/*
 * Copyright © 2016 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, sublicense,
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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 <linux/random.h>

#include "gt/intel_gt_pm.h"
#include "gt/uc/intel_gsc_fw.h"

#include "i915_driver.h"
#include "i915_drv.h"
#include "i915_selftest.h"

#include "igt_flush_test.h"

struct i915_selftest i915_selftest __read_mostly = {
	.timeout_ms = 500,
};

int i915_mock_sanitycheck(void)
{
	pr_info(DRIVER_NAME ": %s() - ok!\n", __func__);
	return 0;
}

int i915_live_sanitycheck(struct drm_i915_private *i915)
{
	pr_info("%s: %s() - ok!\n", i915->drm.driver->name, __func__);
	return 0;
}

enum {
#define selftest(name, func) mock_##name,
#include "i915_mock_selftests.h"
#undef selftest
};

enum {
#define selftest(name, func) live_##name,
#include "i915_live_selftests.h"
#undef selftest
};

enum {
#define selftest(name, func) perf_##name,
#include "i915_perf_selftests.h"
#undef selftest
};

struct selftest {
	bool enabled;
	const char *name;
	union {
		int (*mock)(void);
		int (*live)(struct drm_i915_private *);
	};
};

#define selftest(n, f) [mock_##n] = { .name = #n, { .mock = f } },
static struct selftest mock_selftests[] = {
#include "i915_mock_selftests.h"
};
#undef selftest

#define selftest(n, f) [live_##n] = { .name = #n, { .live = f } },
static struct selftest live_selftests[] = {
#include "i915_live_selftests.h"
};
#undef selftest

#define selftest(n, f) [perf_##n] = { .name = #n, { .live = f } },
static struct selftest perf_selftests[] = {
#include "i915_perf_selftests.h"
};
#undef selftest

/* Embed the line number into the parameter name so that we can order tests */
#define selftest(n, func) selftest_0(n, func, param(n))
#define param(n) __PASTE(igt__, __PASTE(__LINE__, __mock_##n))
#define selftest_0(n, func, id) \
module_param_named(id, mock_selftests[mock_##n].enabled, bool, 0400);
#include "i915_mock_selftests.h"
#undef selftest_0
#undef param

#define param(n) __PASTE(igt__, __PASTE(__LINE__, __live_##n))
#define selftest_0(n, func, id) \
module_param_named(id, live_selftests[live_##n].enabled, bool, 0400);
#include "i915_live_selftests.h"
#undef selftest_0
#undef param

#define param(n) __PASTE(igt__, __PASTE(__LINE__, __perf_##n))
#define selftest_0(n, func, id) \
module_param_named(id, perf_selftests[perf_##n].enabled, bool, 0400);
#include "i915_perf_selftests.h"
#undef selftest_0
#undef param
#undef selftest

static void set_default_test_all(struct selftest *st, unsigned int count)
{
	unsigned int i;

	for (i = 0; i < count; i++)
		if (st[i].enabled)
			return;

	for (i = 0; i < count; i++)
		st[i].enabled = true;
}

static bool
__gsc_proxy_init_progressing(struct intel_gsc_uc *gsc)
{
	return intel_gsc_uc_fw_proxy_get_status(gsc) == -EAGAIN;
}

static void
__wait_gsc_proxy_completed(struct drm_i915_private *i915)
{
	bool need_to_wait = (IS_ENABLED(CONFIG_INTEL_MEI_GSC_PROXY) &&
			     i915->media_gt &&
			     HAS_ENGINE(i915->media_gt, GSC0) &&
			     intel_uc_fw_is_loadable(&i915->media_gt->uc.gsc.fw));
	/*
	 * The gsc proxy component depends on the kernel component driver load ordering
	 * and in corner cases (the first time after an IFWI flash), init-completion
	 * firmware flows take longer.
	 */
	unsigned long timeout_ms = 8000;

	if (need_to_wait && wait_for(!__gsc_proxy_init_progressing(&i915->media_gt->uc.gsc),
				     timeout_ms))
		pr_warn(DRIVER_NAME "Timed out waiting for gsc_proxy_completion!\n");
}

