2 * Copyright 2002 Andi Kleen, SuSE Labs.
3 * Thanks to Ben LaHaise for precious feedback.
5 #include <linux/highmem.h>
6 #include <linux/bootmem.h>
7 #include <linux/sched.h>
9 #include <linux/interrupt.h>
10 #include <linux/seq_file.h>
11 #include <linux/debugfs.h>
12 #include <linux/pfn.h>
13 #include <linux/percpu.h>
14 #include <linux/gfp.h>
15 #include <linux/pci.h>
16 #include <linux/vmalloc.h>
19 #include <asm/processor.h>
20 #include <asm/tlbflush.h>
21 #include <asm/sections.h>
22 #include <asm/setup.h>
23 #include <asm/uaccess.h>
24 #include <asm/pgalloc.h>
25 #include <asm/proto.h>
29 * The current flushing context - we pass it instead of 5 arguments:
39 unsigned force_split
: 1;
45 * Serialize cpa() (for !DEBUG_PAGEALLOC which uses large identity mappings)
46 * using cpa_lock. So that we don't allow any other cpu, with stale large tlb
47 * entries change the page attribute in parallel to some other cpu
48 * splitting a large page entry along with changing the attribute.
50 static DEFINE_SPINLOCK(cpa_lock
);
52 #define CPA_FLUSHTLB 1
54 #define CPA_PAGES_ARRAY 4
57 static unsigned long direct_pages_count
[PG_LEVEL_NUM
];
59 void update_page_count(int level
, unsigned long pages
)
61 /* Protect against CPA */
63 direct_pages_count
[level
] += pages
;
64 spin_unlock(&pgd_lock
);
67 static void split_page_count(int level
)
69 if (direct_pages_count
[level
] == 0)
72 direct_pages_count
[level
]--;
73 direct_pages_count
[level
- 1] += PTRS_PER_PTE
;
76 void arch_report_meminfo(struct seq_file
*m
)
78 seq_printf(m
, "DirectMap4k: %8lu kB\n",
79 direct_pages_count
[PG_LEVEL_4K
] << 2);
80 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
81 seq_printf(m
, "DirectMap2M: %8lu kB\n",
82 direct_pages_count
[PG_LEVEL_2M
] << 11);
84 seq_printf(m
, "DirectMap4M: %8lu kB\n",
85 direct_pages_count
[PG_LEVEL_2M
] << 12);
88 seq_printf(m
, "DirectMap1G: %8lu kB\n",
89 direct_pages_count
[PG_LEVEL_1G
] << 20);
92 static inline void split_page_count(int level
) { }
97 static inline unsigned long highmap_start_pfn(void)
99 return __pa_symbol(_text
) >> PAGE_SHIFT
;
102 static inline unsigned long highmap_end_pfn(void)
104 return __pa_symbol(roundup(_brk_end
, PMD_SIZE
)) >> PAGE_SHIFT
;
109 #ifdef CONFIG_DEBUG_PAGEALLOC
110 # define debug_pagealloc 1
112 # define debug_pagealloc 0
116 within(unsigned long addr
, unsigned long start
, unsigned long end
)
118 return addr
>= start
&& addr
< end
;
126 * clflush_cache_range - flush a cache range with clflush
127 * @vaddr: virtual start address
128 * @size: number of bytes to flush
130 * clflushopt is an unordered instruction which needs fencing with mfence or
131 * sfence to avoid ordering issues.
133 void clflush_cache_range(void *vaddr
, unsigned int size
)
135 const unsigned long clflush_size
= boot_cpu_data
.x86_clflush_size
;
136 void *p
= (void *)((unsigned long)vaddr
& ~(clflush_size
- 1));
137 void *vend
= vaddr
+ size
;
144 for (; p
< vend
; p
+= clflush_size
)
149 EXPORT_SYMBOL_GPL(clflush_cache_range
);
151 static void __cpa_flush_all(void *arg
)
153 unsigned long cache
= (unsigned long)arg
;
156 * Flush all to work around Errata in early athlons regarding
157 * large page flushing.
161 if (cache
&& boot_cpu_data
.x86
>= 4)
165 static void cpa_flush_all(unsigned long cache
)
167 BUG_ON(irqs_disabled());
169 on_each_cpu(__cpa_flush_all
, (void *) cache
, 1);
172 static void __cpa_flush_range(void *arg
)
175 * We could optimize that further and do individual per page
176 * tlb invalidates for a low number of pages. Caveat: we must
177 * flush the high aliases on 64bit as well.
182 static void cpa_flush_range(unsigned long start
, int numpages
, int cache
)
184 unsigned int i
, level
;
187 BUG_ON(irqs_disabled());
188 WARN_ON(PAGE_ALIGN(start
) != start
);
190 on_each_cpu(__cpa_flush_range
, NULL
, 1);
196 * We only need to flush on one CPU,
197 * clflush is a MESI-coherent instruction that
198 * will cause all other CPUs to flush the same
201 for (i
= 0, addr
= start
; i
< numpages
; i
++, addr
+= PAGE_SIZE
) {
202 pte_t
*pte
= lookup_address(addr
, &level
);
205 * Only flush present addresses:
207 if (pte
&& (pte_val(*pte
) & _PAGE_PRESENT
))
208 clflush_cache_range((void *) addr
, PAGE_SIZE
);
212 static void cpa_flush_array(unsigned long *start
, int numpages
, int cache
,
213 int in_flags
, struct page
**pages
)
215 unsigned int i
, level
;
216 unsigned long do_wbinvd
= cache
&& numpages
>= 1024; /* 4M threshold */
218 BUG_ON(irqs_disabled());
220 on_each_cpu(__cpa_flush_all
, (void *) do_wbinvd
, 1);
222 if (!cache
|| do_wbinvd
)
226 * We only need to flush on one CPU,
227 * clflush is a MESI-coherent instruction that
228 * will cause all other CPUs to flush the same
231 for (i
= 0; i
< numpages
; i
++) {
235 if (in_flags
& CPA_PAGES_ARRAY
)
236 addr
= (unsigned long)page_address(pages
[i
]);
240 pte
= lookup_address(addr
, &level
);
243 * Only flush present addresses:
245 if (pte
&& (pte_val(*pte
) & _PAGE_PRESENT
))
246 clflush_cache_range((void *)addr
, PAGE_SIZE
);
251 * Certain areas of memory on x86 require very specific protection flags,
252 * for example the BIOS area or kernel text. Callers don't always get this
253 * right (again, ioremap() on BIOS memory is not uncommon) so this function
254 * checks and fixes these known static required protection bits.
256 static inline pgprot_t
static_protections(pgprot_t prot
, unsigned long address
,
259 pgprot_t forbidden
= __pgprot(0);
262 * The BIOS area between 640k and 1Mb needs to be executable for
263 * PCI BIOS based config access (CONFIG_PCI_GOBIOS) support.
265 #ifdef CONFIG_PCI_BIOS
266 if (pcibios_enabled
&& within(pfn
, BIOS_BEGIN
>> PAGE_SHIFT
, BIOS_END
>> PAGE_SHIFT
))
267 pgprot_val(forbidden
) |= _PAGE_NX
;
271 * The kernel text needs to be executable for obvious reasons
272 * Does not cover __inittext since that is gone later on. On
273 * 64bit we do not enforce !NX on the low mapping
275 if (within(address
, (unsigned long)_text
, (unsigned long)_etext
))
276 pgprot_val(forbidden
) |= _PAGE_NX
;
279 * The .rodata section needs to be read-only. Using the pfn
280 * catches all aliases.
