1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Alibaba DDR Sub-System Driveway PMU driver
4 *
5 * Copyright (C) 2022 Alibaba Inc
6 */
7
8 #define ALI_DRW_PMUNAME "ali_drw"
9 #define ALI_DRW_DRVNAME ALI_DRW_PMUNAME "_pmu"
10 #define pr_fmt(fmt) ALI_DRW_DRVNAME ": " fmt
11
12 #include <linux/acpi.h>
13 #include <linux/bitfield.h>
14 #include <linux/bitmap.h>
15 #include <linux/bitops.h>
16 #include <linux/cpuhotplug.h>
17 #include <linux/cpumask.h>
18 #include <linux/device.h>
19 #include <linux/errno.h>
20 #include <linux/interrupt.h>
21 #include <linux/irq.h>
22 #include <linux/kernel.h>
23 #include <linux/list.h>
24 #include <linux/module.h>
25 #include <linux/mutex.h>
26 #include <linux/perf_event.h>
27 #include <linux/platform_device.h>
28 #include <linux/printk.h>
29 #include <linux/rculist.h>
30 #include <linux/refcount.h>
31
32
33 #define ALI_DRW_PMU_COMMON_MAX_COUNTERS 16
34 #define ALI_DRW_PMU_TEST_SEL_COMMON_COUNTER_BASE 19
35
36 #define ALI_DRW_PMU_PA_SHIFT 12
37 #define ALI_DRW_PMU_CNT_INIT 0x00000000
38 #define ALI_DRW_CNT_MAX_PERIOD 0xffffffff
39 #define ALI_DRW_PMU_CYCLE_EVT_ID 0x80
40
41 #define ALI_DRW_PMU_CNT_CTRL 0xC00
42 #define ALI_DRW_PMU_CNT_RST BIT(2)
43 #define ALI_DRW_PMU_CNT_STOP BIT(1)
44 #define ALI_DRW_PMU_CNT_START BIT(0)
45
46 #define ALI_DRW_PMU_CNT_STATE 0xC04
47 #define ALI_DRW_PMU_TEST_CTRL 0xC08
48 #define ALI_DRW_PMU_CNT_PRELOAD 0xC0C
49
50 #define ALI_DRW_PMU_CYCLE_CNT_HIGH_MASK GENMASK(23, 0)
51 #define ALI_DRW_PMU_CYCLE_CNT_LOW_MASK GENMASK(31, 0)
52 #define ALI_DRW_PMU_CYCLE_CNT_HIGH 0xC10
53 #define ALI_DRW_PMU_CYCLE_CNT_LOW 0xC14
54
55 /* PMU EVENT SEL 0-3 are paired in 32-bit registers on a 4-byte stride */
56 #define ALI_DRW_PMU_EVENT_SEL0 0xC68
57 /* counter 0-3 use sel0, counter 4-7 use sel1...*/
58 #define ALI_DRW_PMU_EVENT_SELn(n) \
59 (ALI_DRW_PMU_EVENT_SEL0 + (n / 4) * 0x4)
60 #define ALI_DRW_PMCOM_CNT_EN BIT(7)
61 #define ALI_DRW_PMCOM_CNT_EVENT_MASK GENMASK(5, 0)
62 #define ALI_DRW_PMCOM_CNT_EVENT_OFFSET(n) \
63 (8 * (n % 4))
64
65 /* PMU COMMON COUNTER 0-15, are paired in 32-bit registers on a 4-byte stride */
66 #define ALI_DRW_PMU_COMMON_COUNTER0 0xC78
67 #define ALI_DRW_PMU_COMMON_COUNTERn(n) \
68 (ALI_DRW_PMU_COMMON_COUNTER0 + 0x4 * (n))
69
70 #define ALI_DRW_PMU_OV_INTR_ENABLE_CTL 0xCB8
71 #define ALI_DRW_PMU_OV_INTR_DISABLE_CTL 0xCBC
72 #define ALI_DRW_PMU_OV_INTR_ENABLE_STATUS 0xCC0
73 #define ALI_DRW_PMU_OV_INTR_CLR 0xCC4
74 #define ALI_DRW_PMU_OV_INTR_STATUS 0xCC8
75 #define ALI_DRW_PMCOM_CNT_OV_INTR_MASK GENMASK(23, 8)
76 #define ALI_DRW_PMBW_CNT_OV_INTR_MASK GENMASK(7, 0)
77 #define ALI_DRW_PMU_OV_INTR_MASK GENMASK_ULL(63, 0)
78
79 static int ali_drw_cpuhp_state_num;
80
81 static LIST_HEAD(ali_drw_pmu_irqs);
82 static DEFINE_MUTEX(ali_drw_pmu_irqs_lock);
83
84 struct ali_drw_pmu_irq {
85 struct hlist_node node;
86 struct list_head irqs_node;
87 struct list_head pmus_node;
88 int irq_num;
89 int cpu;
90 refcount_t refcount;
91 };
92
93 struct ali_drw_pmu {
94 void __iomem *cfg_base;
95 struct device *dev;
96
97 struct list_head pmus_node;
98 struct ali_drw_pmu_irq *irq;
99 int irq_num;
100 int cpu;
101 DECLARE_BITMAP(used_mask, ALI_DRW_PMU_COMMON_MAX_COUNTERS);
102 struct perf_event *events[ALI_DRW_PMU_COMMON_MAX_COUNTERS];