static void
__wait_gsc_huc_load_completed(struct drm_i915_private *i915)
{
	/* this only applies to DG2, so we only care about GT0 */
	struct intel_huc *huc = &to_gt(i915)->uc.huc;
	bool need_to_wait = (IS_ENABLED(CONFIG_INTEL_MEI_PXP) &&
			     intel_huc_wait_required(huc));
	/*
	 * The GSC and PXP mei bringup depends on the kernel boot ordering, so
	 * to account for the worst case scenario the HuC code waits for up to
	 * 10s for the GSC driver to load and then another 5s for the PXP
	 * component to bind before giving up, even though those steps normally
	 * complete in less than a second from the i915 load. We match that
	 * timeout here, but we expect to bail early due to the fence being
	 * signalled even in a failure case, as it is extremely unlikely that
	 * both components will use their full timeout.
	 */
	unsigned long timeout_ms = 15000;

	if (need_to_wait &&
	    wait_for(i915_sw_fence_done(&huc->delayed_load.fence), timeout_ms))
		pr_warn(DRIVER_NAME "Timed out waiting for huc load via GSC!\n");
}

static int __run_selftests(const char *name,
			   struct selftest *st,
			   unsigned int count,
			   void *data)
{
	int err = 0;

	while (!i915_selftest.random_seed)
		i915_selftest.random_seed = get_random_u32();

	i915_selftest.timeout_jiffies =
		i915_selftest.timeout_ms ?
		msecs_to_jiffies_timeout(i915_selftest.timeout_ms) :
		MAX_SCHEDULE_TIMEOUT;

	set_default_test_all(st, count);

	pr_info(DRIVER_NAME ": Performing %s selftests with st_random_seed=0x%x st_timeout=%u\n",
		name, i915_selftest.random_seed, i915_selftest.timeout_ms);

	/* Tests are listed in order in i915_*_selftests.h */
	for (; count--; st++) {
		if (!st->enabled)
			continue;

		cond_resched();
		if (signal_pending(current))
			return -EINTR;

		pr_info(DRIVER_NAME ": Running %s\n", st->name);
		if (data)
			err = st->live(data);
		else
			err = st->mock();
		if (err == -EINTR && !signal_pending(current))
			err = 0;
		if (err)
			break;
	}

	if (WARN(err > 0 || err == -ENOTTY,
		 "%s returned %d, conflicting with selftest's magic values!\n",
		 st->name, err))
		err = -1;

	return err;
}

#define run_selftests(x, data) \
	__run_selftests(#x, x##_selftests, ARRAY_SIZE(x##_selftests), data)

int i915_mock_selftests(void)
{
	int err;

	if (!i915_selftest.mock)
		return 0;

	err = run_selftests(mock, NULL);
	if (err) {
		i915_selftest.mock = err;
		return 1;
	}

	if (i915_selftest.mock < 0) {
		i915_selftest.mock = -ENOTTY;
		return 1;
	}

	return 0;
}

int i915_live_selftests(struct pci_dev *pdev)
{
	struct drm_i915_private *i915 = pdev_to_i915(pdev);
	int err;

	if (!i915_selftest.live)
		return 0;

	__wait_gsc_proxy_completed(i915);
	__wait_gsc_huc_load_completed(i915);

	err = run_selftests(live, i915);
	if (err) {
		i915_selftest.live = err;
		return err;
	}

	if (i915_selftest.live < 0) {
		i915_selftest.live = -ENOTTY;
		return 1;
	}

	return 0;
}

int i915_perf_selftests(struct pci_dev *pdev)
{
	struct drm_i915_private *i915 = pdev_to_i915(pdev);
	int err;

	if (!i915_selftest.perf)
		return 0;

	__wait_gsc_proxy_completed(i915);
	__wait_gsc_huc_load_completed(i915);

	err = run_selftests(perf, i915);
	if (err) {
		i915_selftest.perf = err;
		return err;
	}

	if (i915_selftest.perf < 0) {
		i915_selftest.perf = -ENOTTY;
		return 1;
	}

	return 0;
}

static bool apply_subtest_filter(const char *caller, const char *name)
{
	char *filter, *sep, *tok;
	bool result = true;

	filter = kstrdup(i915_selftest.filter, GFP_KERNEL);
	for (sep = filter; (tok = strsep(&sep, ","));) {
		bool allow = true;
		char *sl;

		if (*tok == '!') {
			allow = false;
			tok++;
		}

		if (*tok == '\0')
			continue;

		sl = strchr(tok, '/');
		if (sl) {
			*sl++ = '\0';
			if (strcmp(tok, caller)) {
				if (allow)
					result = false;
				continue;
			}
			tok = sl;
		}

		if (strcmp(tok, name)) {
			if (allow)
				result = false;
			continue;
		}

		result = allow;
		break;
	}
	kfree(filter);

	return result;
}

int __i915_nop_setup(void *data)
{
	return 0;
}

int __i915_nop_teardown(int err, void *data)
{
	return err;
}

int __i915_live_setup(void *data)
{
	struct drm_i915_private *i915 = data;

