// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright © 2018-2019 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 <drm/ttm/ttm_placement.h>

#include "vmwgfx_drv.h"
#include "vmwgfx_resource_priv.h"
#include "vmwgfx_binding.h"

/**
 * struct vmw_dx_streamoutput - Streamoutput resource metadata.
 * @res: Base resource struct.
 * @ctx: Non-refcounted context to which @res belong.
 * @cotable: Refcounted cotable holding this Streamoutput.
 * @cotable_head: List head for cotable-so_res list.
 * @id: User-space provided identifier.
 * @size: User-space provided mob size.
 * @committed: Whether streamoutput is actually created or pending creation.
 */
struct vmw_dx_streamoutput {
        struct vmw_resource res;
        struct vmw_resource *ctx;
        struct vmw_resource *cotable;
        struct list_head cotable_head;
        u32 id;
        u32 size;
        bool committed;
};

static int vmw_dx_streamoutput_create(struct vmw_resource *res);
static int vmw_dx_streamoutput_bind(struct vmw_resource *res,
                                    struct ttm_validate_buffer *val_buf);
static int vmw_dx_streamoutput_unbind(struct vmw_resource *res, bool readback,
                                      struct ttm_validate_buffer *val_buf);
static void vmw_dx_streamoutput_commit_notify(struct vmw_resource *res,
                                              enum vmw_cmdbuf_res_state state);

static size_t vmw_streamoutput_size;

static const struct vmw_res_func vmw_dx_streamoutput_func = {
        .res_type = vmw_res_streamoutput,
        .needs_backup = true,
        .may_evict = false,
        .type_name = "DX streamoutput",
        .backup_placement = &vmw_mob_placement,
        .create = vmw_dx_streamoutput_create,
        .destroy = NULL, /* Command buffer managed resource. */
        .bind = vmw_dx_streamoutput_bind,
        .unbind = vmw_dx_streamoutput_unbind,
        .commit_notify = vmw_dx_streamoutput_commit_notify,
};

static inline struct vmw_dx_streamoutput *
vmw_res_to_dx_streamoutput(struct vmw_resource *res)
{
        return container_of(res, struct vmw_dx_streamoutput, res);
}

/**
 * vmw_dx_streamoutput_unscrub - Reattach the MOB to streamoutput.
 * @res: The streamoutput resource.
 *
 * Return: 0 on success, negative error code on failure.
 */
static int vmw_dx_streamoutput_unscrub(struct vmw_resource *res)
{
        struct vmw_dx_streamoutput *so = vmw_res_to_dx_streamoutput(res);
        struct vmw_private *dev_priv = res->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXBindStreamOutput body;
        } *cmd;

        if (!list_empty(&so->cotable_head) || !so->committed )
                return 0;

        cmd = VMW_CMD_CTX_RESERVE(dev_priv, sizeof(*cmd), so->ctx->id);
        if (!cmd)
                return -ENOMEM;

        cmd->header.id = SVGA_3D_CMD_DX_BIND_STREAMOUTPUT;
        cmd->header.size = sizeof(cmd->body);
        cmd->body.soid = so->id;
        cmd->body.mobid = res->backup->base.mem.start;
        cmd->body.offsetInBytes = res->backup_offset;
        cmd->body.sizeInBytes = so->size;
        vmw_cmd_commit(dev_priv, sizeof(*cmd));

        vmw_cotable_add_resource(so->cotable, &so->cotable_head);

        return 0;
}

static int vmw_dx_streamoutput_create(struct vmw_resource *res)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct vmw_dx_streamoutput *so = vmw_res_to_dx_streamoutput(res);
        int ret = 0;

