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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Performance Limit Reasons via TPMI
4 *
5 * Copyright (c) 2024, Intel Corporation.
6 */
7
8#include <linux/array_size.h>
9#include <linux/auxiliary_bus.h>
10#include <linux/bitfield.h>
11#include <linux/bitmap.h>
12#include <linux/debugfs.h>
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/gfp_types.h>
16#include <linux/intel_tpmi.h>
17#include <linux/io.h>
18#include <linux/iopoll.h>
19#include <linux/kstrtox.h>
20#include <linux/lockdep.h>
21#include <linux/module.h>
22#include <linux/mod_devicetable.h>
23#include <linux/mutex.h>
24#include <linux/seq_file.h>
25#include <linux/sprintf.h>
26#include <linux/types.h>
27
28#include "tpmi_power_domains.h"
29
30#define PLR_HEADER 0x00
31#define PLR_MAILBOX_INTERFACE 0x08
32#define PLR_MAILBOX_DATA 0x10
33#define PLR_DIE_LEVEL 0x18
34
35#define PLR_MODULE_ID_MASK GENMASK_ULL(19, 12)
36#define PLR_RUN_BUSY BIT_ULL(63)
37
38#define PLR_COMMAND_WRITE 1
39
40#define PLR_INVALID GENMASK_ULL(63, 0)
41
42#define PLR_TIMEOUT_US 5
43#define PLR_TIMEOUT_MAX_US 1000
44
45#define PLR_COARSE_REASON_BITS 32
46
47struct tpmi_plr;
48
49struct tpmi_plr_die {
50 void __iomem *base;
51 struct mutex lock; /* Protect access to PLR mailbox */
52 int package_id;
53 int die_id;
54 struct tpmi_plr *plr;
55};
56
57struct tpmi_plr {
58 struct dentry *dbgfs_dir;
59 struct tpmi_plr_die *die_info;
60 int num_dies;
61 struct auxiliary_device *auxdev;
62};
63
64static const char * const plr_coarse_reasons[] = {
65 "FREQUENCY",
66 "CURRENT",
67 "POWER",
68 "THERMAL",
69 "PLATFORM",
70 "MCP",
71 "RAS",
72 "MISC",
73 "QOS",
74 "DFC",
75};
76
77static const char * const plr_fine_reasons[] = {
78 "FREQUENCY_CDYN0",
79 "FREQUENCY_CDYN1",
80 "FREQUENCY_CDYN2",
81 "FREQUENCY_CDYN3",
82 "FREQUENCY_CDYN4",
83 "FREQUENCY_CDYN5",
84 "FREQUENCY_FCT",
85 "FREQUENCY_PCS_TRL",
86 "CURRENT_MTPMAX",
87 "POWER_FAST_RAPL",
88 "POWER_PKG_PL1_MSR_TPMI",
89 "POWER_PKG_PL1_MMIO",
90 "POWER_PKG_PL1_PCS",
91 "POWER_PKG_PL2_MSR_TPMI",
92 "POWER_PKG_PL2_MMIO",
93 "POWER_PKG_PL2_PCS",
94 "POWER_PLATFORM_PL1_MSR_TPMI",
95 "POWER_PLATFORM_PL1_MMIO",
96 "POWER_PLATFORM_PL1_PCS",
97 "POWER_PLATFORM_PL2_MSR_TPMI",
98 "POWER_PLATFORM_PL2_MMIO",
99 "POWER_PLATFORM_PL2_PCS",
100 "UNKNOWN(22)",
101 "THERMAL_PER_CORE",
102 "DFC_UFS",
103 "PLATFORM_PROCHOT",
104 "PLATFORM_HOT_VR",
105 "UNKNOWN(27)",
106 "UNKNOWN(28)",
107 "MISC_PCS_PSTATE",
108};
109
110static u64 plr_read(struct tpmi_plr_die *plr_die, int offset)
111{
112 return readq(plr_die->base + offset);
113}
114
115static void plr_write(u64 val, struct tpmi_plr_die *plr_die, int offset)
116{
117 writeq(val, plr_die->base + offset);
118}
119
120static int plr_read_cpu_status(struct tpmi_plr_die *plr_die, int cpu,
121 u64 *status)
122{
123 u64 regval;
124 int ret;
125
126 lockdep_assert_held(&plr_die->lock);
127
128 regval = FIELD_PREP(PLR_MODULE_ID_MASK, tpmi_get_punit_core_number(cpu));
