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WSL2-Linux-Kernel
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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Further fixes for the removal of 4level-fixup hack from ppc32
  [POWERPC] EEH: log all PCI-X and PCI-E AER registers
  [POWERPC] EEH: capture and log pci state on error
  [POWERPC] EEH: Split up long error msg
  [POWERPC] EEH: log error only after driver notification.
  [POWERPC] fsl_soc: Make mac_addr const in fs_enet_of_init().
  [POWERPC] Don't use SLAB/SLUB for PTE pages
  [POWERPC] Spufs support for 64K LS mappings on 4K kernels
  [POWERPC] Add ability to 4K kernel to hash in 64K pages
  [POWERPC] Introduce address space "slices"
  [POWERPC] Small fixes & cleanups in segment page size demotion
  [POWERPC] iSeries: Make HVC_ISERIES the default
  [POWERPC] iSeries: suppress build warning in lparmap.c
  [POWERPC] Mark pages that don't exist as nosave
  [POWERPC] swsusp: Introduce register_nosave_region_late
This commit is contained in:
Linus Torvalds 2007-05-09 12:56:01 -07:00
Родитель 9a9136e270 f1a1eb299a
Коммит aabded9c3a
38 изменённых файлов: 1321 добавлений и 787 удалений
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24
arch/powerpc/Kconfig
Просмотреть файл

@ -120,19 +120,6 @@ config GENERIC_BUG
config SYS_SUPPORTS_APM_EMULATION
bool
#
# Powerpc uses the slab allocator to manage its ptes and the
# page structs of ptes are used for splitting the page table
# lock for configurations supporting more than SPLIT_PTLOCK_CPUS.
#
# In that special configuration the page structs of slabs are modified.
# This setting disables the selection of SLUB as a slab allocator.
#
config ARCH_USES_SLAB_PAGE_STRUCT
bool
default y
depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
config DEFAULT_UIMAGE
bool
help
@ -352,6 +339,11 @@ config PPC_STD_MMU_32
def_bool y
depends on PPC_STD_MMU && PPC32
config PPC_MM_SLICES
bool
default y if HUGETLB_PAGE
default n
config VIRT_CPU_ACCOUNTING
bool "Deterministic task and CPU time accounting"
depends on PPC64
@ -541,9 +533,15 @@ config NODES_SPAN_OTHER_NODES
def_bool y
depends on NEED_MULTIPLE_NODES
config PPC_HAS_HASH_64K
bool
depends on PPC64
default n
config PPC_64K_PAGES
bool "64k page size"
depends on PPC64
select PPC_HAS_HASH_64K
help
This option changes the kernel logical page size to 64k. On machines
without processor support for 64k pages, the kernel will simulate

16
arch/powerpc/kernel/asm-offsets.c
Просмотреть файл

@ -122,12 +122,18 @@ int main(void)
DEFINE(PACASLBCACHE, offsetof(struct paca_struct, slb_cache));
DEFINE(PACASLBCACHEPTR, offsetof(struct paca_struct, slb_cache_ptr));
DEFINE(PACACONTEXTID, offsetof(struct paca_struct, context.id));
DEFINE(PACACONTEXTSLLP, offsetof(struct paca_struct, context.sllp));
DEFINE(PACAVMALLOCSLLP, offsetof(struct paca_struct, vmalloc_sllp));
#ifdef CONFIG_HUGETLB_PAGE
DEFINE(PACALOWHTLBAREAS, offsetof(struct paca_struct, context.low_htlb_areas));
DEFINE(PACAHIGHHTLBAREAS, offsetof(struct paca_struct, context.high_htlb_areas));
#endif /* CONFIG_HUGETLB_PAGE */
#ifdef CONFIG_PPC_MM_SLICES
DEFINE(PACALOWSLICESPSIZE, offsetof(struct paca_struct,
context.low_slices_psize));
DEFINE(PACAHIGHSLICEPSIZE, offsetof(struct paca_struct,
context.high_slices_psize));
DEFINE(MMUPSIZEDEFSIZE, sizeof(struct mmu_psize_def));
DEFINE(MMUPSIZESLLP, offsetof(struct mmu_psize_def, sllp));
#else
DEFINE(PACACONTEXTSLLP, offsetof(struct paca_struct, context.sllp));
#endif /* CONFIG_PPC_MM_SLICES */
DEFINE(PACA_EXGEN, offsetof(struct paca_struct, exgen));
DEFINE(PACA_EXMC, offsetof(struct paca_struct, exmc));
DEFINE(PACA_EXSLB, offsetof(struct paca_struct, exslb));

3
arch/powerpc/kernel/lparmap.c
Просмотреть файл

@ -10,7 +10,8 @@
#include <asm/pgtable.h>
#include <asm/iseries/lpar_map.h>
const struct LparMap __attribute__((__section__(".text"))) xLparMap = {
/* The # is to stop gcc trying to make .text nonexecutable */
const struct LparMap __attribute__((__section__(".text #"))) xLparMap = {
.xNumberEsids = HvEsidsToMap,
.xNumberRanges = HvRangesToMap,
.xSegmentTableOffs = STAB0_PAGE,

1
arch/powerpc/mm/Makefile
Просмотреть файл

@ -18,4 +18,5 @@ obj-$(CONFIG_40x) += 4xx_mmu.o
obj-$(CONFIG_44x) += 44x_mmu.o
obj-$(CONFIG_FSL_BOOKE) += fsl_booke_mmu.o
obj-$(CONFIG_NEED_MULTIPLE_NODES) += numa.o
obj-$(CONFIG_PPC_MM_SLICES) += slice.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o

5
arch/powerpc/mm/hash_low_64.S
Просмотреть файл

@ -615,6 +615,9 @@ htab_pte_insert_failure:
li r3,-1
b htab_bail
#endif /* CONFIG_PPC_64K_PAGES */
#ifdef CONFIG_PPC_HAS_HASH_64K
/*****************************************************************************
* *
@ -870,7 +873,7 @@ ht64_pte_insert_failure:
b ht64_bail
#endif /* CONFIG_PPC_64K_PAGES */
#endif /* CONFIG_PPC_HAS_HASH_64K */
/*****************************************************************************

142
arch/powerpc/mm/hash_utils_64.c
Просмотреть файл

@ -51,6 +51,7 @@
#include <asm/cputable.h>
#include <asm/abs_addr.h>
#include <asm/sections.h>
#include <asm/spu.h>
#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
@ -419,7 +420,7 @@ static void __init htab_finish_init(void)
extern unsigned int *htab_call_hpte_remove;
extern unsigned int *htab_call_hpte_updatepp;
#ifdef CONFIG_PPC_64K_PAGES
#ifdef CONFIG_PPC_HAS_HASH_64K
extern unsigned int *ht64_call_hpte_insert1;
extern unsigned int *ht64_call_hpte_insert2;
extern unsigned int *ht64_call_hpte_remove;
@ -596,22 +597,23 @@ unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap)
* Demote a segment to using 4k pages.
* For now this makes the whole process use 4k pages.
*/
void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
{
#ifdef CONFIG_PPC_64K_PAGES
static void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
{
if (mm->context.user_psize == MMU_PAGE_4K)
return;
#ifdef CONFIG_PPC_MM_SLICES
slice_set_user_psize(mm, MMU_PAGE_4K);
#else /* CONFIG_PPC_MM_SLICES */
mm->context.user_psize = MMU_PAGE_4K;
mm->context.sllp = SLB_VSID_USER | mmu_psize_defs[MMU_PAGE_4K].sllp;
get_paca()->context = mm->context;
slb_flush_and_rebolt();
#endif /* CONFIG_PPC_MM_SLICES */
#ifdef CONFIG_SPE_BASE
spu_flush_all_slbs(mm);
#endif
#endif
}
EXPORT_SYMBOL_GPL(demote_segment_4k);
#endif /* CONFIG_PPC_64K_PAGES */
/* Result code is:
* 0 - handled
@ -646,7 +648,11 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
return 1;
}
vsid = get_vsid(mm->context.id, ea);
#ifdef CONFIG_PPC_MM_SLICES
psize = get_slice_psize(mm, ea);
#else
psize = mm->context.user_psize;
#endif
break;
case VMALLOC_REGION_ID:
mm = &init_mm;
@ -674,11 +680,22 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
if (user_region && cpus_equal(mm->cpu_vm_mask, tmp))
local = 1;
#ifdef CONFIG_HUGETLB_PAGE
/* Handle hugepage regions */
if (unlikely(in_hugepage_area(mm->context, ea))) {
if (HPAGE_SHIFT && psize == mmu_huge_psize) {
DBG_LOW(" -> huge page !\n");
return hash_huge_page(mm, access, ea, vsid, local, trap);
}
#endif /* CONFIG_HUGETLB_PAGE */
#ifndef CONFIG_PPC_64K_PAGES
/* If we use 4K pages and our psize is not 4K, then we are hitting
* a special driver mapping, we need to align the address before
* we fetch the PTE
*/
if (psize != MMU_PAGE_4K)
ea &= ~((1ul << mmu_psize_defs[psize].shift) - 1);
#endif /* CONFIG_PPC_64K_PAGES */
/* Get PTE and page size from page tables */
ptep = find_linux_pte(pgdir, ea);
@ -702,54 +719,56 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
}
/* Do actual hashing */
#ifndef CONFIG_PPC_64K_PAGES
rc = __hash_page_4K(ea, access, vsid, ptep, trap, local);
#else
#ifdef CONFIG_PPC_64K_PAGES
/* If _PAGE_4K_PFN is set, make sure this is a 4k segment */
if (pte_val(*ptep) & _PAGE_4K_PFN) {
demote_segment_4k(mm, ea);
psize = MMU_PAGE_4K;
}
if (mmu_ci_restrictions) {
/* If this PTE is non-cacheable, switch to 4k */
if (psize == MMU_PAGE_64K &&
(pte_val(*ptep) & _PAGE_NO_CACHE)) {
if (user_region) {
demote_segment_4k(mm, ea);
psize = MMU_PAGE_4K;
} else if (ea < VMALLOC_END) {
/*
* some driver did a non-cacheable mapping
* in vmalloc space, so switch vmalloc
* to 4k pages
*/
printk(KERN_ALERT "Reducing vmalloc segment "
"to 4kB pages because of "
"non-cacheable mapping\n");
psize = mmu_vmalloc_psize = MMU_PAGE_4K;
}
/* If this PTE is non-cacheable and we have restrictions on
* using non cacheable large pages, then we switch to 4k
*/
if (mmu_ci_restrictions && psize == MMU_PAGE_64K &&
(pte_val(*ptep) & _PAGE_NO_CACHE)) {
if (user_region) {
demote_segment_4k(mm, ea);
psize = MMU_PAGE_4K;
} else if (ea < VMALLOC_END) {
/*
* some driver did a non-cacheable mapping
* in vmalloc space, so switch vmalloc
* to 4k pages
*/
printk(KERN_ALERT "Reducing vmalloc segment "
"to 4kB pages because of "
"non-cacheable mapping\n");
psize = mmu_vmalloc_psize = MMU_PAGE_4K;
#ifdef CONFIG_SPE_BASE
spu_flush_all_slbs(mm);
#endif
}
if (user_region) {
if (psize != get_paca()->context.user_psize) {
get_paca()->context = mm->context;
slb_flush_and_rebolt();
}
} else if (get_paca()->vmalloc_sllp !=
mmu_psize_defs[mmu_vmalloc_psize].sllp) {
get_paca()->vmalloc_sllp =
mmu_psize_defs[mmu_vmalloc_psize].sllp;
}
if (user_region) {
if (psize != get_paca()->context.user_psize) {
get_paca()->context.user_psize =
mm->context.user_psize;
slb_flush_and_rebolt();
}
} else if (get_paca()->vmalloc_sllp !=
mmu_psize_defs[mmu_vmalloc_psize].sllp) {
get_paca()->vmalloc_sllp =
mmu_psize_defs[mmu_vmalloc_psize].sllp;
slb_flush_and_rebolt();
}
#endif /* CONFIG_PPC_64K_PAGES */
#ifdef CONFIG_PPC_HAS_HASH_64K
if (psize == MMU_PAGE_64K)
rc = __hash_page_64K(ea, access, vsid, ptep, trap, local);
else
#endif /* CONFIG_PPC_HAS_HASH_64K */
rc = __hash_page_4K(ea, access, vsid, ptep, trap, local);
#endif /* CONFIG_PPC_64K_PAGES */
#ifndef CONFIG_PPC_64K_PAGES
DBG_LOW(" o-pte: %016lx\n", pte_val(*ptep));
@ -772,42 +791,55 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
unsigned long flags;
int local = 0;
/* We don't want huge pages prefaulted for now
*/
if (unlikely(in_hugepage_area(mm->context, ea)))
BUG_ON(REGION_ID(ea) != USER_REGION_ID);
#ifdef CONFIG_PPC_MM_SLICES
/* We only prefault standard pages for now */
if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize));
return;
#endif
DBG_LOW("hash_preload(mm=%p, mm->pgdir=%p, ea=%016lx, access=%lx,"
" trap=%lx\n", mm, mm->pgd, ea, access, trap);
/* Get PTE, VSID, access mask */
/* Get Linux PTE if available */
pgdir = mm->pgd;
if (pgdir == NULL)
return;
ptep = find_linux_pte(pgdir, ea);
if (!ptep)
return;
#ifdef CONFIG_PPC_64K_PAGES
/* If either _PAGE_4K_PFN or _PAGE_NO_CACHE is set (and we are on
* a 64K kernel), then we don't preload, hash_page() will take
* care of it once we actually try to access the page.
* That way we don't have to duplicate all of the logic for segment
* page size demotion here
*/
if (pte_val(*ptep) & (_PAGE_4K_PFN | _PAGE_NO_CACHE))
return;
#endif /* CONFIG_PPC_64K_PAGES */
/* Get VSID */
vsid = get_vsid(mm->context.id, ea);
/* Hash it in */
/* Hash doesn't like irqs */
local_irq_save(flags);
/* Is that local to this CPU ? */
mask = cpumask_of_cpu(smp_processor_id());
if (cpus_equal(mm->cpu_vm_mask, mask))
local = 1;
#ifndef CONFIG_PPC_64K_PAGES
__hash_page_4K(ea, access, vsid, ptep, trap, local);
#else
if (mmu_ci_restrictions) {
/* If this PTE is non-cacheable, switch to 4k */
if (mm->context.user_psize == MMU_PAGE_64K &&
(pte_val(*ptep) & _PAGE_NO_CACHE))
demote_segment_4k(mm, ea);
}
/* Hash it in */
#ifdef CONFIG_PPC_HAS_HASH_64K
if (mm->context.user_psize == MMU_PAGE_64K)
__hash_page_64K(ea, access, vsid, ptep, trap, local);
else
__hash_page_4K(ea, access, vsid, ptep, trap, local);
#endif /* CONFIG_PPC_64K_PAGES */
__hash_page_4K(ea, access, vsid, ptep, trap, local);
local_irq_restore(flags);
}

