vmwgfx_resource.c 44.1 KB
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/**************************************************************************
 *
 * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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 "vmwgfx_drv.h"
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#include <drm/vmwgfx_drm.h>
#include <drm/ttm/ttm_object.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/drmP.h>
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#include "vmwgfx_resource_priv.h"
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#define VMW_RES_EVICT_ERR_COUNT 10

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struct vmw_user_dma_buffer {
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	struct ttm_prime_object prime;
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	struct vmw_dma_buffer dma;
};

struct vmw_bo_user_rep {
	uint32_t handle;
	uint64_t map_handle;
};

struct vmw_stream {
	struct vmw_resource res;
	uint32_t stream_id;
};

struct vmw_user_stream {
	struct ttm_base_object base;
	struct vmw_stream stream;
};

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static uint64_t vmw_user_stream_size;

static const struct vmw_res_func vmw_stream_func = {
	.res_type = vmw_res_stream,
	.needs_backup = false,
	.may_evict = false,
	.type_name = "video streams",
	.backup_placement = NULL,
	.create = NULL,
	.destroy = NULL,
	.bind = NULL,
	.unbind = NULL
};

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static inline struct vmw_dma_buffer *
vmw_dma_buffer(struct ttm_buffer_object *bo)
{
	return container_of(bo, struct vmw_dma_buffer, base);
}

static inline struct vmw_user_dma_buffer *
vmw_user_dma_buffer(struct ttm_buffer_object *bo)
{
	struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
	return container_of(vmw_bo, struct vmw_user_dma_buffer, dma);
}

struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
{
	kref_get(&res->kref);
	return res;
}

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struct vmw_resource *
vmw_resource_reference_unless_doomed(struct vmw_resource *res)
{
	return kref_get_unless_zero(&res->kref) ? res : NULL;
}
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/**
 * vmw_resource_release_id - release a resource id to the id manager.
 *
 * @res: Pointer to the resource.
 *
 * Release the resource id to the resource id manager and set it to -1
 */
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void vmw_resource_release_id(struct vmw_resource *res)
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{
	struct vmw_private *dev_priv = res->dev_priv;
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	struct idr *idr = &dev_priv->res_idr[res->func->res_type];
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	write_lock(&dev_priv->resource_lock);
	if (res->id != -1)
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		idr_remove(idr, res->id);
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	res->id = -1;
	write_unlock(&dev_priv->resource_lock);
}

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static void vmw_resource_release(struct kref *kref)
{
	struct vmw_resource *res =
	    container_of(kref, struct vmw_resource, kref);
	struct vmw_private *dev_priv = res->dev_priv;
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	int id;
	struct idr *idr = &dev_priv->res_idr[res->func->res_type];
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	res->avail = false;
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	list_del_init(&res->lru_head);
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	write_unlock(&dev_priv->resource_lock);
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	if (res->backup) {
		struct ttm_buffer_object *bo = &res->backup->base;

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		ttm_bo_reserve(bo, false, false, false, NULL);
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		if (!list_empty(&res->mob_head) &&
		    res->func->unbind != NULL) {
			struct ttm_validate_buffer val_buf;

			val_buf.bo = bo;
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			val_buf.shared = false;
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			res->func->unbind(res, false, &val_buf);
		}
		res->backup_dirty = false;
		list_del_init(&res->mob_head);
		ttm_bo_unreserve(bo);
		vmw_dmabuf_unreference(&res->backup);
	}
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	if (likely(res->hw_destroy != NULL)) {
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		res->hw_destroy(res);
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		mutex_lock(&dev_priv->binding_mutex);
		vmw_context_binding_res_list_kill(&res->binding_head);
		mutex_unlock(&dev_priv->binding_mutex);
	}
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	id = res->id;
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	if (res->res_free != NULL)
		res->res_free(res);
	else
		kfree(res);

	write_lock(&dev_priv->resource_lock);
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	if (id != -1)
		idr_remove(idr, id);
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}

void vmw_resource_unreference(struct vmw_resource **p_res)
{
	struct vmw_resource *res = *p_res;
	struct vmw_private *dev_priv = res->dev_priv;

	*p_res = NULL;
	write_lock(&dev_priv->resource_lock);
	kref_put(&res->kref, vmw_resource_release);
	write_unlock(&dev_priv->resource_lock);
}

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/**
 * vmw_resource_alloc_id - release a resource id to the id manager.
 *
 * @res: Pointer to the resource.
 *
 * Allocate the lowest free resource from the resource manager, and set
 * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
 */
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int vmw_resource_alloc_id(struct vmw_resource *res)
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{
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	struct vmw_private *dev_priv = res->dev_priv;
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	int ret;
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	struct idr *idr = &dev_priv->res_idr[res->func->res_type];
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	BUG_ON(res->id != -1);

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	idr_preload(GFP_KERNEL);
	write_lock(&dev_priv->resource_lock);
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	ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
	if (ret >= 0)
		res->id = ret;
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	write_unlock(&dev_priv->resource_lock);
	idr_preload_end();
	return ret < 0 ? ret : 0;
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}

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/**
 * vmw_resource_init - initialize a struct vmw_resource
 *
 * @dev_priv:       Pointer to a device private struct.
 * @res:            The struct vmw_resource to initialize.
 * @obj_type:       Resource object type.
 * @delay_id:       Boolean whether to defer device id allocation until
 *                  the first validation.
 * @res_free:       Resource destructor.
 * @func:           Resource function table.
 */
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int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
		      bool delay_id,
		      void (*res_free) (struct vmw_resource *res),
		      const struct vmw_res_func *func)
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{
	kref_init(&res->kref);
	res->hw_destroy = NULL;
	res->res_free = res_free;
	res->avail = false;
	res->dev_priv = dev_priv;
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	res->func = func;
	INIT_LIST_HEAD(&res->lru_head);
	INIT_LIST_HEAD(&res->mob_head);
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	INIT_LIST_HEAD(&res->binding_head);
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	res->id = -1;
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	res->backup = NULL;
	res->backup_offset = 0;
	res->backup_dirty = false;
	res->res_dirty = false;
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	if (delay_id)
		return 0;
	else
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		return vmw_resource_alloc_id(res);
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}

