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2020-05-13csky: Fixup msa highest 3 bits maskLiu Yibin2-4/+4
Just as comment mentioned, the msa format: cr<30/31, 15> MSA register format: 31 - 29 | 28 - 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 BA Reserved SH WA B SO SEC C D V So we should shift 29 bits not 28 bits for mask Signed-off-by: Liu Yibin <jiulong@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-13csky: Fixup perf probe -x hungupGuo Ren2-0/+11
case: # perf probe -x /lib/libc-2.28.9000.so memcpy # perf record -e probe_libc:memcpy -aR sleep 1 System hangup and cpu get in trap_c loop, because our hardware singlestep state could still get interrupt signal. When we get in uprobe_xol singlestep slot, we should disable irq in pt_regs->psr. And is_swbp_insn() need a csky arch implementation with a low 16bit mask. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-05-13csky: Fixup compile error for abiv1 entry.SGuo Ren1-4/+4
This bug is from uprobe signal definition in thread_info.h. The instruction (andi) of abiv1 immediate is smaller than abiv2, then it will cause: AS arch/csky/kernel/entry.o arch/csky/kernel/entry.S: Assembler messages: arch/csky/kernel/entry.S:224: Error: Operand 2 immediate is overflow. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-13csky/ftrace: Fixup error when disable CONFIG_DYNAMIC_FTRACEGuo Ren2-0/+4
When CONFIG_DYNAMIC_FTRACE is enabled, static ftrace will fail to boot up and compile. It's a carelessness when developing "dynamic ftrace" and "ftrace with regs". Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-04-10mm/special: create generic fallbacks for pte_special() and pte_mkspecial()Anshuman Khandual1-3/+0
Currently there are many platforms that dont enable ARCH_HAS_PTE_SPECIAL but required to define quite similar fallback stubs for special page table entry helpers such as pte_special() and pte_mkspecial(), as they get build in generic MM without a config check. This creates two generic fallback stub definitions for these helpers, eliminating much code duplication. mips platform has a special case where pte_special() and pte_mkspecial() visibility is wider than what ARCH_HAS_PTE_SPECIAL enablement requires. This restricts those symbol visibility in order to avoid redefinitions which is now exposed through this new generic stubs and subsequent build failure. arm platform set_pte_at() definition needs to be moved into a C file just to prevent a build failure. [anshuman.khandual@arm.com: use defined(CONFIG_ARCH_HAS_PTE_SPECIAL) in mips per Thomas] Link: http://lkml.kernel.org/r/1583851924-21603-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Guo Ren <guoren@kernel.org> [csky] Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Stafford Horne <shorne@gmail.com> [openrisc] Acked-by: Helge Deller <deller@gmx.de> [parisc] Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Brian Cain <bcain@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Sam Creasey <sammy@sammy.net> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paulburton@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Greentime Hu <green.hu@gmail.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Link: http://lkml.kernel.org/r/1583802551-15406-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-10mm/vma: define a default value for VM_DATA_DEFAULT_FLAGSAnshuman Khandual1-3/+0
There are many platforms with exact same value for VM_DATA_DEFAULT_FLAGS This creates a default value for VM_DATA_DEFAULT_FLAGS in line with the existing VM_STACK_DEFAULT_FLAGS. While here, also define some more macros with standard VMA access flag combinations that are used frequently across many platforms. Apart from simplification, this reduces code duplication as well. Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Salter <msalter@redhat.com> Cc: Guo Ren <guoren@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Brian Cain <bcain@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paulburton@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Rich Felker <dalias@libc.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Chris Zankel <chris@zankel.net> Link: http://lkml.kernel.org/r/1583391014-8170-2-git-send-email-anshuman.khandual@arm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-07mm/vma: append unlikely() while testing VMA access permissionsAnshuman Khandual1-1/+1
It is unlikely that an inaccessible VMA without required permission flags will get a page fault. Hence lets just append unlikely() directive to such checks in order to improve performance while also standardizing it across various platforms. Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Guo Ren <guoren@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paulburton@kernel.org> Cc: Mike Rapoport <rppt@linux.ibm.com> Link: http://lkml.kernel.org/r/1582525304-32113-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-07mm/vma: make vma_is_accessible() available for general useAnshuman Khandual1-1/+1
Lets move vma_is_accessible() helper to include/linux/mm.h which makes it available for general use. While here, this replaces all remaining open encodings for VMA access check with vma_is_accessible(). Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Guo Ren <guoren@kernel.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Guo Ren <guoren@kernel.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paulburton@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Nick Piggin <npiggin@gmail.com> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Will Deacon <will@kernel.org> Link: http://lkml.kernel.org/r/1582520593-30704-3-git-send-email-anshuman.khandual@arm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-06Merge tag 'csky-for-linus-5.7-rc1' of git://github.com/c-sky/csky-linuxLinus Torvalds34-74/+1807
Pull csky updates from Guo Ren: - Add kproobes/uprobes support - Add lockdep, rseq, gcov support - Fixup init_fpu - Fixup ftrace_modify deadlock - Fixup speculative execution on IO area * tag 'csky-for-linus-5.7-rc1' of git://github.com/c-sky/csky-linux: csky: Fixup cpu speculative execution to IO area csky: Add uprobes support csky: Add kprobes supported csky: Enable LOCKDEP_SUPPORT csky: Enable the gcov function csky: Fixup get wrong psr value from phyical reg csky/ftrace: Fixup ftrace_modify_code deadlock without CPU_HAS_ICACHE_INS csky: Implement ftrace with regs csky: Add support for restartable sequence csky: Implement ptrace regs and stack API csky: Fixup init_fpu compile warning with __init
2020-04-03csky: Fixup cpu speculative execution to IO areaGuo Ren5-58/+25
For the memory size ( > 512MB, < 1GB), the MSA setting is: - SSEG0: PHY_START , PHY_START + 512MB - SSEG1: PHY_START + 512MB, PHY_START + 1GB But the real memory is no more than 1GB, there is a gap between the end size of memory and border of 1GB. CPU could speculatively execute to that gap and if the gap of the bus couldn't respond to the CPU request, then the crash will happen. Now make the setting with: - SSEG0: PHY_START , PHY_START + 512MB (no change) - SSEG1: Disabled (We use highmem to use the memory of 512MB~1GB) We also deprecated zhole_szie[] settings, it's only used by arm style CPUs. All memory gap should use Reserved setting of dts in csky system. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-04-03csky: Add uprobes supportGuo Ren8-1/+201
This patch adds support for uprobes on csky architecture. Just like kprobe, it support single-step and simulate instructions. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-04-03csky: Add kprobes supportedGuo Ren16-2/+1197
This patch enable kprobes, kretprobes, ftrace interface. It utilized software breakpoint and single step debug exceptions, instructions simulation on csky. We use USR_BKPT replace origin instruction, and the kprobe handler prepares an excutable memory slot for out-of-line execution with a copy of the original instruction being probed. Most of instructions could be executed by single-step, but some instructions need origin pc value to execute and we need software simulate these instructions. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-04-02asm-generic: make more kernel-space headers mandatoryMasahiro Yamada1-36/+0
Change a header to mandatory-y if both of the following are met: [1] At least one architecture (except um) specifies it as generic-y in arch/*/include/asm/Kbuild [2] Every architecture (except um) either has its own implementation (arch/*/include/asm/*.h) or specifies it as generic-y in arch/*/include/asm/Kbuild This commit was generated by the following shell script. ----------------------------------->8----------------------------------- arches=$(cd arch; ls -1 | sed -e '/Kconfig/d' -e '/um/d') tmpfile=$(mktemp) grep "^mandatory-y +=" include/asm-generic/Kbuild > $tmpfile find arch -path 'arch/*/include/asm/Kbuild' | xargs sed -n 's/^generic-y += \(.*\)/\1/p' | sort -u | while read header do mandatory=yes for arch in $arches do if ! grep -q "generic-y += $header" arch/$arch/include/asm/Kbuild && ! [ -f arch/$arch/include/asm/$header ]; then mandatory=no break fi done if [ "$mandatory" = yes ]; then echo "mandatory-y += $header" >> $tmpfile for arch in $arches do sed -i "/generic-y += $header/d" arch/$arch/include/asm/Kbuild done fi done sed -i '/^mandatory-y +=/d' include/asm-generic/Kbuild LANG=C sort $tmpfile >> include/asm-generic/Kbuild ----------------------------------->8----------------------------------- One obvious benefit is the diff stat: 25 files changed, 52 insertions(+), 557 deletions(-) It is tedious to list generic-y for each arch that needs it. So, mandatory-y works like a fallback default (by just wrapping asm-generic one) when arch does not have a specific header implementation. See the following commits: def3f7cefe4e81c296090e1722a76551142c227c a1b39bae16a62ce4aae02d958224f19316d98b24 It is tedious to convert headers one by one, so I processed by a shell script. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Simek <michal.simek@xilinx.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Arnd Bergmann <arnd@arndb.de> Link: http://lkml.kernel.org/r/20200210175452.5030-1-masahiroy@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-02csky: Enable LOCKDEP_SUPPORTGuo Ren2-0/+14
Lockdep is needed by proving the spinlocks and rwlocks. Currently, we only put trace_hardirqs_on/off with csky_irq and ret_from_exception. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-04-01csky: Enable the gcov functionMa Jun1-0/+1
Support the gcov function in csky architecture. Signed-off-by: Ma Jun <majun258@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
2020-04-01csky: Fixup get wrong psr value from phyical regGuo Ren3-1/+18
We should get psr value from regs->psr in stack, not directly get it from phyiscal register then save the vector number in tsk->trap_no. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-03-31csky/ftrace: Fixup ftrace_modify_code deadlock without CPU_HAS_ICACHE_INSGuo Ren2-6/+70
If ICACHE_INS is not supported, we use IPI to sync icache on each core. But ftrace_modify_code is called from stop_machine from default implementation of arch_ftrace_update_code and stop_machine callback is irq_disabled. When you call ipi with irq_disabled, a deadlock will happen. We couldn't use icache_flush with irq_disabled, but startup make_nop is specific case and it needn't ipi other cores. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-03-21csky: Remove mm.h from asm/uaccess.hSebastian Andrzej Siewior1-1/+0
The defconfig compiles without linux/mm.h. With mm.h included the include chain leands to: | CC kernel/locking/percpu-rwsem.o | In file included from include/linux/huge_mm.h:8, | from include/linux/mm.h:567, | from arch/csky/include/asm/uaccess.h:, | from include/linux/uaccess.h:11, | from include/linux/sched/task.h:11, | from include/linux/sched/signal.h:9, | from include/linux/rcuwait.h:6, | from include/linux/percpu-rwsem.h:8, | from kernel/locking/percpu-rwsem.c:6: | include/linux/fs.h:1422:29: error: array type has incomplete element type 'struct percpu_rw_semaphore' | 1422 | struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; once rcuwait.h includes linux/sched/signal.h. Remove the linux/mm.h include. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200321113241.434999165@linutronix.de
2020-03-08csky: Implement ftrace with regsGuo Ren6-0/+123
This patch implements FTRACE_WITH_REGS for csky, which allows a traced function's arguments (and some other registers) to be captured into a struct pt_regs, allowing these to be inspected and/or modified. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-03-08csky: Add support for restartable sequenceGuo Ren3-1/+8
Copied and adapted from vincent's patch, but modified for csky. ref: https://lore.kernel.org/linux-riscv/1572919114-3886-3-git-send-email-vincent.chen@sifive.com/raw Add calls to rseq_signal_deliver(), rseq_handle_notify_resume() and rseq_syscall() to introduce RSEQ support. 1. Call the rseq_handle_notify_resume() function on return to userspace if TIF_NOTIFY_RESUME thread flag is set. 2. Call the rseq_signal_deliver() function to fixup on the pre-signal frame when a signal is delivered on top of a restartable sequence critical section. 3. Check that system calls are not invoked from within rseq critical sections by invoking rseq_signal() from ret_from_syscall(). With CONFIG_DEBUG_RSEQ, such behavior results in termination of the process with SIGSEGV. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-03-08csky: Implement ptrace regs and stack APIGuo Ren3-0/+145
Needed for kprobes support. Copied and adapted from Patrick's patch, but it has been modified for csky's pt_regs. ref: https://lore.kernel.org/linux-riscv/1572919114-3886-2-git-send-email-vincent.chen@sifive.com/raw Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Patrick Staehlin <me@packi.ch>
2020-03-08csky: Fixup init_fpu compile warning with __initGuo Ren3-6/+5
WARNING: vmlinux.o(.text+0x2366): Section mismatch in reference from the function csky_start_secondary() to the function .init.text:init_fpu() The function csky_start_secondary() references the function __init init_fpu(). This is often because csky_start_secondary lacks a __init annotation or the annotation of init_fpu is wrong. Reported-by: Lu Chongzhi <chongzhi.lcz@alibaba-inc.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-23csky: Replace <linux/clk-provider.h> by <linux/of_clk.h>Geert Uytterhoeven1-1/+1
The C-Sky platform code is not a clock provider, and just needs to call of_clk_init(). Hence it can include <linux/of_clk.h> instead of <linux/clk-provider.h>. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Implement copy_thread_tlsGuo Ren2-3/+5
This is required for clone3 which passes the TLS value through a struct rather than a register. Cc: Amanieu d'Antras <amanieu@gmail.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Add PCI supportMaJun3-1/+39
Add the pci related code for csky arch to support basic pci virtual function, such as qemu virt-pci-9pfs. Signed-off-by: MaJun <majun258@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Minimize defconfig to support buildroot config.fragmentMa Jun1-7/+0
Some bsp (eg: buildroot) has defconfig.fragment design to add more configs into the defconfig in linux source code tree. For example, we could put different cpu configs into different defconfig.fragments, but they all use the same defconfig in Linux. Signed-off-by: Ma Jun <majun258@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Add setup_initrd check codeGuo Ren2-3/+44
We should give some necessary check for initrd just like other architectures and it seems that setup_initrd() could be a common code for all architectures. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Cleanup old Kconfig optionsKrzysztof Kozlowski2-3/+0
CONFIG_CLKSRC_OF is gone since commit bb0eb050a577 ("clocksource/drivers: Rename CLKSRC_OF to TIMER_OF"). The platform already selects TIMER_OF. CONFIG_HAVE_DMA_API_DEBUG is gone since commit 6e88628d03dd ("dma-debug: remove CONFIG_HAVE_DMA_API_DEBUG"). CONFIG_DEFAULT_DEADLINE is gone since commit f382fb0bcef4 ("block: remove legacy IO schedulers"). Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21arch/csky: fix some Kconfig typosRandy Dunlap1-1/+1
Fix wording in help text for the CPU_HAS_LDSTEX symbol. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Guo Ren <guoren@kernel.org> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Fixup compile warning for three unimplemented syscallsGuo Ren1-0/+3
Implement fstat64, fstatat64, clone3 syscalls to fixup checksyscalls.sh compile warnings. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Remove unused cache implementationGuo Ren1-15/+1
Only for coding convention, these codes are unnecessary for abiv2. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Fixup ftrace modify panicGuo Ren1-0/+2
During ftrace init, linux will replace all function prologues (call_mcout) with nops, but it need flush_dcache and invalidate_icache to make it work. So flush_cache functions couldn't be nested called by ftrace framework. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Add flush_icache_mm to defer flush icache allGuo Ren7-11/+77
Some CPUs don't support icache.va instruction to maintain the whole smp cores' icache. Using icache.all + IPI casue a lot on performace and using defer mechanism could reduce the number of calling icache _flush_all functions. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Optimize abiv2 copy_to_user_page with VM_EXECGuo Ren1-1/+3
Only when vma is for VM_EXEC, we need sync dcache & icache. eg: - gdb ptrace modify user space instruction code area. Add VM_EXEC condition to reduce unnecessary cache flush. The abiv1 cpus' cache are all VIPT, so we still need to deal with dcache aliasing problem. But there is optimized way to use cache color, just like what's done in arch/csky/abiv1/inc/abi/page.h. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Enable defer flush_dcache_page for abiv2 cpus (807/810/860)Guo Ren2-8/+18
Instead of flushing cache per update_mmu_cache() called, we use flush_dcache_page to reduce the frequency of flashing the cache. As abiv2 cpus are all PIPT for icache & dcache, we needn't handle dcache aliasing problem. But their icache can't snoop dcache, so we still need sync_icache_dcache in update_mmu_cache(). Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Remove unnecessary flush_icache_* implementationGuo Ren3-37/+2
The abiv2 CPUs are all PIPT cache, so there is no need to implement flush_icache_page function. The function flush_icache_user_range hasn't been used, so just remove it. The function flush_cache_range is not necessary for PIPT cache when tlb mapping changed. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Support icache flush without specific instructionsGuo Ren4-8/+31
Some CPUs don't support icache specific instructions to flush icache lines in broadcast way. We use cpu control registers to flush local icache and use IPI to notify other cores. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky/Kconfig: Add Kconfig.platforms to support some driversGuo Ren2-0/+11
Such as snps,dw-apb-ictl Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky/smp: Fixup boot failed when CONFIG_SMPGuo Ren1-1/+1
If we use a non-ipi-support interrupt controller, it will cause panic here. We should let cpu up and work with CONFIG_SMP, when we use a non-ipi intc. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Set regs->usp to kernel sp, when the exception is from kernelGuo Ren3-7/+31
In the past, we didn't care about kernel sp when saving pt_reg. But in some cases, we still need pt_reg->usp to represent the kernel stack before enter exception. For cmpxhg in atomic.S, we need save and restore usp for above. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky/mm: Fixup export invalid_pte_table symbolGuo Ren1-0/+1
There is no present bit in csky pmd hardware, so we need to prepare invalid_pte_table for empty pmd entry and the functions (pmd_none & pmd_present) in pgtable.h need invalid_pte_talbe to get result. If a module use these functions, we need export the symbol for it. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Mo Qihui <qihui.mo@verisilicon.com> Cc: Zhange Jian <zhang_jian5@dahuatech.com>
2020-02-21csky: Separate fixaddr_init from highmemGuo Ren7-66/+61
After fixaddr_init is separated from highmem, we could use tcm without highmem selected. (610 (abiv1) don't support highmem, but it could use tcm now.) Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Tightly-Coupled Memory or Sram supportGuo Ren7-1/+304
The implementation are not only used by TCM but also used by sram on SOC bus. It follow existed linux tcm software interface, so that old tcm application codes could be re-used directly. Software interface list in asm/tcm.h: - Variables/Const: __tcmdata, __tcmconst - Functions: __tcmfunc, __tcmlocalfunc - Malloc/Free: tcm_alloc, tcm_free In linux menuconfig: - Choose a TCM contain instrctions + data or separated in ITCM/DTCM. - Determine TCM_BASE (DTCM_BASE) in phyiscal address. - Determine size of TCM or ITCM(DTCM) in page counts. Here is hello tcm example from Documentation/arm/tcm.rst which could be directly used: /* Uninitialized data */ static u32 __tcmdata tcmvar; /* Initialized data */ static u32 __tcmdata tcmassigned = 0x2BADBABEU; /* Constant */ static const u32 __tcmconst tcmconst = 0xCAFEBABEU; static void __tcmlocalfunc tcm_to_tcm(void) { int i; for (i = 0; i < 100; i++) tcmvar ++; } static void __tcmfunc hello_tcm(void) { /* Some abstract code that runs in ITCM */ int i; for (i = 0; i < 100; i++) { tcmvar ++; } tcm_to_tcm(); } static void __init test_tcm(void) { u32 *tcmem; int i; hello_tcm(); printk("Hello TCM executed from ITCM RAM\n"); printk("TCM variable from testrun: %u @ %p\n", tcmvar, &tcmvar); tcmvar = 0xDEADBEEFU; printk("TCM variable: 0x%x @ %p\n", tcmvar, &tcmvar); printk("TCM assigned variable: 0x%x @ %p\n", tcmassigned, &tcmassigned); printk("TCM constant: 0x%x @ %p\n", tcmconst, &tcmconst); /* Allocate some TCM memory from the pool */ tcmem = tcm_alloc(20); if (tcmem) { printk("TCM Allocated 20 bytes of TCM @ %p\n", tcmem); tcmem[0] = 0xDEADBEEFU; tcmem[1] = 0x2BADBABEU; tcmem[2] = 0xCAFEBABEU; tcmem[3] = 0xDEADBEEFU; tcmem[4] = 0x2BADBABEU; for (i = 0; i < 5; i++) printk("TCM tcmem[%d] = %08x\n", i, tcmem[i]); tcm_free(tcmem, 20); } } TODO: - Separate fixup mapping from highmem - Support abiv1 Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-21csky: Initial stack protector supportMao Han3-0/+36
This is a basic -fstack-protector support without per-task canary switching. The protector will report something like when stack corruption is detected: It's tested with strcpy local array overflow in sys_kill and get: stack-protector: Kernel stack is corrupted in: sys_kill+0x23c/0x23c TODO: - Support task switch for different cannary Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-02-04Merge tag 'microblaze-v5.6-rc1' of git://git.monstr.eu/linux-2.6-microblazeLinus Torvalds1-1/+0
Pull Microblaze update from Michal Simek: - enable CMA - add support for MB v11 - defconfig updates - minor fixes * tag 'microblaze-v5.6-rc1' of git://git.monstr.eu/linux-2.6-microblaze: microblaze: Add ID for Microblaze v11 microblaze: Prevent the overflow of the start microblaze: Wire CMA allocator asm-generic: Make dma-contiguous.h a mandatory include/asm header microblaze: Sync defconfig with latest Kconfig layout microblaze: defconfig: Disable EXT2 driver and Enable EXT3 & EXT4 drivers microblaze: Align comments with register usage
2020-02-04asm-generic: Make dma-contiguous.h a mandatory include/asm headerMichal Simek1-1/+0
dma-continuguous.h is generic for all architectures except arm32 which has its own version. Similar change was done for msi.h by commit a1b39bae16a6 ("asm-generic: Make msi.h a mandatory include/asm header") Suggested-by: Christoph Hellwig <hch@infradead.org> Link: https://lore.kernel.org/linux-arm-kernel/20200117080446.GA8980@lst.de/T/#m92bb56b04161057635d4142e1b3b9b6b0a70122e Signed-off-by: Michal Simek <michal.simek@xilinx.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Paul Walmsley <paul.walmsley@sifive.com> # for arch/riscv
2020-01-29Merge tag 'tty-5.6-rc1' of ↵Linus Torvalds1-4/+0
