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2020-06-09mmap locking API: use coccinelle to convert mmap_sem rwsem call sitesMichel Lespinasse
This change converts the existing mmap_sem rwsem calls to use the new mmap locking API instead. The change is generated using coccinelle with the following rule: // spatch --sp-file mmap_lock_api.cocci --in-place --include-headers --dir . @@ expression mm; @@ ( -init_rwsem +mmap_init_lock | -down_write +mmap_write_lock | -down_write_killable +mmap_write_lock_killable | -down_write_trylock +mmap_write_trylock | -up_write +mmap_write_unlock | -downgrade_write +mmap_write_downgrade | -down_read +mmap_read_lock | -down_read_killable +mmap_read_lock_killable | -down_read_trylock +mmap_read_trylock | -up_read +mmap_read_unlock ) -(&mm->mmap_sem) +(mm) Signed-off-by: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Liam Howlett <Liam.Howlett@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ying Han <yinghan@google.com> Link: http://lkml.kernel.org/r/20200520052908.204642-5-walken@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09mm: don't include asm/pgtable.h if linux/mm.h is already includedMike Rapoport
Patch series "mm: consolidate definitions of page table accessors", v2. The low level page table accessors (pXY_index(), pXY_offset()) are duplicated across all architectures and sometimes more than once. For instance, we have 31 definition of pgd_offset() for 25 supported architectures. Most of these definitions are actually identical and typically it boils down to, e.g. static inline unsigned long pmd_index(unsigned long address) { return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); } static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) { return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } These definitions can be shared among 90% of the arches provided XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined. For architectures that really need a custom version there is always possibility to override the generic version with the usual ifdefs magic. These patches introduce include/linux/pgtable.h that replaces include/asm-generic/pgtable.h and add the definitions of the page table accessors to the new header. This patch (of 12): The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the functions involving page table manipulations, e.g. pte_alloc() and pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h> in the files that include <linux/mm.h>. The include statements in such cases are remove with a simple loop: for f in $(git grep -l "include <linux/mm.h>") ; do sed -i -e '/include <asm\/pgtable.h>/ d' $f done Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09kernel: rename show_stack_loglvl() => show_stack()Dmitry Safonov
Now the last users of show_stack() got converted to use an explicit log level, show_stack_loglvl() can drop it's redundant suffix and become once again well known show_stack(). Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20200418201944.482088-51-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09csky: add show_stack_loglvl()Dmitry Safonov
Currently, the log-level of show_stack() depends on a platform realization. It creates situations where the headers are printed with lower log level or higher than the stacktrace (depending on a platform or user). Furthermore, it forces the logic decision from user to an architecture side. In result, some users as sysrq/kdb/etc are doing tricks with temporary rising console_loglevel while printing their messages. And in result it not only may print unwanted messages from other CPUs, but also omit printing at all in the unlucky case where the printk() was deferred. Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easier approach than introducing more printk buffers. Also, it will consolidate printings with headers. Introduce show_stack_loglvl(), that eventually will substitute show_stack(). [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Guo Ren <guoren@kernel.org> Link: http://lkml.kernel.org/r/20200418201944.482088-13-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-03csky: simplify detection of memory zone boundariesMike Rapoport
