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* iommu/exynos: Fix error handling for of_platform_device_createAmitoj Kaur Chawla2016-08-091-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | of_platform_device_create returns NULL on error so an IS_ERR test is incorrect here and a NULL check is required. The Coccinelle semantic patch used to make this change is as follows: @@ expression e; @@ e = of_platform_device_create(...); if( - IS_ERR(e) + !e ) { <+... return - PTR_ERR(e) + -ENODEV ; ...+> } Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: update to use iommu big-endianBen Dooks2016-06-211-1/+5
| | | | | | | | | | Add initial support for big endian by always writing the pte in le32. Note, revisit if hardware capable of doing big endian fetches. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Prepare for deferred probe supportMarek Szyprowski2016-06-151-1/+4
| | | | | | | | | Register iommu_ops at the end of successful probe instead of doing that unconditionally. This makes Exynos IOMMU driver ready for deferred probe caused by not-yet-available clocks. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Prepare clocks when needed, not in driver probeMarek Szyprowski2016-06-151-28/+26
| | | | | | | | | | | Make clock preparation together with clk_enable(). This way inactive SYSMMU controllers will not keep clocks prepared all the time. This change allows more fine graded power management in the future. All the code assumes that clock management doesn't fail, so guard clock_prepare_enable() it with BUG_ON(). Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Fix master clock management for inactive SYSMMUMarek Szyprowski2016-06-151-5/+4
| | | | | | | | | If SYSMMU controller is not active, there is no point in enabling master's clock just for doing the the of internal state. This patch moves enabling that clock to the block which actually does the register access. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Return proper errors from getting clocksMarek Szyprowski2016-06-151-32/+24
| | | | | | | | | This patch reworks driver probe code to propagate error codes from clk_get() operation. This will allow to properly handle deferred probe in the future. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Suppress unbinding to prevent system failureMarek Szyprowski2016-06-151-0/+1
| | | | | | | | | | | | | Removal of IOMMU driver cannot be done reliably, so Exynos IOMMU driver doesn't support this operation. It is essential for system operation, so it makes sense to prevent unbinding by disabling bind/unbind sysfs feature for SYSMMU controller driver to avoid kernel ops or trashing memory caused by such operation. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> CC: stable@vger.kernel.org # v4.2+ Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Use proper readl/writel register interfaceMarek Szyprowski2016-02-291-19/+19
| | | | | | | | | | Drivers should use generic readl/writel calls to access HW registers, so replace all __raw_readl/writel with generic version. Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Pointers are nto physical addressesArnd Bergmann2016-02-291-1/+1
| | | | | | | | | | | | | | | | | | The exynos iommu driver changed an incorrect cast from pointer to 'unsigned int' to an equally incorrect cast to a 'phys_addr_t', which results in an obvious compile-time error when phys_addr_t is wider than pointers are: drivers/iommu/exynos-iommu.c: In function 'alloc_lv2entry': drivers/iommu/exynos-iommu.c:918:32: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast] The code does not actually want the physical address (which would involve using virt_to_phys()), but just checks the alignment, so we can change it to use a cast to uintptr_t instead. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 740a01eee9ad ("iommu/exynos: Add support for v5 SYSMMU") Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Support multiple attach_device callsMarek Szyprowski2016-02-251-32/+40
| | | | | | | | IOMMU core calls attach_device callback without detaching device from the previous domain. This patch adds support for such unballanced calls. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add support for v5 SYSMMUMarek Szyprowski2016-02-251-48/+139
| | | | | | | | | | | This patch adds support for v5 of SYSMMU controller, found in Samsung Exynos 5433 SoCs. The main difference of v5 is support for 36-bit physical address space and some changes in register layout and core clocks hanging. This patch also adds support for ARM64 architecture, which is used by Exynos 5433 SoCs. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add support for SYSMMU controller with bogus version regMarek Szyprowski2016-02-251-1/+23
| | | | | | | | | SYSMMU on some SoCs reports bogus values in VERSION register. Force hardware version to 1.0 for such controllers. This patch also moves reading version register to driver's probe() function. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Unify code for fldp cache invalidationMarek Szyprowski2016-02-251-9/+4
| | | | | | | This patch simplifies the code for handling of flpdcache invalidation. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Refactor init config codeMarek Szyprowski2016-02-251-16/+9
| | | | | | | | This patch rewrites sysmmu_init_config function to make it easier to read and understand. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Refactor fault handling codeMarek Szyprowski2016-02-251-68/+41