/**
 * vmw_resource_activate
 *
 * @res:        Pointer to the newly created resource
 * @hw_destroy: Destroy function. NULL if none.
 *
 * Activate a resource after the hardware has been made aware of it.
 * Set tye destroy function to @destroy. Typically this frees the
 * resource and destroys the hardware resources associated with it.
 * Activate basically means that the function vmw_resource_lookup will
 * find it.
 */
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void vmw_resource_activate(struct vmw_resource *res,
			   void (*hw_destroy) (struct vmw_resource *))
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{
	struct vmw_private *dev_priv = res->dev_priv;

	write_lock(&dev_priv->resource_lock);
	res->avail = true;
	res->hw_destroy = hw_destroy;
	write_unlock(&dev_priv->resource_lock);
}

struct vmw_resource *vmw_resource_lookup(struct vmw_private *dev_priv,
					 struct idr *idr, int id)
{
	struct vmw_resource *res;

	read_lock(&dev_priv->resource_lock);
	res = idr_find(idr, id);
	if (res && res->avail)
		kref_get(&res->kref);
	else
		res = NULL;
	read_unlock(&dev_priv->resource_lock);

	if (unlikely(res == NULL))
		return NULL;

	return res;
}

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/**
 * vmw_user_resource_lookup_handle - lookup a struct resource from a
 * TTM user-space handle and perform basic type checks
 *
 * @dev_priv:     Pointer to a device private struct
 * @tfile:        Pointer to a struct ttm_object_file identifying the caller
 * @handle:       The TTM user-space handle
 * @converter:    Pointer to an object describing the resource type
 * @p_res:        On successful return the location pointed to will contain
 *                a pointer to a refcounted struct vmw_resource.
 *
 * If the handle can't be found or is associated with an incorrect resource
 * type, -EINVAL will be returned.
 */
int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
				    struct ttm_object_file *tfile,
				    uint32_t handle,
				    const struct vmw_user_resource_conv
				    *converter,
				    struct vmw_resource **p_res)
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{
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	struct ttm_base_object *base;
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	struct vmw_resource *res;
	int ret = -EINVAL;
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	base = ttm_base_object_lookup(tfile, handle);
	if (unlikely(base == NULL))
		return -EINVAL;

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	if (unlikely(ttm_base_object_type(base) != converter->object_type))
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		goto out_bad_resource;
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	res = converter->base_obj_to_res(base);
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	read_lock(&dev_priv->resource_lock);
	if (!res->avail || res->res_free != converter->res_free) {
		read_unlock(&dev_priv->resource_lock);
		goto out_bad_resource;
	}
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	kref_get(&res->kref);
	read_unlock(&dev_priv->resource_lock);

	*p_res = res;
	ret = 0;

out_bad_resource:
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	ttm_base_object_unref(&base);
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	return ret;
}

/**
 * Helper function that looks either a surface or dmabuf.
 *
 * The pointer this pointed at by out_surf and out_buf needs to be null.
 */
int vmw_user_lookup_handle(struct vmw_private *dev_priv,
			   struct ttm_object_file *tfile,
			   uint32_t handle,
			   struct vmw_surface **out_surf,
			   struct vmw_dma_buffer **out_buf)
{
	struct vmw_resource *res;
	int ret;

	BUG_ON(*out_surf || *out_buf);

	ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
					      user_surface_converter,
					      &res);
	if (!ret) {
		*out_surf = vmw_res_to_srf(res);
		return 0;
	}

	*out_surf = NULL;
	ret = vmw_user_dmabuf_lookup(tfile, handle, out_buf);
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	return ret;
}

/**
 * Buffer management.
 */
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/**
 * vmw_dmabuf_acc_size - Calculate the pinned memory usage of buffers
 *
 * @dev_priv: Pointer to a struct vmw_private identifying the device.
 * @size: The requested buffer size.
 * @user: Whether this is an ordinary dma buffer or a user dma buffer.
 */
static size_t vmw_dmabuf_acc_size(struct vmw_private *dev_priv, size_t size,
				  bool user)
{
	static size_t struct_size, user_struct_size;
	size_t num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
	size_t page_array_size = ttm_round_pot(num_pages * sizeof(void *));

	if (unlikely(struct_size == 0)) {
		size_t backend_size = ttm_round_pot(vmw_tt_size);

		struct_size = backend_size +
			ttm_round_pot(sizeof(struct vmw_dma_buffer));
		user_struct_size = backend_size +
			ttm_round_pot(sizeof(struct vmw_user_dma_buffer));
	}

	if (dev_priv->map_mode == vmw_dma_alloc_coherent)
		page_array_size +=
			ttm_round_pot(num_pages * sizeof(dma_addr_t));

	return ((user) ? user_struct_size : struct_size) +
		page_array_size;
}

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void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo)
{
	struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);

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	kfree(vmw_bo);
}

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static void vmw_user_dmabuf_destroy(struct ttm_buffer_object *bo)
{
	struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);

	ttm_prime_object_kfree(vmw_user_bo, prime);
}

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int vmw_dmabuf_init(struct vmw_private *dev_priv,
		    struct vmw_dma_buffer *vmw_bo,
		    size_t size, struct ttm_placement *placement,
		    bool interruptible,
		    void (*bo_free) (struct ttm_buffer_object *bo))
{
	struct ttm_bo_device *bdev = &dev_priv->bdev;
	size_t acc_size;
	int ret;
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	bool user = (bo_free == &vmw_user_dmabuf_destroy);
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	BUG_ON(!bo_free && (!user && (bo_free != vmw_dmabuf_bo_free)));
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	acc_size = vmw_dmabuf_acc_size(dev_priv, size, user);
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	memset(vmw_bo, 0, sizeof(*vmw_bo));

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	INIT_LIST_HEAD(&vmw_bo->res_list);
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	ret = ttm_bo_init(bdev, &vmw_bo->base, size,
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			  ttm_bo_type_device, placement,
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			  0, interruptible,
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			  NULL, acc_size, NULL, NULL, bo_free);
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	return ret;
}

static void vmw_user_dmabuf_release(struct ttm_base_object **p_base)
{
	struct vmw_user_dma_buffer *vmw_user_bo;
	struct ttm_base_object *base = *p_base;
	struct ttm_buffer_object *bo;

	*p_base = NULL;

	if (unlikely(base == NULL))
		return;

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	vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
				   prime.base);
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	bo = &vmw_user_bo->dma.base;
	ttm_bo_unref(&bo);
}

