/*
 * Copyright (c) 2011 Intel Corporation. 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 PRECISION INSIGHT 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.
 *
 * Authors:
 *    Binglin Chen <binglin.chen@intel.com>
 *
 */

#include "vsp_VPP.h"
#include "vsp_cmdbuf.h"
#include "psb_drv_debug.h"

#define CMD_SIZE              (0x3000)
#define LLDMA_SIZE            (0x2000)
#define RELOC_SIZE            (0x3000)

static int
vspDRMCmdBuf(int fd, int ioctl_offset, psb_buffer_p *buffer_list, int buffer_count, unsigned cmdBufHandle,
	     unsigned cmdBufOffset, unsigned cmdBufSize,
	     unsigned relocBufHandle, unsigned relocBufOffset,
	     unsigned numRelocs, int damage,
	     unsigned engine, unsigned fence_flags, struct psb_ttm_fence_rep *fence_rep);

/*
 * Create command buffer
 */
VAStatus vsp_cmdbuf_create(
	object_context_p obj_context,
	psb_driver_data_p driver_data,
	vsp_cmdbuf_p cmdbuf)
{
	VAStatus vaStatus = VA_STATUS_SUCCESS;
	unsigned int size = CMD_SIZE + RELOC_SIZE;
	context_VPP_p ctx = (context_VPP_p) obj_context->format_data;

	cmdbuf->size = 0;
	cmdbuf->cmd_base = NULL;
	cmdbuf->cmd_idx = NULL;
	cmdbuf->reloc_base = NULL;
	cmdbuf->reloc_idx = NULL;
	cmdbuf->buffer_refs_count = 0;
	cmdbuf->buffer_refs_allocated = 10;
	cmdbuf->buffer_refs = (psb_buffer_p *) calloc(1, sizeof(psb_buffer_p) * cmdbuf->buffer_refs_allocated);
	if (NULL == cmdbuf->buffer_refs) {
		cmdbuf->buffer_refs_allocated = 0;
		vaStatus = VA_STATUS_ERROR_ALLOCATION_FAILED;
		goto err1;
	}

	vaStatus = psb_buffer_create(driver_data, size, psb_bt_cpu_only, &cmdbuf->buf);
	cmdbuf->size = size;

	if (VA_STATUS_SUCCESS != vaStatus)
		goto err2;

	vaStatus = psb_buffer_create(driver_data, ctx->param_sz, psb_bt_cpu_vpu, &cmdbuf->param_mem);
	if (VA_STATUS_SUCCESS != vaStatus)
		goto err3;

	return vaStatus;
err3:
	psb_buffer_destroy(&cmdbuf->buf);
err2:
	free(cmdbuf->buffer_refs);
	cmdbuf->buffer_refs = NULL;
	cmdbuf->buffer_refs_allocated = 0;
err1:
	return vaStatus;
}

/*
 * Destroy buffer
 */
void vsp_cmdbuf_destroy(vsp_cmdbuf_p cmdbuf)
{
	if (cmdbuf->size) {
		psb_buffer_destroy(&cmdbuf->buf);
		cmdbuf->size = 0;
	}
	if (cmdbuf->buffer_refs_allocated) {
		free(cmdbuf->buffer_refs);
		cmdbuf->buffer_refs = NULL;
		cmdbuf->buffer_refs_allocated = 0;
	}
	psb_buffer_destroy(&cmdbuf->param_mem);
}

/*
 * Reset buffer & map
 *
 * Returns 0 on success
 */
int vsp_cmdbuf_reset(vsp_cmdbuf_p cmdbuf)
{
	int ret;

	cmdbuf->cmd_base = NULL;
	cmdbuf->cmd_idx = NULL;
	cmdbuf->reloc_base = NULL;
	cmdbuf->reloc_idx = NULL;

	cmdbuf->buffer_refs_count = 0;
	cmdbuf->cmd_count = 0;

	ret = psb_buffer_map(&cmdbuf->buf, &cmdbuf->cmd_base);
	if (ret) {
		return ret;
	}

	cmdbuf->cmd_start = cmdbuf->cmd_base;
	cmdbuf->cmd_idx = (uint32_t *) cmdbuf->cmd_base;

	cmdbuf->reloc_base = cmdbuf->cmd_base + CMD_SIZE;
	cmdbuf->reloc_idx = (struct drm_psb_reloc *) cmdbuf->reloc_base;

