In preparation for enabling heterogeneous PMUs on ACPI systems
add routines that detect this and group the resulting PMUs and
interrupts.
Signed-off-by: Jeremy Linton <jeremy.linton@xxxxxxx>
---
drivers/perf/arm_pmu_acpi.c | 137 +++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 134 insertions(+), 3 deletions(-)
diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c
index a24cdd0..482a54d 100644
--- a/drivers/perf/arm_pmu_acpi.c
+++ b/drivers/perf/arm_pmu_acpi.c
@@ -1,23 +1,36 @@
/*
- * PMU support
+ * ARM ACPI PMU support
*
* Copyright (C) 2015 Red Hat Inc.
+ * Copyright (C) 2016 ARM Ltd.
* Author: Mark Salter <msalter@xxxxxxxxxx>
+ * Jeremy Linton <jeremy.linton@xxxxxxx>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
+#define pr_fmt(fmt) "ACPI-PMU: " fmt
+
+#include <asm/cpu.h>
#include <linux/perf/arm_pmu.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
+#include <linux/list.h>
struct pmu_irq {
- int gsi;
- int trigger;
+ int gsi;
+ int trigger;
+ bool registered;
+};
+
+struct pmu_types {
+ struct list_head list;
+ int cpu_type;
+ int cpu_count;
};
static struct pmu_irq pmu_irqs[NR_CPUS] __initdata;
@@ -36,6 +49,124 @@ void __init arm_pmu_parse_acpi(int cpu, struct acpi_madt_generic_interrupt *gic)
pmu_irqs[cpu].trigger = ACPI_LEVEL_SENSITIVE;
}
+/* Count number and type of CPU cores in the system. */
+void __init arm_pmu_acpi_determine_cpu_types(struct list_head *pmus)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ struct cpuinfo_arm64 *cinfo = per_cpu_ptr(&cpu_data, i);
+ u32 partnum = MIDR_PARTNUM(cinfo->reg_midr);
+ struct pmu_types *pmu;
+
+ list_for_each_entry(pmu, pmus, list) {
+ if (pmu->cpu_type == partnum) {
+ pmu->cpu_count++;
+ break;
+ }
+ }
+
+ /* we didn't find the CPU type, add an entry to identify it */
+ if (&pmu->list == pmus) {
+ pmu = kcalloc(1, sizeof(struct pmu_types), GFP_KERNEL);
+ if (!pmu) {
+ pr_warn("Unable to allocate pmu_types\n");
+ } else {
+ pmu->cpu_type = partnum;
+ pmu->cpu_count++;
+ list_add_tail(&pmu->list, pmus);
+ }
+ }
+ }
+}
+
+/*
+ * Registers the group of PMU interfaces which correspond to the 'last_cpu_id'.
+ * This group utilizes 'count' resources in the 'res'.
+ */
+int __init arm_pmu_acpi_register_pmu(int count, struct resource *res,
+ int last_cpu_id)
+{
+ int i;
+ int err = -ENOMEM;
+ bool free_gsi = false;
+ struct platform_device *pdev;
+
+ if (count) {
+ pdev = platform_device_alloc(ARMV8_PMU_PDEV_NAME, last_cpu_id);
+ if (pdev) {
+ err = platform_device_add_resources(pdev, res, count);
+ if (!err) {
+ err = platform_device_add(pdev);
+ if (err) {
+ pr_warn("Unable to register PMU device\n");
+ free_gsi = true;
+ }
+ } else {
+ pr_warn("Unable to add resources to device\n");
+ free_gsi = true;
+ platform_device_put(pdev);
+ }
+ } else {
+ pr_warn("Unable to allocate platform device\n");
+ free_gsi = true;
+ }
+ }
+
+ /* unmark (and possibly unregister) registered GSIs */
+ for_each_possible_cpu(i) {
+ if (pmu_irqs[i].registered) {
+ if (free_gsi)
+ acpi_unregister_gsi(pmu_irqs[i].gsi);
+ pmu_irqs[i].registered = false;
+ }
+ }
+
+ return err;
+}
+
+/*
+ * For the given cpu/pmu type, walk all known GSIs, register them, and add
+ * them to the resource structure. Return the number of GSI's contained
+ * in the res structure, and the id of the last CPU/PMU we added.
+ */
+int __init arm_pmu_acpi_gsi_res(struct pmu_types *pmus,
+ struct resource *res, int *last_cpu_id)
+{
+ int i, count;
+ int irq;
+
+ pr_info("Setting up %d PMUs for CPU type %X\n", pmus->cpu_count,
+ pmus->cpu_type);
+ /* lets group all the PMU's from similar CPU's together */
+ count = 0;
+ for_each_possible_cpu(i) {
+ struct cpuinfo_arm64 *cinfo = per_cpu_ptr(&cpu_data, i);
+
+ if (pmus->cpu_type == MIDR_PARTNUM(cinfo->reg_midr)) {
+ if (pmu_irqs[i].gsi == 0)
+ continue;
+
+ irq = acpi_register_gsi(NULL, pmu_irqs[i].gsi,
+ pmu_irqs[i].trigger,
+ ACPI_ACTIVE_HIGH);
+
+ res[count].start = res[count].end = irq;
+ res[count].flags = IORESOURCE_IRQ;
+
+ if (pmu_irqs[i].trigger == ACPI_EDGE_SENSITIVE)
+ res[count].flags |= IORESOURCE_IRQ_HIGHEDGE;
+ else
+ res[count].flags |= IORESOURCE_IRQ_HIGHLEVEL;
+
+ pmu_irqs[i].registered = true;
+ count++;
+ (*last_cpu_id) = cinfo->reg_midr;
+ }
+ }
+ return count;
+}
+
static int __init pmu_acpi_init(void)
{
struct platform_device *pdev;
--
2.5.5
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