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Commit 32fa1f53 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

ghes_edac: do a better job of filling EDAC DIMM info 



Instead of just faking a random value for the DIMM data, get
the information that it is available via DMI table.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent f04c62a7

drivers/edac/ghes_edac.c

+180 −12
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 


#include <acpi/ghes.h>

#include <linux/edac.h>

#include <linux/dmi.h>

#include "edac_core.h"



#define GHES_PFX   "ghes_edac: "
@@ -26,6 +27,155 @@ static LIST_HEAD(ghes_reglist); 
static DEFINE_MUTEX(ghes_edac_lock);

static int ghes_edac_mc_num;



/* Memory Device - Type 17 of SMBIOS spec */

struct memdev_dmi_entry {

	u8 type;

	u8 length;

	u16 handle;

	u16 phys_mem_array_handle;

	u16 mem_err_info_handle;

	u16 total_width;

	u16 data_width;

	u16 size;

	u8 form_factor;

	u8 device_set;

	u8 device_locator;

	u8 bank_locator;

	u8 memory_type;

	u16 type_detail;

	u16 speed;

	u8 manufacturer;

	u8 serial_number;

	u8 asset_tag;

	u8 part_number;

	u8 attributes;

	u32 extended_size;

	u16 conf_mem_clk_speed;

} __attribute__((__packed__));



struct ghes_edac_dimm_fill {

	struct mem_ctl_info *mci;

	unsigned count;

};



char *memory_type[] = {

	[MEM_EMPTY] = "EMPTY",

	[MEM_RESERVED] = "RESERVED",

	[MEM_UNKNOWN] = "UNKNOWN",

	[MEM_FPM] = "FPM",

	[MEM_EDO] = "EDO",

	[MEM_BEDO] = "BEDO",

	[MEM_SDR] = "SDR",

	[MEM_RDR] = "RDR",

	[MEM_DDR] = "DDR",

	[MEM_RDDR] = "RDDR",

	[MEM_RMBS] = "RMBS",

	[MEM_DDR2] = "DDR2",

	[MEM_FB_DDR2] = "FB_DDR2",

	[MEM_RDDR2] = "RDDR2",

	[MEM_XDR] = "XDR",

	[MEM_DDR3] = "DDR3",

	[MEM_RDDR3] = "RDDR3",

};



static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg)

{

	int *num_dimm = arg;



	if (dh->type == DMI_ENTRY_MEM_DEVICE)

		(*num_dimm)++;

}



static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)

{

	struct ghes_edac_dimm_fill *dimm_fill = arg;

	struct mem_ctl_info *mci = dimm_fill->mci;



	if (dh->type == DMI_ENTRY_MEM_DEVICE) {

		struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh;

		struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,

						       mci->n_layers,

						       dimm_fill->count, 0, 0);



		if (entry->size == 0xffff) {

			pr_info(GHES_PFX "Can't get dimm size\n");

			dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */

		} else if (entry->size == 0x7fff) {

			dimm->nr_pages = MiB_TO_PAGES(entry->extended_size);

		} else {

			if (entry->size & 1 << 15)

				dimm->nr_pages = MiB_TO_PAGES((entry->size &

							       0x7fff) << 10);

			else

				dimm->nr_pages = MiB_TO_PAGES(entry->size);

		}



		switch (entry->memory_type) {

		case 0x12:

			if (entry->type_detail & 1 << 13)

				dimm->mtype = MEM_RDDR;

			else

				dimm->mtype = MEM_DDR;

			break;

		case 0x13:

			if (entry->type_detail & 1 << 13)

				dimm->mtype = MEM_RDDR2;

			else

				dimm->mtype = MEM_DDR2;

			break;

		case 0x14:

			dimm->mtype = MEM_FB_DDR2;

			break;

		case 0x18:

			if (entry->type_detail & 1 << 13)

				dimm->mtype = MEM_RDDR3;

			else

				dimm->mtype = MEM_DDR3;

			break;

		default:

			if (entry->type_detail & 1 << 6)

				dimm->mtype = MEM_RMBS;

			else if ((entry->type_detail & ((1 << 7) | (1 << 13)))

