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/**************************************************************************

 *

 * Copyright © 2009-2015 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"

#include "vmwgfx_resource_priv.h"

#include "vmwgfx_binding.h"

#include "ttm/ttm_placement.h"

struct vmw_user_context {

	struct ttm_base_object base;

	struct vmw_resource res;

	struct vmw_ctx_binding_state *cbs;

	struct vmw_cmdbuf_res_manager *man;

	struct vmw_resource *cotables[SVGA_COTABLE_DX10_MAX];

	spinlock_t cotable_lock;

	struct vmw_dma_buffer *dx_query_mob;

};

static void vmw_user_context_free(struct vmw_resource *res);

static struct vmw_resource *

vmw_user_context_base_to_res(struct ttm_base_object *base);

static int vmw_gb_context_create(struct vmw_resource *res);

static int vmw_gb_context_bind(struct vmw_resource *res,

			       struct ttm_validate_buffer *val_buf);

static int vmw_gb_context_unbind(struct vmw_resource *res,

				 bool readback,

				 struct ttm_validate_buffer *val_buf);

static int vmw_gb_context_destroy(struct vmw_resource *res);

static int vmw_dx_context_create(struct vmw_resource *res);

static int vmw_dx_context_bind(struct vmw_resource *res,

			       struct ttm_validate_buffer *val_buf);

static int vmw_dx_context_unbind(struct vmw_resource *res,

				 bool readback,

				 struct ttm_validate_buffer *val_buf);

static int vmw_dx_context_destroy(struct vmw_resource *res);

static uint64_t vmw_user_context_size;

static const struct vmw_user_resource_conv user_context_conv = {

	.object_type = VMW_RES_CONTEXT,

	.base_obj_to_res = vmw_user_context_base_to_res,

	.res_free = vmw_user_context_free

};

const struct vmw_user_resource_conv *user_context_converter =

	&user_context_conv;

static const struct vmw_res_func vmw_legacy_context_func = {

	.res_type = vmw_res_context,

	.needs_backup = false,

	.may_evict = false,

	.type_name = "legacy contexts",

	.backup_placement = NULL,

	.create = NULL,

	.destroy = NULL,

	.bind = NULL,

	.unbind = NULL

};

static const struct vmw_res_func vmw_gb_context_func = {

	.res_type = vmw_res_context,

	.needs_backup = true,

	.may_evict = true,

	.type_name = "guest backed contexts",

	.backup_placement = &vmw_mob_placement,

	.create = vmw_gb_context_create,

	.destroy = vmw_gb_context_destroy,

	.bind = vmw_gb_context_bind,

	.unbind = vmw_gb_context_unbind

};

static const struct vmw_res_func vmw_dx_context_func = {

	.res_type = vmw_res_dx_context,

	.needs_backup = true,

	.may_evict = true,

	.type_name = "dx contexts",

	.backup_placement = &vmw_mob_placement,

	.create = vmw_dx_context_create,

	.destroy = vmw_dx_context_destroy,

	.bind = vmw_dx_context_bind,

	.unbind = vmw_dx_context_unbind

};

/**

 * Context management:

 */

static void vmw_context_cotables_unref(struct vmw_user_context *uctx)

{

	struct vmw_resource *res;

	int i;

	for (i = 0; i < SVGA_COTABLE_DX10_MAX; ++i) {

		spin_lock(&uctx->cotable_lock);

		res = uctx->cotables[i];

		uctx->cotables[i] = NULL;

		spin_unlock(&uctx->cotable_lock);

		if (res)

			vmw_resource_unreference(&res);

	}

}

static void vmw_hw_context_destroy(struct vmw_resource *res)

{

	struct vmw_user_context *uctx =

		container_of(res, struct vmw_user_context, res);

	struct vmw_private *dev_priv = res->dev_priv;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDestroyContext body;

	} *cmd;

	if (res->func->destroy == vmw_gb_context_destroy ||

	    res->func->destroy == vmw_dx_context_destroy) {

		mutex_lock(&dev_priv->cmdbuf_mutex);

		vmw_cmdbuf_res_man_destroy(uctx->man);

		mutex_lock(&dev_priv->binding_mutex);

		vmw_binding_state_kill(uctx->cbs);