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull tty/serial driver updates from Greg KH: "Here are the big set of tty and serial driver updates for 5.6-rc1 Included in here are: - dummy_con cleanups (touches lots of arch code) - sysrq logic cleanups (touches lots of serial drivers) - samsung driver fixes (wasn't really being built) - conmakeshash move to tty subdir out of scripts - lots of small tty/serial driver updates All of these have been in linux-next for a while with no reported issues" * tag 'tty-5.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (140 commits) tty: n_hdlc: Use flexible-array member and struct_size() helper tty: baudrate: SPARC supports few more baud rates tty: baudrate: Synchronise baud_table[] and baud_bits[] tty: serial: meson_uart: Add support for kernel debugger serial: imx: fix a race condition in receive path serial: 8250_bcm2835aux: Document struct bcm2835aux_data serial: 8250_bcm2835aux: Use generic remapping code serial: 8250_bcm2835aux: Allocate uart_8250_port on stack serial: 8250_bcm2835aux: Suppress register_port error on -EPROBE_DEFER serial: 8250_bcm2835aux: Suppress clk_get error on -EPROBE_DEFER serial: 8250_bcm2835aux: Fix line mismatch on driver unbind serial_core: Remove unused member in uart_port vt: Correct comment documenting do_take_over_console() vt: Delete comment referencing non-existent unbind_con_driver() arch/xtensa/setup: Drop dummy_con initialization arch/x86/setup: Drop dummy_con initialization arch/unicore32/setup: Drop dummy_con initialization arch/sparc/setup: Drop dummy_con initialization arch/sh/setup: Drop dummy_con initialization arch/s390/setup: Drop dummy_con initialization ...
2020-01-28Merge branch 'sched-core-for-linus' of ↵Linus Torvalds1-2/+2
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler updates from Ingo Molnar: "These were the main changes in this cycle: - More -rt motivated separation of CONFIG_PREEMPT and CONFIG_PREEMPTION. - Add more low level scheduling topology sanity checks and warnings to filter out nonsensical topologies that break scheduling. - Extend uclamp constraints to influence wakeup CPU placement - Make the RT scheduler more aware of asymmetric topologies and CPU capacities, via uclamp metrics, if CONFIG_UCLAMP_TASK=y - Make idle CPU selection more consistent - Various fixes, smaller cleanups, updates and enhancements - please see the git log for details" * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (58 commits) sched/fair: Define sched_idle_cpu() only for SMP configurations sched/topology: Assert non-NUMA topology masks don't (partially) overlap idle: fix spelling mistake "iterrupts" -> "interrupts" sched/fair: Remove redundant call to cpufreq_update_util() sched/psi: create /proc/pressure and /proc/pressure/{io|memory|cpu} only when psi enabled sched/fair: Fix sgc->{min,max}_capacity calculation for SD_OVERLAP sched/fair: calculate delta runnable load only when it's needed sched/cputime: move rq parameter in irqtime_account_process_tick stop_machine: Make stop_cpus() static sched/debug: Reset watchdog on all CPUs while processing sysrq-t sched/core: Fix size of rq::uclamp initialization sched/uclamp: Fix a bug in propagating uclamp value in new cgroups sched/fair: Load balance aggressively for SCHED_IDLE CPUs sched/fair : Improve update_sd_pick_busiest for spare capacity case watchdog: Remove soft_lockup_hrtimer_cnt and related code sched/rt: Make RT capacity-aware sched/fair: Make EAS wakeup placement consider uclamp restrictions sched/fair: Make task_fits_capacity() consider uclamp restrictions sched/uclamp: Rename uclamp_util_with() into uclamp_rq_util_with() sched/uclamp: Make uclamp util helpers use and return UL values ...
2020-01-14arch/csky/setup: Drop dummy_con initializationArvind Sankar1-4/+0
con_init in tty/vt.c will now set conswitchp to dummy_con if it's unset. Drop it from arch setup code. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Link: https://lore.kernel.org/r/20191218214506.49252-9-nivedita@alum.mit.edu Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-10mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from ↵Ingo Molnar1-0/+4
<linux/vmalloc.h> In the x86 MM code we'd like to untangle various types of historic header dependency spaghetti, but for this we'd need to pass to the generic vmalloc code various vmalloc related defines that customarily come via the <asm/page.h> low level arch header. Signed-off-by: Ingo Molnar <mingo@kernel.org>
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