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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4a7ac12eed
The dsb instruction takes an option specifying both the target access types and shareability domain. This patch allows such an option to be passed to the dsb macro, resulting in potentially more efficient code. Currently the option is ignored until all callers are updated (unlike ARM, the option is mandated by the assembler). Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/*
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* Based on arch/arm/include/asm/barrier.h
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*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_BARRIER_H
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#define __ASM_BARRIER_H
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#ifndef __ASSEMBLY__
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#define sev() asm volatile("sev" : : : "memory")
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#define wfe() asm volatile("wfe" : : : "memory")
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#define wfi() asm volatile("wfi" : : : "memory")
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#define isb() asm volatile("isb" : : : "memory")
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#define dsb(opt) asm volatile("dsb sy" : : : "memory")
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#define mb() dsb()
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#define rmb() asm volatile("dsb ld" : : : "memory")
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#define wmb() asm volatile("dsb st" : : : "memory")
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#ifndef CONFIG_SMP
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_store_release(p, v) \
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do { \
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compiletime_assert_atomic_type(*p); \
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smp_mb(); \
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ACCESS_ONCE(*p) = (v); \
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} while (0)
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#define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p1 = ACCESS_ONCE(*p); \
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compiletime_assert_atomic_type(*p); \
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smp_mb(); \
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___p1; \
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})
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#else
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#define smp_mb() asm volatile("dmb ish" : : : "memory")
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#define smp_rmb() asm volatile("dmb ishld" : : : "memory")
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#define smp_wmb() asm volatile("dmb ishst" : : : "memory")
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#define smp_store_release(p, v) \
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do { \
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compiletime_assert_atomic_type(*p); \
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switch (sizeof(*p)) { \
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case 4: \
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asm volatile ("stlr %w1, %0" \
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: "=Q" (*p) : "r" (v) : "memory"); \
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break; \
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case 8: \
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asm volatile ("stlr %1, %0" \
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: "=Q" (*p) : "r" (v) : "memory"); \
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break; \
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} \
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} while (0)
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#define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p1; \
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compiletime_assert_atomic_type(*p); \
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switch (sizeof(*p)) { \
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case 4: \
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asm volatile ("ldar %w0, %1" \
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: "=r" (___p1) : "Q" (*p) : "memory"); \
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break; \
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case 8: \
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asm volatile ("ldar %0, %1" \
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: "=r" (___p1) : "Q" (*p) : "memory"); \
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break; \
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} \
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___p1; \
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})
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#endif
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#define read_barrier_depends() do { } while(0)
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#define smp_read_barrier_depends() do { } while(0)
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#define set_mb(var, value) do { var = value; smp_mb(); } while (0)
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#define nop() asm volatile("nop");
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_BARRIER_H */
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