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* Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds2015-06-271-16/+31
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull MIPS updates from Ralf Baechle: - Improvements to the tlb_dump code - KVM fixes - Add support for appended DTB - Minor improvements to the R12000 support - Minor improvements to the R12000 support - Various platform improvments for BCM47xx - The usual pile of minor cleanups - A number of BPF fixes and improvments - Some improvments to the support for R3000 and DECstations - Some improvments to the ATH79 platform support - A major patchset for the JZ4740 SOC adding support for the CI20 platform - Add support for the Pistachio SOC - Minor BMIPS/BCM63xx platform support improvments. - Avoid "SYNC 0" as memory barrier when unlocking spinlocks - Add support for the XWR-1750 board. - Paul's __cpuinit/__cpuinitdata cleanups. - New Malta CPU board support large memory so enable ZONE_DMA32. * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (131 commits) MIPS: spinlock: Adjust arch_spin_lock back-off time MIPS: asmmacro: Ensure 64-bit FP registers are used with MSA MIPS: BCM47xx: Simplify handling SPROM revisions MIPS: Cobalt Don't use module_init in non-modular MTD registration. MIPS: BCM47xx: Move NVRAM driver to the drivers/firmware/ MIPS: use for_each_sg() MIPS: BCM47xx: Don't select BCMA_HOST_PCI MIPS: BCM47xx: Add helper variable for storing NVRAM length MIPS: IRQ/IP27: Move IRQ allocation API to platform code. MIPS: Replace smp_mb with release barrier function in unlocks. MIPS: i8259: DT support MIPS: Malta: Basic DT plumbing MIPS: include errno.h for ENODEV in mips-cm.h MIPS: Define GCR_GIC_STATUS register fields MIPS: BPF: Introduce BPF ASM helpers MIPS: BPF: Use BPF register names to describe the ABI MIPS: BPF: Move register definition to the BPF header MIPS: net: BPF: Replace RSIZE with SZREG MIPS: BPF: Free up some callee-saved registers MIPS: Xtalk: Update xwidget.h with known Xtalk device numbers ...
| * MIPS: Optimise non-EVA kernel user memory accessesPaul Burton2015-06-211-16/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commits ac1d8590d3ae (MIPS: asm: uaccess: Use EVA instructions wrappers), 05c6516005c4 (MIPS: asm: uaccess: Add EVA support to copy_{in, to,from}_user) & e3a9b07a9caf (MIPS: asm: uaccess: Add EVA support for str*_user operations) added checks to various user memory access functions & macros in order to determine whether to perform standard memory accesses or their EVA userspace equivalents. In kernels built without support for EVA these checks are entirely redundant. Avoid emitting them & allow the compiler to optimise out the EVA userspace code in such kernels by checking config_enabled(CONFIG_EVA). This reduces the size of a malta_defconfig kernel built using GCC 4.9.2 by approximately 33KB (from 5995072 to 5962304 bytes). Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/10165/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* | mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are ↵David Hildenbrand2015-05-191-15/+30
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | enabled In general, non-atomic variants of user access functions must not sleep if pagefaults are disabled. Let's update all relevant comments in uaccess code. This also reflects the might_sleep() checks in might_fault(). Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-4-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* MIPS: uaccess.h: Fix strnlen_user comment.Ralf Baechle2014-11-241-4/+2
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Remove __strlen_user().Ralf Baechle2014-11-241-27/+0
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Zero variable read by get_user / __get_user in case of an error.Ralf Baechle2014-11-191-1/+4
| | | | | | This wasn't happening in all cases. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: asm: uaccess: Add v1 register to clobber list on EVAMarkos Chandras2014-11-191-3/+4
| | | | | | | | | | | | | | | | | When EVA is turned on and prefetching is being used in memcpy.S, the v1 register is being used as a helper register to the PREFE instruction. However, v1 ($3) was not in the clobber list, which means that the compiler did not preserve it across function calls, and that could corrupt the value of the register leading to all sorts of userland crashes. We fix this problem by using the DADDI_SCRATCH macro to define the clobbered register when CONFIG_EVA && CONFIG_CPU_HAS_PREFETCH are enabled. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Cc: <stable@vger.kernel.org> # v3.15+ Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8510/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: asm: uaccess: Add EVA support for str*_user operationsMarkos Chandras2014-03-261-53/+119
| | | | | | | | | | | The str*_user functions are used to securely access NULL terminated strings from userland. Therefore, it's necessary to use the appropriate EVA function. However, if the string is in kernel space, then the normal instructions are being used to access it. The __str*_kernel_asm and __str*_user_asm symbols are the same for non-EVA mode so there is no functional change for the non-EVA kernels. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: asm: uaccess: Add EVA support to copy_{in, to,from}_userMarkos Chandras2014-03-261-20/+171
| | | | | | | | | | | Use the EVA specific functions from memcpy.S to perform userspace operations. When get_fs() == get_ds() the usual load/store instructions are used because the destination address is located in the kernel address space region. Otherwise, the EVA specifc load/store instructions are used which will go through th TLB to perform the virtual to physical translation for the userspace address. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: asm: uaccess: Rename {get,put}_user_asm macrosMarkos Chandras2014-03-261-30/+30
