This patch is required for booting in the PowerNV (non-virtualized) platform in little-endian mode.
It didn't make mainline or linux-next yet, probably because it has been reposted recently [1], as an alternative to another proposed solution [2]. The reposted variant has been employed by Ubuntu [3] for some time. This patch is different for linux 3.14 and 3.15. This is the version for 3.14; the patch for 3.15 requires a straight-forward port. [1] http://patchwork.ozlabs.org/patch/350461/ [2] http://patchwork.ozlabs.org/patch/347024/ [3] http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-trusty.git;a=commit;h=d2bee7c8f95e43701daf0123bbf47af8d0136b0c Signed-off-by: Mauricio Faria de Oliveira <mauri...@linux.vnet.ibm.com> --- ...el-powernv-calls-to-support-little-endian.patch | 101 ++++++++++++++++++++ debian/patches/series | 1 + 2 files changed, 102 insertions(+), 0 deletions(-) create mode 100644 debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch diff --git a/debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch b/debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch new file mode 100644 index 0000000..b052878 --- /dev/null +++ b/debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch @@ -0,0 +1,101 @@ +Subject: powerpc/powernv: Add calls to support little endian host +From: Benjamin Herrenschmidt <b...@kernel.crashing.org> +Date: Tue, 20 May 2014 11:01:28 +1000 +Origin: http://patchwork.ozlabs.org/patch/350461/ + +When running as a powernv "host" system on P8, we need to switch +the endianness of interrupt handlers. This does it via the appropriate +call to the OPAL firmware which may result in just switching HID0:HILE +but depending on the processor version might need to do a few more +things. This call must be done early before any other processor has +been brought out of firmware. + +Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org> +Signed-off-by: Andy Whitcroft <a...@canonical.com> + +--- + +diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h +index 0394e91..a2a3d0d 100644 +--- a/arch/powerpc/include/asm/opal.h ++++ b/arch/powerpc/include/asm/opal.h +@@ -129,6 +129,7 @@ extern int opal_enter_rtas(struct rtas_args *args, + #define OPAL_LPC_READ 67 + #define OPAL_LPC_WRITE 68 + #define OPAL_RETURN_CPU 69 ++#define OPAL_REINIT_CPUS 70 + #define OPAL_FLASH_VALIDATE 76 + #define OPAL_FLASH_MANAGE 77 + #define OPAL_FLASH_UPDATE 78 +@@ -599,6 +600,11 @@ struct OpalIoPhb3ErrorData { + uint64_t pestB[OPAL_PHB3_NUM_PEST_REGS]; + }; + ++enum { ++ OPAL_REINIT_CPUS_HILE_BE = (1 << 0), ++ OPAL_REINIT_CPUS_HILE_LE = (1 << 1), ++}; ++ + typedef struct oppanel_line { + const char * line; + uint64_t line_len; +@@ -719,6 +725,7 @@ int64_t opal_pci_next_error(uint64_t phb_id, uint64_t *first_frozen_pe, + uint16_t *pci_error_type, uint16_t *severity); + int64_t opal_pci_poll(uint64_t phb_id); + int64_t opal_return_cpu(void); ++int64_t opal_reinit_cpus(uint64_t flags); + + int64_t opal_xscom_read(uint32_t gcid, uint64_t pcb_addr, __be64 *val); + int64_t opal_xscom_write(uint32_t gcid, uint64_t pcb_addr, uint64_t val); +diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S +index e780650..3abb518 100644 +--- a/arch/powerpc/platforms/powernv/opal-wrappers.S ++++ b/arch/powerpc/platforms/powernv/opal-wrappers.S +@@ -123,6 +123,7 @@ OPAL_CALL(opal_xscom_write, OPAL_XSCOM_WRITE); + OPAL_CALL(opal_lpc_read, OPAL_LPC_READ); + OPAL_CALL(opal_lpc_write, OPAL_LPC_WRITE); + OPAL_CALL(opal_return_cpu, OPAL_RETURN_CPU); ++OPAL_CALL(opal_reinit_cpus, OPAL_REINIT_CPUS); + OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE); + OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE); + OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE); +diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c +index 1c798cd..359f18a 100644 +--- a/arch/powerpc/platforms/powernv/opal.c ++++ b/arch/powerpc/platforms/powernv/opal.c +@@ -42,6 +42,21 @@ static DEFINE_SPINLOCK(opal_notifier_lock); + static uint64_t last_notified_mask = 0x0ul; + static atomic_t opal_notifier_hold = ATOMIC_INIT(0); + ++static void opal_reinit_cores(void) ++{ ++ /* Do the actual re-init, This will clobber all FPRs, VRs, etc... ++ * ++ * It will preserve non volatile GPRs and HSPRG0/1. It will ++ * also restore HIDs and other SPRs to their original value ++ * but it might clobber a bunch. ++ */ ++#ifdef __BIG_ENDIAN__ ++ opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); ++#else ++ opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); ++#endif ++} ++ + int __init early_init_dt_scan_opal(unsigned long node, + const char *uname, int depth, void *data) + { +@@ -77,6 +92,13 @@ int __init early_init_dt_scan_opal(unsigned long node, + printk("OPAL V1 detected !\n"); + } + ++ /* Reinit all cores with the right endian */ ++ opal_reinit_cores(); ++ ++ /* Restore some bits */ ++ if (cur_cpu_spec->cpu_restore) ++ cur_cpu_spec->cpu_restore(); ++ + return 1; + } + diff --git a/debian/patches/series b/debian/patches/series index ab1b88e..69c931a 100644 --- a/debian/patches/series +++ b/debian/patches/series @@ -59,6 +59,7 @@ bugfix/mips/disable-advansys.patch bugfix/arm/ixp4xx_iobe.patch bugfix/m68k/ethernat-kconfig.patch bugfix/arm/bfa-Replace-large-udelay-with-mdelay.patch +bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch # Miscellaneous bug fixes bugfix/all/misc-bmp085-Enable-building-as-a-module.patch -- 1.7.1 -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". 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