282 if (within(pfn
, __pa_symbol(__start_rodata
) >> PAGE_SHIFT
,
283 __pa_symbol(__end_rodata
) >> PAGE_SHIFT
))
284 pgprot_val(forbidden
) |= _PAGE_RW
;
286 #if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
288 * Once the kernel maps the text as RO (kernel_set_to_readonly is set),
289 * kernel text mappings for the large page aligned text, rodata sections
290 * will be always read-only. For the kernel identity mappings covering
291 * the holes caused by this alignment can be anything that user asks.
293 * This will preserve the large page mappings for kernel text/data
296 if (kernel_set_to_readonly
&&
297 within(address
, (unsigned long)_text
,
298 (unsigned long)__end_rodata_hpage_align
)) {
302 * Don't enforce the !RW mapping for the kernel text mapping,
303 * if the current mapping is already using small page mapping.
304 * No need to work hard to preserve large page mappings in this
307 * This also fixes the Linux Xen paravirt guest boot failure
308 * (because of unexpected read-only mappings for kernel identity
309 * mappings). In this paravirt guest case, the kernel text
310 * mapping and the kernel identity mapping share the same
311 * page-table pages. Thus we can't really use different
312 * protections for the kernel text and identity mappings. Also,
313 * these shared mappings are made of small page mappings.
314 * Thus this don't enforce !RW mapping for small page kernel
315 * text mapping logic will help Linux Xen parvirt guest boot
318 if (lookup_address(address
, &level
) && (level
!= PG_LEVEL_4K
))
319 pgprot_val(forbidden
) |= _PAGE_RW
;
323 prot
= __pgprot(pgprot_val(prot
) & ~pgprot_val(forbidden
));
329 * Lookup the page table entry for a virtual address in a specific pgd.
330 * Return a pointer to the entry and the level of the mapping.
332 pte_t
*lookup_address_in_pgd(pgd_t
*pgd
, unsigned long address
,
338 *level
= PG_LEVEL_NONE
;
343 pud
= pud_offset(pgd
, address
);
347 *level
= PG_LEVEL_1G
;
348 if (pud_large(*pud
) || !pud_present(*pud
))
351 pmd
= pmd_offset(pud
, address
);
355 *level
= PG_LEVEL_2M
;
356 if (pmd_large(*pmd
) || !pmd_present(*pmd
))
359 *level
= PG_LEVEL_4K
;
361 return pte_offset_kernel(pmd
, address
);
365 * Lookup the page table entry for a virtual address. Return a pointer
366 * to the entry and the level of the mapping.
368 * Note: We return pud and pmd either when the entry is marked large
369 * or when the present bit is not set. Otherwise we would return a
370 * pointer to a nonexisting mapping.
372 pte_t
*lookup_address(unsigned long address
, unsigned int *level
)
374 return lookup_address_in_pgd(pgd_offset_k(address
), address
, level
);
376 EXPORT_SYMBOL_GPL(lookup_address
);
378 static pte_t
*_lookup_address_cpa(struct cpa_data
*cpa
, unsigned long address
,
382 return lookup_address_in_pgd(cpa
->pgd
+ pgd_index(address
),
385 return lookup_address(address
, level
);
389 * Lookup the PMD entry for a virtual address. Return a pointer to the entry
390 * or NULL if not present.
392 pmd_t
*lookup_pmd_address(unsigned long address
)
397 pgd
= pgd_offset_k(address
);
401 pud
= pud_offset(pgd
, address
);
402 if (pud_none(*pud
) || pud_large(*pud
) || !pud_present(*pud
))
405 return pmd_offset(pud
, address
);
409 * This is necessary because __pa() does not work on some
410 * kinds of memory, like vmalloc() or the alloc_remap()
411 * areas on 32-bit NUMA systems. The percpu areas can
412 * end up in this kind of memory, for instance.
414 * This could be optimized, but it is only intended to be
415 * used at inititalization time, and keeping it
416 * unoptimized should increase the testing coverage for
417 * the more obscure platforms.
419 phys_addr_t
slow_virt_to_phys(void *__virt_addr
)
421 unsigned long virt_addr
= (unsigned long)__virt_addr
;
422 unsigned long phys_addr
, offset
;
426 pte
= lookup_address(virt_addr
, &level
);
431 phys_addr
= pud_pfn(*(pud_t
*)pte
) << PAGE_SHIFT
;
432 offset
= virt_addr
& ~PUD_PAGE_MASK
;
435 phys_addr
= pmd_pfn(*(pmd_t
*)pte
) << PAGE_SHIFT
;
436 offset
= virt_addr
& ~PMD_PAGE_MASK
;
439 phys_addr
= pte_pfn(*pte
) << PAGE_SHIFT
;
440 offset
= virt_addr
& ~PAGE_MASK
;
443 return (phys_addr_t
)(phys_addr
| offset
);
445 EXPORT_SYMBOL_GPL(slow_virt_to_phys
);
448 * Set the new pmd in all the pgds we know about:
450 static void __set_pmd_pte(pte_t
*kpte
, unsigned long address
, pte_t pte
)
453 set_pte_atomic(kpte
, pte
);
455 if (!SHARED_KERNEL_PMD
) {
458 list_for_each_entry(page
, &pgd_list
, lru
) {
463 pgd
= (pgd_t
*)page_address(page
) + pgd_index(address
);
464 pud
= pud_offset(pgd
, address
);
465 pmd
= pmd_offset(pud
, address
);
466 set_pte_atomic((pte_t
*)pmd
, pte
);
473 try_preserve_large_page(pte_t
*kpte
, unsigned long address
,
474 struct cpa_data
*cpa
)
476 unsigned long nextpage_addr
, numpages
, pmask
, psize
, addr
, pfn
, old_pfn
;
477 pte_t new_pte
, old_pte
, *tmp
;
478 pgprot_t old_prot
, new_prot
, req_prot
;
482 if (cpa
->force_split
)
485 spin_lock(&pgd_lock
);
487 * Check for races, another CPU might have split this page
490 tmp
= _lookup_address_cpa(cpa
, address
, &level
);
496 old_prot
= pmd_pgprot(*(pmd_t
*)kpte
);
497 old_pfn
= pmd_pfn(*(pmd_t
*)kpte
);
500 old_prot
= pud_pgprot(*(pud_t
*)kpte
);
501 old_pfn
= pud_pfn(*(pud_t
*)kpte
);
508 psize
= page_level_size(level
);
509 pmask
= page_level_mask(level
);
512 * Calculate the number of pages, which fit into this large
513 * page starting at address:
515 nextpage_addr
= (address
+ psize
) & pmask
;
516 numpages
= (nextpage_addr
- address
) >> PAGE_SHIFT
;
517 if (numpages
< cpa
->numpages
)
518 cpa
->numpages
= numpages
;
521 * We are safe now. Check whether the new pgprot is the same:
522 * Convert protection attributes to 4k-format, as cpa->mask* are set
526 req_prot
= pgprot_large_2_4k(old_prot
);
528 pgprot_val(req_prot
) &= ~pgprot_val(cpa
->mask_clr
);
529 pgprot_val(req_prot
) |= pgprot_val(cpa
->mask_set
);
532 * req_prot is in format of 4k pages. It must be converted to large
533 * page format: the caching mode includes the PAT bit located at
534 * different bit positions in the two formats.
