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

 *

 * Copyright © 2009-2012 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 "ttm/ttm_placement.h"

struct vmw_user_context {

	struct ttm_base_object base;

	struct vmw_resource res;

};

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 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

};

/**

 * Context management:

 */

static void vmw_hw_context_destroy(struct vmw_resource *res)

{

	struct vmw_private *dev_priv = res->dev_priv;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDestroyContext body;

	} *cmd;

	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 = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DESTROY);

	cmd->header.size = cpu_to_le32(sizeof(cmd->body));

	cmd->body.cid = cpu_to_le32(res->id);

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	vmw_3d_resource_dec(dev_priv, false);

}

static int vmw_context_init(struct vmw_private *dev_priv,

			    struct vmw_resource *res,

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

{

	int ret;

	struct {

		SVGA3dCmdHeader header;

		SVGA3dCmdDefineContext body;

	} *cmd;

	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 = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DEFINE);

	cmd->header.size = cpu_to_le32(sizeof(cmd->body));

	cmd->body.cid = cpu_to_le32(res->id);

	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	(void) vmw_3d_resource_inc(dev_priv, false);

	vmw_resource_activate(res, vmw_hw_context_destroy);

	return 0;

out_early:

	if (res_free == NULL)

		kfree(res);

	else

		res_free(res);

	return ret;

}

struct vmw_resource *vmw_context_alloc(struct vmw_private *dev_priv)

{

	struct vmw_resource *res = kmalloc(sizeof(*res), GFP_KERNEL);

	int ret;

	if (unlikely(res == NULL))

		return NULL;

	ret = vmw_context_init(dev_priv, res, NULL);

	return (ret == 0) ? res : NULL;

}

/**

 * 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;

//   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);

}

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

			     struct drm_file *file_priv)

{

	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;

	struct vmw_master *vmaster = vmw_master(file_priv->master);

	int ret;

	/*

	 * 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;

	ret = ttm_read_lock(&vmaster->lock, 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);

	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(&vmaster->lock);

	return ret;

}

#endif