Martin Fäcknitz e09c9b5584 MIPS: vdso: Invalid GIC access through VDSO ... [ Upstream commit 47ce8527fb ] Accessing raw timers (currently only CLOCK_MONOTONIC_RAW) through VDSO doesn't return the correct time when using the GIC as clock source. The address of the GIC mapped page is in this case not calculated correctly. The GIC mapped page is calculated from the VDSO data by subtracting PAGE_SIZE: void *get_gic(const struct vdso_data *data) { return (void __iomem *)data - PAGE_SIZE; } However, the data pointer is not page aligned for raw clock sources. This is because the VDSO data for raw clock sources (CS_RAW = 1) is stored after the VDSO data for coarse clock sources (CS_HRES_COARSE = 0). Therefore, only the VDSO data for CS_HRES_COARSE is page aligned: +--------------------+ | | | vd[CS_RAW] | ---+ | vd[CS_HRES_COARSE] | | +--------------------+ | -PAGE_SIZE | | | | GIC mapped page | <--+ | | +--------------------+ When __arch_get_hw_counter() is called with &vd[CS_RAW], get_gic returns the wrong address (somewhere inside the GIC mapped page). The GIC counter values are not returned which results in an invalid time. Fixes: a7f4df4e21 ("MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime()") Signed-off-by: Martin Fäcknitz <faecknitz@hotsplots.de> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-07-20 16:05:59 +02:00
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clocksource.h	mips: Introduce asm/vdso/clocksource.h	2020-03-21 15:23:55 +01:00
gettimeofday.h	mips: Do not include hi and lo in clobber list for R6	2021-05-07 11:04:30 +02:00
processor.h	mips: vdso: Enable mips to use common headers	2020-03-21 15:24:02 +01:00
vdso.h	MIPS: vdso: Invalid GIC access through VDSO	2021-07-20 16:05:59 +02:00
vsyscall.h	mips: vdso: Use generic VDSO clock mode storage	2020-02-17 20:12:16 +01:00