| Age | Commit message (Collapse) | Author |
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The dma-mapping core and the implementations do not change the DMA
attributes passed by pointer. Thus the pointer can point to const data.
However the attributes do not have to be a bitfield. Instead unsigned
long will do fine:
1. This is just simpler. Both in terms of reading the code and setting
attributes. Instead of initializing local attributes on the stack
and passing pointer to it to dma_set_attr(), just set the bits.
2. It brings safeness and checking for const correctness because the
attributes are passed by value.
Semantic patches for this change (at least most of them):
virtual patch
virtual context
@r@
identifier f, attrs;
@@
f(...,
- struct dma_attrs *attrs
+ unsigned long attrs
, ...)
{
...
}
@@
identifier r.f;
@@
f(...,
- NULL
+ 0
)
and
// Options: --all-includes
virtual patch
virtual context
@r@
identifier f, attrs;
type t;
@@
t f(..., struct dma_attrs *attrs);
@@
identifier r.f;
@@
f(...,
- NULL
+ 0
)
Link: http://lkml.kernel.org/r/1468399300-5399-2-git-send-email-k.kozlowski@samsung.com
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Acked-by: Mark Salter <msalter@redhat.com> [c6x]
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> [cris]
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> [drm]
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Fabien Dessenne <fabien.dessenne@st.com> [bdisp]
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> [vb2-core]
Acked-by: David Vrabel <david.vrabel@citrix.com> [xen]
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [xen swiotlb]
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon]
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390]
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> [avr32]
Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc]
Acked-by: Robin Murphy <robin.murphy@arm.com> [arm64 and dma-iommu]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU updates from Joerg Roedel:
- big-endian support and preparation for defered probing for the Exynos
IOMMU driver
- simplifications in iommu-group id handling
- support for Mediatek generation one IOMMU hardware
- conversion of the AMD IOMMU driver to use the generic IOVA allocator.
This driver now also benefits from the recent scalability
improvements in the IOVA code.
- preparations to use generic DMA mapping code in the Rockchip IOMMU
driver
- device tree adaption and conversion to use generic page-table code
for the MSM IOMMU driver
- an iova_to_phys optimization in the ARM-SMMU driver to greatly
improve page-table teardown performance with VFIO
- various other small fixes and conversions
* tag 'iommu-updates-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (59 commits)
iommu/amd: Initialize dma-ops domains with 3-level page-table
iommu/amd: Update Alias-DTE in update_device_table()
iommu/vt-d: Return error code in domain_context_mapping_one()
iommu/amd: Use container_of to get dma_ops_domain
iommu/amd: Flush iova queue before releasing dma_ops_domain
iommu/amd: Handle IOMMU_DOMAIN_DMA in ops->domain_free call-back
iommu/amd: Use dev_data->domain in get_domain()
iommu/amd: Optimize map_sg and unmap_sg
iommu/amd: Introduce dir2prot() helper
iommu/amd: Implement timeout to flush unmap queues
iommu/amd: Implement flush queue
iommu/amd: Allow NULL pointer parameter for domain_flush_complete()
iommu/amd: Set up data structures for flush queue
iommu/amd: Remove align-parameter from __map_single()
iommu/amd: Remove other remains of old address allocator
iommu/amd: Make use of the generic IOVA allocator
iommu/amd: Remove special mapping code for dma_ops path
iommu/amd: Pass gfp-flags to iommu_map_page()
iommu/amd: Implement apply_dm_region call-back
iommu/amd: Create a list of reserved iova addresses
...
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Some of our "for_each_xyz()" macro constructs make gcc unhappy about
lack of braces around if-statements inside or outside the loop, because
the loop construct itself has a "if-then-else" statement inside of it.
The resulting warnings look something like this:
drivers/gpu/drm/i915/i915_debugfs.c: In function ‘i915_dump_lrc’:
drivers/gpu/drm/i915/i915_debugfs.c:2103:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses]
if (ctx != dev_priv->kernel_context)
^
even if the code itself is fine.
Since the warning is fairly easy to avoid by adding a braces around the
if-statement near the for_each_xyz() construct, do so, rather than
disabling the otherwise potentially useful warning.
(The if-then-else statements used in the "for_each_xyz()" constructs are
designed to be inherently safe even with no braces, but in this case
it's quite understandable that gcc isn't really able to tell that).
