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authorLinus Torvalds <torvalds@linux-foundation.org>2011-07-25 21:00:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-25 21:00:19 -0700
commit45b583b10a8b438b970e95a7d1d4db22c9e35004 (patch)
tree14fa481598289df0459580c582b48a9d95db51f6 /arch/sparc
parent154dd78d30b56ffb8b447f629bfcceb14150e5c4 (diff)
parentf19da2ce8ef5e49b8b8ea199c3601dd45d71b262 (diff)
downloadop-kernel-dev-45b583b10a8b438b970e95a7d1d4db22c9e35004.zip
op-kernel-dev-45b583b10a8b438b970e95a7d1d4db22c9e35004.tar.gz
Merge 'akpm' patch series
* Merge akpm patch series: (122 commits) drivers/connector/cn_proc.c: remove unused local Documentation/SubmitChecklist: add RCU debug config options reiserfs: use hweight_long() reiserfs: use proper little-endian bitops pnpacpi: register disabled resources drivers/rtc/rtc-tegra.c: properly initialize spinlock drivers/rtc/rtc-twl.c: check return value of twl_rtc_write_u8() in twl_rtc_set_time() drivers/rtc: add support for Qualcomm PMIC8xxx RTC drivers/rtc/rtc-s3c.c: support clock gating drivers/rtc/rtc-mpc5121.c: add support for RTC on MPC5200 init: skip calibration delay if previously done misc/eeprom: add eeprom access driver for digsy_mtc board misc/eeprom: add driver for microwire 93xx46 EEPROMs checkpatch.pl: update $logFunctions checkpatch: make utf-8 test --strict checkpatch.pl: add ability to ignore various messages checkpatch: add a "prefer __aligned" check checkpatch: validate signature styles and To: and Cc: lines checkpatch: add __rcu as a sparse modifier checkpatch: suggest using min_t or max_t ... Did this as a merge because of (trivial) conflicts in - Documentation/feature-removal-schedule.txt - arch/xtensa/include/asm/uaccess.h that were just easier to fix up in the merge than in the patch series.
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/Kconfig5
-rw-r--r--arch/sparc/include/asm/pgalloc_64.h76
-rw-r--r--arch/sparc/include/asm/pgtable_64.h15
-rw-r--r--arch/sparc/mm/Makefile2
-rw-r--r--arch/sparc/mm/gup.c181
-rw-r--r--arch/sparc/mm/tsb.c11
6 files changed, 264 insertions, 26 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 253986b..1074ddd 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -41,6 +41,7 @@ config SPARC64
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
select HAVE_KRETPROBES
select HAVE_KPROBES
+ select HAVE_RCU_TABLE_FREE if SMP
select HAVE_MEMBLOCK
select HAVE_SYSCALL_WRAPPERS
select HAVE_DYNAMIC_FTRACE
@@ -81,10 +82,6 @@ config IOMMU_HELPER
bool
default y if SPARC64
-config QUICKLIST
- bool
- default y if SPARC64
-
config STACKTRACE_SUPPORT
bool
default y if SPARC64
diff --git a/arch/sparc/include/asm/pgalloc_64.h b/arch/sparc/include/asm/pgalloc_64.h
index 4e5e087..40b2d7a 100644
--- a/arch/sparc/include/asm/pgalloc_64.h
+++ b/arch/sparc/include/asm/pgalloc_64.h
@@ -5,7 +5,6 @@
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/slab.h>
-#include <linux/quicklist.h>
#include <asm/spitfire.h>
#include <asm/cpudata.h>
@@ -14,71 +13,114 @@
/* Page table allocation/freeing. */
+extern struct kmem_cache *pgtable_cache;
+
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
- return quicklist_alloc(0, GFP_KERNEL, NULL);
+ return kmem_cache_alloc(pgtable_cache, GFP_KERNEL);
}
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
- quicklist_free(0, NULL, pgd);
+ kmem_cache_free(pgtable_cache, pgd);
}
#define pud_populate(MM, PUD, PMD) pud_set(PUD, PMD)
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- return quicklist_alloc(0, GFP_KERNEL, NULL);
