linux-kernel - [tip: x86/platform] x86/platform/uv: Decode UVsystab Info

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Date:   Mon, 07 Oct 2019 14:49:31 -0000
From:   "tip-bot2 for Mike Travis" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Mike Travis <mike.travis@....com>, Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Hedi Berriche <hedi.berriche@....com>,
        Justin Ernst <justin.ernst@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Russ Anderson <russ.anderson@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: [tip: x86/platform] x86/platform/uv: Decode UVsystab Info

The following commit has been merged into the x86/platform branch of tip:

Commit-ID:     f5a8f0ecb436a15f50215f27ab70a2e8626a6135
Gitweb:        https://git.kernel.org/tip/f5a8f0ecb436a15f50215f27ab70a2e8626a6135
Author:        Mike Travis <mike.travis@....com>
AuthorDate:    Tue, 10 Sep 2019 09:58:45 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Mon, 07 Oct 2019 13:42:11 +02:00

x86/platform/uv: Decode UVsystab Info

Decode the hubless UVsystab passed from BIOS to the kernel saving
pertinent info in a similar manner that hubbed UVsystabs are decoded.

Signed-off-by: Mike Travis <mike.travis@....com>
Reviewed-by: Steve Wahl <steve.wahl@....com>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Hedi Berriche <hedi.berriche@....com>
Cc: Justin Ernst <justin.ernst@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Russ Anderson <russ.anderson@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20190910145840.135325066@stormcage.eag.rdlabs.hpecorp.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/apic/x2apic_uv_x.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index b505905..ec940ad 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1303,7 +1303,8 @@ static int __init decode_uv_systab(void)
 	struct uv_systab *st;
 	int i;
 
-	if (uv_hub_info->hub_revision < UV4_HUB_REVISION_BASE)
+	/* If system is uv3 or lower, there is no extended UVsystab */
+	if (is_uv_hubbed(0xfffffe) < uv(4) && is_uv_hubless(0xfffffe) < uv(4))
 		return 0;	/* No extended UVsystab required */
 
 	st = uv_systab;
@@ -1554,8 +1555,15 @@ static __init int uv_system_init_hubless(void)
 
 	/* Init kernel/BIOS interface */
 	rc = uv_bios_init();
+	if (rc < 0)
+		return rc;
 
-	/* Create user access node if UVsystab available */
+	/* Process UVsystab */
+	rc = decode_uv_systab();
+	if (rc < 0)
+		return rc;
+
+	/* Create user access node */
 	if (rc >= 0)
 		uv_setup_proc_files(1);