// SPDX-License-Identifier: MIT
/*
 * Copyright © 2023 Intel Corporation
 */

/**
 * TEST: kms_fb_coherency
 * Category: Display
 * Description: Exercise coherency of future scanout buffer objects
 * Mega feature: General Display Features
 * Driver requirement: i915, xe
 */

#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>

#include "igt.h"
#include "xe/xe_ioctl.h"

/**
 * SUBTEST: memset-crc
 * Description: Use display controller CRC hardware to validate (non)coherency
 *		of memset operations on future scanout buffer objects
 *		mmapped with different mmap methods and different caching modes.
 */

typedef struct {
	int drm_fd;
	igt_display_t display;
	struct igt_fb fb[2];
	igt_output_t *output;
	igt_plane_t *primary;
	enum pipe pipe;
	igt_crc_t ref_crc;
	igt_pipe_crc_t *pipe_crc;
	uint32_t devid;
} data_t;

static void prepare_crtc(data_t *data)
{
	igt_display_t *display = &data->display;
	igt_output_t *output = data->output;
	drmModeModeInfo *mode;

	igt_display_reset(display);
	/* select the pipe we want to use */
	igt_output_set_pipe(output, data->pipe);

	mode = igt_output_get_mode(output);

	/* create a white reference fb and flip to it */
	igt_create_color_fb(data->drm_fd, mode->hdisplay, mode->vdisplay,
			    DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_LINEAR,
			    1.0, 1.0, 1.0, &data->fb[0]);

	data->primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);

	igt_plane_set_fb(data->primary, &data->fb[0]);
	igt_display_commit(display);

	if (data->pipe_crc)
		igt_pipe_crc_free(data->pipe_crc);

	data->pipe_crc = igt_pipe_crc_new(data->drm_fd, data->pipe,
					  IGT_PIPE_CRC_SOURCE_AUTO);

	/* get reference crc for the white fb */
	igt_pipe_crc_collect_crc(data->pipe_crc, &data->ref_crc);
}

static struct igt_fb *prepare_fb(data_t *data)
{
	igt_output_t *output = data->output;
	struct igt_fb *fb = &data->fb[1];
	drmModeModeInfo *mode;

	prepare_crtc(data);

	mode = igt_output_get_mode(output);

	/* create a non-white fb we can overwrite later */
	igt_create_pattern_fb(data->drm_fd, mode->hdisplay, mode->vdisplay,
			      DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_LINEAR, fb);

	/* flip to it to make it UC/WC and fully flushed */
	drmModeSetPlane(data->drm_fd,
			data->primary->drm_plane->plane_id,
			output->config.crtc->crtc_id,
			fb->fb_id, 0,
			0, 0, fb->width, fb->height,
			0, 0, fb->width << 16, fb->height << 16);

	/* flip back the original white buffer */
	drmModeSetPlane(data->drm_fd,
			data->primary->drm_plane->plane_id,
			output->config.crtc->crtc_id,
			data->fb[0].fb_id, 0,
			0, 0, fb->width, fb->height,
			0, 0, fb->width << 16, fb->height << 16);

	if (is_i915_device(data->drm_fd) && !gem_has_lmem(data->drm_fd)) {
		uint32_t caching;

		/* make sure caching mode has become UC/WT */
		caching = gem_get_caching(data->drm_fd, fb->gem_handle);
		igt_assert(caching == I915_CACHING_NONE ||
			   caching == I915_CACHING_DISPLAY);
	}

	return fb;
}

static void check_buf_crc(data_t *data, void *buf, igt_fb_t *fb)
{
	igt_crc_t crc;

	/* use memset to make the mmapped fb all white */
	memset(buf, 0xff, fb->size);
	munmap(buf, fb->size);

	/* and flip to it */
	drmModeSetPlane(data->drm_fd,
			data->primary->drm_plane->plane_id,
			data->output->config.crtc->crtc_id,
			fb->fb_id, 0,
			0, 0, fb->width, fb->height,
			0, 0, fb->width << 16, fb->height << 16);

