diff options
| author | Heiko Carstens | 2024-07-15 10:33:06 +0200 |
|---|---|---|
| committer | Vasily Gorbik | 2024-07-23 15:54:58 +0200 |
| commit | 57e29f4c8919af7276c35c2da0ae5efb4c36c33e (patch) | |
| tree | c7268d85fc3fafbb4678a4106775b7c4488066ca /arch/s390 | |
| parent | 66ebbdfdeb093e097399b1883390079cd4c3022b (diff) | |
s390: Add runtime constant support
Implement the runtime constant infrastructure for s390, allowing the
dcache d_hash() function to be generated using as a constant for hash
table address followed by shift by a constant of the hash index.
This is the s390 variant of commit 94a2bc0f611c ("arm64: add 'runtime
constant' support") and commit e3c92e81711d ("runtime constants: add
x86 architecture support").
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/runtime-const.h | 77 | ||||
| -rw-r--r-- | arch/s390/kernel/vmlinux.lds.S | 3 |
2 files changed, 80 insertions, 0 deletions
diff --git a/arch/s390/include/asm/runtime-const.h b/arch/s390/include/asm/runtime-const.h new file mode 100644 index 000000000000..17878b1d048c --- /dev/null +++ b/arch/s390/include/asm/runtime-const.h @@ -0,0 +1,77 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_S390_RUNTIME_CONST_H +#define _ASM_S390_RUNTIME_CONST_H + +#include <linux/uaccess.h> + +#define runtime_const_ptr(sym) \ +({ \ + typeof(sym) __ret; \ + \ + asm_inline( \ + "0: iihf %[__ret],%[c1]\n" \ + " iilf %[__ret],%[c2]\n" \ + ".pushsection runtime_ptr_" #sym ",\"a\"\n" \ + ".long 0b - .\n" \ + ".popsection" \ + : [__ret] "=d" (__ret) \ + : [c1] "i" (0x01234567UL), \ + [c2] "i" (0x89abcdefUL)); \ + __ret; \ +}) + +#define runtime_const_shift_right_32(val, sym) \ +({ \ + unsigned int __ret = (val); \ + \ + asm_inline( \ + "0: srl %[__ret],12\n" \ + ".pushsection runtime_shift_" #sym ",\"a\"\n" \ + ".long 0b - .\n" \ + ".popsection" \ + : [__ret] "+d" (__ret)); \ + __ret; \ +}) + +#define runtime_const_init(type, sym) do { \ + extern s32 __start_runtime_##type##_##sym[]; \ + extern s32 __stop_runtime_##type##_##sym[]; \ + \ + runtime_const_fixup(__runtime_fixup_##type, \ + (unsigned long)(sym), \ + __start_runtime_##type##_##sym, \ + __stop_runtime_##type##_##sym); \ +} while (0) + +/* 32-bit immediate for iihf and iilf in bits in I2 field */ +static inline void __runtime_fixup_32(u32 *p, unsigned int val) +{ + s390_kernel_write(p, &val, sizeof(val)); +} + +static inline void __runtime_fixup_ptr(void *where, unsigned long val) +{ + __runtime_fixup_32(where + 2, val >> 32); + __runtime_fixup_32(where + 8, val); +} + +/* Immediate value is lower 12 bits of D2 field of srl */ +static inline void __runtime_fixup_shift(void *where, unsigned long val) +{ + u32 insn = *(u32 *)where; + + insn &= 0xfffff000; + insn |= (val & 63); + s390_kernel_write(where, &insn, sizeof(insn)); +} + +static inline void runtime_const_fixup(void (*fn)(void *, unsigned long), + unsigned long val, s32 *start, s32 *end) +{ + while (start < end) { + fn(*start + (void *)start, val); + start++; + } +} + +#endif /* _ASM_S390_RUNTIME_CONST_H */ diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S index a1ce3925ec71..5128ccee9c67 100644 --- a/arch/s390/kernel/vmlinux.lds.S +++ b/arch/s390/kernel/vmlinux.lds.S @@ -190,6 +190,9 @@ SECTIONS . = ALIGN(PAGE_SIZE); INIT_DATA_SECTION(0x100) + RUNTIME_CONST(shift, d_hash_shift) + RUNTIME_CONST(ptr, dentry_hashtable) + PERCPU_SECTION(0x100) . = ALIGN(PAGE_SIZE); |