| | | | | | | | | This patch provides a new implementation for page fault handing code. The new implementation is ready for future extensions. No functional changes have been made. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Refactor code (no direct register access)Marek Szyprowski2016-02-251-21/+19
| | | | | | | | | This patch changes some internal functions to have access to the state of sysmmu device instead of having only it's registers. This will make the code ready for future extensions. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Simplify master clock operationsMarek Szyprowski2016-02-251-20/+12
| | | | | | | | All clock API function can be called on NULL clock, so simplify code avoid checking of master clock presence. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Remove ARM-specific cache flush interfaceMarek Szyprowski2016-02-251-25/+49
| | | | | | | | | | | | | This patch replaces custom ARM-specific code for performing CPU cache flush operations with generic code based on DMA-mapping. Domain managing code is independent of particular SYSMMU device, so the first registered SYSMMU device is used for DMA-mapping calls. This simplification works fine because all SYSMMU controllers are in the same address space (where DMA address equals physical address) and the DMA-mapping calls are done mainly to flush CPU cache to make changes visible to SYSMMU controllers. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add support for IOMMU_DOMAIN_DMA domain typeMarek Szyprowski2016-02-251-4/+15
| | | | | | | | This patch adds support for DMA domain type. Such domain have DMA cookie prepared and can be used by generic DMA-IOMMU glue layer. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Rework iommu group initializationMarek Szyprowski2016-02-251-11/+16
| | | | | | | | This patch replaces custom code in add_device implementation with iommu_group_get_for_dev() call and provides the needed callback. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add callback for initializing devices from device treeMarek Szyprowski2015-05-291-0/+28
| | | | | | | | | | This patch adds implementation of of_xlate callback, which prepares masters device for attaching to IOMMU. This callback is called during creating devices from device tree. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Init from dt-specific callback instead of initcallMarek Szyprowski2015-05-291-9/+28
| | | | | | | | | | | This patch introduces IOMMU_OF_DECLARE-based initialization to the driver, which replaces subsys_initcall-based procedure. exynos_iommu_of_setup ensures that each sysmmu controller is probed before its master device. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add system suspend/resume supportMarek Szyprowski2015-05-291-0/+31
| | | | | | | | | | | When system goes into suspend state, iommu should save it's state and restore after system resume. This is handled by 'late' pm ops to ensure that sysmmu will be suspended after its master devices and restored before them. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add support for runtime_pmMarek Szyprowski2015-05-291-0/+2
| | | | | | | | | This patch fixes support for runtime power management for SYSMMU controllers, so they are enabled when master device is attached. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add support for binding more than one sysmmu to master deviceMarek Szyprowski2015-05-291-6/+5
| | | | | | | | | | | This patch adds support for assigning more than one SYSMMU controller to the master device. This has been achieved simply by chaning the struct device pointer in struct exynos_iommu_owner into the list of struct sysmmu_drvdata of all controllers assigned to the given master device. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add/remove callbacks should fail if no iommu is availableMarek Szyprowski2015-05-291-0/+6
| | | | | | | | | Return fail if given master device passed to add_device/remove_device callbacks doesn't has associated any sysmmu controller. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Document internal structuresMarek Szyprowski2015-05-291-18/+35
| | | | | | | | Add a few words of comment to all internal structures used by the driver. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Remove excessive includes and sort others alphabeticallyMarek Szyprowski2015-05-291-9/+5
| | | | | | | | | Removed following unused includes: <linux/mm.h>, <linux/errno.h>, <linux/memblock.h> and <linux/export.h>. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Use struct exynos_iommu_domain in internal structuresMarek Szyprowski2015-05-291-5/+5
| | | | | | | | | Replace all remaining usage of struct iommu_domain with struct exynos_iommu_domain in all internal structures and functions. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Rename variables to reflect their purposeMarek Szyprowski2015-05-291-93/+94
| | | | | | | | | | This patch renames some variables to make the code easier to understand. 'domain' is replaced by 'iommu_domain' (more generic entity) and really meaningless 'priv' by 'domain' to reflect its purpose. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Refactor function parameters to simplify codeMarek Szyprowski2015-05-291-86/+48
| | | | | | | | | | | | | | | This patch simplifies the code by: - refactoring function parameters from struct device pointer to direct pointer to struct sysmmu drvdata - moving list_head enteries from struct exynos_iommu_owner directly to struct sysmmu_drvdata After above refactoring some functions were never used, so remove also them completely. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Remove useless members from exynos_iommu_owner structureMarek Szyprowski2015-05-291-19/+2
| | | | | | | | | | | This patch removes useless spinlocks and other unused members from struct exynos_iommu_owner. There is no point is protecting this structure by spinlock because content of this structure doesn't change and other structures have their own spinlocks. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Remove unused functionsMarek Szyprowski2015-05-291-31/+0
| | | | | | | | | This patch removes two unneeded functions, which are not a part of generic IOMMU API and were never used by any other driver. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Don't read version register on every tlb operationMarek Szyprowski2015-05-291-8/+5
| | | | | | | | | This patch removes reading of REG_MMU_VERSION register on every tlb operation and caches SYSMMU version in driver's internal data. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Tell kmemleak to ignore 2nd level page tablesColin Cross2015-05-111-0/+1
| | | | | | | | | | | The pointers to the 2nd level page tables are converted to 1st level page table entries, which means kmemleak can't find them and assumes they have been leaked. Call kmemleak_ignore on the 2nd level page tables to prevent them from showing up in kmemleak reports. Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Dmitry Torokhov <dtor@chromium.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Make use of domain_alloc and domain_freeJoerg Roedel2015-03-311-40/+47
| | | | | | | Implement domain_alloc and domain_free iommu-ops as a replacement for domain_init/domain_destroy. Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Play nice in multi-platform buildsThierry Reding2015-02-251-0/+7
| | | | | | | | | | | | | | | | | | | | | The Exynos System MMU driver unconditionally executes code and registers a struct iommu_ops with the platform bus irrespective of whether it runs on an Exynos SoC or not. This causes problems in multi-platform kernels where drivers for other SoCs will no longer be able to register their own struct iommu_ops or even try to use a struct iommu_ops for an IOMMU that obviously isn't there. The smallest fix I could think of is to check for the existence of any Exynos System MMU devices in the device tree and skip initialization otherwise. This fixes a problem on Tegra20 where the DRM driver will try to use the obviously non-existent Exynos System MMU. Reported-by: Nicolas Chauvet <kwizart@gmail.com> Cc: Kukjin Kim <kgene@kernel.org> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* Merge tag 'driver-core-3.19-rc1' of ↵Linus Torvalds2014-12-151-1/+0
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev_<level>_once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...
| * iommu: drop owner assignment from platform_driversWolfram Sang2014-10-201-1/+0
| | | | | | | | | | | | | | A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
* | iommu: Add iommu_map_sg() functionOlav Haugan2014-11-041-0/+1
|/ | | | | | | | | | | | | | | | | | | Mapping and unmapping are more often than not in the critical path. map_sg allows IOMMU driver implementations to optimize the process of mapping buffers into the IOMMU page tables. Instead of mapping a buffer one page at a time and requiring potentially expensive TLB operations for each page, this function allows the driver to map all pages in one go and defer TLB maintenance until after all pages have been mapped. Additionally, the mapping operation would be faster in general since clients does not have to keep calling map API over and over again for each physically contiguous chunk of memory that needs to be mapped to a virtually contiguous region. Signed-off-by: Olav Haugan <ohaugan@codeaurora.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Fix trivial typosSachin Kamat2014-08-191-25/+26
| | | | | | | | | Fixed trivial typos and grammar to improve readability. Changed w/a to workaround. Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu: Constify struct iommu_opsThierry Reding2014-07-071-1/+1
| | | | | | | | This structure is read-only data and should never be modified. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Fix checkpatch warningSachin Kamat2014-05-261-0/+3
| | | | | | | | Silences the following type of warnings: WARNING: Missing a blank line after declarations Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Remove unnecessary "&" from function pointersBjorn Helgaas2014-05-141-9/+9
| | | | | | | | Remove unnecessary "&" from function pointers in exynos_iommu_ops. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Apply workaround of caching fault page table entriesCho KyongHo2014-05-131-17/+146
