path: root/drivers/edac/skx_common.c

// SPDX-License-Identifier: GPL-2.0
/*
 *
 * Shared code by both skx_edac and i10nm_edac. Originally split out
 * from the skx_edac driver.
 *
 * This file is linked into both skx_edac and i10nm_edac drivers. In
 * order to avoid link errors, this file must be like a pure library
 * without including symbols and defines which would otherwise conflict,
 * when linked once into a module and into a built-in object, at the
 * same time. For example, __this_module symbol references when that
 * file is being linked into a built-in object.
 *
 * Copyright (c) 2018, Intel Corporation.
 */

#include <linux/topology.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/adxl.h>
#include <linux/overflow.h>
#include <acpi/nfit.h>
#include <asm/mce.h>
#include <asm/uv/uv.h>
#include "edac_module.h"
#include "skx_common.h"

static const char * const component_names[] = {
	[INDEX_SOCKET]		= "ProcessorSocketId",
	[INDEX_MEMCTRL]		= "MemoryControllerId",
	[INDEX_CHANNEL]		= "ChannelId",
	[INDEX_DIMM]		= "DimmSlotId",
	[INDEX_CS]		= "ChipSelect",
	[INDEX_NM_MEMCTRL]	= "NmMemoryControllerId",
	[INDEX_NM_CHANNEL]	= "NmChannelId",
	[INDEX_NM_DIMM]		= "NmDimmSlotId",
	[INDEX_NM_CS]		= "NmChipSelect",
};

static int component_indices[ARRAY_SIZE(component_names)];
static int adxl_component_count;
static const char * const *adxl_component_names;
static u64 *adxl_values;
static char *adxl_msg;
static unsigned long adxl_nm_bitmap;

static char skx_msg[MSG_SIZE];
static skx_decode_f driver_decode;
static skx_show_retry_log_f skx_show_retry_rd_err_log;
static u64 skx_tolm, skx_tohm;
static LIST_HEAD(dev_edac_list);
static bool skx_mem_cfg_2lm;
static struct res_config *skx_res_cfg;

int skx_adxl_get(void)
{
	const char * const *names;
	int i, j;

	names = adxl_get_component_names();
	if (!names) {
		skx_printk(KERN_NOTICE, "No firmware support for address translation.\n");
		return -ENODEV;
	}

	for (i = 0; i < INDEX_MAX; i++) {
		for (j = 0; names[j]; j++) {
			if (!strcmp(component_names[i], names[j])) {
				component_indices[i] = j;

				if (i >= INDEX_NM_FIRST)
					adxl_nm_bitmap |= 1 << i;

				break;
			}
		}

		if (!names[j] && i < INDEX_NM_FIRST)
			goto err;
	}

	if (skx_mem_cfg_2lm) {
		if (!adxl_nm_bitmap)
			skx_printk(KERN_NOTICE, "Not enough ADXL components for 2-level memory.\n");
		else
			edac_dbg(2, "adxl_nm_bitmap: 0x%lx\n", adxl_nm_bitmap);
	}

	adxl_component_names = names;
	while (*names++)
		adxl_component_count++;

	adxl_values = kcalloc(adxl_component_count, sizeof(*adxl_values),
			      GFP_KERNEL);
	if (!adxl_values) {
		adxl_component_count = 0;
		return -ENOMEM;
	}

	adxl_msg = kzalloc(MSG_SIZE, GFP_KERNEL);
	if (!adxl_msg) {
		adxl_component_count = 0;
		kfree(adxl_values);
		return -ENOMEM;
	}

	return 0;
err:
	skx_printk(KERN_ERR, "'%s' is not matched from DSM parameters: ",
		   component_names[i]);
	for (j = 0; names[j]; j++)
		skx_printk(KERN_CONT, "%s ", names[j]);
	skx_printk(KERN_CONT, "\n");

	return -ENODEV;
}
EXPORT_SYMBOL_GPL(skx_adxl_get);

void skx_adxl_put(void)
{
	adxl_component_count = 0;
	kfree(adxl_values);
	kfree(adxl_msg);
}
EXPORT_SYMBOL_GPL(skx_adxl_put);

void skx_init_mc_mapping(struct skx_dev *d)
{
	/*
	 * By default, the BIOS presents all memory controllers within each
	 * socket to the EDAC driver. The physical indices are the same as
	 * the logical indices of the memory controllers enumerated by the
	 * EDAC driver.
	 */
	for (int i = 0; i < d->num_imc; i++)
		d->imc[i].mc_mapping = i;
}
EXPORT_SYMBOL_GPL(skx_init_mc_mapping);

void skx_set_mc_mapping(struct skx_dev *d, u8 pmc, u8 lmc)
{
	edac_dbg(0, "Set the mapping of mc phy idx to logical idx: %02d -> %02d\n",
		 pmc, lmc);

	d->imc[lmc].mc_mapping = pmc;
}
EXPORT_SYMBOL_GPL(skx_set_mc_mapping);

static int skx_get_mc_mapping(struct skx_dev *d, u8 pmc)
{
	for (int lmc = 0; lmc < d->num_imc; lmc++) {
		if (d->imc[lmc].mc_mapping == pmc) {
			edac_dbg(0, "Get the mapping of mc phy idx to logical idx: %02d -> %02d\n",
				 pmc, lmc);

			return lmc;
		}
	}

	return -1;
}

static bool skx_adxl_decode(struct decoded_addr *res, enum error_source err_src)
{
	int i, lmc, len = 0;
	struct