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2016-06-27iommu/iova: Disable preemption around use of this_cpu_ptr()Chris Wilson1-2/+6
Between acquiring the this_cpu_ptr() and using it, ideally we don't want to be preempted and work on another CPU's private data. this_cpu_ptr() checks whether or not preemption is disable, and get_cpu_ptr() provides a convenient wrapper for operating on the cpu ptr inside a preemption disabled critical section (which currently is provided by the spinlock). [ 167.997877] BUG: using smp_processor_id() in preemptible [00000000] code: usb-storage/216 [ 167.997940] caller is debug_smp_processor_id+0x17/0x20 [ 167.997945] CPU: 7 PID: 216 Comm: usb-storage Tainted: G U 4.7.0-rc1-gfxbench-RO_Patchwork_1057+ #1 [ 167.997948] Hardware name: Hewlett-Packard HP Pro 3500 Series/2ABF, BIOS 8.11 10/24/2012 [ 167.997951] 0000000000000000 ffff880118b7f9c8 ffffffff8140dca5 0000000000000007 [ 167.997958] ffffffff81a3a7e9 ffff880118b7f9f8 ffffffff8142a927 0000000000000000 [ 167.997965] ffff8800d499ed58 0000000000000001 00000000000fffff ffff880118b7fa08 [ 167.997971] Call Trace: [ 167.997977] [<ffffffff8140dca5>] dump_stack+0x67/0x92 [ 167.997981] [<ffffffff8142a927>] check_preemption_disabled+0xd7/0xe0 [ 167.997985] [<ffffffff8142a947>] debug_smp_processor_id+0x17/0x20 [ 167.997990] [<ffffffff81507e17>] alloc_iova_fast+0xb7/0x210 [ 167.997994] [<ffffffff8150c55f>] intel_alloc_iova+0x7f/0xd0 [ 167.997998] [<ffffffff8151021d>] intel_map_sg+0xbd/0x240 [ 167.998002] [<ffffffff810e5efd>] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 167.998009] [<ffffffff81596059>] usb_hcd_map_urb_for_dma+0x4b9/0x5a0 [ 167.998013] [<ffffffff81596d19>] usb_hcd_submit_urb+0xe9/0xaa0 [ 167.998017] [<ffffffff810cff2f>] ? mark_held_locks+0x6f/0xa0 [ 167.998022] [<ffffffff810d525c>] ? __raw_spin_lock_init+0x1c/0x50 [ 167.998025] [<ffffffff810e5efd>] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 167.998028] [<ffffffff815988f3>] usb_submit_urb+0x3f3/0x5a0 [ 167.998032] [<ffffffff810d0082>] ? trace_hardirqs_on_caller+0x122/0x1b0 [ 167.998035] [<ffffffff81599ae7>] usb_sg_wait+0x67/0x150 [ 167.998039] [<ffffffff815dc202>] usb_stor_bulk_transfer_sglist.part.3+0x82/0xd0 [ 167.998042] [<ffffffff815dc29c>] usb_stor_bulk_srb+0x4c/0x60 [ 167.998045] [<ffffffff815dc42e>] usb_stor_Bulk_transport+0x17e/0x420 [ 167.998049] [<ffffffff815dcf32>] usb_stor_invoke_transport+0x242/0x540 [ 167.998052] [<ffffffff810e5efd>] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 167.998058] [<ffffffff815dba19>] usb_stor_transparent_scsi_command+0x9/0x10 [ 167.998061] [<ffffffff815de518>] usb_stor_control_thread+0x158/0x260 [ 167.998064] [<ffffffff815de3c0>] ? fill_inquiry_response+0x20/0x20 [ 167.998067] [<ffffffff815de3c0>] ? fill_inquiry_response+0x20/0x20 [ 167.998071] [<ffffffff8109ddfa>] kthread+0xea/0x100 [ 167.998078] [<ffffffff817ac6af>] ret_from_fork+0x1f/0x40 [ 167.998081] [<ffffffff8109dd10>] ? kthread_create_on_node+0x1f0/0x1f0 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96293 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org Fixes: 9257b4a206fc ('iommu/iova: introduce per-cpu caching to iova allocation') Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-04-20iommu/iova: introduce per-cpu caching to iova allocationOmer Peleg1-24/+393
IOVA allocation has two problems that impede high-throughput I/O. First, it can do a linear search over the allocated IOVA ranges. Second, the rbtree spinlock that serializes IOVA allocations becomes contended. Address these problems by creating an API for caching allocated IOVA ranges, so that the IOVA allocator isn't accessed frequently. This patch adds a per-CPU cache, from which CPUs can alloc/free IOVAs without taking the rbtree spinlock. The per-CPU caches are backed by a global cache, to avoid invoking the (linear-time) IOVA allocator without needing to make the per-CPU cache size excessive. This design is based on magazines, as described in "Magazines and Vmem: Extending the Slab Allocator to Many CPUs and Arbitrary Resources" (currently available at https://www.usenix.org/legacy/event/usenix01/bonwick.html) Adding caching on top of the existing rbtree allocator maintains the property that IOVAs are densely packed in the IO virtual address space, which is important for keeping IOMMU page table usage low. To keep the cache size reasonable, we bound the IOVA space a CPU can cache by 32 MiB (we cache a bounded number of IOVA ranges, and only ranges of size <= 128 KiB). The shared global cache is bounded at 4 MiB of IOVA space. 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>
