From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ferruh Yigit Subject: [PATCH] igb_uio: fix mmap failure Date: Fri, 1 Jul 2016 12:35:12 +0100 Message-ID: <1467372912-31113-1-git-send-email-ferruh.yigit@intel.com> References: <57764BA3.5030903@intel.com> Cc: Stephen Hemminger To: dev@dpdk.org Return-path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id C87142C3F for ; Fri, 1 Jul 2016 13:35:24 +0200 (CEST) In-Reply-To: <57764BA3.5030903@intel.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" With kernels enabled CONFIG_IO_STRICT_DEVMEM option mmap the iomem area to userspace fails: EAL: pci_map_resource(): cannot mmap(39, 0x7f1c51800000, 0x100000, 0x0): Invalid argument (0xffffffffffffffff) As a workaround igb_uio can stop reserving PCI memory resources, from kernel point of view io-memory region looks like idle and mmap works again. With this update device io-memory range is not protected against any other kernel driver claim ownership on those resources, which shouldn't be a problem for dpdk usage module. Fixes: af75078fece3 ("first public release") Signed-off-by: Ferruh Yigit --- lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 13 ------------- 1 file changed, 13 deletions(-) diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c index 45a5720..df41e45 100644 --- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c +++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c @@ -342,16 +342,6 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) goto fail_free; } - /* - * reserve device's PCI memory regions for use by this - * module - */ - err = pci_request_regions(dev, "igb_uio"); - if (err != 0) { - dev_err(&dev->dev, "Cannot request regions\n"); - goto fail_disable; - } - /* enable bus mastering on the device */ pci_set_master(dev); @@ -441,8 +431,6 @@ fail_release_iomem: igbuio_pci_release_iomem(&udev->info); if (udev->mode == RTE_INTR_MODE_MSIX) pci_disable_msix(udev->pdev); - pci_release_regions(dev); -fail_disable: pci_disable_device(dev); fail_free: kfree(udev); @@ -460,7 +448,6 @@ igbuio_pci_remove(struct pci_dev *dev) igbuio_pci_release_iomem(&udev->info); if (udev->mode == RTE_INTR_MODE_MSIX) pci_disable_msix(dev); - pci_release_regions(dev); pci_disable_device(dev); pci_set_drvdata(dev, NULL); kfree(udev); -- 2.7.4