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Subject[PATCH] arch/tile: stop disabling INTCTRL_1 interrupts during hypervisor downcalls
The problem was that this could lead to IPIs being disabled during
the softirq processing after a hypervisor downcall (e.g. for I/O),
since both IPI and device interrupts use the INCTRL_1 downcall mechanism.
When this happened at the wrong time, it could lead to deadlock.

Luckily, we were already maintaining the per-interrupt state we need,
and using it in the proper way in the hypervisor, so all we had to do
was to change Linux to stop blocking downcall interrupts for the entire
length of the downcall. (Now they're blocked while we're executing the
downcall routine itself, but not while we're executing any subsequent
softirq routines.) The hypervisor is doing a very small amount of
work it no longer needs to do (masking INTCTRL_1 on entry to the client
interrupt routine), but doing so means that older versions of Tile Linux
will continue to work with a current hypervisor, so that seems reasonable.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
---
arch/tile/kernel/intvec_32.S | 54 ++++--------------------------------------
1 files changed, 5 insertions(+), 49 deletions(-)

diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index 5eed4a0..abf92f5 100644
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -32,10 +32,6 @@
# error "No support for kernel preemption currently"
#endif

-#if INT_INTCTRL_K < 32 || INT_INTCTRL_K >= 48
-# error INT_INTCTRL_K coded to set high interrupt mask
-#endif
-
#define PTREGS_PTR(reg, ptreg) addli reg, sp, C_ABI_SAVE_AREA_SIZE + (ptreg)

#define PTREGS_OFFSET_SYSCALL PTREGS_OFFSET_REG(TREG_SYSCALL_NR)
@@ -1199,46 +1195,6 @@ STD_ENTRY(interrupt_return)
STD_ENDPROC(interrupt_return)

/*
- * This interrupt variant clears the INT_INTCTRL_K interrupt mask bit
- * before returning, so we can properly get more downcalls.
- */
- .pushsection .text.handle_interrupt_downcall,"ax"
-handle_interrupt_downcall:
- finish_interrupt_save handle_interrupt_downcall
- check_single_stepping normal, .Ldispatch_downcall
-.Ldispatch_downcall:
-
- /* Clear INTCTRL_K from the set of interrupts we ever enable. */
- GET_INTERRUPTS_ENABLED_MASK_PTR(r30)
- {
- addi r30, r30, 4
- movei r31, INT_MASK(INT_INTCTRL_K)
- }
- {
- lw r20, r30
- nor r21, r31, zero
- }
- and r20, r20, r21
- sw r30, r20
-
- {
- jalr r0
- PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
- }
- FEEDBACK_REENTER(handle_interrupt_downcall)
-
- /* Allow INTCTRL_K to be enabled next time we enable interrupts. */
- lw r20, r30
- or r20, r20, r31
- sw r30, r20
-
- {
- movei r30, 0 /* not an NMI */
- j interrupt_return
- }
- STD_ENDPROC(handle_interrupt_downcall)
-
- /*
* Some interrupts don't check for single stepping
*/
.pushsection .text.handle_interrupt_no_single_step,"ax"
@@ -2014,17 +1970,17 @@ int_unalign:
#endif
int_hand INT_INTCTRL_0, INTCTRL_0, bad_intr
int_hand INT_MESSAGE_RCV_DWNCL, MESSAGE_RCV_DWNCL, \
- hv_message_intr, handle_interrupt_downcall
+ hv_message_intr
int_hand INT_DEV_INTR_DWNCL, DEV_INTR_DWNCL, \
- tile_dev_intr, handle_interrupt_downcall
+ tile_dev_intr
int_hand INT_I_ASID, I_ASID, bad_intr
int_hand INT_D_ASID, D_ASID, bad_intr
int_hand INT_DMATLB_MISS_DWNCL, DMATLB_MISS_DWNCL, \
- do_page_fault, handle_interrupt_downcall
+ do_page_fault
int_hand INT_SNITLB_MISS_DWNCL, SNITLB_MISS_DWNCL, \
- do_page_fault, handle_interrupt_downcall
+ do_page_fault
int_hand INT_DMATLB_ACCESS_DWNCL, DMATLB_ACCESS_DWNCL, \
- do_page_fault, handle_interrupt_downcall
+ do_page_fault
int_hand INT_SN_CPL, SN_CPL, bad_intr
int_hand INT_DOUBLE_FAULT, DOUBLE_FAULT, do_trap
#if CHIP_HAS_AUX_PERF_COUNTERS()
--
1.6.5.2


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