BMC/Intel-BMC/linux.git/arch/powerpc/platforms/pseries/ras.c, branch dev

powerpc/pseries: All events of EPOW_SYSTEM_SHUTDOWN must initiate shutdown

2015-01-23T00:17:30+00:00

The current handling of EPOW_SHUTDOWN_ON_UPS event does not shutdown the system after logging the message. All the events of EPOW_SYSTEM_SHUTDOWN action code (EPOW_SHUTDOWN_ON_UPS is a part of it) must initiate system shutdown as per the SPAPR spec. If the LPAR does not shutdown after receiving this rtas based event, it will expose itself to a forced abrupt shutdown initiated by the platform firmware. This patch fixes the situation. Signed-off-by: Anshuman Khandual Signed-off-by: Michael Ellerman

powerpc: Replace __get_cpu_var uses

2014-11-03T01:12:32+00:00

This still has not been merged and now powerpc is the only arch that does not have this change. Sorry about missing linuxppc-dev before. V2->V2 - Fix up to work against 3.18-rc1 __get_cpu_var() is used for multiple purposes in the kernel source. One of them is address calculation via the form &__get_cpu_var(x). This calculates the address for the instance of the percpu variable of the current processor based on an offset. Other use cases are for storing and retrieving data from the current processors percpu area. __get_cpu_var() can be used as an lvalue when writing data or on the right side of an assignment. __get_cpu_var() is defined as : __get_cpu_var() always only does an address determination. However, store and retrieve operations could use a segment prefix (or global register on other platforms) to avoid the address calculation. this_cpu_write() and this_cpu_read() can directly take an offset into a percpu area and use optimized assembly code to read and write per cpu variables. This patch converts __get_cpu_var into either an explicit address calculation using this_cpu_ptr() or into a use of this_cpu operations that use the offset. Thereby address calculations are avoided and less registers are used when code is generated. At the end of the patch set all uses of __get_cpu_var have been removed so the macro is removed too. The patch set includes passes over all arches as well. Once these operations are used throughout then specialized macros can be defined in non -x86 arches as well in order to optimize per cpu access by f.e. using a global register that may be set to the per cpu base. Transformations done to __get_cpu_var() 1. Determine the address of the percpu instance of the current processor. DEFINE_PER_CPU(int, y); int *x = &__get_cpu_var(y); Converts to int *x = this_cpu_ptr(&y); 2. Same as #1 but this time an array structure is involved. DEFINE_PER_CPU(int, y[20]); int *x = __get_cpu_var(y); Converts to int *x = this_cpu_ptr(y); 3. Retrieve the content of the current processors instance of a per cpu variable. DEFINE_PER_CPU(int, y); int x = __get_cpu_var(y) Converts to int x = __this_cpu_read(y); 4. Retrieve the content of a percpu struct DEFINE_PER_CPU(struct mystruct, y); struct mystruct x = __get_cpu_var(y); Converts to memcpy(&x, this_cpu_ptr(&y), sizeof(x)); 5. Assignment to a per cpu variable DEFINE_PER_CPU(int, y) __get_cpu_var(y) = x; Converts to __this_cpu_write(y, x); 6. Increment/Decrement etc of a per cpu variable DEFINE_PER_CPU(int, y); __get_cpu_var(y)++ Converts to __this_cpu_inc(y) Cc: Benjamin Herrenschmidt CC: Paul Mackerras Signed-off-by: Christoph Lameter [mpe: Fix build errors caused by set/or_softirq_pending(), and rework assignment in __set_breakpoint() to use memcpy().] Signed-off-by: Michael Ellerman

powerpc: Make a bunch of things static

2014-09-25T13:14:41+00:00

Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

powerpc/pseries: Switch pseries drivers to use machine_xxx_initcall()

2014-07-28T04:11:26+00:00

A lot of the code in platforms/pseries is using non-machine initcalls. That means if a kernel built with pseries support runs on another platform, for example powernv, the initcalls will still run. Most of these cases are OK, though sometimes only due to luck. Some were having more effect: * hcall_inst_init - Checking FW_FEATURE_LPAR which is set on ps3 & celleb. * mobility_sysfs_init - created sysfs files unconditionally - but no effect due to ENOSYS from rtas_ibm_suspend_me() * apo_pm_init - created sysfs, allows write - nothing checks the value written to though * alloc_dispatch_log_kmem_cache - creating kmem_cache on non-pseries machines Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt

powerpc/le: Enable RTAS events support

2014-04-07T00:33:12+00:00

The current kernel code assumes big endian and parses RTAS events all wrong. The most visible effect is that we cannot honor EPOW events, meaning, for example, we cannot shut down a guest properly from the hypervisor. This new patch is largely inspired by Nathan's work: we get rid of all the bit fields in the RTAS event structures (even the unused ones, for consistency). We also introduce endian safe accessors for the fields used by the kernel (trivial rtas_error_type() accessor added for consistency). Cc: Nathan Fontenot Signed-off-by: Greg Kurz Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix the corrupt r3 error during MCE handling.

2013-07-24T04:18:45+00:00

During Machine Check interrupt on pseries platform, R3 generally points to memory region inside RTAS (FWNMI) area. We see r3 corruption because when RTAS delivers the machine check exception it passes the address inside FWNMI area with the top most bit set. This patch fixes this issue by masking top two bit in machine check exception handler. Signed-off-by: Mahesh Salgaonkar Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Use 'true' instead of '1' for orderly_poweroff

2013-06-20T07:04:26+00:00

orderly_poweroff is expecting a bool parameter, so use 'true' instead '1' Signed-off-by: liguang Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Cut down on enthusiastic use of defines in RAS code

2012-03-28T00:32:01+00:00

So many defines for such a little file. Most of them can go. Also remove the single entry changelog, we have git for that. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Clean up ras_error_interrupt code

2012-03-28T00:32:00+00:00

The RAS error interrupt is no longer used but we may as well mirror the changes we made to the EPOW interrupt. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

powerpc/pseries: Remove RTAS_POWERMGM_EVENTS

2012-03-28T00:32:00+00:00

IBM bit 2 in the rtas event-scan and check-exception calls is marked reserved in the PAPR, so remove it from our RAS code. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt