*/
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
+#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
struct bau_payload_queue_entry *va_queue_last;
};
-#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x000000000bUL
-
-static int uv_bau_max_concurrent __read_mostly;
-
+/* 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;
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;
* 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;
}
return 1;
}
+/*
+ * 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
*
unsigned long index;
cycles_t time1;
cycles_t time2;
+ cycles_t elapsed;
struct ptc_stats *stat = &per_cpu(ptcstats, bcp->cpu);
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
+ * Spin here while there are hmaster->max_bau_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)
* that case hardware immediately returns the ERROR
* that looks like a destination timeout.
*/
- udelay(TIMEOUT_DELAY);
+ udelay(bcp->plugged_delay);
bcp->plugged_tries++;
- if (bcp->plugged_tries >= PLUGSB4RESET) {
+ if (bcp->plugged_tries >= bcp->plugsb4reset) {
bcp->plugged_tries = 0;
quiesce_local_uvhub(hmaster);
spin_lock(&hmaster->queue_lock);
stat->s_resets_plug++;
}
} else if (completion_status == FLUSH_RETRY_TIMEOUT) {
- hmaster->max_concurrent = 1;
+ hmaster->max_bau_concurrent = 1;
bcp->timeout_tries++;
udelay(TIMEOUT_DELAY);
- if (bcp->timeout_tries >= TIMEOUTSB4RESET) {
+ if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
bcp->timeout_tries = 0;
quiesce_local_uvhub(hmaster);
spin_lock(&hmaster->queue_lock);
stat->s_resets_timeout++;
}
}
- if (bcp->ipi_attempts >= 3) {
+ if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
bcp->ipi_attempts = 0;
completion_status = FLUSH_GIVEUP;
break;
(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++;
+ 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++;
/*
* hold any cpu not timing out here; no other cpu currently held by
atomic_dec(&hmaster->active_descriptor_count);
/* guard against cycles wrap */
- if (time2 > time1)
- stat->s_time += (time2 - time1);
- else
+ 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--; /* don't count this one */
if (completion_status == FLUSH_COMPLETE && try > 1)
stat->s_retriesok++;
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 = &per_cpu(ptcstats, cpu);
+
+ /* 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.
else
return NULL;
}
- stat = &per_cpu(ptcstats, cpu);
stat->s_requestor++;
stat->s_ntargcpu += remotes;
remotes = bau_uvhub_weight(&bau_desc->distribution);
}
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;
}
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);
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),
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)
long input_arg;
char optstr[64];
struct ptc_stats *stat;
- struct bau_control *bcp;
if (count == 0 || count > sizeof(optstr))
return -EINVAL;
"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;
}
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,
.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;
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;
}
((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
*/
};
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));
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;
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)
}
}
kfree(uvhub_descs);
+ for_each_present_cpu(cpu) {
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->baudisabled = 0;
+ /* 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;
+ }
}
/*
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;
+ max_bau_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);
return 0;
}
core_initcall(uv_bau_init);
-core_initcall(uv_ptc_init);
+fs_initcall(uv_ptc_init);
git.openpandora.org / pandora-kernel.git / blobdiff