103 int evtids[ALI_DRW_PMU_COMMON_MAX_COUNTERS];
104
105 struct pmu pmu;
106 };
107
108 #define to_ali_drw_pmu(p) (container_of(p, struct ali_drw_pmu, pmu))
109
110 #define DRW_CONFIG_EVENTID GENMASK(7, 0)
111 #define GET_DRW_EVENTID(event) FIELD_GET(DRW_CONFIG_EVENTID, (event)->attr.config)
112
ali_drw_pmu_format_show(struct device * dev,struct device_attribute * attr,char * buf)113 static ssize_t ali_drw_pmu_format_show(struct device *dev,
114 struct device_attribute *attr, char *buf)
115 {
116 struct dev_ext_attribute *eattr;
117
118 eattr = container_of(attr, struct dev_ext_attribute, attr);
119
120 return sprintf(buf, "%s\n", (char *)eattr->var);
121 }
122
123 /*
124 * PMU event attributes
125 */
ali_drw_pmu_event_show(struct device * dev,struct device_attribute * attr,char * page)126 static ssize_t ali_drw_pmu_event_show(struct device *dev,
127 struct device_attribute *attr, char *page)
128 {
129 struct dev_ext_attribute *eattr;
130
131 eattr = container_of(attr, struct dev_ext_attribute, attr);
132
133 return sprintf(page, "config=0x%lx\n", (unsigned long)eattr->var);
134 }
135
136 #define ALI_DRW_PMU_ATTR(_name, _func, _config) \
137 (&((struct dev_ext_attribute[]) { \
138 { __ATTR(_name, 0444, _func, NULL), (void *)_config } \
139 })[0].attr.attr)
140
141 #define ALI_DRW_PMU_FORMAT_ATTR(_name, _config) \
142 ALI_DRW_PMU_ATTR(_name, ali_drw_pmu_format_show, (void *)_config)
143 #define ALI_DRW_PMU_EVENT_ATTR(_name, _config) \
144 ALI_DRW_PMU_ATTR(_name, ali_drw_pmu_event_show, (unsigned long)_config)
145
146 static struct attribute *ali_drw_pmu_events_attrs[] = {
147 ALI_DRW_PMU_EVENT_ATTR(hif_rd_or_wr, 0x0),
148 ALI_DRW_PMU_EVENT_ATTR(hif_wr, 0x1),
149 ALI_DRW_PMU_EVENT_ATTR(hif_rd, 0x2),
150 ALI_DRW_PMU_EVENT_ATTR(hif_rmw, 0x3),
151 ALI_DRW_PMU_EVENT_ATTR(hif_hi_pri_rd, 0x4),
152 ALI_DRW_PMU_EVENT_ATTR(dfi_wr_data_cycles, 0x7),
153 ALI_DRW_PMU_EVENT_ATTR(dfi_rd_data_cycles, 0x8),
154 ALI_DRW_PMU_EVENT_ATTR(hpr_xact_when_critical, 0x9),
155 ALI_DRW_PMU_EVENT_ATTR(lpr_xact_when_critical, 0xA),
156 ALI_DRW_PMU_EVENT_ATTR(wr_xact_when_critical, 0xB),
157 ALI_DRW_PMU_EVENT_ATTR(op_is_activate, 0xC),
158 ALI_DRW_PMU_EVENT_ATTR(op_is_rd_or_wr, 0xD),
159 ALI_DRW_PMU_EVENT_ATTR(op_is_rd_activate, 0xE),
160 ALI_DRW_PMU_EVENT_ATTR(op_is_rd, 0xF),
161 ALI_DRW_PMU_EVENT_ATTR(op_is_wr, 0x10),
162 ALI_DRW_PMU_EVENT_ATTR(op_is_mwr, 0x11),
163 ALI_DRW_PMU_EVENT_ATTR(op_is_precharge, 0x12),
164 ALI_DRW_PMU_EVENT_ATTR(precharge_for_rdwr, 0x13),
165 ALI_DRW_PMU_EVENT_ATTR(precharge_for_other, 0x14),
166 ALI_DRW_PMU_EVENT_ATTR(rdwr_transitions, 0x15),
167 ALI_DRW_PMU_EVENT_ATTR(write_combine, 0x16),
168 ALI_DRW_PMU_EVENT_ATTR(war_hazard, 0x17),
169 ALI_DRW_PMU_EVENT_ATTR(raw_hazard, 0x18),
170 ALI_DRW_PMU_EVENT_ATTR(waw_hazard, 0x19),
171 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk0, 0x1A),
172 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk1, 0x1B),
173 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk2, 0x1C),
174 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_selfref_rk3, 0x1D),
175 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk0, 0x1E),
176 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk1, 0x1F),
177 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk2, 0x20),
