* Alex Chiang <achiang@xxxxxx>: > > And if anyone has other suggestions too, I'm happy to hear them. Actually, this might be a relatively clean approach. As far as I can tell, the only purpose for sal_revision / sal_version is to display some boot messages. No one (other than my use below) is keying off them for anything. My fixup is based on the mail that Russ sent out with his bootlog. It contained this line: SAL 2.9: SGI SN2 version 1.30 So that's what I'm keying off of below. Thanks. /ac From: Alex Chiang <achiang@xxxxxx> Subject: [PATCH] ia64: workaround tiger ia64_sal_get_physical_id_info hang Intel Tiger platforms hang when calling SAL_GET_PHYSICAL_ID_INFO instead of properly returning -1 for unimplemented, so add a version check. SGI Altix platforms have an incorrect SAL version hard-coded into their prom -- they encode 2.9, but actually implement 3.2 -- so fix it up and allow ia64_sal_get_physical_id_info to keep working. Signed-off-by: Alex Chiang <achiang@xxxxxx> --- diff --git a/arch/ia64/kernel/sal.c b/arch/ia64/kernel/sal.c index f44fe84..4f3686a 100644 --- a/arch/ia64/kernel/sal.c +++ b/arch/ia64/kernel/sal.c @@ -109,6 +109,15 @@ check_versions (struct ia64_sal_systab *systab) sal_revision = SAL_VERSION_CODE(2, 8); sal_version = SAL_VERSION_CODE(0, 0); } + + if (ia64_platform_is("sn2") + && (sal_revision == SAL_VERSION_CODE(2, 9)) + && (sal_version == SAL_VERSION_CODE(1, 90))) + /* + * SGI Altix has hard-coded version 2.9 in their prom + * but they actually implement 3.2, so let's fix it here. + */ + sal_revision = SAL_VERSION_CODE(3, 2); } static void __init diff --git a/include/asm-ia64/sal.h b/include/asm-ia64/sal.h index 2251118..f4904db 100644 --- a/include/asm-ia64/sal.h +++ b/include/asm-ia64/sal.h @@ -807,6 +807,10 @@ static inline s64 ia64_sal_physical_id_info(u16 *splid) { struct ia64_sal_retval isrv; + + if (sal_revision < SAL_VERSION_CODE(3,2)) + return -1; + SAL_CALL(isrv, SAL_PHYSICAL_ID_INFO, 0, 0, 0, 0, 0, 0, 0); if (splid) *splid = isrv.v0; - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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