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-rw-r--r--arch/x86/kernel/tlb_uv.c756
1 files changed, 506 insertions, 250 deletions
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 7fea555929e2..59efb5390b37 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -8,6 +8,7 @@
*/
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
+#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
@@ -22,19 +23,37 @@
#include <asm/irq_vectors.h>
#include <asm/timer.h>
-struct msg_desc {
- struct bau_payload_queue_entry *msg;
- int msg_slot;
- int sw_ack_slot;
- struct bau_payload_queue_entry *va_queue_first;
- 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
};
-
-#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x000000000bUL
-
-static int uv_bau_max_concurrent __read_mostly;
-
+static int timeout_us;
static int nobau;
+static int baudisabled;
+static spinlock_t disable_lock;
+static cycles_t congested_cycles;
+
+/* tunables: */
+static int max_bau_concurrent = MAX_BAU_CONCURRENT;
+static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT;
+static int plugged_delay = PLUGGED_DELAY;
+static int plugsb4reset = PLUGSB4RESET;
+static int timeoutsb4reset = TIMEOUTSB4RESET;
+static int ipi_reset_limit = IPI_RESET_LIMIT;
+static int complete_threshold = COMPLETE_THRESHOLD;
+static int congested_response_us = CONGESTED_RESPONSE_US;
+static int congested_reps = CONGESTED_REPS;
+static int congested_period = CONGESTED_PERIOD;
+static struct dentry *tunables_dir;
+static struct dentry *tunables_file;
+
static int __init setup_nobau(char *arg)
{
nobau = 1;
@@ -52,10 +71,6 @@ static DEFINE_PER_CPU(struct ptc_stats, ptcstats);
static DEFINE_PER_CPU(struct bau_control, bau_control);
static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask);
-struct reset_args {
- int sender;
-};
-
/*
* Determine the first node on a uvhub. 'Nodes' are used for kernel
* memory allocation.
@@ -126,7 +141,7 @@ static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
struct ptc_stats *stat;
msg = mdp->msg;
- stat = &per_cpu(ptcstats, bcp->cpu);
+ stat = bcp->statp;
stat->d_retries++;
/*
* cancel any message from msg+1 to the retry itself
@@ -146,15 +161,14 @@ static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
slot2 = msg2 - mdp->va_queue_first;
mmr = uv_read_local_mmr
(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
- msg_res = ((msg2->sw_ack_vector << 8) |
- msg2->sw_ack_vector);
+ msg_res = msg2->sw_ack_vector;
/*
* This is a message retry; clear the resources held
* by the previous message only if they timed out.
* If it has not timed out we have an unexpected
* situation to report.
*/
- if (mmr & (msg_res << 8)) {
+ if (mmr & (msg_res << UV_SW_ACK_NPENDING)) {
/*
* is the resource timed out?
* make everyone ignore the cancelled message.
@@ -164,9 +178,9 @@ static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
cancel_count++;
uv_write_local_mmr(
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
- (msg_res << 8) | msg_res);
- } else
- printk(KERN_INFO "note bau retry: no effect\n");
+ (msg_res << UV_SW_ACK_NPENDING) |
+ msg_res);
+ }
}
}
if (!cancel_count)
@@ -190,7 +204,7 @@ static void uv_bau_process_message(struct msg_desc *mdp,
* This must be a normal message, or retry of a normal message
*/
msg = mdp->msg;
- stat = &per_cpu(ptcstats, bcp->cpu);
+ stat = bcp->statp;
if (msg->address == TLB_FLUSH_ALL) {
local_flush_tlb();
stat->d_alltlb++;
@@ -274,7 +288,7 @@ uv_do_reset(void *ptr)
bcp = &per_cpu(bau_control, smp_processor_id());
rap = (struct reset_args *)ptr;
- stat = &per_cpu(ptcstats, bcp->cpu);
+ stat = bcp->statp;
stat->d_resets++;
/*
@@ -302,13 +316,13 @@ uv_do_reset(void *ptr)
*/
mmr = uv_read_local_mmr
(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
- msg_res = ((msg->sw_ack_vector << 8) |
- msg->sw_ack_vector);
+ msg_res = msg->sw_ack_vector;
if (mmr & msg_res) {
stat->d_rcanceled++;
uv_write_local_mmr(
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
- msg_res);
+ (msg_res << UV_SW_ACK_NPENDING) |
+ msg_res);
}
}
}
@@ -386,17 +400,12 @@ static int uv_wait_completion(struct bau_desc *bau_desc,
unsigned long mmr_offset, int right_shift, int this_cpu,
struct bau_control *bcp, struct bau_control *smaster, long try)
{
- int relaxes = 0;
unsigned long descriptor_status;
- unsigned long mmr;
- unsigned long mask;
cycles_t ttime;
- cycles_t timeout_time;
- struct ptc_stats *stat = &per_cpu(ptcstats, this_cpu);
+ struct ptc_stats *stat = bcp->statp;
struct bau_control *hmaster;
hmaster = bcp->uvhub_master;
- timeout_time = get_cycles() + bcp->timeout_interval;
/* spin on the status MMR, waiting for it to go idle */
while ((descriptor_status = (((unsigned long)
@@ -423,7 +432,8 @@ 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;
}
@@ -435,26 +445,6 @@ static int uv_wait_completion(struct bau_desc *bau_desc,
* descriptor_status is still BUSY
*/
cpu_relax();
- relaxes++;
- if (relaxes >= 10000) {
- relaxes = 0;
- if (get_cycles() > timeout_time) {
- quiesce_local_uvhub(hmaster);
-
- /* single-thread the register change */
- spin_lock(&hmaster->masks_lock);
- mmr = uv_read_local_mmr(mmr_offset);
- mask = 0UL;
- mask |= (3UL < right_shift);
- mask = ~mask;
- mmr &= mask;
- uv_write_local_mmr(mmr_offset, mmr);
- spin_unlock(&hmaster->masks_lock);
- end_uvhub_quiesce(hmaster);
- stat->s_busy++;
- return FLUSH_GIVEUP;
- }
- }
}
}
bcp->conseccompletes++;
@@ -494,56 +484,116 @@ static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
return 1;
}
+/*
+ * Our retries are blocked by all destination swack resources being
+ * in use, and a timeout is pending. In that case hardware immediately
+ * returns the ERROR that looks like a destination timeout.
+ */
+static void
+destination_plugged(struct bau_desc *bau_desc, struct bau_control *bcp,
+ struct bau_control *hmaster, struct ptc_stats *stat)
+{
+ udelay(bcp->plugged_delay);
+ bcp->plugged_tries++;
+ if (bcp->plugged_tries >= bcp->plugsb4reset) {
+ bcp->plugged_tries = 0;
+ quiesce_local_uvhub(hmaster);
+ spin_lock(&hmaster->queue_lock);
+ uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
+ spin_unlock(&hmaster->queue_lock);
+ end_uvhub_quiesce(hmaster);
+ bcp->ipi_attempts++;
+ stat->s_resets_plug++;
+ }
+}
+
+static void
+destination_timeout(struct bau_desc *bau_desc, struct bau_control *bcp,
+ struct bau_control *hmaster, struct ptc_stats *stat)
+{
+ hmaster->max_bau_concurrent = 1;
+ bcp->timeout_tries++;
+ if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
+ bcp->timeout_tries = 0;
+ quiesce_local_uvhub(hmaster);
+ spin_lock(&hmaster->queue_lock);
+ uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
+ spin_unlock(&hmaster->queue_lock);
+ end_uvhub_quiesce(hmaster);
+ bcp->ipi_attempts++;
+ stat->s_resets_timeout++;
+ }
+}
+
+/*
+ * Completions are taking a very long time due to a congested numalink
+ * network.
+ */
+static void
+disable_for_congestion(struct bau_control *bcp, struct ptc_stats *stat)
+{
+ int tcpu;
+ struct bau_control *tbcp;
+
+ /* let only one cpu do this disabling */
+ spin_lock(&disable_lock);
+ if (!baudisabled && bcp->period_requests &&
+ ((bcp->period_time / bcp->period_requests) > congested_cycles)) {
+ /* it becomes this cpu's job to turn on the use of the
+ BAU again */
+ baudisabled = 1;
+ bcp->set_bau_off = 1;
+ bcp->set_bau_on_time = get_cycles() +
+ sec_2_cycles(bcp->congested_period);
+ stat->s_bau_disabled++;
+ for_each_present_cpu(tcpu) {
+ tbcp = &per_cpu(bau_control, tcpu);
+ tbcp->baudisabled = 1;
+ }
+ }
+ spin_unlock(&disable_lock);
+}
+
/**
* uv_flush_send_and_wait
*
* Send a broadcast and wait for it to complete.
*
- * The flush_mask contains the cpus the broadcast is to be sent to, plus
+ * The flush_mask contains the cpus the broadcast is to be sent to including
* cpus that are on the local uvhub.
*
- * Returns NULL if all flushing represented in the mask was done. The mask
- * is zeroed.
- * Returns @flush_mask if some remote flushing remains to be done. The
- * mask will have some bits still set, representing any cpus on the local
- * uvhub (not current cpu) and any on remote uvhubs if the broadcast failed.
+ * Returns 0 if all flushing represented in the mask was done.
+ * Returns 1 if it gives up entirely and the original cpu mask is to be
+ * returned to the kernel.
*/
-const struct cpumask *uv_flush_send_and_wait(struct bau_desc *bau_desc,
- struct cpumask *flush_mask,
- struct bau_control *bcp)
+int uv_flush_send_and_wait(struct bau_desc *bau_desc,
+ struct cpumask *flush_mask, struct bau_control *bcp)
{
int right_shift;
- int uvhub;
- int bit;
int completion_status = 0;
int seq_number = 0;
long try = 0;
int cpu = bcp->uvhub_cpu;
int this_cpu = bcp->cpu;
- int this_uvhub = bcp->uvhub;
unsigned long mmr_offset;
unsigned long index;
cycles_t time1;
cycles_t time2;
- struct ptc_stats *stat = &per_cpu(ptcstats, bcp->cpu);
+ cycles_t elapsed;
+ struct ptc_stats *stat = bcp->statp;
struct bau_control *smaster = bcp->socket_master;
struct bau_control *hmaster = bcp->uvhub_master;
- /*
- * Spin here while there are hmaster->max_concurrent or more active
- * descriptors. This is the per-uvhub 'throttle'.
- */
if (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
&hmaster->active_descriptor_count,
- hmaster->max_concurrent)) {
+ hmaster->max_bau_concurrent)) {
stat->s_throttles++;
do {
cpu_relax();
} while (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
&hmaster->active_descriptor_count,
- hmaster->max_concurrent));
+ hmaster->max_bau_concurrent));
}
-
while (hmaster->uvhub_quiesce)
cpu_relax();
@@ -557,23 +607,10 @@ const struct cpumask *uv_flush_send_and_wait(struct bau_desc *bau_desc,
}
time1 = get_cycles();
do {
- /*
- * Every message from any given cpu gets a unique message
- * sequence number. But retries use that same number.
- * Our message may have timed out at the destination because
- * all sw-ack resources are in use and there is a timeout
- * pending there. In that case, our last send never got
- * placed into the queue and we need to persist until it
- * does.
- *
- * Make any retry a type MSG_RETRY so that the destination will
- * free any resource held by a previous message from this cpu.
- */
if (try == 0) {
- /* use message type set by the caller the first time */
+ bau_desc->header.msg_type = MSG_REGULAR;
seq_number = bcp->message_number++;
} else {
- /* use RETRY type on all the rest; same sequence */
bau_desc->header.msg_type = MSG_RETRY;
stat->s_retry_messages++;
}
@@ -581,50 +618,17 @@ const struct cpumask *uv_flush_send_and_wait(struct bau_desc *bau_desc,
index = (1UL << UVH_LB_BAU_SB_ACTIVATION_CONTROL_PUSH_SHFT) |
bcp->uvhub_cpu;
bcp->send_message = get_cycles();
-
uv_write_local_mmr(UVH_LB_BAU_SB_ACTIVATION_CONTROL, index);
-
try++;
completion_status = uv_wait_completion(bau_desc, mmr_offset,
right_shift, this_cpu, bcp, smaster, try);
if (completion_status == FLUSH_RETRY_PLUGGED) {
- /*
- * Our retries may be blocked by all destination swack
- * resources being consumed, and a timeout pending. In
- * that case hardware immediately returns the ERROR
- * that looks like a destination timeout.
- */
- udelay(TIMEOUT_DELAY);
- bcp->plugged_tries++;
- if (bcp->plugged_tries >= PLUGSB4RESET) {
- bcp->plugged_tries = 0;
- quiesce_local_uvhub(hmaster);
- spin_lock(&hmaster->queue_lock);
- uv_reset_with_ipi(&bau_desc->distribution,
- this_cpu);
- spin_unlock(&hmaster->queue_lock);
- end_uvhub_quiesce(hmaster);
- bcp->ipi_attempts++;
- stat->s_resets_plug++;
- }
+ destination_plugged(bau_desc, bcp, hmaster, stat);
} else if (completion_status == FLUSH_RETRY_TIMEOUT) {
- hmaster->max_concurrent = 1;
- bcp->timeout_tries++;
- udelay(TIMEOUT_DELAY);
- if (bcp->timeout_tries >= TIMEOUTSB4RESET) {
- bcp->timeout_tries = 0;
- quiesce_local_uvhub(hmaster);
- spin_lock(&hmaster->queue_lock);
- uv_reset_with_ipi(&bau_desc->distribution,
- this_cpu);
- spin_unlock(&hmaster->queue_lock);
- end_uvhub_quiesce(hmaster);
- bcp->ipi_attempts++;
- stat->s_resets_timeout++;
- }
+ destination_timeout(bau_desc, bcp, hmaster, stat);
}
- if (bcp->ipi_attempts >= 3) {
+ if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
bcp->ipi_attempts = 0;
completion_status = FLUSH_GIVEUP;
break;
@@ -633,49 +637,36 @@ const struct cpumask *uv_flush_send_and_wait(struct bau_desc *bau_desc,
} while ((completion_status == FLUSH_RETRY_PLUGGED) ||
