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

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

#include <linux/device.h>

#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);
}

bool i915_vtd_active(struct drm_i915_private *i915)
{
	if (device_iommu_mapped(i915->drm.dev))
		return true;

	/* Running as a guest, we assume the host is enforcing VT'd */
	return i915_run_as_guest();
}
Commit	Line	Data
358c855c JN	1	// SPDX-License-Identifier: MIT
	2	/*
	3	* Copyright © 2019 Intel Corporation
	4	*/
	5
a7f46d5b TU	6	#include <linux/device.h>
a7f46d5b TU	7
358c855c JN	8	#include <drm/drm_drv.h>
	9
	10	#include "i915_drv.h"
	11	#include "i915_utils.h"
	12
ddae4d7a	13	#define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
358c855c JN	14
	15	void
	16	__i915_printk(struct drm_i915_private dev_priv, const char level,
	17	const char *fmt, ...)
	18	{
	19	static bool shown_bug_once;
	20	struct device *kdev = dev_priv->drm.dev;
	21	bool is_error = level[1] <= KERN_ERR[1];
	22	bool is_debug = level[1] == KERN_DEBUG[1];
	23	struct va_format vaf;
	24	va_list args;
	25
bdbf43d7	26	if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
358c855c JN	27	return;
	28
	29	va_start(args, fmt);
	30
	31	vaf.fmt = fmt;
	32	vaf.va = &args;
	33
	34	if (is_error)
	35	dev_printk(level, kdev, "%pV", &vaf);
	36	else
	37	dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
	38	__builtin_return_address(0), &vaf);
	39
	40	va_end(args);
	41
	42	if (is_error && !shown_bug_once) {
	43	/*
	44	* Ask the user to file a bug report for the error, except
	45	* if they may have caused the bug by fiddling with unsafe
	46	* module parameters.
	47	*/
	48	if (!test_taint(TAINT_USER))
	49	dev_notice(kdev, "%s", FDO_BUG_MSG);
	50	shown_bug_once = true;
	51	}
	52	}
	53
65706203 MW	54	void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
	55	{
	56	__i915_printk(i915, KERN_NOTICE, "CI tainted:%#x by %pS\n",
	57	taint, (void *)_RET_IP_);
fcab594a MW	58
	59	/* Failures that occur during fault injection testing are expected */
	60	if (!i915_error_injected())
	61	__add_taint_for_CI(taint);
65706203 MW	62	}
65706203 MW	63
358c855c JN	64	#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
	65	static unsigned int i915_probe_fail_count;
	66
dd6e38df JK	67	int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
dd6e38df JK	68	const char *func, int line)
358c855c	69	{
4ec37538	70	if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
358c855c JN	71	return 0;
358c855c JN	72
4ec37538	73	if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
358c855c JN	74	return 0;
	75
	76	__i915_printk(i915, KERN_INFO,
	77	"Injecting failure %d at checkpoint %u [%s:%d]\n",
4ec37538 JK	78	err, i915_modparams.inject_probe_failure, func, line);
4ec37538 JK	79	i915_modparams.inject_probe_failure = 0;
358c855c JN	80	return err;
	81	}
	82
	83	bool i915_error_injected(void)
	84	{
4ec37538	85	return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
358c855c JN	86	}
	87
	88	#endif
3a7a92ab CW	89
	90	void cancel_timer(struct timer_list *t)
	91	{
c185a16e	92	if (!timer_active(t))
3a7a92ab CW	93	return;
	94
	95	del_timer(t);
	96	WRITE_ONCE(t->expires, 0);
	97	}
	98
	99	void set_timer_ms(struct timer_list *t, unsigned long timeout)
	100	{
	101	if (!timeout) {
	102	cancel_timer(t);
	103	return;
	104	}
	105
f4bb45f7	106	timeout = msecs_to_jiffies(timeout);
3a7a92ab CW	107
	108	/*
	109	* Paranoia to make sure the compiler computes the timeout before
	110	* loading 'jiffies' as jiffies is volatile and may be updated in
	111	* the background by a timer tick. All to reduce the complexity
	112	* of the addition and reduce the risk of losing a jiffie.
	113	*/
	114	barrier();
	115
bfae03fe CW	116	/* Keep t->expires = 0 reserved to indicate a canceled timer. */
bfae03fe CW	117	mod_timer(t, jiffies + timeout ?: 1);
3a7a92ab	118	}
a7f46d5b TU	119
	120	bool i915_vtd_active(struct drm_i915_private *i915)
	121	{
	122	if (device_iommu_mapped(i915->drm.dev))
	123	return true;
	124
	125	/* Running as a guest, we assume the host is enforcing VT'd */
	126	return i915_run_as_guest();
	127	}