From patchwork Mon Apr 26 19:03:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: firas ashkar X-Patchwork-Id: 12224945 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=-16.8 required=3.0 tests=BAYES_00, 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 97468C433ED for ; Mon, 26 Apr 2021 19:09:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D81861158 for ; Mon, 26 Apr 2021 19:09:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236636AbhDZTJq (ORCPT ); Mon, 26 Apr 2021 15:09:46 -0400 Received: from mail.savoirfairelinux.com ([208.88.110.44]:47722 "EHLO mail.savoirfairelinux.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234229AbhDZTJo (ORCPT ); Mon, 26 Apr 2021 15:09:44 -0400 X-Greylist: delayed 314 seconds by postgrey-1.27 at vger.kernel.org; Mon, 26 Apr 2021 15:09:44 EDT Received: from localhost (localhost [127.0.0.1]) by mail.savoirfairelinux.com (Postfix) with ESMTP id 96F4E9C1604; Mon, 26 Apr 2021 15:03:47 -0400 (EDT) Received: from mail.savoirfairelinux.com ([127.0.0.1]) by localhost (mail.savoirfairelinux.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id TfXJ-JMsE0YT; Mon, 26 Apr 2021 15:03:47 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.savoirfairelinux.com (Postfix) with ESMTP id 0A1829C1556; Mon, 26 Apr 2021 15:03:47 -0400 (EDT) X-Virus-Scanned: amavisd-new at mail.savoirfairelinux.com Received: from mail.savoirfairelinux.com ([127.0.0.1]) by localhost (mail.savoirfairelinux.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id CeQtMkjyRRcf; Mon, 26 Apr 2021 15:03:46 -0400 (EDT) Received: from barbarian.mtl.sfl (unknown [192.168.51.254]) by mail.savoirfairelinux.com (Postfix) with ESMTPSA id D506D9C0272; Mon, 26 Apr 2021 15:03:46 -0400 (EDT) From: Firas Ashkar To: gregkh@linuxfoundation.org, mst@redhat.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] uio: uio_pci_generic: add memory mappings Date: Mon, 26 Apr 2021 15:03:46 -0400 Message-Id: <20210426190346.173919-1-firas.ashkar@savoirfairelinux.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org import memory resources from underlying pci device, thus allowing userspace applications to memory map those resources. Signed-off-by: Firas Ashkar --- :100644 100644 c7d681fef198 809eca95b5bb M drivers/uio/uio_pci_generic.c drivers/uio/uio_pci_generic.c | 52 +++++++++++++++++++++++++++++------ 1 file changed, 43 insertions(+), 9 deletions(-) diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c index c7d681fef198..809eca95b5bb 100644 --- a/drivers/uio/uio_pci_generic.c +++ b/drivers/uio/uio_pci_generic.c @@ -24,9 +24,9 @@ #include #include -#define DRIVER_VERSION "0.01.0" -#define DRIVER_AUTHOR "Michael S. Tsirkin " -#define DRIVER_DESC "Generic UIO driver for PCI 2.3 devices" +#define DRIVER_VERSION "0.01.0" +#define DRIVER_AUTHOR "Michael S. Tsirkin " +#define DRIVER_DESC "Generic UIO driver for PCI 2.3 devices" struct uio_pci_generic_dev { struct uio_info info; @@ -56,7 +56,8 @@ static int release(struct uio_info *info, struct inode *inode) } /* Interrupt handler. Read/modify/write the command register to disable - * the interrupt. */ + * the interrupt. + */ static irqreturn_t irqhandler(int irq, struct uio_info *info) { struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info); @@ -68,11 +69,12 @@ static irqreturn_t irqhandler(int irq, struct uio_info *info) return IRQ_HANDLED; } -static int probe(struct pci_dev *pdev, - const struct pci_device_id *id) +static int probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct uio_pci_generic_dev *gdev; + struct uio_mem *uiomem; int err; + int i; err = pcim_enable_device(pdev); if (err) { @@ -84,7 +86,8 @@ static int probe(struct pci_dev *pdev, if (pdev->irq && !pci_intx_mask_supported(pdev)) return -ENOMEM; - gdev = devm_kzalloc(&pdev->dev, sizeof(struct uio_pci_generic_dev), GFP_KERNEL); + gdev = devm_kzalloc(&pdev->dev, sizeof(struct uio_pci_generic_dev), + GFP_KERNEL); if (!gdev) return -ENOMEM; @@ -97,8 +100,39 @@ static int probe(struct pci_dev *pdev, gdev->info.irq_flags = IRQF_SHARED; gdev->info.handler = irqhandler; } else { - dev_warn(&pdev->dev, "No IRQ assigned to device: " - "no support for interrupts?\n"); + dev_warn( + &pdev->dev, + "No IRQ assigned to device: no support for interrupts?\n"); + } + + uiomem = &gdev->info.mem[0]; + for (i = 0; i < MAX_UIO_MAPS; ++i) { + struct resource *r = &pdev->resource[i]; + + if (r->flags != (IORESOURCE_SIZEALIGN | IORESOURCE_MEM)) + continue; + + if (uiomem >= &gdev->info.mem[MAX_UIO_MAPS]) { + dev_warn( + &pdev->dev, + "device has more than " __stringify( + MAX_UIO_MAPS) " I/O memory resources.\n"); + break; + } + + uiomem->memtype = UIO_MEM_PHYS; + uiomem->addr = r->start & PAGE_MASK; + uiomem->offs = r->start & ~PAGE_MASK; + uiomem->size = + (uiomem->offs + resource_size(r) + PAGE_SIZE - 1) & + PAGE_MASK; + uiomem->name = r->name; + ++uiomem; + } + + while (uiomem < &gdev->info.mem[MAX_UIO_MAPS]) { + uiomem->size = 0; + ++uiomem; } return devm_uio_register_device(&pdev->dev, &gdev->info);