Google Git
Sign in
gem5 / arm / linux-arm64-legacy / 13588209aa90d9c8e502750fc86160314555612f / . / arch / x86 / platform / uv / tlb_uv.c
blob: c58e0ea39ef5facdaa630fa8138cb77fb530aa06 [file] [log] [blame]
/*
* SGI UltraViolet TLB flush routines.
*
* (c) 2008-2010 Cliff Wickman <cpw@sgi.com>, SGI.
*
* This code is released under the GNU General Public License version 2 or
* later.
*/
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <asm/mmu_context.h>
#include <asm/uv/uv.h>
#include <asm/uv/uv_mmrs.h>
#include <asm/uv/uv_hub.h>
#include <asm/uv/uv_bau.h>
#include <asm/apic.h>
#include <asm/idle.h>
#include <asm/tsc.h>
#include <asm/irq_vectors.h>
#include <asm/timer.h>
/* 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;
return 0;
}
early_param("nobau", setup_nobau);
/* base pnode in this partition */
static int uv_partition_base_pnode __read_mostly;
/* position of pnode (which is nasid>>1): */
static int uv_nshift __read_mostly;
static unsigned long uv_mmask __read_mostly;
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);
/*
* Determine the first node on a uvhub. 'Nodes' are used for kernel
* memory allocation.
*/
static int __init uvhub_to_first_node(int uvhub)
{
int node, b;
for_each_online_node(node) {
b = uv_node_to_blade_id(node);
if (uvhub == b)
return node;
}
return -1;
}
/*
* Determine the apicid of the first cpu on a uvhub.
*/
static int __init uvhub_to_first_apicid(int uvhub)
{
int cpu;
for_each_present_cpu(cpu)
if (uvhub == uv_cpu_to_blade_id(cpu))
return per_cpu(x86_cpu_to_apicid, cpu);
return -1;
}
/*
* Free a software acknowledge hardware resource by clearing its Pending
* bit. This will return a reply to the sender.
* If the message has timed out, a reply has already been sent by the
* hardware but the resource has not been released. In that case our
* clear of the Timeout bit (as well) will free the resource. No reply will
* be sent (the hardware will only do one reply per message).
*/
static inline void uv_reply_to_message(struct msg_desc *mdp,
struct bau_control *bcp)
{
unsigned long dw;
struct bau_payload_queue_entry *msg;
msg = mdp->msg;
if (!msg->canceled) {
dw = (msg->sw_ack_vector << UV_SW_ACK_NPENDING) |
msg->sw_ack_vector;
uv_write_local_mmr(
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw);
}
msg->replied_to = 1;
msg->sw_ack_vector = 0;
}
/*
* Process the receipt of a RETRY message
*/
static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
struct bau_control *bcp)
{
int i;
int cancel_count = 0;
int slot2;
unsigned long msg_res;
unsigned long mmr = 0;
struct bau_payload_queue_entry *msg;
struct bau_payload_queue_entry *msg2;
struct ptc_stats *stat;
msg = mdp->msg;
stat = bcp->statp;
stat->d_retries++;
/*
* cancel any message from msg+1 to the retry itself
*/
for (msg2 = msg+1, i = 0; i < DEST_Q_SIZE; msg2++, i++) {
if (msg2 > mdp->va_queue_last)
msg2 = mdp->va_queue_first;
if (msg2 == msg)
break;
/* same conditions for cancellation as uv_do_reset */
if ((msg2->replied_to == 0) && (msg2->canceled == 0) &&
(msg2->sw_ack_vector) && ((msg2->sw_ack_vector &
msg->sw_ack_vector) == 0) &&
(msg2->sending_cpu == msg->sending_cpu) &&
(msg2->msg_type != MSG_NOOP)) {
slot2 = msg2 - mdp->va_queue_first;
mmr = uv_read_local_mmr
(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
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 << UV_SW_ACK_NPENDING)) {
/*
* is the resource timed out?
* make everyone ignore the cancelled message.
*/
msg2->canceled = 1;
stat->d_canceled++;
cancel_count++;
uv_write_local_mmr(
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
(msg_res << UV_SW_ACK_NPENDING) |
msg_res);
}
}
}
if (!cancel_count)
stat->d_nocanceled++;
}
/*
* Do all the things a cpu should do for a TLB shootdown message.
* Other cpu's may come here at the same time for this message.