        WARN_ON_ONCE(!so->committed);

        if (vmw_resource_mob_attached(res)) {
                mutex_lock(&dev_priv->binding_mutex);
                ret = vmw_dx_streamoutput_unscrub(res);
                mutex_unlock(&dev_priv->binding_mutex);
        }

        res->id = so->id;

        return ret;
}

static int vmw_dx_streamoutput_bind(struct vmw_resource *res,
                                    struct ttm_validate_buffer *val_buf)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct ttm_buffer_object *bo = val_buf->bo;
        int ret;

        if (WARN_ON(bo->mem.mem_type != VMW_PL_MOB))
                return -EINVAL;

        mutex_lock(&dev_priv->binding_mutex);
        ret = vmw_dx_streamoutput_unscrub(res);
        mutex_unlock(&dev_priv->binding_mutex);

        return ret;
}

/**
 * vmw_dx_streamoutput_scrub - Unbind the MOB from streamoutput.
 * @res: The streamoutput resource.
 *
 * Return: 0 on success, negative error code on failure.
 */
static int vmw_dx_streamoutput_scrub(struct vmw_resource *res)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct vmw_dx_streamoutput *so = vmw_res_to_dx_streamoutput(res);
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXBindStreamOutput body;
        } *cmd;

        if (list_empty(&so->cotable_head))
                return 0;

        WARN_ON_ONCE(!so->committed);

        cmd = VMW_CMD_CTX_RESERVE(dev_priv, sizeof(*cmd), so->ctx->id);
        if (!cmd)
                return -ENOMEM;

        cmd->header.id = SVGA_3D_CMD_DX_BIND_STREAMOUTPUT;
        cmd->header.size = sizeof(cmd->body);
        cmd->body.soid = res->id;
        cmd->body.mobid = SVGA3D_INVALID_ID;
        cmd->body.offsetInBytes = 0;
        cmd->body.sizeInBytes = so->size;
        vmw_cmd_commit(dev_priv, sizeof(*cmd));

        res->id = -1;
        list_del_init(&so->cotable_head);

        return 0;
}

static int vmw_dx_streamoutput_unbind(struct vmw_resource *res, bool readback,
                                      struct ttm_validate_buffer *val_buf)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct vmw_fence_obj *fence;
        int ret;

        if (WARN_ON(res->backup->base.mem.mem_type != VMW_PL_MOB))
                return -EINVAL;

        mutex_lock(&dev_priv->binding_mutex);
        ret = vmw_dx_streamoutput_scrub(res);
        mutex_unlock(&dev_priv->binding_mutex);

        if (ret)
                return ret;

        (void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
        vmw_bo_fence_single(val_buf->bo, fence);

        if (fence != NULL)
                vmw_fence_obj_unreference(&fence);

        return 0;
}

static void vmw_dx_streamoutput_commit_notify(struct vmw_resource *res,
                                           enum vmw_cmdbuf_res_state state)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct vmw_dx_streamoutput *so = vmw_res_to_dx_streamoutput(res);

        if (state == VMW_CMDBUF_RES_ADD) {
                mutex_lock(&dev_priv->binding_mutex);
                vmw_cotable_add_resource(so->cotable, &so->cotable_head);
                so->committed = true;
                res->id = so->id;
                mutex_unlock(&dev_priv->binding_mutex);
        } else {
                mutex_lock(&dev_priv->binding_mutex);
                list_del_init(&so->cotable_head);
                so->committed = false;
                res->id = -1;
                mutex_unlock(&dev_priv->binding_mutex);
        }
}

/**
 * vmw_dx_streamoutput_lookup - Do a streamoutput resource lookup by user key.
 * @man: Command buffer managed resource manager for current context.
 * @user_key: User-space identifier for lookup.
 *
 * Return: Valid refcounted vmw_resource on success, error pointer on failure.
 */
struct vmw_resource *
vmw_dx_streamoutput_lookup(struct vmw_cmdbuf_res_manager *man,
                           u32 user_key)
{
        return vmw_cmdbuf_res_lookup(man, vmw_cmdbuf_res_streamoutput,
                                     user_key);
}

static void vmw_dx_streamoutput_res_free(struct vmw_resource *res)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct vmw_dx_streamoutput *so = vmw_res_to_dx_streamoutput(res);

        vmw_resource_unreference(&so->cotable);
        kfree(so);
        ttm_mem_global_free(vmw_mem_glob(dev_priv), vmw_streamoutput_size);
}

static void vmw_dx_streamoutput_hw_destroy(struct vmw_resource *res)
{
        /* Destroyed by user-space cmd buf or as part of context takedown. */
        res->id = -1;
}

