diff options
| author | Gregory CLEMENT <gregory.clement@bootlin.com> | 2025-07-10 16:54:42 +0200 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2025-07-16 18:34:36 +0200 |
| commit | 07f8888ee7df5189e64839abb26842dc6c2da371 (patch) | |
| tree | 3a9e9e124302fff919ceec0471f1a1c791d20fe2 /arch/mips/include | |
| parent | ca943354f2ccb82bb7c73c2e8d5eb355b102f75e (diff) | |
MIPS: disable MMID when not supported by the hardware
It is possible that MMID is supported at the CPU level, but its
integration in a SoC prevents its usage. For instance, if the
System-level Interconnect (also known as Network on Chip) does not
support global invalidation, then the MMID feature is not usable. The
current implementation of MMID relies on the GINV* instructions.
This patch allows the disabling of MMID based on a device tree
property, as this issue cannot be detected at runtime.
MMID is set up very early during the boot process, even before device
tree data can be accessed. Therefore, when we determine whether MMID
needs to be disabled, some MMID setup has already been performed for
the boot CPU. Consequently, we must revert the MMID setup on the first
CPU before disabling the feature for the subsequent CPUs that will be
initialized later.
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/cpu-info.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h index a600670d00e9..fd60837ce50b 100644 --- a/arch/mips/include/asm/cpu-info.h +++ b/arch/mips/include/asm/cpu-info.h @@ -123,6 +123,7 @@ extern struct cpuinfo_mips cpu_data[]; extern void cpu_probe(void); extern void cpu_report(void); +extern void cpu_disable_mmid(void); extern const char *__cpu_name[]; #define cpu_name_string() __cpu_name[raw_smp_processor_id()] |