm_gem_mmap(filp, vma);
 	if (ret)
 		return ret;

 	obj = vma->vm_private_data;

 	return rockchip_drm_gem_object_mmap(obj, vma);
 }

 struct rockchip_gem_object *
 	rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
 				   bool alloc_kmap)
 {
 	struct rockchip_gem_object *rk_obj;
 	struct drm_gem_object *obj;
 	int ret;

 	size = round_up(size, PAGE_SIZE);

 	rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
 	if (!rk_obj)
 		return ERR_PTR(-ENOMEM);

 	obj = &rk_obj->base;

 	drm_gem_private_object_init(drm, obj, size);

 	ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
 	if (ret)
 		goto err_free_rk_obj;

 	return rk_obj;

 err_free_rk_obj:
 	kfree(rk_obj);
 	return ERR_PTR(ret);
 }

 /*
  * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
  * function
  */
 void rockchip_gem_free_object(struct drm_gem_object *obj)
 {
 	struct rockchip_gem_object *rk_obj;

 	drm_gem_free_mmap_offset(obj);

 	rk_obj = to_rockchip_obj(obj);

 	rockchip_gem_free_buf(rk_obj);

 	kfree(rk_obj);
 }

 /*
  * rockchip_gem_create_with_handle - allocate an object with the given
  * size and create a gem handle on it
  *
  * returns a struct rockchip_gem_object* on success or ERR_PTR values
  * on failure.
  */
 static struct rockchip_gem_object *
 rockchip_gem_create_with_handle(struct drm_file *file_priv,
 				struct drm_device *drm, unsigned int size,
 				unsigned int *handle)
 {
 	struct rockchip_gem_object *rk_obj;
 	struct drm_gem_object *obj;
 	int ret;

 	rk_obj = rockchip_gem_create_object(drm, size, false);
 	if (IS_ERR(rk_obj))
 		return ERR_CAST(rk_obj);

 	obj = &rk_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, obj, handle);
 	if (ret)
 		goto err_handle_create;

 	/* drop reference from allocate - handle holds it now. */
 	drm_gem_object_unreference_unlocked(obj);

 	return rk_obj;

 err_handle_create:
 	rockchip_gem_free_object(obj);

 	return ERR_PTR(ret);
 }

 int rockchip_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;

 	obj = drm_gem_object_lookup(dev, file_priv, handle);
 	if (!obj) {
 		DRM_ERROR("failed to lookup gem object.\n");
 		return -EINVAL;
 	}

 	ret = drm_gem_create_mmap_offset(obj);
 	if (ret)
 		goto out;

 	*offset = drm_vma_node_offset_addr(&obj->vma_node);
 	DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);

 out:
 	drm_gem_object_unreference_unlocked(obj);

 	return 0;
 }

 /*
  * rockchip_gem_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 rockchip_gem_dumb_create(struct drm_file *file_priv,
 			     struct drm_device *dev,
 			     struct drm_mode_create_dumb *args)
 {
 	struct rockchip_gem_object *rk_obj;
 	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);

 	/*
 	 * align to 64 bytes since Mali requires it.
 	 */
 	min_pitch = ALIGN(min_pitch, 64);

 	if (args->pitch < min_pitch)
 		args->pitch = min_pitch;

 	if (args->size < args->pitch * args->height)
 		args->size = args->pitch * args->height;

 	rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
 						 &args->handle);

 	return PTR_ERR_OR_ZERO(rk_obj);
 }

 /*
  * Allocate a sg_table for this GEM object.
  * Note: Both the table's contents, and the sg_table itself must be freed by
  *       the caller.
  * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
  */
 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
 {
 	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 	struct drm_device *drm = obj->dev;
 	struct sg_table *sgt;
 	int ret;

 	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 	if (!sgt)
 		return ERR_PTR(-ENOMEM);

 	ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
 				    rk_obj->dma_addr, obj->size,
 				    &rk_obj->dma_attrs);
 	if (ret) {
 		DRM_ERROR("failed to allocate sgt, %d\n", ret);
 		kfree(sgt);
 		return ERR_PTR(ret);
 	}

 	return sgt;
 }

 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
 {
 	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);

 	if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
 		return NULL;

 	return rk_obj->kvaddr;
 }

 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 {
 	/* Nothing to do */
 }
	/*
	* Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
	* Author:Mark Yao <mark.yao@rock-chips.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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 <drm/drm.h>
	#include <drm/drmP.h>
	#include <drm/drm_gem.h>
	#include <drm/drm_vma_manager.h>

	#include <linux/dma-attrs.h>

	#include "rockchip_drm_drv.h"
	#include "rockchip_drm_gem.h"

	static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
	bool alloc_kmap)
	{
	struct drm_gem_object *obj = &rk_obj->base;
	struct drm_device *drm = obj->dev;

	init_dma_attrs(&rk_obj->dma_attrs);
	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);

	if (!alloc_kmap)
	dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);

	rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
	&rk_obj->dma_addr, GFP_KERNEL,
	&rk_obj->dma_attrs);
	if (!rk_obj->kvaddr) {
	DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size);
	return -ENOMEM;
	}

	return 0;
	}

	static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
	{
	struct drm_gem_object *obj = &rk_obj->base;
	struct drm_device *drm = obj->dev;

	dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
	&rk_obj->dma_attrs);
	}

	static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
	struct vm_area_struct *vma)

