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path: root/drivers/iommu/iommu-debug.c (follow)
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* iommu: iommu-debug: don't pass null character to copy_to_userVijayanand Jitta2019-02-14
| | | | | | | | | Doing a cat on pte,test_virt_addr from adb shell prints a null character as well which is at the end of the string this is not required so, don't pass this null character to copy_to_user. Change-Id: I8d9120f64d1df84a704379eb00bd239fc7059e9e Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
* iommu/iommu-debug: fix buffer overflows in debugfs read functionsSrinivasarao P2019-01-08
| | | | | | | | | The kernel buffer 'ubuf' can overflow while copying data to user space in debugfs read functions. Fix it by limiting the length of data to be copied to userspace. Change-Id: Ibb3d8c4fb637ddc0e63677ec2dff14a4cf8c0c73 Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
* iommu/debug: Remove dependency on CONFIG_IOMMU_DEBUG_TRACKINGVivek Kumar2018-09-25
| | | | | | | | | Compile 'iommu_debug_attr_to_string' function only when CONFIG_IOMMU_TESTS is enabled ,because it is called only from iommu test functions. Change-Id: Ifb3624690abc8134c1176b8915dc1cfe0454a91e Signed-off-by: Vivek Kumar <vivekuma@codeaurora.org>
* iommu/debug: Add mutex to make attach/detach thread safeVENKATA RAO KAKANI2018-07-13
| | | | | | | | | | | | | | This mutex lock will help to synchronise the usage of iommu domain structure which is getting used by multiple threads to perform iommu attach and iommu detach in case of any error. Without this change we are seeing page poisoning - write after free when running stress tests using iommu-debug test cases. Change-Id: I388a90084ab8cc7e7097bac9a41ed5fed6dad312 Acked-by: Ankur Saxena <c_ankusa@qti.qualcomm.com> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> Signed-off-by: VENKATA RAO KAKANI <vkakani@codeaurora.org>
* iommu/debug: Add mutex to make attach/detach thread safeVivek Gautam2018-07-09
| | | | | | | | | | | | | This mutex lock will help to synchronise the usage of iommu domain structure which is getting used by multiple threads to perform iommu attach and iommu detach in case of any error. Without this change we are seeing page poisoning - write after free when running stress tests using iommu-debug test cases. Change-Id: I1033808a510786577c41201c2a6a330e5465d4d1 Acked-by: Ankur Saxena <c_ankusa@qti.qualcomm.com> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
* iommu: iommu-debug: limit memory address exposureLiam Mark2017-05-30
| | | | | | | | | Update pte and dma atos debugfs nodes to be inline with other iommu debugfs nodes and only expose memory addresses when kptr_restrict is disabled. Change-Id: I46d5de498b811b4874be570aea7b41461b9a1a98 Signed-off-by: Liam Mark <lmark@codeaurora.org>
* iommu: iommu-debug: cleanup iommu debugLiam Mark2017-05-30
| | | | | | | | | | Only expose debugfs nodes for test devices. Restrict secure attach to a valid vmid. Add clock reference counting to make code more robust. Restrict address printing with kptr_restrict. Change-Id: Ibf90068d778b0156e3bb42287af5dda3864da5fc Signed-off-by: Liam Mark <lmark@codeaurora.org>
* iommu: iommu-debug: Rework CONFIG_IOMMU_DEBUG_TRACKINGPatrick Daly2017-05-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If CONFIG_IOMMU_DEBUG_TRACKING=y, a deadlock will occur if userspace writes to the debugfs file "attach": -001|context_switch(inline) -001|__schedule() -002|__preempt_count_sub(inline) -002|schedule() -003|schedule_timeout() -004|do_wait_for_common(inline) -004|__wait_for_common(inline) -004|wait_for_common() -005|wait_for_completion() -006|__synchronize_srcu() -007|synchronize_srcu() -008|debugfs_remove_recursive() -009|iommu_debug_detach_device() -010|__iommu_detach_device() -011|__iommu_group_for_each_dev(inline) -011|__iommu_detach_group() -012|iommu_detach_device() -013|iommu_debug_device_profiling() -014|iommu_debug_device_show() -015|seq_read() -016|full_proxy_read() -017|__vfs_read() -018|vfs_read() Since the files in the attachment directory are rarely used, remove them. Update the data saved by this config option to work properly with iommu groups. Change-Id: I3f0f1d0836f37412915ce3e78d8aefe92dc8d096 Signed-off-by: Patrick Daly <pdaly@codeaurora.org> [lmark@codeaurora.org: deadlock is not an issue on this branch but this change is backported because there are security benefits from removing the iommu debugfs attachments nodes, such as removing register access.] Signed-off-by: Liam Mark <lmark@codeaurora.org>
* Merge "iommu/iommu-debug: Add validation support for per-buffer coherent ↵Linux Build Service Account2017-05-03
|\ | | | | | | mappings"
