On Tue, 2005-03-22 at 12:21 -0800, David S. Miller wrote:
> On Tue, 22 Mar 2005 19:36:46 +0000 (GMT)
> Hugh Dickins <[email protected]> wrote:
>
> > I notice that although both i386 and sparc64 use pgtable-nopud.h, the
> > i386 pud_clear does nothing at all and the sparc64 pud_clear resets to 0.
>
> Aha! And ppc does as well via asm-generic/4level-fixup.h which is
> probably why I did it this way as well when I converted sparc64
> over to asm-generic/pgtable-nopud.h
>
> Hmmm, let me play around with this.
I converted ppc64 to no-pud.h but it seems to introduce some breakage...
X kills the box when launched on the G5, haven't had time to investigate
yet, it might be some bug of mine. Here is my current patch:
Index: linux-work/include/asm-ppc64/pgalloc.h
===================================================================
--- linux-work.orig/include/asm-ppc64/pgalloc.h 2005-03-07 14:00:11.000000000 +1100
+++ linux-work/include/asm-ppc64/pgalloc.h 2005-03-17 17:00:50.000000000 +1100
@@ -30,7 +30,7 @@
kmem_cache_free(zero_cache, pgd);
}
-#define pgd_populate(MM, PGD, PMD) pgd_set(PGD, PMD)
+#define pud_populate(MM, PUD, PMD) pud_set(PUD, PMD)
static inline pmd_t *
pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
Index: linux-work/include/asm-ppc64/pgtable.h
===================================================================
--- linux-work.orig/include/asm-ppc64/pgtable.h 2005-03-07 14:00:11.000000000 +1100
+++ linux-work/include/asm-ppc64/pgtable.h 2005-03-17 17:00:50.000000000 +1100
@@ -1,8 +1,6 @@
#ifndef _PPC64_PGTABLE_H
#define _PPC64_PGTABLE_H
-#include <asm-generic/4level-fixup.h>
-
/*
* This file contains the functions and defines necessary to modify and use
* the ppc64 hashed page table.
@@ -17,6 +15,8 @@
#include <asm/tlbflush.h>
#endif /* __ASSEMBLY__ */
+#include <asm-generic/pgtable-nopud.h>
+
/* PMD_SHIFT determines what a second-level page table entry can map */
#define PMD_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
#define PMD_SIZE (1UL << PMD_SHIFT)
@@ -216,12 +216,12 @@
#define pmd_page_kernel(pmd) \
(__bpn_to_ba(pmd_val(pmd) >> PMD_TO_PTEPAGE_SHIFT))
#define pmd_page(pmd) virt_to_page(pmd_page_kernel(pmd))
-#define pgd_set(pgdp, pmdp) (pgd_val(*(pgdp)) = (__ba_to_bpn(pmdp)))
-#define pgd_none(pgd) (!pgd_val(pgd))
-#define pgd_bad(pgd) ((pgd_val(pgd)) == 0)
-#define pgd_present(pgd) (pgd_val(pgd) != 0UL)
-#define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL)
-#define pgd_page(pgd) (__bpn_to_ba(pgd_val(pgd)))
+#define pud_set(pgdp, pmdp) (pud_val(*(pgdp)) = (__ba_to_bpn(pmdp)))
+#define pud_none(pgd) (!pud_val(pgd))
+#define pud_bad(pgd) ((pud_val(pgd)) == 0)
+#define pud_present(pgd) (pud_val(pgd) != 0UL)
+#define pud_clear(pgdp) (pud_val(*(pgdp)) = 0UL)
+#define pud_page(pgd) (__bpn_to_ba(pud_val(pgd)))
/*
* Find an entry in a page-table-directory. We combine the address region
@@ -233,8 +233,8 @@
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
/* Find an entry in the second-level page table.. */
-#define pmd_offset(dir,addr) \
- ((pmd_t *) pgd_page(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
+#define pmd_offset(pudp,addr) \
+ ((pmd_t *) pud_page(*(pudp)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
/* Find an entry in the third-level page table.. */
#define pte_offset_kernel(dir,addr) \
@@ -552,20 +552,23 @@
static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
{
pgd_t *pg;
+ pud_t *pu;
pmd_t *pm;
pte_t *pt = NULL;
pte_t pte;
pg = pgdir + pgd_index(ea);
if (!pgd_none(*pg)) {
-
- pm = pmd_offset(pg, ea);
- if (pmd_present(*pm)) {
- pt = pte_offset_kernel(pm, ea);
- pte = *pt;
- if (!pte_present(pte))
- pt = NULL;