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static void vmw_user_dmabuf_ref_obj_release(struct ttm_base_object *base,
					    enum ttm_ref_type ref_type)
{
	struct vmw_user_dma_buffer *user_bo;
	user_bo = container_of(base, struct vmw_user_dma_buffer, prime.base);

	switch (ref_type) {
	case TTM_REF_SYNCCPU_WRITE:
		ttm_bo_synccpu_write_release(&user_bo->dma.base);
		break;
	default:
		BUG();
	}
}

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/**
 * vmw_user_dmabuf_alloc - Allocate a user dma buffer
 *
 * @dev_priv: Pointer to a struct device private.
 * @tfile: Pointer to a struct ttm_object_file on which to register the user
 * object.
 * @size: Size of the dma buffer.
 * @shareable: Boolean whether the buffer is shareable with other open files.
 * @handle: Pointer to where the handle value should be assigned.
 * @p_dma_buf: Pointer to where the refcounted struct vmw_dma_buffer pointer
 * should be assigned.
 */
int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
			  struct ttm_object_file *tfile,
			  uint32_t size,
			  bool shareable,
			  uint32_t *handle,
			  struct vmw_dma_buffer **p_dma_buf)
{
	struct vmw_user_dma_buffer *user_bo;
	struct ttm_buffer_object *tmp;
	int ret;

	user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
	if (unlikely(user_bo == NULL)) {
		DRM_ERROR("Failed to allocate a buffer.\n");
		return -ENOMEM;
	}

	ret = vmw_dmabuf_init(dev_priv, &user_bo->dma, size,
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			      (dev_priv->has_mob) ?
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			      &vmw_mob_placement :
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			      &vmw_vram_sys_placement, true,
			      &vmw_user_dmabuf_destroy);
	if (unlikely(ret != 0))
		return ret;

	tmp = ttm_bo_reference(&user_bo->dma.base);
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	ret = ttm_prime_object_init(tfile,
				    size,
				    &user_bo->prime,
				    shareable,
				    ttm_buffer_type,
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				    &vmw_user_dmabuf_release,
				    &vmw_user_dmabuf_ref_obj_release);
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	if (unlikely(ret != 0)) {
		ttm_bo_unref(&tmp);
		goto out_no_base_object;
	}

	*p_dma_buf = &user_bo->dma;
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	*handle = user_bo->prime.base.hash.key;
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out_no_base_object:
	return ret;
}

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/**
 * vmw_user_dmabuf_verify_access - verify access permissions on this
 * buffer object.
 *
 * @bo: Pointer to the buffer object being accessed
 * @tfile: Identifying the caller.
 */
int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo,
				  struct ttm_object_file *tfile)
{
	struct vmw_user_dma_buffer *vmw_user_bo;

	if (unlikely(bo->destroy != vmw_user_dmabuf_destroy))
		return -EPERM;

	vmw_user_bo = vmw_user_dma_buffer(bo);
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	/* Check that the caller has opened the object. */
	if (likely(ttm_ref_object_exists(tfile, &vmw_user_bo->prime.base)))
		return 0;

	DRM_ERROR("Could not grant buffer access.\n");
	return -EPERM;
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}

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/**
 * vmw_user_dmabuf_synccpu_grab - Grab a struct vmw_user_dma_buffer for cpu
 * access, idling previous GPU operations on the buffer and optionally
 * blocking it for further command submissions.
 *
 * @user_bo: Pointer to the buffer object being grabbed for CPU access
 * @tfile: Identifying the caller.
 * @flags: Flags indicating how the grab should be performed.
 *
 * A blocking grab will be automatically released when @tfile is closed.
 */
static int vmw_user_dmabuf_synccpu_grab(struct vmw_user_dma_buffer *user_bo,
					struct ttm_object_file *tfile,
					uint32_t flags)
{
	struct ttm_buffer_object *bo = &user_bo->dma.base;
	bool existed;
	int ret;

	if (flags & drm_vmw_synccpu_allow_cs) {
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		bool nonblock = !!(flags & drm_vmw_synccpu_dontblock);
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		long lret;
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		if (nonblock)
			return reservation_object_test_signaled_rcu(bo->resv, true) ? 0 : -EBUSY;

		lret = reservation_object_wait_timeout_rcu(bo->resv, true, true, MAX_SCHEDULE_TIMEOUT);
		if (!lret)
			return -EBUSY;
		else if (lret < 0)
			return lret;
		return 0;
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	}

	ret = ttm_bo_synccpu_write_grab
		(bo, !!(flags & drm_vmw_synccpu_dontblock));
	if (unlikely(ret != 0))
		return ret;

	ret = ttm_ref_object_add(tfile, &user_bo->prime.base,
				 TTM_REF_SYNCCPU_WRITE, &existed);
	if (ret != 0 || existed)
		ttm_bo_synccpu_write_release(&user_bo->dma.base);

	return ret;
}

/**
 * vmw_user_dmabuf_synccpu_release - Release a previous grab for CPU access,
 * and unblock command submission on the buffer if blocked.
 *
 * @handle: Handle identifying the buffer object.
 * @tfile: Identifying the caller.
 * @flags: Flags indicating the type of release.
 */
static int vmw_user_dmabuf_synccpu_release(uint32_t handle,
					   struct ttm_object_file *tfile,
					   uint32_t flags)
{
	if (!(flags & drm_vmw_synccpu_allow_cs))
		return ttm_ref_object_base_unref(tfile, handle,
						 TTM_REF_SYNCCPU_WRITE);

	return 0;
}

/**
 * vmw_user_dmabuf_synccpu_release - ioctl function implementing the synccpu
 * functionality.
 *
 * @dev: Identifies the drm device.
 * @data: Pointer to the ioctl argument.
 * @file_priv: Identifies the caller.
 *
 * This function checks the ioctl arguments for validity and calls the
 * relevant synccpu functions.
 */
int vmw_user_dmabuf_synccpu_ioctl(struct drm_device *dev, void *data,
				  struct drm_file *file_priv)
{
	struct drm_vmw_synccpu_arg *arg =
		(struct drm_vmw_synccpu_arg *) data;
	struct vmw_dma_buffer *dma_buf;
	struct vmw_user_dma_buffer *user_bo;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	int ret;

	if ((arg->flags & (drm_vmw_synccpu_read | drm_vmw_synccpu_write)) == 0
	    || (arg->flags & ~(drm_vmw_synccpu_read | drm_vmw_synccpu_write |
			       drm_vmw_synccpu_dontblock |
			       drm_vmw_synccpu_allow_cs)) != 0) {
		DRM_ERROR("Illegal synccpu flags.\n");
		return -EINVAL;
	}