The free_area_init() function only requires the definition of maximal PFN for each of the supported zone rater than calculation of actual zone sizes and the sizes of the holes between the zones. After removal of CONFIG_HAVE_MEMBLOCK_NODE_MAP the free_area_init() is available to all architectures. Using this function instead of free_area_init_node() simplifies the zone detection. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Hoan Tran <hoan@os.amperecomputing.com> [arm64] Cc: Baoquan He <bhe@redhat.com> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200412194859.12663-10-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-05-28csky: Fixup CONFIG_DEBUG_RSEQGuo Ren
Put the rseq_syscall check point at the prologue of the syscall will break the a0 ... a7. This will casue system call bug when DEBUG_RSEQ is enabled. So move it to the epilogue of syscall, but before syscall_trace. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-28csky: Coding convention in entry.SGuo Ren
There is no fixup or feature in the patch, we only cleanup with: - Remove unnecessary reg used (r11, r12), just use r9 & r10 & syscallid regs as temp useage. - Add _TIF_SYSCALL_WORK and _TIF_WORK_MASK to gather macros. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-28csky: Fixup abiv2 syscall_trace break a4 & a5Guo Ren
Current implementation could destory a4 & a5 when strace, so we need to get them from pt_regs by SAVE_ALL. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-28csky: Fixup CONFIG_PREEMPT panicGuo Ren
log: [    0.13373200] Calibrating delay loop... [    0.14077600] ------------[ cut here ]------------ [    0.14116700] WARNING: CPU: 0 PID: 0 at kernel/sched/core.c:3790 preempt_count_add+0xc8/0x11c [    0.14348000] DEBUG_LOCKS_WARN_ON((preempt_count() < 0))Modules linked in: [    0.14395100] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0 #7 [    0.14410800] [    0.14427400] Call Trace: [    0.14450700] [<807cd226>] dump_stack+0x8a/0xe4 [    0.14473500] [<80072792>] __warn+0x10e/0x15c [    0.14495900] [<80072852>] warn_slowpath_fmt+0x72/0xc0 [    0.14518600] [<800a5240>] preempt_count_add+0xc8/0x11c [    0.14544900] [<807ef918>] _raw_spin_lock+0x28/0x68 [    0.14572600] [<800e0eb8>] vprintk_emit+0x84/0x2d8 [    0.14599000] [<800e113a>] vprintk_default+0x2e/0x44 [    0.14625100] [<800e2042>] vprintk_func+0x12a/0x1d0 [    0.14651300] [<800e1804>] printk+0x30/0x48 [    0.14677600] [<80008052>] lockdep_init+0x12/0xb0 [    0.14703800] [<80002080>] start_kernel+0x558/0x7f8 [    0.14730000] [<800052bc>] csky_start+0x58/0x94 [    0.14756600] irq event stamp: 34 [    0.14775100] hardirqs last  enabled at (33): [<80067370>] ret_from_exception+0x2c/0x72 [    0.14793700] hardirqs last disabled at (34): [<800e0eae>] vprintk_emit+0x7a/0x2d8 [    0.14812300] softirqs last  enabled at (32): [<800655b0>] __do_softirq+0x578/0x6d8 [    0.14830800] softirqs last disabled at (25): [<8007b3b8>] irq_exit+0xec/0x128 The preempt_count of reg could be destroyed after csky_do_IRQ without reload from memory. After reference to other architectures (arm64, riscv), we move preempt entry into ret_from_exception and disable irq at the beginning of ret_from_exception instead of RESTORE_ALL. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reported-by: Lu Baoquan <lu.baoquan@intellif.com>
2020-05-15csky: Fixup gdbmacros.txt with name sp in thread_structGuo Ren
The gdbmacros.txt use sp in thread_struct, but csky use ksp. This cause bttnobp fail to excute. TODO: - Still couldn't display the contents of stack. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-13csky: Fixup remove unnecessary save/restore PSR codeGuo Ren
All processes' PSR could success from SETUP_MMU, so need set it in INIT_THREAD again. And use a3 instead of r7 in __switch_to for code convention. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-13csky: Fixup remove duplicate irq_disableLiu Yibin
Interrupt has been disabled in __schedule() with local_irq_disable() and enabled in finish_task_switch->finish_lock_switch() with local_irq_enabled(), So needn't to disable irq here. Signed-off-by: Liu Yibin <jiulong@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-13csky: Fixup calltrace panicGuo Ren
The implementation of show_stack will panic with wrong fp: addr = *fp++; because the fp isn't checked properly. The current implementations of show_stack, wchan and stack_trace haven't been designed properly, so just deprecate them. This patch is a reference to riscv's way, all codes are modified from arm's. The patch is passed with: - cat /proc/<pid>/stack - cat /proc/<pid>/wchan - echo c > /proc/sysrq-trigger Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-13csky: Fixup perf callchain unwindMao Han
