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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-25 15:59:38 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-25 15:59:38 -0700 |
commit | fa2af6e4fe0c4d2f8875d42625b25675e8584010 (patch) | |
tree | ef9a92949858ab763aa1bfda7cb11a5f7b84d123 /arch/tile/kernel/intvec_64.S | |
parent | intel-iommu: Move duplicate list-mangling code into unlink_domain_info() helper (diff) | |
parent | tile: default to tilegx_defconfig for ARCH=tile (diff) | |
download | linux-dev-fa2af6e4fe0c4d2f8875d42625b25675e8584010.tar.xz linux-dev-fa2af6e4fe0c4d2f8875d42625b25675e8584010.zip |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
Pull tile updates from Chris Metcalf:
"These changes cover a range of new arch/tile features and
optimizations. They've been through LKML review and on linux-next for
a month or so. There's also one bug-fix that just missed 3.4, which
I've marked for stable."
Fixed up trivial conflict in arch/tile/Kconfig (new added tile Kconfig
entries clashing with the generic timer/clockevents changes).
* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
tile: default to tilegx_defconfig for ARCH=tile
tile: fix bug where fls(0) was not returning 0
arch/tile: mark TILEGX as not EXPERIMENTAL
tile/mm/fault.c: Port OOM changes to handle_page_fault
arch/tile: add descriptive text if the kernel reports a bad trap
arch/tile: allow querying cpu module information from the hypervisor
arch/tile: fix hardwall for tilegx and generalize for idn and ipi
arch/tile: support multiple huge page sizes dynamically
mm: add new arch_make_huge_pte() method for tile support
arch/tile: support kexec() for tilegx
arch/tile: support <asm/cachectl.h> header for cacheflush() syscall
arch/tile: Allow tilegx to build with either 16K or 64K page size
arch/tile: optimize get_user/put_user and friends
arch/tile: support building big-endian kernel
arch/tile: allow building Linux with transparent huge pages enabled
arch/tile: use interrupt critical sections less
Diffstat (limited to 'arch/tile/kernel/intvec_64.S')
-rw-r--r-- | arch/tile/kernel/intvec_64.S | 80 |
1 files changed, 44 insertions, 36 deletions
diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S index 30ae76e50c44..7c06d597ffd0 100644 --- a/arch/tile/kernel/intvec_64.S +++ b/arch/tile/kernel/intvec_64.S @@ -220,7 +220,9 @@ intvec_\vecname: * This routine saves just the first four registers, plus the * stack context so we can do proper backtracing right away, * and defers to handle_interrupt to save the rest. - * The backtracer needs pc, ex1, lr, sp, r52, and faultnum. + * The backtracer needs pc, ex1, lr, sp, r52, and faultnum, + * and needs sp set to its final location at the bottom of + * the stack frame. */ addli r0, r0, PTREGS_OFFSET_LR - (PTREGS_SIZE + KSTK_PTREGS_GAP) wh64 r0 /* cache line 7 */ @@ -450,23 +452,6 @@ intvec_\vecname: push_reg r5, r52 st r52, r4 - /* Load tp with our per-cpu offset. */ -#ifdef CONFIG_SMP - { - mfspr r20, SPR_SYSTEM_SAVE_K_0 - moveli r21, hw2_last(__per_cpu_offset) - } - { - shl16insli r21, r21, hw1(__per_cpu_offset) - bfextu r20, r20, 0, LOG2_THREAD_SIZE-1 - } - shl16insli r21, r21, hw0(__per_cpu_offset) - shl3add r20, r20, r21 - ld tp, r20 -#else - move tp, zero -#endif - /* * If we will be returning to the kernel, we will need to * reset the interrupt masks to the state they had before. @@ -489,6 +474,44 @@ intvec_\vecname: .endif st r21, r32 + /* + * we've captured enough state to the stack (including in + * particular our EX_CONTEXT state) that we can now release + * the interrupt critical section and replace it with our + * standard "interrupts disabled" mask value. This allows + * synchronous interrupts (and profile interrupts) to punch + * through from this point onwards. + * + * It's important that no code before this point touch memory + * other than our own stack (to keep the invariant that this + * is all that gets touched under ICS), and that no code after + * this point reference any interrupt-specific SPR, in particular + * the EX_CONTEXT_K_ values. + */ + .ifc \function,handle_nmi + IRQ_DISABLE_ALL(r20) + .else + IRQ_DISABLE(r20, r21) + .endif + mtspr INTERRUPT_CRITICAL_SECTION, zero + + /* Load tp with our per-cpu offset. */ +#ifdef CONFIG_SMP + { + mfspr r20, SPR_SYSTEM_SAVE_K_0 + moveli r21, hw2_last(__per_cpu_offset) + } + { + shl16insli r21, r21, hw1(__per_cpu_offset) + bfextu r20, r20, 0, LOG2_THREAD_SIZE-1 + } + shl16insli r21, r21, hw0(__per_cpu_offset) + shl3add r20, r20, r21 + ld tp, r20 +#else + move tp, zero +#endif + #ifdef __COLLECT_LINKER_FEEDBACK__ /* * Notify the feedback routines that we were in the @@ -513,21 +536,6 @@ intvec_\vecname: #endif /* - * we've captured enough state to the stack (including in - * particular our EX_CONTEXT state) that we can now release - * the interrupt critical section and replace it with our - * standard "interrupts disabled" mask value. This allows - * synchronous interrupts (and profile interrupts) to punch - * through from this point onwards. - */ - .ifc \function,handle_nmi - IRQ_DISABLE_ALL(r20) - .else - IRQ_DISABLE(r20, r21) - .endif - mtspr INTERRUPT_CRITICAL_SECTION, zero - - /* * Prepare the first 256 stack bytes to be rapidly accessible * without having to fetch the background data. */ @@ -736,9 +744,10 @@ STD_ENTRY(interrupt_return) beqzt r30, .Lrestore_regs j 3f 2: TRACE_IRQS_ON + IRQ_ENABLE_LOAD(r20, r21) movei r0, 1 mtspr INTERRUPT_CRITICAL_SECTION, r0 - IRQ_ENABLE(r20, r21) + IRQ_ENABLE_APPLY(r20, r21) beqzt r30, .Lrestore_regs 3: @@ -755,7 +764,6 @@ STD_ENTRY(interrupt_return) * that will save some cycles if this turns out to be a syscall. */ .Lrestore_regs: - FEEDBACK_REENTER(interrupt_return) /* called from elsewhere */ /* * Rotate so we have one high bit and one low bit to test. @@ -1249,7 +1257,7 @@ STD_ENTRY(fill_ra_stack) int_hand INT_UNALIGN_DATA, UNALIGN_DATA, int_unalign int_hand INT_DTLB_MISS, DTLB_MISS, do_page_fault int_hand INT_DTLB_ACCESS, DTLB_ACCESS, do_page_fault - int_hand INT_IDN_FIREWALL, IDN_FIREWALL, bad_intr + int_hand INT_IDN_FIREWALL, IDN_FIREWALL, do_hardwall_trap int_hand INT_UDN_FIREWALL, UDN_FIREWALL, do_hardwall_trap int_hand INT_TILE_TIMER, TILE_TIMER, do_timer_interrupt int_hand INT_IDN_TIMER, IDN_TIMER, bad_intr |