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* intel-iommu: Kill pointless intel_unmap_single() functionDavid Woodhouse2009-07-15
| | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Defer the iotlb flush and iova free for intel_unmap_sg() too.David Woodhouse2009-07-15
| | | | | | I see no reason why we did this _only_ in intel_unmap_page(). Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Remove superfluous iova_alloc_lock from IOVA codeDavid Woodhouse2009-07-15
| | | | | | | | | We only ever obtain this lock immediately before the iova_rbtree_lock, and release it immediately after the iova_rbtree_lock. So ditch it and just use iova_rbtree_lock. [v2: Remove the lockdep bits this time too] Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Speed up map routines by using cached domain ASAPDavid Woodhouse2009-07-07
| | | | | | | | | | | | We did before, in the end -- but it was at the bottom of a long stack of functions. Add an inline wrapper get_valid_domain_for_dev() which will use the cached one _first_ and only make the out-of-line call if it's not already set. This takes the average time taken for a 1-page intel_map_sg() from 5961 cycles to 4812 cycles on my Lenovo x200s test box -- a modest 20%. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Don't use identity mapping for PCI devices behind bridgesDavid Woodhouse2009-07-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Our current strategy for pass-through mode is to put all devices into the 1:1 domain at startup (which is before we know what their dma_mask will be), and only _later_ take them out of that domain, if it turns out that they really can't address all of memory. However, when there are a bunch of PCI devices behind a bridge, they all end up with the same source-id on their DMA transactions, and hence in the same IOMMU domain. This means that we _can't_ easily move them from the 1:1 domain into their own domain at runtime, because there might be DMA in-flight from their siblings. So we have to adjust our pass-through strategy: For PCI devices not on the root bus, and for the bridges which will take responsibility for their transactions, we have to start up _out_ of the 1:1 domain, just in case. This fixes the BUG() we see when we have 32-bit-capable devices behind a PCI-PCI bridge, and use the software identity mapping. It does mean that we might end up using 'normal' mapping mode for some devices which could actually live with the faster 1:1 mapping -- but this is only for PCI devices behind bridges, which presumably aren't the devices for which people are most concerned about performance. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Use iommu_should_identity_map() at startup time too.David Woodhouse2009-07-04
| | | | | | | At boot time, the dma_mask won't have been set on any devices, so we assume that all devices will be 64-bit capable (and thus get a 1:1 map). Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: No mapping for non-PCI devicesDavid Woodhouse2009-07-04
| | | | | | | | This should fix kernel.org bug #11821, where the dcdbas driver makes up a platform device and then uses dma_alloc_coherent() on it, in an attempt to get memory < 4GiB. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Restore DMAR_BROKEN_GFX_WA option for broken graphics driversDavid Woodhouse2009-07-04
| | | | | | | | We need to give people a little more time to fix the broken drivers. Re-introduce this, but tied in properly with the 'iommu=pt' support this time. Change the config option name and make it default to 'no' too. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Add iommu_should_identity_map() functionDavid Woodhouse2009-07-04
| | | | | | | We do this twice, and it's about to get more complicated. This makes the code slightly clearer about what it's doing, too. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Fix reattaching of devices to identity mapping domainDavid Woodhouse2009-07-04
| | | | | | | | | | | | | When we reattach a device to the si_domain (because it's been removed from a VM), we weren't calling domain_context_mapping() to actually tell the hardware about that. We should really put the call to domain_context_mapping() into domain_add_dev_info() -- we never call the latter without also doing the former, and we can keep the error paths simple that way. But that's a cleanup which can wait for 2.6.32 now. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Don't set identity mapping for bypassed graphics devicesDavid Woodhouse2009-07-04
| | | | | | | | We should check iommu_dummy() _first_, because that means it's attached to an iommu that we've just disabled completely. At the moment, we might try to put the device into the identity mapping domain. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* intel-iommu: Fix dma vs. mm page confusion with aligned_nrpages()David Woodhouse2009-07-04
| | | | | | | | | | The aligned_nrpages() function rounds up to the next VM page, but returns its result as a number of DMA pages. Purely theoretical except on IA64, which doesn't boot with VT-d right now anyway. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* Merge git://git.infradead.org/iommu-2.6Linus Torvalds2009-07-02
