From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752619AbcIHALZ (ORCPT ); Wed, 7 Sep 2016 20:11:25 -0400 Received: from g2t1383g.austin.hpe.com ([15.233.16.89]:23449 "EHLO g2t1383g.austin.hpe.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751263AbcIHALQ (ORCPT ); Wed, 7 Sep 2016 20:11:16 -0400 From: divakar To: linux-kernel@vger.kernel.org Subject: Is multiple uio's for single device supported? Date: Wed, 07 Sep 2016 17:06:35 -0700 Message-ID: <29495897.RPkQXbJCt6@div_linux> User-Agent: KMail/4.13.3 (Linux/3.16.0-77-generic; KDE/4.13.3; x86_64; ; ) MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi My fpga device has multiple msi interrupts and I am trying to create an uio device for each msi interrupt. In the probe function of the pci device, I enable MSI for the pci device and allocate mem for uio info structures ( one for each msi ). First uio-info->irq is equal to the irq number in pdev->irq and It successfully creates /dev/uio-0 . For the second msi i assign uio_info->irq = pdev->irq + 1 and different uio_info->name, but uio_register_device fails. When traced it fails at the devm_request_irq function. I am running on 3.19 kernel and after checking the latest 4.7 I noticed devm_request has changed to request_irq. I get the same error even with request_irq. - Does the uio framework support multiple uio's for the same pci device? - if yes, is there something extra i need to do ? Please let me know if I can provide any more information. Below is the log from my driver. 103 fpga_uio_probe FPGA_PCI_UIO: probe 105 fpga_uio_probe FPGA_PCI_UIO: bar_base=183fffc00000 107 fpga_uio_probe FPGA_PCI_UIO: bar_len=1048576 125 fpga_uio_probe FPGA_PCI_UIO: pci_enable_device 132 fpga_uio_probe FPGA_PCI_UIO: pci_request_region 147 fpga_uio_probe FPGA_PCI_UIO: pci_iomap 153 fpga_uio_probe FPGA_PCI_UIO: base_add=ffffc90012a00000 169 fpga_uio_probe FPGA_PCI_UIO: nmsi_requested =8 211 fpga_uio_probe FPGA_PCI_UIO: irq_starting_indx =101 219 fpga_uio_probe FPGA_PCI_UIO: alloc mem for fpudev 226 fpga_uio_probe FPGA_PCI_UIO: alloc mem for uio_info 233 fpga_uio_probe FPGA_PCI_UIO: alloc mem for uio_priv_info 298 fpga_uio_probe FPGA_PCI_UIO: reg uio dev __uio_register_device 805 __uio_register_device 813 __uio_register_device 819 __uio_register_device 821 get_minor ret=0 __uio_register_device 825 __uio_register_device 835 __uio_register_device 840 __uio_register_device 846 devm_request ret=0 __uio_register_device 851 311 fpga_uio_probe FPGA_PCI_UIO: Enable all INT 298 fpga_uio_probe FPGA_PCI_UIO: reg uio dev __uio_register_device 805 __uio_register_device 813 __uio_register_device 819 __uio_register_device 821 get_minor ret=0 __uio_register_device 825 __uio_register_device 835 __uio_register_device 840 __uio_register_device 846 devm_request ret=-22 304 fpga_uio_probe FPGA_PCI_UIO: Failed to register uio devicefor msi=102, irq=1 ret=-22 Thanks