Commit c6007e25 authored by Yazen Ghannam's avatar Yazen Ghannam Committed by PrithivishS
Browse files

RAS/AMD/ATL: Add MI300 row retirement support 

mainline inclusion
from mainline-v6.9-rc1
commit 3b566b30b41401888ee0e8eb904a1e7a6693794b
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IAYOV8
CVE: NA

Reference: https://github.com/torvalds/linux/commit/3b566b30b41401888ee0e8eb904a1e7a6693794b



--------------------------------

commit 3b566b30b41401888ee0e8eb904a1e7a6693794b upstream.

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: default avatarYazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240214033516.1344948-2-yazen.ghannam@amd.com


Signed-off-by: default avatarJeevan deep J <j.jeevandeep@amd.com>
Signed-off-by: default avatarPrithivishS <sprithiv@amd.com>
parent 2581766d

drivers/ras/amd/atl/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/ras/amd/atl/umc.c

+51 −0
Original line number Diff line number Diff line
@@ -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)

include/linux/ras.h

+2 −0
Original line number Diff line number Diff line
@@ -68,8 +68,10 @@ 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 */