- }
+ pu = pud_offset(pg, ea);
+ if (!pud_none(*pu)) {
+ pm = pmd_offset(pu, ea);
+ if (pmd_present(*pm)) {
+ pt = pte_offset_kernel(pm, ea);
+ pte = *pt;
+ if (!pte_present(pte))
+ pt = NULL;
+ }
+ }
}
return pt;
Index: linux-work/arch/ppc64/mm/init.c
===================================================================
--- linux-work.orig/arch/ppc64/mm/init.c 2005-03-15 11:57:29.000000000 +1100
+++ linux-work/arch/ppc64/mm/init.c 2005-03-17 17:20:14.000000000 +1100
@@ -136,14 +136,78 @@
#else
+static void unmap_im_area_pte(pmd_t *pmd, unsigned long addr,
+ unsigned long end)
+{
+ pte_t *pte;
+
+ pte = pte_offset_kernel(pmd, addr);
+ do {
+ pte_t ptent = ptep_get_and_clear(&ioremap_mm, addr, pte);
+ WARN_ON(!pte_none(ptent) && !pte_present(ptent));
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+}
+
+static inline void unmap_im_area_pmd(pud_t *pud, unsigned long addr,
+ unsigned long end)
+{
+ pmd_t *pmd;
+ unsigned long next;
+
+ pmd = pmd_offset(pud, addr);
+ do {
+ next = pmd_addr_end(addr, end);
+ if (pmd_none_or_clear_bad(pmd))
+ continue;
+ unmap_im_area_pte(pmd, addr, next);
+ } while (pmd++, addr = next, addr != end);
+}
+
+static inline void unmap_im_area_pud(pgd_t *pgd, unsigned long addr,
+ unsigned long end)
+{
+ pud_t *pud;
+ unsigned long next;
+
+ pud = pud_offset(pgd, addr);
+ do {
+ next = pud_addr_end(addr, end);
+ if (pud_none_or_clear_bad(pud))
+ continue;
+ unmap_im_area_pmd(pud, addr, next);
+ } while (pud++, addr = next, addr != end);
+}
+
+static void unmap_im_area(unsigned long addr, unsigned long end)
+{
+ struct mm_struct *mm = &ioremap_mm;
+ unsigned long next;
+ pgd_t *pgd;
+
+ spin_lock(&mm->page_table_lock);
+
+ pgd = pgd_offset_i(addr);
+ flush_cache_vunmap(addr, end);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (pgd_none_or_clear_bad(pgd))
+ continue;
+ unmap_im_area_pud(pgd, addr, end - addr);
+ } while (pgd++, addr = next, addr != end);
+ flush_tlb_kernel_range(start, end);
+
+ spin_unlock(&mm->page_table_lock);
+}
+
/*
* map_io_page currently only called by __ioremap
* map_io_page adds an entry to the ioremap page table
* and adds an entry to the HPT, possibly bolting it
*/
-static void map_io_page(unsigned long ea, unsigned long pa, int flags)
+static int map_io_page(unsigned long ea, unsigned long pa, int flags)
{
pgd_t *pgdp;
+ pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
unsigned long vsid;
@@ -151,9 +215,15 @@
if (mem_init_done) {
spin_lock(&ioremap_mm.page_table_lock);
pgdp = pgd_offset_i(ea);
- pmdp = pmd_alloc(&ioremap_mm, pgdp, ea);
+ pudp = pud_alloc(&ioremap_mm, pgdp, ea);
+ if (!pudp)
+ return -ENOMEM;
+ pmdp = pmd_alloc(&ioremap_mm, pudp, ea);
+ if (!pmdp)
+ return -ENOMEM;
ptep = pte_alloc_kernel(&ioremap_mm, pmdp, ea);
-
+ if (!ptep)
+ return -ENOMEM;
pa = abs_to_phys(pa);
set_pte_at(&ioremap_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags)));
spin_unlock(&ioremap_mm.page_table_lock);
@@ -180,6 +250,7 @@
panic("map_io_page: could not insert mapping");
}
}
+ return 0;
}
@@ -195,10 +266,15 @@
flags |= _PAGE_GUARDED;
for (i = 0; i < size; i += PAGE_SIZE) {
- map_io_page(ea+i, pa+i, flags);
+ if (map_io_page(ea+i, pa+i, flags))
+ goto failure;
}
return (void __iomem *) (ea + (addr & ~PAGE_MASK));
+ failure:
+ if (mem_init_done)
+ unmap_im_area(ea, ea + size);
+ return NULL;
}
@@ -208,10 +284,11 @@
return __ioremap(addr, size, _PAGE_NO_CACHE);
}
-void __iomem *
-__ioremap(unsigned long addr, unsigned long size, unsigned long flags)
+void __iomem * __ioremap(unsigned long addr, unsigned long size,
+ unsigned long flags)
{
unsigned long pa, ea;
+ void __iomem *ret;
/*
* Choose an address to map it to.
