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[80.11.198.90]) by smtp.gmail.com with ESMTPSA id h67sm34493865wmf.17.2015.11.19.06.54.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 19 Nov 2015 06:54:12 -0800 (PST) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, alex.williamson@redhat.com, b.reynal@virtualopensystems.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH v4 02/13] VFIO: platform: registration of a dummy IRQ bypass producer Date: Thu, 19 Nov 2015 14:53:52 +0000 Message-Id: <1447944843-17731-3-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1447944843-17731-1-git-send-email-eric.auger@linaro.org> References: <1447944843-17731-1-git-send-email-eric.auger@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151119_065435_444770_99A517A1 X-CRM114-Status: GOOD ( 13.01 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: andre.przywara@arm.com, linux-kernel@vger.kernel.org, patches@linaro.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Register a dummy producer with void callbacks Signed-off-by: Eric Auger --- v3 -> v3: - replace WARN_ON by pr_info() in case irq_bypass_register_producer fails v2 -> v3: - rename vfio_platform_irq_bypass_resume into *_start --- drivers/vfio/platform/vfio_platform_irq.c | 34 +++++++++++++++++++++++++++ drivers/vfio/platform/vfio_platform_private.h | 2 ++ 2 files changed, 36 insertions(+) diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c index 46d4750..ab7658a 100644 --- a/drivers/vfio/platform/vfio_platform_irq.c +++ b/drivers/vfio/platform/vfio_platform_irq.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "vfio_platform_private.h" @@ -177,6 +178,27 @@ static irqreturn_t vfio_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +static void vfio_platform_irq_bypass_stop(struct irq_bypass_producer *prod) +{ +} + +static void vfio_platform_irq_bypass_start(struct irq_bypass_producer *prod) +{ +} + +static int vfio_platform_irq_bypass_add_consumer( + struct irq_bypass_producer *prod, + struct irq_bypass_consumer *cons) +{ + return 0; +} + +static void vfio_platform_irq_bypass_del_consumer( + struct irq_bypass_producer *prod, + struct irq_bypass_consumer *cons) +{ +} + static int vfio_set_trigger(struct vfio_platform_device *vdev, int index, int fd, irq_handler_t handler) { @@ -187,6 +209,7 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index, if (irq->trigger) { irq_clear_status_flags(irq->hwirq, IRQ_NOAUTOEN); free_irq(irq->hwirq, irq); + irq_bypass_unregister_producer(&irq->producer); kfree(irq->name); eventfd_ctx_put(irq->trigger); irq->trigger = NULL; @@ -217,6 +240,17 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index, return ret; } + irq->producer.token = (void *)trigger; + irq->producer.irq = irq->hwirq; + irq->producer.add_consumer = vfio_platform_irq_bypass_add_consumer; + irq->producer.del_consumer = vfio_platform_irq_bypass_del_consumer; + irq->producer.stop = vfio_platform_irq_bypass_stop; + irq->producer.start = vfio_platform_irq_bypass_start; + ret = irq_bypass_register_producer(&irq->producer); + if (ret) + pr_info("irq bypass producer (token %p) registration fails: %d\n", + irq->producer.token, ret); + if (!irq->masked) enable_irq(irq->hwirq); diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 42816dd..979c191 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -17,6 +17,7 @@ #include #include +#include #define VFIO_PLATFORM_OFFSET_SHIFT 40 #define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1) @@ -37,6 +38,7 @@ struct vfio_platform_irq { spinlock_t lock; struct virqfd *unmask; struct virqfd *mask; + struct irq_bypass_producer producer; }; struct vfio_platform_region {