536 req_prot
= pgprot_4k_2_large(req_prot
);
539 * Set the PSE and GLOBAL flags only if the PRESENT flag is
540 * set otherwise pmd_present/pmd_huge will return true even on
541 * a non present pmd. The canon_pgprot will clear _PAGE_GLOBAL
542 * for the ancient hardware that doesn't support it.
544 if (pgprot_val(req_prot
) & _PAGE_PRESENT
)
545 pgprot_val(req_prot
) |= _PAGE_PSE
| _PAGE_GLOBAL
;
547 pgprot_val(req_prot
) &= ~(_PAGE_PSE
| _PAGE_GLOBAL
);
549 req_prot
= canon_pgprot(req_prot
);
552 * old_pfn points to the large page base pfn. So we need
553 * to add the offset of the virtual address:
555 pfn
= old_pfn
+ ((address
& (psize
- 1)) >> PAGE_SHIFT
);
558 new_prot
= static_protections(req_prot
, address
, pfn
);
561 * We need to check the full range, whether
562 * static_protection() requires a different pgprot for one of
563 * the pages in the range we try to preserve:
565 addr
= address
& pmask
;
567 for (i
= 0; i
< (psize
>> PAGE_SHIFT
); i
++, addr
+= PAGE_SIZE
, pfn
++) {
568 pgprot_t chk_prot
= static_protections(req_prot
, addr
, pfn
);
570 if (pgprot_val(chk_prot
) != pgprot_val(new_prot
))
575 * If there are no changes, return. maxpages has been updated
578 if (pgprot_val(new_prot
) == pgprot_val(old_prot
)) {
584 * We need to change the attributes. Check, whether we can
585 * change the large page in one go. We request a split, when
586 * the address is not aligned and the number of pages is
587 * smaller than the number of pages in the large page. Note
588 * that we limited the number of possible pages already to
589 * the number of pages in the large page.
591 if (address
== (address
& pmask
) && cpa
->numpages
== (psize
>> PAGE_SHIFT
)) {
593 * The address is aligned and the number of pages
594 * covers the full page.
596 new_pte
= pfn_pte(old_pfn
, new_prot
);
597 __set_pmd_pte(kpte
, address
, new_pte
);
598 cpa
->flags
|= CPA_FLUSHTLB
;
603 spin_unlock(&pgd_lock
);
609 __split_large_page(struct cpa_data
*cpa
, pte_t
*kpte
, unsigned long address
,
612 pte_t
*pbase
= (pte_t
*)page_address(base
);
613 unsigned long ref_pfn
, pfn
, pfninc
= 1;
614 unsigned int i
, level
;
618 spin_lock(&pgd_lock
);
620 * Check for races, another CPU might have split this page
623 tmp
= _lookup_address_cpa(cpa
, address
, &level
);
625 spin_unlock(&pgd_lock
);
629 paravirt_alloc_pte(&init_mm
, page_to_pfn(base
));
633 ref_prot
= pmd_pgprot(*(pmd_t
*)kpte
);
634 /* clear PSE and promote PAT bit to correct position */
635 ref_prot
= pgprot_large_2_4k(ref_prot
);
636 ref_pfn
= pmd_pfn(*(pmd_t
*)kpte
);
640 ref_prot
= pud_pgprot(*(pud_t
*)kpte
);
641 ref_pfn
= pud_pfn(*(pud_t
*)kpte
);
642 pfninc
= PMD_PAGE_SIZE
>> PAGE_SHIFT
;
645 * Clear the PSE flags if the PRESENT flag is not set
646 * otherwise pmd_present/pmd_huge will return true
647 * even on a non present pmd.
649 if (!(pgprot_val(ref_prot
) & _PAGE_PRESENT
))
650 pgprot_val(ref_prot
) &= ~_PAGE_PSE
;
654 spin_unlock(&pgd_lock
);
659 * Set the GLOBAL flags only if the PRESENT flag is set
660 * otherwise pmd/pte_present will return true even on a non
661 * present pmd/pte. The canon_pgprot will clear _PAGE_GLOBAL
662 * for the ancient hardware that doesn't support it.
664 if (pgprot_val(ref_prot
) & _PAGE_PRESENT
)
665 pgprot_val(ref_prot
) |= _PAGE_GLOBAL
;
667 pgprot_val(ref_prot
) &= ~_PAGE_GLOBAL
;
670 * Get the target pfn from the original entry:
673 for (i
= 0; i
< PTRS_PER_PTE
; i
++, pfn
+= pfninc
)
674 set_pte(&pbase
[i
], pfn_pte(pfn
, canon_pgprot(ref_prot
)));
676 if (virt_addr_valid(address
)) {
677 unsigned long pfn
= PFN_DOWN(__pa(address
));
679 if (pfn_range_is_mapped(pfn
, pfn
+ 1))
680 split_page_count(level
);
684 * Install the new, split up pagetable.
686 * We use the standard kernel pagetable protections for the new
687 * pagetable protections, the actual ptes set above control the
688 * primary protection behavior:
690 __set_pmd_pte(kpte
, address
, mk_pte(base
, __pgprot(_KERNPG_TABLE
)));
693 * Intel Atom errata AAH41 workaround.
695 * The real fix should be in hw or in a microcode update, but
696 * we also probabilistically try to reduce the window of having
697 * a large TLB mixed with 4K TLBs while instruction fetches are
701 spin_unlock(&pgd_lock
);
706 static int split_large_page(struct cpa_data
*cpa
, pte_t
*kpte
,
707 unsigned long address
)
711 if (!debug_pagealloc
)
712 spin_unlock(&cpa_lock
);
713 base
= alloc_pages(GFP_KERNEL
| __GFP_NOTRACK
, 0);
714 if (!debug_pagealloc
)
715 spin_lock(&cpa_lock
);
719 if (__split_large_page(cpa
, kpte
, address
, base
))
725 static bool try_to_free_pte_page(pte_t
*pte
)
729 for (i
= 0; i
< PTRS_PER_PTE
; i
++)
730 if (!pte_none(pte
[i
]))
733 free_page((unsigned long)pte
);
737 static bool try_to_free_pmd_page(pmd_t
*pmd
)
741 for (i
= 0; i
< PTRS_PER_PMD
; i
++)
742 if (!pmd_none(pmd
[i
]))
745 free_page((unsigned long)pmd
);
749 static bool try_to_free_pud_page(pud_t
*pud
)
753 for (i
= 0; i
< PTRS_PER_PUD
; i
++)
754 if (!pud_none(pud
[i
]))
757 free_page((unsigned long)pud
);
761 static bool unmap_pte_range(pmd_t
*pmd
, unsigned long start
, unsigned long end
)
763 pte_t
*pte
= pte_offset_kernel(pmd
, start
);
765 while (start
< end
) {
766 set_pte(pte
, __pte(0));
772 if (try_to_free_pte_page((pte_t
*)pmd_page_vaddr(*pmd
))) {
779 static void __unmap_pmd_range(pud_t
*pud
, pmd_t
*pmd
,
780 unsigned long start
, unsigned long end
)
782 if (unmap_pte_range(pmd
, start
, end
))
783 if (try_to_free_pmd_page((pmd_t
*)pud_page_vaddr(*pud
)))
787 static void unmap_pmd_range(pud_t
*pud
, unsigned long start
, unsigned long end
)
789 pmd_t
*pmd
= pmd_offset(pud
, start
);
792 * Not on a 2MB page boundary?
