From patchwork Mon Aug 10 13:20:57 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 6984121 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A7005C05AC for ; Mon, 10 Aug 2015 13:25:35 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B94DA2074B for ; Mon, 10 Aug 2015 13:25:34 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E2CDB205FF for ; Mon, 10 Aug 2015 13:25:33 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZOn2N-0000t4-Ct; Mon, 10 Aug 2015 13:22:47 +0000 Received: from mail-wi0-f178.google.com ([209.85.212.178]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZOn1s-0000Zk-AP for linux-arm-kernel@lists.infradead.org; Mon, 10 Aug 2015 13:22:19 +0000 Received: by wicja10 with SMTP id ja10so25455979wic.1 for ; Mon, 10 Aug 2015 06:21:56 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=tyKvBCvy0IzzEnkus/pMAYL3inZuMuSbASKxoxNl3BE=; b=QljMpeMbps4s6L5UZRaJCguwVwm3dnvJbwugQ/vaVS9603SP5e1nE1Bcu1RVVe2MS8 BtPiY0d3nWDvfk2ziFjOItqIaXl6GFS9uPffPjabRqRKUmGqRDg3imK3AjVErBrreWc9 YMW0n5um9XDkxvQcQsxGiXs+2bmO8FdXnobnAY5FmZE3wXPKb9WOqN/sb3aM46tU5mt2 obHYQPGPH67gaVbX3CKgRHKn851IMxUbABVMKVgjvM1sAmvzDhbcpVjwXLzhr/t+c1xe 1MmsYlp3MvKXSKYO89UZkKcm0y/yYh/hropxK+PaJZNFdN3cDBgmktVUpnUGsButjpNT u86A== X-Gm-Message-State: ALoCoQkX2raLckAJihqQe8fPc2aUgjqU6umewUG8/mY7POmc4P6FmmaKnrx/1PUWY/zuffaYwhEj X-Received: by 10.194.63.20 with SMTP id c20mr48509959wjs.134.1439212916550; Mon, 10 Aug 2015 06:21:56 -0700 (PDT) Received: from gnx2579.home (LCaen-156-56-7-90.w80-11.abo.wanadoo.fr. [80.11.198.90]) by smtp.gmail.com with ESMTPSA id fq15sm29517024wjc.12.2015.08.10.06.21.54 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 10 Aug 2015 06:21:55 -0700 (PDT) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, christoffer.dall@linaro.org, marc.zyngier@arm.com, alex.williamson@redhat.com, feng.wu@intel.com Subject: [PATCH v3 03/10] VFIO: platform: single handler using function pointer Date: Mon, 10 Aug 2015 15:20:57 +0200 Message-Id: <1439212864-12954-4-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439212864-12954-1-git-send-email-eric.auger@linaro.org> References: <1439212864-12954-1-git-send-email-eric.auger@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150810_062216_690184_B009A26F X-CRM114-Status: GOOD ( 14.52 ) 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: pbonzini@redhat.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=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, 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 A single handler now is registered whatever the use case: automasked or not. A function pointer is set according to the wished behavior and the handler calls this function. The irq lock is taken/released in the root handler. eventfd_signal can be called in regions not allowed to sleep. Signed-off-by: Eric Auger --- v4: creation --- drivers/vfio/platform/vfio_platform_irq.c | 21 +++++++++++++++------ drivers/vfio/platform/vfio_platform_private.h | 1 + 2 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c index 40f057a..b31b1f0 100644 --- a/drivers/vfio/platform/vfio_platform_irq.c +++ b/drivers/vfio/platform/vfio_platform_irq.c @@ -148,11 +148,8 @@ static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev, static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id) { struct vfio_platform_irq *irq_ctx = dev_id; - unsigned long flags; int ret = IRQ_NONE; - spin_lock_irqsave(&irq_ctx->lock, flags); - if (!irq_ctx->masked) { ret = IRQ_HANDLED; @@ -161,8 +158,6 @@ static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id) irq_ctx->masked = true; } - spin_unlock_irqrestore(&irq_ctx->lock, flags); - if (ret == IRQ_HANDLED) eventfd_signal(irq_ctx->trigger, 1); @@ -178,6 +173,19 @@ static irqreturn_t vfio_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +static irqreturn_t vfio_handler(int irq, void *dev_id) +{ + struct vfio_platform_irq *irq_ctx = dev_id; + unsigned long flags; + irqreturn_t ret; + + spin_lock_irqsave(&irq_ctx->lock, flags); + ret = irq_ctx->handler(irq, dev_id); + spin_unlock_irqrestore(&irq_ctx->lock, flags); + + return ret; +} + static void vfio_platform_irq_bypass_stop(struct irq_bypass_producer *prod) { } @@ -229,9 +237,10 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index, } irq->trigger = trigger; + irq->handler = handler; irq_set_status_flags(irq->hwirq, IRQ_NOAUTOEN); - ret = request_irq(irq->hwirq, handler, 0, irq->name, irq); + ret = request_irq(irq->hwirq, vfio_handler, 0, irq->name, irq); if (ret) { kfree(irq->name); eventfd_ctx_put(trigger); diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 8b4f814..f848a6b 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -40,6 +40,7 @@ struct vfio_platform_irq { struct virqfd *mask; struct irq_bypass_producer producer; bool forwarded; + irqreturn_t (*handler)(int irq, void *dev_id); }; struct vfio_platform_region {