--- /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_core.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);
Code Review / kvmfornfv.git / blobdiff