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2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777 
 kernel/arch/powerpc/perf/hv-gpci.c
....@@ -1,14 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Hypervisor supplied "gpci" ("get performance counter info") performance
34  * counter support
45  *
56  * Author: Cody P Schafer <cody@linux.vnet.ibm.com>
67  * Copyright 2014 IBM Corporation.
7
- *
8
- * This program is free software; you can redistribute it and/or
9
- * modify it under the terms of the GNU General Public License
10
- * as published by the Free Software Foundation; either version
11
- * 2 of the License, or (at your option) any later version.
128  */
139 
1410 #define pr_fmt(fmt) "hv-gpci: " fmt
....@@ -52,6 +48,8 @@
5248 /* u32, byte offset */
5349 EVENT_DEFINE_RANGE_FORMAT(offset, config1, 32, 63);
5450 
51
+static cpumask_t hv_gpci_cpumask;
52
+
5553 static struct attribute *format_attrs[] = {
5654 	&format_attr_request.attr,
5755 	&format_attr_starting_index.attr,
....@@ -74,7 +72,7 @@
7472 
7573 static struct attribute_group event_group = {
7674 	.name  = "events",
77
-	.attrs = hv_gpci_event_attrs,
75
+	/* .attrs is set in init */
7876 };
7977 
8078 #define HV_CAPS_ATTR(_name, _format)				\
....@@ -98,7 +96,15 @@
9896 	return sprintf(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT);
9997 }
10098 
99
+static ssize_t cpumask_show(struct device *dev,
100
+			    struct device_attribute *attr, char *buf)
101
+{
102
+	return cpumap_print_to_pagebuf(true, buf, &hv_gpci_cpumask);
103
+}
104
+
101105 static DEVICE_ATTR_RO(kernel_version);
106
+static DEVICE_ATTR_RO(cpumask);
107
+
102108 HV_CAPS_ATTR(version, "0x%x\n");
103109 HV_CAPS_ATTR(ga, "%d\n");
104110 HV_CAPS_ATTR(expanded, "%d\n");
....@@ -115,6 +121,15 @@
115121 	NULL,
116122 };
117123 
124
+static struct attribute *cpumask_attrs[] = {
125
+	&dev_attr_cpumask.attr,
126
+	NULL,
127
+};
128
+
129
+static struct attribute_group cpumask_attr_group = {
130
+	.attrs = cpumask_attrs,
131
+};
132
+
118133 static struct attribute_group interface_group = {
119134 	.name = "interface",
120135 	.attrs = interface_attrs,
....@@ -124,19 +139,11 @@
124139 	&format_group,
125140 	&event_group,
126141 	&interface_group,
142
+	&cpumask_attr_group,
127143 	NULL,
128144 };
129145 
130
-#define HGPCI_REQ_BUFFER_SIZE	4096
131
-#define HGPCI_MAX_DATA_BYTES \
132
-	(HGPCI_REQ_BUFFER_SIZE - sizeof(struct hv_get_perf_counter_info_params))
133
-
134146 static DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));
135
-
136
-struct hv_gpci_request_buffer {
137
-	struct hv_get_perf_counter_info_params params;
138
-	uint8_t bytes[HGPCI_MAX_DATA_BYTES];
139
-} __packed;
140147 
141148 static unsigned long single_gpci_request(u32 req, u32 starting_index,
142149 		u16 secondary_index, u8 version_in, u32 offset, u8 length,
....@@ -232,15 +239,6 @@
232239 		return -EINVAL;
233240 	}
234241 
235
-	/* unsupported modes and filters */
236
-	if (event->attr.exclude_user   ||
237
-	    event->attr.exclude_kernel ||
238
-	    event->attr.exclude_hv     ||
239
-	    event->attr.exclude_idle   ||
240
-	    event->attr.exclude_host   ||
241
-	    event->attr.exclude_guest)
