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2016-12-24Replace <asm/uaccess.h> with <linux/uaccess.h> globallyLinus Torvalds13-13/+13
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-20Merge tag 'xtensa-20161219' of git://github.com/jcmvbkbc/linux-xtensaLinus Torvalds8-133/+174
Pull Xtensa updates from Max Filippov: - enable HAVE_DMA_CONTIGUOUS, configure shared DMA pool reservation in kc705 DTS - update xtensa DMA-related Documentation/features entries - clean up arch/xtensa/kernel/setup.c: move S32C1I self-test out of it, remove unused declarations, fix screen_info definition * tag 'xtensa-20161219' of git://github.com/jcmvbkbc/linux-xtensa: xtensa: update DMA-related Documentation/features entries xtensa: configure shared DMA pool reservation in kc705 DTS xtensa: enable HAVE_DMA_CONTIGUOUS xtensa: move S32C1I self-test to a separate file xtensa: fix screen_info, clean up unused declarations in setup.c
2016-12-15xtensa: configure shared DMA pool reservation in kc705 DTSMax Filippov1-0/+16
Add example 64MByte long reservation in the first 512MBytes of physical memory used as shared DMA pool. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-12-15xtensa: enable HAVE_DMA_CONTIGUOUSMax Filippov4-4/+21
Enable HAVE_DMA_CONTIGUOUS, reserve contiguous memory at bootmem_init, use dma_alloc_from_contiguous and dma_release_from_contiguous in xtensa_dma_alloc/free. This allows for big contiguous DMA buffer allocation from designated area configured in the device tree. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-12-14arch/xtensa: add option to skip DMA sync as a part of mappingAlexander Duyck1-2/+5
This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to avoid invoking cache line invalidation if the driver will just handle it via a sync_for_cpu or sync_for_device call. Link: http://lkml.kernel.org/r/20161110113555.76501.52536.stgit@ahduyck-blue-test.jf.intel.com Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-12Merge branch 'locking-core-for-linus' of ↵Linus Torvalds2-10/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull locking updates from Ingo Molnar: "The tree got pretty big in this development cycle, but the net effect is pretty good: 115 files changed, 673 insertions(+), 1522 deletions(-) The main changes were: - Rework and generalize the mutex code to remove per arch mutex primitives. (Peter Zijlstra) - Add vCPU preemption support: add an interface to query the preemption status of vCPUs and use it in locking primitives - this optimizes paravirt performance. (Pan Xinhui, Juergen Gross, Christian Borntraeger) - Introduce cpu_relax_yield() and remov cpu_relax_lowlatency() to clean up and improve the s390 lock yielding machinery and its core kernel impact. (Christian Borntraeger) - Micro-optimize mutexes some more. (Waiman Long) - Reluctantly add the to-be-deprecated mutex_trylock_recursive() interface on a temporary basis, to give the DRM code more time to get rid of its locking hacks. Any other users will be NAK-ed on sight. (We turned off the deprecation warning for the time being to not pollute the build log.) (Peter Zijlstra) - Improve the rtmutex code a bit, in light of recent long lived bugs/races. (Thomas Gleixner) - Misc fixes, cleanups" * 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (36 commits) x86/paravirt: Fix bool return type for PVOP_CALL() x86/paravirt: Fix native_patch() locking/ww_mutex: Use relaxed atomics locking/rtmutex: Explain locking rules for rt_mutex_proxy_unlock()/init_proxy_locked() locking/rtmutex: Get rid of RT_MUTEX_OWNER_MASKALL x86/paravirt: Optimize native pv_lock_ops.vcpu_is_preempted() locking/mutex: Break out of expensive busy-loop on {mutex,rwsem}_spin_on_owner() when owner vCPU is preempted locking/osq: Break out of spin-wait busy waiting loop for a preempted vCPU in osq_lock() Documentation/virtual/kvm: Support the vCPU preemption check x86/xen: Support the vCPU preemption check x86/kvm: Support the vCPU preemption check x86/kvm: Support the vCPU preemption check kvm: Introduce kvm_write_guest_offset_cached() locking/core, x86/paravirt: Implement vcpu_is_preempted(cpu) for KVM and Xen guests locking/spinlocks, s390: Implement vcpu_is_preempted(cpu) locking/core, powerpc: Implement vcpu_is_preempted(cpu) sched/core: Introduce the vcpu_is_preempted(cpu) interface sched/wake_q: Rename WAKE_Q to DEFINE_WAKE_Q locking/core: Provide common cpu_relax_yield() definition locking/mutex: Don't mark mutex_trylock_recursive() as deprecated, temporarily ...