548
arch/powerpc/mm/hugetlbpage.c
Просмотреть файл

@ -91,7 +91,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
pgd_t *pg;
pud_t *pu;
BUG_ON(! in_hugepage_area(mm->context, addr));
BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize);
addr &= HPAGE_MASK;
@ -119,7 +119,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
pud_t *pu;
hugepd_t *hpdp = NULL;
BUG_ON(! in_hugepage_area(mm->context, addr));
BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize);
addr &= HPAGE_MASK;
@ -302,7 +302,7 @@ void hugetlb_free_pgd_range(struct mmu_gather **tlb,
start = addr;
pgd = pgd_offset((*tlb)->mm, addr);
do {
BUG_ON(! in_hugepage_area((*tlb)->mm->context, addr));
BUG_ON(get_slice_psize((*tlb)->mm, addr) != mmu_huge_psize);
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
@ -331,203 +331,13 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
return __pte(old);
}
struct slb_flush_info {
struct mm_struct *mm;
u16 newareas;
};
static void flush_low_segments(void *parm)
{
struct slb_flush_info *fi = parm;
unsigned long i;
BUILD_BUG_ON((sizeof(fi->newareas)*8) != NUM_LOW_AREAS);
if (current->active_mm != fi->mm)
return;
/* Only need to do anything if this CPU is working in the same
* mm as the one which has changed */
/* update the paca copy of the context struct */
get_paca()->context = current->active_mm->context;
asm volatile("isync" : : : "memory");
for (i = 0; i < NUM_LOW_AREAS; i++) {
if (! (fi->newareas & (1U << i)))
continue;
asm volatile("slbie %0"
: : "r" ((i << SID_SHIFT) | SLBIE_C));
}
asm volatile("isync" : : : "memory");
}
static void flush_high_segments(void *parm)
{
struct slb_flush_info *fi = parm;
unsigned long i, j;
BUILD_BUG_ON((sizeof(fi->newareas)*8) != NUM_HIGH_AREAS);
if (current->active_mm != fi->mm)
return;
/* Only need to do anything if this CPU is working in the same
* mm as the one which has changed */
/* update the paca copy of the context struct */
get_paca()->context = current->active_mm->context;
asm volatile("isync" : : : "memory");
for (i = 0; i < NUM_HIGH_AREAS; i++) {
if (! (fi->newareas & (1U << i)))
continue;
for (j = 0; j < (1UL << (HTLB_AREA_SHIFT-SID_SHIFT)); j++)
asm volatile("slbie %0"
:: "r" (((i << HTLB_AREA_SHIFT)
+ (j << SID_SHIFT)) | SLBIE_C));
}
asm volatile("isync" : : : "memory");
}
static int prepare_low_area_for_htlb(struct mm_struct *mm, unsigned long area)
{
unsigned long start = area << SID_SHIFT;
unsigned long end = (area+1) << SID_SHIFT;
struct vm_area_struct *vma;
BUG_ON(area >= NUM_LOW_AREAS);
/* Check no VMAs are in the region */
vma = find_vma(mm, start);
if (vma && (vma->vm_start < end))
return -EBUSY;
return 0;
}
static int prepare_high_area_for_htlb(struct mm_struct *mm, unsigned long area)
{
unsigned long start = area << HTLB_AREA_SHIFT;
unsigned long end = (area+1) << HTLB_AREA_SHIFT;
struct vm_area_struct *vma;
BUG_ON(area >= NUM_HIGH_AREAS);
/* Hack, so that each addresses is controlled by exactly one
* of the high or low area bitmaps, the first high area starts
* at 4GB, not 0 */
if (start == 0)
start = 0x100000000UL;
/* Check no VMAs are in the region */
vma = find_vma(mm, start);
if (vma && (vma->vm_start < end))
return -EBUSY;
return 0;
}
static int open_low_hpage_areas(struct mm_struct *mm, u16 newareas)
{
unsigned long i;
struct slb_flush_info fi;
BUILD_BUG_ON((sizeof(newareas)*8) != NUM_LOW_AREAS);
BUILD_BUG_ON((sizeof(mm->context.low_htlb_areas)*8) != NUM_LOW_AREAS);
newareas &= ~(mm->context.low_htlb_areas);
if (! newareas)
return 0; /* The segments we want are already open */
for (i = 0; i < NUM_LOW_AREAS; i++)
if ((1 << i) & newareas)
if (prepare_low_area_for_htlb(mm, i) != 0)
return -EBUSY;
mm->context.low_htlb_areas |= newareas;
/* the context change must make it to memory before the flush,
* so that further SLB misses do the right thing. */
mb();
fi.mm = mm;
fi.newareas = newareas;
on_each_cpu(flush_low_segments, &fi, 0, 1);
return 0;
}
static int open_high_hpage_areas(struct mm_struct *mm, u16 newareas)
{
struct slb_flush_info fi;
unsigned long i;
BUILD_BUG_ON((sizeof(newareas)*8) != NUM_HIGH_AREAS);
BUILD_BUG_ON((sizeof(mm->context.high_htlb_areas)*8)
!= NUM_HIGH_AREAS);
newareas &= ~(mm->context.high_htlb_areas);
if (! newareas)
return 0; /* The areas we want are already open */
for (i = 0; i < NUM_HIGH_AREAS; i++)
if ((1 << i) & newareas)
if (prepare_high_area_for_htlb(mm, i) != 0)
return -EBUSY;
mm->context.high_htlb_areas |= newareas;
/* the context change must make it to memory before the flush,
* so that further SLB misses do the right thing. */
mb();
fi.mm = mm;
fi.newareas = newareas;
on_each_cpu(flush_high_segments, &fi, 0, 1);
return 0;
}
int prepare_hugepage_range(unsigned long addr, unsigned long len, pgoff_t pgoff)
{
int err = 0;
if (pgoff & (~HPAGE_MASK >> PAGE_SHIFT))
return -EINVAL;
if (len & ~HPAGE_MASK)
return -EINVAL;
if (addr & ~HPAGE_MASK)
return -EINVAL;
if (addr < 0x100000000UL)
err = open_low_hpage_areas(current->mm,
LOW_ESID_MASK(addr, len));
if ((addr + len) > 0x100000000UL)
err = open_high_hpage_areas(current->mm,
HTLB_AREA_MASK(addr, len));
#ifdef CONFIG_SPE_BASE
spu_flush_all_slbs(current->mm);
#endif
if (err) {
printk(KERN_DEBUG "prepare_hugepage_range(%lx, %lx)"
" failed (lowmask: 0x%04hx, highmask: 0x%04hx)\n",
addr, len,
LOW_ESID_MASK(addr, len), HTLB_AREA_MASK(addr, len));
return err;
}
return 0;
}
struct page *
follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
{
pte_t *ptep;
struct page *page;
if (! in_hugepage_area(mm->context, address))
if (get_slice_psize(mm, address) != mmu_huge_psize)
return ERR_PTR(-EINVAL);
ptep = huge_pte_offset(mm, address);
@ -551,359 +361,13 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address,
return NULL;
}
/* Because we have an exclusive hugepage region which lies within the
* normal user address space, we have to take special measures to make
* non-huge mmap()s evade the hugepage reserved regions. */
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
unsigned long start_addr;
if (len > TASK_SIZE)
return -ENOMEM;
/* handle fixed mapping: prevent overlap with huge pages */
if (flags & MAP_FIXED) {
if (is_hugepage_only_range(mm, addr, len))
return -EINVAL;
return addr;
}
if (addr) {
addr = PAGE_ALIGN(addr);
vma = find_vma(mm, addr);
if (((TASK_SIZE - len) >= addr)
&& (!vma || (addr+len) <= vma->vm_start)
&& !is_hugepage_only_range(mm, addr,len))
return addr;
}
if (len > mm->cached_hole_size) {
start_addr = addr = mm->free_area_cache;
} else {
start_addr = addr = TASK_UNMAPPED_BASE;
mm->cached_hole_size = 0;
}
full_search:
vma = find_vma(mm, addr);
while (TASK_SIZE - len >= addr) {
BUG_ON(vma && (addr >= vma->vm_end));
if (touches_hugepage_low_range(mm, addr, len)) {
addr = ALIGN(addr+1, 1<<SID_SHIFT);
vma = find_vma(mm, addr);
continue;
}
if (touches_hugepage_high_range(mm, addr, len)) {
addr = ALIGN(addr+1, 1UL<<HTLB_AREA_SHIFT);
vma = find_vma(mm, addr);
continue;
}
if (!vma || addr + len <= vma->vm_start) {
/*
* Remember the place where we stopped the search:
*/
mm->free_area_cache = addr + len;
return addr;
}
if (addr + mm->cached_hole_size < vma->vm_start)
mm->cached_hole_size = vma->vm_start - addr;
addr = vma->vm_end;
vma = vma->vm_next;
}
/* Make sure we didn't miss any holes */
if (start_addr != TASK_UNMAPPED_BASE) {
start_addr = addr = TASK_UNMAPPED_BASE;
mm->cached_hole_size = 0;
goto full_search;
}
return -ENOMEM;
}
/*
* This mmap-allocator allocates new areas top-down from below the
* stack's low limit (the base):
*
* Because we have an exclusive hugepage region which lies within the
* normal user address space, we have to take special measures to make
* non-huge mmap()s evade the hugepage reserved regions.
*/
unsigned long
arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
const unsigned long len, const unsigned long pgoff,
const unsigned long flags)
{
struct vm_area_struct *vma, *prev_vma;
struct mm_struct *mm = current->mm;
unsigned long base = mm->mmap_base, addr = addr0;
unsigned long largest_hole = mm->cached_hole_size;
int first_time = 1;
/* requested length too big for entire address space */
if (len > TASK_SIZE)
return -ENOMEM;
/* handle fixed mapping: prevent overlap with huge pages */
if (flags & MAP_FIXED) {
if (is_hugepage_only_range(mm, addr, len))
