[PATCH] ppc64: support 64k pages

Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel
base page size to 64K.  The resulting kernel still boots on any
hardware.  On current machines with 4K pages support only, the kernel
will maintain 16 "subpages" for each 64K page transparently.

Note that while real 64K capable HW has been tested, the current patch
will not enable it yet as such hardware is not released yet, and I'm
still verifying with the firmware architects the proper to get the
information from the newer hypervisors.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 40 insertions, 17 deletions

diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h
index c019501daceb..79a0556a0ab8 100644
--- a/include/asm-powerpc/cputable.h
+++ b/include/asm-powerpc/cputable.h
@@ -101,6 +101,7 @@ extern void do_cpu_ftr_fixups(unsigned long offset);
 #define CPU_FTR_COHERENT_ICACHE         ASM_CONST(0x0000020000000000)
 #define CPU_FTR_LOCKLESS_TLBIE          ASM_CONST(0x0000040000000000)
 #define CPU_FTR_MMCRA_SIHV              ASM_CONST(0x0000080000000000)
+#define CPU_FTR_CI_LARGE_PAGE           ASM_CONST(0x0000100000000000)
 #else
 /* ensure on 32b processors the flags are available for compiling but
  * don't do anything */
@@ -116,6 +117,7 @@ extern void do_cpu_ftr_fixups(unsigned long offset);
 #define CPU_FTR_COHERENT_ICACHE         ASM_CONST(0x0)
 #define CPU_FTR_LOCKLESS_TLBIE          ASM_CONST(0x0)
 #define CPU_FTR_MMCRA_SIHV              ASM_CONST(0x0)
+#define CPU_FTR_CI_LARGE_PAGE           ASM_CONST(0x0)
 #endif
 
 #ifndef __ASSEMBLY__
@@ -339,6 +341,7 @@ enum {
 #ifdef __powerpc64__
             CPU_FTRS_POWER3 | CPU_FTRS_RS64 | CPU_FTRS_POWER4 |
             CPU_FTRS_PPC970 | CPU_FTRS_POWER5 | CPU_FTRS_CELL |
+            CPU_FTR_CI_LARGE_PAGE |
 #endif
             0,
 
diff --git a/include/asm-powerpc/iommu.h b/include/asm-powerpc/iommu.h
index 9d91bdd667ae..6a35e6570ccd 100644
--- a/include/asm-powerpc/iommu.h
+++ b/include/asm-powerpc/iommu.h
@@ -74,6 +74,11 @@ extern void iommu_devnode_init_pSeries(struct device_node *dn);
 
 /* Creates table for an individual device node */
 extern void iommu_devnode_init_iSeries(struct device_node *dn);
+/* Get table parameters from HV */
+extern void iommu_table_getparms_iSeries(unsigned long busno,
+                                         unsigned char slotno,
+                                         unsigned char virtbus,
+                                         struct iommu_table* tbl);
 
 #endif /* CONFIG_PPC_ISERIES */
 
diff --git a/include/asm-powerpc/machdep.h b/include/asm-powerpc/machdep.h
index 629ca964b974..fa03864d06eb 100644
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -47,20 +47,22 @@ struct machdep_calls {
 #ifdef CONFIG_PPC64
         void            (*hpte_invalidate)(unsigned long slot,
                                            unsigned long va,
-                                           int large,
+                                           int psize,
                                            int local);
         long            (*hpte_updatepp)(unsigned long slot, 
                                          unsigned long newpp, 
                                          unsigned long va,
-                                         int large,
+                                         int pize,
                                          int local);
         void            (*hpte_updateboltedpp)(unsigned long newpp, 
-                                               unsigned long ea);
+                                               unsigned long ea,
+                                               int psize);
         long            (*hpte_insert)(unsigned long hpte_group,
                                        unsigned long va,
                                        unsigned long prpn,
+                                       unsigned long rflags,
                                        unsigned long vflags,
-                                       unsigned long rflags);
+                                       int psize);
         long            (*hpte_remove)(unsigned long hpte_group);
         void            (*flush_hash_range)(unsigned long number, int local);
 
diff --git a/include/asm-powerpc/prom.h b/include/asm-powerpc/prom.h
index 3a0104fa0462..7587bf5f38c6 100644
--- a/include/asm-powerpc/prom.h
+++ b/include/asm-powerpc/prom.h
@@ -178,6 +178,14 @@ extern struct device_node *of_get_next_child(const struct device_node *node,
 extern struct device_node *of_node_get(struct device_node *node);
 extern void of_node_put(struct device_node *node);
 
