kernel.git/arch/powerpc/kernel/prom.c, branch linux-4.11.y

powerpc: Fix booting P9 hash with CONFIG_PPC_RADIX_MMU=N

2017-06-07T10:10:06Z

commit d957fb4d173647640a2b83e7c7e56a580e7fc7e7 upstream. Currently if you disable CONFIG_PPC_RADIX_MMU you'll crash on boot on a P9. This is because we still set MMU_FTR_TYPE_RADIX via ibm,pa-features and MMU_FTR_TYPE_RADIX is what's used for code patching in much of the asm code (ie. slb_miss_realmode) This patch fixes the problem by stopping MMU_FTR_TYPE_RADIX from being set from ibm.pa-features. We may eventually end up removing the CONFIG_PPC_RADIX_MMU option completely but until then this fixes the issue. Fixes: 17a3dd2f5fc7 ("powerpc/mm/radix: Use firmware feature to enable Radix MMU") Signed-off-by: Michael Neuling Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman

powerpc: Change places using CONFIG_KEXEC to use CONFIG_KEXEC_CORE instead.

2016-11-30T12:15:11Z

Commit 2965faa5e03d ("kexec: split kexec_load syscall from kexec core code") introduced CONFIG_KEXEC_CORE so that CONFIG_KEXEC means whether the kexec_load system call should be compiled-in and CONFIG_KEXEC_FILE means whether the kexec_file_load system call should be compiled-in. These options can be set independently from each other. Since until now powerpc only supported kexec_load, CONFIG_KEXEC and CONFIG_KEXEC_CORE were synonyms. That is not the case anymore, so we need to make a distinction. Almost all places where CONFIG_KEXEC was being used should be using CONFIG_KEXEC_CORE instead, since kexec_file_load also needs that code compiled in. Signed-off-by: Thiago Jung Bauermann Signed-off-by: Michael Ellerman

powerpc/64: Used named initialisers for ibm_pa_features

2016-11-18T12:02:19Z

The ibm_pa_features array consists of structures that describe which bit and byte in the ibm,pa-features property toggles one or more flags in either the CPU, MMU, or user visible feature flags. Each one consists of 7 values, which are all unsigned long, int or char, meaning the compiler gives us no warning if we assign the wrong values to the wrong elements. In fact we have had a bug here in the past, where we were setting incorrect bits, see commit 6997e57d693b ("powerpc: scan_features() updates incorrect bits for REAL_LE"). So switch to using named initialisers for the structure elements, to reduce the likelihood of future bugs, and hopefully improve readability also. Signed-off-by: Michael Ellerman Reviewed-by: Balbir Singh

powerpc/mm: Make MMU_FTR_RADIX a MMU family feature

2016-08-01T01:14:57Z

MMU feature bits are defined such that we use the lower half to present MMU family features. Remove the strict split of half and also move Radix to a mmu family feature. Radix introduce a new MMU model and strictly speaking it is a new MMU family. This also free up bits which can be used for individual features later. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc/mm: Move disable_radix handling into mmu_early_init_devtree()

2016-08-01T01:14:53Z

Move the handling of the disable_radix command line argument into the newly created mmu_early_init_devtree(). It's an MMU option so it's preferable to have it in an mm related file, and it also means platforms that don't support radix don't have to carry the code. Signed-off-by: Michael Ellerman

powerpc/mm: Add mmu_early_init_devtree()

2016-08-01T01:14:53Z

Empty for now, but we'll add to it in the next patch. Signed-off-by: Michael Ellerman

powerpc/64: Move MMU backend selection out of platform code

2016-07-21T08:56:38Z

We move it into early_mmu_init() based on firmware features. For PS3, we have to move the setting of these into early_init_devtree(). Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc: Move FW feature probing out of pseries probe()

2016-07-21T08:56:13Z

We move the function itself to pseries/firmware.c and call it along with almost all other flat device-tree parsers from early_init_devtree() Signed-off-by: Benjamin Herrenschmidt [mpe: Move #ifdefs into the header by providing pseries_probe_fw_features()] Signed-off-by: Michael Ellerman

powerpc/mm/radix: Add a kernel command line to disable radix

2016-07-17T06:42:55Z

This patch adds the kernel command line disable_radix which disable the radix MMU mode even if firmware indicates radix support via ibm,pa-features device tree node. This helps in testing different MMU mode easily. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman

powerpc: Move epapr_paravirt_early_init() to early_init_devtree()

2016-07-11T10:09:40Z

The function is called by both 32-bit and 64-bit early setup right after early_init_devtree(). All it does is run yet another early DT parser which is precisely what early_init_devtree() is about, so move it in there. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman