cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

highbank_l2_edac.c (3484B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2011-2012 Calxeda, Inc.
      4 */
      5#include <linux/types.h>
      6#include <linux/kernel.h>
      7#include <linux/ctype.h>
      8#include <linux/edac.h>
      9#include <linux/interrupt.h>
     10#include <linux/platform_device.h>
     11#include <linux/of_platform.h>
     12
     13#include "edac_module.h"
     14
     15#define SR_CLR_SB_ECC_INTR	0x0
     16#define SR_CLR_DB_ECC_INTR	0x4
     17
     18struct hb_l2_drvdata {
     19	void __iomem *base;
     20	int sb_irq;
     21	int db_irq;
     22};
     23
     24static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
     25{
     26	struct edac_device_ctl_info *dci = dev_id;
     27	struct hb_l2_drvdata *drvdata = dci->pvt_info;
     28
     29	if (irq == drvdata->sb_irq) {
     30		writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
     31		edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
     32	}
     33	if (irq == drvdata->db_irq) {
     34		writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
     35		edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
     36	}
     37
     38	return IRQ_HANDLED;
     39}
     40
     41static const struct of_device_id hb_l2_err_of_match[] = {
     42	{ .compatible = "calxeda,hb-sregs-l2-ecc", },
     43	{},
     44};
     45MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);
     46
     47static int highbank_l2_err_probe(struct platform_device *pdev)
     48{
     49	const struct of_device_id *id;
     50	struct edac_device_ctl_info *dci;
     51	struct hb_l2_drvdata *drvdata;
     52	struct resource *r;
     53	int res = 0;
     54
     55	dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
     56		1, "L", 1, 2, NULL, 0, 0);
     57	if (!dci)
     58		return -ENOMEM;
     59
     60	drvdata = dci->pvt_info;
     61	dci->dev = &pdev->dev;
     62	platform_set_drvdata(pdev, dci);
     63
     64	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
     65		return -ENOMEM;
     66
     67	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     68	if (!r) {
     69		dev_err(&pdev->dev, "Unable to get mem resource\n");
     70		res = -ENODEV;
     71		goto err;
     72	}
     73
     74	if (!devm_request_mem_region(&pdev->dev, r->start,
     75				     resource_size(r), dev_name(&pdev->dev))) {
     76		dev_err(&pdev->dev, "Error while requesting mem region\n");
     77		res = -EBUSY;
     78		goto err;
     79	}
     80
     81	drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
     82	if (!drvdata->base) {
     83		dev_err(&pdev->dev, "Unable to map regs\n");
     84		res = -ENOMEM;
     85		goto err;
     86	}
     87
     88	id = of_match_device(hb_l2_err_of_match, &pdev->dev);
     89	dci->mod_name = pdev->dev.driver->name;
     90	dci->ctl_name = id ? id->compatible : "unknown";
     91	dci->dev_name = dev_name(&pdev->dev);
     92
     93	if (edac_device_add_device(dci))
     94		goto err;
     95
     96	drvdata->db_irq = platform_get_irq(pdev, 0);
     97	res = devm_request_irq(&pdev->dev, drvdata->db_irq,
     98			       highbank_l2_err_handler,
     99			       0, dev_name(&pdev->dev), dci);
    100	if (res < 0)
    101		goto err2;
    102
    103	drvdata->sb_irq = platform_get_irq(pdev, 1);
    104	res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
    105			       highbank_l2_err_handler,
    106			       0, dev_name(&pdev->dev), dci);
    107	if (res < 0)
    108		goto err2;
    109
    110	devres_close_group(&pdev->dev, NULL);
    111	return 0;
    112err2:
    113	edac_device_del_device(&pdev->dev);
    114err:
    115	devres_release_group(&pdev->dev, NULL);
    116	edac_device_free_ctl_info(dci);
    117	return res;
    118}
    119
    120static int highbank_l2_err_remove(struct platform_device *pdev)
    121{
    122	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
    123
    124	edac_device_del_device(&pdev->dev);
    125	edac_device_free_ctl_info(dci);
    126	return 0;
    127}
    128
    129static struct platform_driver highbank_l2_edac_driver = {
    130	.probe = highbank_l2_err_probe,
    131	.remove = highbank_l2_err_remove,
    132	.driver = {
    133		.name = "hb_l2_edac",
    134		.of_match_table = hb_l2_err_of_match,
    135	},
    136};
    137
    138module_platform_driver(highbank_l2_edac_driver);
    139
    140MODULE_LICENSE("GPL v2");
    141MODULE_AUTHOR("Calxeda, Inc.");
    142MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");