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| author | Brian King <brking@linux.vnet.ibm.com> | 2009-08-28 14:06:29 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-09-02 08:19:01 +0200 |
| commit | 46db2f86a3b2a94e0b33e0b4548fb7b7b6bdff66 (patch) | |
| tree | 6aef8ab146a54d04dd207b0f85f362a4aee3ef5d /arch/powerpc/kernel | |
| parent | powerpc/powermac: Thermal control turns system off too eagerly (diff) | |
| download | linux-46db2f86a3b2a94e0b33e0b4548fb7b7b6bdff66.tar.xz linux-46db2f86a3b2a94e0b33e0b4548fb7b7b6bdff66.zip | |
powerpc/pseries: Fix to handle slb resize across migration
The SLB can change sizes across a live migration, which was not
being handled, resulting in possible machine crashes during
migration if migrating to a machine which has a smaller max SLB
size than the source machine. Fix this by first reducing the
SLB size to the minimum possible value, which is 32, prior to
migration. Then during the device tree update which occurs after
migration, we make the call to ensure the SLB gets updated. Also
add the slb_size to the lparcfg output so that the migration
tools can check to make sure the kernel has this capability
before allowing migration in scenarios where the SLB size will change.
BenH: Fixed #include <asm/mmu-hash64.h> -> <asm/mmu.h> to avoid
breaking ppc32 build
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/lparcfg.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/rtas.c | 7 |
2 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c index 2419cc706ff1..ed0ac4e4b8d8 100644 --- a/arch/powerpc/kernel/lparcfg.c +++ b/arch/powerpc/kernel/lparcfg.c @@ -35,6 +35,7 @@ #include <asm/prom.h> #include <asm/vdso_datapage.h> #include <asm/vio.h> +#include <asm/mmu.h> #define MODULE_VERS "1.8" #define MODULE_NAME "lparcfg" @@ -537,6 +538,8 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v) seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc); + seq_printf(m, "slb_size=%d\n", mmu_slb_size); + return 0; } diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index c434823b8c83..bf90361bb70f 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -39,6 +39,7 @@ #include <asm/smp.h> #include <asm/atomic.h> #include <asm/time.h> +#include <asm/mmu.h> struct rtas_t rtas = { .lock = __RAW_SPIN_LOCK_UNLOCKED @@ -713,6 +714,7 @@ static void rtas_percpu_suspend_me(void *info) { long rc = H_SUCCESS; unsigned long msr_save; + u16 slb_size = mmu_slb_size; int cpu; struct rtas_suspend_me_data *data = (struct rtas_suspend_me_data *)info; @@ -735,13 +737,16 @@ static void rtas_percpu_suspend_me(void *info) /* All other cpus are in H_JOIN, this cpu does * the suspend. */ + slb_set_size(SLB_MIN_SIZE); printk(KERN_DEBUG "calling ibm,suspend-me on cpu %i\n", smp_processor_id()); data->error = rtas_call(data->token, 0, 1, NULL); - if (data->error) + if (data->error) { printk(KERN_DEBUG "ibm,suspend-me returned %d\n", data->error); + slb_set_size(slb_size); + } } else { printk(KERN_ERR "H_JOIN on cpu %i failed with rc = %ld\n", smp_processor_id(), rc); |