This finally leaves the standard "allmodconfig" build with just a
handful of remaining warnings, so new and valid warnings hopefully will
stand out.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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'arm/msm', 'arm/rockchip', 'arm/smmu' and 'core' into next
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In 'commit <55d940430ab9> ("iommu/vt-d: Get rid of domain->iommu_lock")',
the error handling path is changed a little, which makes the function
always return 0.
This path fixes this.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Fixes: 55d940430ab9 ('iommu/vt-d: Get rid of domain->iommu_lock')
Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Per VT-d spec Section 10.4.2 ("Capability Register"), the maximum
number of possible domains is 64K; indeed this is the maximum value
that the cap_ndoms() macro will expand to. Since the value 65536
will not fix in a u16, the 'did' variable must be promoted to an
int, otherwise the test for < 65536 will always be true and the
loop will never end.
The symptom, in my case, was a hung machine during suspend.
Fixes: 3bd4f9112f87 ("iommu/vt-d: Fix overflow of iommu->domains array")
Signed-off-by: Aaron Campbell <aaron@monkey.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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The valid range of 'did' in get_iommu_domain(*iommu, did)
is 0..cap_ndoms(iommu->cap), so don't exceed that
range in free_all_cpu_cached_iovas().
The user-visible impact of the out-of-bounds access is the machine
hanging on suspend-to-ram. It is, in fact, a kernel panic, but due
to already suspended devices, that's often not visible to the user.
Fixes: 22e2f9fa63b0 ("iommu/vt-d: Use per-cpu IOVA caching")
Signed-off-by: Jan Niehusmann <jan@gondor.com>
Tested-By: Marius Vlad <marius.c.vlad@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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This seems to be required on some X58 chipsets on systems
with more than one IOMMU. QI does not work until it is
enabled on all IOMMUs in the system.
Reported-by: Dheeraj CVR <cvr.dheeraj@gmail.com>
Tested-by: Dheeraj CVR <cvr.dheeraj@gmail.com>
Fixes: 5f0a7f7614a9 ('iommu/vt-d: Make root entry visible for hardware right after allocation')
Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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In commit <8bf478163e69> ("iommu/vt-d: Split up iommu->domains array"), it
it splits iommu->domains in two levels. Each first level contains 256
entries of second level. In case of the ndomains is exact a multiple of
256, it would have one more extra first level entry for current
implementation.
This patch refines this calculation to reduce the extra first level entry.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Pull intel IOMMU updates from David Woodhouse:
"This patchset improves the scalability of the Intel IOMMU code by
resolving two spinlock bottlenecks and eliminating the linearity of
the IOVA allocator, yielding up to ~5x performance improvement and
approaching 'iommu=off' performance"
* git://git.infradead.org/intel-iommu:
iommu/vt-d: Use per-cpu IOVA caching
iommu/iova: introduce per-cpu caching to iova allocation
iommu/vt-d: change intel-iommu to use IOVA frame numbers
iommu/vt-d: avoid dev iotlb logic for domains with no dev iotlbs
iommu/vt-d: only unmap mapped entries
iommu/vt-d: correct flush_unmaps pfn usage
iommu/vt-d: per-cpu deferred invalidation queues
iommu/vt-d: refactoring of deferred flush entries
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'ppc/pamu', 'core' and 'x86/amd' into next
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Commit 9257b4a2 ('iommu/iova: introduce per-cpu caching to iova allocation')
introduced per-CPU IOVA caches to massively improve scalability. Use them.
Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased, cleaned up and reworded the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
[dwmw2: split out VT-d part into a separate patch]
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Make intel-iommu map/unmap/invalidate work with IOVA pfns instead of
pointers to "struct iova". This avoids using the iova struct from the IOVA
red-black tree and the resulting explicit find_iova() on unmap.
This patch will allow us to cache IOVAs in the next patch, in order to
avoid rbtree operations for the majority of map/unmap operations.
Note: In eliminating the find_iova() operation, we have also eliminated
the sanity check previously done in the unmap flow. Arguably, this was
overhead that is better avoided in production code, but it could be
brought back as a debug option for driver development.
Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased, fixed to not break iova api, and reworded
the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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This patch avoids taking the device_domain_lock in iommu_flush_dev_iotlb()
for domains with no dev iotlb devices.
Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[gvdl@google.com: fixed locking issues]
Signed-off-by: Godfrey van der Linden <gvdl@google.com>
[mad@cs.technion.ac.il: rebased and reworded the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Current unmap implementation unmaps the entire area covered by the IOVA
range, which is a power-of-2 aligned region. The corresponding map,
however, only maps those pages originally mapped by the user. This
discrepancy can lead to unmapping of already unmapped entries, which is
unneeded work.