return -EINVAL;
return addr;
}
/* dont allow allocations above current base */
if (mm->free_area_cache > base)
mm->free_area_cache = base;
/* requesting a specific address */
if (addr) {
addr = PAGE_ALIGN(addr);
vma = find_vma(mm, addr);
if (TASK_SIZE - len >= addr &&
(!vma || addr + len <= vma->vm_start)
&& !is_hugepage_only_range(mm, addr,len))
return addr;
}
if (len <= largest_hole) {
largest_hole = 0;
mm->free_area_cache = base;
}
try_again:
/* make sure it can fit in the remaining address space */
if (mm->free_area_cache < len)
goto fail;
/* either no address requested or cant fit in requested address hole */
addr = (mm->free_area_cache - len) & PAGE_MASK;
do {
hugepage_recheck:
if (touches_hugepage_low_range(mm, addr, len)) {
addr = (addr & ((~0) << SID_SHIFT)) - len;
goto hugepage_recheck;
} else if (touches_hugepage_high_range(mm, addr, len)) {
addr = (addr & ((~0UL) << HTLB_AREA_SHIFT)) - len;
goto hugepage_recheck;
}
/*
* Lookup failure means no vma is above this address,
* i.e. return with success:
*/
if (!(vma = find_vma_prev(mm, addr, &prev_vma)))
return addr;
/*
* new region fits between prev_vma->vm_end and
* vma->vm_start, use it:
*/
if (addr+len <= vma->vm_start &&
(!prev_vma || (addr >= prev_vma->vm_end))) {
/* remember the address as a hint for next time */
mm->cached_hole_size = largest_hole;
return (mm->free_area_cache = addr);
} else {
/* pull free_area_cache down to the first hole */
if (mm->free_area_cache == vma->vm_end) {
mm->free_area_cache = vma->vm_start;
mm->cached_hole_size = largest_hole;
}
}
/* remember the largest hole we saw so far */
if (addr + largest_hole < vma->vm_start)
largest_hole = vma->vm_start - addr;
/* try just below the current vma->vm_start */
addr = vma->vm_start-len;
} while (len <= vma->vm_start);
fail:
/*
* if hint left us with no space for the requested
* mapping then try again:
*/
if (first_time) {
mm->free_area_cache = base;
largest_hole = 0;
first_time = 0;
goto try_again;
}
/*
* A failed mmap() very likely causes application failure,
* so fall back to the bottom-up function here. This scenario
* can happen with large stack limits and large mmap()
* allocations.
*/
mm->free_area_cache = TASK_UNMAPPED_BASE;
mm->cached_hole_size = ~0UL;
addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
/*
* Restore the topdown base:
*/
mm->free_area_cache = base;
mm->cached_hole_size = ~0UL;
return addr;
}
static int htlb_check_hinted_area(unsigned long addr, unsigned long len)
{
struct vm_area_struct *vma;
vma = find_vma(current->mm, addr);
if (TASK_SIZE - len >= addr &&
(!vma || ((addr + len) <= vma->vm_start)))
return 0;
return -ENOMEM;
}
static unsigned long htlb_get_low_area(unsigned long len, u16 segmask)
{
unsigned long addr = 0;
struct vm_area_struct *vma;
vma = find_vma(current->mm, addr);
while (addr + len <= 0x100000000UL) {
BUG_ON(vma && (addr >= vma->vm_end)); /* invariant */
if (! __within_hugepage_low_range(addr, len, segmask)) {
addr = ALIGN(addr+1, 1<<SID_SHIFT);
vma = find_vma(current->mm, addr);
continue;
}
if (!vma || (addr + len) <= vma->vm_start)
return addr;
addr = ALIGN(vma->vm_end, HPAGE_SIZE);
/* Depending on segmask this might not be a confirmed
* hugepage region, so the ALIGN could have skipped
* some VMAs */
vma = find_vma(current->mm, addr);
}
return -ENOMEM;
}
static unsigned long htlb_get_high_area(unsigned long len, u16 areamask)
{
unsigned long addr = 0x100000000UL;
struct vm_area_struct *vma;
vma = find_vma(current->mm, addr);
while (addr + len <= TASK_SIZE_USER64) {
BUG_ON(vma && (addr >= vma->vm_end)); /* invariant */
if (! __within_hugepage_high_range(addr, len, areamask)) {
addr = ALIGN(addr+1, 1UL<<HTLB_AREA_SHIFT);
vma = find_vma(current->mm, addr);
continue;
}
if (!vma || (addr + len) <= vma->vm_start)
return addr;
addr = ALIGN(vma->vm_end, HPAGE_SIZE);
/* Depending on segmask this might not be a confirmed
* hugepage region, so the ALIGN could have skipped
* some VMAs */
vma = find_vma(current->mm, addr);
}
return -ENOMEM;
}
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
int lastshift;
u16 areamask, curareas;
if (HPAGE_SHIFT == 0)
return -EINVAL;
if (len & ~HPAGE_MASK)
return -EINVAL;
if (len > TASK_SIZE)
return -ENOMEM;
if (!cpu_has_feature(CPU_FTR_16M_PAGE))
return -EINVAL;
/* Paranoia, caller should have dealt with this */
BUG_ON((addr + len) < addr);
/* Handle MAP_FIXED */
if (flags & MAP_FIXED) {
if (prepare_hugepage_range(addr, len, pgoff))
return -EINVAL;
return addr;
}
if (test_thread_flag(TIF_32BIT)) {
curareas = current->mm->context.low_htlb_areas;
/* First see if we can use the hint address */
if (addr && (htlb_check_hinted_area(addr, len) == 0)) {
areamask = LOW_ESID_MASK(addr, len);
if (open_low_hpage_areas(current->mm, areamask) == 0)
return addr;
}
/* Next see if we can map in the existing low areas */
addr = htlb_get_low_area(len, curareas);
if (addr != -ENOMEM)
return addr;
/* Finally go looking for areas to open */
lastshift = 0;
for (areamask = LOW_ESID_MASK(0x100000000UL-len, len);
! lastshift; areamask >>=1) {
if (areamask & 1)
lastshift = 1;
addr = htlb_get_low_area(len, curareas | areamask);
if ((addr != -ENOMEM)
&& open_low_hpage_areas(current->mm, areamask) == 0)
return addr;
}
} else {
curareas = current->mm->context.high_htlb_areas;
/* First see if we can use the hint address */
/* We discourage 64-bit processes from doing hugepage
* mappings below 4GB (must use MAP_FIXED) */
if ((addr >= 0x100000000UL)
&& (htlb_check_hinted_area(addr, len) == 0)) {
areamask = HTLB_AREA_MASK(addr, len);
if (open_high_hpage_areas(current->mm, areamask) == 0)
return addr;
}
/* Next see if we can map in the existing high areas */
addr = htlb_get_high_area(len, curareas);
if (addr != -ENOMEM)
return addr;
/* Finally go looking for areas to open */
lastshift = 0;
for (areamask = HTLB_AREA_MASK(TASK_SIZE_USER64-len, len);
! lastshift; areamask >>=1) {
if (areamask & 1)
lastshift = 1;
addr = htlb_get_high_area(len, curareas | areamask);
if ((addr != -ENOMEM)
&& open_high_hpage_areas(current->mm, areamask) == 0)
return addr;
}
}
printk(KERN_DEBUG "hugetlb_get_unmapped_area() unable to open"
" enough areas\n");
return -ENOMEM;
return slice_get_unmapped_area(addr, len, flags,
mmu_huge_psize, 1, 0);
}
/*

17
arch/powerpc/mm/init_64.c
Просмотреть файл

@ -146,21 +146,16 @@ static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags)
memset(addr, 0, kmem_cache_size(cache));
}
#ifdef CONFIG_PPC_64K_PAGES
static const unsigned int pgtable_cache_size[3] = {
PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE
};
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
"pte_pmd_cache", "pmd_cache", "pgd_cache",
};
#else
static const unsigned int pgtable_cache_size[2] = {
PTE_TABLE_SIZE, PMD_TABLE_SIZE
PGD_TABLE_SIZE, PMD_TABLE_SIZE
};
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
"pgd_pte_cache", "pud_pmd_cache",
};
#ifdef CONFIG_PPC_64K_PAGES
"pgd_cache", "pmd_cache",
#else
"pgd_cache", "pud_pmd_cache",
#endif /* CONFIG_PPC_64K_PAGES */
};
#ifdef CONFIG_HUGETLB_PAGE
/* Hugepages need one extra cache, initialized in hugetlbpage.c. We

25
arch/powerpc/mm/mem.c
Просмотреть файл

@ -31,6 +31,7 @@
#include <linux/highmem.h>
#include <linux/initrd.h>
#include <linux/pagemap.h>
#include <linux/suspend.h>
#include <asm/pgalloc.h>
#include <asm/prom.h>
@ -276,6 +277,28 @@ void __init do_init_bootmem(void)
init_bootmem_done = 1;
}
/* mark pages that don't exist as nosave */
static int __init mark_nonram_nosave(void)
{
unsigned long lmb_next_region_start_pfn,
lmb_region_max_pfn;
int i;
for (i = 0; i < lmb.memory.cnt - 1; i++) {
lmb_region_max_pfn =
(lmb.memory.region[i].base >> PAGE_SHIFT) +
(lmb.memory.region[i].size >> PAGE_SHIFT);
lmb_next_region_start_pfn =
lmb.memory.region[i+1].base >> PAGE_SHIFT;
if (lmb_region_max_pfn < lmb_next_region_start_pfn)
register_nosave_region(lmb_region_max_pfn,
lmb_next_region_start_pfn);
}
return 0;
}
/*
* paging_init() sets up the page tables - in fact we've already done this.
*/
@ -307,6 +330,8 @@ void __init paging_init(void)
max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
#endif
free_area_init_nodes(max_zone_pfns);
mark_nonram_nosave();
}
#endif /* ! CONFIG_NEED_MULTIPLE_NODES */

