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2015-06-19ARC: entry.S: micro-optimize Trap handlerVineet Gupta
Elide the need to re-read ECR in Trap handler by ensuring that EXCEPTION_PROLOGUE does that at the very end just before returning to Trap handler ARCv2 EXCEPTION_PROLOGUE already did that, so same for ARcompact and the common trap handler adjusted to use cached ECR Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: move some code around for cache locality in return pathVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: split into ARCompact ISA specific, common bitsVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: Ensure that restore_regs is local to compilation unitVineet Gupta
This fixes the possible link/relo errors, since restore_regs will be provided by ISA code, but called from ARC common code. The .L prefix reassures binutils that it will be in same compilation unit. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: comments cleanupVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: Trap handler to use r10 for syscall vs. brkpt decisionVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: FAKE_RET_FROM_EXCPN can always use r9Vineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: confine EXCEPTION_* macros to one fileVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: canonical'ize EXCEPTION_{PROLOGUE,EPILOGUE}Vineet Gupta
-EXCEPTION_EPILOGUE introduced -EXCEPTION_PROLOGUE now also includes reg file saving Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: Introduce INTERRUPT_{PROLOGUE,EPILOGUE}Vineet Gupta
-common'ize macros for level 1 and level 2 interrupts Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: common'ize scrtach reg freeup in intr + exceptionsVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: untangle cache flush loopVineet Gupta
- Remove the ifdef'ery and write distinct versions for each mmu ver even if there is some code duplication Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: cacheflush: No need to retain DC_CTRL from __before_dc_op()Vineet Gupta
That is because __after_dc_op() already reads it for status check, so it is better anyways to use that "newer" value. Also reduces the clutter in callers for passing from/to these routines. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: cacheflush: move some code around, delete old commentsVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: mm/cache_arc700.c -> mm/cache.cVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [axs101] Add missing __init annotationsVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [axs101] STAR 9000799830: Fix SD cards supportAlexey Brodkin
As DW Mobile Storage databook says it's required to use "Hold Register" if card is enumerated in SDR12 or SDR25 modes. It means we need to act in the same way as in Altera's Socfpga implementation - set "use hold reg" bit in commad. Note that for upstream proper solution would be to remove dw_mci_pltfm_prepare_command() at all and set the bit right in dw_mci_prepare_command() for all platforms. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [axs101] Tweak DDR port aperture mappings for performanceVineet Gupta
Route all MB originated traffic to DDR Port 1 and keep Port 0 for CPU traffic only Basic system parameters -------------------------------------------------------------------------------------- Host OS Description Mhz tlb cache mem scal pages line par load bytes ----------------- ------------- --------------------------------------- ---- ----- ----- ------ ---- axs101-sd-2-new-f Linux 3.13.0+ axs101-sd-2-new-fw-old-img-rerun 739 8 32 1.1100 1 axs101-sd-3-arc-3 Linux 3.13.9+ axs101-sd-3-arc-3.13-tip-regression 735 8 32 1.1000 1 axs101-sd-9-diffe Linux 3.13.11 axs101-sd-9-different-tweak 740 8 32 1.0000 1 Processor, Processes - times in microseconds - smaller is better ------------------------------------------------------------------------------ Host OS Mhz null null open slct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- axs101-sd Linux 3.13.0+ 739 0.50 0.88 5.38 14.6 34.1 0.92 5.18 2135 6555 12.K axs101-sd Linux 3.13.9+ 735 0.50 0.90 5.89 19.2 81.4 0.94 4.08 2560 8559 15.K axs101-sd Linux 3.13.11 740 0.50 0.88 4.45 17.8 34.4 0.94 3.25 2052 6493 12.K ^^^^ ^^^^ Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [axs101] support early 8250 uartVineet Gupta
Earlycon calculates UART clock as "BASE_BAUD * 16". In case of ARC "BASE_BAUD" is calculated dynamically in runtime, basically it is an alias to arc_early_base_baud(), which in turn just does "arc_base_baud/16". 8250 UART on AXS/SDP board uses 33.3MHz clock source which is set in "arc_base_baud" with this change. Additional compatibility string "snps,arc-sdp" is introduced as well because there're different flavours of AXS boards but they all share the same motherboard and so it's possible to re-use the same code for motherbord even if CPU daughterboard changes. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [axs101] Add support for AXS101 SDP (software development platform)Alexey Brodkin
The AXS10x platforms consist of a mainboard with peripherals, on which several daughter cards can be placed. The daughter cards typically contain a CPU and memory. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: mm: document system mem map clearlyVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: stack unwinder to bail if PC is not kernel modeVineet Gupta
Currently, it doesn't invoke the callback but continues to unwind Also while at it - simplify the code a bit Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: perf: Remove unnecessary local variableTobias Klauser
Directly return the result of perf_pmu_register() in arc_pmu_device_probe() instead of assigning and returning variable ret. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19arc: fix use of uninitialized arc_pmuMax Filippov
static arc_pmu in the arch/arc/kernel/perf_event.c is not initialized as it's shadowed by a local variable of the same name in the arc_pmu_device_probe. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Fixes: 03c94fcf954d "ARC: perf: make @arc_pmu static global" CC: <stable@vger.kernel.org> # 4.1 Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: fix section mismatch with allyesconfigVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: explicit'ify uboot supportVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [plat_arcfpga]->[plat_sim]Vineet Gupta
* Remove remanants of legacy ARC FPGA platforms (AA4, ML509...) * Only nsim simulation platform is left, rename platform accordingly * AA4 DT stuff is compatible with nsim for ARC700 so rename it too Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [arcfpga] RIP legacy ISS based SMP extensionVineet Gupta
With ISS long unsupported, no point in having extension based on it Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: compress cpuinfo_arc_mmu (mainly save page size in KB)Vineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: clocksource cleanupsVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: RIP broken 64bit RTSCVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: [kbuild] Retire CONFIG_ARC_CPU_REL_4_10Vineet Gupta
Back when ARC700 4.10 was released, the related kernel features were tied to this config item so they could be disabled in one shot (i.e. LLOCK/SCOND, SWAPE, RTSC..) That having happened a while back, all new ARC customers weill get 4.11+ so those features can be assumed to be present and need not be tied to a top-level (we still retain the ability to individually disable them). Further, since ARCv2 also shares some of those feautes, removing it simplifies things a bit in Kconfig Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: remove the unused platform helpers from dma mapping APIVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-07arch/*/io.h: Add ioremap_wt() to all architecturesToshi Kani
Add ioremap_wt() to all arch-specific asm/io.h headers which define ioremap_wc() locally. These headers do not include <asm-generic/iomap.h>. Some of them include <asm-generic/io.h>, but ioremap_wt() is defined for consistency since they define all ioremap_xxx locally. In all architectures without Write-Through support, ioremap_wt() is defined indentical to ioremap_nocache(). frv and m68k already have ioremap_writethrough(). On those we add ioremap_wt() indetical to ioremap_writethrough() and defines ARCH_HAS_IOREMAP_WT in both architectures. The ioremap_wt() interface is exported to drivers. Signed-off-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Elliott@hp.com Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luis R. Rodriguez <mcgrof@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: arnd@arndb.de Cc: hch@lst.de Cc: hmh@hmh.eng.br Cc: jgross@suse.com Cc: konrad.wilk@oracle.com Cc: linux-mm <linux-mm@kvack.org> Cc: linux-nvdimm@lists.01.org Cc: stefan.bader@canonical.com Cc: yigal@plexistor.com Link: http://lkml.kernel.org/r/1433436928-31903-9-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19remove scatterlist.h generation from arch Kbuild filesChristoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Jens Axboe <axboe@fb.com>
2015-05-19sched/preempt, futex: Update comments to clarify that preemption doesn't ↵David Hildenbrand
have to be disabled As arm64 and arc have no special implementations for !CONFIG_SMP, mutual exclusion doesn't seem to rely on preemption. Let's make it clear in the comments that preemption doesn't have to be disabled when accessing user space in the futex code, so we can remove preempt_disable() from pagefault_disable(). 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/1431359540-32227-13-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in ↵David Hildenbrand
the handler Introduce faulthandler_disabled() and use it to check for irq context and disabled pagefaults (via pagefault_disable()) in the pagefault handlers. Please note that we keep the in_atomic() checks in place - to detect whether in irq context (in which case preemption is always properly disabled). In contrast, preempt_disable() should never be used to disable pagefaults. With !CONFIG_PREEMPT_COUNT, preempt_disable() doesn't modify the preempt counter, and therefore the result of in_atomic() differs. We validate that condition by using might_fault() checks when calling might_sleep(). Therefore, add a comment to faulthandler_disabled(), describing why this is needed. faulthandler_disabled() and pagefault_disable() are defined in linux/uaccess.h, so let's properly add that include to all relevant files. This patch is based on a patch from Thomas Gleixner. 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/1431359540-32227-7-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19ARC: switch to simpler CROSS_COMPILE prefixVineet Gupta
ARC GNU tools have had support for arc-linux-* driver for some time now. This is functionally similar to arc-linux-uclibc-* but uclibc prefix seemed weird at best when trying to compile the kernel itself. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-05-19ARC: fold ___flush_dcache_page into __flush_dcache_pageVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-05-19ARC: fix warning in sched due to thread_saved_pc()Vineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-05-11ARC: inline cache flush toggle helpersVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-05-11ARC: With earlycon in use, retire EARLY_PRINTKVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-05-10ARC: unbork !LLSC buildVineet Gupta
Fixes: f7d11e93ee97a locking,arch,arc: Fold atomic_ops Cc: <stable@kernel.vger.org> # 3.18 Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-04-24Merge tag 'arc-4.1-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC updates from Vineet Gupta: - perf fixes/improvements - misc cleanups * tag 'arc-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: perf: don't add code for impossible case ARC: perf: Rename DT binding to not confuse with power mgmt ARC: perf: add user space attribution in callchains ARC: perf: Add kernel callchain support ARC: perf: support cache hit/miss ratio ARC: perf: Add some comments/debug stuff ARC: perf: make @arc_pmu static global ARC: mem init spring cleaning - No functional changes ARC: Fix RTT boot printing ARC: fold __builtin_constant_p() into test_bit() ARC: rename unhandled exception handler ARC: cosmetic: Remove unused ECR bitfield masks ARC: Fix WRITE_BCR ARC: [nsimosci] Update defconfig arc: copy_thread(): rename 'arg' argument to 'kthread_arg'
2015-04-20ARC: perf: don't add code for impossible caseVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-04-20ARC: perf: Rename DT binding to not confuse with power mgmtVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-04-20ARC: perf: add user space attribution in callchainsVineet Gupta
The actual user space unwinding is more involved, so simply capture the user space PC Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-04-20ARC: perf: Add kernel callchain supportVineet Gupta
Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-04-20ARC: perf: support cache hit/miss ratioVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-04-20ARC: perf: Add some comments/debug stuffVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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