summaryrefslogtreecommitdiff
path: root/arch/powerpc/mm/hash_utils_64.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
-rw-r--r--arch/powerpc/mm/hash_utils_64.c114
1 files changed, 98 insertions, 16 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index d5339a3b9945..e56a307bc676 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -989,7 +989,9 @@ static void check_paca_psize(unsigned long ea, struct mm_struct *mm,
* -1 - critical hash insertion error
* -2 - access not permitted by subpage protection mechanism
*/
-int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, unsigned long trap)
+int hash_page_mm(struct mm_struct *mm, unsigned long ea,
+ unsigned long access, unsigned long trap,
+ unsigned long flags)
{
enum ctx_state prev_state = exception_enter();
pgd_t *pgdir;
@@ -997,7 +999,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, u
pte_t *ptep;
unsigned hugeshift;
const struct cpumask *tmp;
- int rc, user_region = 0, local = 0;
+ int rc, user_region = 0;
int psize, ssize;
DBG_LOW("hash_page(ea=%016lx, access=%lx, trap=%lx\n",
@@ -1049,7 +1051,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, u
/* Check CPU locality */
tmp = cpumask_of(smp_processor_id());
if (user_region && cpumask_equal(mm_cpumask(mm), tmp))
- local = 1;
+ flags |= HPTE_LOCAL_UPDATE;
#ifndef CONFIG_PPC_64K_PAGES
/* If we use 4K pages and our psize is not 4K, then we might
@@ -1086,11 +1088,11 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, u
if (hugeshift) {
if (pmd_trans_huge(*(pmd_t *)ptep))
rc = __hash_page_thp(ea, access, vsid, (pmd_t *)ptep,
- trap, local, ssize, psize);
+ trap, flags, ssize, psize);
#ifdef CONFIG_HUGETLB_PAGE
else
rc = __hash_page_huge(ea, access, vsid, ptep, trap,
- local, ssize, hugeshift, psize);
+ flags, ssize, hugeshift, psize);
#else
else {
/*
@@ -1149,7 +1151,8 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, u
#ifdef CONFIG_PPC_HAS_HASH_64K
if (psize == MMU_PAGE_64K)
- rc = __hash_page_64K(ea, access, vsid, ptep, trap, local, ssize);
+ rc = __hash_page_64K(ea, access, vsid, ptep, trap,
+ flags, ssize);
else
#endif /* CONFIG_PPC_HAS_HASH_64K */
{
@@ -1158,7 +1161,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, unsigned long access, u
rc = -2;
else
rc = __hash_page_4K(ea, access, vsid, ptep, trap,
- local, ssize, spp);
+ flags, ssize, spp);
}
/* Dump some info in case of hash insertion failure, they should
@@ -1181,14 +1184,19 @@ bail:
}
EXPORT_SYMBOL_GPL(hash_page_mm);
-int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
+int hash_page(unsigned long ea, unsigned long access, unsigned long trap,
+ unsigned long dsisr)
{
+ unsigned long flags = 0;
struct mm_struct *mm = current->mm;
if (REGION_ID(ea) == VMALLOC_REGION_ID)
mm = &init_mm;
- return hash_page_mm(mm, ea, access, trap);
+ if (dsisr & DSISR_NOHPTE)
+ flags |= HPTE_NOHPTE_UPDATE;
+
+ return hash_page_mm(mm, ea, access, trap, flags);
}
EXPORT_SYMBOL_GPL(hash_page);
@@ -1200,7 +1208,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
pgd_t *pgdir;
pte_t *ptep;
unsigned long flags;
- int rc, ssize, local = 0;
+ int rc, ssize, update_flags = 0;
BUG_ON(REGION_ID(ea) != USER_REGION_ID);
@@ -1251,16 +1259,17 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
/* Is that local to this CPU ? */
if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
- local = 1;
+ update_flags |= HPTE_LOCAL_UPDATE;
/* Hash it in */
#ifdef CONFIG_PPC_HAS_HASH_64K
if (mm->context.user_psize == MMU_PAGE_64K)
- rc = __hash_page_64K(ea, access, vsid, ptep, trap, local, ssize);
+ rc = __hash_page_64K(ea, access, vsid, ptep, trap,
+ update_flags, ssize);
else
#endif /* CONFIG_PPC_HAS_HASH_64K */
- rc = __hash_page_4K(ea, access, vsid, ptep, trap, local, ssize,
- subpage_protection(mm, ea));
+ rc = __hash_page_4K(ea, access, vsid, ptep, trap, update_flags,
+ ssize, subpage_protection(mm, ea));
/* Dump some info in case of hash insertion failure, they should
* never happen so it is really useful to know if/when they do
@@ -1278,9 +1287,10 @@ out_exit:
* do not forget to update the assembly call site !
