/* * Generic barrier definitions, originally based on MN10300 definitions. * * It should be possible to use these on really simple architectures, * but it serves more as a starting point for new ports. * * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #ifndef __ASM_GENERIC_BARRIER_H #define __ASM_GENERIC_BARRIER_H #ifndef __ASSEMBLY__ #include #ifndef nop #define nop() asm volatile ("nop") #endif /* * Force strict CPU ordering. And yes, this is required on UP too when we're * talking to devices. * * Fall back to compiler barriers if nothing better is provided. */ #ifndef mb #define mb() barrier() #endif #ifndef rmb #define rmb() mb() #endif #ifndef wmb #define wmb() mb() #endif #ifndef dma_rmb #define dma_rmb() rmb() #endif #ifndef dma_wmb #define dma_wmb() wmb() #endif #ifndef read_barrier_depends #define read_barrier_depends() do { } while (0) #endif #ifndef __smp_mb #define __smp_mb() mb() #endif #ifndef __smp_rmb #define __smp_rmb() rmb() #endif #ifndef __smp_wmb #define __smp_wmb() wmb() #endif #ifndef __smp_read_barrier_depends #define __smp_read_barrier_depends() read_barrier_depends() #endif #ifdef CONFIG_SMP #ifndef smp_mb #define smp_mb() __smp_mb() #endif #ifndef smp_rmb #define smp_rmb() __smp_rmb() #endif #ifndef smp_wmb #define smp_wmb() __smp_wmb() #endif #ifndef smp_read_barrier_depends #define smp_read_barrier_depends() __smp_read_barrier_depends() #endif #else /* !CONFIG_SMP */ #ifndef smp_mb #define smp_mb() barrier() #endif #ifndef smp_rmb #define smp_rmb() barrier() #endif #ifndef smp_wmb #define smp_wmb() barrier() #endif #ifndef smp_read_barrier_depends #define smp_read_barrier_depends() do { } while (0) #endif #endif /* CONFIG_SMP */ #ifndef __smp_store_mb #define __smp_store_mb(var, value) do { WRITE_ONCE(var, value); __smp_mb(); } while (0) #endif #ifndef __smp_mb__before_atomic #define __smp_mb__before_atomic() __smp_mb() #endif #ifndef __smp_mb__after_atomic #define __smp_mb__after_atomic() __smp_mb() #endif #ifndef __smp_store_release #define __smp_store_release(p, v) \ do { \ compiletime_assert_atomic_type(*p); \ __smp_mb(); \ WRITE_ONCE(*p, v); \ } while (0) #endif #ifndef __smp_load_acquire #define __smp_load_acquire(p) \ ({ \ typeof(*p) ___p1 = READ_ONCE(*p); \ compiletime_assert_atomic_type(*p); \ __smp_mb(); \ ___p1; \ }) #endif #ifdef CONFIG_SMP #ifndef smp_store_mb #define smp_store_mb(var, value) __smp_store_mb(var, value) #endif #ifndef smp_mb__before_atomic #define smp_mb__before_atomic() __smp_mb__before_atomic() #endif #ifndef smp_mb__after_atomic #define smp_mb__after_atomic() __smp_mb__after_atomic() #endif #ifndef smp_store_release #define smp_store_release(p, v) __smp_store_release(p, v) #endif #ifndef smp_load_acquire #define smp_load_acquire(p) __smp_load_acquire(p) #endif #else /* !CONFIG_SMP */ #ifndef smp_store_mb #define smp_store_mb(var, value) do { WRITE_ONCE(var, value); barrier(); } while (0) #endif #ifndef smp_mb__before_atomic #define smp_mb__before_atomic() barrier() #endif #ifndef smp_mb__after_atomic #define smp_mb__after_atomic() barrier() #endif #ifndef smp_store_release #define smp_store_release(p, v) \ do { \ compiletime_assert_atomic_type(*p); \ barrier(); \ WRITE_ONCE(*p, v); \ } while (0) #endif #ifndef smp_load_acquire #define smp_load_acquire(p) \ ({ \ typeof(*p) ___p1 = READ_ONCE(*p); \ compiletime_assert_atomic_type(*p); \ barrier(); \ ___p1; \ }) #endif #endif /* CONFIG_SMP */ /* Barriers for virtual machine guests when talking to an SMP host */ #define virt_mb() __smp_mb() #define virt_rmb() __smp_rmb() #define virt_wmb() __smp_wmb() #define virt_read_barrier_depends() __smp_read_barrier_depends() #define virt_store_mb(var, value) __smp_store_mb(var, value) #define virt_mb__before_atomic() __smp_mb__before_atomic() #define virt_mb__after_atomic() __smp_mb__after_atomic() #define virt_store_release(p, v) __smp_store_release(p, v) #define virt_load_acquire(p) __smp_load_acquire(p) /** * smp_acquire__after_ctrl_dep() - Provide ACQUIRE ordering after a control dependency * * A control dependency provides a LOAD->STORE order, the additional RMB * provides LOAD->LOAD order, together they provide LOAD->{LOAD,STORE} order, * aka. (load)-ACQUIRE. * * Architectures that do not do load speculation can have this be barrier(). */ #ifndef smp_acquire__after_ctrl_dep #define smp_acquire__after_ctrl_dep() smp_rmb() #endif /** * smp_cond_load_acquire() - (Spin) wait for cond with ACQUIRE ordering * @ptr: pointer to the variable to wait on * @cond: boolean expression to wait for * * Equivalent to using smp_load_acquire() on the condition variable but employs * the control dependency of the wait to reduce the barrier on many platforms. * * Due to C lacking lambda expressions we load the value of *ptr into a * pre-named variable @VAL to be used in @cond. */ #ifndef smp_cond_load_acquire #define smp_cond_load_acquire(ptr, cond_expr) ({ \ typeof(ptr) __PTR = (ptr); \ typeof(*ptr) VAL; \ for (;;) { \ VAL = READ_ONCE(*__PTR); \ if (cond_expr) \ break; \ cpu_relax(); \ } \ smp_acquire__after_ctrl_dep(); \ VAL; \ }) #endif #endif /* !__ASSEMBLY__ */ #endif /* __ASM_GENERIC_BARRIER_H */ -next.git/patch/include/dt-bindings/pinctrl/am33xx.h?id=54791b276b4000b307339f269d3bf7db877d536f'>patch) tree1c2616bd373ce5ea28aac2a53e32f5b5834901ce /include/dt-bindings/pinctrl/am33xx.h parent5d0e7705774dd412a465896d08d59a81a345c1e4 (diff)parent047487241ff59374fded8c477f21453681f5995c (diff)
Merge branch 'sparc64-non-resumable-user-error-recovery'
Liam R. Howlett says: ==================== sparc64: Recover from userspace non-resumable PIO & MEM errors A non-resumable error from userspace is able to cause a kernel panic or trap loop due to the setup and handling of the queued traps once in the kernel. This patch series addresses both of these issues. The queues are fixed by simply zeroing the memory before use. PIO errors from userspace will result in a SIGBUS being sent to the user process. The MEM errors form userspace will result in a SIGKILL and also cause the offending pages to be claimed so they are no longer used in future tasks. SIGKILL is used to ensure that the process does not try to coredump and result in an attempt to read the memory again from within kernel space. Although there is a HV call to scrub the memory (mem_scrub), there is no easy way to guarantee that the real memory address(es) are not used by other tasks. Clearing the error with mem_scrub would zero the memory and cause the other processes to proceed with bad data. The handling of other non-resumable errors remain unchanged and will cause a panic. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/dt-bindings/pinctrl/am33xx.h')