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| author |   Ravi Bangoria <ravi.bangoria@linux.ibm.com> | 2020-07-23 14:38:09 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-07-26 23:34:19 +1000 |
| commit | 8f45ca3f8b87c4810674fbfe65de6d041ee0baee (patch) | |
| tree | e11fd5f522bc2f641ffa1f2fdc56e0cc8793821f /arch/powerpc/kernel/prom.c | |
| parent | powerpc/dt_cpu_ftrs: Add feature for 2nd DAWR (diff) | |
| download | linux-dev-8f45ca3f8b87c4810674fbfe65de6d041ee0baee.tar.xz linux-dev-8f45ca3f8b87c4810674fbfe65de6d041ee0baee.zip | |
powerpc/watchpoint: Set CPU_FTR_DAWR1 based on pa-features bit
As per the PAPR, bit 0 of byte 64 in pa-features property indicates
availability of 2nd DAWR registers. i.e. If this bit is set, 2nd
DAWR is present, otherwise not. Host generally uses "cpu-features",
which masks "pa-features". But "cpu-features" are still not used for
guests and thus this change is mostly applicable for guests only.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Tested-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200723090813.303838-7-ravi.bangoria@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index dfe0103ad131..5a05c5e993fd 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -175,6 +175,8 @@ static struct ibm_pa_feature { */ { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP, .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP }, + + { .pabyte = 64, .pabit = 0, .cpu_features = CPU_FTR_DAWR1 }, }; static void __init scan_features(unsigned long node, const unsigned char *ftrs, |