| * iommu/iommu-debug: Add validation support for per-buffer coherent mappingsSudarshan Rajagopalan2017-05-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Added new debugfs files/nodes to perform basic validation of the per-buffer IO coherent dma-mapping that was recently implemented. Also, added a node to print out the PTE for a given IOVA. Nodes added: dma_attach dma_map dma_unmap dma_atos virt_addr pte Change-Id: I041ab5f4e37e50dd3f58e2def3fdd3125a60629c Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
* | Merge remote-tracking branch 'remotes/quic/dev/msm-4.4-8996au' into msm-4.4Zhiqiang Tu2017-05-02
|\ \ | |/ |/| | | | | | | | | | | | | Conflicts: arch/arm/boot/dts/qcom/msm8996-auto-cdp.dtsi drivers/gpu/drm/msm/Makefile Change-Id: Ief80c28ff1422fd71a0c3d2041531e2ab078ee7a Signed-off-by: Zhiqiang Tu <ztu@codeaurora.org>
| * iommu/iommu-debug: Do a software table walk if ATOS failsMitchel Humpherys2017-03-20
| | | | | | | | | | | | | | | | | | | | | | | | It's hard to tell whether ATOS failed due to a misconfiguration in hardware or software. Add a software table walk to help narrow down the reasons for the failure. If the software walk succeeds then there's something wrong in hardware. If the software walk fails then there's something wrong in software. CRs-Fixed: 1014916 Change-Id: I49dd61856ad08e1890791b3e5c180350a5eaa648 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* | iommu: disable smmu stalls on faulty transactionsCharan Teja Reddy2017-04-25
| | | | | | | | | | | | | | | | | | | | | | Disable the SMMU stalls on faulty transactions by terminating it using the CB.SCTLR register. Faulty transaction on a CB causes the back pressure on the QSMMU transaction pipe which inturn affect the other masters using the same SMMU. Pass the DOMAIN_ATTR_CB_STALL_DISABLE flag to iommu_domain_set_attr api in order to use this feature. Change-Id: Ib8fa35854ff24e0295d330c5fb79375f58c3e841 Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
* | iommu: iommu-debug: assign iova space for fastmap clientSudarshan Rajagopalan2017-04-20
|/ | | | | | | | | | With fast mapping, the iova range is zero in the absence of mapping object from the client. In such case, set the iova space using the DOMAIN_ATTR_GEOMETRY dommain attribute. CRs-Fixed: 2020868 Change-Id: I28790728c02ecb2d0a921bf5a218fb8b16662619 Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
* arm: dma-mapping: add dma mapper for io-pgtable-fast for 32 bitCharan Teja Reddy2017-02-13
| | | | | | | | | | io-pgtable-fast was implemented to achieve better performance for IOMMU map/un-map. Add DMA API support that goes through io-pgtable-fast for 32 bit targets. Change-Id:I3d0560a4331f6b7b87c70d0885df11d12cb1d6ec Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
* iommu: pass proper vmid value for secure attachmentsCharan Teja Reddy2017-01-13
| | | | | | | | Pass the proper VMID value during secure attach. This VMID is used by the HYP/TZ to maintain the pagetables. Change-Id: I3b7c27c079b044c9325bcbcb6fa4312e424f3a94 Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
* iommu: iommu-debug: Allow full dma_addr_t sized address for atosPatrick Daly2016-11-23
| | | | | | | | | Iommu addresses are unsigned numbers. Therefore use the unsigned variants of the kstrto*_from_user functions. Change-Id: I9a34d522a8dc7e2efca95b5a1ccb6a7a2e260b42 Reported-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
* iommu/arm-smmu: support mapping before enabling S1 translationsLiam Mark2016-11-11
| | | | | | | | | | | | | | | | | | | | | | | For performance reasons there are clients who would like to move from stage 1 bypass to stage 1 enabled without having to stop their device. Currently clients need to stop their device because they have to create the required stage 1 mappings before re-enabling the device. Add the new DOMAIN_ATTR_EARLY_MAP domain attribute to allow clients to create stage 1 mappings after attaching but before enabling stage 1 translations. If the clients set the DOMAIN_ATTR_EARLY_MAP domain attribute to 1 before attaching then then once they attach the SMMU driver won't enable stage 1 translations. This gives the client the opportunity to create the required early mappings (for example using iommu_map). When the client has finished creating the necessary early mappings the client can then set the DOMAIN_ATTR_EARLY_MAP domain attribute to 0, this will in turn enable stage 1 translations. Change-Id: I9e95c5d2130f1d371e201eac69dec140cc773b1f Signed-off-by: Liam Mark <lmark@codeaurora.org>
* iommu/iommu-debug: Remove obsolete IOMMU domain attributeMitchel Humpherys2016-09-26
