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| author | Al Cooper <alcooperx@gmail.com> | 2012-07-13 16:44:51 -0400 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2012-10-11 11:04:34 +0200 |
| commit | da4b62cd6762ce327f660c6e45c8d5a739197159 (patch) | |
| tree | 7cbb0b1ce047c514f92da5ef382ca0bc6002cf21 /arch/mips/kernel/cpu-probe.c | |
| parent | c5600b2dd9fc7318feddf69f127ca793437c714d (diff) | |
| download | linux-da4b62cd6762ce327f660c6e45c8d5a739197159.tar.gz linux-da4b62cd6762ce327f660c6e45c8d5a739197159.tar.bz2 linux-da4b62cd6762ce327f660c6e45c8d5a739197159.zip | |
MIPS: perf: Add cpu feature bit for PCI (performance counter interrupt)
The PCI (Program Counter Interrupt) bit in the "cause" register
is mandatory for MIPS32R2 cores, but has also been added to some R1
cores (BMIPS5000). This change adds a cpu feature bit to make it
easier to check for and use this feature.
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/4106/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index bc58bd10a607..bd2809698e39 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -1194,8 +1194,11 @@ __cpuinit void cpu_probe(void) } } - if (cpu_has_mips_r2) + if (cpu_has_mips_r2) { c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1; + /* R2 has Performance Counter Interrupt indicator */ + c->options |= MIPS_CPU_PCI; + } else c->srsets = 1; |