@@ -234,12 +311,16 @@
if (area == NULL)
return NULL;
ea = (unsigned long)(area->addr);
+ ret = __ioremap_com(addr, pa, ea, size, flags);
+ if (!ret)
+ im_free(area->addr);
} else {
ea = ioremap_bot;
- ioremap_bot += size;
+ ret = __ioremap_com(addr, pa, ea, size, flags);
+ if (ret)
+ ioremap_bot += size;
}
-
- return __ioremap_com(addr, pa, ea, size, flags);
+ return ret;
}
#define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
@@ -248,6 +329,7 @@
unsigned long size, unsigned long flags)
{
struct vm_struct *area;
+ void __iomem *ret;
/* For now, require page-aligned values for pa, ea, and size */
if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
@@ -277,7 +359,12 @@
}
}
- if (__ioremap_com(pa, pa, ea, size, flags) != (void *) ea) {
+ ret = __ioremap_com(pa, pa, ea, size, flags);
+ if (ret == NULL) {
+ printk(KERN_ERR "ioremap_explicit() allocation failure !\n");
+ return 1;
+ }
+ if (ret != (void *) ea) {
printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
return 1;
}
@@ -285,68 +372,6 @@
return 0;
}
-static void unmap_im_area_pte(pmd_t *pmd, unsigned long address,
- unsigned long size)
-{
- unsigned long base, end;
- pte_t *pte;
-
- if (pmd_none(*pmd))
- return;
- if (pmd_bad(*pmd)) {
- pmd_ERROR(*pmd);
- pmd_clear(pmd);
- return;
- }
-
- pte = pte_offset_kernel(pmd, address);
- base = address & PMD_MASK;
- address &= ~PMD_MASK;
- end = address + size;
- if (end > PMD_SIZE)
- end = PMD_SIZE;
-
- do {
- pte_t page;
- page = ptep_get_and_clear(&ioremap_mm, base + address, pte);
- address += PAGE_SIZE;
- pte++;
- if (pte_none(page))
- continue;
- if (pte_present(page))
- continue;
- printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
- } while (address < end);
-}
-
-static void unmap_im_area_pmd(pgd_t *dir, unsigned long address,
- unsigned long size)
-{
- unsigned long base, end;
- pmd_t *pmd;
-
- if (pgd_none(*dir))
- return;
- if (pgd_bad(*dir)) {
- pgd_ERROR(*dir);
- pgd_clear(dir);
- return;
- }
-
- pmd = pmd_offset(dir, address);
- base = address & PGDIR_MASK;
- address &= ~PGDIR_MASK;
- end = address + size;
- if (end > PGDIR_SIZE)
- end = PGDIR_SIZE;
-
- do {
- unmap_im_area_pte(pmd, base + address, end - address);
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address < end);
-}
-
/*
* Unmap an IO region and remove it from imalloc'd list.
* Access to IO memory should be serialized by driver.
@@ -356,39 +381,19 @@
*/
void iounmap(volatile void __iomem *token)
{
- unsigned long address, start, end, size;
- struct mm_struct *mm;
- pgd_t *dir;
+ unsigned long address, size;
void *addr;
- if (!mem_init_done) {
+ if (!mem_init_done)
return;
- }
addr = (void *) ((unsigned long __force) token & PAGE_MASK);
- if ((size = im_free(addr)) == 0) {
+ if ((size = im_free(addr)) == 0)
return;
- }
address = (unsigned long)addr;
- start = address;
- end = address + size;
-
- mm = &ioremap_mm;
- spin_lock(&mm->page_table_lock);
-
- dir = pgd_offset_i(address);
- flush_cache_vunmap(address, end);
- do {
- unmap_im_area_pmd(dir, address, end - address);
- address = (address + PGDIR_SIZE) & PGDIR_MASK;
- dir++;
- } while (address && (address < end));
- flush_tlb_kernel_range(start, end);
-
- spin_unlock(&mm->page_table_lock);
- return;
+ unmap_im_area(address, address + size);
}
static int iounmap_subset_regions(unsigned long addr, unsigned long size)
Index: linux-work/arch/ppc64/mm/hugetlbpage.c
===================================================================
--- linux-work.orig/arch/ppc64/mm/hugetlbpage.c 2005-03-07 14:00:11.000000000 +1100
