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RAS/AMD/ATL: Add MI300 row retirement support

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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
This commit is contained in:
Yazen Ghannam 2024-02-13 21:35:15 -06:00 • committed by Borislav Petkov (AMD)
parent 0e4fd816b0
commit 3b566b30b4
3 changed files with 54 additions and 0 deletions
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1
drivers/ras/amd/atl/Kconfig
View file

@ -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

51
drivers/ras/amd/atl/umc.c
View file

@ -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)

2
include/linux/ras.h
View file

@ -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 */