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * git://git.infradead.org/iommu-2.6: (38 commits) intel-iommu: Don't keep freeing page zero in dma_pte_free_pagetable() intel-iommu: Introduce first_pte_in_page() to simplify PTE-setting loops intel-iommu: Use cmpxchg64_local() for setting PTEs intel-iommu: Warn about unmatched unmap requests intel-iommu: Kill superfluous mapping_lock intel-iommu: Ensure that PTE writes are 64-bit atomic, even on i386 intel-iommu: Make iommu=pt work on i386 too intel-iommu: Performance improvement for dma_pte_free_pagetable() intel-iommu: Don't free too much in dma_pte_free_pagetable() intel-iommu: dump mappings but don't die on pte already set intel-iommu: Combine domain_pfn_mapping() and domain_sg_mapping() intel-iommu: Introduce domain_sg_mapping() to speed up intel_map_sg() intel-iommu: Simplify __intel_alloc_iova() intel-iommu: Performance improvement for domain_pfn_mapping() intel-iommu: Performance improvement for dma_pte_clear_range() intel-iommu: Clean up iommu_domain_identity_map() intel-iommu: Remove last use of PHYSICAL_PAGE_MASK, for reserving PCI BARs intel-iommu: Make iommu_flush_iotlb_psi() take pfn as argument intel-iommu: Change aligned_size() to aligned_nrpages() intel-iommu: Clean up intel_map_sg(), remove domain_page_mapping() ...
| * intel-iommu: Don't keep freeing page zero in dma_pte_free_pagetable()David Woodhouse2009-07-02
| | | | | | | | | | | | | | Check dma_pte_present() and only free the page if there _is_ one. Kind of surprising that there was no warning about this. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Introduce first_pte_in_page() to simplify PTE-setting loopsDavid Woodhouse2009-07-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | On Wed, 2009-07-01 at 16:59 -0700, Linus Torvalds wrote: > I also _really_ hate how you do > > (unsigned long)pte >> VTD_PAGE_SHIFT == > (unsigned long)first_pte >> VTD_PAGE_SHIFT Kill this, in favour of just looking to see if the incremented pte pointer has 'wrapped' onto the next page. Which means we have to check it _after_ incrementing it, not before. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Use cmpxchg64_local() for setting PTEsDavid Woodhouse2009-07-01
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Warn about unmatched unmap requestsDavid Woodhouse2009-07-01
| | | | | | | | | | | | | | This would have found the bug in i386 pci_unmap_addr() a long time ago. We shouldn't just silently return without doing anything. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Kill superfluous mapping_lockDavid Woodhouse2009-07-01
| | | | | | | | | | | | | | | | | | Since we're using cmpxchg64() anyway (because that's the only way to do an atomic 64-bit store on i386), we might as well ditch the extra locking and just use cmpxchg64() to ensure that we don't add the page twice. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Ensure that PTE writes are 64-bit atomic, even on i386David Woodhouse2009-07-01
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Performance improvement for dma_pte_free_pagetable()David Woodhouse2009-06-29
| | | | | | | | | | | | | | As with other functions, batch the CPU data cache flushes and don't keep recalculating PTE addresses. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Don't free too much in dma_pte_free_pagetable()David Woodhouse2009-06-29
| | | | | | | | | | | | | | | | The loop condition was wrong -- we should free a PMD only if its _entire_ range is within the range we're intending to clear. The early-termination condition was right, but not the loop. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: dump mappings but don't die on pte already setDavid Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Combine domain_pfn_mapping() and domain_sg_mapping()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Introduce domain_sg_mapping() to speed up intel_map_sg()David Woodhouse2009-06-29
| | | | | | | | | | | | | | | | | | Instead of calling domain_pfn_mapping() repeatedly with single or small numbers of pages, just pass the sglist in. It can optimise the number of cache flushes like domain_pfn_mapping() does, and gives a huge speedup for large scatterlists. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Simplify __intel_alloc_iova()David Woodhouse2009-06-29
| | | | | | | | | | | | | | | | There's no need for the separate iommu_alloc_iova() function, and certainly not for it to be global. Remove the underscores while we're at it. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Performance improvement for domain_pfn_mapping()David Woodhouse2009-06-29
| | | | | | | | | | | | | | | | As with dma_pte_clear_range(), don't keep flushing a single PTE at a time. And also micro-optimise the setting of PTE values rather than using the helper functions to do all the masking. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Performance improvement for dma_pte_clear_range()David Woodhouse2009-06-29
