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SubjectRe: [Patch Part2 V1 00/14] Enhance DMAR drivers to handle PCI/memory hotplug events


On 2014/1/9 4:43, Yinghai Lu wrote:
> On Tue, Jan 7, 2014 at 1:00 AM, Jiang Liu <jiang.liu@linux.intel.com> wrote:
>> Intel DMA/interrupt remapping drivers scan available PCI/memory devices
>> at startup and cache discovered hardware topologies. They don't update
>> cached information if PCI/memory hotplug event happens at runtime, then
>> the stale information may break DMA/interrupt remapping logic.
>>
>> This patchset first (Patch 1-8) tries to introduces some helper
>> functions and fixes several bugs, then (Patch 9,10) uses a global
>> rwsem and RCU to protect global DMA/interrupt remapping data
>> structures, and finally (Patch 11-14) hook PCI/memory hotplug events
>> to update cached information.
>>
>> It's also a preparation for supporting of DMA/interrupt remapping
>> hotplug.
>>
>> Jiang Liu (14):
>> iommu/vt-d: factor out dmar_alloc_dev_scope() for later reuse
>> iommu/vt-d: move private structures and variables into intel-iommu.c
>> iommu/vt-d: simplify function get_domain_for_dev()
>> iommu/vt-d: free resources if failed to create domain for PCIe
>> endpoint
>> iommu/vt-d: create device_domain_info structure for intermediate P2P
>> bridges
>> iommu/vt-d: fix incorrect iommu_count for si_domain
>> iommu/vt-d: fix error in detect ATS capability
>> iommu/vt-d: introduce macro for_each_dev_scope() to walk device scope
>> entries
>> iommu/vt-d: introduce a rwsem to protect global data structures
>> iommu/vt-d: use RCU to protect global resources in interrupt context
>> iommu/vt-d, PCI: update DRHD/RMRR/ATSR device scope caches when PCI
>> hotplug happens
>> iommu/vt-d, PCI: unify the way to process DMAR device scope array
>> iommu/vt-d: update device to static identity domain mapping for PCI
>> hotplug
>> iommu/vt-d: update IOMMU state when memory hotplug happens
>>
>> drivers/iommu/dmar.c | 412 +++++++++++++++++--------
>> drivers/iommu/intel-iommu.c | 583 +++++++++++++++++++++--------------
>> drivers/iommu/intel_irq_remapping.c | 108 ++++---
>> include/linux/dmar.h | 75 +++--
>> 4 files changed, 753 insertions(+), 425 deletions(-)
>
>
> Hi, Jiang,
>
> What is relationship between your two patchset with my iommu hotplug patchset?
>
> https://lkml.org/lkml/2014/1/2/527
>
> or yours will just replace mine?
Hi Yinghai,
I have reviewed your v2 patch set, I think we are doing the
same task. If you agree, I will try to combine our two versions.

Thanks!
Gerry
>
> Thanks
>
> Yinghai
>


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