With this patch, only mapped pages are unmapped. This is also a baseline
for a map/unmap implementation based on IOVAs and not iova structures,
which will allow caching.
Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased and reworded the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Change flush_unmaps() to correctly pass iommu_flush_iotlb_psi()
dma addresses. (x86_64 mm and dma have the same size for pages
at the moment, but this usage improves consistency.)
Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased and reworded the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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The IOMMU's IOTLB invalidation is a costly process. When iommu mode
is not set to "strict", it is done asynchronously. Current code
amortizes the cost of invalidating IOTLB entries by batching all the
invalidations in the system and performing a single global invalidation
instead. The code queues pending invalidations in a global queue that
is accessed under the global "async_umap_flush_lock" spinlock, which
can result is significant spinlock contention.
This patch splits this deferred queue into multiple per-cpu deferred
queues, and thus gets rid of the "async_umap_flush_lock" and its
contention. To keep existing deferred invalidation behavior, it still
invalidates the pending invalidations of all CPUs whenever a CPU
reaches its watermark or a timeout occurs.
Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased, cleaned up and reworded the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Currently, deferred flushes' info is striped between several lists in
the flush tables. Instead, move all information about a specific flush
to a single entry in this table.
This patch does not introduce any functional change.
Signed-off-by: Omer Peleg <omer@cs.technion.ac.il>
[mad@cs.technion.ac.il: rebased and reworded the commit message]
Signed-off-by: Adam Morrison <mad@cs.technion.ac.il>
Reviewed-by: Shaohua Li <shli@fb.com>
Reviewed-by: Ben Serebrin <serebrin@google.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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My static checker complains that "dma_alias" is uninitialized unless we
are dealing with a pci device. This is true but harmless. Anyway, we
can flip the condition around to silence the warning.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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dma_pte_free_pagetable no longer depends on last level ptes
being clear, it clears them itself. Fix up the comment to
match.
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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In the PCI hotplug path of the Intel IOMMU driver, replace
the usage of the BUS_NOTIFY_DEL_DEVICE notifier, which is
executed before the driver is unbound from the device, with
BUS_NOTIFY_REMOVED_DEVICE, which runs after that.
This fixes a kernel BUG being triggered in the VT-d code
when the device driver tries to unmap DMA buffers and the
VT-d driver already destroyed all mappings.
Reported-by: Stefani Seibold <stefani@seibold.net>
Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Fix a simple typo when disabling IOTLB on PCI(e) devices.
Fixes: b16d0cb9e2fc ("iommu/vt-d: Always enable PASID/PRI PCI capabilities before ATS")
Cc: stable@vger.kernel.org # v4.4
Signed-off-by: Jeremy McNicoll <jmcnicol@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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commit db0fa0cb0157 "scatterlist: use sg_phys()" did replacements of
the form:
phys_addr_t phys = page_to_phys(sg_page(s));
phys_addr_t phys = sg_phys(s) & PAGE_MASK;
However, this breaks platforms where sizeof(phys_addr_t) >
sizeof(unsigned long). Revert for 4.3 and 4.4 to make room for a
combined helper in 4.5.
Cc: <stable@vger.kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Fixes: db0fa0cb0157 ("scatterlist: use sg_phys()")
Suggested-by: Joerg Roedel <joro@8bytes.org>
Reported-by: Vitaly Lavrov <vel21ripn@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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sleep and avoiding waking kswapd
__GFP_WAIT has been used to identify atomic context in callers that hold
spinlocks or are in interrupts. They are expected to be high priority and
have access one of two watermarks lower than "min" which can be referred
to as the "atomic reserve". __GFP_HIGH users get access to the first
lower watermark and can be called the "high priority reserve".
Over time, callers had a requirement to not block when fallback options
were available. Some have abused __GFP_WAIT leading to a situation where
an optimisitic allocation with a fallback option can access atomic
reserves.
This patch uses __GFP_ATOMIC to identify callers that are truely atomic,
cannot sleep and have no alternative. High priority users continue to use
__GFP_HIGH. __GFP_DIRECT_RECLAIM identifies callers that can sleep and
are willing to enter direct reclaim. __GFP_KSWAPD_RECLAIM to identify
callers that want to wake kswapd for background reclaim. __GFP_WAIT is
redefined as a caller that is willing to enter direct reclaim and wake
kswapd for background reclaim.