*/
void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize,
- int local)
+ unsigned long flags)
{
unsigned long hash, index, shift, hidx, slot;
+ int local = flags & HPTE_LOCAL_UPDATE;
DBG_LOW("flush_hash_page(vpn=%016lx)\n", vpn);
pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
@@ -1315,6 +1325,78 @@ void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize,
#endif
}
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+void flush_hash_hugepage(unsigned long vsid, unsigned long addr,
+ pmd_t *pmdp, unsigned int psize, int ssize,
+ unsigned long flags)
+{
+ int i, max_hpte_count, valid;
+ unsigned long s_addr;
+ unsigned char *hpte_slot_array;
+ unsigned long hidx, shift, vpn, hash, slot;
+ int local = flags & HPTE_LOCAL_UPDATE;
+
+ s_addr = addr & HPAGE_PMD_MASK;
+ hpte_slot_array = get_hpte_slot_array(pmdp);
+ /*
+ * IF we try to do a HUGE PTE update after a withdraw is done.
+ * we will find the below NULL. This happens when we do
+ * split_huge_page_pmd
+ */
+ if (!hpte_slot_array)
+ return;
+
+ if (ppc_md.hugepage_invalidate) {
+ ppc_md.hugepage_invalidate(vsid, s_addr, hpte_slot_array,
+ psize, ssize, local);
+ goto tm_abort;
+ }
+ /*
+ * No bluk hpte removal support, invalidate each entry
+ */
+ shift = mmu_psize_defs[psize].shift;
+ max_hpte_count = HPAGE_PMD_SIZE >> shift;
+ for (i = 0; i < max_hpte_count; i++) {
+ /*
+ * 8 bits per each hpte entries
+ * 000| [ secondary group (one bit) | hidx (3 bits) | valid bit]
+ */
+ valid = hpte_valid(hpte_slot_array, i);
+ if (!valid)
+ continue;
+ hidx = hpte_hash_index(hpte_slot_array, i);
+
+ /* get the vpn */
+ addr = s_addr + (i * (1ul << shift));
+ vpn = hpt_vpn(addr, vsid, ssize);
+ hash = hpt_hash(vpn, shift, ssize);
+ if (hidx & _PTEIDX_SECONDARY)
+ hash = ~hash;
+
+ slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
+ slot += hidx & _PTEIDX_GROUP_IX;
+ ppc_md.hpte_invalidate(slot, vpn, psize,
+ MMU_PAGE_16M, ssize, local);
+ }
+tm_abort:
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+ /* Transactions are not aborted by tlbiel, only tlbie.
+ * Without, syncing a page back to a block device w/ PIO could pick up
+ * transactional data (bad!) so we force an abort here. Before the
+ * sync the page will be made read-only, which will flush_hash_page.
+ * BIG ISSUE here: if the kernel uses a page from userspace without
+ * unmapping it first, it may see the speculated version.
+ */
+ if (local && cpu_has_feature(CPU_FTR_TM) &&
+ current->thread.regs &&
+ MSR_TM_ACTIVE(current->thread.regs->msr)) {
+ tm_enable();
+ tm_abort(TM_CAUSE_TLBI);
+ }
+#endif
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
void flush_hash_range(unsigned long number, int local)
{
if (ppc_md.flush_hash_range)
@@ -1322,7 +1404,7 @@ void flush_hash_range(unsigned long number, int local)
else {
int i;
struct ppc64_tlb_batch *batch =
- &__get_cpu_var(ppc64_tlb_batch);
+ this_cpu_ptr(&ppc64_tlb_batch);
for (i = 0; i < number; i++)
flush_hash_page(batch->vpn[i], batch->pte[i],
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-09 20:57:19 +0000