xref: /linux/drivers/mmc/core/debugfs.c (revision 8b06f7538a1bb6ad15969114e31be7a99420125b)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Debugfs support for hosts and cards
4  *
5  * Copyright (C) 2008 Atmel Corporation
6  */
7 #include <linux/moduleparam.h>
8 #include <linux/export.h>
9 #include <linux/debugfs.h>
10 #include <linux/fs.h>
11 #include <linux/seq_file.h>
12 #include <linux/slab.h>
13 #include <linux/stat.h>
14 #include <linux/fault-inject.h>
15 #include <linux/time.h>
16 
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/host.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sd.h>
21 
22 #include "core.h"
23 #include "card.h"
24 #include "host.h"
25 #include "mmc_ops.h"
26 
27 #ifdef CONFIG_FAIL_MMC_REQUEST
28 
29 static DECLARE_FAULT_ATTR(fail_default_attr);
30 static char *fail_request;
31 module_param(fail_request, charp, 0);
32 MODULE_PARM_DESC(fail_request, "default fault injection attributes");
33 
34 #endif /* CONFIG_FAIL_MMC_REQUEST */
35 
36 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
mmc_ios_show(struct seq_file * s,void * data)37 static int mmc_ios_show(struct seq_file *s, void *data)
38 {
39 	static const char *vdd_str[] = {
40 		[8]	= "2.0",
41 		[9]	= "2.1",
42 		[10]	= "2.2",
43 		[11]	= "2.3",
44 		[12]	= "2.4",
45 		[13]	= "2.5",
46 		[14]	= "2.6",
47 		[15]	= "2.7",
48 		[16]	= "2.8",
49 		[17]	= "2.9",
50 		[18]	= "3.0",
51 		[19]	= "3.1",
52 		[20]	= "3.2",
53 		[21]	= "3.3",
54 		[22]	= "3.4",
55 		[23]	= "3.5",
56 		[24]	= "3.6",
57 	};
58 	struct mmc_host	*host = s->private;
59 	struct mmc_ios	*ios = &host->ios;
60 	const char *str;
61 
62 	seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
63 	if (host->actual_clock)
64 		seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
65 	seq_printf(s, "vdd:\t\t%u ", ios->vdd);
66 	if ((1 << ios->vdd) & MMC_VDD_165_195)
67 		seq_printf(s, "(1.65 - 1.95 V)\n");
68 	else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
69 			&& vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
70 		seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
71 				vdd_str[ios->vdd + 1]);
72 	else
73 		seq_printf(s, "(invalid)\n");
74 
75 	switch (ios->bus_mode) {
76 	case MMC_BUSMODE_OPENDRAIN:
77 		str = "open drain";
78 		break;
79 	case MMC_BUSMODE_PUSHPULL:
80 		str = "push-pull";
81 		break;
82 	default:
83 		str = "invalid";
84 		break;
85 	}
86 	seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
87 
88 	switch (ios->chip_select) {
89 	case MMC_CS_DONTCARE:
90 		str = "don't care";
91 		break;
92 	case MMC_CS_HIGH:
93 		str = "active high";
94 		break;
95 	case MMC_CS_LOW:
96 		str = "active low";
97 		break;
98 	default:
99 		str = "invalid";
100 		break;
101 	}
102 	seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
103 
104 	switch (ios->power_mode) {
105 	case MMC_POWER_OFF:
106 		str = "off";
107 		break;
108 	case MMC_POWER_UP:
109 		str = "up";
110 		break;
111 	case MMC_POWER_ON:
112 		str = "on";
113 		break;
114 	default:
115 		str = "invalid";
116 		break;
117 	}
118 	seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
119 	seq_printf(s, "bus width:\t%u (%u bits)\n",
120 			ios->bus_width, 1 << ios->bus_width);
121 
122 	switch (ios->timing) {
123 	case MMC_TIMING_LEGACY:
124 		str = "legacy";
125 		break;
126 	case MMC_TIMING_MMC_HS:
127 		str = "mmc high-speed";
128 		break;
129 	case MMC_TIMING_SD_HS:
130 		str = "sd high-speed";
131 		break;
132 	case MMC_TIMING_UHS_SDR12:
133 		str = "sd uhs SDR12";
134 		break;
135 	case MMC_TIMING_UHS_SDR25:
136 		str = "sd uhs SDR25";
137 		break;
138 	case MMC_TIMING_UHS_SDR50:
139 		str = "sd uhs SDR50";
140 		break;
141 	case MMC_TIMING_UHS_SDR104:
142 		str = "sd uhs SDR104";
143 		break;
144 	case MMC_TIMING_UHS_DDR50:
145 		str = "sd uhs DDR50";
146 		break;
147 	case MMC_TIMING_MMC_DDR52:
148 		str = "mmc DDR52";
149 		break;
150 	case MMC_TIMING_MMC_HS200:
151 		str = "mmc HS200";
152 		break;
153 	case MMC_TIMING_MMC_HS400:
154 		str = mmc_card_hs400es(host->card) ?