794 if (start
& (PMD_SIZE
- 1)) {
795 unsigned long next_page
= (start
+ PMD_SIZE
) & PMD_MASK
;
796 unsigned long pre_end
= min_t(unsigned long, end
, next_page
);
798 __unmap_pmd_range(pud
, pmd
, start
, pre_end
);
805 * Try to unmap in 2M chunks.
807 while (end
- start
>= PMD_SIZE
) {
811 __unmap_pmd_range(pud
, pmd
, start
, start
+ PMD_SIZE
);
821 return __unmap_pmd_range(pud
, pmd
, start
, end
);
824 * Try again to free the PMD page if haven't succeeded above.
827 if (try_to_free_pmd_page((pmd_t
*)pud_page_vaddr(*pud
)))
831 static void unmap_pud_range(pgd_t
*pgd
, unsigned long start
, unsigned long end
)
833 pud_t
*pud
= pud_offset(pgd
, start
);
836 * Not on a GB page boundary?
838 if (start
& (PUD_SIZE
- 1)) {
839 unsigned long next_page
= (start
+ PUD_SIZE
) & PUD_MASK
;
840 unsigned long pre_end
= min_t(unsigned long, end
, next_page
);
842 unmap_pmd_range(pud
, start
, pre_end
);
849 * Try to unmap in 1G chunks?
851 while (end
- start
>= PUD_SIZE
) {
856 unmap_pmd_range(pud
, start
, start
+ PUD_SIZE
);
866 unmap_pmd_range(pud
, start
, end
);
869 * No need to try to free the PUD page because we'll free it in
870 * populate_pgd's error path
874 static void unmap_pgd_range(pgd_t
*root
, unsigned long addr
, unsigned long end
)
876 pgd_t
*pgd_entry
= root
+ pgd_index(addr
);
878 unmap_pud_range(pgd_entry
, addr
, end
);
880 if (try_to_free_pud_page((pud_t
*)pgd_page_vaddr(*pgd_entry
)))
881 pgd_clear(pgd_entry
);
884 static int alloc_pte_page(pmd_t
*pmd
)
886 pte_t
*pte
= (pte_t
*)get_zeroed_page(GFP_KERNEL
| __GFP_NOTRACK
);
890 set_pmd(pmd
, __pmd(__pa(pte
) | _KERNPG_TABLE
));
894 static int alloc_pmd_page(pud_t
*pud
)
896 pmd_t
*pmd
= (pmd_t
*)get_zeroed_page(GFP_KERNEL
| __GFP_NOTRACK
);
900 set_pud(pud
, __pud(__pa(pmd
) | _KERNPG_TABLE
));
904 static void populate_pte(struct cpa_data
*cpa
,
905 unsigned long start
, unsigned long end
,
906 unsigned num_pages
, pmd_t
*pmd
, pgprot_t pgprot
)
910 pte
= pte_offset_kernel(pmd
, start
);
912 while (num_pages
-- && start
< end
) {
914 /* deal with the NX bit */
915 if (!(pgprot_val(pgprot
) & _PAGE_NX
))
916 cpa
->pfn
&= ~_PAGE_NX
;
918 set_pte(pte
, pfn_pte(cpa
->pfn
>> PAGE_SHIFT
, pgprot
));
921 cpa
->pfn
+= PAGE_SIZE
;
926 static int populate_pmd(struct cpa_data
*cpa
,
927 unsigned long start
, unsigned long end
,
928 unsigned num_pages
, pud_t
*pud
, pgprot_t pgprot
)
930 unsigned int cur_pages
= 0;
935 * Not on a 2M boundary?
937 if (start
& (PMD_SIZE
- 1)) {
938 unsigned long pre_end
= start
+ (num_pages
<< PAGE_SHIFT
);
939 unsigned long next_page
= (start
+ PMD_SIZE
) & PMD_MASK
;
941 pre_end
= min_t(unsigned long, pre_end
, next_page
);
942 cur_pages
= (pre_end
- start
) >> PAGE_SHIFT
;
943 cur_pages
= min_t(unsigned int, num_pages
, cur_pages
);
948 pmd
= pmd_offset(pud
, start
);
950 if (alloc_pte_page(pmd
))
953 populate_pte(cpa
, start
, pre_end
, cur_pages
, pmd
, pgprot
);
959 * We mapped them all?
961 if (num_pages
== cur_pages
)
964 pmd_pgprot
= pgprot_4k_2_large(pgprot
);
966 while (end
- start
>= PMD_SIZE
) {
969 * We cannot use a 1G page so allocate a PMD page if needed.
972 if (alloc_pmd_page(pud
))
975 pmd
= pmd_offset(pud
, start
);
977 set_pmd(pmd
, __pmd(cpa
->pfn
| _PAGE_PSE
|
978 massage_pgprot(pmd_pgprot
)));
981 cpa
->pfn
+= PMD_SIZE
;
982 cur_pages
+= PMD_SIZE
>> PAGE_SHIFT
;
986 * Map trailing 4K pages.
989 pmd
= pmd_offset(pud
, start
);
991 if (alloc_pte_page(pmd
))
994 populate_pte(cpa
, start
, end
, num_pages
- cur_pages
,
1000 static int populate_pud(struct cpa_data
*cpa
, unsigned long start
, pgd_t
*pgd
,
1006 pgprot_t pud_pgprot
;
1008 end
= start
+ (cpa
->numpages
<< PAGE_SHIFT
);
1011 * Not on a Gb page boundary? => map everything up to it with
1014 if (start
& (PUD_SIZE
- 1)) {
1015 unsigned long pre_end
;
1016 unsigned long next_page
= (start
+ PUD_SIZE
) & PUD_MASK
;
1018 pre_end
= min_t(unsigned long, end
, next_page
);
1019 cur_pages
= (pre_end
- start
) >> PAGE_SHIFT
;
1020 cur_pages
= min_t(int, (int)cpa
->numpages
, cur_pages
);
1022 pud
= pud_offset(pgd
, start
);
1028 if (alloc_pmd_page(pud
))
1031 cur_pages
= populate_pmd(cpa
, start
, pre_end
, cur_pages
,
1039 /* We mapped them all? */
1040 if (cpa
->numpages
== cur_pages
)
1043 pud
= pud_offset(pgd
, start
);
1044 pud_pgprot
= pgprot_4k_2_large(pgprot
);
1047 * Map everything starting from the Gb boundary, possibly with 1G pages
1049 while (end
- start
>= PUD_SIZE
) {
1050 set_pud(pud
, __pud(cpa
->pfn
| _PAGE_PSE
|
1051 massage_pgprot(pud_pgprot
)));
1054 cpa
->pfn
+= PUD_SIZE
;
1055 cur_pages
+= PUD_SIZE
>> PAGE_SHIFT
;
1059 /* Map trailing leftover */
1063 pud
= pud_offset(pgd
, start
);
1065 if (alloc_pmd_page(pud
))
1068 tmp
= populate_pmd(cpa
, start
, end
, cpa
->numpages
- cur_pages
,
1079 * Restrictions for kernel page table do not necessarily apply when mapping in
1082 static int populate_pgd(struct cpa_data
*cpa
, unsigned long addr
)
1084 pgprot_t pgprot
= __pgprot(_KERNPG_TABLE
);
1085 pud_t
*pud
= NULL
; /* shut up gcc */
1089 pgd_entry
= cpa
->pgd
+ pgd_index(addr
);
1092 * Allocate a PUD page and hand it down for mapping.
