[linux-2.6-block.git] / drivers / gpu / drm / i915 / i915_utils.c

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2019 Intel Corporation
 */

#include <drm/drm_drv.h>

#include "i915_drv.h"
#include "i915_utils.h"

#define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."

void
__i915_printk(struct drm_i915_private *dev_priv, const char *level,
	      const char *fmt, ...)
{
	static bool shown_bug_once;
	struct device *kdev = dev_priv->drm.dev;
	bool is_error = level[1] <= KERN_ERR[1];
	bool is_debug = level[1] == KERN_DEBUG[1];
	struct va_format vaf;
	va_list args;

	if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
		return;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	if (is_error)
		dev_printk(level, kdev, "%pV", &vaf);
	else
		dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
			   __builtin_return_address(0), &vaf);

	va_end(args);

	if (is_error && !shown_bug_once) {
		/*
		 * Ask the user to file a bug report for the error, except
		 * if they may have caused the bug by fiddling with unsafe
		 * module parameters.
		 */
		if (!test_taint(TAINT_USER))
			dev_notice(kdev, "%s", FDO_BUG_MSG);
		shown_bug_once = true;
	}
}

void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
{
	__i915_printk(i915, KERN_NOTICE, "CI tainted:%#x by %pS\n",
		      taint, (void *)_RET_IP_);

	/* Failures that occur during fault injection testing are expected */
	if (!i915_error_injected())
		__add_taint_for_CI(taint);
}

#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
static unsigned int i915_probe_fail_count;

int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
			      const char *func, int line)
{
	if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
		return 0;

	if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
		return 0;

	__i915_printk(i915, KERN_INFO,
		      "Injecting failure %d at checkpoint %u [%s:%d]\n",
		      err, i915_modparams.inject_probe_failure, func, line);
	i915_modparams.inject_probe_failure = 0;
	return err;
}

bool i915_error_injected(void)
{
	return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
}

#endif

void cancel_timer(struct timer_list *t)
{
	if (!timer_active(t))
		return;

	del_timer(t);
	WRITE_ONCE(t->expires, 0);
}

void set_timer_ms(struct timer_list *t, unsigned long timeout)
{
	if (!timeout) {
		cancel_timer(t);
		return;
	}

	timeout = msecs_to_jiffies(timeout);

	/*
	 * Paranoia to make sure the compiler computes the timeout before
	 * loading 'jiffies' as jiffies is volatile and may be updated in
	 * the background by a timer tick. All to reduce the complexity
	 * of the addition and reduce the risk of losing a jiffie.
	 */
	barrier();

	/* Keep t->expires = 0 reserved to indicate a canceled timer. */
	mod_timer(t, jiffies + timeout ?: 1);
}
Commit	Line	Data
358c855c JN	1	// SPDX-License-Identifier: MIT
	2	/*
	3	* Copyright © 2019 Intel Corporation
	4	*/
	5
	6	#include <drm/drm_drv.h>
	7
	8	#include "i915_drv.h"
	9	#include "i915_utils.h"
	10
ddae4d7a	11	#define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
358c855c JN	12
	13	void
	14	__i915_printk(struct drm_i915_private dev_priv, const char level,
	15	const char *fmt, ...)
	16	{
	17	static bool shown_bug_once;
	18	struct device *kdev = dev_priv->drm.dev;
	19	bool is_error = level[1] <= KERN_ERR[1];
	20	bool is_debug = level[1] == KERN_DEBUG[1];
	21	struct va_format vaf;
	22	va_list args;
	23
bdbf43d7	24	if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
358c855c JN	25	return;
	26
	27	va_start(args, fmt);
	28
	29	vaf.fmt = fmt;
	30	vaf.va = &args;
	31
	32	if (is_error)
	33	dev_printk(level, kdev, "%pV", &vaf);
	34	else
	35	dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
	36	__builtin_return_address(0), &vaf);
	37
	38	va_end(args);
	39
	40	if (is_error && !shown_bug_once) {
	41	/*
	42	* Ask the user to file a bug report for the error, except
	43	* if they may have caused the bug by fiddling with unsafe
	44	* module parameters.
	45	*/
	46	if (!test_taint(TAINT_USER))
	47	dev_notice(kdev, "%s", FDO_BUG_MSG);
	48	shown_bug_once = true;
	49	}
	50	}
	51
65706203 MW	52	void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
	53	{
	54	__i915_printk(i915, KERN_NOTICE, "CI tainted:%#x by %pS\n",
	55	taint, (void *)_RET_IP_);
fcab594a MW	56
	57	/* Failures that occur during fault injection testing are expected */
	58	if (!i915_error_injected())
	59	__add_taint_for_CI(taint);
65706203 MW	60	}
65706203 MW	61
358c855c JN	62	#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
	63	static unsigned int i915_probe_fail_count;
	64
dd6e38df JK	65	int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
dd6e38df JK	66	const char *func, int line)
358c855c	67	{
4ec37538	68	if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
358c855c JN	69	return 0;
358c855c JN	70
4ec37538	71	if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
358c855c JN	72	return 0;
	73
	74	__i915_printk(i915, KERN_INFO,
	75	"Injecting failure %d at checkpoint %u [%s:%d]\n",
4ec37538 JK	76	err, i915_modparams.inject_probe_failure, func, line);
4ec37538 JK	77	i915_modparams.inject_probe_failure = 0;
358c855c JN	78	return err;
	79	}
	80
	81	bool i915_error_injected(void)
	82	{
4ec37538	83	return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
358c855c JN	84	}
	85
	86	#endif
3a7a92ab CW	87
	88	void cancel_timer(struct timer_list *t)
	89	{
c185a16e	90	if (!timer_active(t))
3a7a92ab CW	91	return;
	92
	93	del_timer(t);
	94	WRITE_ONCE(t->expires, 0);
	95	}
	96
	97	void set_timer_ms(struct timer_list *t, unsigned long timeout)
	98	{
	99	if (!timeout) {
	100	cancel_timer(t);
	101	return;
	102	}
	103
f4bb45f7	104	timeout = msecs_to_jiffies(timeout);
3a7a92ab CW	105
	106	/*
	107	* Paranoia to make sure the compiler computes the timeout before
	108	* loading 'jiffies' as jiffies is volatile and may be updated in
	109	* the background by a timer tick. All to reduce the complexity
	110	* of the addition and reduce the risk of losing a jiffie.
	111	*/
	112	barrier();
	113
bfae03fe CW	114	/* Keep t->expires = 0 reserved to indicate a canceled timer. */
bfae03fe CW	115	mod_timer(t, jiffies + timeout ?: 1);
3a7a92ab	116	}