From patchwork Thu Sep 7 02:16:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu-Chien Peter Lin X-Patchwork-Id: 13376088 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3447DEE14A9 for ; Thu, 7 Sep 2023 02:19:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=bmh0Pm3HQrYZ4PgmQJ5Mr7XLIVgAwrLPysEMUd7kVPE=; b=nc62B1JQGh0IQJ daI79xqSwu81e/BNQ5Psl65zdBfbvHwJiJkpp8ElTZAea/Eo/NtxttyA/bYMrU1g/FUOBMxk10G5U 3WwR7RFmJdDQEiMtOuaKnK0IGdhe7PVQZ+4hzqF9yefRM2W14dmsHa+gxKQf3hLOohBPP6D4n7paV 4TvQtiBL4jmuA0hQ4VJ8vNqs9giYAKkZqZRa/h9fCzNUE4I9ro5WAhGXTl0bXC/MFXx6cvVa4ddhb JcRGsna1nNJmVbm3Y6Mc6mkeaFHfZla3SmRHIDZ+8AxKYAnlBLti+3fpAp6J/j2FUr/Q25PnFa57j wtVBjSk8BgUE2Ut6Ceyg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qe4bb-00BBKj-2O; Thu, 07 Sep 2023 02:18:51 +0000 Received: from 60-248-80-70.hinet-ip.hinet.net ([60.248.80.70] helo=Atcsqr.andestech.com) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qe4bV-00BBI7-1f; Thu, 07 Sep 2023 02:18:47 +0000 Received: from mail.andestech.com (ATCPCS16.andestech.com [10.0.1.222]) by Atcsqr.andestech.com with ESMTP id 3872IKK1024147; Thu, 7 Sep 2023 10:18:20 +0800 (+08) (envelope-from peterlin@andestech.com) Received: from swlinux02.andestech.com (10.0.15.183) by ATCPCS16.andestech.com (10.0.1.222) with Microsoft SMTP Server id 14.3.498.0; Thu, 7 Sep 2023 10:18:15 +0800 From: Yu Chien Peter Lin To: , , , , , , , , , , CC: , , , , , , , , , , Yu Chien Peter Lin Subject: [PATCH 3/4] riscv: errata: Add Andes PMU errata Date: Thu, 7 Sep 2023 10:16:34 +0800 Message-ID: <20230907021635.1002738-4-peterlin@andestech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230907021635.1002738-1-peterlin@andestech.com> References: <20230907021635.1002738-1-peterlin@andestech.com> MIME-Version: 1.0 X-Originating-IP: [10.0.15.183] X-DNSRBL: X-MAIL: Atcsqr.andestech.com 3872IKK1024147 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230906_191845_999610_7FE8636C X-CRM114-Status: GOOD ( 20.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Before the ratification of Sscofpmf, the Andes PMU extension implements the same mechanism and is compatible with existing SBI PMU driver of perf to support event sampling and mode filtering with programmable hardware performance counters. This patch adds PMU support for Andes 45-series CPUs by introducing a CPU errata. Signed-off-by: Yu Chien Peter Lin Signed-off-by: Locus Wei-Han Chen Reviewed-by: Charles Ci-Jyun Wu Reviewed-by: Leo Yu-Chi Liang --- arch/riscv/Kconfig.errata | 13 ++++++++ arch/riscv/errata/andes/errata.c | 45 +++++++++++++++++++++++++++- arch/riscv/include/asm/errata_list.h | 43 ++++++++++++++++++++++++-- drivers/perf/riscv_pmu_sbi.c | 20 +++++++++---- 4 files changed, 111 insertions(+), 10 deletions(-) diff --git a/arch/riscv/Kconfig.errata b/arch/riscv/Kconfig.errata index 92c779764b27..a342b209c169 100644 --- a/arch/riscv/Kconfig.errata +++ b/arch/riscv/Kconfig.errata @@ -21,6 +21,19 @@ config ERRATA_ANDES_CMO If you don't know what to do here, say "Y". +config ERRATA_ANDES_PMU + bool "Apply Andes PMU errata" + depends on ERRATA_ANDES && RISCV_PMU_SBI + default y + help + The Andes 45-series