+++ linux-work/arch/ppc64/mm/hugetlbpage.c 2005-03-17 17:00:50.000000000 +1100
@@ -42,7 +42,7 @@
return (addr & ~REGION_MASK) >> HUGEPGDIR_SHIFT;
}
-static pgd_t *hugepgd_offset(struct mm_struct *mm, unsigned long addr)
+static pud_t *hugepgd_offset(struct mm_struct *mm, unsigned long addr)
{
int index;
@@ -52,21 +52,21 @@
index = hugepgd_index(addr);
BUG_ON(index >= PTRS_PER_HUGEPGD);
- return mm->context.huge_pgdir + index;
+ return (pud_t *)(mm->context.huge_pgdir + index);
}
-static inline pte_t *hugepte_offset(pgd_t *dir, unsigned long addr)
+static inline pte_t *hugepte_offset(pud_t *dir, unsigned long addr)
{
int index;
- if (pgd_none(*dir))
+ if (pud_none(*dir))
return NULL;
index = (addr >> HPAGE_SHIFT) % PTRS_PER_HUGEPTE;
- return (pte_t *)pgd_page(*dir) + index;
+ return (pte_t *)pud_page(*dir) + index;
}
-static pgd_t *hugepgd_alloc(struct mm_struct *mm, unsigned long addr)
+static pud_t *hugepgd_alloc(struct mm_struct *mm, unsigned long addr)
{
BUG_ON(! in_hugepage_area(mm->context, addr));
@@ -90,10 +90,9 @@
return hugepgd_offset(mm, addr);
}
-static pte_t *hugepte_alloc(struct mm_struct *mm, pgd_t *dir,
- unsigned long addr)
+static pte_t *hugepte_alloc(struct mm_struct *mm, pud_t *dir, unsigned long addr)
{
- if (! pgd_present(*dir)) {
+ if (! pud_present(*dir)) {
pte_t *new;
spin_unlock(&mm->page_table_lock);
@@ -104,7 +103,7 @@
* Because we dropped the lock, we should re-check the
* entry, as somebody else could have populated it..
*/
- if (pgd_present(*dir)) {
+ if (pud_present(*dir)) {
if (new)
kmem_cache_free(zero_cache, new);
} else {
@@ -115,7 +114,7 @@
ptepage = virt_to_page(new);
ptepage->mapping = (void *) mm;
ptepage->index = addr & HUGEPGDIR_MASK;
- pgd_populate(mm, dir, new);
+ pud_populate(mm, dir, new);
}
}
@@ -124,28 +123,28 @@
static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
- pgd_t *pgd;
+ pud_t *pud;
BUG_ON(! in_hugepage_area(mm->context, addr));
- pgd = hugepgd_offset(mm, addr);
- if (! pgd)
+ pud = hugepgd_offset(mm, addr);
+ if (! pud)
return NULL;
- return hugepte_offset(pgd, addr);
+ return hugepte_offset(pud, addr);
}
static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
{
- pgd_t *pgd;
+ pud_t *pud;
BUG_ON(! in_hugepage_area(mm->context, addr));
- pgd = hugepgd_alloc(mm, addr);
- if (! pgd)
+ pud = hugepgd_alloc(mm, addr);
+ if (! pud)
return NULL;
- return hugepte_alloc(mm, pgd, addr);
+ return hugepte_alloc(mm, pud, addr);
}
static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma,
@@ -218,6 +217,7 @@
tlb = tlb_gather_mmu(mm, 0);
for (addr = start; addr < end; addr += PMD_SIZE) {
pgd_t *pgd = pgd_offset(mm, addr);
+ pud_t *pud;
pmd_t *pmd;
struct page *page;
pte_t *pte;
@@ -225,7 +225,10 @@
if (pgd_none(*pgd))
continue;
- pmd = pmd_offset(pgd, addr);
+ pud = pud_offset(pgd, addr);
+ if (pud_none(*pud))
+ continue;
+ pmd = pmd_offset(pud, addr);
if (!pmd || pmd_none(*pmd))
continue;
if (pmd_bad(*pmd)) {
@@ -756,10 +759,10 @@
/* cleanup any hugepte pages leftover */
for (i = 0; i < PTRS_PER_HUGEPGD; i++) {
- pgd_t *pgd = pgdir + i;
+ pud_t *pud = (pud_t *)(pgdir + i);
- if (! pgd_none(*pgd)) {
- pte_t *pte = (pte_t *)pgd_page(*pgd);
+ if (! pud_none(*pud)) {
+ pte_t *pte = (pte_t *)pud_page(*pud);
struct page *ptepage = virt_to_page(pte);
ptepage->mapping = NULL;
@@ -767,7 +770,7 @@
BUG_ON(memcmp(pte, empty_zero_page, PAGE_SIZE));
kmem_cache_free(zero_cache, pte);
}
- pgd_clear(pgd);
+ pud_clear(pud);
}
BUG_ON(memcmp(pgdir, empty_zero_page, PAGE_SIZE));
-
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