diff options
| author | Michael Neuling <mikey@neuling.org> | 2017-06-15 04:53:16 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-06-27 05:09:07 +0300 |
| commit | 64ebb9a208c6e66316329a6d9101815d1ee06fa9 (patch) | |
| tree | 02d12076c6facf991b5922ab046180fa5c7f23b1 /arch | |
| parent | 0428491cba9277db42d66eb245d74255bd3dbfe7 (diff) | |
| download | linux-64ebb9a208c6e66316329a6d9101815d1ee06fa9.tar.xz | |
powerpc: Fix /proc/cpuinfo revision for POWER9 DD2
The P9 PVR bits 12-15 don't indicate a revision but instead different
chip configurations. From BookIV we have:
Bits Configuration
0 : Scale out 12 cores
1 : Scale out 24 cores
2 : Scale up 12 cores
3 : Scale up 24 cores
DD1 doesn't use this but DD2 does. Linux will mostly use the "Scale
out 24 core" configuration (ie. SMT4 not SMT8) which results in a PVR
of 0x004e1200. The reported revision in /proc/cpuinfo is hence
reported incorrectly as "18.0".
This patch fixes this to mask off only the relevant bits for the major
revision (ie. bits 8-11) for POWER9.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/setup-common.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c index 71dcda91755d..096dee58b9c1 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -335,6 +335,10 @@ static int show_cpuinfo(struct seq_file *m, void *v) maj = ((pvr >> 8) & 0xFF) - 1; min = pvr & 0xFF; break; + case 0x004e: /* POWER9 bits 12-15 give chip type */ + maj = (pvr >> 8) & 0x0F; + min = pvr & 0xFF; + break; default: maj = (pvr >> 8) & 0xFF; min = pvr & 0xFF; |