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Wed, 05 Feb 2025 08:00:32 -0800 (PST) From: Anup Patel To: Thomas Gleixner Subject: [PATCH v4 05/11] genirq: Introduce irq_can_move_in_process_context() Date: Wed, 5 Feb 2025 21:29:41 +0530 Message-ID: <20250205155948.81385-6-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250205155948.81385-1-apatel@ventanamicro.com> References: <20250205155948.81385-1-apatel@ventanamicro.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250205_080033_709885_B8A40F98 X-CRM114-Status: UNSURE ( 9.57 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anup Patel , Andrew Lunn , imx@lists.linux.dev, Marc Zyngier , Sascha Hauer , Atish Patra , linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Palmer Dabbelt , Pengutronix Kernel Team , Paul Walmsley , Anup Patel , Andrew Jones , Shawn Guo , Gregory Clement , linux-arm-kernel@lists.infradead.org, Sebastian Hesselbarth Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org The interrupt controller drivers which use GENERIC_PENDING_IRQ can move interrupts in process context for downstrean devices which support atomic MSI configuration. Introduce irq_can_move_in_process_context() which allows interrupt controller drivers to test whether a particular interrupt can be moved process context. Signed-off-by: Anup Patel --- include/linux/irq.h | 2 ++ kernel/irq/migration.c | 11 +++++++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 1884fa4ec9b5..5b67a47da144 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -617,6 +617,7 @@ extern int irq_affinity_online_cpu(unsigned int cpu); #endif #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ) +bool irq_can_move_in_process_context(struct irq_data *data); void __irq_move_irq(struct irq_data *data); static inline void irq_move_irq(struct irq_data *data) { @@ -626,6 +627,7 @@ static inline void irq_move_irq(struct irq_data *data) void irq_move_masked_irq(struct irq_data *data); void irq_force_complete_move(struct irq_desc *desc); #else +static inline bool irq_can_move_in_process_context(struct irq_data *data) { return true; } static inline void irq_move_irq(struct irq_data *data) { } static inline void irq_move_masked_irq(struct irq_data *data) { } static inline void irq_force_complete_move(struct irq_desc *desc) { } diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c index 2920024475a3..428e42d3bc91 100644 --- a/kernel/irq/migration.c +++ b/kernel/irq/migration.c @@ -126,3 +126,14 @@ void __irq_move_irq(struct irq_data *idata) if (!masked) idata->chip->irq_unmask(idata); } + +bool irq_can_move_in_process_context(struct irq_data *data) +{ + /* + * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled, + * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is + * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here. + */ + data = irq_desc_get_irq_data(irq_data_to_desc(data)); + return irq_can_move_pcntxt(data); +}