drivers/gpu/drm/vmwgfx/vmwgfx_gem.c - linux/kernel/git/torvalds/linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
 /*
  * Copyright 2021 VMware, Inc.
  *
  * 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 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 THE AUTHORS OR COPYRIGHT HOLDERS
  * 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 "vmwgfx_drv.h"

 #include "drm/drm_prime.h"
 #include "drm/drm_gem_ttm_helper.h"

 /**
  * vmw_buffer_object - Convert a struct ttm_buffer_object to a struct
  * vmw_buffer_object.
  *
  * @bo: Pointer to the TTM buffer object.
  * Return: Pointer to the struct vmw_buffer_object embedding the
  * TTM buffer object.
  */
 static struct vmw_buffer_object *
 vmw_buffer_object(struct ttm_buffer_object *bo)
 {
 	return container_of(bo, struct vmw_buffer_object, base);
 }

 static void vmw_gem_object_free(struct drm_gem_object *gobj)
 {
 	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
 	if (bo) {
 		ttm_bo_put(bo);
 	}
 }

 static int vmw_gem_object_open(struct drm_gem_object *obj,
 			       struct drm_file *file_priv)
 {
 	return 0;
 }

 static void vmw_gem_object_close(struct drm_gem_object *obj,
 				 struct drm_file *file_priv)
 {
 }

 static int vmw_gem_pin_private(struct drm_gem_object *obj, bool do_pin)
 {
 	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
 	struct vmw_buffer_object *vbo = vmw_buffer_object(bo);
 	int ret;

 	ret = ttm_bo_reserve(bo, false, false, NULL);
 	if (unlikely(ret != 0))
 		goto err;

 	vmw_bo_pin_reserved(vbo, do_pin);

 	ttm_bo_unreserve(bo);

 err:
 	return ret;
 }


 static int vmw_gem_object_pin(struct drm_gem_object *obj)
 {
 	return vmw_gem_pin_private(obj, true);
 }

 static void vmw_gem_object_unpin(struct drm_gem_object *obj)
 {
 	vmw_gem_pin_private(obj, false);
 }

 static struct sg_table *vmw_gem_object_get_sg_table(struct drm_gem_object *obj)
 {
 	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
 	struct vmw_ttm_tt *vmw_tt =
 		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);

 	if (vmw_tt->vsgt.sgt)
 		return vmw_tt->vsgt.sgt;

 	return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
 }


 static const struct drm_gem_object_funcs vmw_gem_object_funcs = {
 	.free = vmw_gem_object_free,
 	.open = vmw_gem_object_open,
 	.close = vmw_gem_object_close,
 	.print_info = drm_gem_ttm_print_info,
 	.pin = vmw_gem_object_pin,
 	.unpin = vmw_gem_object_unpin,
 	.get_sg_table = vmw_gem_object_get_sg_table,
 	.vmap = drm_gem_ttm_vmap,
 	.vunmap = drm_gem_ttm_vunmap,
 	.mmap = drm_gem_ttm_mmap,
 };

 /**
  * vmw_gem_destroy - vmw buffer object destructor
  *
  * @bo: Pointer to the embedded struct ttm_buffer_object
  */
 void vmw_gem_destroy(struct ttm_buffer_object *bo)
 {
 	struct vmw_buffer_object *vbo = vmw_buffer_object(bo);

 	WARN_ON(vbo->dirty);
 	WARN_ON(!RB_EMPTY_ROOT(&vbo->res_tree));
 	vmw_bo_unmap(vbo);
 	drm_gem_object_release(&vbo->base.base);
 	kfree(vbo);
 }

 int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
 				      struct drm_file *filp,
 				      uint32_t size,
 				      uint32_t *handle,
 				      struct vmw_buffer_object **p_vbo)
 {
 	int ret;

 	ret = vmw_bo_create(dev_priv, size,
 			    (dev_priv->has_mob) ?
 				    &vmw_sys_placement :
 				    &vmw_vram_sys_placement,
 			    true, false, &vmw_gem_destroy, p_vbo);

