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arm_pmu: acpi: Add a representative platform device for TRBE

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ACPI TRBE does not have a HID for identification which could create and add
a platform device into the platform bus. Also without a platform device, it
cannot be probed and bound to a platform driver.

This creates a dummy platform device for TRBE after ascertaining that ACPI
provides required interrupts uniformly across all cpus on the system. This
device gets created inside drivers/perf/arm_pmu_acpi.c to accommodate TRBE
being built as a module.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20230817055405.249630-3-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Anshuman Khandual 2023-08-17 11:24:03 +05:30 committed by Will Deacon
parent 81e5ee4716
commit 1aa3d0274a
3 changed files with 39 additions and 0 deletions
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3
arch/arm64/include/asm/acpi.h
View File

@ -42,6 +42,9 @@
#define ACPI_MADT_GICC_SPE (offsetof(struct acpi_madt_generic_interrupt, \
spe_interrupt) + sizeof(u16))
#define ACPI_MADT_GICC_TRBE (offsetof(struct acpi_madt_generic_interrupt, \
trbe_interrupt) + sizeof(u16))
/* Basic configuration for ACPI */
#ifdef CONFIG_ACPI
pgprot_t __acpi_get_mem_attribute(phys_addr_t addr);

35
drivers/perf/arm_pmu_acpi.c
View File

@ -163,6 +163,40 @@ static inline void arm_spe_acpi_register_device(void)
}
#endif /* CONFIG_ARM_SPE_PMU */
#if IS_ENABLED(CONFIG_CORESIGHT_TRBE)
static struct resource trbe_resources[] = {
{
/* irq */
.flags = IORESOURCE_IRQ,
}
};
static struct platform_device trbe_dev = {
.name = ARMV8_TRBE_PDEV_NAME,
.id = -1,
.resource = trbe_resources,
.num_resources = ARRAY_SIZE(trbe_resources)
};
static u16 arm_trbe_parse_gsi(struct acpi_madt_generic_interrupt *gicc)
{
return gicc->trbe_interrupt;
}
static void arm_trbe_acpi_register_device(void)
{
int ret = arm_acpi_register_pmu_device(&trbe_dev, ACPI_MADT_GICC_TRBE,
arm_trbe_parse_gsi);
if (ret)
pr_warn("ACPI: TRBE: Unable to register device\n");
}
#else
static inline void arm_trbe_acpi_register_device(void)
{
}
#endif /* CONFIG_CORESIGHT_TRBE */
static int arm_pmu_acpi_parse_irqs(void)
{
int irq, cpu, irq_cpu, err;
@ -398,6 +432,7 @@ static int arm_pmu_acpi_init(void)
return 0;
arm_spe_acpi_register_device();
arm_trbe_acpi_register_device();
return 0;
}

1
include/linux/perf/arm_pmu.h
View File

@ -187,5 +187,6 @@ void armpmu_free_irq(int irq, int cpu);
#endif /* CONFIG_ARM_PMU */
#define ARMV8_SPE_PDEV_NAME "arm,spe-v1"
#define ARMV8_TRBE_PDEV_NAME "arm,trbe"
#endif /* __ARM_PMU_H__ */