kernel/linux.git/arch/arc/include/asm/mmu.h, branch linux-4.16.y

ARCv2: PAE40: set MSB even if !CONFIG_ARC_HAS_PAE40 but PAE exists in SoC

2017-08-04T08:26:35+00:00

PAE40 confiuration in hardware extends some of the address registers for TLB/cache ops to 2 words. So far kernel was NOT setting the higher word if feature was not enabled in software which is wrong. Those need to be set to 0 in such case. Normally this would be done in the cache flush / tlb ops, however since these registers only exist conditionally, this would have to be conditional to a flag being set on boot which is expensive/ugly - specially for the more common case of PAE exists but not in use. Optimize that by zero'ing them once at boot - nobody will write to them afterwards Cc: stable@vger.kernel.org #4.4+ Signed-off-by: Vineet Gupta

ARC: mm: fix build failure in linux-next for UP builds

2017-05-05T19:06:33+00:00

kisskb build service reported ARC defconfig build failures in linux-next | arch/arc/include/asm/mmu.h:75:21: error: 'NR_CPUS' undeclared here (not in a function) | make[3]: *** [arch/arc/mm/ioremap.o] Error 1 | make[2]: *** [arch/arc/mm] Error 2 | make[1]: *** [arch/arc] Error 2 which I bisected to a subtle side-effect of a totally benign mm patch ("mm, vmalloc: properly track vmalloc users") which caused a header include chain deviation - asm/mmu.h using NR_CPUS before including linux/threads.h Fix that by adding the dependnet header and while it at fix a related header to include linux headers aheads of asm headers as sometimes that slso triggers such issues ! Reported-by: noreply@ellerman.id.au Signed-off-by: Vineet Gupta

ARC: mm: PAE40 support

2015-10-29T13:11:30+00:00

This is the first working implementation of 40-bit physical address extension on ARCv2. Signed-off-by: Alexey Brodkin Signed-off-by: Vineet Gupta

ARCv2: MMUv4: TLB programming Model changes

2015-06-22T08:36:55+00:00

Signed-off-by: Vineet Gupta

ARC: [SMP] ASID allocation

2013-11-06T05:11:45+00:00

-Track a Per CPU ASID counter -mm-per-cpu ASID (multiple threads, or mm migrated around) Signed-off-by: Vineet Gupta

ARC: fix new Section mismatches in build (post __cpuinit cleanup)

2013-09-05T13:49:06+00:00

--------------->8-------------------- WARNING: vmlinux.o(.text+0x708): Section mismatch in reference from the function read_arc_build_cfg_regs() to the function .init.text:read_decode_cache_bcr() WARNING: vmlinux.o(.text+0x702): Section mismatch in reference from the function read_arc_build_cfg_regs() to the function .init.text:read_decode_mmu_bcr() --------------->8-------------------- Signed-off-by: Vineet Gupta

ARC: [ASID] Track ASID allocation cycles/generations

2013-08-30T16:12:19+00:00

This helps remove asid-to-mm reverse map While mm->context.id contains the ASID assigned to a process, our ASID allocator also used asid_mm_map[] reverse map. In a new allocation cycle (mm->ASID >= @asid_cache), the Round Robin ASID allocator used this to check if new @asid_cache belonged to some mm2 (from prev cycle). If so, it could locate that mm using the ASID reverse map, and mark that mm as unallocated ASID, to force it to refresh at the time of switch_mm() However, for SMP, the reverse map has to be maintained per CPU, so becomes 2 dimensional, hence got rid of it. With reverse map gone, it is NOT possible to reach out to current assignee. So we track the ASID allocation generation/cycle and on every switch_mm(), check if the current generation of CPU ASID is same as mm's ASID; If not it is refreshed. (Based loosely on arch/sh implementation) Signed-off-by: Vineet Gupta

ARC: [ASID] Refactor the TLB paranoid debug code

2013-08-30T16:12:18+00:00

-Asm code already has values of SW and HW ASID values, so they can be passed to the printing routine. Signed-off-by: Vineet Gupta

ARC: [ASID] Remove legacy/unused debug code

2013-08-30T16:12:17+00:00

Signed-off-by: Vineet Gupta

ARC: MMUv4 preps/3 - Abstract out TLB Insert/Delete

2013-08-30T04:52:48+00:00

This reorganizes the current TLB operations into psuedo-ops to better pair with MMUv4's native Insert/Delete operations Signed-off-by: Vineet Gupta