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Commit 58ca9ac1 authored by Tony Luck's avatar Tony Luck Committed by Borislav Petkov
Browse files

EDAC, skx_edac: Detect non-volatile DIMMs 



This just covers the topology function of the EDAC driver. We locate
which DIMM slots are populated with NVDIMMs and query the NFIT and
SMBIOS tables to get the size.

Reviewed-by: default avatarJean Delvare <jdelvare@suse.de>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linux-acpi@vger.kernel.org
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: linux-nvdimm@lists.01.org
Link: http://lkml.kernel.org/r/20180312182430.10335-6-tony.luck@intel.com


Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
parent 6deae96b

drivers/edac/Kconfig

+4 −1
Original line number Diff line number Diff line
@@ -232,9 +232,12 @@ config EDAC_SBRIDGE 
config EDAC_SKX

	tristate "Intel Skylake server Integrated MC"

	depends on PCI && X86_64 && X86_MCE_INTEL && PCI_MMCONFIG

	select DMI

	help

	  Support for error detection and correction the Intel

	  Skylake server Integrated Memory Controllers.

	  Skylake server Integrated Memory Controllers. If your

	  system has non-volatile DIMMs you should also manually

	  select CONFIG_ACPI_NFIT.



config EDAC_PND2

	tristate "Intel Pondicherry2"

drivers/edac/skx_edac.c

+61 −6
Original line number Diff line number Diff line
@@ -14,6 +14,8 @@ 


#include <linux/module.h>

#include <linux/init.h>

#include <linux/acpi.h>

#include <linux/dmi.h>

#include <linux/pci.h>

#include <linux/pci_ids.h>

#include <linux/slab.h>
@@ -24,6 +26,7 @@ 
#include <linux/bitmap.h>

#include <linux/math64.h>

#include <linux/mod_devicetable.h>

#include <acpi/nfit.h>

#include <asm/cpu_device_id.h>

#include <asm/intel-family.h>

#include <asm/processor.h>
@@ -302,6 +305,7 @@ static int get_dimm_attr(u32 reg, int lobit, int hibit, int add, int minval, 
}



#define IS_DIMM_PRESENT(mtr)		GET_BITFIELD((mtr), 15, 15)

#define IS_NVDIMM_PRESENT(mcddrtcfg, i)	GET_BITFIELD((mcddrtcfg), (i), (i))



#define numrank(reg) get_dimm_attr((reg), 12, 13, 0, 0, 2, "ranks")

#define numrow(reg) get_dimm_attr((reg), 2, 4, 12, 1, 6, "rows")
@@ -350,8 +354,6 @@ static int get_dimm_info(u32 mtr, u32 amap, struct dimm_info *dimm, 
	int  banks = 16, ranks, rows, cols, npages;

	u64 size;



	if (!IS_DIMM_PRESENT(mtr))

		return 0;

	ranks = numrank(mtr);

	rows = numrow(mtr);

	cols = numcol(mtr);
@@ -383,6 +385,54 @@ static int get_dimm_info(u32 mtr, u32 amap, struct dimm_info *dimm, 
	return 1;

}



static int get_nvdimm_info(struct dimm_info *dimm, struct skx_imc *imc,

			   int chan, int dimmno)

{

	int smbios_handle;

	u32 dev_handle;

	u16 flags;

	u64 size = 0;



	dev_handle = ACPI_NFIT_BUILD_DEVICE_HANDLE(dimmno, chan, imc->lmc,

						   imc->src_id, 0);



	smbios_handle = nfit_get_smbios_id(dev_handle, &flags);

	if (smbios_handle == -EOPNOTSUPP) {

		pr_warn_once(EDAC_MOD_STR ": Can't find size of NVDIMM. Try enabling CONFIG_ACPI_NFIT\n");

		goto unknown_size;

	}



	if (smbios_handle < 0) {

		skx_printk(KERN_ERR, "Can't find handle for NVDIMM ADR=%x\n", dev_handle);

		goto unknown_size;

	}



	if (flags & ACPI_NFIT_MEM_MAP_FAILED) {

		skx_printk(KERN_ERR, "NVDIMM ADR=%x is not mapped\n", dev_handle);

		goto unknown_size;

	}



	size = dmi_memdev_size(smbios_handle);

	if (size == ~0ull)

		skx_printk(KERN_ERR, "Can't find size for NVDIMM ADR=%x/SMBIOS=%x\n",

			   dev_handle, smbios_handle);



unknown_size:

	dimm->nr_pages = size >> PAGE_SHIFT;

	dimm->grain = 32;

	dimm->dtype = DEV_UNKNOWN;

	dimm->mtype = MEM_NVDIMM;

	dimm->edac_mode = EDAC_SECDED; /* likely better than this */



	edac_dbg(0, "mc#%d: channel %d, dimm %d, %llu Mb (%u pages)\n",

		 imc->mc, chan, dimmno, size >> 20, dimm->nr_pages);



	snprintf(dimm->label, sizeof(dimm->label), "CPU_SrcID#%u_MC#%u_Chan#%u_DIMM#%u",

		 imc->src_id, imc->lmc, chan, dimmno);



	return (size == 0 || size == ~0ull) ? 0 : 1;

}



#define SKX_GET_MTMTR(dev, reg) \

	pci_read_config_dword((dev), 0x87c, &reg)
@@ -399,20 +449,24 @@ static int skx_get_dimm_config(struct mem_ctl_info *mci) 
{

	struct skx_pvt *pvt = mci->pvt_info;

	struct skx_imc *imc = pvt->imc;

	u32 mtr, amap, mcddrtcfg;

	struct dimm_info *dimm;

	int i, j;

	u32 mtr, amap;

	int ndimms;



	for (i = 0; i < NUM_CHANNELS; i++) {

		ndimms = 0;

		pci_read_config_dword(imc->chan[i].cdev, 0x8C, &amap);

		pci_read_config_dword(imc->chan[i].cdev, 0x400, &mcddrtcfg);

		for (j = 0; j < NUM_DIMMS; j++) {

			dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,

					     mci->n_layers, i, j, 0);

			pci_read_config_dword(imc->chan[i].cdev,

					0x80 + 4*j, &mtr);

			if (IS_DIMM_PRESENT(mtr))

				ndimms += get_dimm_info(mtr, amap, dimm, imc, i, j);

			else if (IS_NVDIMM_PRESENT(mcddrtcfg, j))

				ndimms += get_nvdimm_info(dimm, imc, i, j);

		}

		if (ndimms && !skx_check_ecc(imc->chan[0].cdev)) {

			skx_printk(KERN_ERR, "ECC is disabled on imc %d\n", imc->mc);
@@ -468,13 +522,14 @@ static int skx_register_mci(struct skx_imc *imc) 
	pvt = mci->pvt_info;

	pvt->imc = imc;



	mci->ctl_name = kasprintf(GFP_KERNEL, "Skylake Socket#%d IMC#%d", imc->node_id, imc->lmc);

	mci->ctl_name = kasprintf(GFP_KERNEL, "Skylake Socket#%d IMC#%d",

				  imc->node_id, imc->lmc);

	if (!mci->ctl_name) {

		rc = -ENOMEM;

		goto fail0;

	}



	mci->mtype_cap = MEM_FLAG_DDR4;

	mci->mtype_cap = MEM_FLAG_DDR4 | MEM_FLAG_NVDIMM;

	mci->edac_ctl_cap = EDAC_FLAG_NONE;

	mci->edac_cap = EDAC_FLAG_NONE;

	mci->mod_name = EDAC_MOD_STR;