@@ -135,7 +135,6 @@ config PPC
select ARCH_HAS_DMA_MAP_DIRECT if PPC_PSERIES
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
- select ARCH_HAS_HUGEPD if HUGETLB_PAGE
select ARCH_HAS_KCOV
select ARCH_HAS_MEMBARRIER_CALLBACKS
select ARCH_HAS_MEMBARRIER_SYNC_CORE
@@ -4,42 +4,12 @@
#define PAGE_SHIFT_8M 23
-static inline pte_t *hugepd_page(hugepd_t hpd)
-{
- BUG_ON(!hugepd_ok(hpd));
-
- return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
-}
-
-static inline unsigned int hugepd_shift(hugepd_t hpd)
-{
- return PAGE_SHIFT_8M;
-}
-
-static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
- unsigned int pdshift)
-{
- unsigned long idx = (addr & (SZ_4M - 1)) >> PAGE_SHIFT;
-
- return hugepd_page(hpd) + idx;
-}
-
static inline void flush_hugetlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
flush_tlb_page(vma, vmaddr);
}
-static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
-{
- *hpdp = __hugepd(__pa(new) | _PMD_USER | _PMD_PRESENT | _PMD_PAGE_8M);
-}
-
-static inline void hugepd_populate_kernel(hugepd_t *hpdp, pte_t *new, unsigned int pshift)
-{
- *hpdp = __hugepd(__pa(new) | _PMD_PRESENT | _PMD_PAGE_8M);
-}
-
static inline int check_and_get_huge_psize(int shift)
{
return shift_to_mmu_psize(shift);
@@ -49,6 +19,14 @@ static inline int check_and_get_huge_psize(int shift)
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
pte_t pte, unsigned long sz);
+#define __HAVE_ARCH_HUGE_PTEP_GET
+static inline pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+ if (ptep_is_8m_pmdp(mm, addr, ptep))
+ ptep = pte_offset_kernel((pmd_t *)ptep, 0);
+ return ptep_get(ptep);
+}
+
#define __HAVE_ARCH_HUGE_PTE_CLEAR
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long sz)
@@ -119,7 +119,7 @@ static inline pte_t pte_mkhuge(pte_t pte)
#define pte_mkhuge pte_mkhuge
-static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
+static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
unsigned long clr, unsigned long set, int huge);
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@@ -141,19 +141,12 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma, pte_t *pt
}
#define __ptep_set_access_flags __ptep_set_access_flags
-static inline unsigned long pgd_leaf_size(pgd_t pgd)
-{
- if (pgd_val(pgd) & _PMD_PAGE_8M)
- return SZ_8M;
- return SZ_4M;
-}
-
-#define pgd_leaf_size pgd_leaf_size
-
-static inline unsigned long pte_leaf_size(pte_t pte)
+static inline unsigned long __pte_leaf_size(pmd_t pmd, pte_t pte)
{
pte_basic_t val = pte_val(pte);
+ if (pmd_val(pmd) & _PMD_PAGE_8M)
+ return SZ_8M;
if (val & _PAGE_HUGE)
return SZ_512K;
if (val & _PAGE_SPS)
@@ -161,31 +154,38 @@ static inline unsigned long pte_leaf_size(pte_t pte)
return SZ_4K;
}
-#define pte_leaf_size pte_leaf_size
+#define __pte_leaf_size __pte_leaf_size
/*
* On the 8xx, the page tables are a bit special. For 16k pages, we have
* 4 identical entries. For 512k pages, we have 128 entries as if it was
* 4k pages, but they are flagged as 512k pages for the hardware.
- * For other page sizes, we have a single entry in the table.
+ * For 8M pages, we have 1024 entries as if it was 4M pages (PMD_SIZE)
+ * but they are flagged as 8M pages for the hardware.
+ * For 4k pages, we have a single entry in the table.
