linux-dev/arch/powerpc/platforms/pseries/ras.c, branch linus/master

powerpc/mce: Avoid using irq_work_queue() in realmode

2022-03-07T13:05:00Z

In realmode mce handler we use irq_work_queue() to defer the processing of mce events, irq_work_queue() can only be called when translation is enabled because it touches memory outside RMA, hence we enable translation before calling irq_work_queue and disable on return, though it is not safe to do in realmode. To avoid this, program the decrementer and call the event processing functions from timer handler. Signed-off-by: Ganesh Goudar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220120121931.517974-1-ganeshgr@linux.ibm.com

powerpc/pseries: Parse control memory access error

2022-03-07T13:04:59Z

Add support to parse and log control memory access error for pseries. These changes are made according to PAPR v2.11 10.3.2.2.12. Signed-off-by: Ganesh Goudar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220107141428.67862-1-ganeshgr@linux.ibm.com

powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU

2021-12-09T11:41:13Z

Compiling out hash support code when CONFIG_PPC_64S_HASH_MMU=n saves 128kB kernel image size (90kB text) on powernv_defconfig minus KVM, 350kB on pseries_defconfig minus KVM, 40kB on a tiny config. Signed-off-by: Nicholas Piggin [mpe: Fixup defined(ARCH_HAS_MEMREMAP_COMPAT_ALIGN), which needs CONFIG. Fix radix_enabled() use in setup_initial_memory_limit(). Add some stubs to reduce number of ifdefs.] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211201144153.2456614-18-npiggin@gmail.com

powerpc: Refactor verification of MSR_RI

2021-08-26T11:21:07Z

40x and BOOKE don't have MSR_RI therefore all tests involving MSR_RI may be problematic on those plateforms. Create helpers to check or set MSR_RI in regs, and use them in common code. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/c2fb93708196734f4176dda334aaa3055f213b89.1629707037.git.christophe.leroy@csgroup.eu

powerpc/64s: avoid reloading (H)SRR registers if they are still valid

2021-06-24T14:06:55Z

When an interrupt is taken, the SRR registers are set to return to where it left off. Unless they are modified in the meantime, or the return address or MSR are modified, there is no need to reload these registers when returning from interrupt. Introduce per-CPU flags that track the validity of SRR and HSRR registers. These are cleared when returning from interrupt, when using the registers for something else (e.g., OPAL calls), when adjusting the return address or MSR of a context, and when context switching (which changes the return address and MSR). This improves the performance of interrupt returns. Signed-off-by: Nicholas Piggin [mpe: Fold in fixup patch from Nick] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210617155116.2167984-5-npiggin@gmail.com

powerpc/pseries/ras: Delete a redundant condition branch

2021-05-23T10:51:34Z

The statement of the last "if (xxx)" branch is the same as the "else" branch. Delete it to simplify code. No functional change. Signed-off-by: Zhen Lei Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210510131924.3907-1-thunder.leizhen@huawei.com

powerpc/pseries/mce: Fix a typo in error type assignment

2021-04-20T04:22:23Z

The error type is ICACHE not DCACHE, for case MCE_ERROR_TYPE_ICACHE. Signed-off-by: Ganesh Goudar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210416125750.49550-1-ganeshgr@linux.ibm.com

powerpc/pseries/mce: restore msr before returning from handler

2021-02-08T13:10:50Z

The pseries real-mode machine check handler can enable the MMU, and return from the handler with the MMU still enabled. This works, but real-mode handler wrapper exit handlers want to rely on the MMU being in real-mode. So change the pseries handler to restore the MSR after it has finished virtual mode tasks. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1612702361.lm7fqo56re.astroid@bobo.none

powerpc: introduce die_mce

2021-02-08T13:02:11Z

As explained by commit daf00ae71dad ("powerpc/traps: restore recoverability of machine_check interrupts"), die() can't be called from within nmi_enter to nicely kill a process context that was interrupted. nmi_exit must be called first. This adds a function die_mce which takes care of this for machine check handlers. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210130130852.2952424-24-npiggin@gmail.com

powerpc/pseries/ras: Make init_ras_hotplug_IRQ() static

2021-01-30T00:39:28Z

init_ras_hotplug_IRQ() is a local routine used by a machine init call and it doesn't need to be external. It fixes this W=1 compile error: ../arch/powerpc/platforms/pseries/ras.c:125:12: error: no previous prototype for ‘init_ras_hotplug_IRQ’ [-Werror=missing-prototypes] 125 | int __init init_ras_hotplug_IRQ(void) | ^~~~~~~~~~~~~~~~~~~~ Fixes: c9dccf1d074a ("powerpc/pseries: Enable RAS hotplug events later") Signed-off-by: Cédric Le Goater Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210104143206.695198-5-clg@kaod.org