Hi Marc, You can apply my R-b and T-b on the whole series. To be precise, I tested the get path only with my kvm-vfio forward series. Best Regards Eric Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx> Tested-by: Eric Auger <eric.auger@xxxxxxxxxx> On 03/18/2015 12:01 PM, Marc Zyngier wrote: > Despite Linux offering a rather fine grained control over the life > cycle of an interrupt, there is a few cases where it would be very > useful to snapshot (or even set) the internal state of the interrupt > controller for a given interrupt line: > > - With KVM, a device shared between VMs must have its whole context > switched, and that includes the interrupt line state. KVM/arm is > moving to using this. > - Some GPIO controllers seem to require peeking into the interrupt > controller they are connected to to report their internal state. > > Instead of letting people facing this situation doing horrible > (controller specific) hacks in their code, let's offer a couple of new > entry points that allow a few attributes to be read and set. > > Of course, this is a very dangerous thing to do if you don't know what > you doing, and I wouldn't expect most drivers to use this. But this > can also be a life saver at times. > > This patch series implement said API, and adds support for this to the > two main ARM interrupt controllers (GIC and GICv3). Available at: > > git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/irqchip_state > > This has been fairly heavily tested with KVM on ARM, which makes use > of this feature to context switch the timer interrupt (see the last > three patch in the above branch). > > Thanks, > > M. > > * From v3 [3] > - Rebased on top of 4.0-rc4 > > * From v2 [2]: > - Rebased on top of 3.19-rc3 > - Fixed irq_set_irqchip_state return value > > * From v1 [1]: > - Rebased on top of 3.18-rc7 + tip/irq/irqdomain-arm > - Now deals with stacked domains > - Changed the API to be less ambiguous (after review by tglx) > - Added IRQCHIP_STATE_LINE_LEVEL (as requested by Bjorn Anderson) > > [1] https://lkml.org/lkml/2014/10/25/134 > [2] https://lkml.org/lkml/2014/12/3/612 > [3] http://lkml.iu.edu/hypermail/linux/kernel/1501.0/03473.html > > Marc Zyngier (3): > genirq: Allow the irqchip state of an IRQ to be save/restored > irqchip: GIC: Add support for irq_{get,set}_irqchip_state > irqchip: GICv3: Add support for irq_{get,set}_irqchip_state > > drivers/irqchip/irq-gic-v3.c | 83 +++++++++++++++++++++++++++++++++------- > drivers/irqchip/irq-gic.c | 69 +++++++++++++++++++++++++++++++-- > include/linux/interrupt.h | 14 +++++++ > include/linux/irq.h | 6 +++ > kernel/irq/manage.c | 91 ++++++++++++++++++++++++++++++++++++++++++++ > 5 files changed, 246 insertions(+), 17 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