(completion_status == FLUSH_RETRY_TIMEOUT));
time2 = get_cycles();
-
- if ((completion_status == FLUSH_COMPLETE) && (bcp->conseccompletes > 5)
- && (hmaster->max_concurrent < hmaster->max_concurrent_constant))
- hmaster->max_concurrent++;
-
- /*
- * hold any cpu not timing out here; no other cpu currently held by
- * the 'throttle' should enter the activation code
- */
+ bcp->plugged_tries = 0;
+ bcp->timeout_tries = 0;
+ if ((completion_status == FLUSH_COMPLETE) &&
+ (bcp->conseccompletes > bcp->complete_threshold) &&
+ (hmaster->max_bau_concurrent <
+ hmaster->max_bau_concurrent_constant))
+ hmaster->max_bau_concurrent++;
while (hmaster->uvhub_quiesce)
cpu_relax();
atomic_dec(&hmaster->active_descriptor_count);
-
- /* guard against cycles wrap */
- if (time2 > time1)
- stat->s_time += (time2 - time1);
- else
- stat->s_requestor--; /* don't count this one */
+ if (time2 > time1) {
+ elapsed = time2 - time1;
+ stat->s_time += elapsed;
+ if ((completion_status == FLUSH_COMPLETE) && (try == 1)) {
+ bcp->period_requests++;
+ bcp->period_time += elapsed;
+ if ((elapsed > congested_cycles) &&
+ (bcp->period_requests > bcp->congested_reps)) {
+ disable_for_congestion(bcp, stat);
+ }
+ }
+ } else
+ stat->s_requestor--;
if (completion_status == FLUSH_COMPLETE && try > 1)
stat->s_retriesok++;
else if (completion_status == FLUSH_GIVEUP) {
- /*
- * Cause the caller to do an IPI-style TLB shootdown on
- * the target cpu's, all of which are still in the mask.
- */
stat->s_giveup++;
- return flush_mask;
- }
-
- /*
- * Success, so clear the remote cpu's from the mask so we don't
- * use the IPI method of shootdown on them.
- */
- for_each_cpu(bit, flush_mask) {
- uvhub = uv_cpu_to_blade_id(bit);
- if (uvhub == this_uvhub)
- continue;
- cpumask_clear_cpu(bit, flush_mask);
+ return 1;
}
- if (!cpumask_empty(flush_mask))
- return flush_mask;
-
- return NULL;
+ return 0;
}
/**
@@ -707,70 +698,89 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm,
unsigned long va, unsigned int cpu)
{
- int remotes;
int tcpu;
int uvhub;
int locals = 0;
+ int remotes = 0;
+ int hubs = 0;
struct bau_desc *bau_desc;
struct cpumask *flush_mask;
struct ptc_stats *stat;
struct bau_control *bcp;
+ struct bau_control *tbcp;
+ /* kernel was booted 'nobau' */
if (nobau)
return cpumask;
bcp = &per_cpu(bau_control, cpu);
+ stat = bcp->statp;
+
+ /* bau was disabled due to slow response */
+ if (bcp->baudisabled) {
+ /* the cpu that disabled it must re-enable it */
+ if (bcp->set_bau_off) {
+ if (get_cycles() >= bcp->set_bau_on_time) {
+ stat->s_bau_reenabled++;
+ baudisabled = 0;
+ for_each_present_cpu(tcpu) {
+ tbcp = &per_cpu(bau_control, tcpu);
+ tbcp->baudisabled = 0;
+ tbcp->period_requests = 0;
+ tbcp->period_time = 0;
+ }
+ }
+ }
+ return cpumask;
+ }
+
/*
* Each sending cpu has a per-cpu mask which it fills from the caller's
- * cpu mask. Only remote cpus are converted to uvhubs and copied.
+ * cpu mask. All cpus are converted to uvhubs and copied to the
+ * activation descriptor.
*/
flush_mask = (struct cpumask *)per_cpu(uv_flush_tlb_mask, cpu);
- /*
- * copy cpumask to flush_mask, removing current cpu
- * (current cpu should already have been flushed by the caller and
- * should never be returned if we return flush_mask)
- */
+ /* don't actually do a shootdown of the local cpu */
cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu));
if (cpu_isset(cpu, *cpumask))
- locals++; /* current cpu was targeted */
+ stat->s_ntargself++;
bau_desc = bcp->descriptor_base;
bau_desc += UV_ITEMS_PER_DESCRIPTOR * bcp->uvhub_cpu;
-
bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
- remotes = 0;
+
+ /* cpu statistics */
for_each_cpu(tcpu, flush_mask) {
uvhub = uv_cpu_to_blade_id(tcpu);
- if (uvhub == bcp->uvhub) {
- locals++;
- continue;
- }
bau_uvhub_set(uvhub, &bau_desc->distribution);
- remotes++;
- }
- if (remotes == 0) {
- /*
- * No off_hub flushing; return status for local hub.
- * Return the caller's mask if all were local (the current
- * cpu may be in that mask).
