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Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier |
Date: |
Sun, 10 Jun 2012 14:09:20 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-06-10 13:39, Michael S. Tsirkin wrote:
> It's OK to use recursion but when done through a callback
> like this it's unreadable.
Isn't the alternative poking into foreign bridge device states for their
secondary buses?
> Also, you need to setup you cache after intx cache has been
> initialized, and you provide no clean way to do that.
Once a PCI device is registered, the INTx route can be queried. So the
device user will call pci_device_route_intx_to_irq once (e.g. in the
device init function which is invoked afterward) to fill its cache and
receive a notification if an update is needed. I do not see why, and
specifically how you could query the route earlier or register a callback.
>
> One way to fix all this is call the notifier for devices, if set, from
> pci_set_bus_intx_routing.
> Then assume that intx to irq translations can be cached
> even though they aren't now. So you will need to invoke
> pci_set_bus_intx_routing on intx to irq mapping changes,
> and that fires the notifier for free.
pci_set_bus_intx_routing is really only for the initial setup of the
static INTx pin routes. And this happens on
pci_bus_irqs/pci_register_bus, ie. triggered by the host bridge. By that
time, there can't be any notifier listeners - as there are no devices yet.
Jan
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- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, (continued)
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/07
- [Qemu-devel] [PATCH v2 06/13] pci: Add INTx routing notifier, Jan Kiszka, 2012/06/08
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Jan Kiszka, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Jan Kiszka, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Jan Kiszka, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier,
Jan Kiszka <=
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Jan Kiszka, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Jan Kiszka, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
- Re: [Qemu-devel] [PATCH 06/13] pci: Add INTx routing notifier, Michael S. Tsirkin, 2012/06/10
[Qemu-devel] [PATCH 09/13] pci: Introduce and apply PCIDeviceAddress, Jan Kiszka, 2012/06/04
[Qemu-devel] [PATCH 04/13] pci: Rename map_irq to route_pin, Jan Kiszka, 2012/06/04