2016-11-30tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPINGFrancis Yan1-0/+2
This patch exports the sender chronograph stats via the socket SO_TIMESTAMPING channel. Currently we can instrument how long a particular application unit of data was queued in TCP by tracking SOF_TIMESTAMPING_TX_SOFTWARE and SOF_TIMESTAMPING_TX_SCHED. Having these sender chronograph stats exported simultaneously along with these timestamps allow further breaking down the various sender limitation. For example, a video server can tell if a particular chunk of video on a connection takes a long time to deliver because TCP was experiencing small receive window. It is not possible to tell before this patch without packet traces. To prepare these stats, the user needs to set SOF_TIMESTAMPING_OPT_STATS and SOF_TIMESTAMPING_OPT_TSONLY flags while requesting other SOF_TIMESTAMPING TX timestamps. When the timestamps are available in the error queue, the stats are returned in a separate control message of type SCM_TIMESTAMPING_OPT_STATS, in a list of TLVs (struct nlattr) of types: TCP_NLA_BUSY_TIME, TCP_NLA_RWND_LIMITED, TCP_NLA_SNDBUF_LIMITED. Unit is microsecond. Signed-off-by: Francis Yan <francisyyan@gmail.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-11-22Merge branch 'linus' into locking/core, to pick up fixesIngo Molnar3-60/+37
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-11-17locking/core: Provide common cpu_relax_yield() definitionChristian Borntraeger1-1/+0
No need to duplicate the same define everywhere. Since the only user is stop-machine and the only provider is s390, we can use a default implementation of cpu_relax_yield() in sched.h. Suggested-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-s390 <linux-s390@vger.kernel.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: sparclinux@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1479298985-191589-1-git-send-email-borntraeger@de.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-11-16xtensa: move S32C1I self-test to a separate fileMax Filippov3-115/+129
The test is not called from any of the setup functions, so there's no reason keeping it in the setup.c. Move it to s32c1i_selftest.c and drop related #include directives. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-11-16locking/core, arch: Remove cpu_relax_lowlatency()Christian Borntraeger1-1/+0
As there are no users left, we can remove cpu_relax_lowlatency() implementations from every architecture. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Cc: <linux-arch@vger.kernel.org> Link: http://lkml.kernel.org/r/1477386195-32736-6-git-send-email-borntraeger@de.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-11-16locking/core: Introduce cpu_relax_yield()Christian Borntraeger1-0/+1
For spinning loops people do often use barrier() or cpu_relax(). For most architectures cpu_relax and barrier are the same, but on some architectures cpu_relax can add some latency. For example on power,sparc64 and arc, cpu_relax can shift the CPU towards other hardware threads in an SMT environment. On s390 cpu_relax does even more, it uses an hypercall to the hypervisor to give up the timeslice. In contrast to the SMT yielding this can result in larger latencies. In some places this latency is unwanted, so another variant "cpu_relax_lowlatency" was introduced. Before this is used in more and more places, lets revert the logic and provide a cpu_relax_yield that can be called in places where yielding is more important than latency. By default this is the same as cpu_relax on all architectures. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1477386195-32736-2-git-send-email-borntraeger@de.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-11-15xtensa: fix screen_info, clean up unused declarations in setup.cMax Filippov1-14/+8
screen_info on xtensa has old style initializer without field names. It was broken by the commit d9b263528e01 ("x86, setup: Store the boot cursor state") that split the unused2 field into two. Rewrite screen_info initialization with explicit field names. Drop unused declarations/tentative definitions of RTC- and FD-related structures. Drop inclusion of linux/timex.h when RTC is enabled in configuration. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-11-14xtensa: wire up new pkey_{mprotect,alloc,free} syscallsMax Filippov1-1/+8
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-11-06xtensa: clean up printk usage for boot/crash loggingMax Filippov2-59/+29
