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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED,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 DCE2AC31E40 for ; Tue, 6 Aug 2019 14:18:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE098214C6 for ; Tue, 6 Aug 2019 14:18:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733006AbfHFOSq (ORCPT ); Tue, 6 Aug 2019 10:18:46 -0400 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:46735 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732935AbfHFOSq (ORCPT ); Tue, 6 Aug 2019 10:18:46 -0400 Received: from Internal Mail-Server by MTLPINE2 (envelope-from parav@mellanox.com) with ESMTPS (AES256-SHA encrypted); 6 Aug 2019 17:18:40 +0300 Received: from sw-mtx-036.mtx.labs.mlnx (sw-mtx-036.mtx.labs.mlnx [10.12.150.149]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id x76EIa7i019368; Tue, 6 Aug 2019 17:18:38 +0300 From: Parav Pandit To: kvm@vger.kernel.org, wankhede@nvidia.com, linux-kernel@vger.kernel.org Cc: parav@mellanox.com, alex.williamson@redhat.com, cohuck@redhat.com, cjia@nvidia.com Subject: [PATCH v1 1/2] vfio-mdev/mtty: Simplify interrupt generation Date: Tue, 6 Aug 2019 09:18:25 -0500 Message-Id: <20190806141826.52712-2-parav@mellanox.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190806141826.52712-1-parav@mellanox.com> References: <20190802065905.45239-1-parav@mellanox.com> <20190806141826.52712-1-parav@mellanox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org While generating interrupt, mdev_state is already available for which interrupt is generated. Instead of doing indirect way from state->device->uuid-> to searching state linearly in linked list on every interrupt generation, directly use the available state. Hence, simplify the code to use mdev_state and remove unused helper function with that. Reviewed-by: Cornelia Huck Signed-off-by: Parav Pandit --- samples/vfio-mdev/mtty.c | 39 ++++++++------------------------------- 1 file changed, 8 insertions(+), 31 deletions(-) diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index 92e770a06ea2..ce84a300a4da 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -152,20 +152,9 @@ static const struct file_operations vd_fops = { /* function prototypes */ -static int mtty_trigger_interrupt(const guid_t *uuid); +static int mtty_trigger_interrupt(struct mdev_state *mdev_state); /* Helper functions */ -static struct mdev_state *find_mdev_state_by_uuid(const guid_t *uuid) -{ - struct mdev_state *mds; - - list_for_each_entry(mds, &mdev_devices_list, next) { - if (guid_equal(mdev_uuid(mds->mdev), uuid)) - return mds; - } - - return NULL; -} static void dump_buffer(u8 *buf, uint32_t count) { @@ -337,8 +326,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state, pr_err("Serial port %d: Fifo level trigger\n", index); #endif - mtty_trigger_interrupt( - mdev_uuid(mdev_state->mdev)); + mtty_trigger_interrupt(mdev_state); } } else { #if defined(DEBUG_INTR) @@ -352,8 +340,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state, */ if (mdev_state->s[index].uart_reg[UART_IER] & UART_IER_RLSI) - mtty_trigger_interrupt( - mdev_uuid(mdev_state->mdev)); + mtty_trigger_interrupt(mdev_state); } mutex_unlock(&mdev_state->rxtx_lock); break; @@ -372,8 +359,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state, pr_err("Serial port %d: IER_THRI write\n", index); #endif - mtty_trigger_interrupt( - mdev_uuid(mdev_state->mdev)); + mtty_trigger_interrupt(mdev_state); } mutex_unlock(&mdev_state->rxtx_lock); @@ -444,7 +430,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state, #if defined(DEBUG_INTR) pr_err("Serial port %d: MCR_OUT2 write\n", index); #endif - mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev)); + mtty_trigger_interrupt(mdev_state); } if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) && @@ -452,7 +438,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state, #if defined(DEBUG_INTR) pr_err("Serial port %d: MCR RTS/DTR write\n", index); #endif - mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev)); + mtty_trigger_interrupt(mdev_state); } break; @@ -503,8 +489,7 @@ static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state, #endif if (mdev_state->s[index].uart_reg[UART_IER] & UART_IER_THRI) - mtty_trigger_interrupt( - mdev_uuid(mdev_state->mdev)); + mtty_trigger_interrupt(mdev_state); } mutex_unlock(&mdev_state->rxtx_lock); @@ -1028,17 +1013,9 @@ static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags, return ret; } -static int mtty_trigger_interrupt(const guid_t *uuid) +static int mtty_trigger_interrupt(struct mdev_state *mdev_state) { int ret = -1; - struct mdev_state *mdev_state; - - mdev_state = find_mdev_state_by_uuid(uuid); - - if (!mdev_state) { - pr_info("%s: mdev not found\n", __func__); - return -EINVAL; - } if ((mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) && (!mdev_state->msi_evtfd)) -- 2.21.0.777.g83232e3864