	switch (arg->op) {
	case drm_vmw_synccpu_grab:
		ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &dma_buf);
		if (unlikely(ret != 0))
			return ret;

		user_bo = container_of(dma_buf, struct vmw_user_dma_buffer,
				       dma);
		ret = vmw_user_dmabuf_synccpu_grab(user_bo, tfile, arg->flags);
		vmw_dmabuf_unreference(&dma_buf);
		if (unlikely(ret != 0 && ret != -ERESTARTSYS &&
			     ret != -EBUSY)) {
			DRM_ERROR("Failed synccpu grab on handle 0x%08x.\n",
				  (unsigned int) arg->handle);
			return ret;
		}
		break;
	case drm_vmw_synccpu_release:
		ret = vmw_user_dmabuf_synccpu_release(arg->handle, tfile,
						      arg->flags);
		if (unlikely(ret != 0)) {
			DRM_ERROR("Failed synccpu release on handle 0x%08x.\n",
				  (unsigned int) arg->handle);
			return ret;
		}
		break;
	default:
		DRM_ERROR("Invalid synccpu operation.\n");
		return -EINVAL;
	}

	return 0;
}

680 681 682 683 684 685 686 687
int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	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;
688 689
	struct vmw_dma_buffer *dma_buf;
	uint32_t handle;
690 691
	int ret;

692
	ret = ttm_read_lock(&dev_priv->reservation_sem, true);
693
	if (unlikely(ret != 0))
694 695
		return ret;

696 697
	ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
				    req->size, false, &handle, &dma_buf);
698
	if (unlikely(ret != 0))
699
		goto out_no_dmabuf;
700

701
	rep->handle = handle;
702
	rep->map_handle = drm_vma_node_offset_addr(&dma_buf->base.vma_node);
703 704 705 706
	rep->cur_gmr_id = handle;
	rep->cur_gmr_offset = 0;

	vmw_dmabuf_unreference(&dma_buf);
707

708
out_no_dmabuf:
709
	ttm_read_unlock(&dev_priv->reservation_sem);
710

711
	return ret;
712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737
}

int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct drm_vmw_unref_dmabuf_arg *arg =
	    (struct drm_vmw_unref_dmabuf_arg *)data;

	return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
					 arg->handle,
					 TTM_REF_USAGE);
}

int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
			   uint32_t handle, struct vmw_dma_buffer **out)
{
	struct vmw_user_dma_buffer *vmw_user_bo;
	struct ttm_base_object *base;

	base = ttm_base_object_lookup(tfile, handle);
	if (unlikely(base == NULL)) {
		printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
		       (unsigned long)handle);
		return -ESRCH;
	}

738
	if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
739 740 741 742 743 744
		ttm_base_object_unref(&base);
		printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
		       (unsigned long)handle);
		return -EINVAL;
	}

745 746
	vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
				   prime.base);
747 748 749 750 751 752 753
	(void)ttm_bo_reference(&vmw_user_bo->dma.base);
	ttm_base_object_unref(&base);
	*out = &vmw_user_bo->dma;

	return 0;
}

754
int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
755 756
			      struct vmw_dma_buffer *dma_buf,
			      uint32_t *handle)
757 758 759 760 761 762 763
{
	struct vmw_user_dma_buffer *user_bo;

	if (dma_buf->base.destroy != vmw_user_dmabuf_destroy)
		return -EINVAL;

	user_bo = container_of(dma_buf, struct vmw_user_dma_buffer, dma);
764 765

	*handle = user_bo->prime.base.hash.key;
766 767
	return ttm_ref_object_add(tfile, &user_bo->prime.base,
				  TTM_REF_USAGE, NULL);
768 769
}

770
/*
771
 * Stream management
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
 */

static void vmw_stream_destroy(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_stream *stream;
	int ret;

	DRM_INFO("%s: unref\n", __func__);
	stream = container_of(res, struct vmw_stream, res);

	ret = vmw_overlay_unref(dev_priv, stream->stream_id);
	WARN_ON(ret != 0);
}

static int vmw_stream_init(struct vmw_private *dev_priv,
			   struct vmw_stream *stream,
			   void (*res_free) (struct vmw_resource *res))
{
	struct vmw_resource *res = &stream->res;
	int ret;

794 795
	ret = vmw_resource_init(dev_priv, res, false, res_free,
				&vmw_stream_func);
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820

	if (unlikely(ret != 0)) {
		if (res_free == NULL)
			kfree(stream);
		else
			res_free(&stream->res);
		return ret;
	}

	ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
	if (ret) {
		vmw_resource_unreference(&res);
		return ret;
	}

	DRM_INFO("%s: claimed\n", __func__);

	vmw_resource_activate(&stream->res, vmw_stream_destroy);
	return 0;
}

static void vmw_user_stream_free(struct vmw_resource *res)
{
	struct vmw_user_stream *stream =
	    container_of(res, struct vmw_user_stream, stream.res);
821
	struct vmw_private *dev_priv = res->dev_priv;
822

823
	ttm_base_object_kfree(stream, base);
824 825
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
			    vmw_user_stream_size);
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
}

/**
 * This function is called when user space has no more references on the
 * base object. It releases the base-object's reference on the resource object.
 */

static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
{
	struct ttm_base_object *base = *p_base;
	struct vmw_user_stream *stream =
	    container_of(base, struct vmw_user_stream, base);
	struct vmw_resource *res = &stream->stream.res;

	*p_base = NULL;
	vmw_resource_unreference(&res);
}

int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_resource *res;
	struct vmw_user_stream *stream;
	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
852
	struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
853 854
	int ret = 0;

855 856

	res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
	if (unlikely(res == NULL))
		return -EINVAL;

	if (res->res_free != &vmw_user_stream_free) {
		ret = -EINVAL;
		goto out;
	}

	stream = container_of(res, struct vmw_user_stream, stream.res);
	if (stream->base.tfile != tfile) {
		ret = -EINVAL;
		goto out;
	}

	ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
out:
	vmw_resource_unreference(&res);
	return ret;
}

int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
881
	struct vmw_user_stream *stream;
882 883 884 885 886 887
	struct vmw_resource *res;
	struct vmw_resource *tmp;
	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	int ret;