		(void) res->func->destroy(res);

		mutex_unlock(&dev_priv->binding_mutex);

		if (dev_priv->pinned_bo != NULL &&

		    !dev_priv->query_cid_valid)

			__vmw_execbuf_release_pinned_bo(dev_priv, NULL);

		mutex_unlock(&dev_priv->cmdbuf_mutex);

		vmw_context_cotables_unref(uctx);

		return;

	}

	vmw_execbuf_release_pinned_bo(dev_priv);

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for surface "

			  "destruction.\n");

		return;

	}

	cmd->header.id = SVGA_3D_CMD_CONTEXT_DESTROY;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	vmw_fifo_resource_dec(dev_priv);

}

static int vmw_gb_context_init(struct vmw_private *dev_priv,

			       bool dx,

			       struct vmw_resource *res,

			       void (*res_free)(struct vmw_resource *res))

{

	int ret, i;

	struct vmw_user_context *uctx =

		container_of(res, struct vmw_user_context, res);

	res->backup_size = (dx ? sizeof(SVGADXContextMobFormat) :

			    SVGA3D_CONTEXT_DATA_SIZE);

	ret = vmw_resource_init(dev_priv, res, true,

				res_free,

				dx ? &vmw_dx_context_func :

				&vmw_gb_context_func);

	if (unlikely(ret != 0))

		goto out_err;

	if (dev_priv->has_mob) {

		uctx->man = vmw_cmdbuf_res_man_create(dev_priv);

		if (IS_ERR(uctx->man)) {

			ret = PTR_ERR(uctx->man);

			uctx->man = NULL;

			goto out_err;

		}

	}

	uctx->cbs = vmw_binding_state_alloc(dev_priv);

	if (IS_ERR(uctx->cbs)) {

		ret = PTR_ERR(uctx->cbs);

		goto out_err;

	}

	spin_lock_init(&uctx->cotable_lock);

	if (dx) {

		for (i = 0; i < SVGA_COTABLE_DX10_MAX; ++i) {

			uctx->cotables[i] = vmw_cotable_alloc(dev_priv,

							      &uctx->res, i);

			if (unlikely(uctx->cotables[i] == NULL)) {

				ret = -ENOMEM;

				goto out_cotables;

			}

		}

	}

	vmw_resource_activate(res, vmw_hw_context_destroy);

	return 0;

out_cotables:

	vmw_context_cotables_unref(uctx);

out_err:

	if (res_free)

		res_free(res);

	else

		kfree(res);

	return ret;

}

static int vmw_context_init(struct vmw_private *dev_priv,

			    struct vmw_resource *res,

			    void (*res_free)(struct vmw_resource *res),

			    bool dx)

{

	int ret;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDefineContext body;

	} *cmd;

	if (dev_priv->has_mob)

		return vmw_gb_context_init(dev_priv, dx, res, res_free);

	ret = vmw_resource_init(dev_priv, res, false,

				res_free, &vmw_legacy_context_func);

	if (unlikely(ret != 0)) {

		DRM_ERROR("Failed to allocate a resource id.\n");

		goto out_early;

	}

	if (unlikely(res->id >= SVGA3D_MAX_CONTEXT_IDS)) {

		DRM_ERROR("Out of hw context ids.\n");

		vmw_resource_unreference(&res);

		return -ENOMEM;

	}

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Fifo reserve failed.\n");

		vmw_resource_unreference(&res);

		return -ENOMEM;

	}

	cmd->header.id = SVGA_3D_CMD_CONTEXT_DEFINE;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	vmw_fifo_resource_inc(dev_priv);

	vmw_resource_activate(res, vmw_hw_context_destroy);

	return 0;

out_early:

	if (res_free == NULL)

		kfree(res);

	else

		res_free(res);

	return ret;

}

/*

 * GB context.