This patch then converts a number of sites
o __GFP_ATOMIC is used by callers that are high priority and have memory
pools for those requests. GFP_ATOMIC uses this flag.
o Callers that have a limited mempool to guarantee forward progress clear
__GFP_DIRECT_RECLAIM but keep __GFP_KSWAPD_RECLAIM. bio allocations fall
into this category where kswapd will still be woken but atomic reserves
are not used as there is a one-entry mempool to guarantee progress.
o Callers that are checking if they are non-blocking should use the
helper gfpflags_allow_blocking() where possible. This is because
checking for __GFP_WAIT as was done historically now can trigger false
positives. Some exceptions like dm-crypt.c exist where the code intent
is clearer if __GFP_DIRECT_RECLAIM is used instead of the helper due to
flag manipulations.
o Callers that built their own GFP flags instead of starting with GFP_KERNEL
and friends now also need to specify __GFP_KSWAPD_RECLAIM.
The first key hazard to watch out for is callers that removed __GFP_WAIT
and was depending on access to atomic reserves for inconspicuous reasons.
In some cases it may be appropriate for them to use __GFP_HIGH.
The second key hazard is callers that assembled their own combination of
GFP flags instead of starting with something like GFP_KERNEL. They may
now wish to specify __GFP_KSWAPD_RECLAIM. It's almost certainly harmless
if it's missed in most cases as other activity will wake kswapd.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull iommu updates from Joerg Roedel:
"This time including:
- A new IOMMU driver for s390 pci devices
- Common dma-ops support based on iommu-api for ARM64. The plan is
to use this as a basis for ARM32 and hopefully other architectures
as well in the future.
- MSI support for ARM-SMMUv3
- Cleanups and dead code removal in the AMD IOMMU driver
- Better RMRR handling for the Intel VT-d driver
- Various other cleanups and small fixes"
* tag 'iommu-updates-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (41 commits)
iommu/vt-d: Fix return value check of parse_ioapics_under_ir()
iommu/vt-d: Propagate error-value from ir_parse_ioapic_hpet_scope()
iommu/vt-d: Adjust the return value of the parse_ioapics_under_ir
iommu: Move default domain allocation to iommu_group_get_for_dev()
iommu: Remove is_pci_dev() fall-back from iommu_group_get_for_dev
iommu/arm-smmu: Switch to device_group call-back
iommu/fsl: Convert to device_group call-back
iommu: Add device_group call-back to x86 iommu drivers
iommu: Add generic_device_group() function
iommu: Export and rename iommu_group_get_for_pci_dev()
iommu: Revive device_group iommu-ops call-back
iommu/amd: Remove find_last_devid_on_pci()
iommu/amd: Remove first/last_device handling
iommu/amd: Initialize amd_iommu_last_bdf for DEV_ALL
iommu/amd: Cleanup buffer allocation
iommu/amd: Remove cmd_buf_size and evt_buf_size from struct amd_iommu
iommu/amd: Align DTE flag definitions
iommu/amd: Remove old alias handling code
iommu/amd: Set alias DTE in do_attach/do_detach
iommu/amd: WARN when __[attach|detach]_device are called with irqs enabled
...
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Pull intel iommu updates from David Woodhouse:
"This adds "Shared Virtual Memory" (aka PASID support) for the Intel
IOMMU. This allows devices to do DMA using process address space,
translated through the normal CPU page tables for the relevant mm.
With corresponding support added to the i915 driver, this has been
tested with the graphics device on Skylake. We don't have the
required TLP support in our PCIe root ports for supporting discrete
devices yet, so it's only integrated devices that can do it so far"
* git://git.infradead.org/intel-iommu: (23 commits)
iommu/vt-d: Fix rwxp flags in SVM device fault callback
iommu/vt-d: Expose struct svm_dev_ops without CONFIG_INTEL_IOMMU_SVM
iommu/vt-d: Clean up pasid_enabled() and ecs_enabled() dependencies
iommu/vt-d: Handle Caching Mode implementations of SVM
iommu/vt-d: Fix SVM IOTLB flush handling
iommu/vt-d: Use dev_err(..) in intel_svm_device_to_iommu(..)
