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ANDROID: GKI: arm64: fault: do_tlb_conf_fault_cb register fault callback

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Allow for vendor components or modules to override
"TLB conflict abort" handler,

Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Test: Verified with scripts/gki/device_snapshot
Test: No impact on /sys/ (except new module files) and /dev/
Test: All devices probed as before
Bug: 141888626
Change-Id: I7d0a4d7440412f2ffc611fe597d5d39d18a2a03a
(cherry picked from commit 75c07a4fbd301fbff1522e66996bad91617cd06f)
Bug: 149990629
This commit is contained in:
Mark Salyzyn
2020-02-24 15:02:45 -08:00
parent 723feab600
commit 08bcbfbf7c
2 changed files with 29 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm64/include/asm/traps.h
View File

@@ -120,4 +120,12 @@ static inline u32 arm64_ras_serror_get_severity(u32 esr)
bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr);
void __noreturn arm64_serror_panic(struct pt_regs *regs, u32 esr);
extern int (*do_tlb_conf_fault_cb)(unsigned long addr,
unsigned int esr,
struct pt_regs *regs);
extern int do_tlb_conf_fault(unsigned long addr,
unsigned int esr,
struct pt_regs *regs);
#endif

22
arch/arm64/mm/fault.c
View File

@@ -613,6 +613,26 @@ no_context:
return 0;
}
int __weak do_tlb_conf_fault(unsigned long addr,
unsigned int esr,
struct pt_regs *regs)
{
return 1; /* do_bad default */
}
int (*do_tlb_conf_fault_cb)(unsigned long addr,
unsigned int esr,
struct pt_regs *regs)
= do_tlb_conf_fault; /* initialization saves us a branch */
EXPORT_SYMBOL_GPL(do_tlb_conf_fault_cb);
static int _do_tlb_conf_fault(unsigned long addr,
unsigned int esr,
struct pt_regs *regs)
{
return (*do_tlb_conf_fault_cb)(addr, esr, regs);
}
static int __kprobes do_translation_fault(unsigned long addr,
unsigned int esr,
struct pt_regs *regs)
@@ -720,7 +740,7 @@ static const struct fault_info fault_info[] = {
{ do_bad, SIGKILL, SI_KERNEL, "unknown 45" },
{ do_bad, SIGKILL, SI_KERNEL, "unknown 46" },
{ do_bad, SIGKILL, SI_KERNEL, "unknown 47" },
{ do_bad, SIGKILL, SI_KERNEL, "TLB conflict abort" },
{ _do_tlb_conf_fault, SIGKILL, SI_KERNEL, "TLB conflict abort" },
{ do_bad, SIGKILL, SI_KERNEL, "Unsupported atomic hardware update fault" },
{ do_bad, SIGKILL, SI_KERNEL, "unknown 50" },
{ do_bad, SIGKILL, SI_KERNEL, "unknown 51" },