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x86, UV: Calculate BAU destination timeout

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Calculate the Broadcast Assist Unit's destination timeout period from the
values in the relevant MMR's.

Store it in each cpu's per-cpu BAU structure so that a destination
timeout can be differentiated from a 'plugged' situation in which all
software ack resources are already allocated and a timeout is pending.
That case returns an immediate destination error.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: gregkh@suse.de
LKML-Reference: <E1OJvNx-0004Zq-RK@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cliff Wickman 2010-06-02 16:22:01 -05:00 committed by Ingo Molnar
parent 3975d16760
commit 12a6611fa1
2 changed files with 59 additions and 4 deletions
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12
arch/x86/include/asm/uv/uv_bau.h
View File

@ -49,6 +49,18 @@
#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
/* [19:16] SOFT_ACK timeout period 19: 1 is urgency 7 17:16 1 is multiplier */
#define BAU_MISC_CONTROL_MULT_MASK 3
#define UVH_AGING_PRESCALE_SEL 0x000000b000UL
/* [30:28] URGENCY_7 an index into a table of times */
#define BAU_URGENCY_7_SHIFT 28
#define BAU_URGENCY_7_MASK 7
#define UVH_TRANSACTION_TIMEOUT 0x000000b200UL
/* [45:40] BAU - BAU transaction timeout select - a multiplier */
#define BAU_TRANS_SHIFT 40
#define BAU_TRANS_MASK 0x3f
/*
* bits in UVH_LB_BAU_SB_ACTIVATION_STATUS_0/1

51
arch/x86/kernel/tlb_uv.c
View File

@ -30,6 +30,19 @@ struct msg_desc {
struct bau_payload_queue_entry *va_queue_last;
};
/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
static int timeout_base_ns[] = {
20,
160,
1280,
10240,
81920,
655360,
5242880,
167772160
};
static int timeout_us;
#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x000000000bUL
static int uv_bau_max_concurrent __read_mostly;
@ -423,7 +436,8 @@ static int uv_wait_completion(struct bau_desc *bau_desc,
* pending. In that case hardware returns the
* ERROR that looks like a destination timeout.
*/
if (cycles_2_us(ttime - bcp->send_message) < BIOS_TO) {
if (cycles_2_us(ttime - bcp->send_message) <
timeout_us) {
bcp->conseccompletes = 0;
return FLUSH_RETRY_PLUGGED;
}
@ -908,12 +922,12 @@ static void uv_ptc_seq_stop(struct seq_file *file, void *data)
}
static inline unsigned long long
millisec_2_cycles(unsigned long millisec)
microsec_2_cycles(unsigned long microsec)
{
unsigned long ns;
unsigned long long cyc;
ns = millisec * 1000;
ns = microsec * 1000;
cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
return cyc;
}
@ -1258,6 +1272,33 @@ static void __init uv_init_uvhub(int uvhub, int vector)
((apicid << 32) | vector));
}
/*
* We will set BAU_MISC_CONTROL with a timeout period.
* But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT.
* So the destination timeout period has be be calculated from them.
*/
static int
calculate_destination_timeout(void)
{
unsigned long mmr_image;
int mult1;
int mult2;
int index;
int base;
int ret;
unsigned long ts_ns;
mult1 = UV_INTD_SOFT_ACK_TIMEOUT_PERIOD & BAU_MISC_CONTROL_MULT_MASK;
mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL);
index = (mmr_image >> BAU_URGENCY_7_SHIFT) & BAU_URGENCY_7_MASK;
mmr_image = uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT);
mult2 = (mmr_image >> BAU_TRANS_SHIFT) & BAU_TRANS_MASK;
base = timeout_base_ns[index];
ts_ns = base * mult1 * mult2;
ret = ts_ns / 1000;
return ret;
}
/*
* initialize the bau_control structure for each cpu
*/
@ -1286,6 +1327,8 @@ static void uv_init_per_cpu(int nuvhubs)
};
struct uvhub_desc *uvhub_descs;
timeout_us = calculate_destination_timeout();
uvhub_descs = (struct uvhub_desc *)
kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
@ -1301,7 +1344,7 @@ static void uv_init_per_cpu(int nuvhubs)
bdp->uvhub = uvhub;
bdp->pnode = pnode;
/* time interval to catch a hardware stay-busy bug */
bcp->timeout_interval = millisec_2_cycles(3);
bcp->timeout_interval = microsec_2_cycles(2*timeout_us);
/* kludge: assume uv_hub.h is constant */
socket = (cpu_physical_id(cpu)>>5)&1;
if (socket >= bdp->num_sockets)