aboutsummaryrefslogtreecommitdiff
path: root/drivers/edac/tile_edac.c
blob: 604bc4df653a2f8bab15fe782f4cd35d8aa3f74f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/*
 * 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,
				     0, 0, 0,
				     0, 0, -1,
				     mci->ctl_name, "", NULL);
	}
}

/*
 * Initialize the 'csrows' table within the mci control structure with the
 * addressing of memory.
 */
static int __devinit 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 __devinit 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 __devexit 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,
		.owner	= THIS_MODULE,
	},
	.probe		= tile_edac_mc_probe,
	.remove		= __devexit_p(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_set_drvdata(pdev, NULL);
		platform_device_unregister(pdev);
	}
	platform_driver_unregister(&tile_edac_mc_driver);
}

module_init(tile_edac_init);
module_exit(tile_edac_exit);