| | | | | | | | | The DOMAIN_ATTR_COHERENT_HTW_DISABLE IOMMU domain attribute is being removed. SMMU coherency will be configured through the SMMU device tree nodes moving forward. Remove the obsolete option. Change-Id: If1251c945d71f8a7ab7c8e62c8a3d9d9139495ab Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Make debug driver 32 bit compatibleSusheel Khiani2016-07-21
| | | | | | | | | | | Currently iommu-debug was enable only for 64 bit targets as there were compilation issues coming up while enabling it for 32 bit. Fix these issues to ensure that we can use it on 32 bit targets too. Change-Id: If230af86f2fdd12fb5396f3b4736e57a123422bd Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>
* iommu/iommu-debug:: initialize variables before useShiraz Hashim2016-07-11
| | | | | | | | Initialize return values to their default before being used. Change-Id: Ie4dd908657573e5110bce65931d5507125da4c40 Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>
* iommu/iommu-debug: Add debugfs file to enable config clocksMitchel Humpherys2016-05-20
| | | | | | | | | | It's fairly common while debugging to need to enable the config clocks for an SMMU so that you can poke around at the registers. Add a debugfs file to do this. CRs-Fixed: 997751 Change-Id: I31b90d64c2facb0a681f9da586e2c90803776819 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add functional test for ARM DMA IOMMU mapperMitchel Humpherys2016-05-20
| | | | | | | | | | | | The vanilla ARM DMA IOMMU mapper is used by many clients in our system, but we have no functional test coverage of it. Add some functional testing for it by leveraging the tests that were recently added for the Fast DMA mapper. Since the Fast mapper and the ARM mapper are both DMA API implementations we can share most of the code. CRs-Fixed: 997751 Change-Id: I58734a82f4dc3e4658ab7995b6682205097da991 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add functional tests for fast mapperMitchel Humpherys2016-05-20
| | | | | | | | Functional tests are good. Add some for the fast DMA mapper. CRs-Fixed: 997751 Change-Id: Iefb80124c335d65ea5bd8a15406c685125030003 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add file for profiling the fast DMA APIsMitchel Humpherys2016-05-20
| | | | | | | | | | The fast DMA API implementation that was recently needs to be profiled. Add a new debugfs file (similar to the original "profiling" file) to do this. CRs-Fixed: 997751 Change-Id: I1236d9b6aaeab9d34b39e7f5d7b285691d1779da Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add file for profiling fast mapperMitchel Humpherys2016-05-20
| | | | | | | | | | We'd like to understand the performance of the fast page table mapper, which only supports 4K page sizes. Add a debugfs file to profile the new mapper. CRs-Fixed: 997751 Change-Id: I5adc3c3ecd432552386b600b9e66e3db42e73138 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Maintain list of domains during allocSusheel Khiani2016-05-18
| | | | | | | | | | | | | | | | | Current list of domains in iommu-debug was only maintained during attach/detach calls. But for masters like graphics this won't account for all the domains, as it allocates multiple different domains but attaches only one domain at a time. Add support for maintaining list of unattached domains too by adding them to debug_attachments list during domain alloc but keeping dev as NULL. We would add entry in debugfs attachment directory only on actual attach call. Change-Id: Ifde043e5c39f356b4187a30cbdf020ee943618f1 Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>
* iommu/iommu-debug: Add dummy driver for standalone testingMitchel Humpherys2016-05-03
| | | | | | | | | | | | | | | | | | | | | | The IOMMU test framework relies on the `iommus' property, and we currently rely on these methods for making that happen: (1) Clients enabling their DT nodes. (2) We put an `iommus' property in our IOMMU DT nodes themselves. The problem with (1) is that clients aren't always ready during early chip validation. The problem with (2) is that it results in us recursively mapping into the SMMU when we try to do cache maintenance on our page table memory. Fix these problems by introducing a dummy driver with associated device tree bindings that will do absolutely nothing other than wait for the SMMU driver and IOMMU test framework to slurp it up. CRs-Fixed: 1003233 Change-Id: I6a5802aff5bab99d29c6ed9d953a203cbd8015bb Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* drivers: iommu, leds, input, clk, devfreq: fix warningsRohit Vaswani2016-03-23
| | | | | | | | Fix some variable initializations which would otherwise cause forbidden warnings. Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org> Signed-off-by: David Keitel <dkeitel@codeaurora.org>
* iommu-debug: Add proper header file for module_init()Patrick Daly2016-03-22