888 889 890 891 892 893 894 895
	/*
	 * Approximate idr memory usage with 128 bytes. It will be limited
	 * by maximum number_of streams anyway?
	 */

	if (unlikely(vmw_user_stream_size == 0))
		vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;

896
	ret = ttm_read_lock(&dev_priv->reservation_sem, true);
897 898 899 900 901 902
	if (unlikely(ret != 0))
		return ret;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
				   vmw_user_stream_size,
				   false, true);
903
	ttm_read_unlock(&dev_priv->reservation_sem);
904 905 906 907 908
	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Out of graphics memory for stream"
				  " creation.\n");

909 910
		goto out_ret;
	}
911 912 913 914 915 916

	stream = kmalloc(sizeof(*stream), GFP_KERNEL);
	if (unlikely(stream == NULL)) {
		ttm_mem_global_free(vmw_mem_glob(dev_priv),
				    vmw_user_stream_size);
		ret = -ENOMEM;
917
		goto out_ret;
918
	}
919 920 921 922 923

	res = &stream->stream.res;
	stream->base.shareable = false;
	stream->base.tfile = NULL;

924 925 926 927
	/*
	 * From here on, the destructor takes over resource freeing.
	 */

928 929
	ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
	if (unlikely(ret != 0))
930
		goto out_ret;
931 932 933 934 935 936 937 938 939 940 941 942 943

	tmp = vmw_resource_reference(res);
	ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
				   &vmw_user_stream_base_release, NULL);

	if (unlikely(ret != 0)) {
		vmw_resource_unreference(&tmp);
		goto out_err;
	}

	arg->stream_id = res->id;
out_err:
	vmw_resource_unreference(&res);
944
out_ret:
945 946 947 948 949 950 951 952 953 954 955
	return ret;
}

int vmw_user_stream_lookup(struct vmw_private *dev_priv,
			   struct ttm_object_file *tfile,
			   uint32_t *inout_id, struct vmw_resource **out)
{
	struct vmw_user_stream *stream;
	struct vmw_resource *res;
	int ret;

956 957
	res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
				  *inout_id);
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978
	if (unlikely(res == NULL))
		return -EINVAL;

	if (res->res_free != &vmw_user_stream_free) {
		ret = -EINVAL;
		goto err_ref;
	}

	stream = container_of(res, struct vmw_user_stream, stream.res);
	if (stream->base.tfile != tfile) {
		ret = -EPERM;
		goto err_ref;
	}

	*inout_id = stream->stream.stream_id;
	*out = res;
	return 0;
err_ref:
	vmw_resource_unreference(&res);
	return ret;
}
D
Dave Airlie 已提交
979 980


981 982 983 984 985 986 987 988 989 990 991
/**
 * vmw_dumb_create - Create a dumb kms buffer
 *
 * @file_priv: Pointer to a struct drm_file identifying the caller.
 * @dev: Pointer to the drm device.
 * @args: Pointer to a struct drm_mode_create_dumb structure
 *
 * This is a driver callback for the core drm create_dumb functionality.
 * Note that this is very similar to the vmw_dmabuf_alloc ioctl, except
 * that the arguments have a different format.
 */
D
Dave Airlie 已提交
992 993 994 995 996
int vmw_dumb_create(struct drm_file *file_priv,
		    struct drm_device *dev,
		    struct drm_mode_create_dumb *args)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
997
	struct vmw_dma_buffer *dma_buf;
D
Dave Airlie 已提交
998 999 1000 1001 1002
	int ret;

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

1003
	ret = ttm_read_lock(&dev_priv->reservation_sem, true);
1004
	if (unlikely(ret != 0))
D
Dave Airlie 已提交
1005 1006
		return ret;

1007 1008 1009
	ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
				    args->size, false, &args->handle,
				    &dma_buf);
D
Dave Airlie 已提交
1010
	if (unlikely(ret != 0))
1011
		goto out_no_dmabuf;
D
Dave Airlie 已提交
1012

1013
	vmw_dmabuf_unreference(&dma_buf);
D
Dave Airlie 已提交
1014
out_no_dmabuf:
1015
	ttm_read_unlock(&dev_priv->reservation_sem);
D
Dave Airlie 已提交
1016 1017 1018
	return ret;
}

1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
/**
 * vmw_dumb_map_offset - Return the address space offset of a dumb buffer
 *
 * @file_priv: Pointer to a struct drm_file identifying the caller.
 * @dev: Pointer to the drm device.
 * @handle: Handle identifying the dumb buffer.
 * @offset: The address space offset returned.
 *
 * This is a driver callback for the core drm dumb_map_offset functionality.
 */
D
Dave Airlie 已提交
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
int vmw_dumb_map_offset(struct drm_file *file_priv,
			struct drm_device *dev, uint32_t handle,
			uint64_t *offset)
{
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_dma_buffer *out_buf;
	int ret;

	ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
	if (ret != 0)
		return -EINVAL;

1041
	*offset = drm_vma_node_offset_addr(&out_buf->base.vma_node);
D
Dave Airlie 已提交
1042 1043 1044 1045
	vmw_dmabuf_unreference(&out_buf);
	return 0;
}

1046 1047 1048 1049 1050 1051 1052 1053 1054
/**
 * vmw_dumb_destroy - Destroy a dumb boffer
 *
 * @file_priv: Pointer to a struct drm_file identifying the caller.
 * @dev: Pointer to the drm device.
 * @handle: Handle identifying the dumb buffer.
 *
 * This is a driver callback for the core drm dumb_destroy functionality.
 */
D
Dave Airlie 已提交
1055 1056 1057 1058 1059 1060 1061
int vmw_dumb_destroy(struct drm_file *file_priv,
		     struct drm_device *dev,
		     uint32_t handle)
{
	return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
					 handle, TTM_REF_USAGE);
}
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173