Convert printk(KERN_* to pr_* and printk's without level to pr_cont. This fixes torn register dumps, stack dumps, stack traces and timestamps in the middle of 'Calibrating CPU frequency' message. Also drop unused show_code and drop false comment about show_stack. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-10-25locking/mutex: Kill arch specific codePeter Zijlstra1-9/+0
Its all generic atomic_long_t stuff now. Tested-by: Jason Low <jason.low2@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-10-11Merge branch 'work.uaccess2' of ↵Linus Torvalds4-155/+162
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull uaccess.h prepwork from Al Viro: "Preparations to tree-wide switch to use of linux/uaccess.h (which, obviously, will allow to start unifying stuff for real). The last step there, ie PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ `git grep -l "$PATT"|grep -v ^include/linux/uaccess.h` is not taken here - I would prefer to do it once just before or just after -rc1. However, everything should be ready for it" * 'work.uaccess2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: remove a stray reference to asm/uaccess.h in docs sparc64: separate extable_64.h, switch elf_64.h to it score: separate extable.h, switch module.h to it mips: separate extable.h, switch module.h to it x86: separate extable.h, switch sections.h to it remove stray include of asm/uaccess.h from cacheflush.h mn10300: remove a bogus processor.h->uaccess.h include xtensa: split uaccess.h into C and asm sides bonding: quit messing with IOCTL kill __kernel_ds_p off mn10300: finish verify_area() off frv: move HAVE_ARCH_UNMAPPED_AREA to pgtable.h exceptions: detritus removal
2016-10-10Merge branch 'mm-pkeys-for-linus' of ↵Linus Torvalds1-0/+5
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull protection keys syscall interface from Thomas Gleixner: "This is the final step of Protection Keys support which adds the syscalls so user space can actually allocate keys and protect memory areas with them. Details and usage examples can be found in the documentation. The mm side of this has been acked by Mel" * 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/pkeys: Update documentation x86/mm/pkeys: Do not skip PKRU register if debug registers are not used x86/pkeys: Fix pkeys build breakage for some non-x86 arches x86/pkeys: Add self-tests x86/pkeys: Allow configuration of init_pkru x86/pkeys: Default to a restrictive init PKRU pkeys: Add details of system call use to Documentation/ generic syscalls: Wire up memory protection keys syscalls x86: Wire up protection keys system calls x86/pkeys: Allocation/free syscalls x86/pkeys: Make mprotect_key() mask off additional vm_flags mm: Implement new pkey_mprotect() system call x86/pkeys: Add fault handling for PF_PK page fault bit
2016-10-07nmi_backtrace: generate one-line reports for idle cpusChris Metcalf1-0/+3
When doing an nmi backtrace of many cores, most of which are idle, the output is a little overwhelming and very uninformative. Suppress messages for cpus that are idling when they are interrupted and just emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN". We do this by grouping all the cpuidle code together into a new .cpuidle.text section, and then checking the address of the interrupted PC to see if it lies within that section. This commit suitably tags x86 and tile idle routines, and only adds in the minimal framework for other architectures. Link: http://lkml.kernel.org/r/1472487169-14923-5-git-send-email-cmetcalf@mellanox.com Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Daniel Thompson <daniel.thompson@linaro.org> [arm] Tested-by: Petr Mladek <pmladek@suse.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-05Merge tag 'xtensa-20161005' of git://github.com/jcmvbkbc/linux-xtensaLinus Torvalds41-1899/+1659
Pull Xtensa updates from Max Filippov: "Updates for the xtensa architecture. It is a combined set of patches for 4.8 that never got to the mainline and new patches for 4.9. - add new kernel memory layouts for MMUv3 cores: with 256MB and 512MB KSEG size, starting at physical address other than 0 - make kernel load address configurable - clean up kernel memory layout macros - drop sysmem early allocator and switch to memblock - enable kmemleak and memory reservation from the device tree - wire up new syscalls: userfaultfd, membarrier, mlock2, copy_file_range, preadv2 and pwritev2 - add new platform: Cadence Configurable System Platform (CSP) and new core variant for it: xt_lnx - rearrange CCOUNT calibration code, make most of it generic - improve machine reset code (XTFPGA now reboots reliably with MMUv3 cores) - provide default memmap command line option for configurations without device tree support - ISS fixes: simdisk is now capable of using highmem pages, panic correctly terminates simulator" * tag 'xtensa-20161005' of git://github.com/jcmvbkbc/linux-xtensa: (24 commits) xtensa: disable MMU initialization option on MMUv2 cores xtensa: add default memmap and mmio32native options to defconfigs xtensa: add default memmap option to common_defconfig xtensa: add default memmap option to iss_defconfig xtensa: ISS: allow simdisk to use high memory buffers xtensa: ISS: define simc_exit and use it instead of inline asm xtensa: xtfpga: group platform_* functions together xtensa: rearrange CCOUNT calibration xtensa: xtfpga: use clock provider, don't update DT xtensa: Tweak xuartps UART driver Rx watermark for Cadence CSP config. xtensa: initialize MMU before jumping to reset vector xtensa: fix icountlevel setting in cpu_reset xtensa: extract common CPU reset code into separate function xtensa: Added Cadence CSP kernel configuration for Xtensa xtensa: fix default kernel load address xtensa: wire up new syscalls xtensa: support reserved-memory DT node xtensa: drop sysmem and switch to memblock xtensa: minimize use of PLATFORM_DEFAULT_MEM_{ADDR,SIZE} xtensa: cleanup MMU setup and kernel layout macros ...
2016-09-29xtensa: disable MMU initialization option on MMUv2 coresMax Filippov1-0/+1
MMU initialization option is currently ignored on MMUv2 cores, but it is used in Kconfig to select kernel load and start addresses. This choice is not available for MMUv2 cores as they have hardwired TLB entries. Disable MMU initialization option for known MMUv2 cores so that they get correct kernel load/start address by default. This fixes the default allmodconfig build. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-27xtensa: split uaccess.h into C and asm sidesAl Viro4-144/+162
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-09-27exceptions: detritus removalAl Viro1-11/+0
externs and defines for stuff that is never used Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-09-20xtensa: add default memmap and mmio32native options to defconfigsMax Filippov4-4/+4
Now that memory initialization doesn't add default memory region specify it explicitly in the memmap command line option in case somebody wants to boot in non-DT-enabled configuration. While at it update earlycon access mode to mmio32native to support both LE and BE cores transparently. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-20xtensa: add default memmap option to common_defconfigMax Filippov1-605/+4
Now that memory initialization doesn't add default memory region specify it explicitly in the memmap command line option. Save common_defconfig as defconfig so that it doesn't have all option settings in it, only those that are different from the Kconfig defaults. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-20xtensa: add default memmap option to iss_defconfigMax Filippov1-726/+2
Now that memory initialization doesn't add default memory region specify it explicitly in the memmap command line option. Save iss_defconfig as defconfig so that it doesn't have all option settings in it, only those that are different from the Kconfig defaults. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-20xtensa: ISS: allow simdisk to use high memory buffersMax Filippov1-0/+1
ISS kernel by default has only low memory. But it may be configured to support high memory and started in a simulator with more than 128M of RAM. Simdisk driver in such configuration can get IO request with a high memory page. There may be no TLB entry for that page, only page table entry. However simulators don't do pagewalking, so such IO request will fail. Touch IO buffer in the buffer read/write loop so that a TLB entry is likely there when read or write simcall is invoked. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-20xtensa: ISS: define simc_exit and use it instead of inline asmMax Filippov2-3/+10
A number of ISS platform functions use inline assembly to invoke simulator exit, not all correctly. Define simc_exit(exit_code) and use it instead of inline assembly. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-20xtensa: xtfpga: group platform_* functions togetherMax Filippov1-24/+22
Group platform_* functions together and turn two separate #ifdef/#ifndef blocks into single #ifdef/#else. No functional changes. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-20xtensa: rearrange CCOUNT calibrationMax Filippov4-44/+41
DT-enabled kernel should have a CPU node connected to a clock. This clock is the CCOUNT clock. Use old platform_calibrate_ccount call as a fallback when CPU node cannot be found or has no clock and in non-DT-enabled configurations. Drop no longer needed code that updates CPU clock-frequency property in the DT; drop DT-related code from the platform_calibrate_ccount too. Move of_clk_init to the top of time_init, so that clocks are initialized before CCOUNT calibration is attempted. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-20xtensa: xtfpga: use clock provider, don't update DTMax Filippov2-9/+35
Instead of querying hardcoded FPGA frequency register and then updating clock-frequency property in specificly named DT nodes in machine setup code register a clock provider that returns fixed-rate clock, configured by register specified in DT. This way we have less magic/hardcoded names and use more existing common clock framework code. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Tested-by: Guenter Roeck <linux@roeck-us.net>
2016-09-19xtensa: Tweak xuartps UART driver Rx watermark for Cadence CSP config.Scott Telford1-1/+1
Add module parameter xilinx_uartps.rx_trigger_level=32 to command line options for CSP to set Rx watermark for xuartps driver lower than the default value, to avoid UART overruns at 115200 bps. Signed-off-by: Scott Telford <stelford@cadence.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-11xtensa: initialize MMU before jumping to reset vectorMax Filippov1-0/+108
When reset is simulated MMU need to be brought into its initial state, because that's what bootloaders/OS kernels assume. This is especially important for MMUv3 because TLB state when the kernel is running is significatly different from its reset state. With this change it is possible to boot linux and get back to U-Boot repeatedly. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-11xtensa: fix icountlevel setting in cpu_resetMax Filippov1-1/+1
icountlevel SR value specifies lowest intlevel that does not do instruction counting, so to disable instruction counting completely it must be set to 0, not to 15. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-11xtensa: extract common CPU reset code into separate functionMax Filippov5-60/+32
platform_restart implementatations do the same thing to reset CPU. Don't duplicate that code, move it to a function and call it from platform_restart. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-09xtensa: Added Cadence CSP kernel configuration for XtensaScott Telford5-0/+1106
Added defconfig, device tree and Xtensa variant header files for the Cadence Configurable System Platform "xt_lnx" processor configuration. Signed-off-by: Scott Telford <stelford@cadence.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-09xtensa: fix default kernel load addressMax Filippov1-2/+4
Make default kernel load address 0xd0003000 for MMUv2 cores and 0x60003000 for noMMU cores. Don't initialize MMU inside vmlinux for predefined MMUv2 cores (it's noop anyway). This fixes the following defconfig build error: arch/xtensa/kernel/built-in.o: In function `fast_alloca': (.text+0x99a): dangerous relocation: j: cannot encode: _WindowUnderflow12 arch/xtensa/kernel/built-in.o: In function `fast_alloca': (.text+0x99d): dangerous relocation: j: cannot encode: _WindowUnderflow8 arch/xtensa/kernel/built-in.o: In function `fast_alloca': (.text+0x9a0): dangerous relocation: j: cannot encode: _WindowUnderflow4 arch/xtensa/kernel/built-in.o: In function `window_overflow_restore_a0_fixup': (.text+0x23a3): dangerous relocation: j: cannot encode: (.DoubleExceptionVector.text+0x104) arch/xtensa/kernel/built-in.o: In function `window_overflow_restore_a0_fixup': (.text+0x23c1): dangerous relocation: j: cannot encode: (.DoubleExceptionVector.text+0x104) arch/xtensa/kernel/built-in.o: In function `window_overflow_restore_a0_fixup': (.text+0x23dd): dangerous relocation: j: cannot encode: (.DoubleExceptionVector.text+0x104) With this change all xtensa defconfigs build correctly. Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-09x86/pkeys: Allocation/free syscallsDave Hansen1-0/+5
This patch adds two new system calls: int pkey_alloc(unsigned long flags, unsigned long init_access_rights) int pkey_free(int pkey); These implement an "allocator" for the protection keys themselves, which can be thought of as analogous to the allocator that the kernel has for file descriptors. The kernel tracks which numbers are in use, and only allows operations on keys that are valid. A key which was not obtained by pkey_alloc() may not, for instance, be passed to pkey_mprotect(). These system calls are also very important given the kernel's use of pkeys to implement execute-only support. These help ensure that userspace can never assume that it has control of a key unless it first asks the kernel. The kernel does not promise to preserve PKRU (right register) contents except for allocated pkeys. The 'init_access_rights' argument to pkey_alloc() specifies the rights that will be established for the returned pkey. For instance: pkey = pkey_alloc(flags, PKEY_DENY_WRITE); will allocate 'pkey', but also sets the bits in PKRU[1] such that writing to 'pkey' is already denied. The kernel does not prevent pkey_free() from successfully freeing in-use pkeys (those still assigned to a memory range by pkey_mprotect()). It would be expensive to implement the checks for this, so we instead say, "Just don't do it" since sane software will never do it anyway. Any piece of userspace calling pkey_alloc() needs to be prepared for it to fail. Why? pkey_alloc() returns the same error code (ENOSPC) when there are no pkeys and when pkeys are unsupported. They can be unsupported for a whole host of reasons, so apps must be prepared for this. Also, libraries or LD_PRELOADs might steal keys before an application gets access to them. This allocation mechanism could be implemented in userspace. Even if we did it in userspace, we would still need additional user/kernel interfaces to tell userspace which keys are being used by the kernel internally (such as for execute-only mappings). Having the kernel provide this facility completely removes the need for these additional interfaces, or having an implementation of this in userspace at all. Note that we have to make changes to all of the architectures that do not use mman-common.h because we use the new PKEY_DENY_ACCESS/WRITE macros in arch-independent code. 1. PKRU is the Protection Key Rights User register. It is a usermode-accessible register that controls whether writes and/or access to each individual pkey is allowed or denied. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Cc: linux-arch@vger.kernel.org Cc: Dave Hansen <dave@sr71.net> Cc: arnd@arndb.de Cc: linux-api@vger.kernel.org Cc: linux-mm@kvack.org Cc: luto@kernel.org Cc: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org Link: http://lkml.kernel.org/r/20160729163015.444FE75F@viggo.jf.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-08-04dma-mapping: use unsigned long for dma_attrsKrzysztof Kozlowski1-6/+6
The dma-mapping core and the implementations do not change the DMA attributes passed by pointer. Thus the pointer can point to const data. However the attributes do not have to be a bitfield. Instead unsigned long will do fine: 1. This is just simpler. Both in terms of reading the code and setting attributes. Instead of initializing local attributes on the stack and passing pointer to it to dma_set_attr(), just set the bits. 2. It brings safeness and checking for const correctness because the attributes are passed by value. Semantic patches for this change (at least most of them): virtual patch virtual context @r@ identifier f, attrs; @@ f(..., - struct dma_attrs *attrs + unsigned long attrs , ...) { ... } @@ identifier r.f; @@ f(..., - NULL + 0 ) and // Options: --all-includes virtual patch virtual context @r@ identifier f, attrs; type t; @@ t f(..., struct dma_attrs *attrs); @@ identifier r.f; @@ f(..., - NULL + 0 ) Link: http://lkml.kernel.org/r/1468399300-5399-2-git-send-email-k.kozlowski@samsung.com Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> Acked-by: Mark Salter <msalter@redhat.com> [c6x] Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> [cris] Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> [drm] Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Acked-by: Joerg Roedel <jroedel@suse.de> [iommu] Acked-by: Fabien Dessenne <fabien.dessenne@st.com> [bdisp] Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> [vb2-core] Acked-by: David Vrabel <david.vrabel@citrix.com> [xen] Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [xen swiotlb] Acked-by: Joerg Roedel <jroedel@suse.de> [iommu] Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon] Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390] Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> [avr32] Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc] Acked-by: Robin Murphy <robin.murphy@arm.com> [arm64 and dma-iommu] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-08-03Merge tag 'xtensa-for-next-20160731' of ↵Chris Zankel22-428/+303
git://github.com/jcmvbkbc/linux-xtensa into for_next Xtensa improvements for 4.8: - add new kernel memory layouts for MMUv3 cores: with 256MB and 512MB KSEG size, starting at physical address other than 0; - make kernel load address configurable; - clean up kernel memory layout macros; - drop sysmem early allocator and switch to memblock; - enable kmemleak and memory reservation from the device tree; - wire up new syscalls: userfaultfd, membarrier, mlock2, copy_file_range, preadv2 and pwritev2.
