kernel/arch/powerpc/include/asm/cputable.h, branch linux-5.2.y

powerpc/83xx: handle machine check caused by watchdog timer

2018-12-22T02:56:41Z

When the watchdog timer is set in interrupt mode, it causes a machine check when it times out. The purpose of this mode is to ease debugging, not to crash the kernel and reboot the machine. This patch implements a special handling for that, in order to not crash the kernel if the watchdog times out while in interrupt or within the idle task. Signed-off-by: Christophe Leroy [scottwood: added missing #include] Signed-off-by: Scott Wood

powerpc/mm: add exec protection on powerpc 603

2018-12-19T07:56:32Z

The 603 doesn't have a HASH table, TLB misses are handled by software. It is then possible to generate page fault when _PAGE_EXEC is not set like in nohash/32. There is one "reserved" PTE bit available, this patch uses it for _PAGE_EXEC. In order to support it, set_pte_filter() and set_access_flags_filter() are made common, and the handling is made dependent on MMU_FTR_HPTE_TABLE Signed-off-by: Christophe Leroy Reviewed-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc: clean inclusions of asm/feature-fixups.h

2018-07-30T12:48:17Z

files not using feature fixup don't need asm/feature-fixups.h files using feature fixup need asm/feature-fixups.h Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc: move ASM_CONST and stringify_in_c() into asm-const.h

2018-07-30T12:48:16Z

This patch moves ASM_CONST() and stringify_in_c() into dedicated asm-const.h, then cleans all related inclusions. Signed-off-by: Christophe Leroy [mpe: asm-compat.h should include asm-const.h] Signed-off-by: Michael Ellerman

Merge branch 'topic/ppc-kvm' into next

2018-07-19T04:37:57Z

Merge in some commits we're sharing with the KVM tree. I manually propagated the change from commit d3d4ffaae439 ("powerpc/powernv/ioda2: Reduce upper limit for DMA window size") into pci-ioda-tce.c. Conflicts: arch/powerpc/include/asm/cputable.h arch/powerpc/platforms/powernv/pci-ioda.c arch/powerpc/platforms/powernv/pci.h

powerpc/64s: Remove POWER9 DD1 support

2018-07-16T01:37:21Z

POWER9 DD1 was never a product. It is no longer supported by upstream firmware, and it is not effectively supported in Linux due to lack of testing. Signed-off-by: Nicholas Piggin Reviewed-by: Michael Ellerman [mpe: Remove arch_make_huge_pte() entirely] Signed-off-by: Michael Ellerman

powerpc: Remove Power8 DD1 from cputable

2018-07-12T11:08:09Z

This was added to support an early version of Power8 that did not have working doorbells. These machines were not publicly available, and all of the internal users have long since upgraded. Signed-off-by: Joel Stanley Signed-off-by: Michael Ellerman

powerpc: Add TIDR CPU feature for POWER9

2018-06-03T10:40:31Z

This patch adds a CPU feature bit to show whether the CPU has the TIDR register available, enabling as_notify/wait in userspace. Signed-off-by: Alastair D'Silva Reviewed-by: Frederic Barrat Reviewed-by: Andrew Donnellan Signed-off-by: Michael Ellerman

powerpc/64s: Fix CPU_FTRS_ALWAYS vs DT CPU features

2018-04-13T13:51:44Z

The cpu_has_feature() mechanism has an optimisation where at build time we construct a mask of the CPU feature bits that will always be true for the given .config, based on the platform/bitness/etc. that we are building for. That is incompatible with DT CPU features, where the set of CPU features is dependent on feature flags that are given to us by firmware. The result is that some feature bits can not be *disabled* by DT CPU features. Or more accurately, they can be disabled but they will still appear in the ALWAYS mask, meaning cpu_has_feature() will always return true for them. In the past this hasn't really been a problem because on Book3S 64 (where we support DT CPU features), the set of ALWAYS bits has been very small. That was because we always built for POWER4 and later, meaning the set of common bits was small. The only bit that could be cleared by DT CPU features that was also in the ALWAYS mask was CPU_FTR_NODSISRALIGN, and that was only used in the alignment handler to create a fake DSISR. That code was itself deleted in 31bfdb036f12 ("powerpc: Use instruction emulation infrastructure to handle alignment faults") (Sep 2017). However the set of ALWAYS features changed with the recent commit db5ae1c155af ("powerpc/64s: Refine feature sets for little endian builds") which restricted the set of feature flags when building little endian to Power7 or later. That caused the ALWAYS mask to become much larger for little endian builds. The result is that the following feature bits can currently not be *disabled* by DT CPU features: CPU_FTR_REAL_LE, CPU_FTR_MMCRA, CPU_FTR_CTRL, CPU_FTR_SMT, CPU_FTR_PURR, CPU_FTR_SPURR, CPU_FTR_DSCR, CPU_FTR_PKEY, CPU_FTR_VMX_COPY, CPU_FTR_CFAR, CPU_FTR_HAS_PPR. To fix it we need to mask the set of ALWAYS features with the base set of DT CPU features, ie. the features that are always enabled by DT CPU features. That way there are no bits in the ALWAYS mask that are not also always set by DT CPU features. Fixes: db5ae1c155af ("powerpc/64s: Refine feature sets for little endian builds") Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman

powerpc/64s: Fix POWER9 DD2.2 and above in cputable features

2018-04-05T06:28:13Z

The CPU_FTR_POWER9_DD2_1 flag is intended to be set for DD2.1 and above (which is what the dt_cpu_ftrs setup does). Fix cputable for DD2.2 to match. This came about due to patches b5af4f279323 ("powerpc: Add CPU feature bits for TM bug workarounds on POWER9 v2.2"), and 9e9626ed3a4a ("powerpc/64s: Fix POWER9 DD2.2 and above in DT CPU features") being in-flight at once. The latter patch fixed dt_cpu_ftrs like this one does. The former changed cputable to match dt_cpu_ftrs. Fixes: b5af4f279323 ("powerpc: Add CPU feature bits for TM bug workarounds on POWER9 v2.2") Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman