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* Merge branch 'for-rmk' of ↵Russell King2011-12-081-15/+24
|\ | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux into devel-stable Conflicts: arch/arm/mm/ioremap.c
| * ARM: LPAE: Page table maintenance for the 3-level formatCatalin Marinas2011-12-081-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch modifies the pgd/pmd/pte manipulation functions to support the 3-level page table format. Since there is no need for an 'ext' argument to cpu_set_pte_ext(), this patch conditionally defines a different prototype for this function when CONFIG_ARM_LPAE. The patch also introduces the L_PGD_SWAPPER flag to mark pgd entries pointing to pmd tables pre-allocated in the swapper_pg_dir and avoid trying to free them at run-time. This flag is 0 with the classic page table format. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| * ARM: pgtable: Fix compiler warning in ioremap.c introduced by nopudCatalin Marinas2011-12-081-12/+19
| | | | | | | | | | | | | | | | | | | | | | | | With the arch/arm code conversion to pgtable-nopud.h, the section and supersection (un|re)map code triggers compiler warnings on UP systems. This is caused by pmd_offset() being given a pgd_t argument rather than a pud_t one. This patch makes the necessary conversion with the assumption that the pud is folded into the pgd. The page table setting code only loops over the pmd which is enough with the classic page tables. This code is not compiled when LPAE is enabled. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
* | ARM: add generic ioremap optimization by reusing static mappingsNicolas Pitre2011-11-271-24/+48
| | | | | | | | | | | | | | | | | | | | | | | | Now that we have all the static mappings from iotable_init() located in the vmalloc area, it is trivial to optimize ioremap by reusing those static mappings when the requested physical area fits in one of them, and so in a generic way for all platforms. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Stephen Warren <swarren@nvidia.com> Tested-by: Kevin Hilman <khilman@ti.com> Tested-by: Jamie Iles <jamie@jamieiles.com>
* | ARM: simplify __iounmap() when dealing with section based mappingNicolas Pitre2011-11-271-11/+9Star
|/ | | | | | | | | | | | | | Firstly, there is no need to have a double pointer here as we're only walking the vmlist and not modifying it. Secondly, for the same reason, we don't need a write lock but only a read lock here, since the lock only protects the coherency of the list nothing else. Lastly, the reason for holding a lock is not what the comment says, so let's remove that misleading piece of information. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
* ARM: 7129/1: Add __arm_ioremap_exec for mapping external memory as MT_MEMORYTony Lindgren2011-10-221-0/+21
| | | | | | | | | | | | | This allows mapping external memory such as SRAM for use. This is needed for some small chunks of code, such as reprogramming SDRAM memory source clocks that can't be executed in SDRAM. Other use cases include some PM related code. Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Acked-by: Andres Salomon <dilinger@queued.net> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* Revert "ARM: relax ioremap prohibition (309caa9) for -final and -stable"Russell King2010-12-241-6/+2Star
| | | | This reverts commit 06c1088, as promised in the warning message.
* ARM: relax ioremap prohibition (309caa9) for -final and -stableRussell King2010-10-131-2/+6
| | | | | | | ... but produce a big warning about the problem as encouragement for people to fix their drivers. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: use generic ioremap_page_range()Russell King2010-07-271-70/+4Star
| | | | | | | We don't need our own implementation of this, use the generic library implementation instead. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: Prohibit ioremap() on kernel managed RAMRussell King2010-06-211-0/+6
| | | | | | | | | | | | | | | | | | | | ARMv6 and above have a restriction whereby aliasing virtual:physical mappings must not have differing memory type and sharability attributes. Strictly, this covers the memory type (strongly ordered, device, memory), cache attributes (uncached, write combine, write through, write back read alloc, write back write alloc) and the shared bit. However, using ioremap() and its variants on system RAM results in mappings which differ in these attributes from the main system RAM mapping. Other architectures which similar restrictions approch this problem in the same way - they do not permit ioremap on main system RAM. Make ARM behave in the same way, with a WARN_ON() such that users can be traced and an alternative approach found. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: Add caller information to ioremapRussell King2010-02-151-23/+34
| | | | | | | | | This allows the procfs vmallocinfo file to show who created the ioremap regions. Note: __builtin_return_address(0) doesn't do what's expected if its used in an inline function, so we leave __arm_ioremap callers in such places alone. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* omap iommu: simple virtual address space managementHiroshi DOYU2009-05-191-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch provides a device drivers, which has a omap iommu, with address mapping APIs between device virtual address(iommu), physical address and MPU virtual address. There are 4 possible patterns for iommu virtual address(iova/da) mapping. |iova/ mapping iommu_ page | da pa va (d)-(p)-(v) function type --------------------------------------------------------------------------- 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s 3 | c d c 1 - n - 1 _vmap() / _vunmap() s 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n* 'iova': device iommu virtual address 'da': alias of 'iova' 'pa': physical address 'va': mpu virtual address 'c': contiguous memory area 'd': dicontiguous memory area 'a': anonymous memory allocation '()': optional feature 'n': a normal page(4KB) size is used. 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used. '*': not yet, but feasible. Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
* [ARM] fix section-based ioremapRussell King2009-01-251-9/+2Star
| | | | | | | | | | | | | | | | | | | | | | | Tomi Valkeinen reports: Running with latest linux-omap kernel on OMAP3 SDP board, I have problem with iounmap(). It looks like iounmap() does not properly free large areas. Below is a test which fails for me in 6-7 loops. for (i = 0; i < 200; ++i) { vaddr = ioremap(paddr, size); if (!vaddr) { printk("couldn't ioremap\n"); break; } iounmap(vaddr); } The changes to vmalloc.c weren't reflected in the ARM ioremap implementation. Turns out the fix is rather simple. Tested-by: Tomi Valkeinen <tomi.valkeinen@nokia.com> Tested-by: Matt Gerassimoff <mgeras@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* Merge branch 'ptebits' into develRussell King2008-10-091-2/+1Star
|\ | | | | | | | | | | Conflicts: arch/arm/Kconfig
| * [ARM] remove 'prot_pte_ext' from memory type tableRussell King2008-10-011-2/+1Star
| | | | | | | | | | | | | | This member is now redundant; the memory type is encoded in the Linux PTE bits. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | [ARM] Convert asm/io.h to linux/io.hRussell King2008-09-061-1/+1
| | | | | | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | [ARM] sparse: fix several warningsRussell King2008-09-051-5/+4Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | arch/arm/kernel/process.c:270:6: warning: symbol 'show_fpregs' was not declared. Should it be static? This function isn't used, so can be removed. arch/arm/kernel/setup.c:532:9: warning: symbol 'len' shadows an earlier one arch/arm/kernel/setup.c:524:6: originally declared here A function containing two 'len's. arch/arm/mm/fault-armv.c:188:13: warning: symbol 'check_writebuffer_bugs' was not declared. Should it be static? arch/arm/mm/mmap.c:122:5: warning: symbol 'valid_phys_addr_range' was not declared. Should it be static? arch/arm/mm/mmap.c:137:5: warning: symbol 'valid_mmap_phys_addr_range' was not declared. Should it be static? Missing includes. arch/arm/kernel/traps.c:71:77: warning: Using plain integer as NULL pointer arch/arm/mm/ioremap.c:355:46: error: incompatible types in comparison expression (different address spaces) Sillies. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | [ARM] cputype: separate definitions, use themRussell King2008-09-011-0/+1
|/ | | | | | | | Add asm/cputype.h, moving functions and definitions from asm/system.h there. Convert all users of 'processor_id' to the more efficient read_cpuid_id() function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] move include/asm-arm to arch/arm/include/asmRussell King2008-08-021-1/+1
| | | | | | | Move platform independent header files to arch/arm/include/asm, leaving those in asm/arch* and asm/plat* alone. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* add mm argument to pte/pmd/pud/pgd_freeBenjamin Herrenschmidt2008-02-051-1/+1
| | | | | | | | | | | | | | | | | | (with Martin Schwidefsky <schwidefsky@de.ibm.com>) The pgd/pud/pmd/pte page table allocation functions get a mm_struct pointer as first argument. The free functions do not get the mm_struct argument. This is 1) asymmetrical and 2) to do mm related page table allocations the mm argument is needed on the free function as well. [kamalesh@linux.vnet.ibm.com: i386 fix] [akpm@linux-foundation.org: coding-syle fixes] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [ARM] Fix bounding error in ioremap_pfn()Russell King2007-07-121-6/+4Star
| | | | | | | If size=16M offset=2K then we should map two supersections rather than just one. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] spelling fixesSimon Arlott2007-05-201-1/+1
| | | | | | | Spelling fixes in arch/arm/. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 10: allow memory type to be specified with ioremapRussell King2007-05-051-11/+9Star
| | | | | | | | | | | | | | __ioremap() took a set of page table flags (specifically the cacheable and bufferable bits) to control the mapping type. However, with the advent of ARMv6, this is far too limited. Replace the page table flags with a memory type index, so that the desired attributes can be selected from the mem_type table. Finally, to prevent silent miscompilation due to the differing arguments, rename the __ioremap() and __ioremap_pfn() functions. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 6: allow mem_types table to specify extended pte attributesRussell King2007-04-211-1/+2
| | | | | | | | Add prot_pte_ext to the mem_types table to allow the extended pte attributes to be passed to set_pte_ext(), thereby permitting us to specify memory type information for the hardware PTE entries. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 5: Use mem_types table in ioremapRussell King2007-04-211-38/+27Star
| | | | | | | We really want to be using the memory type table in ioremap, so we only have to do the CPU type fixups in one place. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] mm 3: separate out supersection mappings, avoid for <4GBRussell King2007-04-211-1/+1
| | | | | | | | | | | | | | | | | | | | Catalin Marinas at ARM Ltd says: > The CPU architects in ARM intended supersections only as a way to map > addresses >= 4GB. Supersections are not mandated by the architecture > and there is no easy way to detect their hardware support at run-time > (other than checking for a specific core). From the analysis done in > ARM, there wasn't a clear performance gain by using supersections > rather than sections (no significant improvement in the TLB misses). Therefore, we should avoid using supersections unless there's a real need (iow, we're mapping addresses >= 4GB). This means that we can simplify create_mapping() a bit since we will only use supersection mappings for addresses >= 4GB, which means that the physical, virtual and length must be multiples of the supersection mapping size. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 4112/1: Only ioremap to supersections if DOMAIN_IO is zeroCatalin Marinas2007-01-251-1/+2
| | | | | | | | | Supersections do not have a field for the domain and it is always 0. This patch prevents the creation of supersections during ioremap when DOMAIN_IO is not zero (i.e. !defined(CONFIG_IO_36)). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Fix BUG()s in ioremap() codeRussell King2006-12-181-0/+2
| | | | | | | | We need to ensure that the area size is page aligned so that remap_area_pte() doesn't increment the address past the end of the desired area. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Clean up ioremap codeRussell King2006-12-131-58/+40Star
| | | | | | | Since we're keeping the ioremap code, we might as well keep it as close to the standard kernel as possible. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Unuse another Linux PTE bitRussell King2006-12-131-2/+2
| | | | | | | | | | L_PTE_ASID is not really required to be stored in every PTE, since we can identify it via the address passed to set_pte_at(). So, create set_pte_ext() which takes the address of the PTE to set, the Linux PTE value, and the additional CPU PTE bits which aren't encoded in the Linux PTE value. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [PATCH] arm: it's OK to pass pointer to volatile as iounmap() argument...Al Viro2006-10-091-3/+3
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Standardize pxx_page macrosDave McCracken2006-09-261-1/+1
| | | | | | | | | | | | | | | | | | | | | One of the changes necessary for shared page tables is to standardize the pxx_page macros. pte_page and pmd_page have always returned the struct page associated with their entry, while pte_page_kernel and pmd_page_kernel have returned the kernel virtual address. pud_page and pgd_page, on the other hand, return the kernel virtual address. Shared page tables needs pud_page and pgd_page to return the actual page structures. There are very few actual users of these functions, so it is simple to standardize their usage. Since this is basic cleanup, I am submitting these changes as a standalone patch. Per Hugh Dickins' comments about it, I am also changing the pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning. Signed-off-by: Dave McCracken <dmccr@us.ibm.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [ARM] 3734/1: Fix the unused variable warning in __iounmap()Catalin Marinas2006-07-291-0/+2
| | | | | | | | | | Patch from Catalin Marinas This patch adds #ifdef around some variables in the arch/arm/mm/ioremap.c file. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Fix warning in consistent.cRussell King2006-07-031-2/+1Star
| | | | | | | | No need for 'cr' to be a local variable, which is unused in the SMP case, and only used once in the UP case. Just call get_cr() directly. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 3708/2: fix SMP build after section ioremap changesLennert Buytenhek2006-07-031-0/+2
| | | | | | | | | | Patch from Lennert Buytenhek Commit ff0daca525dde796382b9ccd563f169df2571211 broke the SMP build, this patch fixes it up again. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 3705/1: add supersection support to ioremap()Lennert Buytenhek2006-07-011-3/+63
| | | | | | | | | | | Patch from Lennert Buytenhek Analogous to the previous patch that allows ioremap() to use section mappings, this patch allows ioremap() to use supersection mappings. Original patch by Deepak Saxena. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Add section support to ioremapRussell King2006-06-291-4/+163
| | | | | | | | | | | | Allow section mappings to be setup using ioremap() and torn down with iounmap(). This requires additional support in the MM context switch to ensure that mappings are properly synchronised when mapped in. Based an original implementation by Deepak Saxena, reworked and ARMv6 support added by rmk. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] nommu: add stubs for ioremap and friendsRussell King2006-06-281-47/+0Star
| | | | | | | | | | | nommu doesn't have any form of remapping support, so ioremap, etc become stubs which just return the casted address, doing nothing else. Move ioport_map(), ioport_unmap(), pci_iomap(), pci_iounmap() into a separate file which is always built. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 3526/1: ioremap should use vunmap instead of vfree on ARMCatalin Marinas2006-05-161-2/+2
| | | | | | | | | | Patch from Catalin Marinas This patch modifies the __ioremap_pfn and __iounmap functions in arch/arm/mm/ioremap.c to use vunmap instead of vfree. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Remove unnecessary asm/hardware.h includesRussell King2006-03-211-1/+0Star
| | | | | | | | | asm/hardware.h is not required for the majority of processor support files, ioremap support, mm initialisation, acorn IO support, nor the debug code (which picks up its machine specific includes via debug-macros.S) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Fix ioremap.c vfree type warningRussell King2006-01-201-1/+1
| | | | | | | | arch/arm/mm/ioremap.c:145: warning: passing argument 1 of 'vfree' makes pointer from integer without a cast resulted from commit id 9d4ae7276ae26c5bfba6207cf05340af1931d8d4 Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 3070/2: Add __ioremap_pfn() APIDeepak Saxena2006-01-091-20/+29
| | | | | | | | | | | | | | | | | | | | Patch from Deepak Saxena In working on adding 36-bit addressed supersection support to ioremap(), I came to the conclusion that it would be far simpler to do so by just splitting __ioremap() into a main external interface and adding an __ioremap_pfn() function that takes a pfn + offset into the page that __ioremap() can call. This way existing callers of __ioremap() won't have to change their code and 36-bit systems will just call __ioremap_pfn() and we will not have to deal with unsigned long long variables. Note that __ioremap_pfn() should _NOT_ be called directly by drivers but is reserved for use by arch_ioremap() implementations that map 32-bit resource regions into the real 36-bit address and then call this new function. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] __ioremap doesn't use 4th argumentRussell King2005-11-171-2/+1Star
| | | | | | | | The "align" argument in ARMs __ioremap is unused and provides a misleading expectation that it might do something. It doesn't. Remove it. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [PATCH] mm: init_mm without ptlockHugh Dickins2005-10-301-3/+1Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | First step in pushing down the page_table_lock. init_mm.page_table_lock has been used throughout the architectures (usually for ioremap): not to serialize kernel address space allocation (that's usually vmlist_lock), but because pud_alloc,pmd_alloc,pte_alloc_kernel expect caller holds it. Reverse that: don't lock or unlock init_mm.page_table_lock in any of the architectures; instead rely on pud_alloc,pmd_alloc,pte_alloc_kernel to take and drop it when allocating a new one, to check lest a racing task already did. Similarly no page_table_lock in vmalloc's map_vm_area. Some temporary ugliness in __pud_alloc and __pmd_alloc: since they also handle user mms, which are converted only by a later patch, for now they have to lock differently according to whether or not it's init_mm. If sources get muddled, there's a danger that an arch source taking init_mm.page_table_lock will be mixed with common source also taking it (or neither take it). So break the rules and make another change, which should break the build for such a mismatch: remove the redundant mm arg from pte_alloc_kernel (ppc64 scrapped its distinct ioremap_mm in 2.6.13). Exceptions: arm26 used pte_alloc_kernel on user mm, now pte_alloc_map; ia64 used pte_alloc_map on init_mm, now pte_alloc_kernel; parisc had bad args to pmd_alloc and pte_alloc_kernel in unused USE_HPPA_IOREMAP code; ppc64 map_io_page forgot to unlock on failure; ppc mmu_mapin_ram and ppc64 im_free took page_table_lock for no good reason. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [ARM] 3/4: Remove asm/hardware.h from SA1100 io.hRussell King2005-10-281-0/+1
| | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [PATCH] ARM: Add iomap support for ARMRussell King2005-06-201-0/+47
| | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* Linux-2.6.12-rc2Linus Torvalds2005-04-171-0/+172
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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