129 regval |= PLR_RUN_BUSY;
130
131 plr_write(regval, plr_die, PLR_MAILBOX_INTERFACE);
132
133 ret = readq_poll_timeout(plr_die->base + PLR_MAILBOX_INTERFACE, regval,
134 !(regval & PLR_RUN_BUSY), PLR_TIMEOUT_US,
135 PLR_TIMEOUT_MAX_US);
136 if (ret)
137 return ret;
138
139 *status = plr_read(plr_die, PLR_MAILBOX_DATA);
140
141 return 0;
142}
143
144static int plr_clear_cpu_status(struct tpmi_plr_die *plr_die, int cpu)
145{
146 u64 regval;
147
148 lockdep_assert_held(&plr_die->lock);
149
150 regval = FIELD_PREP(PLR_MODULE_ID_MASK, tpmi_get_punit_core_number(cpu));
151 regval |= PLR_RUN_BUSY | PLR_COMMAND_WRITE;
152
153 plr_write(0, plr_die, PLR_MAILBOX_DATA);
154
155 plr_write(regval, plr_die, PLR_MAILBOX_INTERFACE);
156
157 return readq_poll_timeout(plr_die->base + PLR_MAILBOX_INTERFACE, regval,
158 !(regval & PLR_RUN_BUSY), PLR_TIMEOUT_US,
159 PLR_TIMEOUT_MAX_US);
160}
161
162static void plr_print_bits(struct seq_file *s, u64 val, int bits)
163{
164 const unsigned long mask[] = { BITMAP_FROM_U64(val) };
165 int bit, index;
166
167 for_each_set_bit(bit, mask, bits) {
168 const char *str = NULL;
169
170 if (bit < PLR_COARSE_REASON_BITS) {
171 if (bit < ARRAY_SIZE(plr_coarse_reasons))
172 str = plr_coarse_reasons[bit];
173 } else {
174 index = bit - PLR_COARSE_REASON_BITS;
175 if (index < ARRAY_SIZE(plr_fine_reasons))
176 str = plr_fine_reasons[index];
177 }
178
179 if (str)
180 seq_printf(s, " %s", str);
181 else
182 seq_printf(s, " UNKNOWN(%d)", bit);
183 }
184
185 if (!val)
186 seq_puts(s, " none");
187
188 seq_putc(s, '\n');
189}
190
191static int plr_status_show(struct seq_file *s, void *unused)
192{
193 struct tpmi_plr_die *plr_die = s->private;
194 int ret;
195 u64 val;
196
197 val = plr_read(plr_die, PLR_DIE_LEVEL);
198 seq_puts(s, "cpus");
199 plr_print_bits(s, val, 32);
200
201 guard(mutex)(&plr_die->lock);
202
203 for (int cpu = 0; cpu < nr_cpu_ids; cpu++) {
204 if (plr_die->die_id != tpmi_get_power_domain_id(cpu))
205 continue;
206
207 if (plr_die->package_id != topology_physical_package_id(cpu))
208 continue;
209
210 seq_printf(s, "cpu%d", cpu);
211 ret = plr_read_cpu_status(plr_die, cpu, &val);
212 if (ret) {
213 dev_err(&plr_die->plr->auxdev->dev, "Failed to read PLR for cpu %d, ret=%d\n",
214 cpu, ret);
215 return ret;
216 }
217
218 plr_print_bits(s, val, 64);
219 }
220
221 return 0;
222}
223
224static ssize_t plr_status_write(struct file *filp, const char __user *ubuf,
225 size_t count, loff_t *ppos)
226{
227 struct seq_file *s = filp->private_data;
228 struct tpmi_plr_die *plr_die = s->private;
229 bool val;
230 int ret;
231
232 ret = kstrtobool_from_user(ubuf, count, &val);
233 if (ret)
234 return ret;
235
236 if (val != 0)
237 return -EINVAL;
238
239 plr_write(0, plr_die, PLR_DIE_LEVEL);
240
241 guard(mutex)(&plr_die->lock);
242
243 for (int cpu = 0; cpu < nr_cpu_ids; cpu++) {
244 if (plr_die->die_id != tpmi_get_power_domain_id(cpu))
245 continue;
246
