[PATCH v2 4/4] riscv: convert pgtable_l4|[l5]_enabled to static key

From: Jisheng Zhang
Date: Sun May 08 2022 - 12:17:02 EST

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Previous message: Jisheng Zhang: "[PATCH v2 3/4] riscv: replace has_fpu() with system_supports_fpu()"
In reply to: Anup Patel: "Re: [PATCH v2 3/4] riscv: replace has_fpu() with system_supports_fpu()"
Next in thread: Anup Patel: "Re: [PATCH v2 4/4] riscv: convert pgtable_l4|[l5]_enabled to static key"
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On a specific HW platform, pgtable_l4|[l5]_enabled won't change after
boot, and the check sits at hot code path, this characteristic makes it
suitable for optimization with static key.

Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
---
arch/riscv/include/asm/cpufeature.h | 11 +++++++
arch/riscv/include/asm/pgalloc.h | 16 +++++-----
arch/riscv/include/asm/pgtable-64.h | 40 ++++++++++++-------------
arch/riscv/include/asm/pgtable.h | 5 ++--
arch/riscv/kernel/cpu.c | 4 +--
arch/riscv/mm/init.c | 46 +++++++++++++----------------
arch/riscv/mm/kasan_init.c | 16 +++++-----
arch/riscv/tools/cpucaps | 2 ++
8 files changed, 73 insertions(+), 67 deletions(-)

diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/cpufeature.h
index 634a653c7fa2..a51f2602a0e3 100644
--- a/arch/riscv/include/asm/cpufeature.h
+++ b/arch/riscv/include/asm/cpufeature.h
@@ -96,4 +96,15 @@ static inline bool system_supports_fpu(void)
return IS_ENABLED(CONFIG_FPU) && !cpus_have_final_cap(RISCV_HAS_NO_FPU);
}

+static inline bool system_supports_sv48(void)
+{
+ return IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL) &&
+ !cpus_have_const_cap(RISCV_HAS_NO_SV48);
+}
+
+static inline bool system_supports_sv57(void)
+{
+ return IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL) &&
+ !cpus_have_const_cap(RISCV_HAS_NO_SV57);
+}
#endif
diff --git a/arch/riscv/include/asm/pgalloc.h b/arch/riscv/include/asm/pgalloc.h
index 947f23d7b6af..f49233ca696a 100644
--- a/arch/riscv/include/asm/pgalloc.h
+++ b/arch/riscv/include/asm/pgalloc.h
@@ -41,7 +41,7 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)

static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
- if (pgtable_l4_enabled) {
+ if (system_supports_sv48()) {
unsigned long pfn = virt_to_pfn(pud);

set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
@@ -51,7 +51,7 @@ static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d,
pud_t *pud)
{
- if (pgtable_l4_enabled) {
+ if (system_supports_sv48()) {
unsigned long pfn = virt_to_pfn(pud);

set_p4d_safe(p4d,
@@ -61,7 +61,7 @@ static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d,

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
- if (pgtable_l5_enabled) {
+ if (system_supports_sv57()) {
unsigned long pfn = virt_to_pfn(p4d);

set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
@@ -71,7 +71,7 @@ static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd,
p4d_t *p4d)
{
- if (pgtable_l5_enabled) {
+ if (system_supports_sv57()) {
unsigned long pfn = virt_to_pfn(p4d);

set_pgd_safe(pgd,
@@ -82,7 +82,7 @@ static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd,
#define pud_alloc_one pud_alloc_one
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
return __pud_alloc_one(mm, addr);

return NULL;
@@ -91,7 +91,7 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
#define pud_free pud_free
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
__pud_free(mm, pud);
}

@@ -100,7 +100,7 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
#define p4d_alloc_one p4d_alloc_one
static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- if (pgtable_l5_enabled) {
+ if (system_supports_sv57()) {
gfp_t gfp = GFP_PGTABLE_USER;

if (mm == &init_mm)
@@ -120,7 +120,7 @@ static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
#define p4d_free p4d_free
static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
__p4d_free(mm, p4d);
}

diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 7e246e9f8d70..9ee4abf0f528 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -7,17 +7,15 @@
#define _ASM_RISCV_PGTABLE_64_H