iommu/vt-d: fix a loop in prq_event_thread()
iommu/vt-d: Fix IOTLB flushing for global pages
iommu/vt-d: Fix address shifting in page request handler
iommu/vt-d: shift wrapping bug in prq_event_thread()
iommu/vt-d: Fix NULL pointer dereference in page request error case
iommu/vt-d: Implement SVM_FLAG_SUPERVISOR_MODE for kernel access
iommu/vt-d: Implement SVM_FLAG_PRIVATE_PASID to allocate unique PASIDs
iommu/vt-d: Add callback to device driver on page faults
iommu/vt-d: Implement page request handling
iommu/vt-d: Generalise DMAR MSI setup to allow for page request events
iommu/vt-d: Implement deferred invalidate for SVM
iommu/vt-d: Add basic SVM PASID support
iommu/vt-d: Always enable PASID/PRI PCI capabilities before ATS
iommu/vt-d: Add initial support for PASID tables
...
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'x86/amd' into next
Conflicts:
drivers/iommu/amd_iommu_types.h
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When booted with intel_iommu=ecs_off we were still allocating the PASID
tables even though we couldn't actually use them. We really want to make
the pasid_enabled() macro depend on ecs_enabled().
Which is unfortunate, because currently they're the other way round to
cope with the Broadwell/Skylake problems with ECS.
Instead of having ecs_enabled() depend on pasid_enabled(), which was never
something that made me happy anyway, make it depend in the normal case
on the "broken PASID" bit 28 *not* being set.
Then pasid_enabled() can depend on ecs_enabled() as it should. And we also
don't need to mess with it if we ever see an implementation that has some
features requiring ECS (like PRI) but which *doesn't* have PASID support.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Set the device_group call-back to pci_device_group() for the
Intel VT-d and the AMD IOMMU driver.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Pull intel-iommu bugfix from David Woodhouse:
"This contains a single fix, for when the IOMMU API is used to overlay
an existing mapping comprised of 4KiB pages, with a mapping that can
use superpages.
For the *first* superpage in the new mapping, we were correctly¹
freeing the old bottom-level page table page and clearing the link to
it, before installing the superpage. For subsequent superpages,
however, we weren't. This causes a memory leak, and a warning about
setting a PTE which is already set.
¹ Well, not *entirely* correctly. We just free the page table pages
right there and then, which is wrong. In fact they should only be
freed *after* the IOTLB is flushed so we know the hardware will no
longer be looking at them.... and in fact I note that the IOTLB
flush is completely missing from the intel_iommu_map() code path,
although it needs to be there if it's permitted to overwrite
existing mappings.
Fixing those is somewhat more intrusive though, and will probably
need to wait for 4.4 at this point"
* tag 'for-linus-20151021' of git://git.infradead.org/intel-iommu:
iommu/vt-d: fix range computation when making room for large pages
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This will give a little bit of assistance to those developing drivers
using SVM. It might cause a slight annoyance to end-users whose kernel
disables the IOMMU when drivers are trying to use it. But the fix there
is to fix the kernel to enable the IOMMU.
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Largely based on the driver-mode implementation by Jesse Barnes.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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This provides basic PASID support for endpoint devices, tested with a
version of the i915 driver.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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The behaviour if you enable PASID support after ATS is undefined. So we
have to enable it first, even if we don't know whether we'll need it.
This is safe enough; unless we set up a context that permits it, the device
can't actually *do* anything with it.
Also shift the feature detction to dmar_insert_one_dev_info() as it only
needs to happen once.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Add CONFIG_INTEL_IOMMU_SVM, and allocate PASID tables on supported hardware.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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As long as we use an identity mapping to work around the worst of the
hardware bugs which caused us to defeature it and change the definition
of the capability bit, we *can* use PASID support on the devices which
advertised it in bit 28 of the Extended Capability Register.
Allow people to do so with 'intel_iommu=pasid28' on the command line.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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The VT-d specification says that "Software must enable ATS on endpoint
devices behind a Root Port only if the Root Port is reported as
supporting ATS transactions."
We walk up the tree to find a Root Port, but for integrated devices we
don't find one — we get to the host bridge. In that case we *should*
allow ATS. Currently we don't, which means that we are incorrectly
failing to use ATS for the integrated graphics. Fix that.
We should never break out of this loop "naturally" with bus==NULL,
since we'll always find bridge==NULL in that case (and now return 1).
So remove the check for (!bridge) after the loop, since it can never
happen. If it did, it would be worthy of a BUG_ON(!bridge). But since
it'll oops anyway in that case, that'll do just as well.