/**
 * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
 *
 * @res:            The resource for which to allocate a backup buffer.
 * @interruptible:  Whether any sleeps during allocation should be
 *                  performed while interruptible.
 */
static int vmw_resource_buf_alloc(struct vmw_resource *res,
				  bool interruptible)
{
	unsigned long size =
		(res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
	struct vmw_dma_buffer *backup;
	int ret;

	if (likely(res->backup)) {
		BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
		return 0;
	}

	backup = kzalloc(sizeof(*backup), GFP_KERNEL);
	if (unlikely(backup == NULL))
		return -ENOMEM;

	ret = vmw_dmabuf_init(res->dev_priv, backup, res->backup_size,
			      res->func->backup_placement,
			      interruptible,
			      &vmw_dmabuf_bo_free);
	if (unlikely(ret != 0))
		goto out_no_dmabuf;

	res->backup = backup;

out_no_dmabuf:
	return ret;
}

/**
 * vmw_resource_do_validate - Make a resource up-to-date and visible
 *                            to the device.
 *
 * @res:            The resource to make visible to the device.
 * @val_buf:        Information about a buffer possibly
 *                  containing backup data if a bind operation is needed.
 *
 * On hardware resource shortage, this function returns -EBUSY and
 * should be retried once resources have been freed up.
 */
static int vmw_resource_do_validate(struct vmw_resource *res,
				    struct ttm_validate_buffer *val_buf)
{
	int ret = 0;
	const struct vmw_res_func *func = res->func;

	if (unlikely(res->id == -1)) {
		ret = func->create(res);
		if (unlikely(ret != 0))
			return ret;
	}

	if (func->bind &&
	    ((func->needs_backup && list_empty(&res->mob_head) &&
	      val_buf->bo != NULL) ||
	     (!func->needs_backup && val_buf->bo != NULL))) {
		ret = func->bind(res, val_buf);
		if (unlikely(ret != 0))
			goto out_bind_failed;
		if (func->needs_backup)
			list_add_tail(&res->mob_head, &res->backup->res_list);
	}

	/*
	 * Only do this on write operations, and move to
	 * vmw_resource_unreserve if it can be called after
	 * backup buffers have been unreserved. Otherwise
	 * sort out locking.
	 */
	res->res_dirty = true;

	return 0;

out_bind_failed:
	func->destroy(res);

	return ret;
}

/**
 * vmw_resource_unreserve - Unreserve a resource previously reserved for
 * command submission.
 *
 * @res:               Pointer to the struct vmw_resource to unreserve.
 * @new_backup:        Pointer to new backup buffer if command submission
 *                     switched.
 * @new_backup_offset: New backup offset if @new_backup is !NULL.
 *
 * Currently unreserving a resource means putting it back on the device's
 * resource lru list, so that it can be evicted if necessary.
 */
void vmw_resource_unreserve(struct vmw_resource *res,
			    struct vmw_dma_buffer *new_backup,
			    unsigned long new_backup_offset)
{
	struct vmw_private *dev_priv = res->dev_priv;

	if (!list_empty(&res->lru_head))
		return;

	if (new_backup && new_backup != res->backup) {

		if (res->backup) {
1174
			lockdep_assert_held(&res->backup->base.resv->lock.base);
1175 1176 1177 1178 1179
			list_del_init(&res->mob_head);
			vmw_dmabuf_unreference(&res->backup);
		}

		res->backup = vmw_dmabuf_reference(new_backup);
1180
		lockdep_assert_held(&new_backup->base.resv->lock.base);
1181 1182 1183 1184 1185
		list_add_tail(&res->mob_head, &new_backup->res_list);
	}
	if (new_backup)
		res->backup_offset = new_backup_offset;

1186
	if (!res->func->may_evict || res->id == -1 || res->pin_count)
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
		return;

	write_lock(&dev_priv->resource_lock);
	list_add_tail(&res->lru_head,
		      &res->dev_priv->res_lru[res->func->res_type]);
	write_unlock(&dev_priv->resource_lock);
}

/**
 * vmw_resource_check_buffer - Check whether a backup buffer is needed
 *                             for a resource and in that case, allocate
 *                             one, reserve and validate it.
 *
 * @res:            The resource for which to allocate a backup buffer.
 * @interruptible:  Whether any sleeps during allocation should be
 *                  performed while interruptible.
 * @val_buf:        On successful return contains data about the
 *                  reserved and validated backup buffer.
 */
1206 1207 1208 1209
static int
vmw_resource_check_buffer(struct vmw_resource *res,
			  bool interruptible,
			  struct ttm_validate_buffer *val_buf)
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
{
	struct list_head val_list;
	bool backup_dirty = false;
	int ret;

	if (unlikely(res->backup == NULL)) {
		ret = vmw_resource_buf_alloc(res, interruptible);
		if (unlikely(ret != 0))
			return ret;
	}

	INIT_LIST_HEAD(&val_list);
	val_buf->bo = ttm_bo_reference(&res->backup->base);
1223
	val_buf->shared = false;
1224
	list_add_tail(&val_buf->head, &val_list);
1225
	ret = ttm_eu_reserve_buffers(NULL, &val_list, interruptible, NULL);
1226 1227 1228 1229 1230 1231 1232 1233 1234
	if (unlikely(ret != 0))
		goto out_no_reserve;

	if (res->func->needs_backup && list_empty(&res->mob_head))
		return 0;

	backup_dirty = res->backup_dirty;
	ret = ttm_bo_validate(&res->backup->base,
			      res->func->backup_placement,
1235
			      true, false);
1236 1237 1238 1239 1240 1241 1242

	if (unlikely(ret != 0))
		goto out_no_validate;

	return 0;

out_no_validate:
1243
	ttm_eu_backoff_reservation(NULL, &val_list);
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
out_no_reserve:
	ttm_bo_unref(&val_buf->bo);
	if (backup_dirty)
		vmw_dmabuf_unreference(&res->backup);

	return ret;
}

/**
 * vmw_resource_reserve - Reserve a resource for command submission
 *
 * @res:            The resource to reserve.
 *
 * This function takes the resource off the LRU list and make sure
 * a backup buffer is present for guest-backed resources. However,
 * the buffer may not be bound to the resource at this point.
 *
 */
1262 1263
int vmw_resource_reserve(struct vmw_resource *res, bool interruptible,
			 bool no_backup)
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273
{
	struct vmw_private *dev_priv = res->dev_priv;
	int ret;

	write_lock(&dev_priv->resource_lock);
	list_del_init(&res->lru_head);
	write_unlock(&dev_priv->resource_lock);

	if (res->func->needs_backup && res->backup == NULL &&
	    !no_backup) {
1274
		ret = vmw_resource_buf_alloc(res, interruptible);
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
		if (unlikely(ret != 0))
			return ret;
	}

	return 0;
}

/**
 * vmw_resource_backoff_reservation - Unreserve and unreference a
 *                                    backup buffer
 *.
 * @val_buf:        Backup buffer information.
 */
1288
static void
1289
vmw_resource_backoff_reservation(struct ttm_validate_buffer *val_buf)
1290 1291 1292 1293 1294 1295 1296 1297
{
	struct list_head val_list;

	if (likely(val_buf->bo == NULL))
		return;

