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author | Anshuman Khandual <anshuman.khandual@arm.com> | 2023-08-17 11:24:02 +0530 |
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committer | Will Deacon <will@kernel.org> | 2023-08-18 18:07:09 +0100 |
commit | 81e5ee471609848ee1ebf3beb2a46788113fe0eb (patch) | |
tree | 1c2678eb246b0c4b3fa6e928d76e32a7cfd77e7c /drivers/perf | |
parent | d11a69873d9a7435fe6a48531e165ab80a8b1221 (diff) | |
download | linux-stable-81e5ee471609848ee1ebf3beb2a46788113fe0eb.tar.gz linux-stable-81e5ee471609848ee1ebf3beb2a46788113fe0eb.tar.bz2 linux-stable-81e5ee471609848ee1ebf3beb2a46788113fe0eb.zip |
arm_pmu: acpi: Refactor arm_spe_acpi_register_device()
Sanity checking all the GICC tables for same interrupt number, and ensuring
a homogeneous ACPI based machine, could be used for other platform devices
as well. Hence this refactors arm_spe_acpi_register_device() into a common
helper arm_acpi_register_pmu_device().
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
Co-developed-by: Will Deacon <will@kernel.org>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20230817055405.249630-2-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 | 104 |
1 files changed, 64 insertions, 40 deletions
diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c index 90815ad762eb..48bd62d3993e 100644 --- a/drivers/perf/arm_pmu_acpi.c +++ b/drivers/perf/arm_pmu_acpi.c @@ -69,6 +69,62 @@ static void arm_pmu_acpi_unregister_irq(int cpu) acpi_unregister_gsi(gsi); } +static int __maybe_unused +arm_acpi_register_pmu_device(struct platform_device *pdev, u8 len, + u16 (*parse_gsi)(struct acpi_madt_generic_interrupt *)) +{ + int cpu, this_hetid, hetid, irq, ret; + u16 this_gsi = 0, gsi = 0; + + /* + * Ensure that platform device must have IORESOURCE_IRQ + * resource to hold gsi interrupt. + */ + if (pdev->num_resources != 1) + return -ENXIO; + + if (pdev->resource[0].flags != IORESOURCE_IRQ) + return -ENXIO; + + /* + * Sanity check all the GICC tables for the same interrupt + * number. For now, only support homogeneous ACPI machines. + */ + for_each_possible_cpu(cpu) { + struct acpi_madt_generic_interrupt *gicc; + + gicc = acpi_cpu_get_madt_gicc(cpu); + if (gicc->header.length < len) + return gsi ? -ENXIO : 0; + + this_gsi = parse_gsi(gicc); + this_hetid = find_acpi_cpu_topology_hetero_id(cpu); + if (!gsi) { + hetid = this_hetid; + gsi = this_gsi; + } else if (hetid != this_hetid || gsi != this_gsi) { + pr_warn("ACPI: %s: must be homogeneous\n", pdev->name); + return -ENXIO; + } + } + + if (!this_gsi) + return 0; + + irq = acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH); + if (irq < 0) { + pr_warn("ACPI: %s Unable to register interrupt: %d\n", pdev->name, gsi); + return -ENXIO; + } + + pdev->resource[0].start = irq; + ret = platform_device_register(pdev); + if (ret) + acpi_unregister_gsi(gsi); + + return ret; +} + #if IS_ENABLED(CONFIG_ARM_SPE_PMU) static struct resource spe_resources[] = { { @@ -84,6 +140,11 @@ static struct platform_device spe_dev = { .num_resources = ARRAY_SIZE(spe_resources) }; +static u16 arm_spe_parse_gsi(struct acpi_madt_generic_interrupt *gicc) +{ + return gicc->spe_interrupt; +} + /* * For lack of a better place, hook the normal PMU MADT walk * and create a SPE device if we detect a recent MADT with @@ -91,47 +152,10 @@ static struct platform_device spe_dev = { */ 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) { + int ret = arm_acpi_register_pmu_device(&spe_dev, ACPI_MADT_GICC_SPE, + arm_spe_parse_gsi); + if (ret) pr_warn("ACPI: SPE: Unable to register device\n"); - acpi_unregister_gsi(gsi); - } } #else static inline void arm_spe_acpi_register_device(void) |