- */
- if (locals)
- return cpumask;
+ if (uvhub == bcp->uvhub)
+ locals++;
else
- return NULL;
+ remotes++;
}
- stat = &per_cpu(ptcstats, cpu);
+ if ((locals + remotes) == 0)
+ return NULL;
stat->s_requestor++;
- stat->s_ntargcpu += remotes;
+ stat->s_ntargcpu += remotes + locals;
+ stat->s_ntargremotes += remotes;
+ stat->s_ntarglocals += locals;
remotes = bau_uvhub_weight(&bau_desc->distribution);
- stat->s_ntarguvhub += remotes;
- if (remotes >= 16)
+
+ /* uvhub statistics */
+ hubs = bau_uvhub_weight(&bau_desc->distribution);
+ if (locals) {
+ stat->s_ntarglocaluvhub++;
+ stat->s_ntargremoteuvhub += (hubs - 1);
+ } else
+ stat->s_ntargremoteuvhub += hubs;
+ stat->s_ntarguvhub += hubs;
+ if (hubs >= 16)
stat->s_ntarguvhub16++;
- else if (remotes >= 8)
+ else if (hubs >= 8)
stat->s_ntarguvhub8++;
- else if (remotes >= 4)
+ else if (hubs >= 4)
stat->s_ntarguvhub4++;
- else if (remotes >= 2)
+ else if (hubs >= 2)
stat->s_ntarguvhub2++;
else
stat->s_ntarguvhub1++;
@@ -779,10 +789,13 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
bau_desc->payload.sending_cpu = cpu;
/*
- * uv_flush_send_and_wait returns null if all cpu's were messaged, or
- * the adjusted flush_mask if any cpu's were not messaged.
+ * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
+ * or 1 if it gave up and the original cpumask should be returned.
*/
- return uv_flush_send_and_wait(bau_desc, flush_mask, bcp);
+ if (!uv_flush_send_and_wait(bau_desc, flush_mask, bcp))
+ return NULL;
+ else
+ return cpumask;
}
/*
@@ -810,7 +823,7 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
time_start = get_cycles();
bcp = &per_cpu(bau_control, smp_processor_id());
- stat = &per_cpu(ptcstats, smp_processor_id());
+ stat = bcp->statp;
msgdesc.va_queue_first = bcp->va_queue_first;
msgdesc.va_queue_last = bcp->va_queue_last;
msg = bcp->bau_msg_head;
@@ -908,12 +921,12 @@ 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;
}
@@ -931,15 +944,19 @@ static int uv_ptc_seq_show(struct seq_file *file, void *data)
if (!cpu) {
seq_printf(file,
- "# cpu sent stime numuvhubs numuvhubs16 numuvhubs8 ");
+ "# cpu sent stime self locals remotes ncpus localhub ");
seq_printf(file,
- "numuvhubs4 numuvhubs2 numuvhubs1 numcpus dto ");
+ "remotehub numuvhubs numuvhubs16 numuvhubs8 ");
+ seq_printf(file,
+ "numuvhubs4 numuvhubs2 numuvhubs1 dto ");
seq_printf(file,
"retries rok resetp resett giveup sto bz throt ");
seq_printf(file,
"sw_ack recv rtime all ");
seq_printf(file,
- "one mult none retry canc nocan reset rcan\n");
+ "one mult none retry canc nocan reset rcan ");
+ seq_printf(file,
+ "disable enable\n");
}
if (cpu < num_possible_cpus() && cpu_online(cpu)) {
stat = &per_cpu(ptcstats, cpu);
@@ -947,18 +964,23 @@ static int uv_ptc_seq_show(struct seq_file *file, void *data)
seq_printf(file,
"cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
cpu, stat->s_requestor, cycles_2_us(stat->s_time),
- stat->s_ntarguvhub, stat->s_ntarguvhub16,
+ stat->s_ntargself, stat->s_ntarglocals,
+ stat->s_ntargremotes, stat->s_ntargcpu,
+ stat->s_ntarglocaluvhub, stat->s_ntargremoteuvhub,
+ stat->s_ntarguvhub, stat->s_ntarguvhub16);
+ seq_printf(file, "%ld %ld %ld %ld %ld ",
stat->s_ntarguvhub8, stat->s_ntarguvhub4,
stat->s_ntarguvhub2, stat->s_ntarguvhub1,
- stat->s_ntargcpu, stat->s_dtimeout);
+ stat->s_dtimeout);
seq_printf(file, "%ld %ld %ld %ld %ld %ld %ld %ld ",
stat->s_retry_messages, stat->s_retriesok,
stat->s_resets_plug, stat->s_resets_timeout,
stat->s_giveup, stat->s_stimeout,
stat->s_busy, stat->s_throttles);
+
/* destination side statistics */
seq_printf(file,
- "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n",
+ "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
uv_read_global_mmr64(uv_cpu_to_pnode(cpu),
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE),
