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| author | Suresh Warrier <warrier@linux.vnet.ibm.com> | 2015-12-17 14:59:03 -0600 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2016-02-29 16:25:06 +1100 |
| commit | bd7f561f76563f0b21701628874d8adc863b0c25 (patch) | |
| tree | 836b532ce16706052af703b1dbab04fa8f4d340f /arch/powerpc/kernel | |
| parent | d3695aa4f452bc09c834a5010484f65fca37d87c (diff) | |
| download | linux-bd7f561f76563f0b21701628874d8adc863b0c25.tar.gz | |
powerpc/smp: Support more IPI messages
This patch increases the number of demuxed messages for a controller with a single ipi to 8 for 64-bit systems. This is required because we want to use the IPI mechanism to send messages from a CPU running in KVM real mode in a guest to a CPU in the host to take some action. Currently, we only support 4 messages and all 4 are already taken. Define a fifth message PPC_MSG_RM_HOST_ACTION for this purpose. Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index ec9ec2058d2d..a53a13047330 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -206,7 +206,7 @@ int smp_request_message_ipi(int virq, int msg) #ifdef CONFIG_PPC_SMP_MUXED_IPI struct cpu_messages { - int messages; /* current messages */ + long messages; /* current messages */ unsigned long data; /* data for cause ipi */ }; static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message); @@ -236,15 +236,15 @@ void smp_muxed_ipi_message_pass(int cpu, int msg) } #ifdef __BIG_ENDIAN__ -#define IPI_MESSAGE(A) (1 << (24 - 8 * (A))) +#define IPI_MESSAGE(A) (1uL << ((BITS_PER_LONG - 8) - 8 * (A))) #else -#define IPI_MESSAGE(A) (1 << (8 * (A))) +#define IPI_MESSAGE(A) (1uL << (8 * (A))) #endif irqreturn_t smp_ipi_demux(void) { struct cpu_messages *info = this_cpu_ptr(&ipi_message); - unsigned int all; + unsigned long all; mb(); /* order any irq clear */ |