242
-		return -EINVAL;
243
-
244242 	/* no branch sampling */
245243 	if (has_branch_stack(event))
246244 		return -EOPNOTSUPP;
....@@ -285,13 +283,54 @@
285283 	.start       = h_gpci_event_start,
286284 	.stop        = h_gpci_event_stop,
287285 	.read        = h_gpci_event_update,
286
+	.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
288287 };
288
+
289
+static int ppc_hv_gpci_cpu_online(unsigned int cpu)
290
+{
291
+	if (cpumask_empty(&hv_gpci_cpumask))
292
+		cpumask_set_cpu(cpu, &hv_gpci_cpumask);
293
+
294
+	return 0;
295
+}
296
+
297
+static int ppc_hv_gpci_cpu_offline(unsigned int cpu)
298
+{
299
+	int target;
300
+
301
+	/* Check if exiting cpu is used for collecting gpci events */
302
+	if (!cpumask_test_and_clear_cpu(cpu, &hv_gpci_cpumask))
303
+		return 0;
304
+
305
+	/* Find a new cpu to collect gpci events */
306
+	target = cpumask_last(cpu_active_mask);
307
+
308
+	if (target < 0 || target >= nr_cpu_ids) {
309
+		pr_err("hv_gpci: CPU hotplug init failed\n");
310
+		return -1;
311
+	}
312
+
313
+	/* Migrate gpci events to the new target */
314
+	cpumask_set_cpu(target, &hv_gpci_cpumask);
315
+	perf_pmu_migrate_context(&h_gpci_pmu, cpu, target);
316
+
317
+	return 0;
318
+}
319
+
320
+static int hv_gpci_cpu_hotplug_init(void)
321
+{
322
+	return cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
323
+			  "perf/powerpc/hv_gcpi:online",
324
+			  ppc_hv_gpci_cpu_online,
325
+			  ppc_hv_gpci_cpu_offline);
326
+}
289327 
290328 static int hv_gpci_init(void)
291329 {
292330 	int r;
293331 	unsigned long hret;
294332 	struct hv_perf_caps caps;
333
+	struct hv_gpci_request_buffer *arg;
295334 
296335 	hv_gpci_assert_offsets_correct();
297336 
....@@ -307,9 +346,44 @@
307346 		return -ENODEV;
308347 	}
309348 
349
+	/* init cpuhotplug */
350
+	r = hv_gpci_cpu_hotplug_init();
351
+	if (r)
352
+		return r;
353
+
310354 	/* sampling not supported */
311355 	h_gpci_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
312356 
357
+	arg = (void *)get_cpu_var(hv_gpci_reqb);
358
+	memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
359
+
360
+	/*
361
+	 * hcall H_GET_PERF_COUNTER_INFO populates the output
362
+	 * counter_info_version value based on the system hypervisor.
363
+	 * Pass the counter request 0x10 corresponds to request type
364
+	 * 'Dispatch_timebase_by_processor', to get the supported
365
+	 * counter_info_version.
366
+	 */
367
+	arg->params.counter_request = cpu_to_be32(0x10);
368
+
369
+	r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
370
+			virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
371
+	if (r) {
372
+		pr_devel("hcall failed, can't get supported counter_info_version: 0x%x\n", r);
373
+		arg->params.counter_info_version_out = 0x8;
374
+	}
375
+
376
+	/*
377
+	 * Use counter_info_version_out value to assign
378
+	 * required hv-gpci event list.
379
+	 */
380
+	if (arg->params.counter_info_version_out >= 0x8)
381
+		event_group.attrs = hv_gpci_event_attrs;
382
+	else
383
+		event_group.attrs = hv_gpci_event_attrs_v6;
384
+
385
+	put_cpu_var(hv_gpci_reqb);
386
+
313387 	r = perf_pmu_register(&h_gpci_pmu, h_gpci_pmu.name, -1);
314388 	if (r)
315389 		return r;