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2015-06-22ARCv2: MMUv4: cache programming model changesVineet Gupta
Caveats about cache flush on ARCv2 based cores - dcache is PIPT so paddr is sufficient for cache maintenance ops (no need to setup PTAG reg - icache is still VIPT but only aliasing configs need PTAG setup So basically this is departure from MMU-v3 which always need vaddr in line ops registers (DC_IVDL, DC_FLDL, IC_IVIL) but paddr in DC_PTAG, IC_PTAG respectively. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: MMUv4: TLB programming Model changesVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: STAR 9000814690: Really Re-enable interrupts to avoid deadlocksVineet Gupta
The issue was, on HS when interrupt is taken, IRQ_ACT is set and that is NOT cleared unless we do RTIE (or manually clear it). Linux interrupt handling has top and bottom halves. Latter lead to softirqs (which can reschedule) AND expect interrupts to be REALLY re-enabled which was NOT happening for us since we only SETI, dont clear IRQ_ACT So we can have a state when both cores have taken interrupt (IRQ_ACT set), get rescheduled, both send IPI and wait in CSD lock which will never be cleared as cores can't take the pending IPI IRQ due to existing IRQ_ACT set. So local_irq_enable() now drops the IRQ_ACT.act bit to re-enable IRQs. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: STAR 9000808988: signals involving Delay SlotVineet Gupta
Reported by Anton as LTP:munmap01 failing with Illegal Instruction Exception. --------------------->8-------------------------------------- mmap2(NULL, 24576, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0x200d2000 munmap(0x200d2000, 24576) = 0 --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x200d2000} --- potentially unexpected fatal signal 4. Path: /munmap01 CPU: 0 PID: 61 Comm: munmap01 Not tainted 3.13.0-g5d5c46d9a556 #8 task: 9f1a8000 ti: 9f154000 task.ti: 9f154000 [ECR ]: 0x00020100 => Illegal Insn [EFA ]: 0x0001354c [BLINK ]: 0x200515d4 [ERET ]: 0x1354c @off 0x1354c in [/munmap01] VMA: 0x00010000 to 0x00018000 [STAT32]: 0x800802c0 ... --------------------->8-------------------------------------- The issue was 1. munmap01 accessed unmapped memory (on purpose) with signal handler installed for SIGSEGV 2. The faulting instruction happened to be in Delay Slot 00011864 <main>: 11908: bl.d 13284 <tst_resm> 1190c: stb r16,[r2] 3. kernel sets up the reg file for signal handler and correctly clears the DE bit in pt_regs->status32 placeholder 4. However RESTORE_CALLEE_SAVED_USER macro is not adjusted for ARCv2, and it over-writes the above with orig/stale value of status32 5. After RTIE, userspace signal handler executes a non branch instruction with DE bit set, triggering Illegal Instruction Exception. Reported-by: Anton Kolesov <akolesov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: STAR 9000793984: Handle return from intr to Delay SlotVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: Support for ARCv2 ISA and HS38x coresVineet Gupta
The notable features are: - SMP configurations of upto 4 cores with coherency - Optional L2 Cache and IO-Coherency - Revised Interrupt Architecture (multiple priorites, reg banks, auto stack switch, auto regfile save/restore) - MMUv4 (PIPT dcache, Huge Pages) - Instructions for * 64bit load/store: LDD, STD * Hardware assisted divide/remainder: DIV, REM * Function prologue/epilogue: ENTER_S, LEAVE_S * IRQ enable/disable: CLRI, SETI * pop count: FFS, FLS * SETcc, BMSKN, XBFU... Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARCv2: [intc] HS38 core interrupt controllerVineet Gupta
Cc: Jason Cooper <jason@lakedaemon.net> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-22ARC: uncached base is hard constant for ARC, don't save itVineet Gupta
ioremap already uses the hard define, just make sure BCR value matches that Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: intc: split into ARCompact ISA specific, common bitsVineet Gupta
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: Make way for pt_regs != user_regs_structVineet Gupta
These have been register compatible so far. However ARCv2 mandates different pt_regs layout (due to h/w auto save). To keep pt_regs same for both, we start by removing the assumption - used mainly for block copies between the 2 structs in signal handling and ptrace Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: [arcompact] simplify SWITCH_TO_KERNEL_STKVineet Gupta
Previously this macro was overloaded with stack switching, saving SP at right slot in pt_regs, saving/setup of r25 and setting SP baseline to where pt_regs->sp is saved (vs. bottom of pt_regs) Now it only does SP switch, and leaves SP pointing to bottom of pt_regs. r25 saving is no longer done here to allow for future reordering of regfile in pt_regs w/o touching this macro Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-06-19ARC: entry.S: use single EXCEPTION_PROLOGUEVineet Gupta
Returning from pure kernel mode and exception mode use the same code anyways. Remove one the duplicate blocks Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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>
2015-05-19ARC: 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>
2015-05-16Merge branch 'master' of git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds
Pull MIPS fixes from Ralf Baechle: "Seven small fixes. The shortlog below is a good description so no need to elaborate. It has sat in linux-next and survived the usual automated testing by Imagination's test farm" * 'master' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: MIPS: tlb-r4k: Fix PG_ELPA comment MIPS: Fix up obsolete cpu_set usage MIPS: IP32: Fix build errors in reset code in DS1685 platform hook. MIPS: KVM: Fix unused variable build warning MIPS: traps: remove extra Tainted: line from __show_regs() output MIPS: Fix wrong CHECKFLAGS (sparse builds) with GCC 5.1 MIPS: Fix a preemption issue with thread's FPU defaults
2015-05-16Merge tag 'arc-4.1-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc Pull ARC fixes from Vineet Gupta. * tag 'arc-4.1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: inline cache flush toggle helpers ARC: With earlycon in use, retire EARLY_PRINTK ARC: unbork !LLSC build
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