 	(*p_vbo)->base.base.funcs = &vmw_gem_object_funcs;
 	if (ret != 0)
 		goto out_no_bo;

 	ret = drm_gem_handle_create(filp, &(*p_vbo)->base.base, handle);
 	/* drop reference from allocate - handle holds it now */
 	drm_gem_object_put(&(*p_vbo)->base.base);
 out_no_bo:
 	return ret;
 }


 int vmw_gem_object_create_ioctl(struct drm_device *dev, void *data,
 				struct drm_file *filp)
 {
 	struct vmw_private *dev_priv = vmw_priv(dev);
 	union drm_vmw_alloc_dmabuf_arg *arg =
 	    (union drm_vmw_alloc_dmabuf_arg *)data;
 	struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 	struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 	struct vmw_buffer_object *vbo;
 	uint32_t handle;
 	int ret;

 	ret = vmw_gem_object_create_with_handle(dev_priv, filp,
 						req->size, &handle, &vbo);
 	if (ret)
 		goto out_no_bo;

 	rep->handle = handle;
 	rep->map_handle = drm_vma_node_offset_addr(&vbo->base.base.vma_node);
 	rep->cur_gmr_id = handle;
 	rep->cur_gmr_offset = 0;
 out_no_bo:
 	return ret;
 }

 #if defined(CONFIG_DEBUG_FS)

 static void vmw_bo_print_info(int id, struct vmw_buffer_object *bo, struct seq_file *m)
 {
 	const char *placement;
 	const char *type;

 	switch (bo->base.resource->mem_type) {
 	case TTM_PL_SYSTEM:
 		placement = " CPU";
 		break;
 	case VMW_PL_GMR:
 		placement = " GMR";
 		break;
 	case VMW_PL_MOB:
 		placement = " MOB";
 		break;
 	case VMW_PL_SYSTEM:
 		placement = "VCPU";
 		break;
 	case TTM_PL_VRAM:
 		placement = "VRAM";
 		break;
 	default:
 		placement = "None";
 		break;
 	}

 	switch (bo->base.type) {
 	case ttm_bo_type_device:
 		type = "device";
 		break;
 	case ttm_bo_type_kernel:
 		type = "kernel";
 		break;
 	case ttm_bo_type_sg:
 		type = "sg    ";
 		break;
 	default:
 		type = "none  ";
 		break;
 	}

 	seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
 		   id, bo->base.base.size, placement, type);
 	seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
 		   bo->base.priority,
 		   bo->base.pin_count,
 		   kref_read(&bo->base.base.refcount),
 		   kref_read(&bo->base.kref));
 	seq_puts(m, "\n");
 }

 static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
 {
 	struct vmw_private *vdev = (struct vmw_private *)m->private;
 	struct drm_device *dev = &vdev->drm;
 	struct drm_file *file;
 	int r;

 	r = mutex_lock_interruptible(&dev->filelist_mutex);
 	if (r)
 		return r;

 	list_for_each_entry(file, &dev->filelist, lhead) {
 		struct task_struct *task;
 		struct drm_gem_object *gobj;
 		int id;

 		/*
 		 * Although we have a valid reference on file->pid, that does
 		 * not guarantee that the task_struct who called get_pid() is
 		 * still alive (e.g. get_pid(current) => fork() => exit()).
 		 * Therefore, we need to protect this ->comm access using RCU.
 		 */
 		rcu_read_lock();
 		task = pid_task(file->pid, PIDTYPE_PID);
 		seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
 			   task ? task->comm : "<unknown>");
 		rcu_read_unlock();

 		spin_lock(&file->table_lock);
 		idr_for_each_entry(&file->object_idr, gobj, id) {
 			struct vmw_buffer_object *bo = gem_to_vmw_bo(gobj);

 			vmw_bo_print_info(id, bo, m);
 		}
 		spin_unlock(&file->table_lock);
 	}

 	mutex_unlock(&dev->filelist_mutex);
 	return 0;
 }

 DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);

 #endif

 void vmw_debugfs_gem_init(struct vmw_private *vdev)
 {
 #if defined(CONFIG_DEBUG_FS)
 	struct drm_minor *minor = vdev->drm.primary;
 	struct dentry *root = minor->debugfs_root;

 	debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
 			    &vmw_debugfs_gem_info_fops);
 #endif
 }
	/* SPDX-License-Identifier: GPL-2.0 OR MIT */
	/*
	* Copyright 2021 VMware, Inc.
	*
	* 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 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 THE AUTHORS OR COPYRIGHT HOLDERS
	* 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 "vmwgfx_drv.h"

