+++ /dev/null
-/*
- * Copyright 2011 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- * Tilera-specific EDAC driver.
- *
- * This source code is derived from the following driver:
- *
- * Cell MIC driver for ECC counting
- *
- * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
- * <benh@kernel.crashing.org>
- *
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-#include <linux/edac.h>
-#include <hv/hypervisor.h>
-#include <hv/drv_mshim_intf.h>
-
-#include "edac_module.h"
-
-#define DRV_NAME "tile-edac"
-
-/* Number of cs_rows needed per memory controller on TILEPro. */
-#define TILE_EDAC_NR_CSROWS 1
-
-/* Number of channels per memory controller on TILEPro. */
-#define TILE_EDAC_NR_CHANS 1
-
-/* Granularity of reported error in bytes on TILEPro. */
-#define TILE_EDAC_ERROR_GRAIN 8
-
-/* TILE processor has multiple independent memory controllers. */
-struct platform_device *mshim_pdev[TILE_MAX_MSHIMS];
-
-struct tile_edac_priv {
- int hv_devhdl; /* Hypervisor device handle. */
- int node; /* Memory controller instance #. */
- unsigned int ce_count; /*
- * Correctable-error counter
- * kept by the driver.
- */
-};
-
-static void tile_edac_check(struct mem_ctl_info *mci)
-{
- struct tile_edac_priv *priv = mci->pvt_info;
- struct mshim_mem_error mem_error;
-
- if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_error,
- sizeof(struct mshim_mem_error), MSHIM_MEM_ERROR_OFF) !=
- sizeof(struct mshim_mem_error)) {
- pr_err(DRV_NAME ": MSHIM_MEM_ERROR_OFF pread failure.\n");
- return;
- }
-
- /* Check if the current error count is different from the saved one. */
- if (mem_error.sbe_count != priv->ce_count) {
- dev_dbg(mci->pdev, "ECC CE err on node %d\n", priv->node);
- priv->ce_count = mem_error.sbe_count;
- edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
- 0, 0, 0,
- 0, 0, -1,
- mci->ctl_name, "");
- }
-}
-
-/*
- * Initialize the 'csrows' table within the mci control structure with the
- * addressing of memory.
- */
-static int tile_edac_init_csrows(struct mem_ctl_info *mci)
-{
- struct csrow_info *csrow = mci->csrows[0];
- struct tile_edac_priv *priv = mci->pvt_info;
- struct mshim_mem_info mem_info;
- struct dimm_info *dimm = csrow->channels[0]->dimm;
-
- if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&mem_info,
- sizeof(struct mshim_mem_info), MSHIM_MEM_INFO_OFF) !=
- sizeof(struct mshim_mem_info)) {
- pr_err(DRV_NAME ": MSHIM_MEM_INFO_OFF pread failure.\n");
- return -1;
- }
-
- if (mem_info.mem_ecc)
- dimm->edac_mode = EDAC_SECDED;
- else
- dimm->edac_mode = EDAC_NONE;
- switch (mem_info.mem_type) {
- case DDR2:
- dimm->mtype = MEM_DDR2;
- break;
-
- case DDR3:
- dimm->mtype = MEM_DDR3;
- break;
-
- default:
- return -1;
- }
-
- dimm->nr_pages = mem_info.mem_size >> PAGE_SHIFT;
- dimm->grain = TILE_EDAC_ERROR_GRAIN;
- dimm->dtype = DEV_UNKNOWN;
-
- return 0;
-}
-
-static int tile_edac_mc_probe(struct platform_device *pdev)
-{
- char hv_file[32];
- int hv_devhdl;
- struct mem_ctl_info *mci;
- struct edac_mc_layer layers[2];
- struct tile_edac_priv *priv;
- int rc;
-
- sprintf(hv_file, "mshim/%d", pdev->id);
