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x86: UV BAU messaging timeouts 

This patch replaces a 'nop' uv_enable_timeouts() in the
UV TLB shootdown code. (somehow, long ago that function got
eviscerated)

If any cpu in the destination node does not get interrupted by the
message and post completion in a reasonable time the hardware
should respond to the sender with an error.  This function
enables such timeouts.

Tested on the UV hardware simulator.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
LKML-Reference: <E1LpjXU-00007e-Qh@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cliff Wickman 2009-04-03 08:34:32 -05:00 committed by Ingo Molnar
parent 9674f35b1e
commit c4c4688f72
2 changed files with 50 additions and 11 deletions
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5
arch/x86/include/asm/uv/uv_mmrs.h
View File

@ -17,6 +17,11 @@
/* ========================================================================= */
/* UVH_BAU_DATA_CONFIG */
/* ========================================================================= */
#define UVH_LB_BAU_MISC_CONTROL 0x320170UL
#define UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT 15
#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT 16
#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x000000000bUL
/* 1011 timebase 7 (168millisec) * 3 ticks -> 500ms */
#define UVH_BAU_DATA_CONFIG 0x61680UL
#define UVH_BAU_DATA_CONFIG_32 0x0438

56
arch/x86/kernel/tlb_uv.c
View File

@ -445,24 +445,58 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
set_irq_regs(old_regs);
}
/*
* uv_enable_timeouts
*
* Each target blade (i.e. blades that have cpu's) needs to have
* shootdown message timeouts enabled. The timeout does not cause
* an interrupt, but causes an error message to be returned to
* the sender.
*/
static void uv_enable_timeouts(void)
{
int i;
int blade;
int last_blade;
int nblades;
int pnode;
int cur_cpu = 0;
unsigned long apicid;
unsigned long mmr_image;
last_blade = -1;
for_each_online_node(i) {
blade = uv_node_to_blade_id(i);
if (blade == last_blade)
nblades = uv_num_possible_blades();
for (blade = 0; blade < nblades; blade++) {
if (!uv_blade_nr_possible_cpus(blade))
continue;
last_blade = blade;
apicid = per_cpu(x86_cpu_to_apicid, cur_cpu);
pnode = uv_blade_to_pnode(blade);
cur_cpu += uv_blade_nr_possible_cpus(i);
mmr_image =
uv_read_global_mmr64(pnode, UVH_LB_BAU_MISC_CONTROL);
/*
* Set the timeout period and then lock it in, in three
* steps; captures and locks in the period.
*
* To program the period, the SOFT_ACK_MODE must be off.
*/
mmr_image &= ~((unsigned long)1 <<
UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
/*
* Set the 4-bit period.
*/
mmr_image &= ~((unsigned long)0xf <<
UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT);
mmr_image |= (UV_INTD_SOFT_ACK_TIMEOUT_PERIOD <<
UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
/*
* Subsequent reversals of the timebase bit (3) cause an
* immediate timeout of one or all INTD resources as
* indicated in bits 2:0 (7 causes all of them to timeout).
*/
mmr_image |= ((unsigned long)1 <<
UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
}
}