#include <linux/const.h>
-
-extern bool pgtable_l4_enabled;
-extern bool pgtable_l5_enabled;
+#include <asm/cpufeature.h>

#define PGDIR_SHIFT_L3 30
#define PGDIR_SHIFT_L4 39
#define PGDIR_SHIFT_L5 48
#define PGDIR_SIZE_L3 (_AC(1, UL) << PGDIR_SHIFT_L3)

-#define PGDIR_SHIFT (pgtable_l5_enabled ? PGDIR_SHIFT_L5 : \
- (pgtable_l4_enabled ? PGDIR_SHIFT_L4 : PGDIR_SHIFT_L3))
+#define PGDIR_SHIFT (system_supports_sv57() ? PGDIR_SHIFT_L5 : \
+ (system_supports_sv48() ? PGDIR_SHIFT_L4 : PGDIR_SHIFT_L3))
/* Size of region mapped by a page global directory */
#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
@@ -119,7 +117,7 @@ static inline struct page *pud_page(pud_t pud)
#define mm_p4d_folded mm_p4d_folded
static inline bool mm_p4d_folded(struct mm_struct *mm)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
return false;

return true;
@@ -128,7 +126,7 @@ static inline bool mm_p4d_folded(struct mm_struct *mm)
#define mm_pud_folded mm_pud_folded
static inline bool mm_pud_folded(struct mm_struct *mm)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
return false;

return true;
@@ -159,7 +157,7 @@ static inline unsigned long _pmd_pfn(pmd_t pmd)

static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
*p4dp = p4d;
else
set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
@@ -167,7 +165,7 @@ static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)

static inline int p4d_none(p4d_t p4d)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
return (p4d_val(p4d) == 0);

return 0;
@@ -175,7 +173,7 @@ static inline int p4d_none(p4d_t p4d)

static inline int p4d_present(p4d_t p4d)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
return (p4d_val(p4d) & _PAGE_PRESENT);

return 1;
@@ -183,7 +181,7 @@ static inline int p4d_present(p4d_t p4d)

static inline int p4d_bad(p4d_t p4d)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
return !p4d_present(p4d);

return 0;
@@ -191,7 +189,7 @@ static inline int p4d_bad(p4d_t p4d)

static inline void p4d_clear(p4d_t *p4d)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
set_p4d(p4d, __p4d(0));
}

@@ -207,7 +205,7 @@ static inline unsigned long _p4d_pfn(p4d_t p4d)

static inline pud_t *p4d_pgtable(p4d_t p4d)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
return (pud_t *)pfn_to_virt(p4d_val(p4d) >> _PAGE_PFN_SHIFT);

return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
@@ -224,7 +222,7 @@ static inline struct page *p4d_page(p4d_t p4d)
#define pud_offset pud_offset
static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
{
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
return p4d_pgtable(*p4d) + pud_index(address);

return (pud_t *)p4d;
@@ -232,7 +230,7 @@ static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)

static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
*pgdp = pgd;
else
set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
@@ -240,7 +238,7 @@ static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)

static inline int pgd_none(pgd_t pgd)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
return (pgd_val(pgd) == 0);

return 0;
@@ -248,7 +246,7 @@ static inline int pgd_none(pgd_t pgd)

static inline int pgd_present(pgd_t pgd)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
return (pgd_val(pgd) & _PAGE_PRESENT);

return 1;
@@ -256,7 +254,7 @@ static inline int pgd_present(pgd_t pgd)

static inline int pgd_bad(pgd_t pgd)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
return !pgd_present(pgd);

return 0;
@@ -264,13 +262,13 @@ static inline int pgd_bad(pgd_t pgd)

static inline void pgd_clear(pgd_t *pgd)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
set_pgd(pgd, __pgd(0));
}

static inline p4d_t *pgd_pgtable(pgd_t pgd)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
return (p4d_t *)pfn_to_virt(pgd_val(pgd) >> _PAGE_PFN_SHIFT);

return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
@@ -288,7 +286,7 @@ static inline struct page *pgd_page(pgd_t pgd)
#define p4d_offset p4d_offset
static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
{
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
return pgd_pgtable(*pgd) + p4d_index(address);