	#include "drm/drm_prime.h"
	#include "drm/drm_gem_ttm_helper.h"

	/**
	* vmw_buffer_object - Convert a struct ttm_buffer_object to a struct
	* vmw_buffer_object.
	*
	* @bo: Pointer to the TTM buffer object.
	* Return: Pointer to the struct vmw_buffer_object embedding the
	* TTM buffer object.
	*/
	static struct vmw_buffer_object *
	vmw_buffer_object(struct ttm_buffer_object *bo)
	{
	return container_of(bo, struct vmw_buffer_object, base);
	}

	static void vmw_gem_object_free(struct drm_gem_object *gobj)
	{
	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gobj);
	if (bo) {
	ttm_bo_put(bo);
	}
	}

	static int vmw_gem_object_open(struct drm_gem_object *obj,
	struct drm_file *file_priv)
	{
	return 0;
	}

	static void vmw_gem_object_close(struct drm_gem_object *obj,
	struct drm_file *file_priv)
	{
	}

	static int vmw_gem_pin_private(struct drm_gem_object *obj, bool do_pin)
	{
	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
	struct vmw_buffer_object *vbo = vmw_buffer_object(bo);
	int ret;

	ret = ttm_bo_reserve(bo, false, false, NULL);
	if (unlikely(ret != 0))
	goto err;

	vmw_bo_pin_reserved(vbo, do_pin);

	ttm_bo_unreserve(bo);

	err:
	return ret;
	}


	static int vmw_gem_object_pin(struct drm_gem_object *obj)
	{
	return vmw_gem_pin_private(obj, true);
	}

	static void vmw_gem_object_unpin(struct drm_gem_object *obj)
	{
	vmw_gem_pin_private(obj, false);
	}

	static struct sg_table vmw_gem_object_get_sg_table(struct drm_gem_object obj)
	{
	struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(obj);
	struct vmw_ttm_tt *vmw_tt =
	container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm);

	if (vmw_tt->vsgt.sgt)
	return vmw_tt->vsgt.sgt;

	return drm_prime_pages_to_sg(obj->dev, vmw_tt->dma_ttm.pages, vmw_tt->dma_ttm.num_pages);
	}


	static const struct drm_gem_object_funcs vmw_gem_object_funcs = {
	.free = vmw_gem_object_free,
	.open = vmw_gem_object_open,
	.close = vmw_gem_object_close,
	.print_info = drm_gem_ttm_print_info,
	.pin = vmw_gem_object_pin,
	.unpin = vmw_gem_object_unpin,
	.get_sg_table = vmw_gem_object_get_sg_table,
	.vmap = drm_gem_ttm_vmap,
	.vunmap = drm_gem_ttm_vunmap,
	.mmap = drm_gem_ttm_mmap,
	};

	/**
	* vmw_gem_destroy - vmw buffer object destructor
	*
	* @bo: Pointer to the embedded struct ttm_buffer_object
	*/
	void vmw_gem_destroy(struct ttm_buffer_object *bo)
	{
	struct vmw_buffer_object *vbo = vmw_buffer_object(bo);

	WARN_ON(vbo->dirty);
	WARN_ON(!RB_EMPTY_ROOT(&vbo->res_tree));
	vmw_bo_unmap(vbo);
	drm_gem_object_release(&vbo->base.base);
	kfree(vbo);
	}

	int vmw_gem_object_create_with_handle(struct vmw_private *dev_priv,
	struct drm_file *filp,
	uint32_t size,
	uint32_t *handle,
	struct vmw_buffer_object **p_vbo)
	{
	int ret;

	ret = vmw_bo_create(dev_priv, size,
	(dev_priv->has_mob) ?
	&vmw_sys_placement :
	&vmw_vram_sys_placement,
	true, false, &vmw_gem_destroy, p_vbo);