2016-07-31xtensa: wire up new syscallsMax Filippov1-1/+14
Wire up userfaultfd, membarrier, mlock2, copy_file_range, preadv2, pwritev2 Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-07-30Merge tag 'devicetree-for-4.8' of ↵Linus Torvalds1-2/+1
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull DeviceTree updates from Rob Herring: - remove most of_platform_populate() calls in arch code. Now the DT core code calls it in the default case and platforms only need to call it if they have special needs - use pr_fmt on all the DT core print statements - CoreSight binding doc improvements to block name descriptions - add dt_to_config script which can parse dts files and list corresponding kernel config options - fix memory leak hit with a PowerMac DT - correct a bunch of STMicro compatible strings to use the correct vendor prefix - fix DA9052 PMIC binding doc to match what is actually used in dts files * tag 'devicetree-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (35 commits) documentation: da9052: Update regulator bindings names to match DA9052/53 DTS expectations xtensa: Partially Revert "xtensa: Remove unnecessary of_platform_populate with default match table" xtensa: Fix build error due to missing include file MIPS: ath79: Add missing include file Fix spelling errors in Documentation/devicetree ARM: dts: fix STMicroelectronics compatible strings powerpc/dts: fix STMicroelectronics compatible strings Documentation: dt: i2c: use correct STMicroelectronics vendor prefix scripts/dtc: dt_to_config - kernel config options for a devicetree of: fdt: mark unflattened tree as detached of: overlay: add resolver error prints coresight: document binding acronyms Documentation/devicetree: document cavium-pip rx-delay/tx-delay properties of: use pr_fmt prefix for all console printing of/irq: Mark initialised interrupt controllers as populated of: fix memory leak related to safe_name() Revert "of/platform: export of_default_bus_match_table" of: unittest: use of_platform_default_populate() to populate default bus memory: omap-gpmc: use of_platform_default_populate() to populate default bus bus: uniphier-system-bus: use of_platform_default_populate() to populate default bus ...
2016-07-29Merge branch 'smp-hotplug-for-linus' of ↵Linus Torvalds1-17/+9
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull smp hotplug updates from Thomas Gleixner: "This is the next part of the hotplug rework. - Convert all notifiers with a priority assigned - Convert all CPU_STARTING/DYING notifiers The final removal of the STARTING/DYING infrastructure will happen when the merge window closes. Another 700 hundred line of unpenetrable maze gone :)" * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits) timers/core: Correct callback order during CPU hot plug leds/trigger/cpu: Move from CPU_STARTING to ONLINE level powerpc/numa: Convert to hotplug state machine arm/perf: Fix hotplug state machine conversion irqchip/armada: Avoid unused function warnings ARC/time: Convert to hotplug state machine clocksource/atlas7: Convert to hotplug state machine clocksource/armada-370-xp: Convert to hotplug state machine clocksource/exynos_mct: Convert to hotplug state machine clocksource/arm_global_timer: Convert to hotplug state machine rcu: Convert rcutree to hotplug state machine KVM/arm/arm64/vgic-new: Convert to hotplug state machine smp/cfd: Convert core to hotplug state machine x86/x2apic: Convert to CPU hotplug state machine profile: Convert to hotplug state machine timers/core: Convert to hotplug state machine hrtimer: Convert to hotplug state machine x86/tboot: Convert to hotplug state machine arm64/armv8 deprecated: Convert to hotplug state machine hwtracing/coresight-etm4x: Convert to hotplug state machine ...