stat->d_requestee, cycles_2_us(stat->d_time),
@@ -966,15 +988,36 @@ static int uv_ptc_seq_show(struct seq_file *file, void *data)
stat->d_nomsg, stat->d_retries, stat->d_canceled,
stat->d_nocanceled, stat->d_resets,
stat->d_rcanceled);
+ seq_printf(file, "%ld %ld\n",
+ stat->s_bau_disabled, stat->s_bau_reenabled);
}
return 0;
}
/*
+ * Display the tunables thru debugfs
+ */
+static ssize_t tunables_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ char buf[300];
+ int ret;
+
+ ret = snprintf(buf, 300, "%s %s %s\n%d %d %d %d %d %d %d %d %d\n",
+ "max_bau_concurrent plugged_delay plugsb4reset",
+ "timeoutsb4reset ipi_reset_limit complete_threshold",
+ "congested_response_us congested_reps congested_period",
+ max_bau_concurrent, plugged_delay, plugsb4reset,
+ timeoutsb4reset, ipi_reset_limit, complete_threshold,
+ congested_response_us, congested_reps, congested_period);
+
+ return simple_read_from_buffer(userbuf, count, ppos, buf, ret);
+}
+
+/*
* -1: resetf the statistics
* 0: display meaning of the statistics
- * >0: maximum concurrent active descriptors per uvhub (throttle)
*/
static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
size_t count, loff_t *data)
@@ -983,7 +1026,6 @@ static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
long input_arg;
char optstr[64];
struct ptc_stats *stat;
- struct bau_control *bcp;
if (count == 0 || count > sizeof(optstr))
return -EINVAL;
@@ -1059,29 +1101,158 @@ static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
"reset: number of ipi-style reset requests processed\n");
printk(KERN_DEBUG
"rcan: number messages canceled by reset requests\n");
+ printk(KERN_DEBUG
+ "disable: number times use of the BAU was disabled\n");
+ printk(KERN_DEBUG
+ "enable: number times use of the BAU was re-enabled\n");
} else if (input_arg == -1) {
for_each_present_cpu(cpu) {
stat = &per_cpu(ptcstats, cpu);
memset(stat, 0, sizeof(struct ptc_stats));
}
- } else {
- uv_bau_max_concurrent = input_arg;
- bcp = &per_cpu(bau_control, smp_processor_id());
- if (uv_bau_max_concurrent < 1 ||
- uv_bau_max_concurrent > bcp->cpus_in_uvhub) {
- printk(KERN_DEBUG
- "Error: BAU max concurrent %d; %d is invalid\n",
- bcp->max_concurrent, uv_bau_max_concurrent);
- return -EINVAL;
- }
- printk(KERN_DEBUG "Set BAU max concurrent:%d\n",
- uv_bau_max_concurrent);
- for_each_present_cpu(cpu) {
- bcp = &per_cpu(bau_control, cpu);
- bcp->max_concurrent = uv_bau_max_concurrent;
+ }
+
+ return count;
+}
+
+static int local_atoi(const char *name)
+{
+ int val = 0;
+
+ for (;; name++) {
+ switch (*name) {
+ case '0' ... '9':
+ val = 10*val+(*name-'0');
+ break;
+ default:
+ return val;
}
}
+}
+
+/*
+ * set the tunables
+ * 0 values reset them to defaults
+ */
+static ssize_t tunables_write(struct file *file, const char __user *user,
+ size_t count, loff_t *data)
+{
+ int cpu;
+ int cnt = 0;
+ int val;
+ char *p;
+ char *q;
+ char instr[64];
+ struct bau_control *bcp;
+
+ if (count == 0 || count > sizeof(instr)-1)
+ return -EINVAL;
+ if (copy_from_user(instr, user, count))
+ return -EFAULT;
+
+ instr[count] = '\0';
+ /* count the fields */
+ p = instr + strspn(instr, WHITESPACE);
+ q = p;
+ for (; *p; p = q + strspn(q, WHITESPACE)) {
+ q = p + strcspn(p, WHITESPACE);
+ cnt++;
+ if (q == p)
+ break;
+ }
+ if (cnt != 9) {
+ printk(KERN_INFO "bau tunable error: should be 9 numbers\n");
+ return -EINVAL;
+ }
+ p = instr + strspn(instr, WHITESPACE);
+ q = p;
+ for (cnt = 0; *p; p = q + strspn(q, WHITESPACE), cnt++) {
+ q = p + strcspn(p, WHITESPACE);
+ val = local_atoi(p);
+ switch (cnt) {
+ case 0:
+ if (val == 0) {
+ max_bau_concurrent = MAX_BAU_CONCURRENT;
+ max_bau_concurrent_constant =
+ MAX_BAU_CONCURRENT;
+ continue;
+ }
+ bcp = &per_cpu(bau_control, smp_processor_id());
+ if (val < 1 || val > bcp->cpus_in_uvhub) {