*/
static pmd_t *pmd_off(struct mm_struct *mm, unsigned long addr);
-static int hugepd_ok(hugepd_t hpd);
+static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address);
+
+static inline bool ptep_is_8m_pmdp(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+ return (pmd_t *)ptep == pmd_off(mm, ALIGN_DOWN(addr, SZ_8M));
+}
static inline int number_of_cells_per_pte(pmd_t *pmd, pte_basic_t val, int huge)
{
if (!huge)
return PAGE_SIZE / SZ_4K;
- else if (hugepd_ok(*((hugepd_t *)pmd)))
- return 1;
+ else if ((pmd_val(*pmd) & _PMD_PAGE_MASK) == _PMD_PAGE_8M)
+ return SZ_4M / SZ_4K;
else if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && !(val & _PAGE_HUGE))
return SZ_16K / SZ_4K;
else
return SZ_512K / SZ_4K;
}
-static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
- unsigned long clr, unsigned long set, int huge)
+static inline pte_basic_t __pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
+ unsigned long clr, unsigned long set, int huge)
{
pte_basic_t *entry = (pte_basic_t *)p;
pte_basic_t old = pte_val(*p);
@@ -197,7 +197,7 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
for (i = 0; i < num; i += PAGE_SIZE / SZ_4K, new += PAGE_SIZE) {
*entry++ = new;
- if (IS_ENABLED(CONFIG_PPC_16K_PAGES) && num != 1) {
+ if (IS_ENABLED(CONFIG_PPC_16K_PAGES)) {
*entry++ = new;
*entry++ = new;
*entry++ = new;
@@ -207,6 +207,21 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
return old;
}
+static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
+ unsigned long clr, unsigned long set, int huge)
+{
+ pte_basic_t old;
+
+ if (huge && ptep_is_8m_pmdp(mm, addr, ptep)) {
+ pmd_t *pmdp = (pmd_t *)ptep;
+
+ old = __pte_update(mm, addr, pte_offset_kernel(pmdp, 0), clr, set, huge);
+ __pte_update(mm, addr, pte_offset_kernel(pmdp + 1, 0), clr, set, huge);
+ } else {
+ old = __pte_update(mm, addr, ptep, clr, set, huge);
+ }
+ return old;
+}
#define pte_update pte_update
#ifdef CONFIG_PPC_16K_PAGES
@@ -343,12 +343,8 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
#ifdef CONFIG_ARCH_HAS_HUGEPD
static inline int hugepd_ok(hugepd_t hpd)
{
-#ifdef CONFIG_PPC_8xx
- return ((hpd_val(hpd) & _PMD_PAGE_MASK) == _PMD_PAGE_8M);
-#else
/* We clear the top bit to indicate hugepd */
return (hpd_val(hpd) && (hpd_val(hpd) & PD_HUGE) == 0);
-#endif
}
#define is_hugepd(hpd) (hugepd_ok(hpd))
@@ -293,13 +293,8 @@ static inline const void *pfn_to_kaddr(unsigned long pfn)
/*
* Some number of bits at the level of the page table that points to
* a hugepte are used to encode the size. This masks those bits.
- * On 8xx, HW assistance requires 4k alignment for the hugepte.
