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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
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include/sbi/sbi_tlb.h
+31
View File
@@ -54,6 +54,37 @@ do { \
#define SBI_TLB_INFO_SIZE sizeof(struct sbi_tlb_info)
/** Collection of Local TLB operations */
struct sbi_tlb_local_operations {
/** Local fence.i */
void (*local_fence_i)(struct sbi_tlb_info *tinfo);
/** Local supervisor-mode TLB flush */
void (*local_sfence_vma)(struct sbi_tlb_info *tinfo);
/** Local supervisor-mode TLB flush with ASID */
void (*local_sfence_vma_asid)(struct sbi_tlb_info *tinfo);
/** Local G-stage TLB flush for a specific VMID */
void (*local_hfence_gvma_vmid)(struct sbi_tlb_info *tinfo);
/** Local G-stage TLB flush */
void (*local_hfence_gvma)(struct sbi_tlb_info *tinfo);
/** Local VS-stage TLB flush with ASID */
void (*local_hfence_vvma_asid)(struct sbi_tlb_info *tinfo);
/** Local VS-stage TLB flush */
void (*local_hfence_vvma)(struct sbi_tlb_info *tinfo);
};
/** Get the local TLB operations */
const struct sbi_tlb_local_operations *sbi_tlb_get_local_operations(void);
/** Set the local TLB operations */
void sbi_tlb_set_local_operations(
const struct sbi_tlb_local_operations *ops);
void __sbi_sfence_vma_all();
int sbi_tlb_request(ulong hmask, ulong hbase, struct sbi_tlb_info *tinfo);