The patch titled
Subject: sparc64: Document PGD and PMD layout.
has been added to the -mm tree. Its filename is
sparc64-document-pgd-and-pmd-layout.patch
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------------------------------------------------------
From: David Miller <davem@xxxxxxxxxxxxx>
Subject: sparc64: Document PGD and PMD layout.
We're going to be messing around with the PMD interpretation and layout
for the sake of transparent huge pages, so we better clearly document what
we're starting with.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sparc/include/asm/pgtable_64.h | 16 ++++++++++++----
arch/sparc/include/asm/tsb.h | 8 ++++----
2 files changed, 16 insertions(+), 8 deletions(-)
diff -puN arch/sparc/include/asm/pgtable_64.h~sparc64-document-pgd-and-pmd-layout arch/sparc/include/asm/pgtable_64.h
--- a/arch/sparc/include/asm/pgtable_64.h~sparc64-document-pgd-and-pmd-layout
+++ a/arch/sparc/include/asm/pgtable_64.h
@@ -63,6 +63,14 @@
#error Page table parameters do not cover virtual address space properly.
#endif
+/* PMDs point to PTE tables which are 4K aligned. */
+#define PMD_PADDR _AC(0xfffffffe,UL)
+#define PMD_PADDR_SHIFT _AC(11,UL)
+
+/* PGDs point to PMD tables which are 8K aligned. */
+#define PGD_PADDR _AC(0xfffffffc,UL)
+#define PGD_PADDR_SHIFT _AC(11,UL)
+
#ifndef __ASSEMBLY__
#include <linux/sched.h>
@@ -581,14 +589,14 @@ static inline unsigned long pte_special(
}
#define pmd_set(pmdp, ptep) \
- (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL))
+ (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> PMD_PADDR_SHIFT))
#define pud_set(pudp, pmdp) \
- (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> 11UL))
+ (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> PGD_PADDR_SHIFT))
#define __pmd_page(pmd) \
- ((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL)))
+ ((unsigned long) __va((((unsigned long)pmd_val(pmd))<<PMD_PADDR_SHIFT)))
#define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))
#define pud_page_vaddr(pud) \
- ((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL)))
+ ((unsigned long) __va((((unsigned long)pud_val(pud))<<PGD_PADDR_SHIFT)))
#define pud_page(pud) virt_to_page((void *)pud_page_vaddr(pud))
#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_bad(pmd) (0)
diff -puN arch/sparc/include/asm/tsb.h~sparc64-document-pgd-and-pmd-layout arch/sparc/include/asm/tsb.h
--- a/arch/sparc/include/asm/tsb.h~sparc64-document-pgd-and-pmd-layout
+++ a/arch/sparc/include/asm/tsb.h
@@ -147,13 +147,13 @@ extern struct tsb_phys_patch_entry __tsb
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
- sllx REG1, 11, REG1; \
+ sllx REG1, PGD_PADDR_SHIFT, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - (PAGE_SHIFT - 1), REG2; \
- sllx REG1, 11, REG1; \
+ sllx REG1, PMD_PADDR_SHIFT, REG1; \
andn REG2, 0x7, REG2; \
add REG1, REG2, REG1;
@@ -172,13 +172,13 @@ extern struct tsb_phys_patch_entry __tsb
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
- sllx REG1, 11, REG1; \
+ sllx REG1, PGD_PADDR_SHIFT, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - (PAGE_SHIFT - 1), REG2; \
- sllx REG1, 11, REG1; \
+ sllx REG1, PMD_PADDR_SHIFT, REG1; \
andn REG2, 0x7, REG2; \
add REG1, REG2, REG1;
_
Patches currently in -mm which might be from davem@xxxxxxxxxxxxx are
origin.patch
linux-next.patch
kconfig-clean-up-the-long-arch-list-for-the-uid16-config-option.patch
kconfig-clean-up-the-long-arch-list-for-the-debug_kmemleak-config-option.patch
kconfig-clean-up-the-long-arch-list-for-the-debug_bugverbose-config-option.patch
kconfig-clean-up-the-if-definedarch-list-for-exception-trace-sysctl-entry.patch
atomic-implement-generic-atomic_dec_if_positive.patch
atomic-implement-generic-atomic_dec_if_positive-fix.patch
sparc64-only-support-4mb-huge-pages-and-8kb-base-pages.patch
sparc64-halve-the-size-of-pte-tables.patch
sparc64-eliminate-pte-table-memory-wastage.patch
sparc64-document-pgd-and-pmd-layout.patch
mm-add-and-use-update_mmu_cache_pmd-in-transparent-huge-page-code.patch
mm-add-and-use-update_mmu_cache_pmd-in-transparent-huge-page-code-fix.patch
mm-thp-use-more-portable-pmd-clearing-sequenece-in-zap_huge_pmd.patch
sparc64-support-transparent-huge-pages.patch
compat-generic-compat_sys_sched_rr_get_interval-implementation.patch
--
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