178 ALI_DRW_PMU_EVENT_ATTR(op_is_enter_powerdown_rk3, 0x21),
179 ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk0, 0x26),
180 ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk1, 0x27),
181 ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk2, 0x28),
182 ALI_DRW_PMU_EVENT_ATTR(selfref_mode_rk3, 0x29),
183 ALI_DRW_PMU_EVENT_ATTR(op_is_refresh, 0x2A),
184 ALI_DRW_PMU_EVENT_ATTR(op_is_crit_ref, 0x2B),
185 ALI_DRW_PMU_EVENT_ATTR(op_is_load_mode, 0x2D),
186 ALI_DRW_PMU_EVENT_ATTR(op_is_zqcl, 0x2E),
187 ALI_DRW_PMU_EVENT_ATTR(visible_window_limit_reached_rd, 0x30),
188 ALI_DRW_PMU_EVENT_ATTR(visible_window_limit_reached_wr, 0x31),
189 ALI_DRW_PMU_EVENT_ATTR(op_is_dqsosc_mpc, 0x34),
190 ALI_DRW_PMU_EVENT_ATTR(op_is_dqsosc_mrr, 0x35),
191 ALI_DRW_PMU_EVENT_ATTR(op_is_tcr_mrr, 0x36),
192 ALI_DRW_PMU_EVENT_ATTR(op_is_zqstart, 0x37),
193 ALI_DRW_PMU_EVENT_ATTR(op_is_zqlatch, 0x38),
194 ALI_DRW_PMU_EVENT_ATTR(chi_txreq, 0x39),
195 ALI_DRW_PMU_EVENT_ATTR(chi_txdat, 0x3A),
196 ALI_DRW_PMU_EVENT_ATTR(chi_rxdat, 0x3B),
197 ALI_DRW_PMU_EVENT_ATTR(chi_rxrsp, 0x3C),
198 ALI_DRW_PMU_EVENT_ATTR(tsz_vio, 0x3D),
199 ALI_DRW_PMU_EVENT_ATTR(cycle, 0x80),
200 NULL,
201 };
202
203 static struct attribute_group ali_drw_pmu_events_attr_group = {
204 .name = "events",
205 .attrs = ali_drw_pmu_events_attrs,
206 };
207
208 static struct attribute *ali_drw_pmu_format_attr[] = {
209 ALI_DRW_PMU_FORMAT_ATTR(event, "config:0-7"),
210 NULL,
211 };
212
213 static const struct attribute_group ali_drw_pmu_format_group = {
214 .name = "format",
215 .attrs = ali_drw_pmu_format_attr,
216 };
217
ali_drw_pmu_cpumask_show(struct device * dev,struct device_attribute * attr,char * buf)218 static ssize_t ali_drw_pmu_cpumask_show(struct device *dev,
219 struct device_attribute *attr,
220 char *buf)
221 {
222 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(dev_get_drvdata(dev));
223
224 return cpumap_print_to_pagebuf(true, buf, cpumask_of(drw_pmu->cpu));
225 }
226
227 static struct device_attribute ali_drw_pmu_cpumask_attr =
228 __ATTR(cpumask, 0444, ali_drw_pmu_cpumask_show, NULL);
229
230 static struct attribute *ali_drw_pmu_cpumask_attrs[] = {
231 &ali_drw_pmu_cpumask_attr.attr,
232 NULL,
233 };
234
235 static const struct attribute_group ali_drw_pmu_cpumask_attr_group = {
236 .attrs = ali_drw_pmu_cpumask_attrs,
237 };
238
ali_drw_pmu_identifier_show(struct device * dev,struct device_attribute * attr,char * page)239 static ssize_t ali_drw_pmu_identifier_show(struct device *dev,
240 struct device_attribute *attr,
241 char *page)
242 {
243 return sysfs_emit(page, "%s\n", "ali_drw_pmu");
244 }
245
ali_drw_pmu_identifier_attr_visible(struct kobject * kobj,struct attribute * attr,int n)246 static umode_t ali_drw_pmu_identifier_attr_visible(struct kobject *kobj,
247 struct attribute *attr, int n)
248 {
249 return attr->mode;
250 }
251
252 static struct device_attribute ali_drw_pmu_identifier_attr =
253 __ATTR(identifier, 0444, ali_drw_pmu_identifier_show, NULL);
254
255 static struct attribute *ali_drw_pmu_identifier_attrs[] = {
256 &ali_drw_pmu_identifier_attr.attr,
257 NULL
258 };
259
260 static const struct attribute_group ali_drw_pmu_identifier_attr_group = {
261 .attrs = ali_drw_pmu_identifier_attrs,
262 .is_visible = ali_drw_pmu_identifier_attr_visible