1094 if (pgd_none(*pgd_entry
)) {
1095 pud
= (pud_t
*)get_zeroed_page(GFP_KERNEL
| __GFP_NOTRACK
);
1099 set_pgd(pgd_entry
, __pgd(__pa(pud
) | _KERNPG_TABLE
));
1102 pgprot_val(pgprot
) &= ~pgprot_val(cpa
->mask_clr
);
1103 pgprot_val(pgprot
) |= pgprot_val(cpa
->mask_set
);
1105 ret
= populate_pud(cpa
, addr
, pgd_entry
, pgprot
);
1107 unmap_pgd_range(cpa
->pgd
, addr
,
1108 addr
+ (cpa
->numpages
<< PAGE_SHIFT
));
1112 cpa
->numpages
= ret
;
1116 static int __cpa_process_fault(struct cpa_data
*cpa
, unsigned long vaddr
,
1120 return populate_pgd(cpa
, vaddr
);
1123 * Ignore all non primary paths.
1129 * Ignore the NULL PTE for kernel identity mapping, as it is expected
1131 * Also set numpages to '1' indicating that we processed cpa req for
1132 * one virtual address page and its pfn. TBD: numpages can be set based
1133 * on the initial value and the level returned by lookup_address().
1135 if (within(vaddr
, PAGE_OFFSET
,
1136 PAGE_OFFSET
+ (max_pfn_mapped
<< PAGE_SHIFT
))) {
1138 cpa
->pfn
= __pa(vaddr
) >> PAGE_SHIFT
;
1141 WARN(1, KERN_WARNING
"CPA: called for zero pte. "
1142 "vaddr = %lx cpa->vaddr = %lx\n", vaddr
,
1149 static int __change_page_attr(struct cpa_data
*cpa
, int primary
)
1151 unsigned long address
;
1154 pte_t
*kpte
, old_pte
;
1156 if (cpa
->flags
& CPA_PAGES_ARRAY
) {
1157 struct page
*page
= cpa
->pages
[cpa
->curpage
];
1158 if (unlikely(PageHighMem(page
)))
1160 address
= (unsigned long)page_address(page
);
1161 } else if (cpa
->flags
& CPA_ARRAY
)
1162 address
= cpa
->vaddr
[cpa
->curpage
];
1164 address
= *cpa
->vaddr
;
1166 kpte
= _lookup_address_cpa(cpa
, address
, &level
);
1168 return __cpa_process_fault(cpa
, address
, primary
);
1171 if (!pte_val(old_pte
))
1172 return __cpa_process_fault(cpa
, address
, primary
);
1174 if (level
== PG_LEVEL_4K
) {
1176 pgprot_t new_prot
= pte_pgprot(old_pte
);
1177 unsigned long pfn
= pte_pfn(old_pte
);
1179 pgprot_val(new_prot
) &= ~pgprot_val(cpa
->mask_clr
);
1180 pgprot_val(new_prot
) |= pgprot_val(cpa
->mask_set
);
1182 new_prot
= static_protections(new_prot
, address
, pfn
);
1185 * Set the GLOBAL flags only if the PRESENT flag is
1186 * set otherwise pte_present will return true even on
1187 * a non present pte. The canon_pgprot will clear
1188 * _PAGE_GLOBAL for the ancient hardware that doesn't
1191 if (pgprot_val(new_prot
) & _PAGE_PRESENT
)
1192 pgprot_val(new_prot
) |= _PAGE_GLOBAL
;
1194 pgprot_val(new_prot
) &= ~_PAGE_GLOBAL
;
1197 * We need to keep the pfn from the existing PTE,
1198 * after all we're only going to change it's attributes
1199 * not the memory it points to
1201 new_pte
= pfn_pte(pfn
, canon_pgprot(new_prot
));
1204 * Do we really change anything ?
1206 if (pte_val(old_pte
) != pte_val(new_pte
)) {
1207 set_pte_atomic(kpte
, new_pte
);
1208 cpa
->flags
|= CPA_FLUSHTLB
;
1215 * Check, whether we can keep the large page intact
1216 * and just change the pte:
1218 do_split
= try_preserve_large_page(kpte
, address
, cpa
);
1220 * When the range fits into the existing large page,
1221 * return. cp->numpages and cpa->tlbflush have been updated in
1228 * We have to split the large page:
1230 err
= split_large_page(cpa
, kpte
, address
);
1233 * Do a global flush tlb after splitting the large page
1234 * and before we do the actual change page attribute in the PTE.
1236 * With out this, we violate the TLB application note, that says
1237 * "The TLBs may contain both ordinary and large-page
1238 * translations for a 4-KByte range of linear addresses. This
1239 * may occur if software modifies the paging structures so that
1240 * the page size used for the address range changes. If the two
1241 * translations differ with respect to page frame or attributes
1242 * (e.g., permissions), processor behavior is undefined and may
1243 * be implementation-specific."
1245 * We do this global tlb flush inside the cpa_lock, so that we
1246 * don't allow any other cpu, with stale tlb entries change the
1247 * page attribute in parallel, that also falls into the
1248 * just split large page entry.
1257 static int __change_page_attr_set_clr(struct cpa_data
*cpa
, int checkalias
);
1259 static int cpa_process_alias(struct cpa_data
*cpa
)
1261 struct cpa_data alias_cpa
;
1262 unsigned long laddr
= (unsigned long)__va(cpa
->pfn
<< PAGE_SHIFT
);
1263 unsigned long vaddr
;
1266 if (!pfn_range_is_mapped(cpa
->pfn
, cpa
->pfn
+ 1))
1270 * No need to redo, when the primary call touched the direct
1273 if (cpa
->flags
& CPA_PAGES_ARRAY
) {
1274 struct page
*page
= cpa
->pages
[cpa
->curpage
];
1275 if (unlikely(PageHighMem(page
)))
1277 vaddr
= (unsigned long)page_address(page
);
1278 } else if (cpa
->flags
& CPA_ARRAY
)
1279 vaddr
= cpa
->vaddr
[cpa
->curpage
];
1281 vaddr
= *cpa
->vaddr
;
1283 if (!(within(vaddr
, PAGE_OFFSET
,
1284 PAGE_OFFSET
+ (max_pfn_mapped
<< PAGE_SHIFT
)))) {
1287 alias_cpa
.vaddr
= &laddr
;
1288 alias_cpa
.flags
&= ~(CPA_PAGES_ARRAY
| CPA_ARRAY
);
1290 ret
= __change_page_attr_set_clr(&alias_cpa
, 0);
1295 #ifdef CONFIG_X86_64
1297 * If the primary call didn't touch the high mapping already
1298 * and the physical address is inside the kernel map, we need
1299 * to touch the high mapped kernel as well:
1301 if (!within(vaddr
, (unsigned long)_text
, _brk_end
) &&
1302 within(cpa
->pfn
, highmap_start_pfn(), highmap_end_pfn())) {
1303 unsigned long temp_cpa_vaddr
= (cpa
->pfn
<< PAGE_SHIFT
) +
1304 __START_KERNEL_map
- phys_base
;
1306 alias_cpa
.vaddr
= &temp_cpa_vaddr
;
1307 alias_cpa
.flags
&= ~(CPA_PAGES_ARRAY
| CPA_ARRAY
);
1310 * The high mapping range is imprecise, so ignore the
1313 __change_page_attr_set_clr(&alias_cpa
, 0);
1320 static int __change_page_attr_set_clr(struct cpa_data
*cpa
, int checkalias
)
1322 int ret
, numpages
= cpa
->numpages
;
1326 * Store the remaining nr of pages for the large page
1327 * preservation check.
