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-rw-r--r--arch/powerpc/kernel/paca.c70
1 files changed, 68 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index a4e72159234f..ebf9846f3c3b 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();
}