263 };
264
265 static const struct attribute_group *ali_drw_pmu_attr_groups[] = {
266 &ali_drw_pmu_events_attr_group,
267 &ali_drw_pmu_cpumask_attr_group,
268 &ali_drw_pmu_format_group,
269 &ali_drw_pmu_identifier_attr_group,
270 NULL,
271 };
272
273 /* find a counter for event, then in add func, hw.idx will equal to counter */
ali_drw_get_counter_idx(struct perf_event * event)274 static int ali_drw_get_counter_idx(struct perf_event *event)
275 {
276 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
277 int idx;
278
279 for (idx = 0; idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS; ++idx) {
280 if (!test_and_set_bit(idx, drw_pmu->used_mask))
281 return idx;
282 }
283
284 /* The counters are all in use. */
285 return -EBUSY;
286 }
287
ali_drw_pmu_read_counter(struct perf_event * event)288 static u64 ali_drw_pmu_read_counter(struct perf_event *event)
289 {
290 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
291 u64 cycle_high, cycle_low;
292
293 if (GET_DRW_EVENTID(event) == ALI_DRW_PMU_CYCLE_EVT_ID) {
294 cycle_high = readl(drw_pmu->cfg_base + ALI_DRW_PMU_CYCLE_CNT_HIGH);
295 cycle_high &= ALI_DRW_PMU_CYCLE_CNT_HIGH_MASK;
296 cycle_low = readl(drw_pmu->cfg_base + ALI_DRW_PMU_CYCLE_CNT_LOW);
297 cycle_low &= ALI_DRW_PMU_CYCLE_CNT_LOW_MASK;
298 return (cycle_high << 32 | cycle_low);
299 }
300
301 return readl(drw_pmu->cfg_base +
302 ALI_DRW_PMU_COMMON_COUNTERn(event->hw.idx));
303 }
304
ali_drw_pmu_event_update(struct perf_event * event)305 static void ali_drw_pmu_event_update(struct perf_event *event)
306 {
307 struct hw_perf_event *hwc = &event->hw;
308 u64 delta, prev, now;
309
310 do {
311 prev = local64_read(&hwc->prev_count);
312 now = ali_drw_pmu_read_counter(event);
313 } while (local64_cmpxchg(&hwc->prev_count, prev, now) != prev);
314
315 /* handle overflow. */
316 delta = now - prev;
317 if (GET_DRW_EVENTID(event) == ALI_DRW_PMU_CYCLE_EVT_ID)
318 delta &= ALI_DRW_PMU_OV_INTR_MASK;
319 else
320 delta &= ALI_DRW_CNT_MAX_PERIOD;
321 local64_add(delta, &event->count);
322 }
323
ali_drw_pmu_event_set_period(struct perf_event * event)324 static void ali_drw_pmu_event_set_period(struct perf_event *event)
325 {
326 u64 pre_val;
327 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
328
329 /* set a preload counter for test purpose */
330 writel(ALI_DRW_PMU_TEST_SEL_COMMON_COUNTER_BASE + event->hw.idx,
331 drw_pmu->cfg_base + ALI_DRW_PMU_TEST_CTRL);
332
333 /* set conunter initial value */
334 pre_val = ALI_DRW_PMU_CNT_INIT;
335 writel(pre_val, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_PRELOAD);
336 local64_set(&event->hw.prev_count, pre_val);
337
338 /* set sel mode to zero to start test */
339 writel(0x0, drw_pmu->cfg_base + ALI_DRW_PMU_TEST_CTRL);
340 }
341
ali_drw_pmu_enable_counter(struct perf_event * event)342 static void ali_drw_pmu_enable_counter(struct perf_event *event)
343 {
344 u32 val, subval, reg, shift;
345 int counter = event->hw.idx;
346 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
347
348 reg = ALI_DRW_PMU_EVENT_SELn(counter);
349 val = readl(drw_pmu->cfg_base + reg);
350 subval = FIELD_PREP(ALI_DRW_PMCOM_CNT_EN, 1) |
351 FIELD_PREP(ALI_DRW_PMCOM_CNT_EVENT_MASK, drw_pmu->evtids[counter]);
352
353 shift = ALI_DRW_PMCOM_CNT_EVENT_OFFSET(counter);
