// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
 */

#include <linux/debugfs.h>
#include <linux/videodev2.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <media/cam_sync.h>
#include <media/cam_defs.h>
#include <media/cam_icp.h>
#include "cam_node.h"
#include "cam_context.h"
#include "cam_context_utils.h"
#include "cam_icp_context.h"
#include "cam_req_mgr_util.h"
#include "cam_mem_mgr.h"
#include "cam_trace.h"
#include "cam_debug_util.h"
#include "cam_packet_util.h"

static const char icp_dev_name[] = "cam-icp";

static int cam_icp_context_dump_active_request(void *data, unsigned long iova,
	uint32_t buf_info)
{
	struct cam_context *ctx = (struct cam_context *)data;
	struct cam_ctx_request          *req = NULL;
	struct cam_ctx_request          *req_temp = NULL;
	struct cam_hw_mgr_dump_pf_data  *pf_dbg_entry = NULL;
	int rc = 0;
	bool b_mem_found = false;

	if (!ctx) {
		CAM_ERR(CAM_ICP, "Invalid ctx");
		return -EINVAL;
	}

	if (ctx->state < CAM_CTX_ACQUIRED || ctx->state > CAM_CTX_ACTIVATED) {
		CAM_ERR(CAM_ICP, "Invalid state icp ctx %d state %d",
			ctx->ctx_id, ctx->state);
		goto end;
	}

	CAM_INFO(CAM_ICP, "iommu fault for icp ctx %d state %d",
		ctx->ctx_id, ctx->state);

	list_for_each_entry_safe(req, req_temp,
			&ctx->active_req_list, list) {
		pf_dbg_entry = &(req->pf_data);
		CAM_INFO(CAM_ICP, "req_id : %lld", req->request_id);

		rc = cam_context_dump_pf_info_to_hw(ctx, pf_dbg_entry->packet,
			iova, buf_info, &b_mem_found);
		if (rc)
			CAM_ERR(CAM_ICP, "Failed to dump pf info");

		if (b_mem_found)
			CAM_ERR(CAM_ICP, "Found page fault in req %lld %d",
				req->request_id, rc);
	}

end:
	return rc;
}

static int __cam_icp_acquire_dev_in_available(struct cam_context *ctx,
	struct cam_acquire_dev_cmd *cmd)
{
	int rc;

	rc = cam_context_acquire_dev_to_hw(ctx, cmd);
	if (!rc) {
		ctx->state = CAM_CTX_ACQUIRED;
		trace_cam_context_state("ICP", ctx);
	}

	return rc;
}

static int __cam_icp_release_dev_in_acquired(struct cam_context *ctx,
	struct cam_release_dev_cmd *cmd)
{
	int rc;

	rc = cam_context_release_dev_to_hw(ctx, cmd);
	if (rc)
		CAM_ERR(CAM_ICP, "Unable to release device");

	ctx->state = CAM_CTX_AVAILABLE;
	trace_cam_context_state("ICP", ctx);
	return rc;
}

static int __cam_icp_start_dev_in_acquired(struct cam_context *ctx,
	struct cam_start_stop_dev_cmd *cmd)
{
	int rc;

	rc = cam_context_start_dev_to_hw(ctx, cmd);
	if (!rc) {
		ctx->state = CAM_CTX_READY;
		trace_cam_context_state("ICP", ctx);
	}

	return rc;
}

static int __cam_icp_flush_dev_in_ready(struct cam_context *ctx,
	struct cam_flush_dev_cmd *cmd)
{
	int rc;

	rc = cam_context_flush_dev_to_hw(ctx, cmd);
	if (rc)
		CAM_ERR(CAM_ICP, "Failed to flush device");

	return rc;
}

static int __cam_icp_config_dev_in_ready(struct cam_context *ctx,
	struct cam_config_dev_cmd *cmd)
{
	int rc;
	size_t len;
	uintptr_t packet_addr;
	struct cam_packet *packet;
	size_t remain_len = 0;

	rc = cam_mem_get_cpu_buf((int32_t) cmd->packet_handle,
		&packet_addr, &len);
	if (rc) {
		CAM_ERR(CAM_ICP, "[%s][%d] Can not get packet address",
			ctx->dev_name, ctx->ctx_id);
		rc = -EINVAL;
		return rc;
	}

	remain_len = len;
	if ((len < sizeof(struct cam_packet)) ||
		(cmd->offset >= (len - sizeof(struct cam_packet)))) {
		CAM_ERR(CAM_CTXT,
			"Invalid offset, len: %zu cmd offset: %llu sizeof packet: %zu",
			len, cmd->offset, sizeof(struct cam_packet));
		return -EINVAL;
	}

	remain_len -= (size_t)cmd->offset;
	packet = (struct cam_packet *) ((uint8_t *)packet_addr +
		(uint32_t)cmd->offset);

