Hi Minghuan, Not clear what this patch intends to do. Can you please explain the point about SMMU isolating limited device ID. Regards Varun > -----Original Message----- > From: linux-arm-kernel [mailto:linux-arm-kernel- > bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Minghuan Lian > Sent: Wednesday, April 15, 2015 3:19 PM > To: linux-pci@xxxxxxxxxxxxxxx > Cc: Arnd Bergmann; Lian Minghuan-B31939; Hu Mingkai-B21284; Zang Roy- > R61911; Yoder Stuart-B08248; Bjorn Helgaas; Wood Scott-B07421; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx > Subject: [PATCH 1/2] irqchip/gicv3-its: Support share device ID > > SMMU of some platforms can only isolate limited device ID. > This may require that all PCI devices share the same ITS device with the fixed > device ID. The patch adds function arch_msi_share_devid_update used for > these platforms to update the fixed device ID and maximum MSI interrupts > number. > > Signed-off-by: Minghuan Lian <Minghuan.Lian@xxxxxxxxxxxxx> > --- > drivers/irqchip/irq-gic-v3-its.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c > index d0374a6..be78d0a 100644 > --- a/drivers/irqchip/irq-gic-v3-its.c > +++ b/drivers/irqchip/irq-gic-v3-its.c > @@ -1169,6 +1169,15 @@ static int its_get_pci_alias(struct pci_dev *pdev, > u16 alias, void *data) > return 0; > } > > +void __weak > +arch_msi_share_devid_update(struct pci_dev *pdev, u32 *dev_id, u32 > +*nvesc) { > + /* > + * use PCI_DEVID NOT share device ID as default > + * so nothing need to do > + */ > +} > + > static int its_msi_prepare(struct irq_domain *domain, struct device *dev, > int nvec, msi_alloc_info_t *info) { @@ -1185,6 > +1194,8 @@ static int its_msi_prepare(struct irq_domain *domain, struct > device *dev, > dev_alias.count = nvec; > > pci_for_each_dma_alias(pdev, its_get_pci_alias, &dev_alias); > + arch_msi_share_devid_update(pdev, &dev_alias.dev_id, > +&dev_alias.count); > + > its = domain->parent->host_data; > > its_dev = its_find_device(its, dev_alias.dev_id); > -- > 1.9.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