354 val &= ~(GENMASK(7, 0) << shift);
355 val |= subval << shift;
356
357 writel(val, drw_pmu->cfg_base + reg);
358 }
359
ali_drw_pmu_disable_counter(struct perf_event * event)360 static void ali_drw_pmu_disable_counter(struct perf_event *event)
361 {
362 u32 val, reg, subval, shift;
363 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
364 int counter = event->hw.idx;
365
366 reg = ALI_DRW_PMU_EVENT_SELn(counter);
367 val = readl(drw_pmu->cfg_base + reg);
368 subval = FIELD_PREP(ALI_DRW_PMCOM_CNT_EN, 0) |
369 FIELD_PREP(ALI_DRW_PMCOM_CNT_EVENT_MASK, 0);
370
371 shift = ALI_DRW_PMCOM_CNT_EVENT_OFFSET(counter);
372 val &= ~(GENMASK(7, 0) << shift);
373 val |= subval << shift;
374
375 writel(val, drw_pmu->cfg_base + reg);
376 }
377
ali_drw_pmu_isr(int irq_num,void * data)378 static irqreturn_t ali_drw_pmu_isr(int irq_num, void *data)
379 {
380 struct ali_drw_pmu_irq *irq = data;
381 struct ali_drw_pmu *drw_pmu;
382 irqreturn_t ret = IRQ_NONE;
383
384 rcu_read_lock();
385 list_for_each_entry_rcu(drw_pmu, &irq->pmus_node, pmus_node) {
386 unsigned long status, clr_status;
387 struct perf_event *event;
388 unsigned int idx;
389
390 for (idx = 0; idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS; idx++) {
391 event = drw_pmu->events[idx];
392 if (!event)
393 continue;
394 ali_drw_pmu_disable_counter(event);
395 }
396
397 /* common counter intr status */
398 status = readl(drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_STATUS);
399 status = FIELD_GET(ALI_DRW_PMCOM_CNT_OV_INTR_MASK, status);
400 if (status) {
401 for_each_set_bit(idx, &status,
402 ALI_DRW_PMU_COMMON_MAX_COUNTERS) {
403 event = drw_pmu->events[idx];
404 if (WARN_ON_ONCE(!event))
405 continue;
406 ali_drw_pmu_event_update(event);
407 ali_drw_pmu_event_set_period(event);
408 }
409
410 /* clear common counter intr status */
411 clr_status = FIELD_PREP(ALI_DRW_PMCOM_CNT_OV_INTR_MASK, 1);
412 writel(clr_status,
413 drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_CLR);
414 }
415
416 for (idx = 0; idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS; idx++) {
417 event = drw_pmu->events[idx];
418 if (!event)
419 continue;
420 if (!(event->hw.state & PERF_HES_STOPPED))
421 ali_drw_pmu_enable_counter(event);
422 }
423 if (status)
424 ret = IRQ_HANDLED;
425 }
426 rcu_read_unlock();
427 return ret;
428 }
429
__ali_drw_pmu_init_irq(struct platform_device * pdev,int irq_num)430 static struct ali_drw_pmu_irq *__ali_drw_pmu_init_irq(struct platform_device
431 *pdev, int irq_num)
432 {
433 int ret;
434 struct ali_drw_pmu_irq *irq;
435
436 list_for_each_entry(irq, &ali_drw_pmu_irqs, irqs_node) {
437 if (irq->irq_num == irq_num
438 && refcount_inc_not_zero(&irq->refcount))
439 return irq;
440 }
441
442 irq = kzalloc(sizeof(*irq), GFP_KERNEL);
443 if (!irq)
444 return ERR_PTR(-ENOMEM);
445
446 INIT_LIST_HEAD(&irq->pmus_node);
447
448 /* Pick one CPU to be the preferred one to use */
449 irq->cpu = smp_processor_id();
450 refcount_set(&irq->refcount, 1);
451
452 /*
453 * FIXME: one of DDRSS Driveway PMU overflow interrupt shares the same
454 * irq number with MPAM ERR_IRQ. To register DDRSS PMU and MPAM drivers
455 * successfully, add IRQF_SHARED flag. Howerer, PMU interrupt should not
456 * share with other component.