+/* For scanning the flat device-tree at boot time */
+int __init of_scan_flat_dt(int (*it)(unsigned long node,
+                                     const char *uname, int depth,
+                                     void *data),
+                           void *data);
+void* __init of_get_flat_dt_prop(unsigned long node, const char *name,
+                                 unsigned long *size);
+
 /* For updating the device tree at runtime */
 extern void of_attach_node(struct device_node *);
 extern void of_detach_node(const struct device_node *);
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index b5da0b851e02..3536a5cd7a2d 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -289,7 +289,7 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
 
 #ifdef CONFIG_PPC64
 static __inline__ unsigned long
-__cmpxchg_u64(volatile long *p, unsigned long old, unsigned long new)
+__cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new)
 {
         unsigned long prev;
 
diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h
index ab17db79f69d..e525f49bd179 100644
--- a/include/asm-powerpc/thread_info.h
+++ b/include/asm-powerpc/thread_info.h
@@ -65,23 +65,27 @@ struct thread_info {
 
 /* thread information allocation */
 
-#ifdef CONFIG_DEBUG_STACK_USAGE
-#define THREAD_INFO_GFP         GFP_KERNEL | __GFP_ZERO
-#else
-#define THREAD_INFO_GFP         GFP_KERNEL
-#endif
-
 #if THREAD_SHIFT >= PAGE_SHIFT
 
 #define THREAD_ORDER    (THREAD_SHIFT - PAGE_SHIFT)
 
+#ifdef CONFIG_DEBUG_STACK_USAGE
 #define alloc_thread_info(tsk)  \
-        ((struct thread_info *)__get_free_pages(THREAD_INFO_GFP, THREAD_ORDER))
+        ((struct thread_info *)__get_free_pages(GFP_KERNEL | \
+                __GFP_ZERO, THREAD_ORDER))
+#else
+#define alloc_thread_info(tsk)  \
+        ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER))
+#endif
 #define free_thread_info(ti)    free_pages((unsigned long)ti, THREAD_ORDER)
 
 #else /* THREAD_SHIFT < PAGE_SHIFT */
 
-#define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, THREAD_INFO_GFP)
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define alloc_thread_info(tsk)  kzalloc(THREAD_SIZE, GFP_KERNEL)
+#else
+#define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, GFP_KERNEL)
+#endif
 #define free_thread_info(ti)    kfree(ti)
 
 #endif /* THREAD_SHIFT < PAGE_SHIFT */
diff --git a/include/asm-powerpc/tlbflush.h b/include/asm-powerpc/tlbflush.h
index ca3655672bbc..a2998eee37bb 100644
--- a/include/asm-powerpc/tlbflush.h
+++ b/include/asm-powerpc/tlbflush.h
@@ -31,9 +31,9 @@ struct mm_struct;
 struct ppc64_tlb_batch {
         unsigned long index;
         struct mm_struct *mm;
-        pte_t pte[PPC64_TLB_BATCH_NR];
+        real_pte_t pte[PPC64_TLB_BATCH_NR];
         unsigned long vaddr[PPC64_TLB_BATCH_NR];
-        unsigned int large;
+        unsigned int psize;
 };
 DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
 
@@ -48,8 +48,9 @@ static inline void flush_tlb_pending(void)
         put_cpu_var(ppc64_tlb_batch);
 }
 
-extern void flush_hash_page(unsigned long va, pte_t pte, int local);
-void flush_hash_range(unsigned long number, int local);
+extern void flush_hash_page(unsigned long va, real_pte_t pte, int psize,
+                            int local);
+extern void flush_hash_range(unsigned long number, int local);
 
 #else /* CONFIG_PPC64 */