1329 cpa
->numpages
= numpages
;
1330 /* for array changes, we can't use large page */
1331 if (cpa
->flags
& (CPA_ARRAY
| CPA_PAGES_ARRAY
))
1334 if (!debug_pagealloc
)
1335 spin_lock(&cpa_lock
);
1336 ret
= __change_page_attr(cpa
, checkalias
);
1337 if (!debug_pagealloc
)
1338 spin_unlock(&cpa_lock
);
1343 ret
= cpa_process_alias(cpa
);
1349 * Adjust the number of pages with the result of the
1350 * CPA operation. Either a large page has been
1351 * preserved or a single page update happened.
1353 BUG_ON(cpa
->numpages
> numpages
);
1354 numpages
-= cpa
->numpages
;
1355 if (cpa
->flags
& (CPA_PAGES_ARRAY
| CPA_ARRAY
))
1358 *cpa
->vaddr
+= cpa
->numpages
* PAGE_SIZE
;
1364 static int change_page_attr_set_clr(unsigned long *addr
, int numpages
,
1365 pgprot_t mask_set
, pgprot_t mask_clr
,
1366 int force_split
, int in_flag
,
1367 struct page
**pages
)
1369 struct cpa_data cpa
;
1370 int ret
, cache
, checkalias
;
1371 unsigned long baddr
= 0;
1373 memset(&cpa
, 0, sizeof(cpa
));
1376 * Check, if we are requested to change a not supported
1379 mask_set
= canon_pgprot(mask_set
);
1380 mask_clr
= canon_pgprot(mask_clr
);
1381 if (!pgprot_val(mask_set
) && !pgprot_val(mask_clr
) && !force_split
)
1384 /* Ensure we are PAGE_SIZE aligned */
1385 if (in_flag
& CPA_ARRAY
) {
1387 for (i
= 0; i
< numpages
; i
++) {
1388 if (addr
[i
] & ~PAGE_MASK
) {
1389 addr
[i
] &= PAGE_MASK
;
1393 } else if (!(in_flag
& CPA_PAGES_ARRAY
)) {
1395 * in_flag of CPA_PAGES_ARRAY implies it is aligned.
1396 * No need to cehck in that case
1398 if (*addr
& ~PAGE_MASK
) {
1401 * People should not be passing in unaligned addresses:
1406 * Save address for cache flush. *addr is modified in the call
1407 * to __change_page_attr_set_clr() below.
1412 /* Must avoid aliasing mappings in the highmem code */
1413 kmap_flush_unused();
1419 cpa
.numpages
= numpages
;
1420 cpa
.mask_set
= mask_set
;
1421 cpa
.mask_clr
= mask_clr
;
1424 cpa
.force_split
= force_split
;
1426 if (in_flag
& (CPA_ARRAY
| CPA_PAGES_ARRAY
))
1427 cpa
.flags
|= in_flag
;
1429 /* No alias checking for _NX bit modifications */
1430 checkalias
= (pgprot_val(mask_set
) | pgprot_val(mask_clr
)) != _PAGE_NX
;
1432 ret
= __change_page_attr_set_clr(&cpa
, checkalias
);
1435 * Check whether we really changed something:
1437 if (!(cpa
.flags
& CPA_FLUSHTLB
))
1441 * No need to flush, when we did not set any of the caching
1444 cache
= !!pgprot2cachemode(mask_set
);
1447 * On success we use CLFLUSH, when the CPU supports it to
1448 * avoid the WBINVD. If the CPU does not support it and in the
1449 * error case we fall back to cpa_flush_all (which uses
1452 if (!ret
&& cpu_has_clflush
) {
1453 if (cpa
.flags
& (CPA_PAGES_ARRAY
| CPA_ARRAY
)) {
1454 cpa_flush_array(addr
, numpages
, cache
,
1457 cpa_flush_range(baddr
, numpages
, cache
);
1459 cpa_flush_all(cache
);
1465 static inline int change_page_attr_set(unsigned long *addr
, int numpages
,
1466 pgprot_t mask
, int array
)
1468 return change_page_attr_set_clr(addr
, numpages
, mask
, __pgprot(0), 0,
1469 (array
? CPA_ARRAY
: 0), NULL
);
1472 static inline int change_page_attr_clear(unsigned long *addr
, int numpages
,
1473 pgprot_t mask
, int array
)
1475 return change_page_attr_set_clr(addr
, numpages
, __pgprot(0), mask
, 0,
1476 (array
? CPA_ARRAY
: 0), NULL
);
1479 static inline int cpa_set_pages_array(struct page
**pages
, int numpages
,
1482 return change_page_attr_set_clr(NULL
, numpages
, mask
, __pgprot(0), 0,
1483 CPA_PAGES_ARRAY
, pages
);
1486 static inline int cpa_clear_pages_array(struct page
**pages
, int numpages
,
1489 return change_page_attr_set_clr(NULL
, numpages
, __pgprot(0), mask
, 0,
1490 CPA_PAGES_ARRAY
, pages
);
1493 int _set_memory_uc(unsigned long addr
, int numpages
)
1496 * for now UC MINUS. see comments in ioremap_nocache()
1497 * If you really need strong UC use ioremap_uc(), but note
1498 * that you cannot override IO areas with set_memory_*() as
1499 * these helpers cannot work with IO memory.
1501 return change_page_attr_set(&addr
, numpages
,
1502 cachemode2pgprot(_PAGE_CACHE_MODE_UC_MINUS
),
1506 int set_memory_uc(unsigned long addr
, int numpages
)
1511 * for now UC MINUS. see comments in ioremap_nocache()
1513 ret
= reserve_memtype(__pa(addr
), __pa(addr
) + numpages
* PAGE_SIZE
,
1514 _PAGE_CACHE_MODE_UC_MINUS
, NULL
);
1518 ret
= _set_memory_uc(addr
, numpages
);
1525 free_memtype(__pa(addr
), __pa(addr
) + numpages
* PAGE_SIZE
);
1529 EXPORT_SYMBOL(set_memory_uc
);
1531 static int _set_memory_array(unsigned long *addr
, int addrinarray
,
1532 enum page_cache_mode new_type
)
1534 enum page_cache_mode set_type
;
1538 for (i
= 0; i
< addrinarray
; i
++) {
1539 ret
= reserve_memtype(__pa(addr
[i
]), __pa(addr
[i
]) + PAGE_SIZE
,
1545 /* If WC, set to UC- first and then WC */
1546 set_type
= (new_type
== _PAGE_CACHE_MODE_WC
) ?