10
arch/powerpc/mm/mmu_context_64.c
Просмотреть файл

@ -28,6 +28,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
int index;
int err;
int new_context = (mm->context.id == 0);
again:
if (!idr_pre_get(&mmu_context_idr, GFP_KERNEL))
@ -50,9 +51,18 @@ again:
}
mm->context.id = index;
#ifdef CONFIG_PPC_MM_SLICES
/* The old code would re-promote on fork, we don't do that
* when using slices as it could cause problem promoting slices
* that have been forced down to 4K
*/
if (new_context)
slice_set_user_psize(mm, mmu_virtual_psize);
#else
mm->context.user_psize = mmu_virtual_psize;
mm->context.sllp = SLB_VSID_USER |
mmu_psize_defs[mmu_virtual_psize].sllp;
#endif
return 0;
}

2
arch/powerpc/mm/ppc_mmu_32.c
Просмотреть файл

@ -185,7 +185,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
if (Hash == 0)
return;
pmd = pmd_offset(pgd_offset(mm, ea), ea);
pmd = pmd_offset(pud_offset(pgd_offset(mm, ea), ea), ea);
if (!pmd_none(*pmd))
add_hash_page(mm->context.id, ea, pmd_val(*pmd));
}

11
arch/powerpc/mm/slb.c
Просмотреть файл

@ -198,12 +198,6 @@ void slb_initialize(void)
static int slb_encoding_inited;
extern unsigned int *slb_miss_kernel_load_linear;
extern unsigned int *slb_miss_kernel_load_io;
#ifdef CONFIG_HUGETLB_PAGE
extern unsigned int *slb_miss_user_load_huge;
unsigned long huge_llp;
huge_llp = mmu_psize_defs[mmu_huge_psize].sllp;
#endif
/* Prepare our SLB miss handler based on our page size */
linear_llp = mmu_psize_defs[mmu_linear_psize].sllp;
@ -220,11 +214,6 @@ void slb_initialize(void)
DBG("SLB: linear LLP = %04x\n", linear_llp);
DBG("SLB: io LLP = %04x\n", io_llp);
#ifdef CONFIG_HUGETLB_PAGE
patch_slb_encoding(slb_miss_user_load_huge,
SLB_VSID_USER | huge_llp);
DBG("SLB: huge LLP = %04x\n", huge_llp);
#endif
}
get_paca()->stab_rr = SLB_NUM_BOLTED;

52
arch/powerpc/mm/slb_low.S
Просмотреть файл

@ -82,31 +82,45 @@ _GLOBAL(slb_miss_kernel_load_io)
srdi. r9,r10,USER_ESID_BITS
bne- 8f /* invalid ea bits set */
/* Figure out if the segment contains huge pages */
#ifdef CONFIG_HUGETLB_PAGE
BEGIN_FTR_SECTION
b 1f
END_FTR_SECTION_IFCLR(CPU_FTR_16M_PAGE)
/* when using slices, we extract the psize off the slice bitmaps
* and then we need to get the sllp encoding off the mmu_psize_defs
* array.
*
* XXX This is a bit inefficient especially for the normal case,
* so we should try to implement a fast path for the standard page
* size using the old sllp value so we avoid the array. We cannot
* really do dynamic patching unfortunately as processes might flip
* between 4k and 64k standard page size
*/
#ifdef CONFIG_PPC_MM_SLICES
cmpldi r10,16
lhz r9,PACALOWHTLBAREAS(r13)
mr r11,r10
/* Get the slice index * 4 in r11 and matching slice size mask in r9 */
ld r9,PACALOWSLICESPSIZE(r13)
sldi r11,r10,2
blt 5f
ld r9,PACAHIGHSLICEPSIZE(r13)
srdi r11,r10,(SLICE_HIGH_SHIFT - SLICE_LOW_SHIFT - 2)
andi. r11,r11,0x3c
lhz r9,PACAHIGHHTLBAREAS(r13)
srdi r11,r10,(HTLB_AREA_SHIFT-SID_SHIFT)
5: srd r9,r9,r11
andi. r9,r9,1
beq 1f
_GLOBAL(slb_miss_user_load_huge)
li r11,0
b 2f
1:
#endif /* CONFIG_HUGETLB_PAGE */
5: /* Extract the psize and multiply to get an array offset */
srd r9,r9,r11
andi. r9,r9,0xf
mulli r9,r9,MMUPSIZEDEFSIZE
/* Now get to the array and obtain the sllp
*/
ld r11,PACATOC(r13)
ld r11,mmu_psize_defs@got(r11)
add r11,r11,r9
ld r11,MMUPSIZESLLP(r11)
ori r11,r11,SLB_VSID_USER
#else
/* paca context sllp already contains the SLB_VSID_USER bits */
lhz r11,PACACONTEXTSLLP(r13)
2:
#endif /* CONFIG_PPC_MM_SLICES */
ld r9,PACACONTEXTID(r13)
rldimi r10,r9,USER_ESID_BITS,0
b slb_finish_load