155 			"mmc HS400 enhanced strobe" : "mmc HS400";
156 		break;
157 	default:
158 		str = "invalid";
159 		break;
160 	}
161 	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
162 
163 	switch (ios->signal_voltage) {
164 	case MMC_SIGNAL_VOLTAGE_330:
165 		str = "3.30 V";
166 		break;
167 	case MMC_SIGNAL_VOLTAGE_180:
168 		str = "1.80 V";
169 		break;
170 	case MMC_SIGNAL_VOLTAGE_120:
171 		str = "1.20 V";
172 		break;
173 	default:
174 		str = "invalid";
175 		break;
176 	}
177 	seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
178 
179 	switch (ios->drv_type) {
180 	case MMC_SET_DRIVER_TYPE_A:
181 		str = "driver type A";
182 		break;
183 	case MMC_SET_DRIVER_TYPE_B:
184 		str = "driver type B";
185 		break;
186 	case MMC_SET_DRIVER_TYPE_C:
187 		str = "driver type C";
188 		break;
189 	case MMC_SET_DRIVER_TYPE_D:
190 		str = "driver type D";
191 		break;
192 	default:
193 		str = "invalid";
194 		break;
195 	}
196 	seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
197 
198 	return 0;
199 }
200 DEFINE_SHOW_ATTRIBUTE(mmc_ios);
201 
mmc_clock_opt_get(void * data,u64 * val)202 static int mmc_clock_opt_get(void *data, u64 *val)
203 {
204 	struct mmc_host *host = data;
205 
206 	*val = host->ios.clock;
207 
208 	return 0;
209 }
210 
mmc_clock_opt_set(void * data,u64 val)211 static int mmc_clock_opt_set(void *data, u64 val)
212 {
213 	struct mmc_host *host = data;
214 
215 	/* We need this check due to input value is u64 */
216 	if (val != 0 && (val > host->f_max || val < host->f_min))
217 		return -EINVAL;
218 
219 	mmc_claim_host(host);
220 	mmc_set_clock(host, (unsigned int) val);
221 	mmc_release_host(host);
222 
223 	return 0;
224 }
225 
226 DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
227 	"%llu\n");
228 
mmc_err_state_get(void * data,u64 * val)229 static int mmc_err_state_get(void *data, u64 *val)
230 {
231 	struct mmc_host *host = data;
232 	int i;
233 
234 	if (!host)
235 		return -EINVAL;
236 
237 	*val = 0;
238 	for (i = 0; i < MMC_ERR_MAX; i++) {
239 		if (host->err_stats[i]) {
240 			*val = 1;
241 			break;
242 		}
243 	}
244 
245 	return 0;
246 }
247 
248 DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
249 
mmc_err_stats_show(struct seq_file * file,void * data)250 static int mmc_err_stats_show(struct seq_file *file, void *data)
251 {
252 	struct mmc_host *host = file->private;
253 	const char *desc[MMC_ERR_MAX] = {
254 		[MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",
255 		[MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred",
256 		[MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred",
257 		[MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred",
258 		[MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred",
259 		[MMC_ERR_ADMA] = "ADMA Error Occurred",
260 		[MMC_ERR_TUNING] = "Tuning Error Occurred",
261 		[MMC_ERR_CMDQ_RED] = "CMDQ RED Errors",
262 		[MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors",
263 		[MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors",
264 		[MMC_ERR_REQ_TIMEOUT] = "Request Timedout",
265 		[MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout",
266 		[MMC_ERR_ICE_CFG] = "ICE Config Errors",
267 		[MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors",
268 		[MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors",
269 	};
270 	int i;
271 
272 	for (i = 0; i < MMC_ERR_MAX; i++) {
273 		if (desc[i])
274 			seq_printf(file, "# %s:\t %d\n",
275 					desc[i], host->err_stats[i]);
276 	}
277 
278 	return 0;
279 }
280 
mmc_err_stats_open(struct inode * inode,struct file * file)281 static int mmc_err_stats_open(struct inode *inode, struct file *file)
282 {
