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| author | Dave C Boutcher <boutcher@cs.umn.edu> | 2006-06-12 19:49:20 -0500 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-06-15 19:31:27 +1000 |
| commit | 368a6ba5d188552aea2a668301a259164c9f355e (patch) | |
| tree | d22916e2870618b2b4ff26588df8f66a5928ac64 | |
| parent | 0e4aa9c2009187fff1c999fe0aaa134c1a84f48a (diff) | |
| download | kernel_samsung_aries-368a6ba5d188552aea2a668301a259164c9f355e.zip kernel_samsung_aries-368a6ba5d188552aea2a668301a259164c9f355e.tar.gz kernel_samsung_aries-368a6ba5d188552aea2a668301a259164c9f355e.tar.bz2 | |
[POWERPC] check firmware state before suspending
Currently the kernel blindly halts all the processors and calls the
ibm,suspend-me rtas call. If the firmware is not in the correct
state, we then re-start all the processors and return. It is much
smarter to first check the firmware state, and only if it is waiting,
call the ibm,suspend-me call.
Signed-off-by: Paul Mackerras <paulus@samba.org>
| -rw-r--r-- | arch/powerpc/kernel/rtas.c | 22 | ||||
| -rw-r--r-- | include/asm-powerpc/hvcall.h | 10 | ||||
| -rw-r--r-- | include/asm-powerpc/rtas.h | 1 |
3 files changed, 33 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 13496f3..fd15e3e 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -593,9 +593,31 @@ out: static int rtas_ibm_suspend_me(struct rtas_args *args) { int i; + long state; + long rc; + unsigned long dummy; struct rtas_suspend_me_data data; + /* Make sure the state is valid */ + rc = plpar_hcall(H_VASI_STATE, + ((u64)args->args[0] << 32) | args->args[1], + 0, 0, 0, + &state, &dummy, &dummy); + + if (rc) { + printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned %ld\n",rc); + return rc; + } else if (state == H_VASI_ENABLED) { + args->args[args->nargs] = RTAS_NOT_SUSPENDABLE; + return 0; + } else if (state != H_VASI_SUSPENDING) { + printk(KERN_ERR "rtas_ibm_suspend_me: vasi_state returned state %ld\n", + state); + args->args[args->nargs] = -1; + return 0; + } + data.waiting = 1; data.args = args; diff --git a/include/asm-powerpc/hvcall.h b/include/asm-powerpc/hvcall.h index 6cc7e1f..0d3c4e8 100644 --- a/include/asm-powerpc/hvcall.h +++ b/include/asm-powerpc/hvcall.h @@ -102,6 +102,15 @@ #define H_PP1 (1UL<<(63-62)) #define H_PP2 (1UL<<(63-63)) +/* VASI States */ +#define H_VASI_INVALID 0 +#define H_VASI_ENABLED 1 +#define H_VASI_ABORTED 2 +#define H_VASI_SUSPENDING 3 +#define H_VASI_SUSPENDED 4 +#define H_VASI_RESUMED 5 +#define H_VASI_COMPLETED 6 + /* DABRX flags */ #define H_DABRX_HYPERVISOR (1UL<<(63-61)) #define H_DABRX_KERNEL (1UL<<(63-62)) @@ -190,6 +199,7 @@ #define H_QUERY_INT_STATE 0x1E4 #define H_POLL_PENDING 0x1D8 #define H_JOIN 0x298 +#define H_VASI_STATE 0x2A4 #define H_ENABLE_CRQ 0x2B0 #ifndef __ASSEMBLY__ diff --git a/include/asm-powerpc/rtas.h b/include/asm-powerpc/rtas.h index a3b4e55..02e213e 100644 --- a/include/asm-powerpc/rtas.h +++ b/include/asm-powerpc/rtas.h @@ -24,6 +24,7 @@ #define RTAS_RMOBUF_MAX (64 * 1024) /* RTAS return status codes */ +#define RTAS_NOT_SUSPENDABLE -9004 #define RTAS_BUSY -2 /* RTAS Busy */ #define RTAS_EXTENDED_DELAY_MIN 9900 #define RTAS_EXTENDED_DELAY_MAX 9905 |