2016-07-26mm: do not pass mm_struct into handle_mm_faultKirill A. Shutemov1-1/+1
We always have vma->vm_mm around. Link: http://lkml.kernel.org/r/1466021202-61880-8-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-07-26xtensa: Partially Revert "xtensa: Remove unnecessary of_platform_populate ↵Rob Herring2-2/+9
with default match table" This partially reverts commit 69d99e6c0d62 keeping only the main purpose of the original commit which is the removal of of_platform_populate() call. The moving of of_clk_init() caused changes in the initialization order breaking booting. Fixes: 69d99e6c0d621f ("xtensa: Remove unnecessary of_platform_populate with default match table") Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Guenter Roeck <linux@roeck-us.net> Tested-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2016-07-26xtensa: Fix build error due to missing include fileGuenter Roeck1-0/+1
Commit 69d99e6c0d621f ("xtensa: Remove unnecessary of_platform_populate with default match table") dropped various include files from arch/xtensa/kernel/setup.c. This results in the following build error. arch/xtensa/kernel/setup.c: In function ‘xtensa_dt_io_area’: arch/xtensa/kernel/setup.c:213:2: error: implicit declaration of function ‘of_read_ulong’ Fixes: 69d99e6c0d621f ("xtensa: Remove unnecessary of_platform_populate with default match table") Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Rob Herring <robh@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2016-07-25Merge branch 'locking-core-for-linus' of ↵Linus Torvalds2-6/+56
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull locking updates from Ingo Molnar: "The locking tree was busier in this cycle than the usual pattern - a couple of major projects happened to coincide. The main changes are: - implement the atomic_fetch_{add,sub,and,or,xor}() API natively across all SMP architectures (Peter Zijlstra) - add atomic_fetch_{inc/dec}() as well, using the generic primitives (Davidlohr Bueso) - optimize various aspects of rwsems (Jason Low, Davidlohr Bueso, Waiman Long) - optimize smp_cond_load_acquire() on arm64 and implement LSE based atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() on arm64 (Will Deacon) - introduce smp_acquire__after_ctrl_dep() and fix various barrier mis-uses and bugs (Peter Zijlstra) - after discovering ancient spin_unlock_wait() barrier bugs in its implementation and usage, strengthen its semantics and update/fix usage sites (Peter Zijlstra) - optimize mutex_trylock() fastpath (Peter Zijlstra) - ... misc fixes and cleanups" * 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits) locking/atomic: Introduce inc/dec variants for the atomic_fetch_$op() API locking/barriers, arch/arm64: Implement LDXR+WFE based smp_cond_load_acquire() locking/static_keys: Fix non static symbol Sparse warning locking/qspinlock: Use __this_cpu_dec() instead of full-blown this_cpu_dec() locking/atomic, arch/tile: Fix tilepro build locking/atomic, arch/m68k: Remove comment locking/atomic, arch/arc: Fix build locking/Documentation: Clarify limited control-dependency scope locking/atomic, arch/rwsem: Employ atomic_long_fetch_add() locking/atomic, arch/qrwlock: Employ atomic_fetch_add_acquire() locking/atomic, arch/mips: Convert to _relaxed atomics locking/atomic, arch/alpha: Convert to _relaxed atomics locking/atomic: Remove the deprecated atomic_{set,clear}_mask() functions locking/atomic: Remove linux/atomic.h:atomic_fetch_or() locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() locking/atomic: Fix atomic64_relaxed() bits locking/atomic, arch/xtensa: Implement atomic_fetch_{add,sub,and,or,xor}() locking/atomic, arch/x86: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() locking/atomic, arch/tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() locking/atomic, arch/sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() ...
2016-07-24xtensa: support reserved-memory DT nodeMax Filippov2-0/+3
This allows reserving regions of physical memory from the device tree. See Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt for more details. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-07-24xtensa: drop sysmem and switch to memblockMax Filippov4-292/+40
Memblock is the standard kernel boot-time memory tracker/allocator. Use it instead of the custom sysmem allocator. This allows using kmemleak, CMA and device tree memory reservation. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-07-24xtensa: minimize use of PLATFORM_DEFAULT_MEM_{ADDR,SIZE}Max Filippov4-30/+12
Now that the kernel load address and KSEG physical base address have their own Kconfig symbols PLATFORM_DEFAULT_MEM seems redundant. It makes little sense to use it in MMU configurations instead of KSEG_PADDR. In noMMU configurations there's no explicit KSEG, so it's still useful for the early cache initialization and definition of ARCH_PFN_OFFSET, which affects mem_map size. - limit it to noMMU; MMU variants have XCHAL_KSEG_PADDR and XCHAL_KSEG_SIZE; - don't use it to define TASK_SIZE or MAX_LOW_PFN: first doesn't make any difference in noMMU, second is meaningless as there's no high memory; - don't add default physical memory region: memory layout should come from the DT, bootloader tags, or memmap= command line parameter. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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