2015-07-28iommu: Make the iova library a moduleSakari Ailus1-0/+4
The iova library has use outside the intel-iommu driver, thus make it a module. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2015-07-28iommu: iova: Export symbolsSakari Ailus1-0/+10
Use EXPORT_SYMBOL_GPL() to export the iova library symbols. The symbols include: init_iova_domain(); iova_cache_get(); iova_cache_put(); iova_cache_init(); alloc_iova(); find_iova(); __free_iova(); free_iova(); put_iova_domain(); reserve_iova(); copy_reserved_iova(); Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2015-07-28iommu: iova: Move iova cache management to the iova librarySakari Ailus1-34/+49
This is necessary to separate intel-iommu from the iova library. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2015-07-28iommu/iova: Avoid over-allocating when size-alignedRobin Murphy1-17/+6
Currently, allocating a size-aligned IOVA region quietly adjusts the actual allocation size in the process, returning a rounded-up power-of-two-sized allocation. This results in mismatched behaviour in the IOMMU driver if the original size was not a power of two, where the original size is mapped, but the rounded-up IOVA size is unmapped. Whilst some IOMMUs will happily unmap already-unmapped pages, others consider this an error, so fix it by computing the necessary alignment padding without altering the actual allocation size. Also clean up by making pad_size unsigned, since its callers always pass unsigned values and negative padding makes little sense here anyway. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2015-05-05iommu: Fix checkpatch warnings for Missing a blank line after declarationsRobert Callicotte1-0/+4
Fixed checkpatch warnings for missing blank line after declaration of struct. Signed-off-by: Robert Callicotte <rcallicotte@gmail.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-01-19iommu: Make IOVA domain page size explicitRobin Murphy1-2/+10
Systems may contain heterogeneous IOMMUs supporting differing minimum page sizes, which may also not be common with the CPU page size. Thus it is practical to have an explicit notion of IOVA granularity to simplify handling of mapping and allocation constraints. As an initial step, move the IOVA page granularity from an implicit compile-time constant to a per-domain property so we can make use of it in IOVA domain context at runtime. To keep the abstraction tidy, extend the little API of inline iova_* helpers to parallel some of the equivalent PAGE_* macros. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-01-19iommu: Make IOVA domain low limit flexibleRobin Murphy1-4/+6
To share the IOVA allocator with other architectures, it needs to accommodate more general aperture restrictions; move the lower limit from a compile-time constant to a runtime domain property to allow IOVA domains with different requirements to co-exist. Also reword the slightly unclear description of alloc_iova since we're touching it anyway. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-01-19iommu: Consolidate IOVA allocator codeRobin Murphy1-0/+35
In order to share the IOVA allocator with other architectures, break the unnecssary dependency on the Intel IOMMU driver and move the remaining IOVA internals to iova.c Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
2014-03-04iommu/vt-d: Update IOMMU state when memory hotplug happensJiang Liu1-6/+58
If static identity domain is created, IOMMU driver needs to update si_domain page table when memory hotplug event happens. Otherwise PCI device DMA operations can't access the hot-added memory regions. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
2012-07-24iommu: Fix typo in iommuMasanari Iida1-7/+7
Correct spelling typo in debug messages and comments in drivers/iommu. Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-06-21x86/ia64: intel-iommu: move to drivers/iommu/Ohad Ben-Cohen1-0/+435
This should ease finding similarities with different platforms, with the intention of solving problems once in a generic framework which everyone can use. Note: to move intel-iommu.c, the declaration of pci_find_upstream_pcie_bridge() has to move from drivers/pci/pci.h to include/linux/pci.h. This is handled in this patch, too. As suggested, also drop DMAR's EXPERIMENTAL tag while we're at it. Compile-tested on x86_64. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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