	{
	int ret;
	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
	struct drm_device *drm = obj->dev;

	/*
	* dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
	* VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
	*/
	vma->vm_flags &= ~VM_PFNMAP;
	vma->vm_pgoff = 0;

	ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
	obj->size, &rk_obj->dma_attrs);
	if (ret)
	drm_gem_vm_close(vma);

	return ret;
	}

	int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
	struct vm_area_struct *vma)
	{
	int ret;

	ret = drm_gem_mmap_obj(obj, obj->size, vma);
	if (ret)
	return ret;

	return rockchip_drm_gem_object_mmap(obj, vma);
	}

	/* drm driver mmap file operations */
	int rockchip_gem_mmap(struct file filp, struct vm_area_struct vma)
	{
	struct drm_gem_object *obj;
	int ret;

	ret = drm_gem_mmap(filp, vma);
	if (ret)
	return ret;

	obj = vma->vm_private_data;

	return rockchip_drm_gem_object_mmap(obj, vma);
	}

	struct rockchip_gem_object *
	rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
	bool alloc_kmap)
	{
	struct rockchip_gem_object *rk_obj;
	struct drm_gem_object *obj;
	int ret;

	size = round_up(size, PAGE_SIZE);

	rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
	if (!rk_obj)
	return ERR_PTR(-ENOMEM);

	obj = &rk_obj->base;

	drm_gem_private_object_init(drm, obj, size);

	ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
	if (ret)
	goto err_free_rk_obj;

	return rk_obj;

	err_free_rk_obj:
	kfree(rk_obj);
	return ERR_PTR(ret);
	}

	/*
	* rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
	* function
	*/
	void rockchip_gem_free_object(struct drm_gem_object *obj)
	{
	struct rockchip_gem_object *rk_obj;

	drm_gem_free_mmap_offset(obj);

	rk_obj = to_rockchip_obj(obj);

	rockchip_gem_free_buf(rk_obj);

	kfree(rk_obj);
	}

	/*
	* rockchip_gem_create_with_handle - allocate an object with the given
	* size and create a gem handle on it
	*
	* returns a struct rockchip_gem_object* on success or ERR_PTR values
	* on failure.
	*/
	static struct rockchip_gem_object *
	rockchip_gem_create_with_handle(struct drm_file *file_priv,
	struct drm_device *drm, unsigned int size,
	unsigned int *handle)
	{
	struct rockchip_gem_object *rk_obj;
	struct drm_gem_object *obj;
	int ret;

	rk_obj = rockchip_gem_create_object(drm, size, false);
	if (IS_ERR(rk_obj))
	return ERR_CAST(rk_obj);

	obj = &rk_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, obj, handle);
	if (ret)
	goto err_handle_create;

	/* drop reference from allocate - handle holds it now. */
	drm_gem_object_unreference_unlocked(obj);

	return rk_obj;

	err_handle_create:
	rockchip_gem_free_object(obj);

	return ERR_PTR(ret);
	}

	int rockchip_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;

	obj = drm_gem_object_lookup(dev, file_priv, handle);
	if (!obj) {
	DRM_ERROR("failed to lookup gem object.\n");
	return -EINVAL;
	}

	ret = drm_gem_create_mmap_offset(obj);
	if (ret)
	goto out;

	*offset = drm_vma_node_offset_addr(&obj->vma_node);
	DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);

	out:
	drm_gem_object_unreference_unlocked(obj);

	return 0;
	}

	/*
	* rockchip_gem_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 rockchip_gem_dumb_create(struct drm_file *file_priv,
	struct drm_device *dev,
	struct drm_mode_create_dumb *args)
	{
	struct rockchip_gem_object *rk_obj;
	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);

	/*
	* align to 64 bytes since Mali requires it.
	*/
	min_pitch = ALIGN(min_pitch, 64);

	if (args->pitch < min_pitch)
	args->pitch = min_pitch;

	if (args->size < args->pitch * args->height)
	args->size = args->pitch * args->height;

	rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
	&args->handle);

	return PTR_ERR_OR_ZERO(rk_obj);
	}

	/*
	* Allocate a sg_table for this GEM object.
	* Note: Both the table's contents, and the sg_table itself must be freed by
	* the caller.
	* Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
	*/
	struct sg_table rockchip_gem_prime_get_sg_table(struct drm_gem_object obj)
	{
	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
	struct drm_device *drm = obj->dev;
	struct sg_table *sgt;
	int ret;

	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
	if (!sgt)
	return ERR_PTR(-ENOMEM);

	ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
	rk_obj->dma_addr, obj->size,
	&rk_obj->dma_attrs);
	if (ret) {
	DRM_ERROR("failed to allocate sgt, %d\n", ret);
	kfree(sgt);
	return ERR_PTR(ret);
	}

	return sgt;
	}

	void rockchip_gem_prime_vmap(struct drm_gem_object obj)
	{
	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);

	if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
	return NULL;

	return rk_obj->kvaddr;
	}

	void rockchip_gem_prime_vunmap(struct drm_gem_object obj, void vaddr)
	{
	/* Nothing to do */
	}