| | | | | | | Fix compilation on 4.4 kernel. Change-Id: I760e9adb94c15263e4bf653aec2e3c63e368c2bc Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
* iommu/iommu-debug: Add 3 more signifigant digitsPatrick Daly2016-03-22
| | | | | | | | | | | Print time with ns precision. Ex: size iommu_map iommu_unmap 4K 43.021 us 99.479 us Change-Id: Ib7f3db2be533c77adf0a20de557615a0e2433dd9 Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
* iommu/iommu-debug: Improve statistics collectionPatrick Daly2016-03-22
| | | | | | | | | Add a nr_iters file which specifies the number of runs to average performance over. Alternatively, setting this to 1 allows the user to collect raw data. Change-Id: Ifab7215027b597fb2650ab2f0c5065bebe0b8c5d Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
* iommu/iommu-debug: Use more iterations while profilingMitchel Humpherys2016-03-22
| | | | | | | | | Currently we only take one sample per buffer size per API when doing profiling. This results in high run-to-run variance in the results. Use more iterations to help smooth this out. Change-Id: I3779007a2f69ef79b573285b2422554f42dda99f Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add support for secure domain profilingMitchel Humpherys2016-03-22
| | | | | | | | | | Secure domains do different amounts of work than non-secure domains, so we need to be able to profile them separately. Add another debugfs file, "secure_profiling", that does the same thing as the "profiling" file. Change-Id: I6968036bfdcc63449f27336771b3956a2b7754f6 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Only uniquify directory names for dynamic domainsMitchel Humpherys2016-03-22
| | | | | | | | | | | | The subdirectories under "attach" currently get a UUID appended to their name to ensure that there won't be any collisions when multiple domains are attached to the same device. This is only needed for dynamic domains since those are the only types of domains that can be attached to the same device concurrently. Only do the uniquification for dynamic domains since the resulting directory name is a bit messy with the UUID. Change-Id: Ia86b192e5b9d6a63132228fa86549a2977ec74a4 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Set DOMAIN_ATTR_ATOMIC during profilingMitchel Humpherys2016-03-22
| | | | | | | | | | | There's some non-deterministic latency incurred by enabling clocks and regulators. Clocks and regulators are left on for atomic domains, which makes them a good choice for profiling the page table management code. Use an atomic domain for map/unmap profiling to make things more deterministic. Change-Id: Ib9fa48699c9d6009dd3f3b322002e2fb0f2ff99c Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Provide debugfs for iommu_reg_{read,write}Mitchel Humpherys2016-03-22
| | | | | | | | | It can be useful to read and modify SMMU settings interactively. Add a debugfs interface for the recently added iommu_reg_read and iommu_reg_write functions for this purpose. Change-Id: If3c9bf1833dc950c7ca1e2ce1a373bcaa31ebcf0 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Pass a flags value to iommu_trigger_faultMitchel Humpherys2016-03-22
| | | | | | | | | iommu_trigger_fault now accepts a flags argument which can be handled by the individual IOMMU drivers. Take the value written to the debugfs file by the user and pass it as the flags value. Change-Id: I803e6585aea35fbb0f6e03e4279587b36a7bad92 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu: Add flags parameter to .trigger_faultMitchel Humpherys2016-03-22
| | | | | | | | | | IOMMU drivers might want more control over the types of faults being triggered with iommu_trigger_fault. Add a flags parameter that can be used to provide more control over the types of faults that can be triggered. Change-Id: I2f21b383437430e957ab52070d3575e8cb3dee90 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu: debug: add support for MSM iommu devicesChintan Pandya2016-03-22
| | | | | | | | | MSM iommu devices' DT bindings defer from upstream way. And hence, the debug driver doesn't support to profile MSM iommu devices. Add that support. Change-Id: I507d500785408b1d96f017648475933ee408b664 Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
* iommu/iommu-debug: Add secure_attach debugfs fileMitchel Humpherys2016-03-22
| | | | | | | | | | | | | | | | | It can be useful to perform tests on secure domains. Add support for this with a "secure_attach" file that will also set the DOMAIN_ATTR_SECURE_VMID to the value written to the file. Example usage: # cd /sys/kernel/debug/iommu/tests/<device> # echo 0xA > secure_attach # echo 0x1000,0x1000,0x1000,1 > map # echo 0x1000,0x1000 > unmap # echo 0 > secure_attach Change-Id: I0181e360f3e98e0e47a3af8c6adb71c9c4a3c9b5 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Show secure VMID in attach infoMitchel Humpherys2016-03-22
