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lib: sbi: Correctly limit flushes to a single ASID/VMID

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Per the SBI specification, the effects of these functions are limited to
a specific ASID and/or VMID. This applies even when flushing the entire
address space.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland 2023-10-17 15:20:19 -07:00 • committed by Anup Patel
parent 3e21b96003
commit a140a4e862
1 changed files with 3 additions and 18 deletions
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21
lib/sbi/sbi_tlb.c
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@ -111,12 +111,7 @@ void sbi_tlb_local_hfence_vvma_asid(struct sbi_tlb_info *tinfo)
hgatp = csr_swap(CSR_HGATP,
(vmid << HGATP_VMID_SHIFT) & HGATP_VMID_MASK);
if (start == 0 && size == 0) {
__sbi_hfence_vvma_all();
goto done;
}
if (size == SBI_TLB_FLUSH_ALL) {
if ((start == 0 && size == 0) || (size == SBI_TLB_FLUSH_ALL)) {
__sbi_hfence_vvma_asid(asid);
goto done;
}
@ -138,12 +133,7 @@ void sbi_tlb_local_hfence_gvma_vmid(struct sbi_tlb_info *tinfo)
sbi_pmu_ctr_incr_fw(SBI_PMU_FW_HFENCE_GVMA_VMID_RCVD);
if (start == 0 && size == 0) {
__sbi_hfence_gvma_all();
return;
}
if (size == SBI_TLB_FLUSH_ALL) {
if ((start == 0 && size == 0) || (size == SBI_TLB_FLUSH_ALL)) {
__sbi_hfence_gvma_vmid(vmid);
return;
}
@ -162,13 +152,8 @@ void sbi_tlb_local_sfence_vma_asid(struct sbi_tlb_info *tinfo)
sbi_pmu_ctr_incr_fw(SBI_PMU_FW_SFENCE_VMA_ASID_RCVD);
if (start == 0 && size == 0) {
tlb_flush_all();
return;
}
/* Flush entire MM context for a given ASID */
if (size == SBI_TLB_FLUSH_ALL) {
if ((start == 0 && size == 0) || (size == SBI_TLB_FLUSH_ALL)) {
__asm__ __volatile__("sfence.vma x0, %0"
:
: "r"(asid)