457 */
458 ret = devm_request_irq(&pdev->dev, irq_num, ali_drw_pmu_isr,
459 IRQF_SHARED, dev_name(&pdev->dev), irq);
460 if (ret < 0) {
461 dev_err(&pdev->dev,
462 "Fail to request IRQ:%d ret:%d\n", irq_num, ret);
463 goto out_free;
464 }
465
466 ret = irq_set_affinity_hint(irq_num, cpumask_of(irq->cpu));
467 if (ret)
468 goto out_free;
469
470 ret = cpuhp_state_add_instance_nocalls(ali_drw_cpuhp_state_num,
471 &irq->node);
472 if (ret)
473 goto out_free;
474
475 irq->irq_num = irq_num;
476 list_add(&irq->irqs_node, &ali_drw_pmu_irqs);
477
478 return irq;
479
480 out_free:
481 kfree(irq);
482 return ERR_PTR(ret);
483 }
484
ali_drw_pmu_init_irq(struct ali_drw_pmu * drw_pmu,struct platform_device * pdev)485 static int ali_drw_pmu_init_irq(struct ali_drw_pmu *drw_pmu,
486 struct platform_device *pdev)
487 {
488 int irq_num;
489 struct ali_drw_pmu_irq *irq;
490
491 /* Read and init IRQ */
492 irq_num = platform_get_irq(pdev, 0);
493 if (irq_num < 0)
494 return irq_num;
495
496 mutex_lock(&ali_drw_pmu_irqs_lock);
497 irq = __ali_drw_pmu_init_irq(pdev, irq_num);
498 mutex_unlock(&ali_drw_pmu_irqs_lock);
499
500 if (IS_ERR(irq))
501 return PTR_ERR(irq);
502
503 drw_pmu->irq = irq;
504
505 mutex_lock(&ali_drw_pmu_irqs_lock);
506 list_add_rcu(&drw_pmu->pmus_node, &irq->pmus_node);
507 mutex_unlock(&ali_drw_pmu_irqs_lock);
508
509 return 0;
510 }
511
ali_drw_pmu_uninit_irq(struct ali_drw_pmu * drw_pmu)512 static void ali_drw_pmu_uninit_irq(struct ali_drw_pmu *drw_pmu)
513 {
514 struct ali_drw_pmu_irq *irq = drw_pmu->irq;
515
516 mutex_lock(&ali_drw_pmu_irqs_lock);
517 list_del_rcu(&drw_pmu->pmus_node);
518
519 if (!refcount_dec_and_test(&irq->refcount)) {
520 mutex_unlock(&ali_drw_pmu_irqs_lock);
521 return;
522 }
523
524 list_del(&irq->irqs_node);
525 mutex_unlock(&ali_drw_pmu_irqs_lock);
526
527 WARN_ON(irq_set_affinity_hint(irq->irq_num, NULL));
528 cpuhp_state_remove_instance_nocalls(ali_drw_cpuhp_state_num,
529 &irq->node);
530 kfree(irq);
531 }
532
ali_drw_pmu_event_init(struct perf_event * event)533 static int ali_drw_pmu_event_init(struct perf_event *event)
534 {
535 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
536 struct hw_perf_event *hwc = &event->hw;
537 struct perf_event *sibling;
538 struct device *dev = drw_pmu->pmu.dev;
539
540 if (event->attr.type != event->pmu->type)
541 return -ENOENT;
542
543 if (is_sampling_event(event)) {
544 dev_err(dev, "Sampling not supported!\n");
545 return -EOPNOTSUPP;
546 }
547
548 if (event->attach_state & PERF_ATTACH_TASK) {
549 dev_err(dev, "Per-task counter cannot allocate!\n");
550 return -EOPNOTSUPP;
551 }
552
553 event->cpu = drw_pmu->cpu;
554 if (event->cpu < 0) {
555 dev_err(dev, "Per-task mode not supported!\n");
556 return -EOPNOTSUPP;
557 }
558
559 if (event->group_leader != event &&
560 !is_software_event(event->group_leader)) {
561 dev_err(dev, "driveway only allow one event!\n");
562 return -EINVAL;
563 }
564
565 for_each_sibling_event(sibling, event->group_leader) {
566 if (sibling != event && !is_software_event(sibling)) {
567 dev_err(dev, "driveway event not allowed!\n");
568 return -EINVAL;
569 }
570 }
571
572 /* reset all the pmu counters */
573 writel(ALI_DRW_PMU_CNT_RST, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
574
575 hwc->idx = -1;
576
577 return 0;
578 }
579
ali_drw_pmu_start(struct perf_event * event,int flags)580 static void ali_drw_pmu_start(struct perf_event *event, int flags)
581 {
582 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
583
584 event->hw.state = 0;
585
586 if (GET_DRW_EVENTID(event) == ALI_DRW_PMU_CYCLE_EVT_ID) {
587 writel(ALI_DRW_PMU_CNT_START,
588 drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
589 return;
590 }
591