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch contains 2 workaround for the System MMU v3.x. System MMU v3.2 and v3.3 has FLPD cache that caches first level page table entries to reduce page table walking latency. However, the FLPD cache is filled with a first level page table entry even though it is not accessed by a master H/W because System MMU v3.3 speculatively prefetches page table entries that may be accessed in the near future by the master H/W. The prefetched FLPD cache entries are not invalidated by iommu_unmap() because iommu_unmap() only unmaps and invalidates the page table entries that is mapped. Because exynos-iommu driver discards a second level page table when it needs to be replaced with another second level page table or a first level page table entry with 1MB mapping, It is required to invalidate FLPD cache that may contain the first level page table entry that points to the second level page table. Another workaround of System MMU v3.3 is initializing the first level page table entries with the second level page table which is filled with all zeros. This prevents System MMU prefetches 'fault' first level page table entry which may lead page fault on access to 16MiB wide. System MMU 3.x fetches consecutive page table entries by a page table walking to maximize bus utilization and to minimize TLB miss panelty. Unfortunately, functional problem is raised with the fetching behavior because it fetches 'fault' page table entries that specifies no translation information and that a valid translation information will be written to in the near future. The logic in the System MMU generates page fault with the cached fault entries that is no longer coherent with the page table which is updated. There is another workaround that must be implemented by I/O virtual memory manager: any two consecutive I/O virtual memory area must have a hole between the two that is larger than or equal to 128KiB. Also, next I/O virtual memory area must be started from the next 128KiB boundary. 0 128K 256K 384K 512K |-------------|---------------|-----------------|----------------| |area1---------------->|.........hole...........|<--- area2 ----- The constraint is depicted above. The size is selected by the calculation followed: - System MMU can fetch consecutive 64 page table entries at once 64 * 4KiB = 256KiB. This is the size between 128K ~ 384K of the above picture. This style of fetching is 'block fetch'. It fetches the page table entries predefined consecutive page table entries including the entry that is the reason of the page table walking. - System MMU can prefetch upto consecutive 32 page table entries. This is the size between 256K ~ 384K. Signed-off-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Turn on useful configuration optionsCho KyongHo2014-05-131-4/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This turns on FLPD_CACHE, ACGEN and SYSSEL. FLPD_CACHE is a cache of 1st level page table entries that contains the address of a 2nd level page table to reduce latency of page table walking. ACGEN is architectural clock gating that gates clocks by System MMU itself if it is not active. Note that ACGEN is different from clock gating by the CPU. ACGEN just gates clocks to the internal logic of System MMU while clock gating by the CPU gates clocks to the System MMU. SYSSEL selects System MMU version in some Exynos SoCs. Some Exynos SoCs have an option to select System MMU versions exclusively because the SoCs adopts new System MMU version experimentally. This also always selects LRU as TLB replacement policy. Selecting TLB replacement policy is deprecated from System MMU 3.2. TLB in System MMU 3.3 has single TLB replacement policy, LRU. The bit of MMU_CFG selecting TLB replacement policy is remained as reserved. QoS value of page table walking is set to 15 (highst value). System MMU 3.3 can inherit QoS value of page table walking from its master H/W's transaction. This new feature is enabled by default and QoS value written to MMU_CFG is ignored. This patch also adds simplifies the sysmmu version checking by introducing some macros. Signed-off-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Support for device treeCho KyongHo2014-05-131-125/+158
| | | | | | | | | | | | This commit adds device tree support for System MMU. Also, system mmu handling is improved. Previously, an IOMMU domain is bound to a System MMU which is not correct. This patch binds an IOMMU domain with the master device of a System MMU. Signed-off-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Enhanced error messagesCho KyongHo2014-05-131-14/+9
| | | | | | | | | Some redundant error message is removed and some error messages are changed to error level from debug level. Signed-off-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Add devices attached to the System MMU to an IOMMU groupAntonios Motakis2014-05-131-0/+28
| | | | | | | | | | | | | Patch written by Antonios Motakis <a.motakis@virtualopensystems.com>: IOMMU groups are expected by certain users of the IOMMU API, e.g. VFIO. Since each device is behind its own System MMU, we can allocate a new IOMMU group for each device. Reviewed-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com> Signed-off-by: Shaik Ameeer Basha <shaik.ameer@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* iommu/exynos: Use exynos-iommu specific typedefCho KyongHo2014-05-131-42/+59
| | | | | | | | | | | | This commit introduces sysmmu_pte_t for page table entries and sysmmu_iova_t vor I/O virtual address that is manipulated by exynos-iommu driver. The purpose of the typedef is to remove dependencies to the driver code from the change of CPU architecture from 32 bit to 64 bit. Signed-off-by: Cho KyongHo <pullip.cho@samsung.com> Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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