/*
 * Copyright (C) 2009 Intel Corporation
 *
 * 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:
 *    Xiang Haihao <haihao.xiang@intel.com>
 *    Zou Nan hai <nanhai.zou@intel.com>
 *
 */

#include "sysdeps.h"

#include <va/va_drmcommon.h>

#include "intel_batchbuffer.h"
#include "intel_memman.h"
#include "intel_driver.h"
uint32_t g_intel_debug_option_flags = 0;

#ifdef I915_PARAM_HAS_BSD2
#define LOCAL_I915_PARAM_HAS_BSD2 I915_PARAM_HAS_BSD2
#endif

#ifndef LOCAL_I915_PARAM_HAS_BSD2
#define LOCAL_I915_PARAM_HAS_BSD2   30
#endif

#ifdef I915_PARAM_HAS_HUC
#define LOCAL_I915_PARAM_HAS_HUC I915_PARAM_HAS_HUC
#else
#define LOCAL_I915_PARAM_HAS_HUC 42
#endif

#ifdef I915_PARAM_EU_TOTAL
#define LOCAL_I915_PARAM_EU_TOTAL I915_PARAM_EU_TOTAL
#else
#define LOCAL_I915_PARAM_EU_TOTAL 34
#endif

struct debug_flag
{
	enum intel_debug_flags value;
	const char* name;
	const char* description;
};

static const struct debug_flag flags[] = {
	{INTEL_DEBUG_FLAGS_NONE, "NONE", NULL},
	{INTEL_DEBUG_FLAGS_ASSERTS, "ASSERTS", "Enable driver asserts for debugging purposes"},
	{INTEL_DEBUG_FLAGS_BENCH, "BENCH", "Disable calling swap_buffer in the X11 backend"},
	{INTEL_DEBUG_FLAGS_DUMP_AUB, "DUMP_AUB", "Dumps all buffer submissions into an AUB trace (deprecated)"},
	{INTEL_DEBUG_FLAGS_VERBOSE, "VERBOSE", "Enable verbose logging"}
};

static Bool
intel_driver_get_param(struct intel_driver_data *intel, int param, int *value)
{
	struct drm_i915_getparam gp;

	gp.param = param;
	gp.value = value;

	return drmCommandWriteRead(intel->fd, DRM_I915_GETPARAM, &gp, sizeof(gp)) == 0;
}

static void intel_driver_get_revid(struct intel_driver_data *intel, int *value)
{
#define PCI_REVID   8
	FILE *fp;
	char config_data[16];

	fp = fopen("/sys/devices/pci0000:00/0000:00:02.0/config", "r");

	if (fp) {
		if (fread(config_data, 1, 16, fp))
			*value = config_data[PCI_REVID];
		else
			*value = 2; /* assume it is at least  B-steping */
		fclose(fp);
	} else {
		*value = 2; /* assume it is at least  B-steping */
	}

	return;
}

extern const struct intel_device_info *i965_get_device_info(int devid);

bool should_enable_int(const char* str)
{
	char *env_str = NULL;
	if (!(env_str = getenv(str)))
		return false;

	return atoi(env_str);
}

static inline void
intel_driver_handle_debug(void)
{
	g_intel_debug_option_flags = 0;

	char *env_str = NULL;
	if ((env_str = getenv("VA_INTEL_DEBUG")))
	{
		if (strcmp("help", env_str) == 0)
		{
			fprintf(stderr, "Available debug options for i965:\n");

			for (int i = 0; i < sizeof(flags) / sizeof(struct debug_flag); i++)
			{
				const struct debug_flag flag = flags[i];

				if (flag.value == INTEL_DEBUG_FLAGS_NONE)
					continue;

				fprintf(stderr, "\t%s (%d) = %s\n", flag.name, flag.value, flag.description);
			}

			return;
		}

		g_intel_debug_option_flags = atoi(env_str);
	}

	if (g_intel_debug_option_flags & INTEL_DEBUG_FLAGS_VERBOSE)
		fprintf(stderr, "i965: Verbose logging enabled.\n");
}

bool
intel_driver_init(VADriverContextP ctx)
{
	struct intel_driver_data *intel = intel_driver_data(ctx);
	struct drm_state * const drm_state = (struct drm_state *)ctx->drm_state;
	int has_exec2 = 0, has_bsd = 0, has_blt = 0, has_vebox = 0;
	int ret_value = 0;

	intel_driver_handle_debug();

	ASSERT_RET(drm_state, false);
	ASSERT_RET((VA_CHECK_DRM_AUTH_TYPE(ctx, VA_DRM_AUTH_DRI1) ||
				VA_CHECK_DRM_AUTH_TYPE(ctx, VA_DRM_AUTH_DRI2) ||
				VA_CHECK_DRM_AUTH_TYPE(ctx, VA_DRM_AUTH_CUSTOM)),
			   false);

	intel->fd = drm_state->fd;
	intel->dri2Enabled = (VA_CHECK_DRM_AUTH_TYPE(ctx, VA_DRM_AUTH_DRI2) ||
						  VA_CHECK_DRM_AUTH_TYPE(ctx, VA_DRM_AUTH_CUSTOM));

	if (!intel->dri2Enabled) {
		return false;
	}

	intel->locked = 0;
	pthread_mutex_init(&intel->ctxmutex, NULL);

	if (!intel_memman_init(intel))
		return false;

	intel->device_id = drm_intel_bufmgr_gem_get_devid(intel->bufmgr);
	intel->device_info = i965_get_device_info(intel->device_id);

	if (!intel->device_info)
		return false;

	if (intel_driver_get_param(intel, I915_PARAM_HAS_EXECBUF2, &has_exec2))
		intel->has_exec2 = has_exec2;
	if (intel_driver_get_param(intel, I915_PARAM_HAS_BSD, &has_bsd))
		intel->has_bsd = has_bsd;
	if (intel_driver_get_param(intel, I915_PARAM_HAS_BLT, &has_blt))
		intel->has_blt = has_blt;
	if (intel_driver_get_param(intel, I915_PARAM_HAS_VEBOX, &has_vebox))
		intel->has_vebox = !!has_vebox;

	intel->has_bsd2 = 0;
	if (intel_driver_get_param(intel, LOCAL_I915_PARAM_HAS_BSD2, &ret_value))
		intel->has_bsd2 = !!ret_value;

	intel->has_huc = 0;
	ret_value = 0;

	if (intel_driver_get_param(intel, LOCAL_I915_PARAM_HAS_HUC, &ret_value))
		intel->has_huc = !!ret_value;

	intel->eu_total = 0;
	if (intel_driver_get_param(intel, LOCAL_I915_PARAM_EU_TOTAL, &ret_value)) {
		intel->eu_total = ret_value;
	}

	intel->mocs_state = 0;
	intel->hybrid_vp8 = should_enable_int("I965_VP8_ENCODE");
	intel->rc_hw_mode = should_enable_int("I965_RC_COUNTER");
	intel->dec_base = should_enable_int("I965_BASE_DECODING");

#define GEN9_PTE_CACHE    2

	if (IS_GEN9(intel->device_info) ||
		IS_GEN10(intel->device_info))
		intel->mocs_state = GEN9_PTE_CACHE;

	intel_driver_get_revid(intel, &intel->revision);
	return true;
}

void
intel_driver_terminate(VADriverContextP ctx)
{
	struct intel_driver_data *intel = intel_driver_data(ctx);

	intel_memman_terminate(intel);
	pthread_mutex_destroy(&intel->ctxmutex);
}