592 ali_drw_pmu_event_set_period(event);
593 if (flags & PERF_EF_RELOAD) {
594 unsigned long prev_raw_count =
595 local64_read(&event->hw.prev_count);
596 writel(prev_raw_count,
597 drw_pmu->cfg_base + ALI_DRW_PMU_CNT_PRELOAD);
598 }
599
600 ali_drw_pmu_enable_counter(event);
601
602 writel(ALI_DRW_PMU_CNT_START, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
603 }
604
ali_drw_pmu_stop(struct perf_event * event,int flags)605 static void ali_drw_pmu_stop(struct perf_event *event, int flags)
606 {
607 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
608
609 if (event->hw.state & PERF_HES_STOPPED)
610 return;
611
612 if (GET_DRW_EVENTID(event) != ALI_DRW_PMU_CYCLE_EVT_ID)
613 ali_drw_pmu_disable_counter(event);
614
615 writel(ALI_DRW_PMU_CNT_STOP, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
616
617 ali_drw_pmu_event_update(event);
618 event->hw.state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
619 }
620
ali_drw_pmu_add(struct perf_event * event,int flags)621 static int ali_drw_pmu_add(struct perf_event *event, int flags)
622 {
623 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
624 struct hw_perf_event *hwc = &event->hw;
625 int idx = -1;
626 int evtid;
627
628 evtid = GET_DRW_EVENTID(event);
629
630 if (evtid != ALI_DRW_PMU_CYCLE_EVT_ID) {
631 idx = ali_drw_get_counter_idx(event);
632 if (idx < 0)
633 return idx;
634 drw_pmu->events[idx] = event;
635 drw_pmu->evtids[idx] = evtid;
636 }
637 hwc->idx = idx;
638
639 hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
640
641 if (flags & PERF_EF_START)
642 ali_drw_pmu_start(event, PERF_EF_RELOAD);
643
644 /* Propagate our changes to the userspace mapping. */
645 perf_event_update_userpage(event);
646
647 return 0;
648 }
649
ali_drw_pmu_del(struct perf_event * event,int flags)650 static void ali_drw_pmu_del(struct perf_event *event, int flags)
651 {
652 struct ali_drw_pmu *drw_pmu = to_ali_drw_pmu(event->pmu);
653 struct hw_perf_event *hwc = &event->hw;
654 int idx = hwc->idx;
655
656 ali_drw_pmu_stop(event, PERF_EF_UPDATE);
657
658 if (idx >= 0 && idx < ALI_DRW_PMU_COMMON_MAX_COUNTERS) {
659 drw_pmu->events[idx] = NULL;
660 drw_pmu->evtids[idx] = 0;
661 clear_bit(idx, drw_pmu->used_mask);
662 }
663
664 perf_event_update_userpage(event);
665 }
666
ali_drw_pmu_read(struct perf_event * event)667 static void ali_drw_pmu_read(struct perf_event *event)
668 {
669 ali_drw_pmu_event_update(event);
670 }
671
ali_drw_pmu_probe(struct platform_device * pdev)672 static int ali_drw_pmu_probe(struct platform_device *pdev)
673 {
674 struct ali_drw_pmu *drw_pmu;
675 struct resource *res;
676 char *name;
677 int ret;
678
679 drw_pmu = devm_kzalloc(&pdev->dev, sizeof(*drw_pmu), GFP_KERNEL);
680 if (!drw_pmu)
681 return -ENOMEM;
682
683 drw_pmu->dev = &pdev->dev;
684 platform_set_drvdata(pdev, drw_pmu);
685
686 drw_pmu->cfg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
687 if (IS_ERR(drw_pmu->cfg_base))
688 return PTR_ERR(drw_pmu->cfg_base);
689
690 name = devm_kasprintf(drw_pmu->dev, GFP_KERNEL, "ali_drw_%llx",
691 (u64) (res->start >> ALI_DRW_PMU_PA_SHIFT));
692 if (!name)
693 return -ENOMEM;
694
695 writel(ALI_DRW_PMU_CNT_RST, drw_pmu->cfg_base + ALI_DRW_PMU_CNT_CTRL);
696
697 /* enable the generation of interrupt by all common counters */
698 writel(ALI_DRW_PMCOM_CNT_OV_INTR_MASK,
699 drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_ENABLE_CTL);
700
701 /* clearing interrupt status */
702 writel(0xffffff, drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_CLR);
703
704 drw_pmu->cpu = smp_processor_id();
705
706 ret = ali_drw_pmu_init_irq(drw_pmu, pdev);
707 if (ret)
708 return ret;
709
710 drw_pmu->pmu = (struct pmu) {
711 .module = THIS_MODULE,
712 .task_ctx_nr = perf_invalid_context,