- hv_devhdl = hv_dev_open((HV_VirtAddr)hv_file, 0);
- if (hv_devhdl < 0)
- return -EINVAL;
-
- /* A TILE MC has a single channel and one chip-select row. */
- layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
- layers[0].size = TILE_EDAC_NR_CSROWS;
- layers[0].is_virt_csrow = true;
- layers[1].type = EDAC_MC_LAYER_CHANNEL;
- layers[1].size = TILE_EDAC_NR_CHANS;
- layers[1].is_virt_csrow = false;
- mci = edac_mc_alloc(pdev->id, ARRAY_SIZE(layers), layers,
- sizeof(struct tile_edac_priv));
- if (mci == NULL)
- return -ENOMEM;
- priv = mci->pvt_info;
- priv->node = pdev->id;
- priv->hv_devhdl = hv_devhdl;
-
- mci->pdev = &pdev->dev;
- mci->mtype_cap = MEM_FLAG_DDR2;
- mci->edac_ctl_cap = EDAC_FLAG_SECDED;
-
- mci->mod_name = DRV_NAME;
-#ifdef __tilegx__
- mci->ctl_name = "TILEGx_Memory_Controller";
-#else
- mci->ctl_name = "TILEPro_Memory_Controller";
-#endif
- mci->dev_name = dev_name(&pdev->dev);
- mci->edac_check = tile_edac_check;
-
- /*
- * Initialize the MC control structure 'csrows' table
- * with the mapping and control information.
- */
- if (tile_edac_init_csrows(mci)) {
- /* No csrows found. */
- mci->edac_cap = EDAC_FLAG_NONE;
- } else {
- mci->edac_cap = EDAC_FLAG_SECDED;
- }
-
- platform_set_drvdata(pdev, mci);
-
- /* Register with EDAC core */
- rc = edac_mc_add_mc(mci);
- if (rc) {
- dev_err(&pdev->dev, "failed to register with EDAC core\n");
- edac_mc_free(mci);
- return rc;
- }
-
- return 0;
-}
-
-static int tile_edac_mc_remove(struct platform_device *pdev)
-{
- struct mem_ctl_info *mci = platform_get_drvdata(pdev);
-
- edac_mc_del_mc(&pdev->dev);
- if (mci)
- edac_mc_free(mci);
- return 0;
-}
-
-static struct platform_driver tile_edac_mc_driver = {
- .driver = {
- .name = DRV_NAME,
- },
- .probe = tile_edac_mc_probe,
- .remove = tile_edac_mc_remove,
-};
-
-/*
- * Driver init routine.
- */
-static int __init tile_edac_init(void)
-{
- char hv_file[32];
- struct platform_device *pdev;
- int i, err, num = 0;
-
- /* Only support POLL mode. */
- edac_op_state = EDAC_OPSTATE_POLL;
-
- err = platform_driver_register(&tile_edac_mc_driver);
- if (err)
- return err;
-
- for (i = 0; i < TILE_MAX_MSHIMS; i++) {
- /*
- * Not all memory controllers are configured such as in the
- * case of a simulator. So we register only those mshims
- * that are configured by the hypervisor.
- */
- sprintf(hv_file, "mshim/%d", i);
- if (hv_dev_open((HV_VirtAddr)hv_file, 0) < 0)
- continue;
-
- pdev = platform_device_register_simple(DRV_NAME, i, NULL, 0);
- if (IS_ERR(pdev))
- continue;
- mshim_pdev[i] = pdev;
- num++;
- }
-
- if (num == 0) {
- platform_driver_unregister(&tile_edac_mc_driver);
- return -ENODEV;
- }
- return 0;
-}
-
-/*
- * Driver cleanup routine.
- */
-static void __exit tile_edac_exit(void)
-{
- int i;
-
- for (i = 0; i < TILE_MAX_MSHIMS; i++) {
- struct platform_device *pdev = mshim_pdev[i];
- if (!pdev)
- continue;
-
- platform_device_unregister(pdev);
- }
- platform_driver_unregister(&tile_edac_mc_driver);
-}
-
-module_init(tile_edac_init);
-module_exit(tile_edac_exit);
projects / mirror_ubuntu-jammy-kernel.git / commitdiff