drivers/edac/tile_edac.c - arm/linux - Git at Google

 /*
  * 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);
	/*
	* 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);