*/
-#ifdef CONFIG_PPC_8xx
-#define HUGEPD_SHIFT_MASK 0xfff
-#else
#define HUGEPD_SHIFT_MASK 0x3f
-#endif
#ifndef __ASSEMBLY__
@@ -106,6 +106,9 @@ unsigned long vmalloc_to_phys(void *vmalloc_addr);
void pgtable_cache_add(unsigned int shift);
+#ifdef CONFIG_PPC32
+void __init *early_alloc_pgtable(unsigned long size);
+#endif
pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va);
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32)
@@ -415,14 +415,13 @@ FixupDAR:/* Entry point for dcbx workaround. */
oris r11, r11, (swapper_pg_dir - PAGE_OFFSET)@ha
3:
lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
+ rlwinm r11, r11, 0, ~_PMD_PAGE_8M
mtspr SPRN_MD_TWC, r11
- mtcrf 0x01, r11
mfspr r11, SPRN_MD_TWC
lwz r11, 0(r11) /* Get the pte */
- bt 28,200f /* bit 28 = Large page (8M) */
/* concat physical page address(r11) and page offset(r10) */
rlwimi r11, r10, 0, 32 - PAGE_SHIFT, 31
-201: lwz r11,0(r11)
+ lwz r11,0(r11)
/* Check if it really is a dcbx instruction. */
/* dcbt and dcbtst does not generate DTLB Misses/Errors,
* no need to include them here */
@@ -441,11 +440,6 @@ FixupDAR:/* Entry point for dcbx workaround. */
141: mfspr r10,SPRN_M_TW
b DARFixed /* Nope, go back to normal TLB processing */
-200:
- /* concat physical page address(r11) and page offset(r10) */
- rlwimi r11, r10, 0, 32 - PAGE_SHIFT_8M, 31
- b 201b
-
144: mfspr r10, SPRN_DSISR
rlwinm r10, r10,0,7,5 /* Clear store bit for buggy dcbst insn */
mtspr SPRN_DSISR, r10
@@ -183,9 +183,6 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
if (!hpdp)
return NULL;
- if (IS_ENABLED(CONFIG_PPC_8xx) && pshift < PMD_SHIFT)
- return pte_alloc_huge(mm, (pmd_t *)hpdp, addr);
-
BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp));
if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr,
@@ -218,8 +215,18 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
if (!pmd)
return NULL;
- if (sz >= PMD_SIZE)
+ if (sz >= PMD_SIZE) {
+ /* On 8xx, all hugepages are handled as contiguous PTEs */
+ if (IS_ENABLED(CONFIG_PPC_8xx)) {
+ int i;
+
+ for (i = 0; i < sz / PMD_SIZE; i++) {
+ if (!pte_alloc_huge(mm, pmd + i, addr))
+ return NULL;
+ }
+ }
return (pte_t *)pmd;
+ }
return pte_alloc_huge(mm, pmd, addr);
}
@@ -619,8 +626,7 @@ static int __init hugetlbpage_init(void)
if (pdshift > shift) {
if (!IS_ENABLED(CONFIG_PPC_8xx))
pgtable_cache_add(pdshift - shift);
- } else if (IS_ENABLED(CONFIG_PPC_E500) ||
- IS_ENABLED(CONFIG_PPC_8xx)) {
+ } else if (IS_ENABLED(CONFIG_PPC_E500)) {
pgtable_cache_add(PTE_T_ORDER);
}
@@ -6,28 +6,33 @@
#include <linux/memblock.h>
#include <linux/hugetlb.h>
+#include <asm/pgalloc.h>
+
static int __init
kasan_init_shadow_8M(unsigned long k_start, unsigned long k_end, void *block)
{
pmd_t *pmd = pmd_off_k(k_start);
unsigned long k_cur, k_next;
- for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd += 2, block += SZ_8M) {
- pte_basic_t *new;
+ for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++, block += SZ_4M) {
+ pte_t *ptep;
+ int i;
k_next = pgd_addr_end(k_cur, k_end);
- k_next = pgd_addr_end(k_next, k_end);
