diff options
Diffstat (limited to 'drivers/ras/amd/atl/umc.c')
| -rw-r--r-- | drivers/ras/amd/atl/umc.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/ras/amd/atl/umc.c b/drivers/ras/amd/atl/umc.c index 7e310d1dfcfc..08c6dbd44c62 100644 --- a/drivers/ras/amd/atl/umc.c +++ b/drivers/ras/amd/atl/umc.c @@ -239,6 +239,57 @@ static unsigned long convert_dram_to_norm_addr_mi300(unsigned long addr) return addr; } +/* + * When a DRAM ECC error occurs on MI300 systems, it is recommended to retire + * all memory within that DRAM row. This applies to the memory with a DRAM + * bank. + * + * To find the memory addresses, loop through permutations of the DRAM column + * bits and find the System Physical address of each. The column bits are used + * to calculate the intermediate Normalized address, so all permutations should + * be checked. + * + * See amd_atl::convert_dram_to_norm_addr_mi300() for MI300 address formats. + */ +#define MI300_NUM_COL BIT(HWEIGHT(MI300_UMC_MCA_COL)) +static void retire_row_mi300(struct atl_err *a_err) +{ + unsigned long addr; + struct page *p; + u8 col; + + for (col = 0; col < MI300_NUM_COL; col++) { + a_err->addr &= ~MI300_UMC_MCA_COL; + a_err->addr |= FIELD_PREP(MI300_UMC_MCA_COL, col); + + addr = amd_convert_umc_mca_addr_to_sys_addr(a_err); + if (IS_ERR_VALUE(addr)) + continue; + + addr = PHYS_PFN(addr); + + /* + * Skip invalid or already poisoned pages to avoid unnecessary + * error messages from memory_failure(). + */ + p = pfn_to_online_page(addr); + if (!p) + continue; + + if (PageHWPoison(p)) + continue; + + memory_failure(addr, 0); + } +} + +void amd_retire_dram_row(struct atl_err *a_err) +{ + if (df_cfg.rev == DF4p5 && df_cfg.flags.heterogeneous) + return retire_row_mi300(a_err); +} +EXPORT_SYMBOL_GPL(amd_retire_dram_row); + static unsigned long get_addr(unsigned long addr) { if (df_cfg.rev == DF4p5 && df_cfg.flags.heterogeneous) |