	INIT_LIST_HEAD(&val_list);
	list_add_tail(&val_buf->head, &val_list);
1298
	ttm_eu_backoff_reservation(NULL, &val_list);
1299 1300 1301 1302 1303 1304 1305 1306
	ttm_bo_unref(&val_buf->bo);
}

/**
 * vmw_resource_do_evict - Evict a resource, and transfer its data
 *                         to a backup buffer.
 *
 * @res:            The resource to evict.
1307
 * @interruptible:  Whether to wait interruptible.
1308
 */
1309
int vmw_resource_do_evict(struct vmw_resource *res, bool interruptible)
1310 1311 1312 1313 1314 1315 1316 1317
{
	struct ttm_validate_buffer val_buf;
	const struct vmw_res_func *func = res->func;
	int ret;

	BUG_ON(!func->may_evict);

	val_buf.bo = NULL;
1318
	val_buf.shared = false;
1319
	ret = vmw_resource_check_buffer(res, interruptible, &val_buf);
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
	if (unlikely(ret != 0))
		return ret;

	if (unlikely(func->unbind != NULL &&
		     (!func->needs_backup || !list_empty(&res->mob_head)))) {
		ret = func->unbind(res, res->res_dirty, &val_buf);
		if (unlikely(ret != 0))
			goto out_no_unbind;
		list_del_init(&res->mob_head);
	}
	ret = func->destroy(res);
	res->backup_dirty = true;
	res->res_dirty = false;
out_no_unbind:
1334
	vmw_resource_backoff_reservation(&val_buf);
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357

	return ret;
}


/**
 * vmw_resource_validate - Make a resource up-to-date and visible
 *                         to the device.
 *
 * @res:            The resource to make visible to the device.
 *
 * On succesful return, any backup DMA buffer pointed to by @res->backup will
 * be reserved and validated.
 * On hardware resource shortage, this function will repeatedly evict
 * resources of the same type until the validation succeeds.
 */
int vmw_resource_validate(struct vmw_resource *res)
{
	int ret;
	struct vmw_resource *evict_res;
	struct vmw_private *dev_priv = res->dev_priv;
	struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
	struct ttm_validate_buffer val_buf;
1358
	unsigned err_count = 0;
1359 1360 1361 1362 1363

	if (likely(!res->func->may_evict))
		return 0;

	val_buf.bo = NULL;
1364
	val_buf.shared = false;
1365 1366 1367 1368 1369 1370 1371 1372 1373
	if (res->backup)
		val_buf.bo = &res->backup->base;
	do {
		ret = vmw_resource_do_validate(res, &val_buf);
		if (likely(ret != -EBUSY))
			break;

		write_lock(&dev_priv->resource_lock);
		if (list_empty(lru_list) || !res->func->may_evict) {
1374
			DRM_ERROR("Out of device device resources "
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
				  "for %s.\n", res->func->type_name);
			ret = -EBUSY;
			write_unlock(&dev_priv->resource_lock);
			break;
		}

		evict_res = vmw_resource_reference
			(list_first_entry(lru_list, struct vmw_resource,
					  lru_head));
		list_del_init(&evict_res->lru_head);

		write_unlock(&dev_priv->resource_lock);
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399

		ret = vmw_resource_do_evict(evict_res, true);
		if (unlikely(ret != 0)) {
			write_lock(&dev_priv->resource_lock);
			list_add_tail(&evict_res->lru_head, lru_list);
			write_unlock(&dev_priv->resource_lock);
			if (ret == -ERESTARTSYS ||
			    ++err_count > VMW_RES_EVICT_ERR_COUNT) {
				vmw_resource_unreference(&evict_res);
				goto out_no_validate;
			}
		}

1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431
		vmw_resource_unreference(&evict_res);
	} while (1);

	if (unlikely(ret != 0))
		goto out_no_validate;
	else if (!res->func->needs_backup && res->backup) {
		list_del_init(&res->mob_head);
		vmw_dmabuf_unreference(&res->backup);
	}

	return 0;

out_no_validate:
	return ret;
}

/**
 * vmw_fence_single_bo - Utility function to fence a single TTM buffer
 *                       object without unreserving it.
 *
 * @bo:             Pointer to the struct ttm_buffer_object to fence.
 * @fence:          Pointer to the fence. If NULL, this function will
 *                  insert a fence into the command stream..
 *
 * Contrary to the ttm_eu version of this function, it takes only
 * a single buffer object instead of a list, and it also doesn't
 * unreserve the buffer object, which needs to be done separately.
 */
void vmw_fence_single_bo(struct ttm_buffer_object *bo,
			 struct vmw_fence_obj *fence)
{
	struct ttm_bo_device *bdev = bo->bdev;
1432

1433 1434 1435
	struct vmw_private *dev_priv =
		container_of(bdev, struct vmw_private, bdev);

1436
	if (fence == NULL) {
1437
		vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
1438 1439
		reservation_object_add_excl_fence(bo->resv, &fence->base);
		fence_put(&fence->base);
1440
	} else
1441
		reservation_object_add_excl_fence(bo->resv, &fence->base);
1442 1443 1444 1445 1446 1447 1448 1449 1450
}

/**
 * vmw_resource_move_notify - TTM move_notify_callback
 *
 * @bo:             The TTM buffer object about to move.
 * @mem:            The truct ttm_mem_reg indicating to what memory
 *                  region the move is taking place.
 *
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461
 * Evicts the Guest Backed hardware resource if the backup
 * buffer is being moved out of MOB memory.
 * Note that this function should not race with the resource
 * validation code as long as it accesses only members of struct
 * resource that remain static while bo::res is !NULL and
 * while we have @bo reserved. struct resource::backup is *not* a
 * static member. The resource validation code will take care
 * to set @bo::res to NULL, while having @bo reserved when the
 * buffer is no longer bound to the resource, so @bo:res can be
 * used to determine whether there is a need to unbind and whether
 * it is safe to unbind.
1462 1463 1464 1465
 */
void vmw_resource_move_notify(struct ttm_buffer_object *bo,
			      struct ttm_mem_reg *mem)
{
1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
	struct vmw_dma_buffer *dma_buf;

	if (mem == NULL)
		return;

	if (bo->destroy != vmw_dmabuf_bo_free &&
	    bo->destroy != vmw_user_dmabuf_destroy)
		return;

	dma_buf = container_of(bo, struct vmw_dma_buffer, base);

	if (mem->mem_type != VMW_PL_MOB) {
		struct vmw_resource *res, *n;
		struct ttm_validate_buffer val_buf;

		val_buf.bo = bo;
1482
		val_buf.shared = false;
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496

		list_for_each_entry_safe(res, n, &dma_buf->res_list, mob_head) {

			if (unlikely(res->func->unbind == NULL))
				continue;