	/* check that the crc is as expected, which requires that caches got flushed */
	igt_pipe_crc_collect_crc(data->pipe_crc, &crc);
	igt_assert_crc_equal(&crc, &data->ref_crc);
}

static void cleanup_crtc(data_t *data)
{
	igt_display_t *display = &data->display;
	igt_output_t *output = data->output;

	igt_pipe_crc_free(data->pipe_crc);
	data->pipe_crc = NULL;

	igt_plane_set_fb(data->primary, NULL);

	igt_output_set_pipe(output, PIPE_ANY);
	igt_display_commit(display);

	igt_remove_fb(data->drm_fd, &data->fb[0]);
	igt_remove_fb(data->drm_fd, &data->fb[1]);
}

static void test_mmap_gtt(data_t *data)
{
	igt_fb_t *fb;
	void *buf;

	fb = prepare_fb(data);

	buf = gem_mmap__gtt(data->drm_fd, fb->gem_handle, fb->size, PROT_WRITE);

	check_buf_crc(data, buf, fb);
}

static void test_mmap_offset_wc(data_t *data)
{
	igt_fb_t *fb;
	void *buf;

	fb = prepare_fb(data);

	if (is_i915_device(data->drm_fd))
		buf = gem_mmap_offset__wc(data->drm_fd, fb->gem_handle, 0, fb->size, PROT_WRITE);
	else
		buf = xe_bo_mmap_ext(data->drm_fd, fb->gem_handle, fb->size, PROT_WRITE);

	check_buf_crc(data, buf, fb);
}

static void test_mmap_offset_uc(data_t *data)
{
	igt_fb_t *fb;
	void *buf;

	fb = prepare_fb(data);

	/* mmap the fb */
	buf = __gem_mmap_offset(data->drm_fd, fb->gem_handle, 0, fb->size, PROT_WRITE,
				I915_MMAP_OFFSET_UC);
	igt_assert(buf);

	check_buf_crc(data, buf, fb);
}

static void test_mmap_offset_fixed(data_t *data)
{
	igt_fb_t *fb;
	void *buf;

	fb = prepare_fb(data);

	/* mmap the fb */
	buf = gem_mmap_offset__fixed(data->drm_fd, fb->gem_handle, 0, fb->size, PROT_WRITE);

	check_buf_crc(data, buf, fb);
}

static void test_legacy_mmap_wc(data_t *data)
{
	igt_fb_t *fb;
	void *buf;

	fb = prepare_fb(data);

	/* mmap the fb */
	buf = gem_mmap__wc(data->drm_fd, fb->gem_handle, 0, fb->size, PROT_WRITE);

	check_buf_crc(data, buf, fb);
}

static void select_valid_pipe_output_combo(data_t *data)
{
	igt_display_t *display = &data->display;

	for_each_pipe_with_valid_output(display, data->pipe, data->output) {
		igt_display_reset(display);

		igt_output_set_pipe(data->output, data->pipe);
		if (intel_pipe_output_combo_valid(display))
			return;
	}

	igt_skip("no valid crtc/connector combinations found\n");
}

igt_main
{
	data_t data;

	igt_fixture {
		data.drm_fd = drm_open_driver_master(DRIVER_INTEL | DRIVER_XE);

		data.devid = intel_get_drm_devid(data.drm_fd);

		kmstest_set_vt_graphics_mode();

		igt_require_pipe_crc(data.drm_fd);

		igt_display_require(&data.display, data.drm_fd);

		select_valid_pipe_output_combo(&data);
	}

	igt_subtest_with_dynamic("memset-crc") {
		if (igt_draw_supports_method(data.drm_fd, IGT_DRAW_MMAP_GTT)) {
			igt_dynamic("mmap-gtt")
				test_mmap_gtt(&data);

			cleanup_crtc(&data);
		}

		if (igt_draw_supports_method(data.drm_fd, IGT_DRAW_MMAP_WC)) {
			igt_dynamic("mmap-offset-wc")
				test_mmap_offset_wc(&data);

			cleanup_crtc(&data);
		}

		if (is_i915_device(data.drm_fd)) {
			if (gem_has_lmem(data.drm_fd)) {
				igt_dynamic("mmap-offset-fixed")
					test_mmap_offset_fixed(&data);
			} else if (gem_has_mmap_offset(data.drm_fd)) {
				igt_dynamic("mmap-offset-uc")
					test_mmap_offset_uc(&data);
			}

			cleanup_crtc(&data);

			if (gem_has_legacy_mmap(data.drm_fd) &&
			    gem_mmap__has_wc(data.drm_fd)) {
				igt_dynamic("mmap-legacy-wc")
					test_legacy_mmap_wc(&data);

				cleanup_crtc(&data);
			}
		}
	}

	igt_fixture {
		igt_display_fini(&data.display);
		drm_close_driver(data.drm_fd);
	}
}