633
arch/powerpc/mm/slice.c Normal file
Просмотреть файл

@ -0,0 +1,633 @@
/*
* address space "slices" (meta-segments) support
*
* Copyright (C) 2007 Benjamin Herrenschmidt, IBM Corporation.
*
* Based on hugetlb implementation
*
* Copyright (C) 2003 David Gibson, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <asm/mman.h>
#include <asm/mmu.h>
#include <asm/spu.h>
static spinlock_t slice_convert_lock = SPIN_LOCK_UNLOCKED;
#ifdef DEBUG
int _slice_debug = 1;
static void slice_print_mask(const char *label, struct slice_mask mask)
{
char *p, buf[16 + 3 + 16 + 1];
int i;
if (!_slice_debug)
return;
p = buf;
for (i = 0; i < SLICE_NUM_LOW; i++)
*(p++) = (mask.low_slices & (1 << i)) ? '1' : '0';
*(p++) = ' ';
*(p++) = '-';
*(p++) = ' ';
for (i = 0; i < SLICE_NUM_HIGH; i++)
*(p++) = (mask.high_slices & (1 << i)) ? '1' : '0';
*(p++) = 0;
printk(KERN_DEBUG "%s:%s\n", label, buf);
}
#define slice_dbg(fmt...) do { if (_slice_debug) pr_debug(fmt); } while(0)
#else
static void slice_print_mask(const char *label, struct slice_mask mask) {}
#define slice_dbg(fmt...)
#endif
static struct slice_mask slice_range_to_mask(unsigned long start,
unsigned long len)
{
unsigned long end = start + len - 1;
struct slice_mask ret = { 0, 0 };
if (start < SLICE_LOW_TOP) {
unsigned long mend = min(end, SLICE_LOW_TOP);
unsigned long mstart = min(start, SLICE_LOW_TOP);
ret.low_slices = (1u << (GET_LOW_SLICE_INDEX(mend) + 1))
- (1u << GET_LOW_SLICE_INDEX(mstart));
}
if ((start + len) > SLICE_LOW_TOP)
ret.high_slices = (1u << (GET_HIGH_SLICE_INDEX(end) + 1))
- (1u << GET_HIGH_SLICE_INDEX(start));
return ret;
}
static int slice_area_is_free(struct mm_struct *mm, unsigned long addr,
unsigned long len)
{
struct vm_area_struct *vma;
if ((mm->task_size - len) < addr)
return 0;
vma = find_vma(mm, addr);
return (!vma || (addr + len) <= vma->vm_start);
}
static int slice_low_has_vma(struct mm_struct *mm, unsigned long slice)
{
return !slice_area_is_free(mm, slice << SLICE_LOW_SHIFT,
1ul << SLICE_LOW_SHIFT);
}
static int slice_high_has_vma(struct mm_struct *mm, unsigned long slice)
{
unsigned long start = slice << SLICE_HIGH_SHIFT;
unsigned long end = start + (1ul << SLICE_HIGH_SHIFT);
/* Hack, so that each addresses is controlled by exactly one
* of the high or low area bitmaps, the first high area starts
* at 4GB, not 0 */
if (start == 0)
start = SLICE_LOW_TOP;
return !slice_area_is_free(mm, start, end - start);
}
static struct slice_mask slice_mask_for_free(struct mm_struct *mm)
{
struct slice_mask ret = { 0, 0 };
unsigned long i;
for (i = 0; i < SLICE_NUM_LOW; i++)
if (!slice_low_has_vma(mm, i))
ret.low_slices |= 1u << i;
if (mm->task_size <= SLICE_LOW_TOP)
return ret;
for (i = 0; i < SLICE_NUM_HIGH; i++)
if (!slice_high_has_vma(mm, i))
ret.high_slices |= 1u << i;
return ret;
}
static struct slice_mask slice_mask_for_size(struct mm_struct *mm, int psize)
{
struct slice_mask ret = { 0, 0 };
unsigned long i;
u64 psizes;
psizes = mm->context.low_slices_psize;
for (i = 0; i < SLICE_NUM_LOW; i++)
if (((psizes >> (i * 4)) & 0xf) == psize)
ret.low_slices |= 1u << i;
psizes = mm->context.high_slices_psize;
for (i = 0; i < SLICE_NUM_HIGH; i++)
if (((psizes >> (i * 4)) & 0xf) == psize)
ret.high_slices |= 1u << i;
return ret;
}
static int slice_check_fit(struct slice_mask mask, struct slice_mask available)
{
return (mask.low_slices & available.low_slices) == mask.low_slices &&
(mask.high_slices & available.high_slices) == mask.high_slices;
}
static void slice_flush_segments(void *parm)
{
struct mm_struct *mm = parm;
unsigned long flags;
if (mm != current->active_mm)
return;
/* update the paca copy of the context struct */
get_paca()->context = current->active_mm->context;
local_irq_save(flags);
slb_flush_and_rebolt();
local_irq_restore(flags);
}
static void slice_convert(struct mm_struct *mm, struct slice_mask mask, int psize)
{
/* Write the new slice psize bits */
u64 lpsizes, hpsizes;
unsigned long i, flags;
slice_dbg("slice_convert(mm=%p, psize=%d)\n", mm, psize);
slice_print_mask(" mask", mask);
/* We need to use a spinlock here to protect against
* concurrent 64k -> 4k demotion ...
*/
spin_lock_irqsave(&slice_convert_lock, flags);
lpsizes = mm->context.low_slices_psize;
for (i = 0; i < SLICE_NUM_LOW; i++)
if (mask.low_slices & (1u << i))
lpsizes = (lpsizes & ~(0xful << (i * 4))) |
(((unsigned long)psize) << (i * 4));
hpsizes = mm->context.high_slices_psize;
for (i = 0; i < SLICE_NUM_HIGH; i++)
if (mask.high_slices & (1u << i))
hpsizes = (hpsizes & ~(0xful << (i * 4))) |
(((unsigned long)psize) << (i * 4));
mm->context.low_slices_psize = lpsizes;
mm->context.high_slices_psize = hpsizes;
slice_dbg(" lsps=%lx, hsps=%lx\n",
mm->context.low_slices_psize,
mm->context.high_slices_psize);
spin_unlock_irqrestore(&slice_convert_lock, flags);
mb();
/* XXX this is sub-optimal but will do for now */
on_each_cpu(slice_flush_segments, mm, 0, 1);
#ifdef CONFIG_SPU_BASE
spu_flush_all_slbs(mm);
#endif
}
static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
unsigned long len,
struct slice_mask available,
int psize, int use_cache)
{
struct vm_area_struct *vma;
unsigned long start_addr, addr;
struct slice_mask mask;
int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
if (use_cache) {
if (len <= mm->cached_hole_size) {
start_addr = addr = TASK_UNMAPPED_BASE;
mm->cached_hole_size = 0;
} else
start_addr = addr = mm->free_area_cache;
} else
start_addr = addr = TASK_UNMAPPED_BASE;
full_search:
for (;;) {
addr = _ALIGN_UP(addr, 1ul << pshift);
if ((TASK_SIZE - len) < addr)
break;
vma = find_vma(mm, addr);
BUG_ON(vma && (addr >= vma->vm_end));
mask = slice_range_to_mask(addr, len);
if (!slice_check_fit(mask, available)) {
if (addr < SLICE_LOW_TOP)
addr = _ALIGN_UP(addr + 1, 1ul << SLICE_LOW_SHIFT);
else
addr = _ALIGN_UP(addr + 1, 1ul << SLICE_HIGH_SHIFT);
continue;
}
if (!vma || addr + len <= vma->vm_start) {
/*
* Remember the place where we stopped the search:
*/
if (use_cache)
mm->free_area_cache = addr + len;
return addr;
}
if (use_cache && (addr + mm->cached_hole_size) < vma->vm_start)
mm->cached_hole_size = vma->vm_start - addr;
addr = vma->vm_end;
}
/* Make sure we didn't miss any holes */
if (use_cache && start_addr != TASK_UNMAPPED_BASE) {
start_addr = addr = TASK_UNMAPPED_BASE;
mm->cached_hole_size = 0;
goto full_search;
}
return -ENOMEM;
}
static unsigned long slice_find_area_topdown(struct mm_struct *mm,
unsigned long len,
struct slice_mask available,
int psize, int use_cache)
{
struct vm_area_struct *vma;
unsigned long addr;
struct slice_mask mask;
int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
/* check if free_area_cache is useful for us */
if (use_cache) {
if (len <= mm->cached_hole_size) {
mm->cached_hole_size = 0;
mm->free_area_cache = mm->mmap_base;
}
/* either no address requested or can't fit in requested
* address hole
*/
addr = mm->free_area_cache;
/* make sure it can fit in the remaining address space */
if (addr > len) {
addr = _ALIGN_DOWN(addr - len, 1ul << pshift);
mask = slice_range_to_mask(addr, len);
if (slice_check_fit(mask, available) &&
slice_area_is_free(mm, addr, len))
/* remember the address as a hint for
* next time
*/
return (mm->free_area_cache = addr);
}
}
addr = mm->mmap_base;
while (addr > len) {
/* Go down by chunk size */
addr = _ALIGN_DOWN(addr - len, 1ul << pshift);
/* Check for hit with different page size */
mask = slice_range_to_mask(addr, len);
if (!slice_check_fit(mask, available)) {
if (addr < SLICE_LOW_TOP)
addr = _ALIGN_DOWN(addr, 1ul << SLICE_LOW_SHIFT);
else if (addr < (1ul << SLICE_HIGH_SHIFT))
addr = SLICE_LOW_TOP;
else
addr = _ALIGN_DOWN(addr, 1ul << SLICE_HIGH_SHIFT);
continue;
}
/*
* Lookup failure means no vma is above this address,
* else if new region fits below vma->vm_start,
* return with success:
*/
vma = find_vma(mm, addr);
if (!vma || (addr + len) <= vma->vm_start) {
/* remember the address as a hint for next time */
if (use_cache)
mm->free_area_cache = addr;
return addr;
}
/* remember the largest hole we saw so far */
if (use_cache && (addr + mm->cached_hole_size) < vma->vm_start)
mm->cached_hole_size = vma->vm_start - addr;
/* try just below the current vma->vm_start */
addr = vma->vm_start;
}
/*
* A failed mmap() very likely causes application failure,
* so fall back to the bottom-up function here. This scenario
* can happen with large stack limits and large mmap()
* allocations.
*/
addr = slice_find_area_bottomup(mm, len, available, psize, 0);
/*
* Restore the topdown base:
*/
if (use_cache) {
mm->free_area_cache = mm->mmap_base;
mm->cached_hole_size = ~0UL;
}
return addr;
}
static unsigned long slice_find_area(struct mm_struct *mm, unsigned long len,
struct slice_mask mask, int psize,
int topdown, int use_cache)
{
if (topdown)
return slice_find_area_topdown(mm, len, mask, psize, use_cache);
else
return slice_find_area_bottomup(mm, len, mask, psize, use_cache);
}
unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
unsigned long flags, unsigned int psize,
int topdown, int use_cache)
{
struct slice_mask mask;
struct slice_mask good_mask;
struct slice_mask potential_mask = {0,0} /* silence stupid warning */;
int pmask_set = 0;
int fixed = (flags & MAP_FIXED);
int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
struct mm_struct *mm = current->mm;
/* Sanity checks */
BUG_ON(mm->task_size == 0);
slice_dbg("slice_get_unmapped_area(mm=%p, psize=%d...\n", mm, psize);
slice_dbg(" addr=%lx, len=%lx, flags=%lx, topdown=%d, use_cache=%d\n",
addr, len, flags, topdown, use_cache);
if (len > mm->task_size)
return -ENOMEM;
if (fixed && (addr & ((1ul << pshift) - 1)))
return -EINVAL;
if (fixed && addr > (mm->task_size - len))
return -EINVAL;
/* If hint, make sure it matches our alignment restrictions */
if (!fixed && addr) {
addr = _ALIGN_UP(addr, 1ul << pshift);
slice_dbg(" aligned addr=%lx\n", addr);
}
/* First makeup a "good" mask of slices that have the right size
* already
*/
good_mask = slice_mask_for_size(mm, psize);
slice_print_mask(" good_mask", good_mask);
/* First check hint if it's valid or if we have MAP_FIXED */
if ((addr != 0 || fixed) && (mm->task_size - len) >= addr) {
/* Don't bother with hint if it overlaps a VMA */
if (!fixed && !slice_area_is_free(mm, addr, len))
goto search;
/* Build a mask for the requested range */
mask = slice_range_to_mask(addr, len);
slice_print_mask(" mask", mask);
/* Check if we fit in the good mask. If we do, we just return,
* nothing else to do
*/
if (slice_check_fit(mask, good_mask)) {
slice_dbg(" fits good !\n");
return addr;
}
/* We don't fit in the good mask, check what other slices are
* empty and thus can be converted
*/
potential_mask = slice_mask_for_free(mm);
potential_mask.low_slices |= good_mask.low_slices;
potential_mask.high_slices |= good_mask.high_slices;
pmask_set = 1;
slice_print_mask(" potential", potential_mask);
if (slice_check_fit(mask, potential_mask)) {
slice_dbg(" fits potential !\n");
goto convert;
}
}
/* If we have MAP_FIXED and failed the above step, then error out */
if (fixed)
return -EBUSY;
search:
slice_dbg(" search...\n");
/* Now let's see if we can find something in the existing slices
* for that size
*/
addr = slice_find_area(mm, len, good_mask, psize, topdown, use_cache);
if (addr != -ENOMEM) {
/* Found within the good mask, we don't have to setup,
* we thus return directly
*/
slice_dbg(" found area at 0x%lx\n", addr);
return addr;
}
/* Won't fit, check what can be converted */
if (!pmask_set) {
potential_mask = slice_mask_for_free(mm);
potential_mask.low_slices |= good_mask.low_slices;
potential_mask.high_slices |= good_mask.high_slices;
pmask_set = 1;
slice_print_mask(" potential", potential_mask);
}
/* Now let's see if we can find something in the existing slices
* for that size
*/
addr = slice_find_area(mm, len, potential_mask, psize, topdown,
use_cache);
if (addr == -ENOMEM)
return -ENOMEM;
mask = slice_range_to_mask(addr, len);
slice_dbg(" found potential area at 0x%lx\n", addr);
slice_print_mask(" mask", mask);
convert:
slice_convert(mm, mask, psize);
return addr;
}
EXPORT_SYMBOL_GPL(slice_get_unmapped_area);
unsigned long arch_get_unmapped_area(struct file *filp,
unsigned long addr,
unsigned long len,
unsigned long pgoff,
unsigned long flags)
{
return slice_get_unmapped_area(addr, len, flags,
current->mm->context.user_psize,
0, 1);
}
unsigned long arch_get_unmapped_area_topdown(struct file *filp,
const unsigned long addr0,
const unsigned long len,
const unsigned long pgoff,
const unsigned long flags)
{
return slice_get_unmapped_area(addr0, len, flags,
current->mm->context.user_psize,
1, 1);
}
unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr)
{
u64 psizes;
int index;
if (addr < SLICE_LOW_TOP) {
psizes = mm->context.low_slices_psize;
index = GET_LOW_SLICE_INDEX(addr);
} else {
psizes = mm->context.high_slices_psize;
index = GET_HIGH_SLICE_INDEX(addr);
}
return (psizes >> (index * 4)) & 0xf;
}
EXPORT_SYMBOL_GPL(get_slice_psize);
/*
* This is called by hash_page when it needs to do a lazy conversion of
* an address space from real 64K pages to combo 4K pages (typically
* when hitting a non cacheable mapping on a processor or hypervisor
* that won't allow them for 64K pages).
*
* This is also called in init_new_context() to change back the user
* psize from whatever the parent context had it set to
*
* This function will only change the content of the {low,high)_slice_psize
* masks, it will not flush SLBs as this shall be handled lazily by the
* caller.
*/
void slice_set_user_psize(struct mm_struct *mm, unsigned int psize)
{
unsigned long flags, lpsizes, hpsizes;
unsigned int old_psize;
int i;
slice_dbg("slice_set_user_psize(mm=%p, psize=%d)\n", mm, psize);
spin_lock_irqsave(&slice_convert_lock, flags);
old_psize = mm->context.user_psize;
slice_dbg(" old_psize=%d\n", old_psize);
if (old_psize == psize)
goto bail;
mm->context.user_psize = psize;
wmb();
lpsizes = mm->context.low_slices_psize;
for (i = 0; i < SLICE_NUM_LOW; i++)
if (((lpsizes >> (i * 4)) & 0xf) == old_psize)
lpsizes = (lpsizes & ~(0xful << (i * 4))) |
(((unsigned long)psize) << (i * 4));
hpsizes = mm->context.high_slices_psize;
for (i = 0; i < SLICE_NUM_HIGH; i++)
if (((hpsizes >> (i * 4)) & 0xf) == old_psize)
hpsizes = (hpsizes & ~(0xful << (i * 4))) |
(((unsigned long)psize) << (i * 4));
mm->context.low_slices_psize = lpsizes;
mm->context.high_slices_psize = hpsizes;
slice_dbg(" lsps=%lx, hsps=%lx\n",
mm->context.low_slices_psize,
mm->context.high_slices_psize);
bail:
spin_unlock_irqrestore(&slice_convert_lock, flags);
}
/*
* is_hugepage_only_range() is used by generic code to verify wether
* a normal mmap mapping (non hugetlbfs) is valid on a given area.
*
* until the generic code provides a more generic hook and/or starts
* calling arch get_unmapped_area for MAP_FIXED (which our implementation
* here knows how to deal with), we hijack it to keep standard mappings
* away from us.
*
* because of that generic code limitation, MAP_FIXED mapping cannot
* "convert" back a slice with no VMAs to the standard page size, only
* get_unmapped_area() can. It would be possible to fix it here but I
* prefer working on fixing the generic code instead.
*
* WARNING: This will not work if hugetlbfs isn't enabled since the
* generic code will redefine that function as 0 in that. This is ok
* for now as we only use slices with hugetlbfs enabled. This should
* be fixed as the generic code gets fixed.
*/
int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
unsigned long len)
{
struct slice_mask mask, available;
mask = slice_range_to_mask(addr, len);
available = slice_mask_for_size(mm, mm->context.user_psize);
#if 0 /* too verbose */
slice_dbg("is_hugepage_only_range(mm=%p, addr=%lx, len=%lx)\n",
mm, addr, len);
slice_print_mask(" mask", mask);
slice_print_mask(" available", available);
#endif
return !slice_check_fit(mask, available);
}

