[mythtv-users] Udev

[Daryl McDonald]

How do working rules not match udevadm info queries?

SUBSYSTEM=="dvb", ATTRS{device}=="0x8852", PROGRAM="/bin/sh -c 'K=%k;
K=$${K#dvb}; printf dvb/adapterHP1250/%%s $${K#*.}; exit 0'", SYMLINK+="%c"

SUBSYSTEM=="dvb", ATTRS{device}=="0x8802", PROGRAM="/bin/sh -c 'K=%k;
K=$${K#dvb}; printf dvb/adapterPC800i/%%s $${K#*.}; exit 0'", SYMLINK+="%c"

Above are my working rules and below is the udevadm query:

looking at device
'/devices/pci0000:00/0000:00:04.0/0000:02:00.0/dvb/dvb0.dvr0':

    KERNEL=="dvb0.dvr0"

    SUBSYSTEM=="dvb"

    DRIVER==""


  looking at parent device '/devices/pci0000:00/0000:00:04.0/0000:02:00.0':

    KERNELS=="0000:02:00.0"

    SUBSYSTEMS=="pci"

    DRIVERS=="cx23885"

    ATTRS{broken_parity_status}=="0"

    ATTRS{class}=="0x040000"

    ATTRS{consistent_dma_mask_bits}=="32"

    ATTRS{current_link_speed}=="2.5 GT/s"

    ATTRS{current_link_width}=="1"

    ATTRS{d3cold_allowed}=="1"

    ATTRS{device}=="0x8852"

    ATTRS{dma_mask_bits}=="32"

    ATTRS{driver_override}=="(null)"

    ATTRS{enable}=="1"

    ATTRS{irq}=="16"

    ATTRS{local_cpulist}=="0-2"

    ATTRS{local_cpus}=="07"

    ATTRS{max_link_speed}=="2.5 GT/s"

    ATTRS{max_link_width}=="1"

    ATTRS{msi_bus}=="1"

    ATTRS{numa_node}=="0"

    ATTRS{revision}=="0x04"

    ATTRS{subsystem_device}=="0x7911"

    ATTRS{subsystem_vendor}=="0x0070"

    ATTRS{vendor}=="0x14f1"


  looking at parent device '/devices/pci0000:00/0000:00:04.0':

    KERNELS=="0000:00:04.0"

    SUBSYSTEMS=="pci"

    DRIVERS=="pcieport"

    ATTRS{broken_parity_status}=="0"

    ATTRS{class}=="0x060400"

    ATTRS{consistent_dma_mask_bits}=="32"

    ATTRS{current_link_speed}=="2.5 GT/s"

    ATTRS{current_link_width}=="1"

    ATTRS{d3cold_allowed}=="1"

    ATTRS{device}=="0x9604"

    ATTRS{dma_mask_bits}=="32"

    ATTRS{driver_override}=="(null)"

    ATTRS{enable}=="1"

    ATTRS{irq}=="16"

    ATTRS{local_cpulist}=="0-2"

    ATTRS{local_cpus}=="07"

    ATTRS{max_link_speed}=="5 GT/s"

    ATTRS{max_link_width}=="1"

    ATTRS{msi_bus}=="1"

    ATTRS{numa_node}=="0"

    ATTRS{revision}=="0x00"

    ATTRS{secondary_bus_number}=="2"

    ATTRS{subordinate_bus_number}=="2"

    ATTRS{subsystem_device}=="0x2285"

    ATTRS{subsystem_vendor}=="0x1019"

    ATTRS{vendor}=="0x1022"


  looking at parent device '/devices/pci0000:00':

    KERNELS=="pci0000:00"

    SUBSYSTEMS==""

    DRIVERS==""


I need to understand this before creating new rules for the introduction of
new cards.

On Tue, Nov 27, 2018 at 8:47 AM Ian Campbell <ijc at hellion.org.uk> wrote:

> On Tue, 2018-11-27 at 08:17 -0500, Daryl McDonald wrote:
> > In  previous set up with two sources, and cards staying in the same
> > slots, enumeration would, on occasion, be different. Stephan, are you
> > saying that is now different?
> > Of four tuners, there will be one HP1250, one HP winTV, and two
> > PCi800's, the last two of which may have no differences, but I may
> > try and find some (for hind-sight diagnostics)
>
> Even in the absence of USB devices masquerading as PCI cards the
> loading of drivers, and therefore the binding of driver→device, is
> asynchronous, and therefore the assignment of DVB adapter IDs can vary
> depending on the order they get discovered in.
>
> Personally I deal with this using module options rather than udev:
>    # cat /etc/modprobe.d/dvb-usb-dib0700.conf
>    options dvb-usb-dib0700 adapter_nr=0,1,2,3
>    options em28xx-dvb adapter_nr=4,5,6,7
>
> This ensures that adaptors 0-3 are always the dib0700 ones and adaptors
> 4-7 are always the em28xx ones, but makes no guarantee about which
> dib0700 will be adaptor #3 etc. That's all I care about because the
> em28xx ones are HD capable while the dib0700 ones are not.
>
> This works well enough for me, but it does mean that if one adaptor is
> flakey then it can switch around (within its corresponding set of ids)
> on reboot.
>
> If your three classes of card use three different drivers then you
> ought to be able to arrange that the HP1250=adaptor#0, the
> winTV=adaptor#1 and the PCi800's are #2 and #3 (in some order).
>
> Ian.
>
>
>
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