From nobody Mon Feb 9 12:24:15 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D399FC0015E for ; Fri, 28 Jul 2023 11:28:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234990AbjG1L2I (ORCPT ); Fri, 28 Jul 2023 07:28:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34594 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235573AbjG1L17 (ORCPT ); Fri, 28 Jul 2023 07:27:59 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3D2652D5B for ; Fri, 28 Jul 2023 04:27:58 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 182BED75; Fri, 28 Jul 2023 04:28:41 -0700 (PDT) Received: from a077893.blr.arm.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 68B1F3F6C4; Fri, 28 Jul 2023 04:27:55 -0700 (PDT) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com Cc: Anshuman Khandual , Catalin Marinas , Will Deacon , Mark Rutland , linux-kernel@vger.kernel.org Subject: [PATCH 1/3] arm_pmu: acpi: Add a representative platform device for TRBE Date: Fri, 28 Jul 2023 16:57:31 +0530 Message-Id: <20230728112733.359620-2-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230728112733.359620-1-anshuman.khandual@arm.com> References: <20230728112733.359620-1-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 Cc: Will Deacon Cc: Mark Rutland Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/arm64/include/asm/acpi.h | 3 ++ drivers/perf/arm_pmu_acpi.c | 63 +++++++++++++++++++++++++++++++++++ include/linux/perf/arm_pmu.h | 1 + 3 files changed, 67 insertions(+) diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index bd68e1b7f29f..4d537d56eb84 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -42,6 +42,9 @@ #define ACPI_MADT_GICC_SPE (offsetof(struct acpi_madt_generic_interrupt, \ spe_interrupt) + sizeof(u16)) =20 +#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); diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c index 90815ad762eb..dd3df6729808 100644 --- a/drivers/perf/arm_pmu_acpi.c +++ b/drivers/perf/arm_pmu_acpi.c @@ -139,6 +139,68 @@ static inline void arm_spe_acpi_register_device(void) } #endif /* CONFIG_ARM_SPE_PMU */ =20 +#ifdef CONFIG_CORESIGHT_TRBE +static struct resource trbe_acpi_resources[] =3D { + { + /* irq */ + .flags =3D IORESOURCE_IRQ, + } +}; + +static struct platform_device trbe_acpi_dev =3D { + .name =3D ARMV8_TRBE_PDEV_NAME, + .id =3D -1, + .resource =3D trbe_acpi_resources, + .num_resources =3D ARRAY_SIZE(trbe_acpi_resources) +}; + +static void arm_trbe_acpi_register_device(void) +{ + int cpu, hetid, irq, ret; + bool first =3D true; + u16 gsi =3D 0; + + for_each_possible_cpu(cpu) { + struct acpi_madt_generic_interrupt *gicc; + + gicc =3D acpi_cpu_get_madt_gicc(cpu); + if (gicc->header.length < ACPI_MADT_GICC_TRBE) + return; + + if (first) { + gsi =3D gicc->trbe_interrupt; + if (!gsi) + return; + + hetid =3D find_acpi_cpu_topology_hetero_id(cpu); + first =3D false; + } else if ((gsi !=3D gicc->trbe_interrupt) || + (hetid !=3D find_acpi_cpu_topology_hetero_id(cpu))) { + pr_warn("ACPI: TRBE must be homogeneous\n"); + return; + } + } + + irq =3D acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HI= GH); + if (irq < 0) { + pr_warn("ACPI: TRBE Unable to register interrupt: %d\n", gsi); + return; + } + trbe_acpi_resources[0].start =3D irq; + + ret =3D platform_device_register(&trbe_acpi_dev); + if (ret < 0) { + pr_warn("ACPI: TRBE: Unable to register device\n"); + acpi_unregister_gsi(gsi); + } +} +#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; @@ -374,6 +436,7 @@ static int arm_pmu_acpi_init(void) return 0; =20 arm_spe_acpi_register_device(); + arm_trbe_acpi_register_device(); =20 return 0; } diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h index a0801f68762b..7ec26d21303d 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -187,5 +187,6 @@ void armpmu_free_irq(int irq, int cpu); #endif /* CONFIG_ARM_PMU */ =20 #define ARMV8_SPE_PDEV_NAME "arm,spe-v1" +#define ARMV8_TRBE_PDEV_NAME "arm-trbe-acpi" =20 #endif /* __ARM_PMU_H__ */ --=20 2.25.1