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* dma-debug: Fix the overlap() function to be correct and readableIngo Molnar2009-07-101-12/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Linus noticed how unclean and buggy the overlap() function is: - It uses convoluted (and bug-causing) positive checks for range overlap - instead of using a more natural negative check. - Even the positive checks are buggy: a positive intersection check has four natural cases while we checked only for three, missing the (addr < start && addr2 == end) case for example. - The variables are mis-named, making it non-obvious how the check was done. - It needlessly uses u64 instead of unsigned long. Since these are kernel memory pointers and we explicitly exclude highmem ranges anyway we cannot ever overflow 32 bits, even if we could. (and on 64-bit it doesnt matter anyway) All in one, this function needs a total revamp. I used Linus's suggestions minus the paranoid checks (we cannot overflow really because if we get totally bad DMA ranges passed far more things break in the systems than just DMA debugging). I also fixed a few other small details i noticed. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* dma-debug: Put all hash-chain locks into the same lock classIngo Molnar2009-06-171-1/+1
| | | | | | | | | | | | | | | | | | | | | Alan Cox reported that lockdep runs out of its stack-trace entries with certain configs: BUG: MAX_STACK_TRACE_ENTRIES too low This happens because there are 1024 hash buckets, each with a separate lock. Lockdep puts each lock into a separate lock class and tracks them independently. But in reality we never take more than one of the buckets, so they really belong into a single lock-class. Annotate the has bucket lock init accordingly. [ Impact: reduce the lockdep footprint of dma-debug ] Reported-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: fix off-by-one error in overlap functionJoerg Roedel2009-06-161-1/+1
| | | | | | | | | | This patch fixes a bug in the overlap function which returned true if one region ends exactly before the second region begins. This is no overlap but the function returned true in that case. Cc: stable@kernel.org Reported-by: Andrew Randrianasulu <randrik@mail.ru> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: be more careful when building reference entriesJoerg Roedel2009-06-151-43/+91
| | | | | | | | | The current code is not very careful when it builds reference dma_debug_entries which get passed to hash_bucket_find(). But since this function changed to a best-fit algorithm these entries have to be more acurate. This patch adds this higher level of accuracy. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: check for sg_call_ents in best-fit algorithm tooJoerg Roedel2009-06-151-8/+7
| | | | | | | If we don't check for sg_call_ents the hash_bucket_find function might still return the wrong dma_debug_entry for sg mappings. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: simplify logic in driver_filter()Joerg Roedel2009-06-081-21/+21
| | | | | | | | This patch makes the driver_filter function more readable by reorganizing the code. The removal of a code code block to an upper indentation level makes hard-to-read line-wraps unnecessary. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: disable/enable irqs only once in device_dma_allocationsJoerg Roedel2009-06-081-2/+6
| | | | | | | There is no need to disable/enable irqs on each loop iteration. Just disable irqs for the whole time the loop runs. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: use pr_* instead of printk(KERN_* ...)Joerg Roedel2009-06-081-21/+15
| | | | | | | | | The pr_* macros are shorter than the old printk(KERN_ ...) variant. Change the dma-debug code to use the new macros and save a few unnecessary line breaks. If lines don't break the source code can also be grepped more easily. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: code style fixesJoerg Roedel2009-06-081-11/+12
| | | | | | | This patch changes the recent updates to dma-debug to conform with coding style guidelines of Linux and the -tip tree. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: comment style fixesJoerg Roedel2009-06-081-2/+3
| | | | | | | Last patch series introduced some new comment which does not fit the Kernel comment style guidelines. Fix it with this patch. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* Merge branch 'dma-debug/2.6.31' of ↵Ingo Molnar2009-06-071-22/+269
|\ | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into core/iommu
| * Merge branches 'dma-debug/fixes' and 'dma-debug/driver-filter' into ↵Joerg Roedel2009-06-021-1/+166
| |\ | | | | | | | | | dma-debug/2.6.31
| | * dma-debug: add dma_debug_driver kernel command lineJoerg Roedel2009-06-021-0/+18
| | | | | | | | | | | | | | | | | | | | | This patch add the dma_debug_driver= boot parameter to enable the driver filter for early boot. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| | * dma-debug: add debugfs file for driver filterJoerg Roedel2009-06-021-1/+101
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the dma-api/driver_filter file to debugfs. The root user can write a driver name into this file to see only dma-api errors for that particular driver in the kernel log. Writing an empty string to that file disables the driver filter. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| | * dma-debug: add variables and checks for driver filterJoerg Roedel2009-06-021-1/+48