[ 5221.974084] Unable to handle kernel paging request at virtual address 0xfffff000, pc: 0x8002c18e [ 5221.985929] Oops: 00000000 [ 5221.989488] [ 5221.989488] CURRENT PROCESS: [ 5221.989488] [ 5221.992877] COMM=callchain_test PID=11962 [ 5221.995213] TEXT=00008000-000087e0 DATA=00009f1c-0000a018 BSS=0000a018-0000b000 [ 5221.999037] USER-STACK=7fc18e20 KERNEL-STACK=be204680 [ 5221.999037] [ 5222.003292] PC: 0x8002c18e (perf_callchain_kernel+0x3e/0xd4) [ 5222.007957] LR: 0x8002c198 (perf_callchain_kernel+0x48/0xd4) [ 5222.074873] Call Trace: [ 5222.074873] [<800a248e>] get_perf_callchain+0x20a/0x29c [ 5222.074873] [<8009d964>] perf_callchain+0x64/0x80 [ 5222.074873] [<8009dc1c>] perf_prepare_sample+0x29c/0x4b8 [ 5222.074873] [<8009de6e>] perf_event_output_forward+0x36/0x98 [ 5222.074873] [<800497e0>] search_exception_tables+0x20/0x44 [ 5222.074873] [<8002cbb6>] do_page_fault+0x92/0x378 [ 5222.074873] [<80098608>] __perf_event_overflow+0x54/0xdc [ 5222.074873] [<80098778>] perf_swevent_hrtimer+0xe8/0x164 [ 5222.074873] [<8002ddd0>] update_mmu_cache+0x0/0xd8 [ 5222.074873] [<8002c014>] user_backtrace+0x58/0xc4 [ 5222.074873] [<8002c0b4>] perf_callchain_user+0x34/0xd0 [ 5222.074873] [<800a2442>] get_perf_callchain+0x1be/0x29c [ 5222.074873] [<8009d964>] perf_callchain+0x64/0x80 [ 5222.074873] [<8009d834>] perf_output_sample+0x78c/0x858 [ 5222.074873] [<8009dc1c>] perf_prepare_sample+0x29c/0x4b8 [ 5222.074873] [<8009de94>] perf_event_output_forward+0x5c/0x98 [ 5222.097846] [ 5222.097846] [<800a0300>] perf_event_exit_task+0x58/0x43c [ 5222.097846] [<8006c874>] hrtimer_interrupt+0x104/0x2ec [ 5222.097846] [<800a0300>] perf_event_exit_task+0x58/0x43c [ 5222.097846] [<80437bb6>] dw_apb_clockevent_irq+0x2a/0x4c [ 5222.097846] [<8006c770>] hrtimer_interrupt+0x0/0x2ec [ 5222.097846] [<8005f2e4>] __handle_irq_event_percpu+0xac/0x19c [ 5222.097846] [<80437bb6>] dw_apb_clockevent_irq+0x2a/0x4c [ 5222.097846] [<8005f408>] handle_irq_event_percpu+0x34/0x88 [ 5222.097846] [<8005f480>] handle_irq_event+0x24/0x64 [ 5222.097846] [<8006218c>] handle_level_irq+0x68/0xdc [ 5222.097846] [<8005ec76>] __handle_domain_irq+0x56/0xa8 [ 5222.097846] [<80450e90>] ck_irq_handler+0xac/0xe4 [ 5222.097846] [<80029012>] csky_do_IRQ+0x12/0x24 [ 5222.097846] [<8002a3a0>] csky_irq+0x70/0x80 [ 5222.097846] [<800ca612>] alloc_set_pte+0xd2/0x238 [ 5222.097846] [<8002ddd0>] update_mmu_cache+0x0/0xd8 [ 5222.097846] [<800a0340>] perf_event_exit_task+0x98/0x43c The original fp check doesn't base on the real kernal stack region. Invalid fp address may cause kernel panic. Signed-off-by: Mao Han <han_mao@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2020-05-13csky: Fixup perf probe -x hungupGuo Ren
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/ftrace: Fixup error when disable CONFIG_DYNAMIC_FTRACEGuo Ren
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>
2020-04-03csky: Fixup cpu speculative execution to IO areaGuo Ren
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 Ren
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 Ren
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>
2020-04-02csky: Enable LOCKDEP_SUPPORTGuo Ren
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: Fixup get wrong psr value from phyical regGuo Ren
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 Ren
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>
2020-03-08csky: Implement ftrace with regsGuo Ren
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 Ren
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 Ren
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 Ren
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 Uytterhoeven
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 Ren
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 setup_initrd check codeGuo Ren
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/smp: Fixup boot failed when CONFIG_SMPGuo Ren
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 Ren
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: Separate fixaddr_init from highmemGuo Ren
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 Ren
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 Han
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>
2020-01-29Merge tag 'tty-5.6-rc1' of ↵Linus Torvalds
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 ...
