1 files changed, 71 insertions, 22 deletions

diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index d16b1ea55d44..0c40c6f476fe 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -9,11 +9,15 @@
 
 #include <linux/threads.h>
 #include <linux/module.h>
+#include <linux/lmb.h>
 
+#include <asm/firmware.h>
 #include <asm/lppaca.h>
 #include <asm/paca.h>
 #include <asm/sections.h>
 #include <asm/pgtable.h>
+#include <asm/iseries/lpar_map.h>
+#include <asm/iseries/hv_types.h>
 
 /* This symbol is provided by the linker - let it fill in the paca
  * field correctly */
@@ -70,37 +74,82 @@ struct slb_shadow slb_shadow[] __cacheline_aligned = {
  * processors.  The processor VPD array needs one entry per physical
  * processor (not thread).
  */
-struct paca_struct paca[NR_CPUS];
+struct paca_struct *paca;
 EXPORT_SYMBOL(paca);
 
-void __init initialise_pacas(void)
-{
-        int cpu;
+struct paca_struct boot_paca;
 
-        /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
-         * of the TOC can be addressed using a single machine instruction.
-         */
+void __init initialise_paca(struct paca_struct *new_paca, int cpu)
+{
+       /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
+        * of the TOC can be addressed using a single machine instruction.
+        */
         unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
 
-        /* Can't use for_each_*_cpu, as they aren't functional yet */
-        for (cpu = 0; cpu < NR_CPUS; cpu++) {
-                struct paca_struct *new_paca = &paca[cpu];
-
 #ifdef CONFIG_PPC_BOOK3S
-                new_paca->lppaca_ptr = &lppaca[cpu];
+        new_paca->lppaca_ptr = &lppaca[cpu];
 #else
-                new_paca->kernel_pgd = swapper_pg_dir;
+        new_paca->kernel_pgd = swapper_pg_dir;
 #endif
-                new_paca->lock_token = 0x8000;
-                new_paca->paca_index = cpu;
-                new_paca->kernel_toc = kernel_toc;
-                new_paca->kernelbase = (unsigned long) _stext;
-                new_paca->kernel_msr = MSR_KERNEL;
-                new_paca->hw_cpu_id = 0xffff;
-                new_paca->__current = &init_task;
+        new_paca->lock_token = 0x8000;
+        new_paca->paca_index = cpu;
+        new_paca->kernel_toc = kernel_toc;
+        new_paca->kernelbase = (unsigned long) _stext;
+        new_paca->kernel_msr = MSR_KERNEL;
+        new_paca->hw_cpu_id = 0xffff;
+        new_paca->__current = &init_task;
 #ifdef CONFIG_PPC_STD_MMU_64
-                new_paca->slb_shadow_ptr = &slb_shadow[cpu];
+        new_paca->slb_shadow_ptr = &slb_shadow[cpu];
 #endif /* CONFIG_PPC_STD_MMU_64 */
+}
+
+static int __initdata paca_size;
+
+void __init allocate_pacas(void)
+{
+        int nr_cpus, cpu, limit;
+
+        /*
+         * We can't take SLB misses on the paca, and we want to access them
+         * in real mode, so allocate them within the RMA and also within
+         * the first segment. On iSeries they must be within the area mapped
+         * by the HV, which is HvPagesToMap * HVPAGESIZE bytes.
+         */
+        limit = min(0x10000000ULL, lmb.rmo_size);
+        if (firmware_has_feature(FW_FEATURE_ISERIES))
+                limit = min(limit, HvPagesToMap * HVPAGESIZE);
+
+        nr_cpus = NR_CPUS;
+        /* On iSeries we know we can never have more than 64 cpus */
+        if (firmware_has_feature(FW_FEATURE_ISERIES))
+                nr_cpus = min(64, nr_cpus);
+
+        paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpus);
+
+        paca = __va(lmb_alloc_base(paca_size, PAGE_SIZE, limit));
+        memset(paca, 0, paca_size);
+
+        printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
+                paca_size, nr_cpus, paca);
+
+        /* Can't use for_each_*_cpu, as they aren't functional yet */
+        for (cpu = 0; cpu < nr_cpus; cpu++)
+                initialise_paca(&paca[cpu], cpu);
+}
+
+void __init free_unused_pacas(void)
+{
+        int new_size;
+
+        new_size = PAGE_ALIGN(sizeof(struct paca_struct) * num_possible_cpus());
+
+        if (new_size >= paca_size)
+                return;
+
+        lmb_free(__pa(paca) + new_size, paca_size - new_size);
+
+        printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
+                paca_size - new_size);
 
-        }
+        paca_size = new_size;
 }