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Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
-rw-r--r--arch/powerpc/mm/hash_utils_64.c99
1 files changed, 72 insertions, 27 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 88ac0eeaadd..6ecc38bd5b2 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -33,6 +33,7 @@
#include <linux/init.h>
#include <linux/signal.h>
#include <linux/memblock.h>
+#include <linux/context_tracking.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
@@ -806,7 +807,7 @@ void __init early_init_mmu(void)
}
#ifdef CONFIG_SMP
-void __cpuinit early_init_mmu_secondary(void)
+void early_init_mmu_secondary(void)
{
/* Initialize hash table for that CPU */
if (!firmware_has_feature(FW_FEATURE_LPAR))
@@ -954,6 +955,7 @@ void hash_failure_debug(unsigned long ea, unsigned long access,
*/
int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
{
+ enum ctx_state prev_state = exception_enter();
pgd_t *pgdir;
unsigned long vsid;
struct mm_struct *mm;
@@ -973,7 +975,8 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
mm = current->mm;
if (! mm) {
DBG_LOW(" user region with no mm !\n");
- return 1;
+ rc = 1;
+ goto bail;
}
psize = get_slice_psize(mm, ea);
ssize = user_segment_size(ea);
@@ -992,19 +995,23 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
/* Not a valid range
* Send the problem up to do_page_fault
*/
- return 1;
+ rc = 1;
+ goto bail;
}
DBG_LOW(" mm=%p, mm->pgdir=%p, vsid=%016lx\n", mm, mm->pgd, vsid);
/* Bad address. */
if (!vsid) {
DBG_LOW("Bad address!\n");
- return 1;
+ rc = 1;
+ goto bail;
}
/* Get pgdir */
pgdir = mm->pgd;
- if (pgdir == NULL)
- return 1;
+ if (pgdir == NULL) {
+ rc = 1;
+ goto bail;
+ }
/* Check CPU locality */
tmp = cpumask_of(smp_processor_id());
@@ -1027,7 +1034,8 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
ptep = find_linux_pte_or_hugepte(pgdir, ea, &hugeshift);
if (ptep == NULL || !pte_present(*ptep)) {
DBG_LOW(" no PTE !\n");
- return 1;
+ rc = 1;
+ goto bail;
}
/* Add _PAGE_PRESENT to the required access perm */
@@ -1038,14 +1046,30 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
*/
if (access & ~pte_val(*ptep)) {
DBG_LOW(" no access !\n");
- return 1;
+ rc = 1;
+ goto bail;
}
+ if (hugeshift) {
+ if (pmd_trans_huge(*(pmd_t *)ptep))
+ rc = __hash_page_thp(ea, access, vsid, (pmd_t *)ptep,
+ trap, local, ssize, psize);
#ifdef CONFIG_HUGETLB_PAGE
- if (hugeshift)
- return __hash_page_huge(ea, access, vsid, ptep, trap, local,
- ssize, hugeshift, psize);
-#endif /* CONFIG_HUGETLB_PAGE */
+ else
+ rc = __hash_page_huge(ea, access, vsid, ptep, trap,
+ local, ssize, hugeshift, psize);
+#else
+ else {
+ /*
+ * if we have hugeshift, and is not transhuge with
+ * hugetlb disabled, something is really wrong.
+ */
+ rc = 1;
+ WARN_ON(1);
+ }
+#endif
+ goto bail;
+ }
#ifndef CONFIG_PPC_64K_PAGES
DBG_LOW(" i-pte: %016lx\n", pte_val(*ptep));
@@ -1124,6 +1148,9 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
pte_val(*(ptep + PTRS_PER_PTE)));
#endif
DBG_LOW(" -> rc=%d\n", rc);
+
+bail:
+ exception_exit(prev_state);
return rc;
}
EXPORT_SYMBOL_GPL(hash_page);
@@ -1131,6 +1158,7 @@ EXPORT_SYMBOL_GPL(hash_page);
void hash_preload(struct mm_struct *mm, unsigned long ea,
unsigned long access, unsigned long trap)
{
+ int hugepage_shift;
unsigned long vsid;
pgd_t *pgdir;
pte_t *ptep;
@@ -1152,10 +1180,27 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
pgdir = mm->pgd;
if (pgdir == NULL)
return;
- ptep = find_linux_pte(pgdir, ea);
- if (!ptep)
+
+ /* Get VSID */
+ ssize = user_segment_size(ea);
+ vsid = get_vsid(mm->context.id, ea, ssize);
+ if (!vsid)
return;
+ /*
+ * Hash doesn't like irqs. Walking linux page table with irq disabled
+ * saves us from holding multiple locks.
+ */
+ local_irq_save(flags);
+ /*
+ * THP pages use update_mmu_cache_pmd. We don't do
+ * hash preload there. Hence can ignore THP here
+ */
+ ptep = find_linux_pte_or_hugepte(pgdir, ea, &hugepage_shift);
+ if (!ptep)
+ goto out_exit;
+
+ WARN_ON(hugepage_shift);
#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
@@ -1164,18 +1209,9 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
* page size demotion here
*/
if (pte_val(*ptep) & (_PAGE_4K_PFN | _PAGE_NO_CACHE))
- return;
+ goto out_exit;
#endif /* CONFIG_PPC_64K_PAGES */
- /* Get VSID */
- ssize = user_segment_size(ea);
- vsid = get_vsid(mm->context.id, ea, ssize);
- if (!vsid)
- return;
-
- /* Hash doesn't like irqs */
- local_irq_save(flags);
-
/* Is that local to this CPU ? */
if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
local = 1;
@@ -1197,7 +1233,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
mm->context.user_psize,
mm->context.user_psize,
pte_val(*ptep));
-
+out_exit:
local_irq_restore(flags);
}
@@ -1218,7 +1254,11 @@ void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize,
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
slot += hidx & _PTEIDX_GROUP_IX;
DBG_LOW(" sub %ld: hash=%lx, hidx=%lx\n", index, slot, hidx);
- ppc_md.hpte_invalidate(slot, vpn, psize, ssize, local);
+ /*
+ * We use same base page size and actual psize, because we don't
+ * use these functions for hugepage
+ */
+ ppc_md.hpte_invalidate(slot, vpn, psize, psize, ssize, local);
} pte_iterate_hashed_end();
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
@@ -1259,6 +1299,8 @@ void flush_hash_range(unsigned long number, int local)
*/
void low_hash_fault(struct pt_regs *regs, unsigned long address, int rc)
{
+ enum ctx_state prev_state = exception_enter();
+
if (user_mode(regs)) {
#ifdef CONFIG_PPC_SUBPAGE_PROT
if (rc == -2)
@@ -1268,6 +1310,8 @@ void low_hash_fault(struct pt_regs *regs, unsigned long address, int rc)
_exception(SIGBUS, regs, BUS_ADRERR, address);
} else
bad_page_fault(regs, address, SIGBUS);
+
+ exception_exit(prev_state);
}
long hpte_insert_repeating(unsigned long hash, unsigned long vpn,
@@ -1347,7 +1391,8 @@ static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long lmi)
hash = ~hash;
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
slot += hidx & _PTEIDX_GROUP_IX;
- ppc_md.hpte_invalidate(slot, vpn, mmu_linear_psize, mmu_kernel_ssize, 0);
+ ppc_md.hpte_invalidate(slot, vpn, mmu_linear_psize, mmu_linear_psize,
+ mmu_kernel_ssize, 0);
}
void kernel_map_pages(struct page *page, int numpages, int enable)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-06-02 05:47:56 +0000