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riscv: mm: Add support for Svinval extension #176

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Sep 6, 2024
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riscv: mm: Add support for Svinval extension #176

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31 changes: 31 additions & 0 deletions arch/riscv/mm/tlbflush.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,27 @@
#include <linux/sched.h>
#include <asm/sbi.h>
#include <asm/mmu_context.h>
#include <asm/cpufeature.h>

#define has_svinval() riscv_has_extension_unlikely(RISCV_ISA_EXT_SVINVAL)

static inline void local_sfence_inval_ir(void)
{
asm volatile(SFENCE_INVAL_IR() ::: "memory");
}

static inline void local_sfence_w_inval(void)
{
asm volatile(SFENCE_W_INVAL() ::: "memory");
}

static inline void local_sinval_vma(unsigned long vma, unsigned long asid)
{
if (asid != FLUSH_TLB_NO_ASID)
asm volatile(SINVAL_VMA( %0, %1) : : "r" (vma), "r" (asid) : "memory");

Check failure on line 25 in arch/riscv/mm/tlbflush.c

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ERROR: need consistent spacing around '%' (ctx:WxV)

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ERROR: need consistent spacing around '%' (ctx:WxV)

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ERROR: space prohibited after that open parenthesis '('
else
asm volatile(SINVAL_VMA( %0, zero) : : "r" (vma) : "memory");

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ERROR: need consistent spacing around '%' (ctx:WxV)

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ERROR: space prohibited after that open parenthesis '('
}

static inline void local_flush_tlb_all_asid(unsigned long asid)
{
Expand Down Expand Up @@ -48,6 +69,16 @@
return;
}

if (has_svinval()) {
local_sfence_w_inval();
for (i = 0; i < nr_ptes_in_range; ++i) {
local_sinval_vma(start, asid);
start += stride;
}
local_sfence_inval_ir();
return;
}

for (i = 0; i < nr_ptes_in_range; ++i) {
local_flush_tlb_page_asid(start, asid);
start += stride;
Expand Down