Cc: stable@vger.kernel.org
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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In preparation for deprecating ioremap_cache() convert its usage in
intel-iommu to memremap. This also eliminates the mishandling of the
__iomem annotation in the implementation.
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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In preparation for the installation of a large page, any small page
tables that may still exist in the target IOV address range are
removed. However, if a scatter/gather list entry is large enough to
fit more than one large page, the address space for any subsequent
large pages is not cleared of conflicting small page tables.
This can cause legitimate mapping requests to fail with errors of the
form below, potentially followed by a series of IOMMU faults:
ERROR: DMA PTE for vPFN 0xfde00 already set (to 7f83a4003 not 7e9e00083)
In this example, a 4MiB scatter/gather list entry resulted in the
successful installation of a large page @ vPFN 0xfdc00, followed by
a failed attempt to install another large page @ vPFN 0xfde00, due to
the presence of a pointer to a small page table @ 0x7f83a4000.
To address this problem, compute the number of large pages that fit
into a given scatter/gather list entry, and use it to derive the
last vPFN covered by the large page(s).
Cc: stable@vger.kernel.org
Signed-off-by: Christian Zander <christian@nervanasys.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU fixes from Joerg Roedel:
"A few fixes piled up:
- Fix for a suspend/resume issue where PCI probing code overwrote
dev->irq for the MSI irq of the AMD IOMMU.
- Fix for a kernel crash when a 32 bit PCI device was assigned to a
KVM guest.
- Fix for a possible memory leak in the VT-d driver
- A couple of fixes for the ARM-SMMU driver"
* tag 'iommu-fixes-v4.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
iommu/amd: Fix NULL pointer deref on device detach
iommu/amd: Prevent binding other PCI drivers to IOMMU PCI devices
iommu/vt-d: Fix memory leak in dmar_insert_one_dev_info()
iommu/arm-smmu: Use correct address mask for CMD_TLBI_S2_IPA
iommu/arm-smmu: Ensure IAS is set correctly for AArch32-capable SMMUs
iommu/io-pgtable-arm: Don't use dma_to_phys()
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Currently the RMRR entries are created only at boot time.
This means they will vanish when the domain allocated at
boot time is destroyed.
This patch makes sure that also newly allocated domains will
get RMRR mappings.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Split the part of the function that fetches the domain out
and put the rest into into a domain_prepare_identity_map, so
that the code can also be used with when the domain is
already known.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Pull IOVA fixes from David Woodhouse:
"The main fix here is the first one, fixing the over-allocation of
size-aligned requests. The other patches simply make the existing
IOVA code available to users other than the Intel VT-d driver, with no
functional change.
I concede the latter really *should* have been submitted during the
merge window, but since it's basically risk-free and people are
waiting to build on top of it and it's my fault I didn't get it in, I
(and they) would be grateful if you'd take it"
* git://git.infradead.org/intel-iommu:
iommu: Make the iova library a module
iommu: iova: Export symbols
iommu: iova: Move iova cache management to the iova library
iommu/iova: Avoid over-allocating when size-aligned
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We are returning NULL if we are not able to attach the iommu
to the domain but while returning we missed freeing info.
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull iommu updates for from Joerg Roedel:
"This time the IOMMU updates are mostly cleanups or fixes. No big new
features or drivers this time. In particular the changes include:
- Bigger cleanup of the Domain<->IOMMU data structures and the code
that manages them in the Intel VT-d driver. This makes the code
easier to understand and maintain, and also easier to keep the data
structures in sync. It is also a preparation step to make use of
default domains from the IOMMU core in the Intel VT-d driver.
- Fixes for a couple of DMA-API misuses in ARM IOMMU drivers, namely
in the ARM and Tegra SMMU drivers.