if ((void *)pmd_page_vaddr(*pmd) != kasan_early_shadow_pte)
continue;
- new = memblock_alloc(sizeof(pte_basic_t), SZ_4K);
- if (!new)
+ ptep = memblock_alloc(PTE_FRAG_SIZE, PTE_FRAG_SIZE);
+ if (!ptep)
return -ENOMEM;
- *new = pte_val(pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block)), PAGE_KERNEL)));
+ for (i = 0; i < PTRS_PER_PTE; i++) {
+ pte_t pte = pte_mkhuge(pfn_pte(PHYS_PFN(__pa(block + i * PAGE_SIZE)), PAGE_KERNEL));
- hugepd_populate_kernel((hugepd_t *)pmd, (pte_t *)new, PAGE_SHIFT_8M);
- hugepd_populate_kernel((hugepd_t *)pmd + 1, (pte_t *)new, PAGE_SHIFT_8M);
+ __set_pte_at(&init_mm, k_cur, ptep + i, pte, 1);
+ }
+ pmd_populate_kernel(&init_mm, pmd, ptep);
+ *pmd = __pmd(pmd_val(*pmd) | _PMD_PAGE_8M);
}
return 0;
}
@@ -11,6 +11,7 @@
#include <linux/hugetlb.h>
#include <asm/fixmap.h>
+#include <asm/pgalloc.h>
#include <mm/mmu_decl.h>
@@ -48,20 +49,6 @@ unsigned long p_block_mapped(phys_addr_t pa)
return 0;
}
-static pte_t __init *early_hugepd_alloc_kernel(hugepd_t *pmdp, unsigned long va)
-{
- if (hpd_val(*pmdp) == 0) {
- pte_t *ptep = memblock_alloc(sizeof(pte_basic_t), SZ_4K);
-
- if (!ptep)
- return NULL;
-
- hugepd_populate_kernel((hugepd_t *)pmdp, ptep, PAGE_SHIFT_8M);
- hugepd_populate_kernel((hugepd_t *)pmdp + 1, ptep, PAGE_SHIFT_8M);
- }
- return hugepte_offset(*(hugepd_t *)pmdp, va, PGDIR_SHIFT);
-}
-
static int __ref __early_map_kernel_hugepage(unsigned long va, phys_addr_t pa,
pgprot_t prot, int psize, bool new)
{
@@ -75,24 +62,33 @@ static int __ref __early_map_kernel_hugepage(unsigned long va, phys_addr_t pa,
if (WARN_ON(slab_is_available()))
return -EINVAL;
- if (psize == MMU_PAGE_512K)
+ if (psize == MMU_PAGE_512K) {
ptep = early_pte_alloc_kernel(pmdp, va);
- else
- ptep = early_hugepd_alloc_kernel((hugepd_t *)pmdp, va);
+ /* The PTE should never be already present */
+ if (WARN_ON(pte_present(*ptep) && pgprot_val(prot)))
+ return -EINVAL;
+ } else {
+ if (WARN_ON(!pmd_none(*pmdp) || !pmd_none(*(pmdp + 1))))
+ return -EINVAL;
+
+ ptep = early_alloc_pgtable(PTE_FRAG_SIZE);
+ pmd_populate_kernel(&init_mm, pmdp, ptep);
+
+ ptep = early_alloc_pgtable(PTE_FRAG_SIZE);
+ pmd_populate_kernel(&init_mm, pmdp + 1, ptep);
+
+ ptep = (pte_t *)pmdp;
+ }
} else {
if (psize == MMU_PAGE_512K)
ptep = pte_offset_kernel(pmdp, va);
else
- ptep = hugepte_offset(*(hugepd_t *)pmdp, va, PGDIR_SHIFT);
+ ptep = (pte_t *)pmdp;
}
if (WARN_ON(!ptep))
return -ENOMEM;
- /* The PTE should never be already present */
- if (new && WARN_ON(pte_present(*ptep) && pgprot_val(prot)))
- return -EINVAL;
-
set_huge_pte_at(&init_mm, va, ptep,
pte_mkhuge(pfn_pte(pa >> PAGE_SHIFT, prot)),
1UL << mmu_psize_to_shift(psize));
@@ -297,11 +297,8 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
}
#if defined(CONFIG_PPC_8xx)
-void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
- pte_t pte, unsigned long sz)
+static void __set_huge_pte_at(pmd_t *pmd, pte_t *ptep, pte_basic_t val)
{
- pmd_t *pmd = pmd_off(mm, addr);
- pte_basic_t val;
pte_basic_t *entry = (pte_basic_t *)ptep;