+ printk(KERN_DEBUG
+ "Error: BAU max concurrent %d is invalid\n",
+ val);
+ return -EINVAL;
+ }
+ max_bau_concurrent = val;
+ max_bau_concurrent_constant = val;
+ continue;
+ case 1:
+ if (val == 0)
+ plugged_delay = PLUGGED_DELAY;
+ else
+ plugged_delay = val;
+ continue;
+ case 2:
+ if (val == 0)
+ plugsb4reset = PLUGSB4RESET;
+ else
+ plugsb4reset = val;
+ continue;
+ case 3:
+ if (val == 0)
+ timeoutsb4reset = TIMEOUTSB4RESET;
+ else
+ timeoutsb4reset = val;
+ continue;
+ case 4:
+ if (val == 0)
+ ipi_reset_limit = IPI_RESET_LIMIT;
+ else
+ ipi_reset_limit = val;
+ continue;
+ case 5:
+ if (val == 0)
+ complete_threshold = COMPLETE_THRESHOLD;
+ else
+ complete_threshold = val;
+ continue;
+ case 6:
+ if (val == 0)
+ congested_response_us = CONGESTED_RESPONSE_US;
+ else
+ congested_response_us = val;
+ continue;
+ case 7:
+ if (val == 0)
+ congested_reps = CONGESTED_REPS;
+ else
+ congested_reps = val;
+ continue;
+ case 8:
+ if (val == 0)
+ congested_period = CONGESTED_PERIOD;
+ else
+ congested_period = val;
+ continue;
+ }
+ if (q == p)
+ break;
+ }
+ for_each_present_cpu(cpu) {
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->max_bau_concurrent = max_bau_concurrent;
+ bcp->max_bau_concurrent_constant = max_bau_concurrent;
+ bcp->plugged_delay = plugged_delay;
+ bcp->plugsb4reset = plugsb4reset;
+ bcp->timeoutsb4reset = timeoutsb4reset;
+ bcp->ipi_reset_limit = ipi_reset_limit;
+ bcp->complete_threshold = complete_threshold;
+ bcp->congested_response_us = congested_response_us;
+ bcp->congested_reps = congested_reps;
+ bcp->congested_period = congested_period;
+ }
return count;
}
@@ -1097,6 +1268,11 @@ static int uv_ptc_proc_open(struct inode *inode, struct file *file)
return seq_open(file, &uv_ptc_seq_ops);
}
+static int tunables_open(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
static const struct file_operations proc_uv_ptc_operations = {
.open = uv_ptc_proc_open,
.read = seq_read,
@@ -1105,6 +1281,12 @@ static const struct file_operations proc_uv_ptc_operations = {
.release = seq_release,
};
+static const struct file_operations tunables_fops = {
+ .open = tunables_open,
+ .read = tunables_read,
+ .write = tunables_write,
+};
+
static int __init uv_ptc_init(void)
{
struct proc_dir_entry *proc_uv_ptc;
@@ -1119,6 +1301,20 @@ static int __init uv_ptc_init(void)
UV_PTC_BASENAME);
return -EINVAL;
}
+
+ tunables_dir = debugfs_create_dir(UV_BAU_TUNABLES_DIR, NULL);
+ if (!tunables_dir) {
+ printk(KERN_ERR "unable to create debugfs directory %s\n",
+ UV_BAU_TUNABLES_DIR);
+ return -EINVAL;
+ }
+ tunables_file = debugfs_create_file(UV_BAU_TUNABLES_FILE, 0600,
+ tunables_dir, NULL, &tunables_fops);
+ if (!tunables_file) {
+ printk(KERN_ERR "unable to create debugfs file %s\n",
+ UV_BAU_TUNABLES_FILE);
+ return -EINVAL;
+ }
return 0;
}
@@ -1259,15 +1455,44 @@ static void __init uv_init_uvhub(int uvhub, int 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
*/
static void uv_init_per_cpu(int nuvhubs)
{
- int i, j, k;
+ int i;
int cpu;
int pnode;
int uvhub;
short socket = 0;
+ unsigned short socket_mask;
+ unsigned int uvhub_mask;
struct bau_control *bcp;
struct uvhub_desc *bdp;
struct socket_desc *sdp;
@@ -1278,7 +1503,7 @@ static void uv_init_per_cpu(int nuvhubs)
short cpu_number[16];
};
struct uvhub_desc {
- short num_sockets;
+ unsigned short socket_mask;
short num_cpus;
short uvhub;
short pnode;
@@ -1286,57 +1511,83 @@ 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));
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
memset(bcp, 0, sizeof(struct bau_control));
- spin_lock_init(&bcp->masks_lock);
- bcp->max_concurrent = uv_bau_max_concurrent;
pnode = uv_cpu_hub_info(cpu)->pnode;
uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
+ uvhub_mask |= (1 << uvhub);
bdp = &uvhub_descs[uvhub];
bdp->num_cpus++;