+ return kmem_cache_alloc(pgtable_cache,
+ GFP_KERNEL|__GFP_REPEAT);
}
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
- quicklist_free(0, NULL, pmd);
+ kmem_cache_free(pgtable_cache, pmd);
}
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
{
- return quicklist_alloc(0, GFP_KERNEL, NULL);
+ return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
}
static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
unsigned long address)
{
struct page *page;
- void *pg;
+ pte_t *pte;
- pg = quicklist_alloc(0, GFP_KERNEL, NULL);
- if (!pg)
+ pte = pte_alloc_one_kernel(mm, address);
+ if (!pte)
return NULL;
- page = virt_to_page(pg);
+ page = virt_to_page(pte);
pgtable_page_ctor(page);
return page;
}
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
- quicklist_free(0, NULL, pte);
+ free_page((unsigned long)pte);
}
static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
pgtable_page_dtor(ptepage);
- quicklist_free_page(0, NULL, ptepage);
+ __free_page(ptepage);
}
-
#define pmd_populate_kernel(MM, PMD, PTE) pmd_set(PMD, PTE)
#define pmd_populate(MM,PMD,PTE_PAGE) \
pmd_populate_kernel(MM,PMD,page_address(PTE_PAGE))
#define pmd_pgtable(pmd) pmd_page(pmd)
-static inline void check_pgt_cache(void)
+#define check_pgt_cache() do { } while (0)
+
+static inline void pgtable_free(void *table, bool is_page)
+{
+ if (is_page)
+ free_page((unsigned long)table);
+ else
+ kmem_cache_free(pgtable_cache, table);
+}
+
+#ifdef CONFIG_SMP
+
+struct mmu_gather;
+extern void tlb_remove_table(struct mmu_gather *, void *);
+
+static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page)
+{
+ unsigned long pgf = (unsigned long)table;
+ if (is_page)
+ pgf |= 0x1UL;
+ tlb_remove_table(tlb, (void *)pgf);
+}
+
+static inline void __tlb_remove_table(void *_table)
+{
+ void *table = (void *)((unsigned long)_table & ~0x1UL);
+ bool is_page = false;
+
+ if ((unsigned long)_table & 0x1UL)
+ is_page = true;
+ pgtable_free(table, is_page);
+}
+#else /* CONFIG_SMP */
+static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page)
{
- quicklist_trim(0, NULL, 25, 16);
+ pgtable_free(table, is_page);
+}
+#endif /* !CONFIG_SMP */
+
+static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *ptepage,
+ unsigned long address)
+{
+ pgtable_page_dtor(ptepage);
+ pgtable_free_tlb(tlb, page_address(ptepage), true);
}
-#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
-#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
+#define __pmd_free_tlb(tlb, pmd, addr) \
+ pgtable_free_tlb(tlb, pmd, false)
#endif /* _SPARC64_PGALLOC_H */
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 1e03c5a..adf8932 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -95,6 +95,10 @@
/* PTE bits which are the same in SUN4U and SUN4V format. */
#define _PAGE_VALID _AC(0x8000000000000000,UL) /* Valid TTE */
#define _PAGE_R _AC(0x8000000000000000,UL) /* Keep ref bit uptodate*/
+#define _PAGE_SPECIAL _AC(0x0200000000000000,UL) /* Special page */
+
+/* Advertise support for _PAGE_SPECIAL */
+#define __HAVE_ARCH_PTE_SPECIAL
/* SUN4U pte bits... */
#define _PAGE_SZ4MB_4U _AC(0x6000000000000000,UL) /* 4MB Page */
@@ -104,6 +108,7 @@
#define _PAGE_NFO_4U _AC(0x1000000000000000,UL) /* No Fault Only */
#define _PAGE_IE_4U _AC(0x0800000000000000,UL) /* Invert Endianness */
#define _PAGE_SOFT2_4U _AC(0x07FC000000000000,UL) /* Software bits, set 2 */
+#define _PAGE_SPECIAL_4U _AC(0x0200000000000000,UL) /* Special page */
#define _PAGE_RES1_4U _AC(0x0002000000000000,UL) /* Reserved */