| | | | | | | | | | | | | | | | | | | | | | | | This patch adds the state variables for the driver filter and a function to check if the filter is enabled and matches to the current device. The check is built into the err_printk function. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| * | dma-debug: fix debug_dma_sync_sg_for_cpu and debug_dma_sync_sg_for_deviceFUJITA Tomonori2009-05-291-11/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | DMA-mapping.txt says that debug_dma_sync_sg family must be called with the _same_ one you passed into the dma_map_sg call, it should _NOT_ be the 'count' value _returned_ from the dma_map_sg call. debug_dma_sync_sg_for_cpu and debug_dma_sync_sg_for_device can't handle this properly; they need to use the sg_mapped_ents in struct dma_debug_entry as debug_dma_unmap_sg() does. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| * | dma-debug: use sg_dma_len accessorFUJITA Tomonori2009-05-291-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | debug_dma_map_sg() and debug_dma_unmap_sg() use length in struct scatterlist while debug_dma_sync_sg_for_cpu() and debug_dma_sync_sg_for_device() use dma_length. This causes bugs warnings on some IOMMU implementations since these values are not same; the length doesn't represent the dma length. We always need to use sg_dma_len() accessor to get the dma length of a scatterlist entry. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| * | dma-debug: use sg_dma_address accessor instead of using dma_address directlyFUJITA Tomonori2009-05-291-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | Architectures might not have dma_address in struct scatterlist (PARISC doesn't). Directly accessing to dma_address in struct scatterlist is wrong; we need to use sg_dma_address() accesssor instead. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| * | dma-debug: re-add dma memory leak detectionJoerg Roedel2009-05-281-1/+57
| |/ | | | | | | | | | | | | This is basically a revert of commit 314eeac9 but now in a fixed version. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* | dma-debug: change hash_bucket_find from first-fit to best-fitJoerg Roedel2009-06-071-4/+39
|/ | | | | | | | | | | | | | | | | | | | | | | | | Some device drivers map the same physical address multiple times to a dma address. Without an IOMMU this results in the same dma address being put into the dma-debug hash multiple times. With a first-fit match in hash_bucket_find() this function may return the wrong dma_debug_entry. This can result in false positive warnings. This patch fixes it by changing the first-fit behavior of hash_bucket_find() into a best-fit algorithm. Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com> Reported-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Cc: lethal@linux-sh.org Cc: just.for.lkml@googlemail.com Cc: hancockrwd@gmail.com Cc: jens.axboe@oracle.com Cc: bharrosh@panasas.com Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: <stable@kernel.org> LKML-Reference: <20090605104132.GE24836@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Merge commit 'v2.6.30-rc5' into core/iommuIngo Molnar2009-05-111-52/+1
|\ | | | | | | | | | | | | Merge reason: core/iommu was on an .30-rc1 base, update it to .30-rc5 to refresh. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * dma-debug: remove broken dma memory leak detection for 2.6.30Joerg Roedel2009-04-261-52/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The feature needs some more work because the notfier which is used to check for pending allocations is called before the device drivers ->remove() function. Therefore this feature reports false positives. A real fix for this issue is to introduce a new notifier event which sent _after_ the driver has deinitialized itself. That will done for the next kernel version. [ Impact: reduce the scope of CONFIG_DMA_API_DEBUG=y checks ] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Cc: iommu@lists.linux-foundation.org LKML-Reference: <1240576557-22442-1-git-send-email-joerg.roedel@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | dma-debug: add dma_debug_resize_entries() to adjust the number of ↵FUJITA Tomonori2009-04-151-6/+66
|/ | | | | | | | | | | | | | | | | | | | | dma_debug_entries We use a static value for the number of dma_debug_entries. It can be overwritten by a kernel command line option. Some IOMMUs (e.g. GART) can't set an appropriate value by a kernel command line option because they can't know such value until they finish initializing up their hardware. This patch adds dma_debug_resize_entries() enables IOMMUs to adjust the number of dma_debug_entries anytime. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Joerg Roedel <joerg.roedel@amd.com> Cc: fujita.tomonori@lab.ntt.co.jp Cc: akpm@linux-foundation.org LKML-Reference: <20090415182234R.fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* dma-debug: fix printk formats (i386)Randy Dunlap2009-03-301-4/+4
