diff options
Diffstat (limited to 'arch/powerpc/include/asm/plpar_wrappers.h')
| -rw-r--r-- | arch/powerpc/include/asm/plpar_wrappers.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/plpar_wrappers.h b/arch/powerpc/include/asm/plpar_wrappers.h index 4497c8afb573..4293c5d2ddf4 100644 --- a/arch/powerpc/include/asm/plpar_wrappers.h +++ b/arch/powerpc/include/asm/plpar_wrappers.h @@ -334,6 +334,51 @@ static inline long plpar_get_cpu_characteristics(struct h_cpu_char_result *p) return rc; } +/* + * Wrapper to H_RPT_INVALIDATE hcall that handles return values appropriately + * + * - Returns H_SUCCESS on success + * - For H_BUSY return value, we retry the hcall. + * - For any other hcall failures, attempt a full flush once before + * resorting to BUG(). + * + * Note: This hcall is expected to fail only very rarely. The correct + * error recovery of killing the process/guest will be eventually + * needed. + */ +static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type, + u64 page_sizes, u64 start, u64 end) +{ + long rc; + unsigned long all; + + while (true) { + rc = plpar_hcall_norets(H_RPT_INVALIDATE, pid, target, type, + page_sizes, start, end); + if (rc == H_BUSY) { + cpu_relax(); + continue; + } else if (rc == H_SUCCESS) + return rc; + + /* Flush request failed, try with a full flush once */ + if (type & H_RPTI_TYPE_NESTED) + all = H_RPTI_TYPE_NESTED | H_RPTI_TYPE_NESTED_ALL; + else + all = H_RPTI_TYPE_ALL; +retry: + rc = plpar_hcall_norets(H_RPT_INVALIDATE, pid, target, + all, page_sizes, 0, -1UL); + if (rc == H_BUSY) { + cpu_relax(); + goto retry; + } else if (rc == H_SUCCESS) + return rc; + + BUG(); + } +} + #else /* !CONFIG_PPC_PSERIES */ static inline long plpar_set_ciabr(unsigned long ciabr) @@ -346,6 +391,13 @@ static inline long plpar_pte_read_4(unsigned long flags, unsigned long ptex, { return 0; } + +static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type, + u64 page_sizes, u64 start, u64 end) +{ + return 0; +} + #endif /* CONFIG_PPC_PSERIES */ #endif /* _ASM_POWERPC_PLPAR_WRAPPERS_H */ |