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ARM: 8847/1: pm: fix HYP/SVC mode mismatch when MCPM is used 

MCPM does a soft reset of the CPUs and uses common cpu_resume() routine to
perform low-level platform initialization. This results in a try to install
HYP stubs for the second time for each CPU and results in false HYP/SVC
mode mismatch detection. The HYP stubs are already installed at the
beginning of the kernel initialization on the boot CPU (head.S) or in the
secondary_startup() for other CPUs. To fix this issue MCPM code should use
a cpu_resume() routine without HYP stubs installation.

This change fixes HYP/SVC mode mismatch on Samsung Exynos5422-based Odroid
XU3/XU4/HC1 boards.

Fixes: 3721924c81 ("ARM: 8081/1: MCPM: provide infrastructure to allow for MCPM loopback")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Marek Szyprowski 2019-02-18 09:31:41 +01:00 committed by Russell King
parent 74ffe79ae5
commit ca70ea43f8
3 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/common/mcpm_entry.c
View File

@ -381,7 +381,7 @@ static int __init nocache_trampoline(unsigned long _arg)
unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
phys_reset_t phys_reset;
mcpm_set_entry_vector(cpu, cluster, cpu_resume);
mcpm_set_entry_vector(cpu, cluster, cpu_resume_no_hyp);
setup_mm_for_reboot();
__mcpm_cpu_going_down(cpu, cluster);

1
arch/arm/include/asm/suspend.h
View File

@ -10,6 +10,7 @@ struct sleep_save_sp {
};
extern void cpu_resume(void);
extern void cpu_resume_no_hyp(void);
extern void cpu_resume_arm(void);
extern int cpu_suspend(unsigned long, int (*)(unsigned long));

12
arch/arm/kernel/sleep.S
View File

@ -120,6 +120,14 @@ ENDPROC(cpu_resume_after_mmu)
.text
.align
#ifdef CONFIG_MCPM
.arm
THUMB( .thumb )
ENTRY(cpu_resume_no_hyp)
ARM_BE8(setend be) @ ensure we are in BE mode
b no_hyp
#endif
#ifdef CONFIG_MMU
.arm
ENTRY(cpu_resume_arm)
@ -135,6 +143,7 @@ ARM_BE8(setend be) @ ensure we are in BE mode
bl __hyp_stub_install_secondary
#endif
safe_svcmode_maskall r1
no_hyp:
mov r1, #0
ALT_SMP(mrc p15, 0, r0, c0, c0, 5)
ALT_UP_B(1f)
@ -163,6 +172,9 @@ ENDPROC(cpu_resume)
#ifdef CONFIG_MMU
ENDPROC(cpu_resume_arm)
#endif
#ifdef CONFIG_MCPM
ENDPROC(cpu_resume_no_hyp)
#endif
.align 2