multiple uio support for single pci device
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 device for msi=102, irq=1 ret=-22
Thanks