1547 _PAGE_CACHE_MODE_UC_MINUS
: new_type
;
1549 ret
= change_page_attr_set(addr
, addrinarray
,
1550 cachemode2pgprot(set_type
), 1);
1552 if (!ret
&& new_type
== _PAGE_CACHE_MODE_WC
)
1553 ret
= change_page_attr_set_clr(addr
, addrinarray
,
1555 _PAGE_CACHE_MODE_WC
),
1556 __pgprot(_PAGE_CACHE_MASK
),
1557 0, CPA_ARRAY
, NULL
);
1564 for (j
= 0; j
< i
; j
++)
1565 free_memtype(__pa(addr
[j
]), __pa(addr
[j
]) + PAGE_SIZE
);
1570 int set_memory_array_uc(unsigned long *addr
, int addrinarray
)
1572 return _set_memory_array(addr
, addrinarray
, _PAGE_CACHE_MODE_UC_MINUS
);
1574 EXPORT_SYMBOL(set_memory_array_uc
);
1576 int set_memory_array_wc(unsigned long *addr
, int addrinarray
)
1578 return _set_memory_array(addr
, addrinarray
, _PAGE_CACHE_MODE_WC
);
1580 EXPORT_SYMBOL(set_memory_array_wc
);
1582 int set_memory_array_wt(unsigned long *addr
, int addrinarray
)
1584 return _set_memory_array(addr
, addrinarray
, _PAGE_CACHE_MODE_WT
);
1586 EXPORT_SYMBOL_GPL(set_memory_array_wt
);
1588 int _set_memory_wc(unsigned long addr
, int numpages
)
1591 unsigned long addr_copy
= addr
;
1593 ret
= change_page_attr_set(&addr
, numpages
,
1594 cachemode2pgprot(_PAGE_CACHE_MODE_UC_MINUS
),
1597 ret
= change_page_attr_set_clr(&addr_copy
, numpages
,
1599 _PAGE_CACHE_MODE_WC
),
1600 __pgprot(_PAGE_CACHE_MASK
),
1606 int set_memory_wc(unsigned long addr
, int numpages
)
1610 ret
= reserve_memtype(__pa(addr
), __pa(addr
) + numpages
* PAGE_SIZE
,
1611 _PAGE_CACHE_MODE_WC
, NULL
);
1615 ret
= _set_memory_wc(addr
, numpages
);
1617 free_memtype(__pa(addr
), __pa(addr
) + numpages
* PAGE_SIZE
);
1621 EXPORT_SYMBOL(set_memory_wc
);
1623 int _set_memory_wt(unsigned long addr
, int numpages
)
1625 return change_page_attr_set(&addr
, numpages
,
1626 cachemode2pgprot(_PAGE_CACHE_MODE_WT
), 0);
1629 int set_memory_wt(unsigned long addr
, int numpages
)
1633 ret
= reserve_memtype(__pa(addr
), __pa(addr
) + numpages
* PAGE_SIZE
,
1634 _PAGE_CACHE_MODE_WT
, NULL
);
1638 ret
= _set_memory_wt(addr
, numpages
);
1640 free_memtype(__pa(addr
), __pa(addr
) + numpages
* PAGE_SIZE
);
1644 EXPORT_SYMBOL_GPL(set_memory_wt
);
1646 int _set_memory_wb(unsigned long addr
, int numpages
)
1648 /* WB cache mode is hard wired to all cache attribute bits being 0 */
1649 return change_page_attr_clear(&addr
, numpages
,
1650 __pgprot(_PAGE_CACHE_MASK
), 0);
1653 int set_memory_wb(unsigned long addr
, int numpages
)
1657 ret
= _set_memory_wb(addr
, numpages
);
1661 free_memtype(__pa(addr
), __pa(addr
) + numpages
* PAGE_SIZE
);
1664 EXPORT_SYMBOL(set_memory_wb
);
1666 int set_memory_array_wb(unsigned long *addr
, int addrinarray
)
1671 /* WB cache mode is hard wired to all cache attribute bits being 0 */
1672 ret
= change_page_attr_clear(addr
, addrinarray
,
1673 __pgprot(_PAGE_CACHE_MASK
), 1);
1677 for (i
= 0; i
< addrinarray
; i
++)
1678 free_memtype(__pa(addr
[i
]), __pa(addr
[i
]) + PAGE_SIZE
);
1682 EXPORT_SYMBOL(set_memory_array_wb
);
1684 int set_memory_x(unsigned long addr
, int numpages
)
1686 if (!(__supported_pte_mask
& _PAGE_NX
))
1689 return change_page_attr_clear(&addr
, numpages
, __pgprot(_PAGE_NX
), 0);
1691 EXPORT_SYMBOL(set_memory_x
);
1693 int set_memory_nx(unsigned long addr
, int numpages
)
1695 if (!(__supported_pte_mask
& _PAGE_NX
))
1698 return change_page_attr_set(&addr
, numpages
, __pgprot(_PAGE_NX
), 0);
1700 EXPORT_SYMBOL(set_memory_nx
);
1702 int set_memory_ro(unsigned long addr
, int numpages
)
1704 return change_page_attr_clear(&addr
, numpages
, __pgprot(_PAGE_RW
), 0);
1707 int set_memory_rw(unsigned long addr
, int numpages
)
1709 return change_page_attr_set(&addr
, numpages
, __pgprot(_PAGE_RW
), 0);
1712 int set_memory_np(unsigned long addr
, int numpages
)
1714 return change_page_attr_clear(&addr
, numpages
, __pgprot(_PAGE_PRESENT
), 0);
1717 int set_memory_4k(unsigned long addr
, int numpages
)
1719 return change_page_attr_set_clr(&addr
, numpages
, __pgprot(0),
1720 __pgprot(0), 1, 0, NULL
);
1723 int set_pages_uc(struct page
*page
, int numpages
)
1725 unsigned long addr
= (unsigned long)page_address(page
);
1727 return set_memory_uc(addr
, numpages
);
1729 EXPORT_SYMBOL(set_pages_uc
);
1731 static int _set_pages_array(struct page
**pages
, int addrinarray
,
1732 enum page_cache_mode new_type
)
1734 unsigned long start
;
1736 enum page_cache_mode set_type
;
1741 for (i
= 0; i
< addrinarray
; i
++) {
1742 if (PageHighMem(pages
[i
]))
1744 start
= page_to_pfn(pages
[i
]) << PAGE_SHIFT
;
1745 end
= start
+ PAGE_SIZE
;
1746 if (reserve_memtype(start
, end
, new_type
, NULL
))
1750 /* If WC, set to UC- first and then WC */
1751 set_type
= (new_type
== _PAGE_CACHE_MODE_WC
) ?