	rc = cam_packet_util_validate_packet(packet, remain_len);
	if (rc) {
		CAM_ERR(CAM_CTXT, "Invalid packet params, remain length: %zu",
			remain_len);
		return rc;
	}

	if (((packet->header.op_code & 0xff) ==
		CAM_ICP_OPCODE_IPE_SETTINGS) ||
		((packet->header.op_code & 0xff) ==
		CAM_ICP_OPCODE_BPS_SETTINGS))
		rc = cam_context_config_dev_to_hw(ctx, cmd);
	else
		rc = cam_context_prepare_dev_to_hw(ctx, cmd);

	if (rc)
		CAM_ERR(CAM_ICP, "Failed to prepare device");

	return rc;
}

static int __cam_icp_stop_dev_in_ready(struct cam_context *ctx,
	struct cam_start_stop_dev_cmd *cmd)
{
	int rc;

	rc = cam_context_stop_dev_to_hw(ctx);
	if (rc)
		CAM_ERR(CAM_ICP, "Failed to stop device");

	ctx->state = CAM_CTX_ACQUIRED;
	trace_cam_context_state("ICP", ctx);
	return rc;
}

static int __cam_icp_release_dev_in_ready(struct cam_context *ctx,
	struct cam_release_dev_cmd *cmd)
{
	int rc;

	rc = __cam_icp_stop_dev_in_ready(ctx, NULL);
	if (rc)
		CAM_ERR(CAM_ICP, "Failed to stop device");

	rc = __cam_icp_release_dev_in_acquired(ctx, cmd);
	if (rc)
		CAM_ERR(CAM_ICP, "Failed to release device");

	return rc;
}

static int __cam_icp_handle_buf_done_in_ready(void *ctx,
	uint32_t evt_id, void *done)
{
	return cam_context_buf_done_from_hw(ctx, done, evt_id);
}

static struct cam_ctx_ops
	cam_icp_ctx_state_machine[CAM_CTX_STATE_MAX] = {
	/* Uninit */
	{
		.ioctl_ops = {},
		.crm_ops = {},
		.irq_ops = NULL,
	},
	/* Available */
	{
		.ioctl_ops = {
			.acquire_dev = __cam_icp_acquire_dev_in_available,
		},
		.crm_ops = {},
		.irq_ops = NULL,
	},
	/* Acquired */
	{
		.ioctl_ops = {
			.release_dev = __cam_icp_release_dev_in_acquired,
			.start_dev = __cam_icp_start_dev_in_acquired,
			.config_dev = __cam_icp_config_dev_in_ready,
			.flush_dev = __cam_icp_flush_dev_in_ready,
		},
		.crm_ops = {},
		.irq_ops = __cam_icp_handle_buf_done_in_ready,
		.pagefault_ops = cam_icp_context_dump_active_request,
	},
	/* Ready */
	{
		.ioctl_ops = {
			.stop_dev = __cam_icp_stop_dev_in_ready,
			.release_dev = __cam_icp_release_dev_in_ready,
			.config_dev = __cam_icp_config_dev_in_ready,
			.flush_dev = __cam_icp_flush_dev_in_ready,
		},
		.crm_ops = {},
		.irq_ops = __cam_icp_handle_buf_done_in_ready,
		.pagefault_ops = cam_icp_context_dump_active_request,
	},
	/* Flushed */
	{},
	/* Activated */
	{
		.ioctl_ops = {},
		.crm_ops = {},
		.irq_ops = NULL,
		.pagefault_ops = cam_icp_context_dump_active_request,
	},
};

int cam_icp_context_init(struct cam_icp_context *ctx,
	struct cam_hw_mgr_intf *hw_intf, uint32_t ctx_id)
{
	int rc;

	if ((!ctx) || (!ctx->base) || (!hw_intf)) {
		CAM_ERR(CAM_ICP, "Invalid params: %pK %pK", ctx, hw_intf);
		rc = -EINVAL;
		goto err;
	}

	rc = cam_context_init(ctx->base, icp_dev_name, CAM_ICP, ctx_id,
		NULL, hw_intf, ctx->req_base, CAM_CTX_REQ_MAX);
	if (rc) {
		CAM_ERR(CAM_ICP, "Camera Context Base init failed");
		goto err;
	}

	ctx->base->state_machine = cam_icp_ctx_state_machine;
	ctx->base->ctx_priv = ctx;
	ctx->ctxt_to_hw_map = NULL;

err:
	return rc;
}

int cam_icp_context_deinit(struct cam_icp_context *ctx)
{
	if ((!ctx) || (!ctx->base)) {
		CAM_ERR(CAM_ICP, "Invalid params: %pK", ctx);
		return -EINVAL;
	}

	cam_context_deinit(ctx->base);
	memset(ctx, 0, sizeof(*ctx));

	return 0;
}