The following commit has been merged into the x86/platform branch of tip: Commit-ID: 6a7cf55e9f2b743695adac84375548aa18112327 Gitweb: https://git.kernel.org/tip/6a7cf55e9f2b743695adac84375548aa18112327 Author: Mike Travis <mike.tra...@hpe.com> AuthorDate: Mon, 05 Oct 2020 15:39:27 -05:00 Committer: Borislav Petkov <b...@suse.de> CommitterDate: Wed, 07 Oct 2020 09:09:04 +02:00
x86/platform/uv: Update UV5 TSC checking Update check of BIOS TSC sync status to include both possible "invalid" states provided by newer UV5 BIOS. Signed-off-by: Mike Travis <mike.tra...@hpe.com> Signed-off-by: Borislav Petkov <b...@suse.de> Reviewed-by: Steve Wahl <steve.w...@hpe.com> Link: https://lkml.kernel.org/r/20201005203929.148656-12-mike.tra...@hpe.com --- arch/x86/include/asm/uv/uv_hub.h | 2 +- arch/x86/kernel/apic/x2apic_uv_x.c | 24 ++++++++++-------------- 2 files changed, 11 insertions(+), 15 deletions(-) diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h index ecf5c93..07079b5 100644 --- a/arch/x86/include/asm/uv/uv_hub.h +++ b/arch/x86/include/asm/uv/uv_hub.h @@ -726,7 +726,7 @@ extern void uv_nmi_setup_hubless(void); #define UVH_TSC_SYNC_SHIFT_UV2K 16 /* UV2/3k have different bits */ #define UVH_TSC_SYNC_MASK 3 /* 0011 */ #define UVH_TSC_SYNC_VALID 3 /* 0011 */ -#define UVH_TSC_SYNC_INVALID 2 /* 0010 */ +#define UVH_TSC_SYNC_UNKNOWN 0 /* 0000 */ /* BMC sets a bit this MMR non-zero before sending an NMI */ #define UVH_NMI_MMR UVH_BIOS_KERNEL_MMR diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c index 9b44f45..9a83aa1 100644 --- a/arch/x86/kernel/apic/x2apic_uv_x.c +++ b/arch/x86/kernel/apic/x2apic_uv_x.c @@ -197,36 +197,32 @@ static void __init uv_tsc_check_sync(void) int sync_state; int mmr_shift; char *state; - bool valid; - /* Accommodate different UV arch BIOSes */ + /* Different returns from different UV BIOS versions */ mmr = uv_early_read_mmr(UVH_TSC_SYNC_MMR); mmr_shift = is_uv2_hub() ? UVH_TSC_SYNC_SHIFT_UV2K : UVH_TSC_SYNC_SHIFT; sync_state = (mmr >> mmr_shift) & UVH_TSC_SYNC_MASK; + /* Check if TSC is valid for all sockets */ switch (sync_state) { case UVH_TSC_SYNC_VALID: state = "in sync"; - valid = true; + mark_tsc_async_resets("UV BIOS"); break; - case UVH_TSC_SYNC_INVALID: - state = "unstable"; - valid = false; + /* If BIOS state unknown, don't do anything */ + case UVH_TSC_SYNC_UNKNOWN: + state = "unknown"; break; + + /* Otherwise, BIOS indicates problem with TSC */ default: - state = "unknown: assuming valid"; - valid = true; + state = "unstable"; + mark_tsc_unstable("UV BIOS"); break; } pr_info("UV: TSC sync state from BIOS:0%d(%s)\n", sync_state, state); - - /* Mark flag that says TSC != 0 is valid for socket 0 */ - if (valid) - mark_tsc_async_resets("UV BIOS"); - else - mark_tsc_unstable("UV BIOS"); } /* Selector for (4|4A|5) structs */