2020-01-14arch/csky/setup: Drop dummy_con initializationArvind Sankar
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>
2019-12-08sched/rt, csky: Use CONFIG_PREEMPTIONThomas Gleixner
CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same functionality which today depends on CONFIG_PREEMPT. Switch the entry code over to use CONFIG_PREEMPTION. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Guo Ren <guoren@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20191015191821.11479-7-bigeasy@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-11-04vmlinux.lds.h: Replace RW_DATA_SECTION with RW_DATAKees Cook
Rename RW_DATA_SECTION to RW_DATA. (Calling this a "section" is a lie, since it's multiple sections and section flags cannot be applied to the macro.) Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # s390 Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-ia64@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20191029211351.13243-14-keescook@chromium.org
2019-11-04vmlinux.lds.h: Replace RO_DATA_SECTION with RO_DATAKees Cook
Finish renaming RO_DATA_SECTION to RO_DATA. (Calling this a "section" is a lie, since it's multiple sections and section flags cannot be applied to the macro.) Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # s390 Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-ia64@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20191029211351.13243-13-keescook@chromium.org
2019-11-04vmlinux.lds.h: Move NOTES into RO_DATAKees Cook
The .notes section should be non-executable read-only data. As such, move it to the RO_DATA macro instead of being per-architecture defined. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # s390 Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-ia64@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20191029211351.13243-11-keescook@chromium.org
2019-09-30csky: Move static keyword to the front of declarationKrzysztof Wilczynski
Move the static keyword to the front of declaration of csky_pmu_of_device_ids, and resolve the following compiler warning that can be seen when building with warnings enabled (W=1): arch/csky/kernel/perf_event.c:1340:1: warning: ‘static’ is not at beginning of declaration [-Wold-style-declaration] Signed-off-by: Krzysztof Wilczynski <kw@linux.com> Signed-off-by: Guo Ren <guoren@kernel.org>
2019-09-30csky: entry: Remove unneeded need_resched() loopValentin Schneider
Since the enabling and disabling of IRQs within preempt_schedule_irq() is contained in a need_resched() loop, we don't need the outer arch code loop. Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Guo Ren <guoren@kernel.org>
2019-09-30csky: Fixup csky_pmu.max_period assignmentMao Han
The csky_pmu.max_period has type u64, and BIT() can only return 32 bits unsigned long on C-SKY. The initialization for max_period will be incorrect when count_width is bigger than 32. Use BIT_ULL() Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <ren_guo@c-sky.com>
2019-09-30csky: Fixup add zero_fp fixup perf backtrace panicGuo Ren
We need set fp zero to let backtrace know the end. The patch fixup perf callchain panic problem, because backtrace didn't know what is the end of fp. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reported-by: Mao Han <han_mao@c-sky.com>
2019-07-19Merge tag 'csky-for-linus-5.3-rc1' of git://github.com/c-sky/csky-linuxLinus Torvalds
Pull arch/csky pupdates from Guo Ren: "This round of csky subsystem gives two features (ASID algorithm update, Perf pmu record support) and some fixups. ASID updates: - Revert mmu ASID mechanism - Add new asid lib code from arm - Use generic asid algorithm to implement switch_mm - Improve tlb operation with help of asid Perf pmu record support: - Init pmu as a device - Add count-width property for csky pmu - Add pmu interrupt support - Fix perf record in kernel/user space - dt-bindings: Add csky PMU bindings Fixes: - Fixup no panic in kernel for some traps - Fixup some error count in 810 & 860. - Fixup abiv1 memset error" * tag 'csky-for-linus-5.3-rc1' of git://github.com/c-sky/csky-linux: csky: Fixup abiv1 memset error csky: Improve tlb operation with help of asid csky: Use generic asid algorithm to implement switch_mm csky: Add new asid lib code from arm csky: Revert mmu ASID mechanism dt-bindings: csky: Add csky PMU bindings dt-bindings: interrupt-controller: Update csky mpintc csky: Fixup some error count in 810 & 860. csky: Fix perf record in kernel/user space csky: Add pmu interrupt support csky: Add count-width property for csky pmu csky: Init pmu as a device csky: Fixup no panic in kernel for some traps csky: Select intc & timer drivers
2019-07-19csky: Revert mmu ASID mechanismGuo Ren
Current C-SKY ASID mechanism is from mips and it doesn't work well with multi-cores. ASID per core mechanism is not suitable for C-SKY SMP tlb maintain operations, eg: tlbi.vas need share the same asid in all processors and it'll invalid the tlb entry in all cores with the same asid. This patch is prepare for new ASID mechanism. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
2019-07-19csky: Fixup some error count in 810 & 860.Guo Ren
CK810 pmu only support event with index 0-8 and 0xd; CK860 only support event 1~4, 0xa~0x1b. So do not register unsupport event to hardware cache event, which may leader to unknown behavior. Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <ren_guo@c-sky.com>
2019-07-19csky: Fix perf record in kernel/user spaceMao Han
csky_pmu_event_init is called several times during the perf record initialzation. After configure the event counter in either kernel space or user space, csky_pmu_event_init is called twice with no attr specified. Configuration will be overwritten with sampling in both kernel space and user space. --all-kernel/--all-user is useless without this patch applied. Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <guoren@kernel.org>
2019-07-19csky: Add pmu interrupt supportMao Han
This patch add interrupt request and handler for csky pmu. perf can record on hardware event with this patch applied. Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <guoren@kernel.org>
2019-07-19csky: Add count-width property for csky pmuMao Han
The csky pmu counter may have different io width. When the counter is smaller then 64 bits and counter value is smaller than the old value, it will result to a extremely large delta value. So the sampled value should be extend to 64 bits to avoid this, the extension bits base on the count-width property from dts. Signed-off-by: Mao Han <han_mao@c-sky.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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