mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/arch/powerpc/perf/hv-gpci.c
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@@ -1,14 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Hypervisor supplied "gpci" ("get performance counter info") performance
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  * counter support
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  *
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  * Author: Cody P Schafer <cody@linux.vnet.ibm.com>
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  * Copyright 2014 IBM Corporation.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #define pr_fmt(fmt) "hv-gpci: " fmt
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@@ -51,6 +47,8 @@
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 EVENT_DEFINE_RANGE_FORMAT(length, config1, 24, 31);
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 /* u32, byte offset */
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 EVENT_DEFINE_RANGE_FORMAT(offset, config1, 32, 63);
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+
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+static cpumask_t hv_gpci_cpumask;
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 static struct attribute *format_attrs[] = {
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 	&format_attr_request.attr,
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@@ -98,7 +96,15 @@
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 	return sprintf(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT);
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 }
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+static ssize_t cpumask_show(struct device *dev,
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+			    struct device_attribute *attr, char *buf)
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+{
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+	return cpumap_print_to_pagebuf(true, buf, &hv_gpci_cpumask);
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+}
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+
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 static DEVICE_ATTR_RO(kernel_version);
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+static DEVICE_ATTR_RO(cpumask);
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+
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 HV_CAPS_ATTR(version, "0x%x\n");
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 HV_CAPS_ATTR(ga, "%d\n");
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 HV_CAPS_ATTR(expanded, "%d\n");
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@@ -115,6 +121,15 @@
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 	NULL,
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 };
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123
 
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+static struct attribute *cpumask_attrs[] = {
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+	&dev_attr_cpumask.attr,
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+	NULL,
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+};
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+
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+static struct attribute_group cpumask_attr_group = {
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+	.attrs = cpumask_attrs,
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+};
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+
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 static struct attribute_group interface_group = {
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 	.name = "interface",
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 	.attrs = interface_attrs,
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@@ -124,19 +139,11 @@
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 	&format_group,
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 	&event_group,
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 	&interface_group,
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+	&cpumask_attr_group,
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 	NULL,
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 };
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-#define HGPCI_REQ_BUFFER_SIZE	4096
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-#define HGPCI_MAX_DATA_BYTES \
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-	(HGPCI_REQ_BUFFER_SIZE - sizeof(struct hv_get_perf_counter_info_params))
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-
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 static DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));
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-
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-struct hv_gpci_request_buffer {
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-	struct hv_get_perf_counter_info_params params;
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-	uint8_t bytes[HGPCI_MAX_DATA_BYTES];
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-} __packed;
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 static unsigned long single_gpci_request(u32 req, u32 starting_index,
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 		u16 secondary_index, u8 version_in, u32 offset, u8 length,
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@@ -232,15 +239,6 @@
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 		return -EINVAL;
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 	}
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-	/* unsupported modes and filters */
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-	if (event->attr.exclude_user   ||
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-	    event->attr.exclude_kernel ||
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-	    event->attr.exclude_hv     ||
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-	    event->attr.exclude_idle   ||
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-	    event->attr.exclude_host   ||
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-	    event->attr.exclude_guest)
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-		return -EINVAL;
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-
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 	/* no branch sampling */
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 	if (has_branch_stack(event))
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 		return -EOPNOTSUPP;
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@@ -285,7 +283,47 @@
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 	.start       = h_gpci_event_start,
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 	.stop        = h_gpci_event_stop,
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 	.read        = h_gpci_event_update,
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+	.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
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 };
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+
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+static int ppc_hv_gpci_cpu_online(unsigned int cpu)
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+{
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+	if (cpumask_empty(&hv_gpci_cpumask))
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+		cpumask_set_cpu(cpu, &hv_gpci_cpumask);
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+
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+	return 0;
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+}
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+
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+static int ppc_hv_gpci_cpu_offline(unsigned int cpu)
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+{
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+	int target;
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+
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+	/* Check if exiting cpu is used for collecting gpci events */
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+	if (!cpumask_test_and_clear_cpu(cpu, &hv_gpci_cpumask))
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+		return 0;
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+
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+	/* Find a new cpu to collect gpci events */
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+	target = cpumask_last(cpu_active_mask);
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+
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+	if (target < 0 || target >= nr_cpu_ids) {
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+		pr_err("hv_gpci: CPU hotplug init failed\n");
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+		return -1;
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+	}
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+
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+	/* Migrate gpci events to the new target */
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+	cpumask_set_cpu(target, &hv_gpci_cpumask);
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+	perf_pmu_migrate_context(&h_gpci_pmu, cpu, target);
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+
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+	return 0;
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+}
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+
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+static int hv_gpci_cpu_hotplug_init(void)
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+{
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+	return cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
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+			  "perf/powerpc/hv_gcpi:online",
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+			  ppc_hv_gpci_cpu_online,
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+			  ppc_hv_gpci_cpu_offline);
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+}
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 static int hv_gpci_init(void)
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 {
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@@ -307,6 +345,11 @@
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 		return -ENODEV;
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 	}
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+	/* init cpuhotplug */
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+	r = hv_gpci_cpu_hotplug_init();
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+	if (r)
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+		return r;
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+
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 	/* sampling not supported */
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 	h_gpci_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
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