| | | | | | | | The {get,put}_user_asm functions can be used to load data from kernel or the user address space so rename them to avoid confusion. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: asm: uaccess: Use EVA instructions wrappersMarkos Chandras2014-03-261-24/+109
| | | | | | | Use the EVA instruction wrappers from asm.h to perform read/write operations from userland. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: asm: uaccess: Disable unaligned access macros for EVALeonid Yegoshin2014-03-261-0/+6
| | | | | | | | | | ulb, ulh, ulw are macros which emulate unaligned access for MIPS. However, no such macros exist for EVA mode, so the only way to do EVA unaligned accesses is in the ADE exception handler. As a result of which, disable these macros for EVA. Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: asm: uaccess: Move duplicated code to common functionMarkos Chandras2014-03-261-32/+29
| | | | | | | Similar to __get_user_* functions, move common code to __put_user_*_common so it can be shared among similar users. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: asm: uaccess: Add instruction argument to __{put,get}_user_asmMarkos Chandras2014-03-261-13/+13
| | | | | | | | | In preparation for EVA support, an instruction argument is needed for the __get_user_asm{,_ll32} functions to allow instruction overrides in EVA mode. Even though EVA only works for MIPS 32-bit, both codepaths are changed (32-bit and 64-bit) for consistency reasons. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* Merge branch 'mti-next' of ↵Ralf Baechle2013-05-091-2/+12
|\ | | | | | | git://git.linux-mips.org/pub/scm/sjhill/linux-sjhill into mips-for-linux-next
| * MIPS: microMIPS: Disable LL/SC and fix linker bug.Steven J. Hill2013-05-091-2/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | Partially revert commit e0c14a260d66ba35935600d6435940a566fe806b and turn off LL/SC when building a pure microMIPS kernel. This is a temporary fix until the cmpxchg assembly macro functions are re-written to not use the HI/LO registers in address calculations. Also add .insn in selected user access functions which would otherwise produce ISA mode jump incompatibilities. This is also a temporary fix. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
* | KVM/MIPS32: KVM Guest kernel support.Sanjay Lal2013-05-081-1/+10
|/ | | | | | | | | | | | | Both Guest kernel and Guest Userspace execute in UM. The memory map is as follows: Guest User address space: 0x00000000 -> 0x40000000 Guest Kernel Unmapped: 0x40000000 -> 0x60000000 Guest Kernel Mapped: 0x60000000 -> 0x80000000 - Guest Usermode virtual memory is limited to 1GB. Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Whitespace cleanup.Ralf Baechle2013-02-011-51/+51
| | | | | | | | Having received another series of whitespace patches I decided to do this once and for all rather than dealing with this kind of patches trickling in forever. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Unify memcpy.S and memcpy-inatomic.SDavid Daney2012-07-231-3/+3
| | | | | | | | | | | | We can save the 451 lines of code that comprise memcpy-inatomic.S at the expense of a single instruction in the memcpy prolog. We also use an additional register (t6), so this may cause increased register pressure in some places as well. But I think the reduced maintenance burden, of not having two nearly identical implementations, makes it worth it. Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Make TASK_SIZE reflect proper size for both 32 and 64 bit processes.David Daney2010-10-291-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The TASK_SIZE macro should reflect the size of a user process virtual address space. Previously for 64-bit kernels, this was not the case. The immediate cause of pain was in hugetlbfs/inode.c:hugetlb_get_unmapped_area() where 32-bit processes trying to mmap a huge page would be served a page with an address outside of the 32-bit address range. But there are other uses of TASK_SIZE in the kernel as well that would like an accurate value. The new definition is nice because it now makes TASK_SIZE and TASK_SIZE_OF() yield the same value for any given process. For 32-bit kernels there should be no change, although I did factor out some code in asm/processor.h that became identical for the 32-bit and 64-bit cases. __UA_LIMIT is now set to ~((1 << SEGBITS) - 1) for 64-bit kernels. This should eliminate the possibility of getting a AddressErrorException in the kernel for addresses that pass the access_ok() test. With the patch applied, I can still run o32, n32 and n64 processes, and have an o32 shell fork/exec both n32 and n64 processes. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1701/
* MIPS: Fix sparse warning in incompatiable argument type of clear_user.Wu Zhangjin2009-05-221-1/+1
| | | | | | | | | The type of the second argument of access_ok should be (void __user *). The unnecessary conversion of the clear_user address argument was causing sparse to emit warnings on the __chk_user_ptr check. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: uaccess: Switch lock annotations to might_fault().Ralf Baechle2009-05-141-16/+21
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Make uaccess.h slightly more sparse friendly.Ralf Baechle2009-05-141-12/+27
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Make access_ok() sideeffect proof.Ralf Baechle2009-05-141-3/+13
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Replace use of <asm-generic/uaccess.h> with native implementations.Ralf Baechle2008-10-111-1/+263
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Move headfiles to new location below arch/mips/includeRalf Baechle2008-10-111-0/+852
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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