diff options
| author | Yazen Ghannam <yazen.ghannam@amd.com> | 2024-02-13 21:35:15 -0600 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-02-14 17:10:06 +0100 |
| commit | 3b566b30b41401888ee0e8eb904a1e7a6693794b (patch) | |
| tree | 5e45761649c11d67ad7b4177cce84052afbf446b | |
| parent | 0e4fd816b08e85484e4dbe06e91466c85273f8e0 (diff) | |
| download | lwn-3b566b30b41401888ee0e8eb904a1e7a6693794b.tar.gz lwn-3b566b30b41401888ee0e8eb904a1e7a6693794b.zip | |
RAS/AMD/ATL: Add MI300 row retirement support
DRAM row retirement depends on model-specific information that is best
done within the AMD Address Translation Library.
Export a generic wrapper function for other modules to use. Add any
model-specific helpers here.
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240214033516.1344948-2-yazen.ghannam@amd.com
| -rw-r--r-- | drivers/ras/amd/atl/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/ras/amd/atl/umc.c | 51 | ||||
| -rw-r--r-- | include/linux/ras.h | 2 |
3 files changed, 54 insertions, 0 deletions
diff --git a/drivers/ras/amd/atl/Kconfig b/drivers/ras/amd/atl/Kconfig index a43513a700f1..df49c23e7f62 100644 --- a/drivers/ras/amd/atl/Kconfig +++ b/drivers/ras/amd/atl/Kconfig @@ -10,6 +10,7 @@ config AMD_ATL tristate "AMD Address Translation Library" depends on AMD_NB && X86_64 && RAS + depends on MEMORY_FAILURE default N help This library includes support for implementation-specific 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) diff --git a/include/linux/ras.h b/include/linux/ras.h index 09c632832bf1..a64182bc72ad 100644 --- a/include/linux/ras.h +++ b/include/linux/ras.h @@ -45,8 +45,10 @@ struct atl_err { #if IS_ENABLED(CONFIG_AMD_ATL) void amd_atl_register_decoder(unsigned long (*f)(struct atl_err *)); void amd_atl_unregister_decoder(void); +void amd_retire_dram_row(struct atl_err *err); unsigned long amd_convert_umc_mca_addr_to_sys_addr(struct atl_err *err); #else +static inline void amd_retire_dram_row(struct atl_err *err) { } static inline unsigned long amd_convert_umc_mca_addr_to_sys_addr(struct atl_err *err) { return -EINVAL; } #endif /* CONFIG_AMD_ATL */ |