	/* Add ourselves to the buffer list */
	vsp_cmdbuf_buffer_ref(cmdbuf, &cmdbuf->buf); /* cmd buf == 0 */

	return ret;
}

/*
 * Unmap buffer
 *
 * Returns 0 on success
 */
int vsp_cmdbuf_unmap(vsp_cmdbuf_p cmdbuf)
{
	cmdbuf->cmd_base = NULL;
	cmdbuf->cmd_start = NULL;
	cmdbuf->cmd_idx = NULL;
	cmdbuf->reloc_base = NULL;
	cmdbuf->reloc_idx = NULL;
	cmdbuf->cmd_count = 0;
	psb_buffer_unmap(&cmdbuf->buf);
	return 0;
}

/*
 * Reference an addtional buffer "buf" in the command stream
 * Returns a reference index that can be used to refer to "buf" in
 * relocation records, -1 on error
 */
int vsp_cmdbuf_buffer_ref(vsp_cmdbuf_p cmdbuf, psb_buffer_p buf)
{
	int item_loc = 0;

	/*Reserve the same TTM BO twice will cause kernel lock up*/
	while ((item_loc < cmdbuf->buffer_refs_count)
	       && (wsbmKBufHandle(wsbmKBuf(cmdbuf->buffer_refs[item_loc]->drm_buf))
		   != wsbmKBufHandle(wsbmKBuf(buf->drm_buf)))) {
		item_loc++;
	}
	if (item_loc == cmdbuf->buffer_refs_count) {
		/* Add new entry */
		if (item_loc >= cmdbuf->buffer_refs_allocated) {
			/* Allocate more entries */
			int new_size = cmdbuf->buffer_refs_allocated + 10;
			psb_buffer_p *new_array;
			new_array = (psb_buffer_p *) calloc(1, sizeof(psb_buffer_p) * new_size);
			if (NULL == new_array) {
				return -1; /* Allocation failure */
			}
			memcpy(new_array, cmdbuf->buffer_refs, sizeof(psb_buffer_p) * cmdbuf->buffer_refs_allocated);
			free(cmdbuf->buffer_refs);
			cmdbuf->buffer_refs_allocated = new_size;
			cmdbuf->buffer_refs = new_array;
		}
		cmdbuf->buffer_refs[item_loc] = buf;
		cmdbuf->buffer_refs_count++;
		buf->status = psb_bs_queued;
	}
	return item_loc;
}

/* Creates a relocation record for a DWORD in the mapped "cmdbuf" at address
 * "addr_in_cmdbuf"
 * The relocation is based on the device virtual address of "ref_buffer"
 * "buf_offset" is be added to the device virtual address, and the sum is then
 * right shifted with "align_shift".
 * "mask" determines which bits of the target DWORD will be updated with the so
 * constructed address. The remaining bits will be filled with bits from "background".
 */
void vsp_cmdbuf_add_relocation(vsp_cmdbuf_p cmdbuf,
			       uint32_t *addr_in_dst_buffer,/*addr of dst_buffer for the DWORD*/
			       psb_buffer_p ref_buffer,
			       uint32_t buf_offset,
			       uint32_t mask,
			       uint32_t background,
			       uint32_t align_shift,
			       uint32_t dst_buffer,
			       uint32_t *start_of_dst_buffer) /*Index of the list refered by cmdbuf->buffer_refs */
{
    struct drm_psb_reloc *reloc = cmdbuf->reloc_idx;
    uint64_t presumed_offset = wsbmBOOffsetHint(ref_buffer->drm_buf);

    reloc->where = addr_in_dst_buffer - start_of_dst_buffer; /* Offset in DWORDs */

    reloc->buffer = vsp_cmdbuf_buffer_ref(cmdbuf, ref_buffer);
    ASSERT(reloc->buffer != -1);

    reloc->reloc_op = PSB_RELOC_OP_OFFSET;
#ifndef VA_EMULATOR
    if (presumed_offset) {
	uint32_t new_val =  presumed_offset + buf_offset;

	new_val = ((new_val >> align_shift) << (align_shift << PSB_RELOC_ALSHIFT_SHIFT));
	new_val = (background & ~mask) | (new_val & mask);
	*addr_in_dst_buffer = new_val;
    } else {
	*addr_in_dst_buffer = PSB_RELOC_MAGIC;
    }
#else
    /* indicate subscript of relocation buffer */
    *addr_in_dst_buffer = reloc - (struct drm_psb_reloc *)cmdbuf->reloc_base;
#endif
    reloc->mask = mask;
    reloc->shift = align_shift << PSB_RELOC_ALSHIFT_SHIFT;
    reloc->pre_add = buf_offset;
    reloc->background = background;
    reloc->dst_buffer = dst_buffer;
    cmdbuf->reloc_idx++;