cores implement a PMU overflow extension + very similar to the core SSCOFPMF extension. + + This will apply the overflow errata to handle the non-standard + behaviour via the regular SBI PMU driver and interface. + + If you don't know what to do here, say "Y". + config ERRATA_SIFIVE bool "SiFive errata" depends on RISCV_ALTERNATIVE diff --git a/arch/riscv/errata/andes/errata.c b/arch/riscv/errata/andes/errata.c index d2e1abcac967..19256691f1ba 100644 --- a/arch/riscv/errata/andes/errata.c +++ b/arch/riscv/errata/andes/errata.c @@ -56,11 +56,54 @@ static bool errata_probe_iocp(unsigned int stage, unsigned long arch_id, unsigne return true; } +static bool errata_probe_pmu(unsigned int stage, + unsigned long arch_id, unsigned long impid) +{ + if (!IS_ENABLED(CONFIG_ERRATA_ANDES_PMU)) + return false; + + if ((arch_id & 0xff) != 0x45) + return false; + + if (stage == RISCV_ALTERNATIVES_EARLY_BOOT) + return false; + + return true; +} + +static u32 andes_errata_probe(unsigned int stage, + unsigned long archid, unsigned long impid) +{ + u32 cpu_req_errata = 0; + + if (errata_probe_pmu(stage, archid, impid)) + cpu_req_errata |= BIT(ERRATA_ANDES_PMU); + + return cpu_req_errata; +} + void __init_or_module andes_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, unsigned long archid, unsigned long impid, unsigned int stage) { + struct alt_entry *alt; + u32 cpu_req_errata = andes_errata_probe(stage, archid, impid); + u32 tmp; + errata_probe_iocp(stage, archid, impid); - /* we have nothing to patch here ATM so just return back */ + for (alt = begin; alt < end; alt++) { + if (alt->vendor_id != ANDES_VENDOR_ID) + continue; + if (alt->patch_id >= ERRATA_ANDES_NUMBER) + continue; + + tmp = (1U << alt->patch_id); + if (cpu_req_errata & tmp) { + mutex_lock(&text_mutex); + patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt), + alt->alt_len); + mutex_unlock(&text_mutex); + } + } } diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h index 56ab40e64092..bb4c276e2c7f 100644 --- a/arch/riscv/include/asm/errata_list.h +++ b/arch/riscv/include/asm/errata_list.h @@ -13,7 +13,8 @@ #ifdef CONFIG_ERRATA_ANDES #define ERRATA_ANDES_NO_IOCP 0 -#define ERRATA_ANDES_NUMBER 1 +#define ERRATA_ANDES_PMU 1 +#define ERRATA_ANDES_NUMBER 2 #endif #ifdef CONFIG_ERRATA_SIFIVE @@ -150,15 +151,51 @@ asm volatile(ALTERNATIVE_2( \ #define THEAD_C9XX_RV_IRQ_PMU 17 #define THEAD_C9XX_CSR_SCOUNTEROF 0x5c5 +#define ANDES_RV_IRQ_PMU 18 +#define ANDES_SLI_CAUSE_BASE 256 +#define ANDES_CSR_SCOUNTEROF 0x9d4 +#define ANDES_CSR_SLIE 0x9c4 +#define ANDES_CSR_SLIP 0x9c5 + #define ALT_SBI_PMU_OVERFLOW(__ovl) \ -asm volatile(ALTERNATIVE( \ +asm volatile(ALTERNATIVE_2( \ "csrr %0, " __stringify(CSR_SSCOUNTOVF), \ "csrr %0, " __stringify(THEAD_C9XX_CSR_SCOUNTEROF), \ THEAD_VENDOR_ID, ERRATA_THEAD_PMU, \ - CONFIG_ERRATA_THEAD_PMU) \ + CONFIG_ERRATA_THEAD_PMU, \ + "csrr %0, " __stringify(ANDES_CSR_SCOUNTEROF), \ + ANDES_VENDOR_ID, ERRATA_ANDES_PMU, \ + CONFIG_ERRATA_ANDES_PMU) \ : "=r" (__ovl) : \ : "memory") +#define ALT_SBI_PMU_OVF_CLEAR_PENDING(__irq_num) \ +asm volatile(ALTERNATIVE( \ + "csrc " __stringify(CSR_IP) ", %0\n\t", \ + "csrc " __stringify(ANDES_CSR_SLIP) ", %0\n\t", \ + ANDES_VENDOR_ID, ERRATA_ANDES_PMU, \ + CONFIG_ERRATA_ANDES_PMU) \ + : : "r"(BIT(__irq_num)) \ + : "memory") + +#define ALT_SBI_PMU_OVF_DISABLE(__irq_num) \ +asm volatile(ALTERNATIVE( \ + "csrc " __stringify(CSR_IE) ", %0\n\t", \ + "csrc " __stringify(ANDES_CSR_SLIE) ", %0\n\t", \ + ANDES_VENDOR_ID, ERRATA_ANDES_PMU, \ + CONFIG_ERRATA_ANDES_PMU) \ + : : "r"(BIT(__irq_num)) \ + : "memory") + +#define ALT_SBI_PMU_OVF_ENABLE(__irq_num) \ +asm volatile(ALTERNATIVE( \ + "csrs " __stringify(CSR_IE) ", %0\n\t", \ + "csrs " __stringify(ANDES_CSR_SLIE) ", %0\n\t", \ + ANDES_VENDOR_ID, ERRATA_ANDES_PMU, \ + CONFIG_ERRATA_ANDES_PMU) \ + : : "r"(BIT(__irq_num)) \ + : "memory") + #endif /* __ASSEMBLY__ */ #endif diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index 9a51053b1f99..8b67f202d2ae 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -687,7 +687,7 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev) fidx = find_first_bit(cpu_hw_evt->used_hw_ctrs, RISCV_MAX_COUNTERS); event = cpu_hw_evt->events[fidx]; if (!event) { - csr_clear(CSR_SIP, BIT(riscv_pmu_irq_num)); + ALT_SBI_PMU_OVF_CLEAR_PENDING(riscv_pmu_irq_num); return IRQ_NONE; } @@ -701,7 +701,7 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev) * Overflow interrupt pending bit should only be cleared after stopping * all the counters to avoid any race condition. */ - csr_clear(CSR_SIP, BIT(riscv_pmu_irq_num)); + ALT_SBI_PMU_OVF_CLEAR_PENDING(riscv_pmu_irq_num); /* No overflow bit is set */ if (!overflow) @@ -773,8 +773,8 @@ static int pmu_sbi_starting_cpu(unsigned int cpu, struct hlist_node *node) if (riscv_pmu_use_irq) { cpu_hw_evt->irq = riscv_pmu_irq; - csr_clear(CSR_IP, BIT(riscv_pmu_irq_num)); - csr_set(CSR_IE, BIT(riscv_pmu_irq_num)); + ALT_SBI_PMU_OVF_CLEAR_PENDING(riscv_pmu_irq_num); + ALT_SBI_PMU_OVF_ENABLE(riscv_pmu_irq_num); enable_percpu_irq(riscv_pmu_irq, IRQ_TYPE_NONE); } @@ -785,7 +785,7 @@ static int pmu_sbi_dying_cpu(unsigned int cpu, struct hlist_node *node) { if (riscv_pmu_use_irq) { disable_percpu_irq(riscv_pmu_irq); - csr_clear(CSR_IE, BIT(riscv_pmu_irq_num)); + ALT_SBI_PMU_OVF_DISABLE(riscv_pmu_irq_num); } /* Disable all counters access for user mode now */ @@ -809,6 +809,10 @@ static int pmu_sbi_setup_irqs(struct riscv_pmu *pmu, struct platform_device *pde riscv_cached_mimpid(0) == 0) { riscv_pmu_irq_num = THEAD_C9XX_RV_IRQ_PMU; riscv_pmu_use_irq = true; + } else if (IS_ENABLED(CONFIG_ERRATA_ANDES_PMU) && + riscv_cached_mvendorid(0) == ANDES_VENDOR_ID) { + riscv_pmu_irq_num = ANDES_RV_IRQ_PMU; + riscv_pmu_use_irq = true; } if (!riscv_pmu_use_irq) @@ -821,7 +825,11 @@ static int pmu_sbi_setup_irqs(struct riscv_pmu *pmu, struct platform_device *pde return -ENODEV; } - riscv_pmu_irq = irq_create_mapping(domain, riscv_pmu_irq_num); + if (IS_ENABLED(CONFIG_ERRATA_ANDES_PMU)) + riscv_pmu_irq = irq_create_mapping( + domain, ANDES_SLI_CAUSE_BASE + riscv_pmu_irq_num); + else + riscv_pmu_irq = irq_create_mapping(domain, riscv_pmu_irq_num); if (!riscv_pmu_irq) { pr_err("Failed to map PMU interrupt for node\n"); return -ENODEV;