| | | | | | | | | | | | Fix printk format warnings in dma-debug: lib/dma-debug.c:645: warning: format '%016llx' expects type 'long long unsigned int', but argument 6 has type 'dma_addr_t' lib/dma-debug.c:662: warning: format '%016llx' expects type 'long long unsigned int', but argument 6 has type 'dma_addr_t' lib/dma-debug.c:676: warning: format '%016llx' expects type 'long long unsigned int', but argument 6 has type 'dma_addr_t' lib/dma-debug.c:686: warning: format '%016llx' expects type 'long long unsigned int', but argument 6 has type 'dma_addr_t' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* dma-debug: make memory range checks more consistentJoerg Roedel2009-03-241-5/+8
| | | | | | | | | | | | | | | | Impact: extend on-kernel-stack DMA debug checks to all !highmem pages We only checked dma_map_single() - extend it to dma_map_page() and dma_map_sg() as well. Also, fix dma_map_single() corner case bug: make sure we dont stack-check highmem (not mapped) pages. Reported-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Cc: iommu@lists.linux-foundation.org LKML-Reference: <1237818908-26516-1-git-send-email-joerg.roedel@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* dma-debug: warn of unmapping an invalid dma addressFUJITA Tomonori2009-03-191-1/+4
| | | | | | | | | | | | Impact: extend DMA-debug checks Calling dma_unmap families against an invalid dma address should be a bug. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Joerg Roedel <joerg.roedel@amd.com> LKML-Reference: <20090319103743N.fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* dma-debug: add a check dma memory leaksJoerg Roedel2009-03-171-0/+55
| | | | | | | | | Impact: allow architectures to monitor busses for dma mem leakage This patch adds checking code to detect if a device has pending DMA operations when it is about to be unbound from its device driver. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add checks for kernel text and rodataJoerg Roedel2009-03-171-1/+25
| | | | | | | | | Impact: get notified if a device dma maps illegal areas This patch adds a check to print a warning message when a device driver tries to map a memory area from the kernel text segment or rodata. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: print stacktrace of mapping path on unmap errorDavid Woodhouse2009-03-171-14/+38
| | | | | | | Impact: saves stacktrace of a dma mapping and prints it if there is an error Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add function to dump dma mappingsDavid Woodhouse2009-03-171-0/+30
| | | | | | | | | | | | This adds a function to dump the DMA mappings that the debugging code is aware of -- either for a single device, or for _all_ devices. This can be useful for debugging -- sticking a call to it in the DMA page fault handler, for example, to see if the faulting address _should_ be mapped or not, and hence work out whether it's IOMMU bugs we're seeing, or driver bugs. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* dma-debug: add checks for sync_single_sg_*Joerg Roedel2009-03-051-0/+32
| | | | | | Impact: add debug callbacks for dma_sync_sg_* functions Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add checks for sync_single_range_*Joerg Roedel2009-03-051-0/+24
| | | | | | Impact: add debug callbacks for dma_sync_single_range_for_* functions Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add checks for sync_single_*Joerg Roedel2009-03-051-0/+21
| | | | | | Impact: add debug callbacks for dma_sync_single_for_* functions Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add checking for [alloc|free]_coherentJoerg Roedel2009-03-051-0/+45
| | | | | | Impact: add debug callbacks for dma_[alloc|free]_coherent Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add add checking for map/unmap_sgJoerg Roedel2009-03-051-0/+73
| | | | | | Impact: add debug callbacks for dma_{un}map_sg Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add checking for map/unmap_page/singleJoerg Roedel2009-03-051-0/+53
| | | | | | Impact: add debug callbacks for dma_{un}map_[page|single] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add core checking functionsJoerg Roedel2009-03-051-1/+187
| | | | | | Impact: add functions to check on dma unmap and sync Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add debugfs interfaceJoerg Roedel2009-03-051-0/+78
| | | | | | Impact: add debugfs interface for configuring DMA-API debugging Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add kernel command line parametersJoerg Roedel2009-03-051-0/+38
| | | | | | Impact: add dma_debug= and dma_debug_entries= kernel parameters Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add initialization codeJoerg Roedel2009-03-051-0/+66
| | | | | | Impact: add code to initialize dma-debug core data structures Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add allocator codeJoerg Roedel2009-03-051-0/+57
| | | | | | Impact: add allocator code for struct dma_debug_entry Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add hash functions for dma_debug_entriesJoerg Roedel2009-03-051-0/+101
| | | | | | Impact: implement necessary functions for the core hash Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
* dma-debug: add header file and core data structuresJoerg Roedel2009-03-051-0/+42
Impact: add groundwork for DMA-API debugging Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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