On 2012/10/9 11:08, Jiang Liu wrote: > Seems no need to change cpci/cpqphp/ibmphp/sgi/shpcihp, they all deal with PCI devices, > so only need to change acpiphp and pciehp. > ah, I will drop the patches for cpci/cpqphp/ibmphp/sgi/shpcihp. Thanks! Yijing > On 2012-10-9 11:03, Yijing Wang wrote: >> pci_enable_ari will be called if an ARI pci device found, then set its bridge ARI Forwarding Enable >> bit in Device Control 2 Register. But the bridge ARI Forwarding Enable bit will never be cleared >> when an ARI device hot removed. >> >> my steps: >> 1. Hot add an ARI pci device; >> 2. Hot remove the ARI pci device; >> 3. Hot add an non ARI pci device; >> >> In this case, after setp 3, we could only find fun 0 of non ARI pci device because of its bridge ARI Forwarding Enable >> bit set. >> >> As PCIe Spec 2.0(6.13/441) recommends: >> "Following a hot-plug event below a Downstream Port, it is strongly recommended that software >> Clear the ARI Forwarding Enable bit in the Downstream Port until software determines that a >> newly added component is in fact an ARI Device" >> >> This series of patches fix this problem. >> >> Yijing Wang (7): >> PCI: rework pci_enable_ari for support disable ari forwarding >> PCI, acpiphp: disable ARI forwarding for acpiphp >> PCI, pciehp: disable ARI forwarding for pciehp >> PCI, cpqphp: disable ARI forwarding for cpqphp >> PCI, shpchp: disable ARI forwarding for shpchp >> PCI, sgi: disable ARI forwarding for sgiphp >> PCI, ibmphp: disable ARI forwarding for ibmphp >> >> drivers/pci/hotplug/acpiphp_glue.c | 1 + >> drivers/pci/hotplug/cpci_hotplug_pci.c | 1 + >> drivers/pci/hotplug/cpqphp_pci.c | 1 + >> drivers/pci/hotplug/ibmphp_core.c | 1 + >> drivers/pci/hotplug/pciehp_pci.c | 1 + >> drivers/pci/hotplug/sgi_hotplug.c | 1 + >> drivers/pci/hotplug/shpchp_pci.c | 1 + >> drivers/pci/pci.c | 16 +++++++++++----- >> drivers/pci/pci.h | 2 +- >> drivers/pci/probe.c | 2 +- >> 10 files changed, 20 insertions(+), 7 deletions(-) >> >> >> >> . >> > > > > . > -- Thanks! Yijing -- 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
