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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-17 14:23:52 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-17 14:23:52 -0800 |
commit | e71d5126e77c68b7ed1fad275fdc8825e9597448 (patch) | |
tree | 038f23568881d65cb269c9c4b92e65a2d7131456 /arch/s390/include/asm/mmu_context.h | |
parent | c3e9c04b89059a4c93c792da883ca284de182da5 (diff) | |
parent | ab35727eb879ccc9487c6df0a3796be124ed39d3 (diff) | |
download | op-kernel-dev-e71d5126e77c68b7ed1fad275fdc8825e9597448.zip op-kernel-dev-e71d5126e77c68b7ed1fad275fdc8825e9597448.tar.gz |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull second round of s390 updates from Martin Schwidefsky:
- rework of the vdso code to avoid the use of the access register mode
- use perf AUX buffers for the transport of diagnostic sample data
- add perf_regs and user stack dump support
- enable perf call graphs for user space programs
- add perf register support for floating-point registers
- all remaining s390 related timer_setup conversions
- bug fixes and cleanups
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (30 commits)
s390: remove unused parameter from Makefile
zfcp: purely mechanical update using timer API, plus blank lines
s390/scsi: Convert timers to use timer_setup()
s390/cpum_sf: correctly set the PID and TID in perf samples
s390/cpum_sf: load program parameter at sampler enablement
s390/perf: add perf register support for floating-point registers
s390/perf: extend perf_regs support to include floating-point registers
s390/perf: define common DWARF register string table
s390/perf: add support for perf_regs and libdw
s390/perf: add perf_regs support and user stack dump
s390/cpum_sf: do not register PMU if no sampling mode is authorized
s390/cpumf: remove raw event support in basic-only sampling mode
s390/perf: add callback to perf to enable using AUX buffer
s390/cpumf: enable using AUX buffer
s390/cpumf: introduce AUX buffer for dump diagnostic sample data
s390/disassembler: increase show_code buffer size
s390: Remove CONFIG_HARDENED_USERCOPY
s390: enable CPU alternatives unconditionally
s390/nmi: remove unused code
s390/mm: remove unused code
...
Diffstat (limited to 'arch/s390/include/asm/mmu_context.h')
-rw-r--r-- | arch/s390/include/asm/mmu_context.h | 36 |
1 files changed, 16 insertions, 20 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index cf4c1cb..f4a07f7 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -73,41 +73,38 @@ static inline int init_new_context(struct task_struct *tsk, static inline void set_user_asce(struct mm_struct *mm) { S390_lowcore.user_asce = mm->context.asce; - if (current->thread.mm_segment.ar4) - __ctl_load(S390_lowcore.user_asce, 7, 7); - set_cpu_flag(CIF_ASCE_PRIMARY); + __ctl_load(S390_lowcore.user_asce, 1, 1); + clear_cpu_flag(CIF_ASCE_PRIMARY); } static inline void clear_user_asce(void) { S390_lowcore.user_asce = S390_lowcore.kernel_asce; - - __ctl_load(S390_lowcore.user_asce, 1, 1); - __ctl_load(S390_lowcore.user_asce, 7, 7); -} - -static inline void load_kernel_asce(void) -{ - unsigned long asce; - - __ctl_store(asce, 1, 1); - if (asce != S390_lowcore.kernel_asce) - __ctl_load(S390_lowcore.kernel_asce, 1, 1); + __ctl_load(S390_lowcore.kernel_asce, 1, 1); set_cpu_flag(CIF_ASCE_PRIMARY); } +mm_segment_t enable_sacf_uaccess(void); +void disable_sacf_uaccess(mm_segment_t old_fs); + static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { int cpu = smp_processor_id(); - S390_lowcore.user_asce = next->context.asce; if (prev == next) return; + S390_lowcore.user_asce = next->context.asce; cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); - /* Clear old ASCE by loading the kernel ASCE. */ - __ctl_load(S390_lowcore.kernel_asce, 1, 1); - __ctl_load(S390_lowcore.kernel_asce, 7, 7); + /* Clear previous user-ASCE from CR1 and CR7 */ + if (!test_cpu_flag(CIF_ASCE_PRIMARY)) { + __ctl_load(S390_lowcore.kernel_asce, 1, 1); + set_cpu_flag(CIF_ASCE_PRIMARY); + } + if (test_cpu_flag(CIF_ASCE_SECONDARY)) { + __ctl_load(S390_lowcore.vdso_asce, 7, 7); + clear_cpu_flag(CIF_ASCE_SECONDARY); + } cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); } @@ -117,7 +114,6 @@ static inline void finish_arch_post_lock_switch(void) struct task_struct *tsk = current; struct mm_struct *mm = tsk->mm; - load_kernel_asce(); if (mm) { preempt_disable(); while (atomic_read(&mm->context.flush_count)) |