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Fri, 24 Sep 2021 06:29:06 -0700 (PDT) From: Pingfan Liu To: linux-arm-kernel@lists.infradead.org Cc: Pingfan Liu , Catalin Marinas , Will Deacon , Mark Rutland , Marc Zyngier , Joey Gouly , Sami Tolvanen , Julien Thierry , Thomas Gleixner , Yuichi Ito , linux-kernel@vger.kernel.org Subject: [PATCHv2 2/5] irqchip/GICv3: expose handle_nmi() directly Date: Fri, 24 Sep 2021 21:28:34 +0800 Message-Id: <20210924132837.45994-3-kernelfans@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210924132837.45994-1-kernelfans@gmail.com> References: <20210924132837.45994-1-kernelfans@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210924_062908_144206_AF59B731 X-CRM114-Status: GOOD ( 18.12 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org With the previous patch, the NMI should be dispatched at irqentry level. Accordingly adjust GICv3 to utilize the hooks, so NMI handler can be dispatched. Signed-off-by: Pingfan Liu Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: Marc Zyngier Cc: Joey Gouly Cc: Sami Tolvanen Cc: Julien Thierry Cc: Thomas Gleixner Cc: Yuichi Ito Cc: linux-kernel@vger.kernel.org To: linux-arm-kernel@lists.infradead.org --- arch/arm64/include/asm/irq.h | 2 ++ drivers/irqchip/irq-gic-v3.c | 53 +++++++++++++++++++----------------- 2 files changed, 30 insertions(+), 25 deletions(-) diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h index a59b1745f458..c39627290a60 100644 --- a/arch/arm64/include/asm/irq.h +++ b/arch/arm64/include/asm/irq.h @@ -11,6 +11,8 @@ struct pt_regs; int set_handle_irq(void (*handle_irq)(struct pt_regs *)); #define set_handle_irq set_handle_irq int set_handle_fiq(void (*handle_fiq)(struct pt_regs *)); +int set_handle_nmi(void (*handle_nmi)(struct pt_regs *)); +int set_nmi_discriminator(bool (*discriminator)(void)); extern void (*handle_arch_irq)(struct pt_regs *regs); extern void (*handle_arch_fiq)(struct pt_regs *regs); diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index fd4e9a37fea6..89dcec902a82 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -644,28 +644,12 @@ static void gic_deactivate_unhandled(u32 irqnr) } } -static inline void gic_handle_nmi(u32 irqnr, struct pt_regs *regs) +static bool gic_is_in_nmi(void) { - bool irqs_enabled = interrupts_enabled(regs); - int err; - - if (irqs_enabled) - nmi_enter(); - - if (static_branch_likely(&supports_deactivate_key)) - gic_write_eoir(irqnr); - /* - * Leave the PSR.I bit set to prevent other NMIs to be - * received while handling this one. - * PSR.I will be restored when we ERET to the - * interrupted context. - */ - err = handle_domain_nmi(gic_data.domain, irqnr, regs); - if (err) - gic_deactivate_unhandled(irqnr); + if (gic_supports_nmi() && unlikely(gic_read_rpr() == GICD_INT_NMI_PRI)) + return true; - if (irqs_enabled) - nmi_exit(); + return false; } static u32 do_read_iar(struct pt_regs *regs) @@ -702,21 +686,38 @@ static u32 do_read_iar(struct pt_regs *regs) return iar; } -static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) +static void gic_handle_nmi(struct pt_regs *regs) { u32 irqnr; + int err; irqnr = do_read_iar(regs); /* Check for special IDs first */ if ((irqnr >= 1020 && irqnr <= 1023)) return; + if (static_branch_likely(&supports_deactivate_key)) + gic_write_eoir(irqnr); + /* + * Leave the PSR.I bit set to prevent other NMIs to be + * received while handling this one. + * PSR.I will be restored when we ERET to the + * interrupted context. + */ + err = handle_domain_nmi(gic_data.domain, irqnr, regs); + if (err) + gic_deactivate_unhandled(irqnr); +} - if (gic_supports_nmi() && - unlikely(gic_read_rpr() == GICD_INT_RPR_PRI(GICD_INT_NMI_PRI))) { - gic_handle_nmi(irqnr, regs); +static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) +{ + u32 irqnr; + + irqnr = do_read_iar(regs); + + /* Check for special IDs first */ + if ((irqnr >= 1020 && irqnr <= 1023)) return; - } if (gic_prio_masking_enabled()) { gic_pmr_mask_irqs(); @@ -1791,6 +1792,8 @@ static int __init gic_init_bases(void __iomem *dist_base, } set_handle_irq(gic_handle_irq); + set_handle_nmi(gic_handle_nmi); + set_nmi_discriminator(gic_is_in_nmi); gic_update_rdist_properties(); -- 2.31.