			(void) res->func->unbind(res, true, &val_buf);
			res->backup_dirty = true;
			res->res_dirty = false;
			list_del_init(&res->mob_head);
		}

		(void) ttm_bo_wait(bo, false, false, false);
	}
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515
}

/**
 * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
 *
 * @res:            The resource being queried.
 */
bool vmw_resource_needs_backup(const struct vmw_resource *res)
{
	return res->func->needs_backup;
}

/**
 * vmw_resource_evict_type - Evict all resources of a specific type
 *
 * @dev_priv:       Pointer to a device private struct
 * @type:           The resource type to evict
 *
 * To avoid thrashing starvation or as part of the hibernation sequence,
1516
 * try to evict all evictable resources of a specific type.
1517 1518 1519 1520 1521 1522
 */
static void vmw_resource_evict_type(struct vmw_private *dev_priv,
				    enum vmw_res_type type)
{
	struct list_head *lru_list = &dev_priv->res_lru[type];
	struct vmw_resource *evict_res;
1523 1524
	unsigned err_count = 0;
	int ret;
1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536

	do {
		write_lock(&dev_priv->resource_lock);

		if (list_empty(lru_list))
			goto out_unlock;

		evict_res = vmw_resource_reference(
			list_first_entry(lru_list, struct vmw_resource,
					 lru_head));
		list_del_init(&evict_res->lru_head);
		write_unlock(&dev_priv->resource_lock);
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548

		ret = vmw_resource_do_evict(evict_res, false);
		if (unlikely(ret != 0)) {
			write_lock(&dev_priv->resource_lock);
			list_add_tail(&evict_res->lru_head, lru_list);
			write_unlock(&dev_priv->resource_lock);
			if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
				vmw_resource_unreference(&evict_res);
				return;
			}
		}

1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
		vmw_resource_unreference(&evict_res);
	} while (1);

out_unlock:
	write_unlock(&dev_priv->resource_lock);
}

/**
 * vmw_resource_evict_all - Evict all evictable resources
 *
 * @dev_priv:       Pointer to a device private struct
 *
 * To avoid thrashing starvation or as part of the hibernation sequence,
 * evict all evictable resources. In particular this means that all
 * guest-backed resources that are registered with the device are
 * evicted and the OTable becomes clean.
 */
void vmw_resource_evict_all(struct vmw_private *dev_priv)
{
	enum vmw_res_type type;

	mutex_lock(&dev_priv->cmdbuf_mutex);

	for (type = 0; type < vmw_res_max; ++type)
		vmw_resource_evict_type(dev_priv, type);

	mutex_unlock(&dev_priv->cmdbuf_mutex);
}
1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587

/**
 * vmw_resource_pin - Add a pin reference on a resource
 *
 * @res: The resource to add a pin reference on
 *
 * This function adds a pin reference, and if needed validates the resource.
 * Having a pin reference means that the resource can never be evicted, and
 * its id will never change as long as there is a pin reference.
 * This function returns 0 on success and a negative error code on failure.
 */
1588
int vmw_resource_pin(struct vmw_resource *res, bool interruptible)
1589 1590 1591 1592
{
	struct vmw_private *dev_priv = res->dev_priv;
	int ret;

1593
	ttm_write_lock(&dev_priv->reservation_sem, interruptible);
1594
	mutex_lock(&dev_priv->cmdbuf_mutex);
1595
	ret = vmw_resource_reserve(res, interruptible, false);
1596 1597 1598 1599
	if (ret)
		goto out_no_reserve;

	if (res->pin_count == 0) {
1600
		struct vmw_dma_buffer *vbo = NULL;
1601 1602

		if (res->backup) {
1603 1604
			vbo = res->backup;

1605 1606
			ttm_bo_reserve(&vbo->base, interruptible, false, false,
				       NULL);
1607 1608 1609 1610
			if (!vbo->pin_count) {
				ret = ttm_bo_validate
					(&vbo->base,
					 res->func->backup_placement,
1611
					 interruptible, false);
1612 1613 1614 1615
				if (ret) {
					ttm_bo_unreserve(&vbo->base);
					goto out_no_validate;
				}
1616 1617 1618
			}

			/* Do we really need to pin the MOB as well? */
1619
			vmw_bo_pin_reserved(vbo, true);
1620 1621
		}
		ret = vmw_resource_validate(res);
1622 1623
		if (vbo)
			ttm_bo_unreserve(&vbo->base);
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653
		if (ret)
			goto out_no_validate;
	}
	res->pin_count++;

out_no_validate:
	vmw_resource_unreserve(res, NULL, 0UL);
out_no_reserve:
	mutex_unlock(&dev_priv->cmdbuf_mutex);
	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;
}

/**
 * vmw_resource_unpin - Remove a pin reference from a resource
 *
 * @res: The resource to remove a pin reference from
 *
 * Having a pin reference means that the resource can never be evicted, and
 * its id will never change as long as there is a pin reference.
 */
void vmw_resource_unpin(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	int ret;

	ttm_read_lock(&dev_priv->reservation_sem, false);
	mutex_lock(&dev_priv->cmdbuf_mutex);

1654
	ret = vmw_resource_reserve(res, false, true);
1655 1656 1657 1658
	WARN_ON(ret);

	WARN_ON(res->pin_count == 0);
	if (--res->pin_count == 0 && res->backup) {
1659
		struct vmw_dma_buffer *vbo = res->backup;
1660

1661 1662 1663
		ttm_bo_reserve(&vbo->base, false, false, false, NULL);
		vmw_bo_pin_reserved(vbo, false);
		ttm_bo_unreserve(&vbo->base);
1664 1665 1666 1667 1668 1669 1670
	}

	vmw_resource_unreserve(res, NULL, 0UL);

	mutex_unlock(&dev_priv->cmdbuf_mutex);
	ttm_read_unlock(&dev_priv->reservation_sem);
}