				 == ((1 << 7) | (1 << 13)))

				dimm->mtype = MEM_RDR;

			else if (entry->type_detail & 1 << 7)

				dimm->mtype = MEM_SDR;

			else if (entry->type_detail & 1 << 9)

				dimm->mtype = MEM_EDO;

			else

				dimm->mtype = MEM_UNKNOWN;

		}



		/*

		 * Actually, we can only detect if the memory has bits for

		 * checksum or not

		 */

		if (entry->total_width == entry->data_width)

			dimm->edac_mode = EDAC_NONE;

		else

			dimm->edac_mode = EDAC_SECDED;



		dimm->dtype = DEV_UNKNOWN;

		dimm->grain = 128;		/* Likely, worse case */



		/*

		 * FIXME: It shouldn't be hard to also fill the DIMM labels

		 */



		if (dimm->nr_pages) {

			pr_info(GHES_PFX "DIMM%i: %s size = %d MB%s\n",

				dimm_fill->count, memory_type[dimm->mtype],

				PAGES_TO_MiB(dimm->nr_pages),

				(dimm->edac_mode != EDAC_NONE) ? "(ECC)" : "");

			pr_info(GHES_PFX "\ttype %d, detail 0x%02x, width %d(total %d)\n",

				entry->memory_type, entry->type_detail,

				entry->total_width, entry->data_width);

		}



		dimm_fill->count++;

	}

}



void ghes_edac_report_mem_error(struct ghes *ghes, int sev,

				struct cper_sec_mem_err *mem_err)

{
@@ -86,15 +236,24 @@ EXPORT_SYMBOL_GPL(ghes_edac_report_mem_error); 


int ghes_edac_register(struct ghes *ghes, struct device *dev)

{

	int rc;

	bool fake = false;

	int rc, num_dimm = 0;

	struct mem_ctl_info *mci;

	struct edac_mc_layer layers[1];

	struct csrow_info *csrow;

	struct dimm_info *dimm;

	struct ghes_edac_pvt *pvt;

	struct ghes_edac_dimm_fill dimm_fill;



	/* Get the number of DIMMs */

	dmi_walk(ghes_edac_count_dimms, &num_dimm);



	/* Check if we've got a bogus BIOS */

	if (num_dimm == 0) {

		fake = true;

		num_dimm = 1;

	}



	layers[0].type = EDAC_MC_LAYER_ALL_MEM;

	layers[0].size = 1;

	layers[0].size = num_dimm;

	layers[0].is_virt_csrow = true;



	/*
@@ -102,6 +261,8 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) 
	 * to avoid duplicated memory controller numbers

	 */

	mutex_lock(&ghes_edac_lock);

	pr_info("ghes_edac#%d: allocating space for %d dimms\n",

		ghes_edac_mc_num, num_dimm);

	mci = edac_mc_alloc(ghes_edac_mc_num, ARRAY_SIZE(layers), layers,

			    sizeof(*pvt));

	if (!mci) {
@@ -125,15 +286,22 @@ int ghes_edac_register(struct ghes *ghes, struct device *dev) 
	mci->ctl_name = "ghes_edac";

	mci->dev_name = "ghes";



	csrow = mci->csrows[0];

	dimm = csrow->channels[0]->dimm;

	if (!fake) {

		/* Fill DIMM info from DMI */

		dimm_fill.count = 0;

		dimm_fill.mci = mci;

		dmi_walk(ghes_edac_dmidecode, &dimm_fill);

	} else {

		struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,

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



	/* FIXME: FAKE DATA */

		pr_info(GHES_PFX "Crappy BIOS detected. Faking DIMM EDAC data\n");

		dimm->nr_pages = 1000;

		dimm->grain = 128;

		dimm->mtype = MEM_UNKNOWN;

		dimm->dtype = DEV_UNKNOWN;

		dimm->edac_mode = EDAC_SECDED;

	}



	rc = edac_mc_add_mc(mci);

	if (rc < 0) {