membarrier-sync-core: Document architecture support
Ensure we gather architecture requirements about each architecture supporting the "sync_core" membarrier command in a single file under Documentation/features. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrea Parri <parri.andrea@gmail.com> Cc: Andrew Hunter <ahh@google.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Avi Kivity <avi@scylladb.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Dave Watson <davejwatson@fb.com> Cc: David Sehr <sehr@google.com> Cc: Greg Hackmann <ghackmann@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Maged Michael <maged.michael@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-api@vger.kernel.org Cc: linux-arch@vger.kernel.org Link: http://lkml.kernel.org/r/1518208256-22034-1-git-send-email-mathieu.desnoyers@efficios.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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#
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# Feature name: membarrier-sync-core
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# Kconfig: ARCH_HAS_MEMBARRIER_SYNC_CORE
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# description: arch supports core serializing membarrier
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#
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# Architecture requirements
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#
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# * arm64
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#
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# Rely on eret context synchronization when returning from IPI handler, and
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# when returning to user-space.
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#
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# * x86
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#
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# x86-32 uses IRET as return from interrupt, which takes care of the IPI.
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# However, it uses both IRET and SYSEXIT to go back to user-space. The IRET
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# instruction is core serializing, but not SYSEXIT.
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#
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# x86-64 uses IRET as return from interrupt, which takes care of the IPI.
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# However, it can return to user-space through either SYSRETL (compat code),
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# SYSRETQ, or IRET.
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#
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# Given that neither SYSRET{L,Q}, nor SYSEXIT, are core serializing, we rely
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# instead on write_cr3() performed by switch_mm() to provide core serialization
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# after changing the current mm, and deal with the special case of kthread ->
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# uthread (temporarily keeping current mm into active_mm) by issuing a
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# sync_core_before_usermode() in that specific case.
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#
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-----------------------
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| arch |status|
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-----------------------
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| alpha: | TODO |
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| arc: | TODO |
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| arm: | TODO |
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| arm64: | ok |
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| blackfin: | TODO |
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| c6x: | TODO |
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| cris: | TODO |
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| frv: | TODO |
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| h8300: | TODO |
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| hexagon: | TODO |
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| ia64: | TODO |
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| m32r: | TODO |
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| m68k: | TODO |
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| metag: | TODO |
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| microblaze: | TODO |
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| mips: | TODO |
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| mn10300: | TODO |
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| nios2: | TODO |
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| openrisc: | TODO |
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| parisc: | TODO |
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| powerpc: | TODO |
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| s390: | TODO |
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| score: | TODO |
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| sh: | TODO |
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| sparc: | TODO |
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| tile: | TODO |
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| um: | TODO |
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| unicore32: | TODO |
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| x86: | ok |
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| xtensa: | TODO |
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-----------------------
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