283 	return single_open(file, mmc_err_stats_show, inode->i_private);
284 }
285 
mmc_err_stats_write(struct file * filp,const char __user * ubuf,size_t cnt,loff_t * ppos)286 static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf,
287 				   size_t cnt, loff_t *ppos)
288 {
289 	struct mmc_host *host = filp->f_mapping->host->i_private;
290 
291 	pr_debug("%s: Resetting MMC error statistics\n", __func__);
292 	memset(host->err_stats, 0, sizeof(host->err_stats));
293 
294 	return cnt;
295 }
296 
297 static const struct file_operations mmc_err_stats_fops = {
298 	.open	= mmc_err_stats_open,
299 	.read	= seq_read,
300 	.write	= mmc_err_stats_write,
301 	.release = single_release,
302 };
303 
mmc_caps_get(void * data,u64 * val)304 static int mmc_caps_get(void *data, u64 *val)
305 {
306 	*val = *(u32 *)data;
307 	return 0;
308 }
309 
mmc_caps_set(void * data,u64 val)310 static int mmc_caps_set(void *data, u64 val)
311 {
312 	u32 *caps = data;
313 	u32 diff = *caps ^ val;
314 	u32 allowed = MMC_CAP_AGGRESSIVE_PM |
315 		      MMC_CAP_SD_HIGHSPEED |
316 		      MMC_CAP_MMC_HIGHSPEED |
317 		      MMC_CAP_UHS |
318 		      MMC_CAP_DDR;
319 
320 	if (diff & ~allowed)
321 		return -EINVAL;
322 
323 	*caps = val;
324 
325 	return 0;
326 }
327 
mmc_caps2_set(void * data,u64 val)328 static int mmc_caps2_set(void *data, u64 val)
329 {
330 	u32 allowed = MMC_CAP2_HSX00_1_8V | MMC_CAP2_HSX00_1_2V;
331 	u32 *caps = data;
332 	u32 diff = *caps ^ val;
333 
334 	if (diff & ~allowed)
335 		return -EINVAL;
336 
337 	*caps = val;
338 
339 	return 0;
340 }
341 
342 DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps_fops, mmc_caps_get, mmc_caps_set,
343 			 "0x%08llx\n");
344 DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps2_fops, mmc_caps_get, mmc_caps2_set,
345 			 "0x%08llx\n");
346 
mmc_add_host_debugfs(struct mmc_host * host)347 void mmc_add_host_debugfs(struct mmc_host *host)
348 {
349 	struct dentry *root;
350 
351 	root = debugfs_create_dir(mmc_hostname(host), NULL);
352 	host->debugfs_root = root;
353 
354 	debugfs_create_file("ios", 0400, root, host, &mmc_ios_fops);
355 	debugfs_create_file("caps", 0600, root, &host->caps, &mmc_caps_fops);
356 	debugfs_create_file("caps2", 0600, root, &host->caps2,
357 			    &mmc_caps2_fops);
358 	debugfs_create_file_unsafe("clock", 0600, root, host,
359 				   &mmc_clock_fops);
360 
361 	debugfs_create_file_unsafe("err_state", 0600, root, host,
362 			    &mmc_err_state);
363 	debugfs_create_file("err_stats", 0600, root, host,
364 			    &mmc_err_stats_fops);
365 
366 #ifdef CONFIG_FAIL_MMC_REQUEST
367 	if (fail_request)
368 		setup_fault_attr(&fail_default_attr, fail_request);
369 	host->fail_mmc_request = fail_default_attr;
370 	fault_create_debugfs_attr("fail_mmc_request", root,
371 				  &host->fail_mmc_request);
372 #endif
373 }
374 
mmc_remove_host_debugfs(struct mmc_host * host)375 void mmc_remove_host_debugfs(struct mmc_host *host)
376 {
377 	debugfs_remove_recursive(host->debugfs_root);
378 }
379 
mmc_add_card_debugfs(struct mmc_card * card)380 void mmc_add_card_debugfs(struct mmc_card *card)
381 {
382 	struct mmc_host	*host = card->host;
383 	struct dentry	*root;
384 
385 	if (!host->debugfs_root)
386 		return;
387 
388 	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
389 	card->debugfs_root = root;
390 
391 	debugfs_create_x32("state", 0400, root, &card->state);
392 	debugfs_create_x32("quirks", 0400, root, &card->quirks);
393 }
394 
mmc_remove_card_debugfs(struct mmc_card * card)395 void mmc_remove_card_debugfs(struct mmc_card *card)
396 {
397 	debugfs_remove_recursive(card->debugfs_root);
398 	card->debugfs_root = NULL;
399 }
400