4
arch/powerpc/mm/tlb_32.c
Просмотреть файл

@ -111,7 +111,7 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
if (start >= end)
return;
end = (end - 1) | ~PAGE_MASK;
pmd = pmd_offset(pgd_offset(mm, start), start);
pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start);
for (;;) {
pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
if (pmd_end > end)
@ -169,7 +169,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
return;
}
mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
pmd = pmd_offset(pgd_offset(mm, vmaddr), vmaddr);
pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr);
if (!pmd_none(*pmd))
flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
FINISH_FLUSH;

12
arch/powerpc/mm/tlb_64.c
Просмотреть файл

@ -143,16 +143,22 @@ void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
*/
addr &= PAGE_MASK;
/* Get page size (maybe move back to caller) */
/* Get page size (maybe move back to caller).
*
* NOTE: when using special 64K mappings in 4K environment like
* for SPEs, we obtain the page size from the slice, which thus
* must still exist (and thus the VMA not reused) at the time
* of this call
*/
if (huge) {
#ifdef CONFIG_HUGETLB_PAGE
psize = mmu_huge_psize;
#else
BUG();
psize = pte_pagesize_index(pte); /* shutup gcc */
psize = pte_pagesize_index(mm, addr, pte); /* shutup gcc */
#endif
} else
psize = pte_pagesize_index(pte);
psize = pte_pagesize_index(mm, addr, pte);
/* Build full vaddr */
if (!is_kernel_addr(addr)) {

2
arch/powerpc/platforms/86xx/mpc86xx_smp.c
Просмотреть файл

@ -15,8 +15,8 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pci-bridge.h>
#include <asm-powerpc/mpic.h>
#include <asm/mpc86xx.h>

15
arch/powerpc/platforms/cell/Kconfig
Просмотреть файл

@ -35,6 +35,21 @@ config SPU_FS
Units on machines implementing the Broadband Processor
Architecture.
config SPU_FS_64K_LS
bool "Use 64K pages to map SPE local store"
# we depend on PPC_MM_SLICES for now rather than selecting
# it because we depend on hugetlbfs hooks being present. We
# will fix that when the generic code has been improved to
# not require hijacking hugetlbfs hooks.
depends on SPU_FS && PPC_MM_SLICES && !PPC_64K_PAGES
default y
select PPC_HAS_HASH_64K
help
This option causes SPE local stores to be mapped in process
address spaces using 64K pages while the rest of the kernel
uses 4K pages. This can improve performances of applications
using multiple SPEs by lowering the TLB pressure on them.
config SPU_BASE
bool
default n

9
arch/powerpc/platforms/cell/spu_base.c
Просмотреть файл

@ -144,12 +144,11 @@ static int __spu_trap_data_seg(struct spu *spu, unsigned long ea)
switch(REGION_ID(ea)) {
case USER_REGION_ID:
#ifdef CONFIG_HUGETLB_PAGE
if (in_hugepage_area(mm->context, ea))
psize = mmu_huge_psize;
else
#ifdef CONFIG_PPC_MM_SLICES
psize = get_slice_psize(mm, ea);
#else
psize = mm->context.user_psize;
#endif
psize = mm->context.user_psize;
vsid = (get_vsid(mm->context.id, ea) << SLB_VSID_SHIFT) |
SLB_VSID_USER;
break;

2
arch/powerpc/platforms/cell/spufs/Makefile
Просмотреть файл

@ -1,4 +1,4 @@
obj-y += switch.o fault.o
obj-y += switch.o fault.o lscsa_alloc.o
obj-$(CONFIG_SPU_FS) += spufs.o
spufs-y += inode.o file.o context.o syscalls.o coredump.o

4
arch/powerpc/platforms/cell/spufs/context.c
Просмотреть файл

@ -36,10 +36,8 @@ struct spu_context *alloc_spu_context(struct spu_gang *gang)
/* Binding to physical processor deferred
* until spu_activate().
*/
spu_init_csa(&ctx->csa);
if (!ctx->csa.lscsa) {
if (spu_init_csa(&ctx->csa))
goto out_free;
}
spin_lock_init(&ctx->mmio_lock);
spin_lock_init(&ctx->mapping_lock);
kref_init(&ctx->kref);

76
arch/powerpc/platforms/cell/spufs/file.c
Просмотреть файл

@ -118,14 +118,32 @@ spufs_mem_write(struct file *file, const char __user *buffer,
static unsigned long spufs_mem_mmap_nopfn(struct vm_area_struct *vma,
unsigned long address)
{
struct spu_context *ctx = vma->vm_file->private_data;
unsigned long pfn, offset = address - vma->vm_start;
struct spu_context *ctx = vma->vm_file->private_data;
unsigned long pfn, offset, addr0 = address;
#ifdef CONFIG_SPU_FS_64K_LS
struct spu_state *csa = &ctx->csa;
int psize;
offset += vma->vm_pgoff << PAGE_SHIFT;
/* Check what page size we are using */
psize = get_slice_psize(vma->vm_mm, address);
/* Some sanity checking */
BUG_ON(csa->use_big_pages != (psize == MMU_PAGE_64K));
/* Wow, 64K, cool, we need to align the address though */
if (csa->use_big_pages) {
BUG_ON(vma->vm_start & 0xffff);
address &= ~0xfffful;
}
#endif /* CONFIG_SPU_FS_64K_LS */
offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
if (offset >= LS_SIZE)
return NOPFN_SIGBUS;
pr_debug("spufs_mem_mmap_nopfn address=0x%lx -> 0x%lx, offset=0x%lx\n",
addr0, address, offset);
spu_acquire(ctx);
if (ctx->state == SPU_STATE_SAVED) {
@ -149,9 +167,24 @@ static struct vm_operations_struct spufs_mem_mmap_vmops = {
.nopfn = spufs_mem_mmap_nopfn,
};
static int
spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
static int spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
{
#ifdef CONFIG_SPU_FS_64K_LS
struct spu_context *ctx = file->private_data;
struct spu_state *csa = &ctx->csa;
/* Sanity check VMA alignment */
if (csa->use_big_pages) {
pr_debug("spufs_mem_mmap 64K, start=0x%lx, end=0x%lx,"
" pgoff=0x%lx\n", vma->vm_start, vma->vm_end,
vma->vm_pgoff);
if (vma->vm_start & 0xffff)
return -EINVAL;
if (vma->vm_pgoff & 0xf)
return -EINVAL;
}
#endif /* CONFIG_SPU_FS_64K_LS */
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
@ -163,13 +196,34 @@ spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
return 0;
}
#ifdef CONFIG_SPU_FS_64K_LS
unsigned long spufs_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
struct spu_context *ctx = file->private_data;
struct spu_state *csa = &ctx->csa;
/* If not using big pages, fallback to normal MM g_u_a */
if (!csa->use_big_pages)
return current->mm->get_unmapped_area(file, addr, len,
pgoff, flags);
/* Else, try to obtain a 64K pages slice */
return slice_get_unmapped_area(addr, len, flags,
MMU_PAGE_64K, 1, 0);
}
#endif /* CONFIG_SPU_FS_64K_LS */
static const struct file_operations spufs_mem_fops = {
.open = spufs_mem_open,
.release = spufs_mem_release,
.read = spufs_mem_read,
.write = spufs_mem_write,
.llseek = generic_file_llseek,
.mmap = spufs_mem_mmap,
.open = spufs_mem_open,
.read = spufs_mem_read,
.write = spufs_mem_write,
.llseek = generic_file_llseek,
.mmap = spufs_mem_mmap,
#ifdef CONFIG_SPU_FS_64K_LS
.get_unmapped_area = spufs_get_unmapped_area,
#endif
};
static unsigned long spufs_ps_nopfn(struct vm_area_struct *vma,

181
arch/powerpc/platforms/cell/spufs/lscsa_alloc.c Normal file
Просмотреть файл

@ -0,0 +1,181 @@
/*
* SPU local store allocation routines
*
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <asm/spu.h>
#include <asm/spu_csa.h>
#include <asm/mmu.h>
static int spu_alloc_lscsa_std(struct spu_state *csa)
{
struct spu_lscsa *lscsa;
unsigned char *p;
lscsa = vmalloc(sizeof(struct spu_lscsa));
if (!lscsa)
return -ENOMEM;
memset(lscsa, 0, sizeof(struct spu_lscsa));
csa->lscsa = lscsa;
/* Set LS pages reserved to allow for user-space mapping. */
for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
SetPageReserved(vmalloc_to_page(p));
return 0;
}
static void spu_free_lscsa_std(struct spu_state *csa)
{
/* Clear reserved bit before vfree. */
unsigned char *p;
if (csa->lscsa == NULL)
return;
for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
ClearPageReserved(vmalloc_to_page(p));
vfree(csa->lscsa);
}
#ifdef CONFIG_SPU_FS_64K_LS
#define SPU_64K_PAGE_SHIFT 16
#define SPU_64K_PAGE_ORDER (SPU_64K_PAGE_SHIFT - PAGE_SHIFT)
#define SPU_64K_PAGE_COUNT (1ul << SPU_64K_PAGE_ORDER)
int spu_alloc_lscsa(struct spu_state *csa)
{
struct page **pgarray;
unsigned char *p;
int i, j, n_4k;
/* Check availability of 64K pages */
if (mmu_psize_defs[MMU_PAGE_64K].shift == 0)
goto fail;
csa->use_big_pages = 1;
pr_debug("spu_alloc_lscsa(csa=0x%p), trying to allocate 64K pages\n",
csa);
/* First try to allocate our 64K pages. We need 5 of them
* with the current implementation. In the future, we should try
* to separate the lscsa with the actual local store image, thus
* allowing us to require only 4 64K pages per context
*/
for (i = 0; i < SPU_LSCSA_NUM_BIG_PAGES; i++) {
/* XXX This is likely to fail, we should use a special pool
* similiar to what hugetlbfs does.
*/
csa->lscsa_pages[i] = alloc_pages(GFP_KERNEL,
SPU_64K_PAGE_ORDER);
if (csa->lscsa_pages[i] == NULL)
goto fail;
}
pr_debug(" success ! creating vmap...\n");
/* Now we need to create a vmalloc mapping of these for the kernel
* and SPU context switch code to use. Currently, we stick to a
* normal kernel vmalloc mapping, which in our case will be 4K
*/
n_4k = SPU_64K_PAGE_COUNT * SPU_LSCSA_NUM_BIG_PAGES;
pgarray = kmalloc(sizeof(struct page *) * n_4k, GFP_KERNEL);
if (pgarray == NULL)
goto fail;
for (i = 0; i < SPU_LSCSA_NUM_BIG_PAGES; i++)
for (j = 0; j < SPU_64K_PAGE_COUNT; j++)
/* We assume all the struct page's are contiguous
* which should be hopefully the case for an order 4
* allocation..
*/
pgarray[i * SPU_64K_PAGE_COUNT + j] =
csa->lscsa_pages[i] + j;
csa->lscsa = vmap(pgarray, n_4k, VM_USERMAP, PAGE_KERNEL);
kfree(pgarray);
if (csa->lscsa == NULL)
goto fail;
memset(csa->lscsa, 0, sizeof(struct spu_lscsa));
/* Set LS pages reserved to allow for user-space mapping.
*
* XXX isn't that a bit obsolete ? I think we should just
* make sure the page count is high enough. Anyway, won't harm
* for now
*/
for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
SetPageReserved(vmalloc_to_page(p));
pr_debug(" all good !\n");
return 0;
fail:
pr_debug("spufs: failed to allocate lscsa 64K pages, falling back\n");
spu_free_lscsa(csa);
return spu_alloc_lscsa_std(csa);
}
void spu_free_lscsa(struct spu_state *csa)
{
unsigned char *p;
int i;
if (!csa->use_big_pages) {
spu_free_lscsa_std(csa);
return;
}
csa->use_big_pages = 0;
if (csa->lscsa == NULL)
goto free_pages;
for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
ClearPageReserved(vmalloc_to_page(p));
vunmap(csa->lscsa);
csa->lscsa = NULL;
free_pages:
for (i = 0; i < SPU_LSCSA_NUM_BIG_PAGES; i++)
if (csa->lscsa_pages[i])
__free_pages(csa->lscsa_pages[i], SPU_64K_PAGE_ORDER);
}
#else /* CONFIG_SPU_FS_64K_LS */
int spu_alloc_lscsa(struct spu_state *csa)
{
return spu_alloc_lscsa_std(csa);
}
void spu_free_lscsa(struct spu_state *csa)
{
spu_free_lscsa_std(csa);
}
#endif /* !defined(CONFIG_SPU_FS_64K_LS) */