return (p4d_t *)pgd;
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 046b44225623..ef2a1654100a 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -63,8 +63,8 @@
* position vmemmap directly below the VMALLOC region.
*/
#ifdef CONFIG_64BIT
-#define VA_BITS (pgtable_l5_enabled ? \
- 57 : (pgtable_l4_enabled ? 48 : 39))
+#define VA_BITS (system_supports_sv57() ? \
+ 57 : (system_supports_sv48() ? 48 : 39))
#else
#define VA_BITS 32
#endif
@@ -738,7 +738,6 @@ extern uintptr_t _dtb_early_pa;
#define dtb_early_pa _dtb_early_pa
#endif /* CONFIG_XIP_KERNEL */
extern u64 satp_mode;
-extern bool pgtable_l4_enabled;

void paging_init(void);
void misc_mem_init(void);
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index ccb617791e56..c8f3989b08f3 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -141,9 +141,9 @@ static void print_mmu(struct seq_file *f)
#if defined(CONFIG_32BIT)
strncpy(sv_type, "sv32", 5);
#elif defined(CONFIG_64BIT)
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
strncpy(sv_type, "sv57", 5);
- else if (pgtable_l4_enabled)
+ else if (system_supports_sv48())
strncpy(sv_type, "sv48", 5);
else
strncpy(sv_type, "sv39", 5);
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 5f3f26dd9f21..b6a59a5d1a7f 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -21,6 +21,7 @@
#include <linux/crash_dump.h>
#include <linux/hugetlb.h>

+#include <asm/cpufeature.h>
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
#include <asm/sections.h>
@@ -44,11 +45,6 @@ u64 satp_mode __ro_after_init = SATP_MODE_32;
#endif
EXPORT_SYMBOL(satp_mode);

-bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
-bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
-EXPORT_SYMBOL(pgtable_l4_enabled);
-EXPORT_SYMBOL(pgtable_l5_enabled);
-
phys_addr_t phys_ram_base __ro_after_init;
EXPORT_SYMBOL(phys_ram_base);

@@ -555,26 +551,26 @@ static void __init create_p4d_mapping(p4d_t *p4dp,
}

#define pgd_next_t p4d_t
-#define alloc_pgd_next(__va) (pgtable_l5_enabled ? \
- pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \
+#define alloc_pgd_next(__va) (system_supports_sv57() ? \
+ pt_ops.alloc_p4d(__va) : (system_supports_sv48() ? \
pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va)))
-#define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \
- pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \
+#define get_pgd_next_virt(__pa) (system_supports_sv57() ? \
+ pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(system_supports_sv48() ? \
pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa)))
#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
- (pgtable_l5_enabled ? \
+ (system_supports_sv57() ? \
create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \
- (pgtable_l4_enabled ? \
+ (system_supports_sv48() ? \
create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
-#define fixmap_pgd_next (pgtable_l5_enabled ? \
- (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
+#define fixmap_pgd_next (system_supports_sv57() ? \
+ (uintptr_t)fixmap_p4d : (system_supports_sv48() ? \
(uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
-#define trampoline_pgd_next (pgtable_l5_enabled ? \
- (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
+#define trampoline_pgd_next (system_supports_sv57() ? \
+ (uintptr_t)trampoline_p4d : (system_supports_sv48() ? \
(uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
-#define early_dtb_pgd_next (pgtable_l5_enabled ? \
- (uintptr_t)early_dtb_p4d : (pgtable_l4_enabled ? \
+#define early_dtb_pgd_next (system_supports_sv57() ? \
+ (uintptr_t)early_dtb_p4d : (system_supports_sv48() ? \
(uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd))
#else
#define pgd_next_t pte_t
@@ -680,14 +676,14 @@ static __init pgprot_t pgprot_from_va(uintptr_t va)
#ifdef CONFIG_64BIT
static void __init disable_pgtable_l5(void)
{
- pgtable_l5_enabled = false;
+ cpus_set_cap(RISCV_HAS_NO_SV57);
kernel_map.page_offset = PAGE_OFFSET_L4;
satp_mode = SATP_MODE_48;
}

static void __init disable_pgtable_l4(void)
{
- pgtable_l4_enabled = false;
+ cpus_set_cap(RISCV_HAS_NO_SV48);
kernel_map.page_offset = PAGE_OFFSET_L3;
satp_mode = SATP_MODE_39;
}
@@ -816,11 +812,11 @@ static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
PGDIR_SIZE,
IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);

- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA,
(uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE);

- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA,
(uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);

@@ -961,11 +957,11 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)

#ifndef __PAGETABLE_PMD_FOLDED
/* Setup fixmap P4D and PUD */
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
create_p4d_mapping(fixmap_p4d, FIXADDR_START,
(uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE);
/* Setup fixmap PUD and PMD */
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
create_pud_mapping(fixmap_pud, FIXADDR_START,
(uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE);
create_pmd_mapping(fixmap_pmd, FIXADDR_START,
@@ -973,10 +969,10 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
/* Setup trampoline PGD and PMD */
create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE);
- if (pgtable_l5_enabled)
+ if (system_supports_sv57())
create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr,
(uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE);
- if (pgtable_l4_enabled)
+ if (system_supports_sv48())
create_pud_mapping(trampoline_pud, kernel_map.virt_addr,
(uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE);
#ifdef CONFIG_XIP_KERNEL
diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index a22e418dbd82..7b662661f7a9 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -209,15 +209,15 @@ static void __init kasan_populate_p4d(pgd_t *pgd,
set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(base_p4d)), PAGE_TABLE));
}

-#define kasan_early_shadow_pgd_next (pgtable_l5_enabled ? \
+#define kasan_early_shadow_pgd_next (system_supports_sv57() ? \
(uintptr_t)kasan_early_shadow_p4d : \
- (pgtable_l4_enabled ? \
+ (system_supports_sv48() ? \
(uintptr_t)kasan_early_shadow_pud : \
(uintptr_t)kasan_early_shadow_pmd))
#define kasan_populate_pgd_next(pgdp, vaddr, next, early) \
- (pgtable_l5_enabled ? \
+ (system_supports_sv57() ? \
kasan_populate_p4d(pgdp, vaddr, next, early) : \
- (pgtable_l4_enabled ? \
+ (system_supports_sv48() ? \
kasan_populate_pud(pgdp, vaddr, next, early) : \
kasan_populate_pmd((pud_t *)pgdp, vaddr, next)))

@@ -274,7 +274,7 @@ asmlinkage void __init kasan_early_init(void)
(__pa((uintptr_t)kasan_early_shadow_pte)),
PAGE_TABLE));

- if (pgtable_l4_enabled) {
+ if (system_supports_sv48()) {
for (i = 0; i < PTRS_PER_PUD; ++i)
set_pud(kasan_early_shadow_pud + i,
pfn_pud(PFN_DOWN
@@ -282,7 +282,7 @@ asmlinkage void __init kasan_early_init(void)
PAGE_TABLE));
}

- if (pgtable_l5_enabled) {
+ if (system_supports_sv57()) {
for (i = 0; i < PTRS_PER_P4D; ++i)
set_p4d(kasan_early_shadow_p4d + i,
pfn_p4d(PFN_DOWN
@@ -393,9 +393,9 @@ static void __init kasan_shallow_populate_p4d(pgd_t *pgdp,
}

#define kasan_shallow_populate_pgd_next(pgdp, vaddr, next) \
- (pgtable_l5_enabled ? \
+ (system_supports_sv57() ? \
kasan_shallow_populate_p4d(pgdp, vaddr, next) : \
- (pgtable_l4_enabled ? \
+ (system_supports_sv48() ? \
kasan_shallow_populate_pud(pgdp, vaddr, next) : \
kasan_shallow_populate_pmd(pgdp, vaddr, next)))

diff --git a/arch/riscv/tools/cpucaps b/arch/riscv/tools/cpucaps
index cb1ff2747859..0b9e19ec8371 100644
--- a/arch/riscv/tools/cpucaps
+++ b/arch/riscv/tools/cpucaps
@@ -3,3 +3,5 @@
# Internal CPU capabilities constants, keep this list sorted

HAS_NO_FPU
+HAS_NO_SV48
+HAS_NO_SV57
--
2.34.1

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