linux-kernel - [PATCH 5.8 140/148] powerpc: Fix P10 PVR revision in /proc/cpuinfo for SMT4 cores

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Message-Id: <20200824082420.725353079@linuxfoundation.org>
Date:   Mon, 24 Aug 2020 10:30:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Neuling <mikey@...ling.org>,
        Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.8 140/148] powerpc: Fix P10 PVR revision in /proc/cpuinfo for SMT4 cores

From: Michael Neuling <mikey@...ling.org>

commit 030a2c689fb46e1690f7ded8b194bab7678efb28 upstream.

On POWER10 bit 12 in the PVR indicates if the core is SMT4 or SMT8.
Bit 12 is set for SMT4.

Without this patch, /proc/cpuinfo on a SMT4 DD1 POWER10 looks like
this:
  cpu             : POWER10, altivec supported
  revision        : 17.0 (pvr 0080 1100)

Fixes: a3ea40d5c736 ("powerpc: Add POWER10 architected mode")
Cc: stable@...r.kernel.org # v5.8
Signed-off-by: Michael Neuling <mikey@...ling.org>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@...ux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20200803035600.1820371-1-mikey@neuling.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kernel/setup-common.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -311,6 +311,7 @@ static int show_cpuinfo(struct seq_file
 				min = pvr & 0xFF;
 				break;
 			case 0x004e: /* POWER9 bits 12-15 give chip type */
+			case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
 				maj = (pvr >> 8) & 0x0F;
 				min = pvr & 0xFF;
 				break;