28
arch/powerpc/platforms/cell/spufs/switch.c
Просмотреть файл

@ -2188,40 +2188,30 @@ static void init_priv2(struct spu_state *csa)
* as it is by far the largest of the context save regions,
* and may need to be pinned or otherwise specially aligned.
*/
void spu_init_csa(struct spu_state *csa)
int spu_init_csa(struct spu_state *csa)
{
struct spu_lscsa *lscsa;
unsigned char *p;
int rc;
if (!csa)
return;
return -EINVAL;
memset(csa, 0, sizeof(struct spu_state));
lscsa = vmalloc(sizeof(struct spu_lscsa));
if (!lscsa)
return;
rc = spu_alloc_lscsa(csa);
if (rc)
return rc;
memset(lscsa, 0, sizeof(struct spu_lscsa));
csa->lscsa = lscsa;
spin_lock_init(&csa->register_lock);
/* Set LS pages reserved to allow for user-space mapping. */
for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
SetPageReserved(vmalloc_to_page(p));
init_prob(csa);
init_priv1(csa);
init_priv2(csa);
return 0;
}
EXPORT_SYMBOL_GPL(spu_init_csa);
void spu_fini_csa(struct spu_state *csa)
{
/* Clear reserved bit before vfree. */
unsigned char *p;
for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
ClearPageReserved(vmalloc_to_page(p));
vfree(csa->lscsa);
spu_free_lscsa(csa);
}
EXPORT_SYMBOL_GPL(spu_fini_csa);

4
arch/powerpc/platforms/iseries/Kconfig
Просмотреть файл

@ -7,7 +7,9 @@ menu "iSeries device drivers"
depends on PPC_ISERIES
config VIOCONS
tristate "iSeries Virtual Console Support (Obsolete)"
bool "iSeries Virtual Console Support (Obsolete)"
depends on !HVC_ISERIES
default n
help
This is the old virtual console driver for legacy iSeries.
You should use the iSeries Hypervisor Virtual Console

87
arch/powerpc/platforms/pseries/eeh.c
Просмотреть файл

@ -100,6 +100,9 @@ static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX];
static DEFINE_SPINLOCK(slot_errbuf_lock);
static int eeh_error_buf_size;
#define EEH_PCI_REGS_LOG_LEN 4096
static unsigned char pci_regs_buf[EEH_PCI_REGS_LOG_LEN];
/* System monitoring statistics */
static unsigned long no_device;
static unsigned long no_dn;
@ -115,7 +118,8 @@ static unsigned long slot_resets;
/* --------------------------------------------------------------- */
/* Below lies the EEH event infrastructure */
void eeh_slot_error_detail (struct pci_dn *pdn, int severity)
static void rtas_slot_error_detail(struct pci_dn *pdn, int severity,
char *driver_log, size_t loglen)
{
int config_addr;
unsigned long flags;
@ -133,7 +137,8 @@ void eeh_slot_error_detail (struct pci_dn *pdn, int severity)
rc = rtas_call(ibm_slot_error_detail,
8, 1, NULL, config_addr,
BUID_HI(pdn->phb->buid),
BUID_LO(pdn->phb->buid), NULL, 0,
BUID_LO(pdn->phb->buid),
virt_to_phys(driver_log), loglen,
virt_to_phys(slot_errbuf),
eeh_error_buf_size,
severity);
@ -143,6 +148,84 @@ void eeh_slot_error_detail (struct pci_dn *pdn, int severity)
spin_unlock_irqrestore(&slot_errbuf_lock, flags);
}
/**
* gather_pci_data - copy assorted PCI config space registers to buff
* @pdn: device to report data for
* @buf: point to buffer in which to log
* @len: amount of room in buffer
*
* This routine captures assorted PCI configuration space data,
* and puts them into a buffer for RTAS error logging.
*/
static size_t gather_pci_data(struct pci_dn *pdn, char * buf, size_t len)
{
u32 cfg;
int cap, i;
int n = 0;
n += scnprintf(buf+n, len-n, "%s\n", pdn->node->full_name);
printk(KERN_WARNING "EEH: of node=%s\n", pdn->node->full_name);
rtas_read_config(pdn, PCI_VENDOR_ID, 4, &cfg);
n += scnprintf(buf+n, len-n, "dev/vend:%08x\n", cfg);
printk(KERN_WARNING "EEH: PCI device/vendor: %08x\n", cfg);
rtas_read_config(pdn, PCI_COMMAND, 4, &cfg);
n += scnprintf(buf+n, len-n, "cmd/stat:%x\n", cfg);
printk(KERN_WARNING "EEH: PCI cmd/status register: %08x\n", cfg);
/* Dump out the PCI-X command and status regs */
cap = pci_find_capability(pdn->pcidev, PCI_CAP_ID_PCIX);
if (cap) {
rtas_read_config(pdn, cap, 4, &cfg);
n += scnprintf(buf+n, len-n, "pcix-cmd:%x\n", cfg);
printk(KERN_WARNING "EEH: PCI-X cmd: %08x\n", cfg);
rtas_read_config(pdn, cap+4, 4, &cfg);
n += scnprintf(buf+n, len-n, "pcix-stat:%x\n", cfg);
printk(KERN_WARNING "EEH: PCI-X status: %08x\n", cfg);
}
/* If PCI-E capable, dump PCI-E cap 10, and the AER */
cap = pci_find_capability(pdn->pcidev, PCI_CAP_ID_EXP);
if (cap) {
n += scnprintf(buf+n, len-n, "pci-e cap10:\n");
printk(KERN_WARNING
"EEH: PCI-E capabilities and status follow:\n");
for (i=0; i<=8; i++) {
rtas_read_config(pdn, cap+4*i, 4, &cfg);
n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg);
printk(KERN_WARNING "EEH: PCI-E %02x: %08x\n", i, cfg);
}
cap = pci_find_ext_capability(pdn->pcidev,PCI_EXT_CAP_ID_ERR);
if (cap) {
n += scnprintf(buf+n, len-n, "pci-e AER:\n");
printk(KERN_WARNING
"EEH: PCI-E AER capability register set follows:\n");
for (i=0; i<14; i++) {
rtas_read_config(pdn, cap+4*i, 4, &cfg);
n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg);
printk(KERN_WARNING "EEH: PCI-E AER %02x: %08x\n", i, cfg);
}
}
}
return n;
}
void eeh_slot_error_detail(struct pci_dn *pdn, int severity)
{
size_t loglen = 0;
memset(pci_regs_buf, 0, EEH_PCI_REGS_LOG_LEN);
rtas_pci_enable(pdn, EEH_THAW_MMIO);
loglen = gather_pci_data(pdn, pci_regs_buf, EEH_PCI_REGS_LOG_LEN);
rtas_slot_error_detail(pdn, severity, pci_regs_buf, loglen);
}
/**
* read_slot_reset_state - Read the reset state of a device node's slot
* @dn: device node to read

14
arch/powerpc/platforms/pseries/eeh_driver.c
Просмотреть файл

@ -361,11 +361,12 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event)
goto hard_fail;
}
eeh_slot_error_detail(frozen_pdn, 1 /* Temporary Error */);
printk(KERN_WARNING
"EEH: This PCI device has failed %d times since last reboot: "
"location=%s driver=%s pci addr=%s\n",
frozen_pdn->eeh_freeze_count, location, drv_str, pci_str);
"EEH: This PCI device has failed %d times in the last hour:\n",
frozen_pdn->eeh_freeze_count);
printk(KERN_WARNING
"EEH: location=%s driver=%s pci addr=%s\n",
location, drv_str, pci_str);
/* Walk the various device drivers attached to this slot through
* a reset sequence, giving each an opportunity to do what it needs
@ -375,6 +376,11 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event)
*/
pci_walk_bus(frozen_bus, eeh_report_error, &result);
/* Since rtas may enable MMIO when posting the error log,
* don't post the error log until after all dev drivers
* have been informed. */
eeh_slot_error_detail(frozen_pdn, 1 /* Temporary Error */);
/* If all device drivers were EEH-unaware, then shut
* down all of the device drivers, and hope they
* go down willingly, without panicing the system.

2
arch/powerpc/sysdev/fsl_soc.c
Просмотреть файл

@ -907,7 +907,7 @@ static int __init fs_enet_of_init(void)
struct fs_platform_info fs_enet_data;
const unsigned int *id;
const unsigned int *phy_addr;
void *mac_addr;
const void *mac_addr;
const phandle *ph;
const char *model;

3
drivers/char/Kconfig
Просмотреть файл

@ -631,7 +631,8 @@ config HVC_CONSOLE
config HVC_ISERIES
bool "iSeries Hypervisor Virtual Console support"
depends on PPC_ISERIES && !VIOCONS
depends on PPC_ISERIES
default y
select HVC_DRIVER
help
iSeries machines support a hypervisor virtual console.