    ASSERT(((unsigned char *)(cmdbuf->reloc_idx)) < RELOC_END(cmdbuf));
}

/*
 * Advances "obj_context" to the next cmdbuf
 *
 * Returns 0 on success
 */
int vsp_context_get_next_cmdbuf(object_context_p obj_context)
{
	vsp_cmdbuf_p cmdbuf;
	int ret;

	if (obj_context->vsp_cmdbuf) {
		return 0;
	}

	obj_context->cmdbuf_current++;
	if (obj_context->cmdbuf_current >= VSP_MAX_CMDBUFS) {
		obj_context->cmdbuf_current = 0;
	}

	cmdbuf = obj_context->vsp_cmdbuf_list[obj_context->cmdbuf_current];

	ret = vsp_cmdbuf_reset(cmdbuf);
	if (!ret) {
		/* Success */
		obj_context->vsp_cmdbuf = cmdbuf;
	}

	cmdbuf->param_mem_loc = vsp_cmdbuf_buffer_ref(cmdbuf, &cmdbuf->param_mem);

	return ret;
}

/*
 * This is the user-space do-it-all interface to the drm cmdbuf ioctl.
 * It allows different buffers as command- and reloc buffer. A list of
 * cliprects to apply and whether to copy the clipRect content to all
 * scanout buffers (damage = 1).
 */
/*
 * Don't add debug statements in this function, it gets called with the
 * DRM lock held and output to an X terminal can cause X to deadlock
 */
static int
vspDRMCmdBuf(int fd, int ioctl_offset, psb_buffer_p *buffer_list, int buffer_count, unsigned cmdBufHandle,
	     unsigned cmdBufOffset, unsigned cmdBufSize,
	     unsigned relocBufHandle, unsigned relocBufOffset,
	     unsigned numRelocs, int __maybe_unused damage,
	     unsigned engine, unsigned fence_flags, struct psb_ttm_fence_rep *fence_rep)
{
	drm_psb_cmdbuf_arg_t ca;
	struct psb_validate_arg *arg_list;
	int i;
	int ret = 0;
	uint64_t mask = PSB_GPU_ACCESS_MASK;
	arg_list = (struct psb_validate_arg *) calloc(1, sizeof(struct psb_validate_arg) * buffer_count);
	if (arg_list == NULL) {
		drv_debug_msg(VIDEO_DEBUG_ERROR, "Allocate memory failed\n");
		return -ENOMEM;
	}

	for (i = 0; i < buffer_count; i++) {
		struct psb_validate_arg *arg = &(arg_list[i]);
		struct psb_validate_req *req = &arg->d.req;

		req->next = (unsigned long) & (arg_list[i+1]);

		req->buffer_handle = wsbmKBufHandle(wsbmKBuf(buffer_list[i]->drm_buf));
		//req->group = 0;
		req->set_flags = (PSB_GPU_ACCESS_READ | PSB_GPU_ACCESS_WRITE) & mask;
		req->clear_flags = (~(PSB_GPU_ACCESS_READ | PSB_GPU_ACCESS_WRITE)) & mask;
#if 1
		req->presumed_gpu_offset = (uint64_t)wsbmBOOffsetHint(buffer_list[i]->drm_buf);
		req->presumed_flags = PSB_USE_PRESUMED;
                req->unfence_flag = buffer_list[i]->unfence_flag;
#else
		req->presumed_flags = 0;
#endif
		req->pad64 = (uint32_t)buffer_list[i]->pl_flags;
	}
	arg_list[buffer_count-1].d.req.next = 0;

