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Maíra Canal
421cf7ccfc
drm_timeout_abs_to_jiffies() covers the drivers whose wait UAPI takes an absolute deadline, but there is no equivalent for the drivers that express a wait as a duration. Drivers such as i915 and v3d convert the value themselves. Converting a nanosecond duration to jiffies needs some care. nsecs_to_jiffies() returns unsigned long, so on 32-bit a large userspace-supplied timeout overflows its range and is silently truncated. i915 already handles both cases in a local helper, which v3d has a copy of. Add the same conversion to the core, so that it is available to any driver and both copies can be dropped. Differently from drm_timeout_abs_to_jiffies(), the new function enforces that a timeout in jiffies is a positive value and therefore, returns an unsigned value. Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://patch.msgid.link/20260915-drm-timeout-helpers-v3-2-f2ae987d861f@igalia.com Signed-off-by: Maíra Canal <mcanal@igalia.com>
18 lines
395 B
C
18 lines
395 B
C
/* SPDX-License-Identifier: MIT */
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/*
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* Function prototypes for timeout conversion helpers for wait ioctls.
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*
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* Copyright 2017 Red Hat
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* Copyright 2016 Advanced Micro Devices, Inc.
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*/
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#ifndef __DRM_TIMEOUT_H__
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#define __DRM_TIMEOUT_H__
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#include <linux/types.h>
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signed long drm_timeout_abs_to_jiffies(s64 timeout_nsec);
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unsigned long drm_timeout_rel_to_jiffies(u64 timeout_nsec);
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#endif
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