linux-kernel - [PATCH v2 0/3] Add support for ACPI device in RMRR to access reserved memory

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Message-ID: <20200826102752.3776-1-FelixCui-oc@zhaoxin.com>
Date:   Wed, 26 Aug 2020 06:27:49 -0400
From:   FelixCuioc <FelixCui-oc@...oxin.com>
To:     Joerg Roedel <joro@...tes.org>, <iommu@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Dan Carpenter <dan.carpenter@...cle.com>, <kbuild@...ts.01.org>
CC:     <kbuild-all@...ts.01.org>, <CobeChen-oc@...oxin.com>,
        <RaymondPang-oc@...oxin.com>, <TonyWWang-oc@...oxin.com>
Subject: [PATCH v2 0/3]  Add support for ACPI device in RMRR to access reserved memory

BIOS allocate reserved memory ranges that may be DMA targets.
BIOS may report each such reserved memory region through the
RMRR structures,along with the devices that requires access to
the specified reserved memory region.

The purpose of this series is to achieve ACPI device in RMRR
access reserved memory.Therefore,it is necessary to increase
the analysis of acpi device in RMRR and establish a mapping
for this device.

The first patch adds interfaces for detecting ACPI device in RMRR
and in order to distinguish it from pci device,some interface
functions are modified.

The second patch adds support for probing ACPI device in RMRR.
In probe_acpi_namespace_devices(),add support for direct mapping
of ACPI device and add support for physical node of acpi device
to be NULL.

The last patch adds mutex_unlock(&adev->physical_node_lock)
before returning in probe_acpi_namespace_devices().

v1->v2:
   - Split the patch set to small series of patches
   - Move the processing of physical node of acpi device for NULL
     to probe_acpi_namespace_devices().
   - Add mutex_unlock(&adev->physical_node_lock) before returning
     in probe_acpi_namespace_devices().

FelixCuioc (3):
  iommu/vt-d:Add support for detecting ACPI device in RMRR
  iommu/vt-d:Add support for probing ACPI device in RMRR
  iommu/vt-d:Add mutex_unlock() before returning

 drivers/iommu/intel/dmar.c  | 74 ++++++++++++++++++++-----------------
 drivers/iommu/intel/iommu.c | 50 ++++++++++++++++++++++++-
 drivers/iommu/iommu.c       |  6 +++
 include/linux/dmar.h        | 12 +++++-
 include/linux/iommu.h       |  3 ++
 5 files changed, 109 insertions(+), 36 deletions(-)

-- 
2.17.1