- Fix for a potential buffer overflow in the OMAP iommu driver's
debug code
- A couple of smaller fixes and cleanups in various drivers
- One small new feature: Report domain-id usage in the Intel VT-d
driver to easier detect bugs where these are leaked"
* tag 'iommu-updates-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (83 commits)
iommu/vt-d: Really use upper context table when necessary
x86/vt-d: Fix documentation of DRHD
iommu/fsl: Really fix init section(s) content
iommu/io-pgtable-arm: Unmap and free table when overwriting with block
iommu/io-pgtable-arm: Move init-fn declarations to io-pgtable.h
iommu/msm: Use BUG_ON instead of if () BUG()
iommu/vt-d: Access iomem correctly
iommu/vt-d: Make two functions static
iommu/vt-d: Use BUG_ON instead of if () BUG()
iommu/vt-d: Return false instead of 0 in irq_remapping_cap()
iommu/amd: Use BUG_ON instead of if () BUG()
iommu/amd: Make a symbol static
iommu/amd: Simplify allocation in irq_remapping_alloc()
iommu/tegra-smmu: Parameterize number of TLB lines
iommu/tegra-smmu: Factor out tegra_smmu_set_pde()
iommu/tegra-smmu: Extract tegra_smmu_pte_get_use()
iommu/tegra-smmu: Use __GFP_ZERO to allocate zeroed pages
iommu/tegra-smmu: Remove PageReserved manipulation
iommu/tegra-smmu: Convert to use DMA API
iommu/tegra-smmu: smmu_flush_ptc() wants device addresses
...
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Pull SG updates from Jens Axboe:
"This contains a set of scatter-gather related changes/fixes for 4.3:
- Add support for limited chaining of sg tables even for
architectures that do not set ARCH_HAS_SG_CHAIN. From Christoph.
- Add sg chain support to target_rd. From Christoph.
- Fixup open coded sg->page_link in crypto/omap-sham. From
Christoph.
- Fixup open coded crypto ->page_link manipulation. From Dan.
- Also from Dan, automated fixup of manual sg_unmark_end()
manipulations.
- Also from Dan, automated fixup of open coded sg_phys()
implementations.
- From Robert Jarzmik, addition of an sg table splitting helper that
drivers can use"
* 'for-4.3/sg' of git://git.kernel.dk/linux-block:
lib: scatterlist: add sg splitting function
scatterlist: use sg_phys()
crypto/omap-sham: remove an open coded access to ->page_link
scatterlist: remove open coded sg_unmark_end instances
crypto: replace scatterwalk_sg_chain with sg_chain
target/rd: always chain S/G list
scatterlist: allow limited chaining without ARCH_HAS_SG_CHAIN
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git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI updates from Bjorn Helgaas:
"PCI changes for the v4.3 merge window:
Enumeration:
- Allocate ATS struct during enumeration (Bjorn Helgaas)
- Embed ATS info directly into struct pci_dev (Bjorn Helgaas)
- Reduce size of ATS structure elements (Bjorn Helgaas)
- Stop caching ATS Invalidate Queue Depth (Bjorn Helgaas)
- iommu/vt-d: Cache PCI ATS state and Invalidate Queue Depth (Bjorn Helgaas)
- Move MPS configuration check to pci_configure_device() (Bjorn Helgaas)
- Set MPS to match upstream bridge (Keith Busch)
- ARM/PCI: Set MPS before pci_bus_add_devices() (Murali Karicheri)
- Add pci_scan_root_bus_msi() (Lorenzo Pieralisi)
- ARM/PCI, designware, xilinx: Use pci_scan_root_bus_msi() (Lorenzo Pieralisi)
Resource management:
- Call pci_read_bridge_bases() from core instead of arch code (Lorenzo Pieralisi)
PCI device hotplug:
- pciehp: Remove unused interrupt events (Bjorn Helgaas)
- pciehp: Remove ignored MRL sensor interrupt events (Bjorn Helgaas)
- pciehp: Handle invalid data when reading from non-existent devices (Jarod Wilson)
- pciehp: Simplify pcie_poll_cmd() (Yijing Wang)
- Use "slot" and "pci_slot" for struct hotplug_slot and struct pci_slot (Yijing Wang)
- Protect pci_bus->slots with pci_slot_mutex, not pci_bus_sem (Yijing Wang)
- Hold pci_slot_mutex while searching bus->slots list (Yijing Wang)
Power management:
- Disable async suspend/resume for JMicron multi-function SATA/AHCI (Zhang Rui)
Virtualization:
- Add ACS quirks for Intel I219-LM/V (Alex Williamson)
- Restore ACS configuration as part of pci_restore_state() (Alexander Duyck)
MSI:
- Add pcibios_alloc_irq() and pcibios_free_irq() (Jiang Liu)