int num, i;
@@ -311,15 +308,29 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
*/
VM_WARN_ON(pte_hw_valid(*ptep) && !pte_protnone(*ptep));
- pte = set_pte_filter(pte, addr);
-
- val = pte_val(pte);
-
num = number_of_cells_per_pte(pmd, val, 1);
for (i = 0; i < num; i++, entry++, val += SZ_4K)
*entry = val;
}
+
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
+ pte_t pte, unsigned long sz)
+{
+ pmd_t *pmdp = pmd_off(mm, addr);
+
+ pte = set_pte_filter(pte, addr);
+
+ if (sz == SZ_8M) { /* Flag both PMD entries as 8M and fill both page tables */
+ *pmdp = __pmd(pmd_val(*pmdp) | _PMD_PAGE_8M);
+ *(pmdp + 1) = __pmd(pmd_val(*(pmdp + 1)) | _PMD_PAGE_8M);
+
+ __set_huge_pte_at(pmdp, pte_offset_kernel(pmdp, 0), pte_val(pte));
+ __set_huge_pte_at(pmdp, pte_offset_kernel(pmdp + 1, 0), pte_val(pte) + SZ_4M);
+ } else {
+ __set_huge_pte_at(pmdp, ptep, pte_val(pte));
+ }
+}
#endif
#endif /* CONFIG_HUGETLB_PAGE */
@@ -48,7 +48,7 @@ notrace void __init early_ioremap_init(void)
early_ioremap_setup();
}
-static void __init *early_alloc_pgtable(unsigned long size)
+void __init *early_alloc_pgtable(unsigned long size)
{
void *ptr = memblock_alloc(size, size);
@@ -98,6 +98,7 @@ config PPC_BOOK3S_64
select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
select ARCH_ENABLE_SPLIT_PMD_PTLOCK
select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_HAS_HUGEPD if HUGETLB_PAGE
select ARCH_SUPPORTS_HUGETLBFS
select ARCH_SUPPORTS_NUMA_BALANCING
select HAVE_MOVE_PMD
@@ -290,6 +291,7 @@ config PPC_BOOK3S
config PPC_E500
select FSL_EMB_PERFMON
bool
+ select ARCH_HAS_HUGEPD if HUGETLB_PAGE
select ARCH_SUPPORTS_HUGETLBFS if PHYS_64BIT || PPC64
select PPC_SMP_MUXED_IPI
select PPC_DOORBELL
In order to fit better with standard Linux page tables layout, add support for 8M pages using contiguous PTE entries in a standard page table. Page tables will then be populated with 1024 similar entries and two PMD entries will point to that page table. The PMD entries also get a flag to tell it is addressing an 8M page, this is required for the HW tablewalk assistance. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- v3: - Move huge_ptep_get() for a more readable commit diff - Flag PMD as 8Mbytes in set_huge_pte_at() - Define __pte_leaf_size() - Change pte_update() instead of all huge callers of pte_update() - Added ptep_is_8m_pmdp() helper - Fixed kasan early memory 8M allocation --- arch/powerpc/Kconfig | 1 - .../include/asm/nohash/32/hugetlb-8xx.h | 38 +++---------- arch/powerpc/include/asm/nohash/32/pte-8xx.h | 53 ++++++++++++------- arch/powerpc/include/asm/nohash/pgtable.h | 4 -- arch/powerpc/include/asm/page.h | 5 -- arch/powerpc/include/asm/pgtable.h | 3 ++ arch/powerpc/kernel/head_8xx.S | 10 +--- arch/powerpc/mm/hugetlbpage.c | 18 ++++--- arch/powerpc/mm/kasan/8xx.c | 21 +++++--- arch/powerpc/mm/nohash/8xx.c | 40 +++++++------- arch/powerpc/mm/pgtable.c | 27 +++++++--- arch/powerpc/mm/pgtable_32.c | 2 +- arch/powerpc/platforms/Kconfig.cputype | 2 + 13 files changed, 112 insertions(+), 112 deletions(-)