713 .event_init = ali_drw_pmu_event_init,
714 .add = ali_drw_pmu_add,
715 .del = ali_drw_pmu_del,
716 .start = ali_drw_pmu_start,
717 .stop = ali_drw_pmu_stop,
718 .read = ali_drw_pmu_read,
719 .attr_groups = ali_drw_pmu_attr_groups,
720 .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
721 };
722
723 ret = perf_pmu_register(&drw_pmu->pmu, name, -1);
724 if (ret) {
725 dev_err(drw_pmu->dev, "DRW Driveway PMU PMU register failed!\n");
726 ali_drw_pmu_uninit_irq(drw_pmu);
727 }
728
729 return ret;
730 }
731
ali_drw_pmu_remove(struct platform_device * pdev)732 static int ali_drw_pmu_remove(struct platform_device *pdev)
733 {
734 struct ali_drw_pmu *drw_pmu = platform_get_drvdata(pdev);
735
736 /* disable the generation of interrupt by all common counters */
737 writel(ALI_DRW_PMCOM_CNT_OV_INTR_MASK,
738 drw_pmu->cfg_base + ALI_DRW_PMU_OV_INTR_DISABLE_CTL);
739
740 ali_drw_pmu_uninit_irq(drw_pmu);
741 perf_pmu_unregister(&drw_pmu->pmu);
742
743 return 0;
744 }
745
ali_drw_pmu_offline_cpu(unsigned int cpu,struct hlist_node * node)746 static int ali_drw_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
747 {
748 struct ali_drw_pmu_irq *irq;
749 struct ali_drw_pmu *drw_pmu;
750 unsigned int target;
751 int ret;
752 cpumask_t node_online_cpus;
753
754 irq = hlist_entry_safe(node, struct ali_drw_pmu_irq, node);
755 if (cpu != irq->cpu)
756 return 0;
757
758 ret = cpumask_and(&node_online_cpus,
759 cpumask_of_node(cpu_to_node(cpu)), cpu_online_mask);
760 if (ret)
761 target = cpumask_any_but(&node_online_cpus, cpu);
762 else
763 target = cpumask_any_but(cpu_online_mask, cpu);
764
765 if (target >= nr_cpu_ids)
766 return 0;
767
768 /* We're only reading, but this isn't the place to be involving RCU */
769 mutex_lock(&ali_drw_pmu_irqs_lock);
770 list_for_each_entry(drw_pmu, &irq->pmus_node, pmus_node)
771 perf_pmu_migrate_context(&drw_pmu->pmu, irq->cpu, target);
772 mutex_unlock(&ali_drw_pmu_irqs_lock);
773
774 WARN_ON(irq_set_affinity_hint(irq->irq_num, cpumask_of(target)));
775 irq->cpu = target;
776
777 return 0;
778 }
779
780 /*
781 * Due to historical reasons, the HID used in the production environment is
782 * ARMHD700, so we leave ARMHD700 as Compatible ID.
783 */
784 static const struct acpi_device_id ali_drw_acpi_match[] = {
785 {"BABA5000", 0},
786 {"ARMHD700", 0},
787 {}
788 };
789
790 MODULE_DEVICE_TABLE(acpi, ali_drw_acpi_match);
791
792 static struct platform_driver ali_drw_pmu_driver = {
793 .driver = {
794 .name = "ali_drw_pmu",
795 .acpi_match_table = ali_drw_acpi_match,
796 },
797 .probe = ali_drw_pmu_probe,
798 .remove = ali_drw_pmu_remove,
799 };
800
ali_drw_pmu_init(void)801 static int __init ali_drw_pmu_init(void)
802 {
803 int ret;
804
805 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
806 "ali_drw_pmu:online",
807 NULL, ali_drw_pmu_offline_cpu);
808
809 if (ret < 0) {
810 pr_err("DRW Driveway PMU: setup hotplug failed, ret = %d\n",
811 ret);
812 return ret;
813 }
814 ali_drw_cpuhp_state_num = ret;
815
816 ret = platform_driver_register(&ali_drw_pmu_driver);
817 if (ret)
818 cpuhp_remove_multi_state(ali_drw_cpuhp_state_num);
819
820 return ret;
821 }
822
ali_drw_pmu_exit(void)823 static void __exit ali_drw_pmu_exit(void)
824 {
825 platform_driver_unregister(&ali_drw_pmu_driver);
826 cpuhp_remove_multi_state(ali_drw_cpuhp_state_num);
827 }
828
829 module_init(ali_drw_pmu_init);
830 module_exit(ali_drw_pmu_exit);
831
832 MODULE_AUTHOR("Hongbo Yao <yaohongbo@linux.alibaba.com>");
833 MODULE_AUTHOR("Neng Chen <nengchen@linux.alibaba.com>");
834 MODULE_AUTHOR("Shuai Xue <xueshuai@linux.alibaba.com>");
835 MODULE_DESCRIPTION("Alibaba DDR Sub-System Driveway PMU driver");
836 MODULE_LICENSE("GPL v2");
837