- x86: Implement pcibios_alloc_irq() and pcibios_free_irq() (Jiang Liu)
- Add helpers to manage pci_dev->irq and pci_dev->irq_managed (Jiang Liu)
- Free legacy IRQ when enabling MSI/MSI-X (Jiang Liu)
- ARM/PCI: Remove msi_controller from struct pci_sys_data (Lorenzo Pieralisi)
- Remove unused pcibios_msi_controller() hook (Lorenzo Pieralisi)
Generic host bridge driver:
- Remove dependency on ARM-specific struct hw_pci (Jayachandran C)
- Build setup-irq.o for arm64 (Jayachandran C)
- Add arm64 support (Jayachandran C)
APM X-Gene host bridge driver:
- Add APM X-Gene PCIe 64-bit prefetchable window (Duc Dang)
- Add support for a 64-bit prefetchable memory window (Duc Dang)
- Drop owner assignment from platform_driver (Krzysztof Kozlowski)
Broadcom iProc host bridge driver:
- Allow BCMA bus driver to be built as module (Hauke Mehrtens)
- Delete unnecessary checks before phy calls (Markus Elfring)
- Add arm64 support (Ray Jui)
Synopsys DesignWare host bridge driver:
- Don't complain missing *config* reg space if va_cfg0 is set (Murali Karicheri)
TI DRA7xx host bridge driver:
- Disable pm_runtime on get_sync failure (Kishon Vijay Abraham I)
- Add PM support (Kishon Vijay Abraham I)
- Clear MSE bit during suspend so clocks will idle (Kishon Vijay Abraham I)
- Add support to make GPIO drive PERST# line (Kishon Vijay Abraham I)
Xilinx AXI host bridge driver:
- Check for MSI interrupt flag before handling as INTx (Russell Joyce)
Miscellaneous:
- Fix Intersil/Techwell TW686[4589] AV capture class code (Krzysztof Hałasa)
- Use PCI_CLASS_SERIAL_USB instead of bare number (Bjorn Helgaas)
- Fix generic NCR 53c810 class code quirk (Bjorn Helgaas)
- Fix TI816X class code quirk (Bjorn Helgaas)
- Remove unused "pci_probe" flags (Bjorn Helgaas)
- Host bridge driver code simplifications (Fabio Estevam)
- Add dev_flags bit to access VPD through function 0 (Mark Rustad)
- Add VPD function 0 quirk for Intel Ethernet devices (Mark Rustad)
- Kill off set_irq_flags() usage (Rob Herring)
- Remove Intel Cherrytrail D3 delays (Srinidhi Kasagar)
- Clean up pci_find_capability() (Wei Yang)"
* tag 'pci-v4.3-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (72 commits)
PCI: Disable async suspend/resume for JMicron multi-function SATA/AHCI
PCI: Set MPS to match upstream bridge
PCI: Move MPS configuration check to pci_configure_device()
PCI: Drop references acquired by of_parse_phandle()
PCI/MSI: Remove unused pcibios_msi_controller() hook
ARM/PCI: Remove msi_controller from struct pci_sys_data
ARM/PCI, designware, xilinx: Use pci_scan_root_bus_msi()
PCI: Add pci_scan_root_bus_msi()
ARM/PCI: Replace panic with WARN messages on failures
PCI: generic: Add arm64 support
PCI: Build setup-irq.o for arm64
PCI: generic: Remove dependency on ARM-specific struct hw_pci
PCI: imx6: Simplify a trivial if-return sequence
PCI: spear: Use BUG_ON() instead of condition followed by BUG()
PCI: dra7xx: Remove unneeded use of IS_ERR_VALUE()
PCI: Remove pci_ats_enabled()
PCI: Stop caching ATS Invalidate Queue Depth
PCI: Move ATS declarations to linux/pci.h so they're all together
PCI: Clean up ATS error handling
PCI: Use pci_physfn() rather than looking up physfn by hand
...
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There is a bug in iommu_context_addr() which will always use
the lower context table, even when the upper context table
needs to be used. Fix this issue.
Fixes: 03ecc32c5274 ("iommu/vt-d: support extended root and context entries")
Reported-by: Xiao, Nan <nan.xiao@hp.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Coccinelle cleanup to replace open coded sg to physical address
translations. This is in preparation for introducing scatterlists that
reference __pfn_t.
// sg_phys.cocci: convert usage page_to_phys(sg_page(sg)) to sg_phys(sg)
// usage: make coccicheck COCCI=sg_phys.cocci MODE=patch
virtual patch
@@
struct scatterlist *sg;
@@
- page_to_phys(sg_page(sg)) + sg->offset
+ sg_phys(sg)
@@
struct scatterlist *sg;
@@
- page_to_phys(sg_page(sg))
+ sg_phys(sg) & PAGE_MASK
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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