11
include/asm-powerpc/mmu-hash64.h
Просмотреть файл

@ -350,10 +350,13 @@ typedef unsigned long mm_context_id_t;
typedef struct {
mm_context_id_t id;
u16 user_psize; /* page size index */
u16 sllp; /* SLB entry page size encoding */
#ifdef CONFIG_HUGETLB_PAGE
u16 low_htlb_areas, high_htlb_areas;
u16 user_psize; /* page size index */
#ifdef CONFIG_PPC_MM_SLICES
u64 low_slices_psize; /* SLB page size encodings */
u64 high_slices_psize; /* 4 bits per slice for now */
#else
u16 sllp; /* SLB page size encoding */
#endif
unsigned long vdso_base;
} mm_context_t;

2
include/asm-powerpc/paca.h
Просмотреть файл

@ -83,8 +83,8 @@ struct paca_struct {
mm_context_t context;
u16 vmalloc_sllp;
u16 slb_cache[SLB_CACHE_ENTRIES];
u16 slb_cache_ptr;
u16 slb_cache[SLB_CACHE_ENTRIES];
/*
* then miscellaneous read-write fields

86
include/asm-powerpc/page_64.h
Просмотреть файл

@ -88,58 +88,56 @@ extern unsigned int HPAGE_SHIFT;
#endif /* __ASSEMBLY__ */
#ifdef CONFIG_HUGETLB_PAGE
#ifdef CONFIG_PPC_MM_SLICES
#define HTLB_AREA_SHIFT 40
#define HTLB_AREA_SIZE (1UL << HTLB_AREA_SHIFT)
#define GET_HTLB_AREA(x) ((x) >> HTLB_AREA_SHIFT)
#define SLICE_LOW_SHIFT 28
#define SLICE_HIGH_SHIFT 40
#define LOW_ESID_MASK(addr, len) \
(((1U << (GET_ESID(min((addr)+(len)-1, 0x100000000UL))+1)) \
- (1U << GET_ESID(min((addr), 0x100000000UL)))) & 0xffff)
#define HTLB_AREA_MASK(addr, len) (((1U << (GET_HTLB_AREA(addr+len-1)+1)) \
- (1U << GET_HTLB_AREA(addr))) & 0xffff)
#define SLICE_LOW_TOP (0x100000000ul)
#define SLICE_NUM_LOW (SLICE_LOW_TOP >> SLICE_LOW_SHIFT)
#define SLICE_NUM_HIGH (PGTABLE_RANGE >> SLICE_HIGH_SHIFT)
#define GET_LOW_SLICE_INDEX(addr) ((addr) >> SLICE_LOW_SHIFT)
#define GET_HIGH_SLICE_INDEX(addr) ((addr) >> SLICE_HIGH_SHIFT)
#ifndef __ASSEMBLY__
struct slice_mask {
u16 low_slices;
u16 high_slices;
};
struct mm_struct;
extern unsigned long slice_get_unmapped_area(unsigned long addr,
unsigned long len,
unsigned long flags,
unsigned int psize,
int topdown,
int use_cache);
extern unsigned int get_slice_psize(struct mm_struct *mm,
unsigned long addr);
extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
#define ARCH_HAS_HUGEPAGE_ONLY_RANGE
extern int is_hugepage_only_range(struct mm_struct *m,
unsigned long addr,
unsigned long len);
#endif /* __ASSEMBLY__ */
#else
#define slice_init()
#endif /* CONFIG_PPC_MM_SLICES */
#ifdef CONFIG_HUGETLB_PAGE
#define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
#define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
#define ARCH_HAS_SETCLEAR_HUGE_PTE
#define touches_hugepage_low_range(mm, addr, len) \
(((addr) < 0x100000000UL) \
&& (LOW_ESID_MASK((addr), (len)) & (mm)->context.low_htlb_areas))
#define touches_hugepage_high_range(mm, addr, len) \
((((addr) + (len)) > 0x100000000UL) \
&& (HTLB_AREA_MASK((addr), (len)) & (mm)->context.high_htlb_areas))
#define __within_hugepage_low_range(addr, len, segmask) \
( (((addr)+(len)) <= 0x100000000UL) \
&& ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask)))
#define within_hugepage_low_range(addr, len) \
__within_hugepage_low_range((addr), (len), \
current->mm->context.low_htlb_areas)
#define __within_hugepage_high_range(addr, len, zonemask) \
( ((addr) >= 0x100000000UL) \
&& ((HTLB_AREA_MASK((addr), (len)) | (zonemask)) == (zonemask)))
#define within_hugepage_high_range(addr, len) \
__within_hugepage_high_range((addr), (len), \
current->mm->context.high_htlb_areas)
#define is_hugepage_only_range(mm, addr, len) \
(touches_hugepage_high_range((mm), (addr), (len)) || \
touches_hugepage_low_range((mm), (addr), (len)))
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#define in_hugepage_area(context, addr) \
(cpu_has_feature(CPU_FTR_16M_PAGE) && \
( ( (addr) >= 0x100000000UL) \
? ((1 << GET_HTLB_AREA(addr)) & (context).high_htlb_areas) \
: ((1 << GET_ESID(addr)) & (context).low_htlb_areas) ) )
#else /* !CONFIG_HUGETLB_PAGE */
#define in_hugepage_area(mm, addr) 0
#endif /* !CONFIG_HUGETLB_PAGE */
#ifdef MODULE

31
include/asm-powerpc/pgalloc-64.h
Просмотреть файл

@ -14,18 +14,11 @@
extern struct kmem_cache *pgtable_cache[];
#ifdef CONFIG_PPC_64K_PAGES
#define PTE_CACHE_NUM 0
#define PMD_CACHE_NUM 1
#define PGD_CACHE_NUM 2
#define HUGEPTE_CACHE_NUM 3
#else
#define PTE_CACHE_NUM 0
#define PMD_CACHE_NUM 1
#define PUD_CACHE_NUM 1
#define PGD_CACHE_NUM 0
#define HUGEPTE_CACHE_NUM 2
#endif
#define PGD_CACHE_NUM 0
#define PUD_CACHE_NUM 1
#define PMD_CACHE_NUM 1
#define HUGEPTE_CACHE_NUM 2
#define PTE_NONCACHE_NUM 3 /* from GFP rather than kmem_cache */
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
@ -91,8 +84,7 @@ static inline void pmd_free(pmd_t *pmd)
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
{
return kmem_cache_alloc(pgtable_cache[PTE_CACHE_NUM],
GFP_KERNEL|__GFP_REPEAT);
return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
}
static inline struct page *pte_alloc_one(struct mm_struct *mm,
@ -103,12 +95,12 @@ static inline struct page *pte_alloc_one(struct mm_struct *mm,
static inline void pte_free_kernel(pte_t *pte)
{
kmem_cache_free(pgtable_cache[PTE_CACHE_NUM], pte);
free_page((unsigned long)pte);
}
static inline void pte_free(struct page *ptepage)
{
pte_free_kernel(page_address(ptepage));
__free_page(ptepage);
}
#define PGF_CACHENUM_MASK 0x3
@ -130,14 +122,17 @@ static inline void pgtable_free(pgtable_free_t pgf)
void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
int cachenum = pgf.val & PGF_CACHENUM_MASK;
kmem_cache_free(pgtable_cache[cachenum], p);
if (cachenum == PTE_NONCACHE_NUM)
free_page((unsigned long)p);
else
kmem_cache_free(pgtable_cache[cachenum], p);
}
extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
#define __pte_free_tlb(tlb, ptepage) \
pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
PTE_CACHE_NUM, PTE_TABLE_SIZE-1))
PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1))
#define __pmd_free_tlb(tlb, pmd) \
pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
PMD_CACHE_NUM, PMD_TABLE_SIZE-1))

6
include/asm-powerpc/pgtable-4k.h
Просмотреть файл

@ -80,7 +80,11 @@
#define pte_iterate_hashed_end() } while(0)
#define pte_pagesize_index(pte) MMU_PAGE_4K
#ifdef CONFIG_PPC_HAS_HASH_64K
#define pte_pagesize_index(mm, addr, pte) get_slice_psize(mm, addr)
#else
#define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K
#endif
/*
* 4-level page tables related bits

7
include/asm-powerpc/pgtable-64k.h
Просмотреть файл

@ -35,6 +35,11 @@
#define _PAGE_HPTE_SUB0 0x08000000 /* combo only: first sub page */
#define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */
#define _PAGE_4K_PFN 0x20000000 /* PFN is for a single 4k page */
/* Note the full page bits must be in the same location as for normal
* 4k pages as the same asssembly will be used to insert 64K pages
* wether the kernel has CONFIG_PPC_64K_PAGES or not
*/
#define _PAGE_F_SECOND 0x00008000 /* full page: hidx bits */
#define _PAGE_F_GIX 0x00007000 /* full page: hidx bits */
@ -88,7 +93,7 @@
#define pte_iterate_hashed_end() } while(0); } } while(0)
#define pte_pagesize_index(pte) \
#define pte_pagesize_index(mm, addr, pte) \
(((pte) & _PAGE_COMBO)? MMU_PAGE_4K: MMU_PAGE_64K)
#define remap_4k_pfn(vma, addr, pfn, prot) \

10
include/asm-powerpc/spu_csa.h
Просмотреть файл

@ -235,6 +235,12 @@ struct spu_priv2_collapsed {
*/
struct spu_state {
struct spu_lscsa *lscsa;
#ifdef CONFIG_SPU_FS_64K_LS
int use_big_pages;
/* One struct page per 64k page */
#define SPU_LSCSA_NUM_BIG_PAGES (sizeof(struct spu_lscsa) / 0x10000)
struct page *lscsa_pages[SPU_LSCSA_NUM_BIG_PAGES];
#endif
struct spu_problem_collapsed prob;
struct spu_priv1_collapsed priv1;
struct spu_priv2_collapsed priv2;
@ -247,12 +253,14 @@ struct spu_state {
spinlock_t register_lock;
};
extern void spu_init_csa(struct spu_state *csa);
extern int spu_init_csa(struct spu_state *csa);
extern void spu_fini_csa(struct spu_state *csa);
extern int spu_save(struct spu_state *prev, struct spu *spu);
extern int spu_restore(struct spu_state *new, struct spu *spu);
extern int spu_switch(struct spu_state *prev, struct spu_state *new,
struct spu *spu);
extern int spu_alloc_lscsa(struct spu_state *csa);
extern void spu_free_lscsa(struct spu_state *csa);
#endif /* !__SPU__ */
#endif /* __KERNEL__ */

11
include/linux/suspend.h
Просмотреть файл

@ -52,7 +52,15 @@ struct hibernation_ops {
#if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND)
/* kernel/power/snapshot.c */
extern void __init register_nosave_region(unsigned long, unsigned long);
extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
static inline void register_nosave_region(unsigned long b, unsigned long e)
{
__register_nosave_region(b, e, 0);
}
static inline void register_nosave_region_late(unsigned long b, unsigned long e)
{
__register_nosave_region(b, e, 1);
}
extern int swsusp_page_is_forbidden(struct page *);
extern void swsusp_set_page_free(struct page *);
extern void swsusp_unset_page_free(struct page *);
@ -62,6 +70,7 @@ extern void hibernation_set_ops(struct hibernation_ops *ops);
extern int hibernate(void);
#else
static inline void register_nosave_region(unsigned long b, unsigned long e) {}
static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
static inline void swsusp_set_page_free(struct page *p) {}
static inline void swsusp_unset_page_free(struct page *p) {}

12
kernel/power/snapshot.c
Просмотреть файл

@ -607,7 +607,8 @@ static LIST_HEAD(nosave_regions);
*/
void __init
register_nosave_region(unsigned long start_pfn, unsigned long end_pfn)
__register_nosave_region(unsigned long start_pfn, unsigned long end_pfn,
int use_kmalloc)
{
struct nosave_region *region;
@ -623,8 +624,13 @@ register_nosave_region(unsigned long start_pfn, unsigned long end_pfn)
goto Report;
}
}
/* This allocation cannot fail */
region = alloc_bootmem_low(sizeof(struct nosave_region));
if (use_kmalloc) {
/* during init, this shouldn't fail */
region = kmalloc(sizeof(struct nosave_region), GFP_KERNEL);
BUG_ON(!region);
} else
/* This allocation cannot fail */
region = alloc_bootmem_low(sizeof(struct nosave_region));
region->start_pfn = start_pfn;
region->end_pfn = end_pfn;
list_add_tail(&region->list, &nosave_regions);