/**
 * vmw_dx_streamoutput_add - Add a streamoutput as a cmd buf managed resource.
 * @man: Command buffer managed resource manager for current context.
 * @ctx: Pointer to context resource.
 * @user_key: The identifier for this streamoutput.
 * @list: The list of staged command buffer managed resources.
 *
 * Return: 0 on success, negative error code on failure.
 */
int vmw_dx_streamoutput_add(struct vmw_cmdbuf_res_manager *man,
                            struct vmw_resource *ctx, u32 user_key,
                            struct list_head *list)
{
        struct vmw_dx_streamoutput *so;
        struct vmw_resource *res;
        struct vmw_private *dev_priv = ctx->dev_priv;
        struct ttm_operation_ctx ttm_opt_ctx = {
                .interruptible = true,
                .no_wait_gpu = false
        };
        int ret;

        if (!vmw_streamoutput_size)
                vmw_streamoutput_size = ttm_round_pot(sizeof(*so));

        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
                                   vmw_streamoutput_size, &ttm_opt_ctx);
        if (ret) {
                if (ret != -ERESTARTSYS)
                        DRM_ERROR("Out of graphics memory for streamout.\n");
                return ret;
        }

        so = kmalloc(sizeof(*so), GFP_KERNEL);
        if (!so) {
                ttm_mem_global_free(vmw_mem_glob(dev_priv),
                                    vmw_streamoutput_size);
                return -ENOMEM;
        }

        res = &so->res;
        so->ctx = ctx;
        so->cotable = vmw_resource_reference
                (vmw_context_cotable(ctx, SVGA_COTABLE_STREAMOUTPUT));
        so->id = user_key;
        so->committed = false;
        INIT_LIST_HEAD(&so->cotable_head);
        ret = vmw_resource_init(dev_priv, res, true,
                                vmw_dx_streamoutput_res_free,
                                &vmw_dx_streamoutput_func);
        if (ret)
                goto out_resource_init;

        ret = vmw_cmdbuf_res_add(man, vmw_cmdbuf_res_streamoutput, user_key,
                                 res, list);
        if (ret)
                goto out_resource_init;

        res->id = so->id;
        res->hw_destroy = vmw_dx_streamoutput_hw_destroy;

out_resource_init:
        vmw_resource_unreference(&res);

        return ret;
}

/**
 * vmw_dx_streamoutput_set_size - Sets streamoutput mob size in res struct.
 * @res: The streamoutput res for which need to set size.
 * @size: The size provided by user-space to set.
 */
void vmw_dx_streamoutput_set_size(struct vmw_resource *res, u32 size)
{
        struct vmw_dx_streamoutput *so = vmw_res_to_dx_streamoutput(res);

        so->size = size;
}

/**
 * vmw_dx_streamoutput_remove - Stage streamoutput for removal.
 * @man: Command buffer managed resource manager for current context.
 * @user_key: The identifier for this streamoutput.
 * @list: The list of staged command buffer managed resources.
 *
 * Return: 0 on success, negative error code on failure.
 */
int vmw_dx_streamoutput_remove(struct vmw_cmdbuf_res_manager *man,
                               u32 user_key,
                               struct list_head *list)
{
        struct vmw_resource *r;

        return vmw_cmdbuf_res_remove(man, vmw_cmdbuf_res_streamoutput,
                                     (u32)user_key, list, &r);
}

/**
 * vmw_dx_streamoutput_cotable_list_scrub - cotable unbind_func callback.
 * @dev_priv: Device private.
 * @list: The list of cotable resources.
 * @readback: Whether the call was part of a readback unbind.
 */
void vmw_dx_streamoutput_cotable_list_scrub(struct vmw_private *dev_priv,
                                            struct list_head *list,
                                            bool readback)
{
        struct vmw_dx_streamoutput *entry, *next;

        lockdep_assert_held_once(&dev_priv->binding_mutex);

        list_for_each_entry_safe(entry, next, list, cotable_head) {
                WARN_ON(vmw_dx_streamoutput_scrub(&entry->res));
                if (!readback)
                        entry->committed =false;
        }
}