 */

static int vmw_gb_context_create(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	int ret;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDefineGBContext body;

	} *cmd;

	if (likely(res->id != -1))

		return 0;

	ret = vmw_resource_alloc_id(res);

	if (unlikely(ret != 0)) {

		DRM_ERROR("Failed to allocate a context id.\n");

		goto out_no_id;

	}

	if (unlikely(res->id >= VMWGFX_NUM_GB_CONTEXT)) {

		ret = -EBUSY;

		goto out_no_fifo;

	}

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "creation.\n");

		ret = -ENOMEM;

		goto out_no_fifo;

	}

	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_CONTEXT;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	vmw_fifo_resource_inc(dev_priv);

	return 0;

out_no_fifo:

	vmw_resource_release_id(res);

out_no_id:

	return ret;

}

static int vmw_gb_context_bind(struct vmw_resource *res,

			       struct ttm_validate_buffer *val_buf)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdBindGBContext body;

	} *cmd;

	struct ttm_buffer_object *bo = val_buf->bo;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "binding.\n");

		return -ENOMEM;

	}

	cmd->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	cmd->body.mobid = bo->mem.start;

	cmd->body.validContents = res->backup_dirty;

	res->backup_dirty = false;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;

}

static int vmw_gb_context_unbind(struct vmw_resource *res,

				 bool readback,

				 struct ttm_validate_buffer *val_buf)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct ttm_buffer_object *bo = val_buf->bo;

	struct vmw_fence_obj *fence;

	struct vmw_user_context *uctx =

		container_of(res, struct vmw_user_context, res);

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdReadbackGBContext body;

	} *cmd1;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdBindGBContext body;

	} *cmd2;

	uint32_t submit_size;

	uint8_t *cmd;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	mutex_lock(&dev_priv->binding_mutex);

	vmw_binding_state_scrub(uctx->cbs);

	submit_size = sizeof(*cmd2) + (readback ? sizeof(*cmd1) : 0);

	cmd = vmw_fifo_reserve(dev_priv, submit_size);

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "unbinding.\n");

		mutex_unlock(&dev_priv->binding_mutex);

		return -ENOMEM;

	}

	cmd2 = (void *) cmd;

	if (readback) {

		cmd1 = (void *) cmd;

		cmd1->header.id = SVGA_3D_CMD_READBACK_GB_CONTEXT;

		cmd1->header.size = sizeof(cmd1->body);

		cmd1->body.cid = res->id;

		cmd2 = (void *) (&cmd1[1]);

	}

	cmd2->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;

	cmd2->header.size = sizeof(cmd2->body);

	cmd2->body.cid = res->id;

	cmd2->body.mobid = SVGA3D_INVALID_ID;

	vmw_fifo_commit(dev_priv, submit_size);

	mutex_unlock(&dev_priv->binding_mutex);

	/*

	 * Create a fence object and fence the backup buffer.

	 */

	(void) vmw_execbuf_fence_commands(NULL, dev_priv,

					  &fence, NULL);

	vmw_fence_single_bo(bo, fence);

	if (likely(fence != NULL))

		vmw_fence_obj_unreference(&fence);

	return 0;

}

static int vmw_gb_context_destroy(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDestroyGBContext body;

	} *cmd;

	if (likely(res->id == -1))

		return 0;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "destruction.\n");

		return -ENOMEM;

	}

	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_CONTEXT;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	if (dev_priv->query_cid == res->id)

		dev_priv->query_cid_valid = false;

	vmw_resource_release_id(res);

	vmw_fifo_resource_dec(dev_priv);

	return 0;

}

/*

 * DX context.