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF954C433FE for ; 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Fri, 24 Sep 2021 06:29:06 -0700 (PDT) Received: from piliu.users.ipa.redhat.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 26sm11756573pgx.72.2021.09.24.06.28.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Sep 2021 06:29:06 -0700 (PDT) From: Pingfan Liu To: linux-arm-kernel@lists.infradead.org Cc: Pingfan Liu , Catalin Marinas , Will Deacon , Mark Rutland , Marc Zyngier , Joey Gouly , Sami Tolvanen , Julien Thierry , Thomas Gleixner , Yuichi Ito , linux-kernel@vger.kernel.org Subject: [PATCHv2 2/5] irqchip/GICv3: expose handle_nmi() directly Date: Fri, 24 Sep 2021 21:28:34 +0800 Message-Id: <20210924132837.45994-3-kernelfans@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210924132837.45994-1-kernelfans@gmail.com> References: <20210924132837.45994-1-kernelfans@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With the previous patch, the NMI should be dispatched at irqentry level. Accordingly adjust GICv3 to utilize the hooks, so NMI handler can be dispatched. Signed-off-by: Pingfan Liu Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: Marc Zyngier Cc: Joey Gouly Cc: Sami Tolvanen Cc: Julien Thierry Cc: Thomas Gleixner Cc: Yuichi Ito Cc: linux-kernel@vger.kernel.org To: linux-arm-kernel@lists.infradead.org --- arch/arm64/include/asm/irq.h | 2 ++ drivers/irqchip/irq-gic-v3.c | 53 +++++++++++++++++++----------------- 2 files changed, 30 insertions(+), 25 deletions(-) diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h index a59b1745f458..c39627290a60 100644 --- a/arch/arm64/include/asm/irq.h +++ b/arch/arm64/include/asm/irq.h @@ -11,6 +11,8 @@ struct pt_regs; int set_handle_irq(void (*handle_irq)(struct pt_regs *)); #define set_handle_irq set_handle_irq int set_handle_fiq(void (*handle_fiq)(struct pt_regs *)); +int set_handle_nmi(void (*handle_nmi)(struct pt_regs *)); +int set_nmi_discriminator(bool (*discriminator)(void)); extern void (*handle_arch_irq)(struct pt_regs *regs); extern void (*handle_arch_fiq)(struct pt_regs *regs); diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index fd4e9a37fea6..89dcec902a82 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -644,28 +644,12 @@ static void gic_deactivate_unhandled(u32 irqnr) } } -static inline void gic_handle_nmi(u32 irqnr, struct pt_regs *regs) +static bool gic_is_in_nmi(void) { - bool irqs_enabled = interrupts_enabled(regs); - int err; - - if (irqs_enabled) - nmi_enter(); - - if (static_branch_likely(&supports_deactivate_key)) - gic_write_eoir(irqnr); - /* - * Leave the PSR.I bit set to prevent other NMIs to be - * received while handling this one. - * PSR.I will be restored when we ERET to the - * interrupted context. - */ - err = handle_domain_nmi(gic_data.domain, irqnr, regs); - if (err) - gic_deactivate_unhandled(irqnr); + if (gic_supports_nmi() && unlikely(gic_read_rpr() == GICD_INT_NMI_PRI)) + return true; - if (irqs_enabled) - nmi_exit(); + return false; } static u32 do_read_iar(struct pt_regs *regs) @@ -702,21 +686,38 @@ static u32 do_read_iar(struct pt_regs *regs) return iar; } -static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) +static void gic_handle_nmi(struct pt_regs *regs) { u32 irqnr; + int err; irqnr = do_read_iar(regs); /* Check for special IDs first */ if ((irqnr >= 1020 && irqnr <= 1023)) return; + if (static_branch_likely(&supports_deactivate_key)) + gic_write_eoir(irqnr); + /* + * Leave the PSR.I bit set to prevent other NMIs to be + * received while handling this one. + * PSR.I will be restored when we ERET to the + * interrupted context. + */ + err = handle_domain_nmi(gic_data.domain, irqnr, regs); + if (err) + gic_deactivate_unhandled(irqnr); +} - if (gic_supports_nmi() && - unlikely(gic_read_rpr() == GICD_INT_RPR_PRI(GICD_INT_NMI_PRI))) { - gic_handle_nmi(irqnr, regs); +static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs) +{ + u32 irqnr; + + irqnr = do_read_iar(regs); + + /* Check for special IDs first */ + if ((irqnr >= 1020 && irqnr <= 1023)) return; - } if (gic_prio_masking_enabled()) { gic_pmr_mask_irqs(); @@ -1791,6 +1792,8 @@ static int __init gic_init_bases(void __iomem *dist_base, } set_handle_irq(gic_handle_irq); + set_handle_nmi(gic_handle_nmi); + set_nmi_discriminator(gic_is_in_nmi); gic_update_rdist_properties(); -- 2.31.1