	ca.buffer_list = (uint64_t)((unsigned long)arg_list);
	ca.cmdbuf_handle = cmdBufHandle;
	ca.cmdbuf_offset = cmdBufOffset;
	ca.cmdbuf_size = cmdBufSize;
	ca.reloc_handle = relocBufHandle;
	ca.reloc_offset = relocBufOffset;
	ca.num_relocs = numRelocs;
	ca.engine = engine;
	ca.fence_flags = fence_flags;
	ca.fence_arg = (uint64_t)((unsigned long)fence_rep);

	do {
		ret = drmCommandWrite(fd, ioctl_offset, &ca, sizeof(ca));
	} while (ret == EAGAIN);

	if (ret)
		goto out;

	for (i = 0; i < buffer_count; i++) {
		struct psb_validate_arg *arg = &(arg_list[i]);
		struct psb_validate_rep *rep = &arg->d.rep;

		if (!arg->handled) {
			ret = -EFAULT;
			goto out;
		}
		if (arg->ret != 0) {
			ret = arg->ret;
			goto out;
		}
		wsbmUpdateKBuf(wsbmKBuf(buffer_list[i]->drm_buf),
			       rep->gpu_offset, rep->placement, rep->fence_type_mask);
	}
out:
	free(arg_list);
	for (i = 0; i < buffer_count; i++) {
		/*
		 * Buffer no longer queued in userspace
		 */
		switch (buffer_list[i]->status) {
		case psb_bs_queued:
			buffer_list[i]->status = psb_bs_ready;
			break;

		case psb_bs_abandoned:
			psb_buffer_destroy(buffer_list[i]);
			free(buffer_list[i]);
			break;

		default:
			/* Not supposed to happen */
			ASSERT(0);
		}
	}

	return ret;
}

/*
 * Submits the current cmdbuf
 *
 * Returns 0 on success
 */
int vsp_context_submit_cmdbuf(object_context_p __maybe_unused obj_context)
{
	return 0;
}


/*
 * Flushes all cmdbufs
 */
int vsp_context_flush_cmdbuf(object_context_p obj_context)
{
	vsp_cmdbuf_p cmdbuf = obj_context->vsp_cmdbuf;
	psb_driver_data_p driver_data = obj_context->driver_data;
	unsigned int fence_flags;
	struct psb_ttm_fence_rep fence_rep;
	unsigned int reloc_offset;
	unsigned int num_relocs;
	int ret;
	unsigned int cmdbuffer_size = (unsigned char *)cmdbuf->cmd_idx - cmdbuf->cmd_start; /* In bytes */

	ASSERT(cmdbuffer_size < CMD_SIZE);
	ASSERT((void *) cmdbuf->cmd_idx < CMD_END(cmdbuf));
	/* LOCK */
	ret = LOCK_HARDWARE(driver_data);
	if (ret) {
		UNLOCK_HARDWARE(driver_data);
		DEBUG_FAILURE_RET;
		return ret;
	}

	/* Now calculate the total number of relocations */
	reloc_offset = cmdbuf->reloc_base - cmdbuf->cmd_base;
	num_relocs = ((unsigned char *)cmdbuf->reloc_idx - cmdbuf->reloc_base) / sizeof(struct drm_psb_reloc);

	vsp_cmdbuf_unmap(cmdbuf);

	ASSERT(NULL == cmdbuf->reloc_base);

#ifdef DEBUG_TRACE
	fence_flags = 0;
#else
	fence_flags = DRM_PSB_FENCE_NO_USER;
#endif

#ifndef VSP_ENGINE_VPP
#define VSP_ENGINE_VPP  6
#endif
	wsbmWriteLockKernelBO();
	ret = vspDRMCmdBuf(driver_data->drm_fd, driver_data->execIoctlOffset,
			   cmdbuf->buffer_refs, cmdbuf->buffer_refs_count, wsbmKBufHandle(wsbmKBuf(cmdbuf->buf.drm_buf)),
			   0, cmdbuffer_size,/*unsigned cmdBufSize*/
			   wsbmKBufHandle(wsbmKBuf(cmdbuf->buf.drm_buf)), reloc_offset, num_relocs,
			   0, VSP_ENGINE_VPP, fence_flags, &fence_rep);
	wsbmWriteUnlockKernelBO();
	UNLOCK_HARDWARE(driver_data);

	if (ret) {
		obj_context->vsp_cmdbuf = NULL;

		DEBUG_FAILURE_RET;
		return ret;
	}

	obj_context->vsp_cmdbuf = NULL;

	return 0;
}