	(*p_vbo)->base.base.funcs = &vmw_gem_object_funcs;
	if (ret != 0)
	goto out_no_bo;

	ret = drm_gem_handle_create(filp, &(*p_vbo)->base.base, handle);
	/* drop reference from allocate - handle holds it now */
	drm_gem_object_put(&(*p_vbo)->base.base);
	out_no_bo:
	return ret;
	}


	int vmw_gem_object_create_ioctl(struct drm_device dev, void data,
	struct drm_file *filp)
	{
	struct vmw_private *dev_priv = vmw_priv(dev);
	union drm_vmw_alloc_dmabuf_arg *arg =
	(union drm_vmw_alloc_dmabuf_arg *)data;
	struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
	struct drm_vmw_dmabuf_rep *rep = &arg->rep;
	struct vmw_buffer_object *vbo;
	uint32_t handle;
	int ret;

	ret = vmw_gem_object_create_with_handle(dev_priv, filp,
	req->size, &handle, &vbo);
	if (ret)
	goto out_no_bo;

	rep->handle = handle;
	rep->map_handle = drm_vma_node_offset_addr(&vbo->base.base.vma_node);
	rep->cur_gmr_id = handle;
	rep->cur_gmr_offset = 0;
	out_no_bo:
	return ret;
	}

	#if defined(CONFIG_DEBUG_FS)

	static void vmw_bo_print_info(int id, struct vmw_buffer_object bo, struct seq_file m)
	{
	const char *placement;
	const char *type;

	switch (bo->base.resource->mem_type) {
	case TTM_PL_SYSTEM:
	placement = " CPU";
	break;
	case VMW_PL_GMR:
	placement = " GMR";
	break;
	case VMW_PL_MOB:
	placement = " MOB";
	break;
	case VMW_PL_SYSTEM:
	placement = "VCPU";
	break;
	case TTM_PL_VRAM:
	placement = "VRAM";
	break;
	default:
	placement = "None";
	break;
	}

	switch (bo->base.type) {
	case ttm_bo_type_device:
	type = "device";
	break;
	case ttm_bo_type_kernel:
	type = "kernel";
	break;
	case ttm_bo_type_sg:
	type = "sg ";
	break;
	default:
	type = "none ";
	break;
	}

	seq_printf(m, "\t\t0x%08x: %12zu bytes %s, type = %s",
	id, bo->base.base.size, placement, type);
	seq_printf(m, ", priority = %u, pin_count = %u, GEM refs = %d, TTM refs = %d",
	bo->base.priority,
	bo->base.pin_count,
	kref_read(&bo->base.base.refcount),
	kref_read(&bo->base.kref));
	seq_puts(m, "\n");
	}

	static int vmw_debugfs_gem_info_show(struct seq_file m, void unused)
	{
	struct vmw_private vdev = (struct vmw_private )m->private;
	struct drm_device *dev = &vdev->drm;
	struct drm_file *file;
	int r;

	r = mutex_lock_interruptible(&dev->filelist_mutex);
	if (r)
	return r;

	list_for_each_entry(file, &dev->filelist, lhead) {
	struct task_struct *task;
	struct drm_gem_object *gobj;
	int id;

	/*
	* Although we have a valid reference on file->pid, that does
	* not guarantee that the task_struct who called get_pid() is
	* still alive (e.g. get_pid(current) => fork() => exit()).
	* Therefore, we need to protect this ->comm access using RCU.
	*/
	rcu_read_lock();
	task = pid_task(file->pid, PIDTYPE_PID);
	seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
	task ? task->comm : "<unknown>");
	rcu_read_unlock();

	spin_lock(&file->table_lock);
	idr_for_each_entry(&file->object_idr, gobj, id) {
	struct vmw_buffer_object *bo = gem_to_vmw_bo(gobj);

	vmw_bo_print_info(id, bo, m);
	}
	spin_unlock(&file->table_lock);
	}

	mutex_unlock(&dev->filelist_mutex);
	return 0;
	}

	DEFINE_SHOW_ATTRIBUTE(vmw_debugfs_gem_info);

	#endif

	void vmw_debugfs_gem_init(struct vmw_private *vdev)
	{
	#if defined(CONFIG_DEBUG_FS)
	struct drm_minor *minor = vdev->drm.primary;
	struct dentry *root = minor->debugfs_root;

	debugfs_create_file("vmwgfx_gem_info", 0444, root, vdev,
	&vmw_debugfs_gem_info_fops);
	#endif
	}