linux-kernel - [PATCH v4 0/4] iommu/vt-d: Force snooping improvement

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Message-Id: <20220508123525.1973626-1-baolu.lu@linux.intel.com>
Date:   Sun,  8 May 2022 20:35:21 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>
Cc:     Jacob jun Pan <jacob.jun.pan@...el.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v4 0/4] iommu/vt-d: Force snooping improvement

Hi folks,

Previously, the IOMMU capability of enforcing cache coherency was queried
through iommu_capable(IOMMU_CAP_CACHE_COHERENCY). This is a global
capability, hence the IOMMU driver reports support for this capability
only when all IOMMUs in the system has this support.

Commit 6043257b1de06 ("iommu: Introduce the domain op
enforce_cache_coherency()") converts this into a per-domain test-and-set
option, and the previous iommu_capable(IOMMU_CAP_CACHE_COHERENCY) is
deprecated.

This is a follow-up series which improves the Intel IOMMU driver to
support the per-domain scheme better.

Best regards,
baolu

Change log:
v4:
 - Flush caches after changing PGSNP bit in the right way.

v3:
 - https://lore.kernel.org/linux-iommu/20220506052727.1689687-1-baolu.lu@linux.intel.com/
 - Hold the device_domain_lock when check and set force snooping.
 - Refind the commit messages.

v2:
 - https://lore.kernel.org/linux-iommu/20220505010710.1477739-1-baolu.lu@linux.intel.com/
 - Check whether force_snooping has already been set in
   intel_iommu_enforce_cache_coherency().
 - Set PGSNP pasid bit field during domain attaching if forcing_snooping
   is set.
 - Remove redundant list_empty() checks.
 - Add dmar_domain->set_pte_snp and set it if force snooping is enforced
   on a domain with 2nd-level translation.

v1:
 - https://lore.kernel.org/linux-iommu/20220501112434.874236-1-baolu.lu@linux.intel.com
 - Initial post.

Lu Baolu (4):
  iommu/vt-d: Block force-snoop domain attaching if no SC support
  iommu/vt-d: Check domain force_snooping against attached devices
  iommu/vt-d: Remove domain_update_iommu_snooping()
  iommu/vt-d: Remove hard coding PGSNP bit in PASID entries

 include/linux/intel-iommu.h |  1 +
 drivers/iommu/intel/pasid.h |  2 +
 drivers/iommu/intel/iommu.c | 90 ++++++++++++++++++++++---------------
 drivers/iommu/intel/pasid.c | 45 +++++++++++++++++--
 4 files changed, 99 insertions(+), 39 deletions(-)

-- 
2.25.1