| | | | | | | | It can be useful to know a domain's secure VMID value. Add this information to the attach info debugfs file. Change-Id: Ic8a73000b8337639f95376b13ef58a0e2a089dde Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Fix parsing of unmap sizeMitchel Humpherys2016-03-22
| | | | | | | | | The unmap debugfs file write handler is currently incorrectly parsing the size to be unmapped (storing the IOVA as the size). Fix this by parsing from the correct offset (just after the first comma). Change-Id: I438851882052acc511c713706bc4f0cbf373353e Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu: Create iommu debugfs directory from IOMMU codeMitchel Humpherys2016-03-22
| | | | | | | | | Currently we're creating an "iommu" debugfs directory from the iommu-debug code. Other IOMMU modules might want to make use of this same directory, so create it from the IOMMU framework code itself. Change-Id: I679fdfc34ba5fcbd927dc5981438c6fabcfa3639 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Don't add debugfs entries until we initMitchel Humpherys2016-03-22
| | | | | | | | | | | | | | | The attachment tracking code adds a node to debugfs every time a client attaches a domain to an IOMMU device. The problem is that clients can start making those attachments during early boot, before iommu-debug initializes (including setting up the root debugfs directory for the attachment tracking), which means they get stuck in the root debugfs directory. Trying to initialize iommu-debug earlier than all possible IOMMU clients is tricky, so fix this by only installing debugfs entries onces we've initialized, installing debugfs entries for any early attachments at initialization time. Change-Id: I8364015346105187e0c8f787fc2b4155d72b3584 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add debugfs file to trigger context faultsMitchel Humpherys2016-03-22
| | | | | | | | It can be useful during development to trigger faults. Add a debugfs file to do so. Change-Id: Ic7b304ef0d908ebd506979f0c87189e34d7dfc67 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add COHERENT_HTW_DISABLE to attach infoMitchel Humpherys2016-03-22
| | | | | | | | | It can be useful to check whether or not coherent hardware table walking has been explicitly disabled on attached domains. Add this to the attach info debugfs file. Change-Id: I432303ecb734d32eaa02038694daad0d8c4d8aba Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Move attachment info file to subdirectoryMitchel Humpherys2016-03-22
| | | | | | | | | | | | Currently IOMMU attachment info is available in debugfs files located at <debugfs_root>/iommu/attachments/<attached_device>. However, there are more actions that can be taken on attached devices besides just printing their info. Make room for more debugfs files for attached devices by creating a directory for each one, and move the existing info file to: <debugfs_root>/iommu/attachments/<attached_device>/info. Change-Id: Ia56efc3aeb5e82afc34314fe48aaa0cd6e5579be Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Initialize debug device to 0Mitchel Humpherys2016-03-22
| | | | | | | | | | | | | | | | | | | | | | | Currently the debug device structure is allocated with kmalloc, without initializing all of the fields in the structure. Later, those fields might be uses before they've every been assigned. For example, if a user executes the following code on a fresh boot: # cd /sys/kernel/debug/iommu/tests/some_device # echo 0 > attach The kernel crashes with something like this (assuming page poisoning is enabled): Unable to handle kernel paging request at virtual address aaaaaaaaaaaaaaaa pgd = ffffffc0a92a1000 [aaaaaaaaaaaaaaaa] *pgd=0000000000000000, *pud=0000000000000000 Fix this by initializing all the fields in the structure to 0 by using kzalloc instead of kmalloc. Change-Id: I3514bf7bf174e176ff7a310c7134d0f53e22d771 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
* iommu/iommu-debug: Add translation and mapping test filesMitchel Humpherys2016-03-22
| | | | | | | | | | | | | | | | | | | | | | Running ATOS commands on custom mappings is a useful tool for debugging. Add a new debugfs file for interactively attaching, detaching, mapping, unmapping, and issuing ATOS commands. Example usage: # cd /sys/kernel/debug/iommu/tests/soc:qcom,msm-audio-ion # echo 1 > attach # echo 0x1000,0x5000,0x1000,1 > map # echo 0x1008 > atos # cat atos 0x5008 # echo 0x2000 > atos # cat atos FAIL # echo 0 > attach Change-Id: I596cd3f05fcb59653e2acddc17d175855a1eb9a1 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-22 23:18:33 +0000