 */

static int vmw_dx_context_create(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	int ret;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDXDefineContext body;

	} *cmd;

	if (likely(res->id != -1))

		return 0;

	ret = vmw_resource_alloc_id(res);

	if (unlikely(ret != 0)) {

		DRM_ERROR("Failed to allocate a context id.\n");

		goto out_no_id;

	}

	if (unlikely(res->id >= VMWGFX_NUM_DXCONTEXT)) {

		ret = -EBUSY;

		goto out_no_fifo;

	}

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "creation.\n");

		ret = -ENOMEM;

		goto out_no_fifo;

	}

	cmd->header.id = SVGA_3D_CMD_DX_DEFINE_CONTEXT;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	vmw_fifo_resource_inc(dev_priv);

	return 0;

out_no_fifo:

	vmw_resource_release_id(res);

out_no_id:

	return ret;

}

static int vmw_dx_context_bind(struct vmw_resource *res,

			       struct ttm_validate_buffer *val_buf)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDXBindContext body;

	} *cmd;

	struct ttm_buffer_object *bo = val_buf->bo;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "binding.\n");

		return -ENOMEM;

	}

	cmd->header.id = SVGA_3D_CMD_DX_BIND_CONTEXT;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	cmd->body.mobid = bo->mem.start;

	cmd->body.validContents = res->backup_dirty;

	res->backup_dirty = false;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;

}

/**

 * vmw_dx_context_scrub_cotables - Scrub all bindings and

 * cotables from a context

 *

 * @ctx: Pointer to the context resource

 * @readback: Whether to save the otable contents on scrubbing.

 *

 * COtables must be unbound before their context, but unbinding requires

 * the backup buffer being reserved, whereas scrubbing does not.

 * This function scrubs all cotables of a context, potentially reading back

 * the contents into their backup buffers. However, scrubbing cotables

 * also makes the device context invalid, so scrub all bindings first so

 * that doesn't have to be done later with an invalid context.

 */

void vmw_dx_context_scrub_cotables(struct vmw_resource *ctx,

				   bool readback)

{

	struct vmw_user_context *uctx =

		container_of(ctx, struct vmw_user_context, res);

	int i;

	vmw_binding_state_scrub(uctx->cbs);

	for (i = 0; i < SVGA_COTABLE_DX10_MAX; ++i) {

		struct vmw_resource *res;

		/* Avoid racing with ongoing cotable destruction. */

		spin_lock(&uctx->cotable_lock);

		res = uctx->cotables[vmw_cotable_scrub_order[i]];

		if (res)

			res = vmw_resource_reference_unless_doomed(res);

		spin_unlock(&uctx->cotable_lock);

		if (!res)

			continue;

		WARN_ON(vmw_cotable_scrub(res, readback));

		vmw_resource_unreference(&res);

	}

}

static int vmw_dx_context_unbind(struct vmw_resource *res,

				 bool readback,

				 struct ttm_validate_buffer *val_buf)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct ttm_buffer_object *bo = val_buf->bo;

	struct vmw_fence_obj *fence;

	struct vmw_user_context *uctx =

		container_of(res, struct vmw_user_context, res);

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDXReadbackContext body;

	} *cmd1;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDXBindContext body;

	} *cmd2;

	uint32_t submit_size;

	uint8_t *cmd;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	mutex_lock(&dev_priv->binding_mutex);

	vmw_dx_context_scrub_cotables(res, readback);

	if (uctx->dx_query_mob && uctx->dx_query_mob->dx_query_ctx &&

	    readback) {

		WARN_ON(uctx->dx_query_mob->dx_query_ctx != res);

		if (vmw_query_readback_all(uctx->dx_query_mob))

			DRM_ERROR("Failed to read back query states\n");

	}

	submit_size = sizeof(*cmd2) + (readback ? sizeof(*cmd1) : 0);

	cmd = vmw_fifo_reserve(dev_priv, submit_size);

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "unbinding.\n");

		mutex_unlock(&dev_priv->binding_mutex);

		return -ENOMEM;

	}

	cmd2 = (void *) cmd;

	if (readback) {

		cmd1 = (void *) cmd;

		cmd1->header.id = SVGA_3D_CMD_DX_READBACK_CONTEXT;

		cmd1->header.size = sizeof(cmd1->body);

		cmd1->body.cid = res->id;

		cmd2 = (void *) (&cmd1[1]);

	}

	cmd2->header.id = SVGA_3D_CMD_DX_BIND_CONTEXT;

	cmd2->header.size = sizeof(cmd2->body);

	cmd2->body.cid = res->id;

	cmd2->body.mobid = SVGA3D_INVALID_ID;

	vmw_fifo_commit(dev_priv, submit_size);

	mutex_unlock(&dev_priv->binding_mutex);

	/*

	 * Create a fence object and fence the backup buffer.

