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authorYazen Ghannam <yazen.ghannam@amd.com>2024-02-13 21:35:15 -0600
committerBorislav Petkov (AMD) <bp@alien8.de>2024-02-14 17:10:06 +0100
commit3b566b30b41401888ee0e8eb904a1e7a6693794b (patch)
tree5e45761649c11d67ad7b4177cce84052afbf446b /drivers/ras
parent0e4fd816b08e85484e4dbe06e91466c85273f8e0 (diff)
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
Diffstat (limited to 'drivers/ras')
-rw-r--r--drivers/ras/amd/atl/Kconfig1
-rw-r--r--drivers/ras/amd/atl/umc.c51
2 files changed, 52 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)