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lib: sbi: Allow platforms to override local TLB operations

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Some T-Head based processors, for example the Sophgo SG2044, have a
JTLB errata that requires special handling of certain TLB maintenance
instructions (sfence.vma).

Introduce a sbi_tlb_local_operations structure so platforms can provide
custom local TLB flush implementations. Use it to implement the JTLB
workaround on affected SoCs (currently Sophgo SG2044).

Signed-off-by: Xiang W <wangxiang@iscas.ac.cn>
Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260617112925.1144190-2-wangxiang@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Xiang W
2026-08-20 20:30:48 +05:30
committed by Anup Patel
parent 65be0e37c4
commit f465413402
4 changed files with 101 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/sbi/sbi_tlb.c
+39 -7
View File
@@ -29,6 +29,38 @@ static unsigned long tlb_fifo_off;
static unsigned long tlb_fifo_mem_off;
static unsigned long tlb_range_flush_limit;
static void sbi_tlb_local_fence_i(struct sbi_tlb_info *tinfo);
static void sbi_tlb_local_sfence_vma(struct sbi_tlb_info *tinfo);
static void sbi_tlb_local_sfence_vma_asid(struct sbi_tlb_info *tinfo);
static void sbi_tlb_local_hfence_gvma_vmid(struct sbi_tlb_info *tinfo);
static void sbi_tlb_local_hfence_gvma(struct sbi_tlb_info *tinfo);
static void sbi_tlb_local_hfence_vvma_asid(struct sbi_tlb_info *tinfo);
static void sbi_tlb_local_hfence_vvma(struct sbi_tlb_info *tinfo);
static struct sbi_tlb_local_operations default_tlb_local_ops = {
.local_fence_i = sbi_tlb_local_fence_i,
.local_sfence_vma = sbi_tlb_local_sfence_vma,
.local_sfence_vma_asid = sbi_tlb_local_sfence_vma_asid,
.local_hfence_gvma_vmid = sbi_tlb_local_hfence_gvma_vmid,
.local_hfence_gvma = sbi_tlb_local_hfence_gvma,
.local_hfence_vvma_asid = sbi_tlb_local_hfence_vvma_asid,
.local_hfence_vvma = sbi_tlb_local_hfence_vvma
};
static const struct sbi_tlb_local_operations *tlb_local_ops =
&default_tlb_local_ops;
const struct sbi_tlb_local_operations *sbi_tlb_get_local_operations(void)
{
return tlb_local_ops;
}
void sbi_tlb_set_local_operations(
const struct sbi_tlb_local_operations *ops)
{
tlb_local_ops = ops;
}
void __sbi_sfence_vma_all(void)
{
__asm__ __volatile("sfence.vma");
@@ -183,25 +215,25 @@ static void tlb_entry_local_process(struct sbi_tlb_info *data)
switch (data->type) {
case SBI_TLB_FENCE_I:
sbi_tlb_local_fence_i(data);
tlb_local_ops->local_fence_i(data);
break;
case SBI_TLB_SFENCE_VMA:
sbi_tlb_local_sfence_vma(data);
tlb_local_ops->local_sfence_vma(data);
break;
case SBI_TLB_SFENCE_VMA_ASID:
sbi_tlb_local_sfence_vma_asid(data);
tlb_local_ops->local_sfence_vma_asid(data);
break;
case SBI_TLB_HFENCE_GVMA_VMID:
sbi_tlb_local_hfence_gvma_vmid(data);
tlb_local_ops->local_hfence_gvma_vmid(data);
break;
case SBI_TLB_HFENCE_GVMA:
sbi_tlb_local_hfence_gvma(data);
tlb_local_ops->local_hfence_gvma(data);
break;
case SBI_TLB_HFENCE_VVMA_ASID:
sbi_tlb_local_hfence_vvma_asid(data);
tlb_local_ops->local_hfence_vvma_asid(data);
break;
case SBI_TLB_HFENCE_VVMA:
sbi_tlb_local_hfence_vvma(data);
tlb_local_ops->local_hfence_vvma(data);
break;
default:
break;