diff options
Diffstat (limited to 'arch/powerpc/kernel/paca.c')
-rw-r--r-- | arch/powerpc/kernel/paca.c | 70 |
1 files changed, 68 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index a4e7215..ebf9846 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -27,6 +27,20 @@ extern unsigned long __toc_start; #ifdef CONFIG_PPC_BOOK3S /* + * We only have to have statically allocated lppaca structs on + * legacy iSeries, which supports at most 64 cpus. + */ +#ifdef CONFIG_PPC_ISERIES +#if NR_CPUS < 64 +#define NR_LPPACAS NR_CPUS +#else +#define NR_LPPACAS 64 +#endif +#else /* not iSeries */ +#define NR_LPPACAS 1 +#endif + +/* * The structure which the hypervisor knows about - this structure * should not cross a page boundary. The vpa_init/register_vpa call * is now known to fail if the lppaca structure crosses a page @@ -36,7 +50,7 @@ extern unsigned long __toc_start; * will suffice to ensure that it doesn't cross a page boundary. */ struct lppaca lppaca[] = { - [0 ... (NR_CPUS-1)] = { + [0 ... (NR_LPPACAS-1)] = { .desc = 0xd397d781, /* "LpPa" */ .size = sizeof(struct lppaca), .dyn_proc_status = 2, @@ -49,6 +63,54 @@ struct lppaca lppaca[] = { }, }; +static struct lppaca *extra_lppacas; +static long __initdata lppaca_size; + +static void allocate_lppacas(int nr_cpus, unsigned long limit) +{ + if (nr_cpus <= NR_LPPACAS) + return; + + lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) * + (nr_cpus - NR_LPPACAS)); + extra_lppacas = __va(memblock_alloc_base(lppaca_size, + PAGE_SIZE, limit)); +} + +static struct lppaca *new_lppaca(int cpu) +{ + struct lppaca *lp; + + if (cpu < NR_LPPACAS) + return &lppaca[cpu]; + + lp = extra_lppacas + (cpu - NR_LPPACAS); + *lp = lppaca[0]; + + return lp; +} + +static void free_lppacas(void) +{ + long new_size = 0, nr; + + if (!lppaca_size) + return; + nr = num_possible_cpus() - NR_LPPACAS; + if (nr > 0) + new_size = PAGE_ALIGN(nr * sizeof(struct lppaca)); + if (new_size >= lppaca_size) + return; + + memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size); + lppaca_size = new_size; +} + +#else + +static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { } +static inline void free_lppacas(void) { } + #endif /* CONFIG_PPC_BOOK3S */ #ifdef CONFIG_PPC_STD_MMU_64 @@ -88,7 +150,7 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu) unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; #ifdef CONFIG_PPC_BOOK3S - new_paca->lppaca_ptr = &lppaca[cpu]; + new_paca->lppaca_ptr = new_lppaca(cpu); #else new_paca->kernel_pgd = swapper_pg_dir; #endif @@ -144,6 +206,8 @@ void __init allocate_pacas(void) printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", paca_size, nr_cpus, paca); + allocate_lppacas(nr_cpus, limit); + /* Can't use for_each_*_cpu, as they aren't functional yet */ for (cpu = 0; cpu < nr_cpus; cpu++) initialise_paca(&paca[cpu], cpu); @@ -164,4 +228,6 @@ void __init free_unused_pacas(void) paca_size - new_size); paca_size = new_size; + + free_lppacas(); } |