#define _PAGE_SZ32MB_4U _AC(0x0001000000000000,UL) /* (Panther) 32MB page */
#define _PAGE_SZ256MB_4U _AC(0x2001000000000000,UL) /* (Panther) 256MB page */
@@ -133,6 +138,7 @@
#define _PAGE_ACCESSED_4V _AC(0x1000000000000000,UL) /* Accessed (ref'd) */
#define _PAGE_READ_4V _AC(0x0800000000000000,UL) /* Readable SW Bit */
#define _PAGE_WRITE_4V _AC(0x0400000000000000,UL) /* Writable SW Bit */
+#define _PAGE_SPECIAL_4V _AC(0x0200000000000000,UL) /* Special page */
#define _PAGE_PADDR_4V _AC(0x00FFFFFFFFFFE000,UL) /* paddr[55:13] */
#define _PAGE_IE_4V _AC(0x0000000000001000,UL) /* Invert Endianness */
#define _PAGE_E_4V _AC(0x0000000000000800,UL) /* side-Effect */
@@ -302,10 +308,10 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t prot)
: "=r" (mask), "=r" (tmp)
: "i" (_PAGE_PADDR_4U | _PAGE_MODIFIED_4U | _PAGE_ACCESSED_4U |
_PAGE_CP_4U | _PAGE_CV_4U | _PAGE_E_4U | _PAGE_PRESENT_4U |
- _PAGE_SZBITS_4U),
+ _PAGE_SZBITS_4U | _PAGE_SPECIAL),
"i" (_PAGE_PADDR_4V | _PAGE_MODIFIED_4V | _PAGE_ACCESSED_4V |
_PAGE_CP_4V | _PAGE_CV_4V | _PAGE_E_4V | _PAGE_PRESENT_4V |
- _PAGE_SZBITS_4V));
+ _PAGE_SZBITS_4V | _PAGE_SPECIAL));
return __pte((pte_val(pte) & mask) | (pgprot_val(prot) & ~mask));
}
@@ -502,6 +508,7 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkspecial(pte_t pte)
{
+ pte_val(pte) |= _PAGE_SPECIAL;
return pte;
}
@@ -607,9 +614,9 @@ static inline unsigned long pte_present(pte_t pte)
return val;
}
-static inline int pte_special(pte_t pte)
+static inline unsigned long pte_special(pte_t pte)
{
- return 0;
+ return pte_val(pte) & _PAGE_SPECIAL;
}
#define pmd_set(pmdp, ptep) \
diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile
index 79836a7..e3cda21 100644
--- a/arch/sparc/mm/Makefile
+++ b/arch/sparc/mm/Makefile
@@ -4,7 +4,7 @@
asflags-y := -ansi
ccflags-y := -Werror
-obj-$(CONFIG_SPARC64) += ultra.o tlb.o tsb.o
+obj-$(CONFIG_SPARC64) += ultra.o tlb.o tsb.o gup.o
obj-y += fault_$(BITS).o
obj-y += init_$(BITS).o
obj-$(CONFIG_SPARC32) += loadmmu.o
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c
new file mode 100644
index 0000000..a986b5d
--- /dev/null
+++ b/arch/sparc/mm/gup.c
@@ -0,0 +1,181 @@
+/*
+ * Lockless get_user_pages_fast for sparc, cribbed from powerpc
+ *
+ * Copyright (C) 2008 Nick Piggin
+ * Copyright (C) 2008 Novell Inc.
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/vmstat.h>
+#include <linux/pagemap.h>
+#include <linux/rwsem.h>
+#include <asm/pgtable.h>
+
+/*
+ * The performance critical leaf functions are made noinline otherwise gcc
+ * inlines everything into a single function which results in too much
+ * register pressure.
+ */
+static noinline int gup_pte_range(pmd_t pmd, unsigned long addr,
+ unsigned long end, int write, struct page **pages, int *nr)
+{
+ unsigned long mask, result;
+ pte_t *ptep;
+
+ if (tlb_type == hypervisor) {
+ result = _PAGE_PRESENT_4V|_PAGE_P_4V;
+ if (write)
+ result |= _PAGE_WRITE_4V;
+ } else {
+ result = _PAGE_PRESENT_4U|_PAGE_P_4U;
+ if (write)
+ result |= _PAGE_WRITE_4U;
+ }
+ mask = result | _PAGE_SPECIAL;
+
+ ptep = pte_offset_kernel(&pmd, addr);
+ do {
+ struct page *page, *head;
+ pte_t pte = *ptep;
+
+ if ((pte_val(pte) & mask) != result)
+ return 0;
+ VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
+
+ /* The hugepage case is simplified on sparc64 because
+ * we encode the sub-page pfn offsets into the
+ * hugepage PTEs. We could optimize this in the future
+ * use page_cache_add_speculative() for the hugepage case.