	 */

	(void) vmw_execbuf_fence_commands(NULL, dev_priv,

					  &fence, NULL);

	vmw_fence_single_bo(bo, fence);

	if (likely(fence != NULL))

		vmw_fence_obj_unreference(&fence);

	return 0;

}

static int vmw_dx_context_destroy(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDXDestroyContext body;

	} *cmd;

	if (likely(res->id == -1))

		return 0;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

	if (unlikely(cmd == NULL)) {

		DRM_ERROR("Failed reserving FIFO space for context "

			  "destruction.\n");

		return -ENOMEM;

	}

	cmd->header.id = SVGA_3D_CMD_DX_DESTROY_CONTEXT;

	cmd->header.size = sizeof(cmd->body);

	cmd->body.cid = res->id;

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	if (dev_priv->query_cid == res->id)

		dev_priv->query_cid_valid = false;

	vmw_resource_release_id(res);

	vmw_fifo_resource_dec(dev_priv);

	return 0;

}

/**

 * User-space context management:

 */

static struct vmw_resource *

vmw_user_context_base_to_res(struct ttm_base_object *base)

{

	return &(container_of(base, struct vmw_user_context, base)->res);

}

static void vmw_user_context_free(struct vmw_resource *res)

{

	struct vmw_user_context *ctx =

	    container_of(res, struct vmw_user_context, res);

	struct vmw_private *dev_priv = res->dev_priv;

	if (ctx->cbs)

		vmw_binding_state_free(ctx->cbs);

	(void) vmw_context_bind_dx_query(res, NULL);

	ttm_base_object_kfree(ctx, base);

	ttm_mem_global_free(vmw_mem_glob(dev_priv),

			    vmw_user_context_size);

}

/**

 * 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_context_base_release(struct ttm_base_object **p_base)

{

	struct ttm_base_object *base = *p_base;

	struct vmw_user_context *ctx =

	    container_of(base, struct vmw_user_context, base);

	struct vmw_resource *res = &ctx->res;

	*p_base = NULL;

	vmw_resource_unreference(&res);

}

#if 0

int vmw_context_destroy_ioctl(struct drm_device *dev, void *data,

			      struct drm_file *file_priv)

{

	struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;

	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

	return ttm_ref_object_base_unref(tfile, arg->cid, TTM_REF_USAGE);

}

static int vmw_context_define(struct drm_device *dev, void *data,

			      struct drm_file *file_priv, bool dx)

{

	struct vmw_private *dev_priv = vmw_priv(dev);

	struct vmw_user_context *ctx;

	struct vmw_resource *res;

	struct vmw_resource *tmp;

	struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;

	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

	int ret;

	if (!dev_priv->has_dx && dx) {

		DRM_ERROR("DX contexts not supported by device.\n");

		return -EINVAL;

	}

	/*

	 * Approximate idr memory usage with 128 bytes. It will be limited

	 * by maximum number_of contexts anyway.

	 */

	if (unlikely(vmw_user_context_size == 0))

		vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) + 128 +

		  ((dev_priv->has_mob) ? vmw_cmdbuf_res_man_size() : 0);

	ret = ttm_read_lock(&dev_priv->reservation_sem, true);

	if (unlikely(ret != 0))

		return ret;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),

				   vmw_user_context_size,

				   false, true);

	if (unlikely(ret != 0)) {

		if (ret != -ERESTARTSYS)

			DRM_ERROR("Out of graphics memory for context"

				  " creation.\n");

		goto out_unlock;

	}

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);

	if (unlikely(ctx == NULL)) {

		ttm_mem_global_free(vmw_mem_glob(dev_priv),

				    vmw_user_context_size);

		ret = -ENOMEM;

		goto out_unlock;

	}

	res = &ctx->res;

	ctx->base.shareable = false;

	ctx->base.tfile = NULL;

	/*

	 * From here on, the destructor takes over resource freeing.