*/
static void uv_bau_process_message(struct msg_desc *mdp,
struct bau_control *bcp)
{
int msg_ack_count;
short socket_ack_count = 0;
struct ptc_stats *stat;
struct bau_payload_queue_entry *msg;
struct bau_control *smaster = bcp->socket_master;
/*
* This must be a normal message, or retry of a normal message
*/
msg = mdp->msg;
stat = bcp->statp;
if (msg->address == TLB_FLUSH_ALL) {
local_flush_tlb();
stat->d_alltlb++;
} else {
__flush_tlb_one(msg->address);
stat->d_onetlb++;
}
stat->d_requestee++;
/*
* One cpu on each uvhub has the additional job on a RETRY
* of releasing the resource held by the message that is
* being retried. That message is identified by sending
* cpu number.
*/
if (msg->msg_type == MSG_RETRY && bcp == bcp->uvhub_master)
uv_bau_process_retry_msg(mdp, bcp);
/*
* This is a sw_ack message, so we have to reply to it.
* Count each responding cpu on the socket. This avoids
* pinging the count's cache line back and forth between
* the sockets.
*/
socket_ack_count = atomic_add_short_return(1, (struct atomic_short *)
&smaster->socket_acknowledge_count[mdp->msg_slot]);
if (socket_ack_count == bcp->cpus_in_socket) {
/*
* Both sockets dump their completed count total into
* the message's count.
*/
smaster->socket_acknowledge_count[mdp->msg_slot] = 0;
msg_ack_count = atomic_add_short_return(socket_ack_count,
(struct atomic_short *)&msg->acknowledge_count);
if (msg_ack_count == bcp->cpus_in_uvhub) {
/*
* All cpus in uvhub saw it; reply
*/
uv_reply_to_message(mdp, bcp);
}
}
return;
}
/*
* Determine the first cpu on a uvhub.
*/
static int uvhub_to_first_cpu(int uvhub)
{
int cpu;
for_each_present_cpu(cpu)
if (uvhub == uv_cpu_to_blade_id(cpu))
return cpu;
return -1;
}
/*
* Last resort when we get a large number of destination timeouts is
* to clear resources held by a given cpu.
* Do this with IPI so that all messages in the BAU message queue
* can be identified by their nonzero sw_ack_vector field.
*
* This is entered for a single cpu on the uvhub.
* The sender want's this uvhub to free a specific message's
* sw_ack resources.
*/
static void
uv_do_reset(void *ptr)
{
int i;
int slot;
int count = 0;
unsigned long mmr;
unsigned long msg_res;
struct bau_control *bcp;
struct reset_args *rap;
struct bau_payload_queue_entry *msg;
struct ptc_stats *stat;
bcp = &per_cpu(bau_control, smp_processor_id());
rap = (struct reset_args *)ptr;
stat = bcp->statp;
stat->d_resets++;
/*
* We're looking for the given sender, and
* will free its sw_ack resource.
* If all cpu's finally responded after the timeout, its
* message 'replied_to' was set.
*/
for (msg = bcp->va_queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) {
/* uv_do_reset: same conditions for cancellation as
uv_bau_process_retry_msg() */
if ((msg->replied_to == 0) &&
(msg->canceled == 0) &&
(msg->sending_cpu == rap->sender) &&
(msg->sw_ack_vector) &&
(msg->msg_type != MSG_NOOP)) {
/*
* make everyone else ignore this message
*/
msg->canceled = 1;
slot = msg - bcp->va_queue_first;
count++;
/*
* only reset the resource if it is still pending
*/
mmr = uv_read_local_mmr
(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
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 << UV_SW_ACK_NPENDING) |
msg_res);
}
}
}
return;
}
/*
* Use IPI to get all target uvhubs to release resources held by
* a given sending cpu number.
