diff options
| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2023-08-17 11:24:03 +0530 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2023-08-18 18:07:10 +0100 |
| commit | 1aa3d0274a4aac338ee45a3dfc3b17c944bcc2bc (patch) | |
| tree | e0520212b012cae05dedab209f7cc2cf7a229db2 /drivers/perf | |
| parent | 81e5ee471609848ee1ebf3beb2a46788113fe0eb (diff) | |
arm_pmu: acpi: Add a representative platform device for TRBE
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>
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_pmu_acpi.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c index 48bd62d3993e..05dda19c5359 100644 --- a/drivers/perf/arm_pmu_acpi.c +++ b/drivers/perf/arm_pmu_acpi.c @@ -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; } |