+ */
+ page = pte_page(pte);
+ head = compound_head(page);
+ if (!page_cache_get_speculative(head))
+ return 0;
+ if (unlikely(pte_val(pte) != pte_val(*ptep))) {
+ put_page(head);
+ return 0;
+ }
+
+ pages[*nr] = page;
+ (*nr)++;
+ } while (ptep++, addr += PAGE_SIZE, addr != end);
+
+ return 1;
+}
+
+static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
+ int write, struct page **pages, int *nr)
+{
+ unsigned long next;
+ pmd_t *pmdp;
+
+ pmdp = pmd_offset(&pud, addr);
+ do {
+ pmd_t pmd = *pmdp;
+
+ next = pmd_addr_end(addr, end);
+ if (pmd_none(pmd))
+ return 0;
+ if (!gup_pte_range(pmd, addr, next, write, pages, nr))
+ return 0;
+ } while (pmdp++, addr = next, addr != end);
+
+ return 1;
+}
+
+static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end,
+ int write, struct page **pages, int *nr)
+{
+ unsigned long next;
+ pud_t *pudp;
+
+ pudp = pud_offset(&pgd, addr);
+ do {
+ pud_t pud = *pudp;
+
+ next = pud_addr_end(addr, end);
+ if (pud_none(pud))
+ return 0;
+ if (!gup_pmd_range(pud, addr, next, write, pages, nr))
+ return 0;
+ } while (pudp++, addr = next, addr != end);
+
+ return 1;
+}
+
+int get_user_pages_fast(unsigned long start, int nr_pages, int write,
+ struct page **pages)
+{
+ struct mm_struct *mm = current->mm;
+ unsigned long addr, len, end;
+ unsigned long next;
+ pgd_t *pgdp;
+ int nr = 0;
+
+ start &= PAGE_MASK;
+ addr = start;
+ len = (unsigned long) nr_pages << PAGE_SHIFT;
+ end = start + len;
+
+ /*
+ * XXX: batch / limit 'nr', to avoid large irq off latency
+ * needs some instrumenting to determine the common sizes used by
+ * important workloads (eg. DB2), and whether limiting the batch size
+ * will decrease performance.
+ *
+ * It seems like we're in the clear for the moment. Direct-IO is
+ * the main guy that batches up lots of get_user_pages, and even
+ * they are limited to 64-at-a-time which is not so many.
+ */
+ /*
+ * This doesn't prevent pagetable teardown, but does prevent
+ * the pagetables from being freed on sparc.
+ *
+ * So long as we atomically load page table pointers versus teardown,
+ * we can follow the address down to the the page and take a ref on it.
+ */
+ local_irq_disable();
+
+ pgdp = pgd_offset(mm, addr);
+ do {
+ pgd_t pgd = *pgdp;
+
+ next = pgd_addr_end(addr, end);
+ if (pgd_none(pgd))
+ goto slow;
+ if (!gup_pud_range(pgd, addr, next, write, pages, &nr))
+ goto slow;
+ } while (pgdp++, addr = next, addr != end);
+
+ local_irq_enable();
+
+ VM_BUG_ON(nr != (end - start) >> PAGE_SHIFT);
+ return nr;
+
+ {
+ int ret;
+
+slow:
+ local_irq_enable();
+
+ /* Try to get the remaining pages with get_user_pages */
+ start += nr << PAGE_SHIFT;
+ pages += nr;
+
+ down_read(&mm->mmap_sem);
+ ret = get_user_pages(current, mm, start,
+ (end - start) >> PAGE_SHIFT, write, 0, pages, NULL);
+ up_read(&mm->mmap_sem);
+
+ /* Have to be a bit careful with return values */
+ if (nr > 0) {
+ if (ret < 0)
+ ret = nr;
+ else
+ ret += nr;
+ }
+
+ return ret;
+ }
+}
diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c
index a5f51b2..536412d 100644
--- a/arch/sparc/mm/tsb.c
+++ b/arch/sparc/mm/tsb.c
@@ -236,6 +236,8 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_idx, unsign
}
}
+struct kmem_cache *pgtable_cache __read_mostly;
+
static struct kmem_cache *tsb_caches[8] __read_mostly;
static const char *tsb_cache_names[8] = {
@@ -253,6 +255,15 @@ void __init pgtable_cache_init(void)
{
unsigned long i;
+ pgtable_cache = kmem_cache_create("pgtable_cache",
+ PAGE_SIZE, PAGE_SIZE,
+ 0,
+ _clear_page);
+ if (!pgtable_cache) {
+ prom_printf("pgtable_cache_init(): Could not create!\n");
+ prom_halt();
+ }
+
for (i = 0; i < 8; i++) {
unsigned long size = 8192 << i;
const char *name = tsb_cache_names[i];
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