diff options
| author | Ian Munsie <imunsie@au1.ibm.com> | 2012-11-14 18:49:44 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-10 15:09:05 +1100 |
| commit | 42d02b81f265b77be39262666c888d50cb488fc5 (patch) | |
| tree | 057869a84883845ac91f536a683a0b9e9829e45c /arch/powerpc/kernel | |
| parent | 41c7b401b9c131a53823673a788d73e340ce4d2a (diff) | |
| download | linux-42d02b81f265b77be39262666c888d50cb488fc5.tar.bz2 | |
powerpc: Define differences between doorbells on book3e and book3s
There are a few key differences between doorbells on server compared
with embedded that we care about on Linux, namely:
- We have a new msgsndp instruction for directed privileged doorbells.
msgsnd is used for directed hypervisor doorbells.
- The tag we use in the instruction is the Thread Identification
Register of the recipient thread (since server doorbells can only
occur between threads within a single core), and is only 7 bits wide.
- A new message type is introduced for server doorbells (none of the
existing book3e message types are currently supported on book3s).
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Tested-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/dbell.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c index a892680668d8..9ebbc24bb23c 100644 --- a/arch/powerpc/kernel/dbell.c +++ b/arch/powerpc/kernel/dbell.c @@ -21,7 +21,7 @@ #ifdef CONFIG_SMP void doorbell_setup_this_cpu(void) { - unsigned long tag = mfspr(SPRN_PIR) & 0x3fff; + unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK; smp_muxed_ipi_set_data(smp_processor_id(), tag); } @@ -30,7 +30,7 @@ void doorbell_cause_ipi(int cpu, unsigned long data) { /* Order previous accesses vs. msgsnd, which is treated as a store */ mb(); - ppc_msgsnd(PPC_DBELL, 0, data); + ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data); } void doorbell_exception(struct pt_regs *regs) |