1752 _PAGE_CACHE_MODE_UC_MINUS
: new_type
;
1754 ret
= cpa_set_pages_array(pages
, addrinarray
,
1755 cachemode2pgprot(set_type
));
1756 if (!ret
&& new_type
== _PAGE_CACHE_MODE_WC
)
1757 ret
= change_page_attr_set_clr(NULL
, addrinarray
,
1759 _PAGE_CACHE_MODE_WC
),
1760 __pgprot(_PAGE_CACHE_MASK
),
1761 0, CPA_PAGES_ARRAY
, pages
);
1764 return 0; /* Success */
1767 for (i
= 0; i
< free_idx
; i
++) {
1768 if (PageHighMem(pages
[i
]))
1770 start
= page_to_pfn(pages
[i
]) << PAGE_SHIFT
;
1771 end
= start
+ PAGE_SIZE
;
1772 free_memtype(start
, end
);
1777 int set_pages_array_uc(struct page
**pages
, int addrinarray
)
1779 return _set_pages_array(pages
, addrinarray
, _PAGE_CACHE_MODE_UC_MINUS
);
1781 EXPORT_SYMBOL(set_pages_array_uc
);
1783 int set_pages_array_wc(struct page
**pages
, int addrinarray
)
1785 return _set_pages_array(pages
, addrinarray
, _PAGE_CACHE_MODE_WC
);
1787 EXPORT_SYMBOL(set_pages_array_wc
);
1789 int set_pages_array_wt(struct page
**pages
, int addrinarray
)
1791 return _set_pages_array(pages
, addrinarray
, _PAGE_CACHE_MODE_WT
);
1793 EXPORT_SYMBOL_GPL(set_pages_array_wt
);
1795 int set_pages_wb(struct page
*page
, int numpages
)
1797 unsigned long addr
= (unsigned long)page_address(page
);
1799 return set_memory_wb(addr
, numpages
);
1801 EXPORT_SYMBOL(set_pages_wb
);
1803 int set_pages_array_wb(struct page
**pages
, int addrinarray
)
1806 unsigned long start
;
1810 /* WB cache mode is hard wired to all cache attribute bits being 0 */
1811 retval
= cpa_clear_pages_array(pages
, addrinarray
,
1812 __pgprot(_PAGE_CACHE_MASK
));
1816 for (i
= 0; i
< addrinarray
; i
++) {
1817 if (PageHighMem(pages
[i
]))
1819 start
= page_to_pfn(pages
[i
]) << PAGE_SHIFT
;
1820 end
= start
+ PAGE_SIZE
;
1821 free_memtype(start
, end
);
1826 EXPORT_SYMBOL(set_pages_array_wb
);
1828 int set_pages_x(struct page
*page
, int numpages
)
1830 unsigned long addr
= (unsigned long)page_address(page
);
1832 return set_memory_x(addr
, numpages
);
1834 EXPORT_SYMBOL(set_pages_x
);
1836 int set_pages_nx(struct page
*page
, int numpages
)
1838 unsigned long addr
= (unsigned long)page_address(page
);
1840 return set_memory_nx(addr
, numpages
);
1842 EXPORT_SYMBOL(set_pages_nx
);
1844 int set_pages_ro(struct page
*page
, int numpages
)
1846 unsigned long addr
= (unsigned long)page_address(page
);
1848 return set_memory_ro(addr
, numpages
);
1851 int set_pages_rw(struct page
*page
, int numpages
)
1853 unsigned long addr
= (unsigned long)page_address(page
);
1855 return set_memory_rw(addr
, numpages
);
1858 #ifdef CONFIG_DEBUG_PAGEALLOC
1860 static int __set_pages_p(struct page
*page
, int numpages
)
1862 unsigned long tempaddr
= (unsigned long) page_address(page
);
1863 struct cpa_data cpa
= { .vaddr
= &tempaddr
,
1865 .numpages
= numpages
,
1866 .mask_set
= __pgprot(_PAGE_PRESENT
| _PAGE_RW
),
1867 .mask_clr
= __pgprot(0),
1871 * No alias checking needed for setting present flag. otherwise,
1872 * we may need to break large pages for 64-bit kernel text
1873 * mappings (this adds to complexity if we want to do this from
1874 * atomic context especially). Let's keep it simple!
1876 return __change_page_attr_set_clr(&cpa
, 0);
1879 static int __set_pages_np(struct page
*page
, int numpages
)
1881 unsigned long tempaddr
= (unsigned long) page_address(page
);
1882 struct cpa_data cpa
= { .vaddr
= &tempaddr
,
1884 .numpages
= numpages
,
1885 .mask_set
= __pgprot(0),
1886 .mask_clr
= __pgprot(_PAGE_PRESENT
| _PAGE_RW
),
1890 * No alias checking needed for setting not present flag. otherwise,
1891 * we may need to break large pages for 64-bit kernel text
1892 * mappings (this adds to complexity if we want to do this from
1893 * atomic context especially). Let's keep it simple!
1895 return __change_page_attr_set_clr(&cpa
, 0);
1898 void __kernel_map_pages(struct page
*page
, int numpages
, int enable
)
1900 if (PageHighMem(page
))
1903 debug_check_no_locks_freed(page_address(page
),
1904 numpages
* PAGE_SIZE
);
1908 * The return value is ignored as the calls cannot fail.
1909 * Large pages for identity mappings are not used at boot time
1910 * and hence no memory allocations during large page split.
1913 __set_pages_p(page
, numpages
);
1915 __set_pages_np(page
, numpages
);
1918 * We should perform an IPI and flush all tlbs,
1919 * but that can deadlock->flush only current cpu:
1923 arch_flush_lazy_mmu_mode();
1926 #ifdef CONFIG_HIBERNATION
1928 bool kernel_page_present(struct page
*page
)
1933 if (PageHighMem(page
))
1936 pte
= lookup_address((unsigned long)page_address(page
), &level
);
1937 return (pte_val(*pte
) & _PAGE_PRESENT
);
1940 #endif /* CONFIG_HIBERNATION */
1942 #endif /* CONFIG_DEBUG_PAGEALLOC */
1944 int kernel_map_pages_in_pgd(pgd_t
*pgd
, u64 pfn
, unsigned long address
,
1945 unsigned numpages
, unsigned long page_flags
)
1947 int retval
= -EINVAL
;
1949 struct cpa_data cpa
= {
1953 .numpages
= numpages
,
1954 .mask_set
= __pgprot(0),
1955 .mask_clr
= __pgprot(0),
1959 if (!(__supported_pte_mask
& _PAGE_NX
))
1962 if (!(page_flags
& _PAGE_NX
))
1963 cpa
.mask_clr
= __pgprot(_PAGE_NX
);
1965 cpa
.mask_set
= __pgprot(_PAGE_PRESENT
| page_flags
);
1967 retval
= __change_page_attr_set_clr(&cpa
, 0);
1974 void kernel_unmap_pages_in_pgd(pgd_t
*root
, unsigned long address
,
1977 unmap_pgd_range(root
, address
, address
+ (numpages
<< PAGE_SHIFT
));
1981 * The testcases use internal knowledge of the implementation that shouldn't
1982 * be exposed to the rest of the kernel. Include these directly here.
1984 #ifdef CONFIG_CPA_DEBUG
1985 #include "pageattr-test.c"