| | | | | | | | | | | | | | | | | | It's a bit silly to repeatedly call domain_flush_cache() for each PTE individually, as we clear it. Instead, batch them up and flush a whole range at a time. We might as well refrain from recalculating the PTE address from scratch each time round the loop too. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Clean up iommu_domain_identity_map()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Remove last use of PHYSICAL_PAGE_MASK, for reserving PCI BARsDavid Woodhouse2009-06-29
| | | | | | | | | | | | | | This is fairly broken anyway -- it doesn't take hotplug into account. We should probably be checking page_is_ram() instead. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Make iommu_flush_iotlb_psi() take pfn as argumentDavid Woodhouse2009-06-29
| | | | | | | | | | | | | | Most of its callers are having to shift for themselves anyway, so we might as well do it in iommu_flush_iotlb_psi(). Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Change aligned_size() to aligned_nrpages()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Clean up intel_map_sg(), remove domain_page_mapping()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Use domain_pfn_mapping() in intel_iommu_map_range()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Use domain_pfn_mapping() in __intel_map_single()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Introduce domain_pfn_mapping()David Woodhouse2009-06-29
| | | | | | | | | | | | | | | | | | | | ... and use it in the trivial cases; the other callers want individual (and bisectable) attention, since I screwed them up the first time... Make the BUG_ON() happen on too-large virtual address rather than physical address, too. That's the one we care about. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Clean up address handling in domain_page_mapping()David Woodhouse2009-06-29
| | | | | | | | | | | | No more masking and alignment; just use pfns. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Change addr_to_dma_pte() to pfn_to_dma_pte()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Clean up intel_iommu_unmap_range()David Woodhouse2009-06-29
| | | | | | | | | | | | | | Use unaligned address for domain->max_addr. That algorithm isn't ideal anyway -- we should probably just look at the last iova in the tree. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Make dma_pte_free_pagetable() take pfns as argumentDavid Woodhouse2009-06-29
| | | | | | | | | | | | | | With some cleanup of intel_unmap_page(), intel_unmap_sg() and vm_domain_exit() to no longer play with 64-bit addresses. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Make dma_pte_free_pagetable() use pfnsDavid Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Make dma_pte_clear_range() take pfns as argumentDavid Woodhouse2009-06-29
| | | | | | | | | | | | Noting that this is now an _inclusive_ range. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Make dma_pte_clear_range() use pfnsDavid Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Don't just mask out too-big physical addresses; BUG() insteadDavid Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Make dma_pte_clear_one() take pfn not addressDavid Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Change dma_addr_level_pte() to dma_pfn_level_pte()David Woodhouse2009-06-29
| | | | | | | | Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Change address_level_offset() to pfn_level_offset()David Woodhouse2009-06-29
| | | | | | | | | | | | We're shifting the inputs for now, but that'll change... Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Change dma_set_pte_addr() to dma_set_pte_pfn()David Woodhouse2009-06-29
| | | | | | | | | | | | | | Add some helpers for converting between VT-d and normal system pfns, since system pages can be larger than VT-d pages. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Clean up identity mapping code, remove CONFIG_DMAR_GFX_WADavid Woodhouse2009-06-29
| | | | | | | | | | | | | | | | | | | | | | | | There's no need for the GFX workaround now we have 'iommu=pt' for the cases where people really care about performance. There's no need to have a special case for just one type of device. This also speeds up the iommu=pt path and reduces memory usage by setting up the si_domain _once_ and then using it for all devices, rather than giving each device its own private page tables. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Create new iommu_domain_identity_map() functionDavid Woodhouse2009-06-29
| | | | | | | | | | | | We'll want to do this to a _domain_ (the si_domain) rather than a PCI device. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| * intel-iommu: Only avoid flushing device IOTLB for domain ID 0 in caching modeYu Zhao2009-06-29
| | | | | | | | | | | | | | | | | | | | | | In caching mode, domain ID 0 is reserved for non-present to present mapping flush. Device IOTLB doesn't need to be flushed in this case. Previously we were avoiding the flush for domain zero, even if the IOMMU wasn't in caching mode and domain zero wasn't special. Signed-off-by: Yu Zhao <yu.zhao@intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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