	/* The selftests expect an idle system */
	if (intel_gt_pm_wait_for_idle(to_gt(i915)))
		return -EIO;

	return intel_gt_terminally_wedged(to_gt(i915));
}

int __i915_live_teardown(int err, void *data)
{
	struct drm_i915_private *i915 = data;

	if (igt_flush_test(i915))
		err = -EIO;

	i915_gem_drain_freed_objects(i915);

	return err;
}

int __intel_gt_live_setup(void *data)
{
	struct intel_gt *gt = data;

	/* The selftests expect an idle system */
	if (intel_gt_pm_wait_for_idle(gt))
		return -EIO;

	return intel_gt_terminally_wedged(gt);
}

int __intel_gt_live_teardown(int err, void *data)
{
	struct intel_gt *gt = data;

	if (igt_flush_test(gt->i915))
		err = -EIO;

	i915_gem_drain_freed_objects(gt->i915);

	return err;
}

int __i915_subtests(const char *caller,
		    int (*setup)(void *data),
		    int (*teardown)(int err, void *data),
		    const struct i915_subtest *st,
		    unsigned int count,
		    void *data)
{
	int err;

	for (; count--; st++) {
		cond_resched();
		if (signal_pending(current))
			return -EINTR;

		if (!apply_subtest_filter(caller, st->name))
			continue;

		err = setup(data);
		if (err) {
			pr_err(DRIVER_NAME "/%s: setup failed for %s\n",
			       caller, st->name);
			return err;
		}

		pr_info(DRIVER_NAME ": Running %s/%s\n", caller, st->name);
		GEM_TRACE("Running %s/%s\n", caller, st->name);

		err = teardown(st->func(data), data);
		if (err && err != -EINTR) {
			pr_err(DRIVER_NAME "/%s: %s failed with error %d\n",
			       caller, st->name, err);
			return err;
		}
	}

	return 0;
}

bool __igt_timeout(unsigned long timeout, const char *fmt, ...)
{
	va_list va;

	if (!signal_pending(current)) {
		cond_resched();
		if (time_before(jiffies, timeout))
			return false;
	}

	if (fmt) {
		va_start(va, fmt);
		vprintk(fmt, va);
		va_end(va);
	}

	return true;
}

void igt_hexdump(const void *buf, size_t len)
{
	const size_t rowsize = 8 * sizeof(u32);
	const void *prev = NULL;
	bool skip = false;
	size_t pos;

	for (pos = 0; pos < len; pos += rowsize) {
		char line[128];

		if (prev && !memcmp(prev, buf + pos, rowsize)) {
			if (!skip) {
				pr_info("*\n");
				skip = true;
			}
			continue;
		}

		WARN_ON_ONCE(hex_dump_to_buffer(buf + pos, len - pos,
						rowsize, sizeof(u32),
						line, sizeof(line),
						false) >= sizeof(line));
		pr_info("[%04zx] %s\n", pos, line);

		prev = buf + pos;
		skip = false;
	}
}

module_param_named(st_random_seed, i915_selftest.random_seed, uint, 0400);
module_param_named(st_timeout, i915_selftest.timeout_ms, uint, 0400);
module_param_named(st_filter, i915_selftest.filter, charp, 0400);

module_param_named_unsafe(mock_selftests, i915_selftest.mock, int, 0400);
MODULE_PARM_DESC(mock_selftests, "Run selftests before loading, using mock hardware (0:disabled [default], 1:run tests then load driver, -1:run tests then leave dummy module)");

module_param_named_unsafe(live_selftests, i915_selftest.live, int, 0400);
MODULE_PARM_DESC(live_selftests, "Run selftests after driver initialisation on the live system (0:disabled [default], 1:run tests then continue, -1:run tests then exit module)");

module_param_named_unsafe(perf_selftests, i915_selftest.perf, int, 0400);
MODULE_PARM_DESC(perf_selftests, "Run performance orientated selftests after driver initialisation on the live system (0:disabled [default], 1:run tests then continue, -1:run tests then exit module)");