arm_pmu: acpi: spe: Add initial MADT/SPE probing

ACPI 6.3 adds additional fields to the MADT GICC
structure to describe SPE PPI's. We pick these out
of the cached reference to the madt_gicc structure
similarly to the core PMU code. We then create a platform
device referring to the IRQ and let the user/module loader
decide whether to load the SPE driver.

Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

3 files changed, 77 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index 7628efbe6c12..d10399b9f998 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -41,6 +41,9 @@
         (!(entry) || (entry)->header.length < ACPI_MADT_GICC_MIN_LENGTH || \
         (unsigned long)(entry) + (entry)->header.length > (end))
 
+#define ACPI_MADT_GICC_SPE  (ACPI_OFFSET(struct acpi_madt_generic_interrupt, \
+        spe_interrupt) + sizeof(u16))
+
 /* Basic configuration for ACPI */
 #ifdef  CONFIG_ACPI
 pgprot_t __acpi_get_mem_attribute(phys_addr_t addr);
diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c
index 0f197516d708..864d7ebe45e9 100644
--- a/drivers/perf/arm_pmu_acpi.c
+++ b/drivers/perf/arm_pmu_acpi.c
@@ -74,6 +74,76 @@ static void arm_pmu_acpi_unregister_irq(int cpu)
         acpi_unregister_gsi(gsi);
 }
 
+#if IS_ENABLED(CONFIG_ARM_SPE_PMU)
+static struct resource spe_resources[] = {
+        {
+                /* irq */
+                .flags          = IORESOURCE_IRQ,
+        }
+};
+
+static struct platform_device spe_dev = {
+        .name = ARMV8_SPE_PDEV_NAME,
+        .id = -1,
+        .resource = spe_resources,
+        .num_resources = ARRAY_SIZE(spe_resources)
+};
+
+/*
+ * For lack of a better place, hook the normal PMU MADT walk
+ * and create a SPE device if we detect a recent MADT with
+ * a homogeneous PPI mapping.
+ */
+static void arm_spe_acpi_register_device(void)
+{
+        int cpu, hetid, irq, ret;
+        bool first = true;
+        u16 gsi = 0;
+
+        /*
+         * Sanity check all the GICC tables for the same interrupt number.
+         * For now, we only support homogeneous ACPI/SPE machines.
+         */
+        for_each_possible_cpu(cpu) {
+                struct acpi_madt_generic_interrupt *gicc;
+
+                gicc = acpi_cpu_get_madt_gicc(cpu);
+                if (gicc->header.length < ACPI_MADT_GICC_SPE)
+                        return;
+
+                if (first) {
+                        gsi = gicc->spe_interrupt;
+                        if (!gsi)
+                                return;
+                        hetid = find_acpi_cpu_topology_hetero_id(cpu);
+                        first = false;
+                } else if ((gsi != gicc->spe_interrupt) ||
+                           (hetid != find_acpi_cpu_topology_hetero_id(cpu))) {
+                        pr_warn("ACPI: SPE must be homogeneous\n");
+                        return;
+                }
+        }
+
+        irq = acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE,
+                                ACPI_ACTIVE_HIGH);
+        if (irq < 0) {
+                pr_warn("ACPI: SPE Unable to register interrupt: %d\n", gsi);
+                return;
+        }
+
+        spe_resources[0].start = irq;
+        ret = platform_device_register(&spe_dev);
+        if (ret < 0) {
+                pr_warn("ACPI: SPE: Unable to register device\n");
+                acpi_unregister_gsi(gsi);
+        }
+}
+#else
+static inline void arm_spe_acpi_register_device(void)
+{
+}
+#endif /* CONFIG_ARM_SPE_PMU */
+
 static int arm_pmu_acpi_parse_irqs(void)
 {
         int irq, cpu, irq_cpu, err;
@@ -279,6 +349,8 @@ static int arm_pmu_acpi_init(void)
         if (acpi_disabled)
                 return 0;
 
+        arm_spe_acpi_register_device();
+
         ret = arm_pmu_acpi_parse_irqs();
         if (ret)
                 return ret;
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 4641e850b204..784bc58f165a 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -175,4 +175,6 @@ void armpmu_free_irq(int irq, int cpu);
 
 #endif /* CONFIG_ARM_PMU */
 
+#define ARMV8_SPE_PDEV_NAME "arm,spe-v1"
+
 #endif /* __ARM_PMU_H__ */