linux-kernel - [Patch Part2 V1 00/14] Enhance DMAR drivers to handle PCI/memory hotplug events

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Date:	Tue,  7 Jan 2014 17:00:20 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Ashok Raj <ashok.raj@...el.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Tony Luck <tony.luck@...el.com>,
	iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: [Patch Part2 V1 00/14] Enhance DMAR drivers to handle PCI/memory hotplug events

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(-)

-- 
1.7.10.4

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