	 */

	ret = vmw_context_init(dev_priv, res, vmw_user_context_free, dx);

	if (unlikely(ret != 0))

		goto out_unlock;

	tmp = vmw_resource_reference(&ctx->res);

	ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,

				   &vmw_user_context_base_release, NULL);

	if (unlikely(ret != 0)) {

		vmw_resource_unreference(&tmp);

		goto out_err;

	}

	arg->cid = ctx->base.hash.key;

out_err:

	vmw_resource_unreference(&res);

out_unlock:

	ttm_read_unlock(&dev_priv->reservation_sem);

	return ret;

}

#endif

/**

 * vmw_context_binding_list - Return a list of context bindings

 *

 * @ctx: The context resource

 *

 * Returns the current list of bindings of the given context. Note that

 * this list becomes stale as soon as the dev_priv::binding_mutex is unlocked.

 */

struct list_head *vmw_context_binding_list(struct vmw_resource *ctx)

{

	struct vmw_user_context *uctx =

		container_of(ctx, struct vmw_user_context, res);

	return vmw_binding_state_list(uctx->cbs);

}

struct vmw_cmdbuf_res_manager *vmw_context_res_man(struct vmw_resource *ctx)

{

	return container_of(ctx, struct vmw_user_context, res)->man;

}

struct vmw_resource *vmw_context_cotable(struct vmw_resource *ctx,

					 SVGACOTableType cotable_type)

{

	if (cotable_type >= SVGA_COTABLE_DX10_MAX)

		return ERR_PTR(-EINVAL);

	return vmw_resource_reference

		(container_of(ctx, struct vmw_user_context, res)->

		 cotables[cotable_type]);

}

/**

 * vmw_context_binding_state -

 * Return a pointer to a context binding state structure

 *

 * @ctx: The context resource

 *

 * Returns the current state of bindings of the given context. Note that

 * this state becomes stale as soon as the dev_priv::binding_mutex is unlocked.

 */

struct vmw_ctx_binding_state *

vmw_context_binding_state(struct vmw_resource *ctx)

{

	return container_of(ctx, struct vmw_user_context, res)->cbs;

}

/**

 * vmw_context_bind_dx_query -

 * Sets query MOB for the context.  If @mob is NULL, then this function will

 * remove the association between the MOB and the context.  This function

 * assumes the binding_mutex is held.

 *

 * @ctx_res: The context resource

 * @mob: a reference to the query MOB

 *

 * Returns -EINVAL if a MOB has already been set and does not match the one

 * specified in the parameter.  0 otherwise.

 */

int vmw_context_bind_dx_query(struct vmw_resource *ctx_res,

			      struct vmw_dma_buffer *mob)

{

	struct vmw_user_context *uctx =

		container_of(ctx_res, struct vmw_user_context, res);

	if (mob == NULL) {

		if (uctx->dx_query_mob) {

			uctx->dx_query_mob->dx_query_ctx = NULL;

			vmw_dmabuf_unreference(&uctx->dx_query_mob);

			uctx->dx_query_mob = NULL;

		}

		return 0;

	}

	/* Can only have one MOB per context for queries */

	if (uctx->dx_query_mob && uctx->dx_query_mob != mob)

		return -EINVAL;

	mob->dx_query_ctx  = ctx_res;

	if (!uctx->dx_query_mob)

		uctx->dx_query_mob = vmw_dmabuf_reference(mob);

	return 0;

}

/**

 * vmw_context_get_dx_query_mob - Returns non-counted reference to DX query mob

 *

 * @ctx_res: The context resource

 */

struct vmw_dma_buffer *

vmw_context_get_dx_query_mob(struct vmw_resource *ctx_res)

{

	struct vmw_user_context *uctx =

		container_of(ctx_res, struct vmw_user_context, res);

	return uctx->dx_query_mob;

}