247 if (plr_die->package_id != topology_physical_package_id(cpu))
248 continue;
249
250 plr_clear_cpu_status(plr_die, cpu);
251 }
252
253 return count;
254}
255DEFINE_SHOW_STORE_ATTRIBUTE(plr_status);
256
257static int intel_plr_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id)
258{
259 struct intel_tpmi_plat_info *plat_info;
260 struct dentry *dentry;
261 int i, num_resources;
262 struct resource *res;
263 struct tpmi_plr *plr;
264 void __iomem *base;
265 char name[16];
266 int err;
267
268 plat_info = tpmi_get_platform_data(auxdev);
269 if (!plat_info)
270 return dev_err_probe(&auxdev->dev, -EINVAL, "No platform info\n");
271
272 dentry = tpmi_get_debugfs_dir(auxdev);
273 if (!dentry)
274 return dev_err_probe(&auxdev->dev, -ENODEV, "No TPMI debugfs directory.\n");
275
276 num_resources = tpmi_get_resource_count(auxdev);
277 if (!num_resources)
278 return -EINVAL;
279
280 plr = devm_kzalloc(&auxdev->dev, sizeof(*plr), GFP_KERNEL);
281 if (!plr)
282 return -ENOMEM;
283
284 plr->die_info = devm_kcalloc(&auxdev->dev, num_resources, sizeof(*plr->die_info),
285 GFP_KERNEL);
286 if (!plr->die_info)
287 return -ENOMEM;
288
289 plr->num_dies = num_resources;
290 plr->dbgfs_dir = debugfs_create_dir("plr", dentry);
291 plr->auxdev = auxdev;
292
293 for (i = 0; i < num_resources; i++) {
294 res = tpmi_get_resource_at_index(auxdev, i);
295 if (!res) {
296 err = dev_err_probe(&auxdev->dev, -EINVAL, "No resource\n");
297 goto err;
298 }
299
300 base = devm_ioremap_resource(&auxdev->dev, res);
301 if (IS_ERR(base)) {
302 err = PTR_ERR(base);
303 goto err;
304 }
305
306 plr->die_info[i].base = base;
307 plr->die_info[i].package_id = plat_info->package_id;
308 plr->die_info[i].die_id = i;
309 plr->die_info[i].plr = plr;
310 mutex_init(&plr->die_info[i].lock);
311
312 if (plr_read(&plr->die_info[i], PLR_HEADER) == PLR_INVALID)
313 continue;
314
315 snprintf(name, sizeof(name), "domain%d", i);
316
317 dentry = debugfs_create_dir(name, plr->dbgfs_dir);
318 debugfs_create_file("status", 0444, dentry, &plr->die_info[i],
319 &plr_status_fops);
320 }
321
322 auxiliary_set_drvdata(auxdev, plr);
323
324 return 0;
325
326err:
327 debugfs_remove_recursive(plr->dbgfs_dir);
328 return err;
329}
330
331static void intel_plr_remove(struct auxiliary_device *auxdev)
332{
333 struct tpmi_plr *plr = auxiliary_get_drvdata(auxdev);
334
335 debugfs_remove_recursive(plr->dbgfs_dir);
336}
337
338static const struct auxiliary_device_id intel_plr_id_table[] = {
339 { .name = "intel_vsec.tpmi-plr" },
340 {}
341};
342MODULE_DEVICE_TABLE(auxiliary, intel_plr_id_table);
343
344static struct auxiliary_driver intel_plr_aux_driver = {
345 .id_table = intel_plr_id_table,
346 .remove = intel_plr_remove,
347 .probe = intel_plr_probe,
348};
349module_auxiliary_driver(intel_plr_aux_driver);
350
351MODULE_IMPORT_NS("INTEL_TPMI");
352MODULE_IMPORT_NS("INTEL_TPMI_POWER_DOMAIN");
353MODULE_DESCRIPTION("Intel TPMI PLR Driver");
354MODULE_LICENSE("GPL");