bdp->uvhub = uvhub;
bdp->pnode = pnode;
- /* time interval to catch a hardware stay-busy bug */
- bcp->timeout_interval = millisec_2_cycles(3);
- /* kludge: assume uv_hub.h is constant */
- socket = (cpu_physical_id(cpu)>>5)&1;
- if (socket >= bdp->num_sockets)
- bdp->num_sockets = socket+1;
+ /* kludge: 'assuming' one node per socket, and assuming that
+ disabling a socket just leaves a gap in node numbers */
+ socket = (cpu_to_node(cpu) & 1);;
+ bdp->socket_mask |= (1 << socket);
sdp = &bdp->socket[socket];
sdp->cpu_number[sdp->num_cpus] = cpu;
sdp->num_cpus++;
}
- socket = 0;
- for_each_possible_blade(uvhub) {
+ uvhub = 0;
+ while (uvhub_mask) {
+ if (!(uvhub_mask & 1))
+ goto nexthub;
bdp = &uvhub_descs[uvhub];
- for (i = 0; i < bdp->num_sockets; i++) {
- sdp = &bdp->socket[i];
- for (j = 0; j < sdp->num_cpus; j++) {
- cpu = sdp->cpu_number[j];
+ socket_mask = bdp->socket_mask;
+ socket = 0;
+ while (socket_mask) {
+ if (!(socket_mask & 1))
+ goto nextsocket;
+ sdp = &bdp->socket[socket];
+ for (i = 0; i < sdp->num_cpus; i++) {
+ cpu = sdp->cpu_number[i];
bcp = &per_cpu(bau_control, cpu);
bcp->cpu = cpu;
- if (j == 0) {
+ if (i == 0) {
smaster = bcp;
- if (i == 0)
+ if (socket == 0)
hmaster = bcp;
}
bcp->cpus_in_uvhub = bdp->num_cpus;
bcp->cpus_in_socket = sdp->num_cpus;
bcp->socket_master = smaster;
+ bcp->uvhub = bdp->uvhub;
bcp->uvhub_master = hmaster;
- for (k = 0; k < DEST_Q_SIZE; k++)
- bcp->socket_acknowledge_count[k] = 0;
- bcp->uvhub_cpu =
- uv_cpu_hub_info(cpu)->blade_processor_id;
+ bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->
+ blade_processor_id;
}
+nextsocket:
socket++;
+ socket_mask = (socket_mask >> 1);
}
+nexthub:
+ uvhub++;
+ uvhub_mask = (uvhub_mask >> 1);
}
kfree(uvhub_descs);
+ for_each_present_cpu(cpu) {
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->baudisabled = 0;
+ bcp->statp = &per_cpu(ptcstats, cpu);
+ /* time interval to catch a hardware stay-busy bug */
+ bcp->timeout_interval = microsec_2_cycles(2*timeout_us);
+ bcp->max_bau_concurrent = max_bau_concurrent;
+ bcp->max_bau_concurrent_constant = max_bau_concurrent;
+ bcp->plugged_delay = plugged_delay;
+ bcp->plugsb4reset = plugsb4reset;
+ bcp->timeoutsb4reset = timeoutsb4reset;
+ bcp->ipi_reset_limit = ipi_reset_limit;
+ bcp->complete_threshold = complete_threshold;
+ bcp->congested_response_us = congested_response_us;
+ bcp->congested_reps = congested_reps;
+ bcp->congested_period = congested_period;
+ }
}
/*
@@ -1361,10 +1612,11 @@ static int __init uv_bau_init(void)
zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu),
GFP_KERNEL, cpu_to_node(cur_cpu));
- uv_bau_max_concurrent = MAX_BAU_CONCURRENT;
uv_nshift = uv_hub_info->m_val;
uv_mmask = (1UL << uv_hub_info->m_val) - 1;
nuvhubs = uv_num_possible_blades();
+ spin_lock_init(&disable_lock);
+ congested_cycles = microsec_2_cycles(congested_response_us);
uv_init_per_cpu(nuvhubs);
@@ -1383,15 +1635,19 @@ static int __init uv_bau_init(void)
alloc_intr_gate(vector, uv_bau_message_intr1);
for_each_possible_blade(uvhub) {
- pnode = uv_blade_to_pnode(uvhub);
- /* INIT the bau */
- uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_ACTIVATION_CONTROL,
- ((unsigned long)1 << 63));
- mmr = 1; /* should be 1 to broadcast to both sockets */
- uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST, mmr);
+ if (uv_blade_nr_possible_cpus(uvhub)) {
+ pnode = uv_blade_to_pnode(uvhub);
+ /* INIT the bau */
+ uv_write_global_mmr64(pnode,
+ UVH_LB_BAU_SB_ACTIVATION_CONTROL,
+ ((unsigned long)1 << 63));
+ mmr = 1; /* should be 1 to broadcast to both sockets */
+ uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST,
+ mmr);
+ }
}
return 0;
}
core_initcall(uv_bau_init);
-core_initcall(uv_ptc_init);
+fs_initcall(uv_ptc_init);

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