RAS/AMD/ATL: Add MI300 row retirement support

[sfrench/cifs-2.6.git] / drivers / ras / amd / atl / umc.c

diff --git a/drivers/ras/amd/atl/umc.c b/drivers/ras/amd/atl/umc.c
index 7e310d1dfcfc76467d372b64e9c5afc692bdc2e9..08c6dbd44c6226dd430342cbcbd8b3bef8497384 100644 (file)
--- 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)