*/
static void uv_reset_with_ipi(struct bau_target_uvhubmask *distribution,
int sender)
{
int uvhub;
int cpu;
cpumask_t mask;
struct reset_args reset_args;
reset_args.sender = sender;
cpus_clear(mask);
/* find a single cpu for each uvhub in this distribution mask */
for (uvhub = 0;
uvhub < sizeof(struct bau_target_uvhubmask) * BITSPERBYTE;
uvhub++) {
if (!bau_uvhub_isset(uvhub, distribution))
continue;
/* find a cpu for this uvhub */
cpu = uvhub_to_first_cpu(uvhub);
cpu_set(cpu, mask);
}
/* IPI all cpus; Preemption is already disabled */
smp_call_function_many(&mask, uv_do_reset, (void *)&reset_args, 1);
return;
}
static inline unsigned long
cycles_2_us(unsigned long long cyc)
{
unsigned long long ns;
unsigned long us;
ns = (cyc * per_cpu(cyc2ns, smp_processor_id()))
>> CYC2NS_SCALE_FACTOR;
us = ns / 1000;
return us;
}
/*
* wait for all cpus on this hub to finish their sends and go quiet
* leaves uvhub_quiesce set so that no new broadcasts are started by
* bau_flush_send_and_wait()
*/
static inline void
quiesce_local_uvhub(struct bau_control *hmaster)
{
atomic_add_short_return(1, (struct atomic_short *)
&hmaster->uvhub_quiesce);
}
/*
* mark this quiet-requestor as done
*/
static inline void
end_uvhub_quiesce(struct bau_control *hmaster)
{
atomic_add_short_return(-1, (struct atomic_short *)
&hmaster->uvhub_quiesce);
}
/*
* Wait for completion of a broadcast software ack message
* return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
*/
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)
{
unsigned long descriptor_status;
cycles_t ttime;
struct ptc_stats *stat = bcp->statp;
struct bau_control *hmaster;
hmaster = bcp->uvhub_master;
/* spin on the status MMR, waiting for it to go idle */
while ((descriptor_status = (((unsigned long)
uv_read_local_mmr(mmr_offset) >>
right_shift) & UV_ACT_STATUS_MASK)) !=
DESC_STATUS_IDLE) {
/*
* Our software ack messages may be blocked because there are
* no swack resources available. As long as none of them
* has timed out hardware will NACK our message and its
* state will stay IDLE.
*/
if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) {
stat->s_stimeout++;
return FLUSH_GIVEUP;
} else if (descriptor_status ==
DESC_STATUS_DESTINATION_TIMEOUT) {
stat->s_dtimeout++;
ttime = get_cycles();
/*
* Our retries may be blocked by all destination
* swack resources being consumed, and a timeout
* pending. In that case hardware returns the
* ERROR that looks like a destination timeout.
*/
if (cycles_2_us(ttime - bcp->send_message) <
timeout_us) {
bcp->conseccompletes = 0;
return FLUSH_RETRY_PLUGGED;
}
bcp->conseccompletes = 0;
return FLUSH_RETRY_TIMEOUT;
} else {
/*
* descriptor_status is still BUSY
*/
cpu_relax();
}
}
bcp->conseccompletes++;
return FLUSH_COMPLETE;
}
static inline cycles_t
sec_2_cycles(unsigned long sec)
{
unsigned long ns;
cycles_t cyc;
ns = sec * 1000000000;
cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
return cyc;
}
/*
* conditionally add 1 to *v, unless *v is >= u
* return 0 if we cannot add 1 to *v because it is >= u
* return 1 if we can add 1 to *v because it is < u
* the add is atomic
*
* This is close to atomic_add_unless(), but this allows the 'u' value
* to be lowered below the current 'v'. atomic_add_unless can only stop
* on equal.
*/
static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
{
spin_lock(lock);
if (atomic_read(v) >= u) {
spin_unlock(lock);
return 0;
}
atomic_inc(v);
spin_unlock(lock);
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 including
* cpus that are on the local uvhub.
*
* 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.
*/
int uv_flush_send_and_wait(struct bau_desc *bau_desc,
struct cpumask *flush_mask, struct bau_control *bcp)
{
int right_shift;
int completion_status = 0;
int seq_number = 0;
long try = 0;
int cpu = bcp->uvhub_cpu;
int this_cpu = bcp->cpu;
unsigned long mmr_offset;
unsigned long index;
cycles_t time1;
cycles_t time2;
cycles_t elapsed;
struct ptc_stats *stat = bcp->statp;
struct bau_control *smaster = bcp->socket_master;
struct bau_control *hmaster = bcp->uvhub_master;
if (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
&hmaster->active_descriptor_count,
hmaster->max_bau_concurrent)) {
stat->s_throttles++;
do {
cpu_relax();
} while (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
&hmaster->active_descriptor_count,
hmaster->max_bau_concurrent));
}
while (hmaster->uvhub_quiesce)
cpu_relax();
if (cpu < UV_CPUS_PER_ACT_STATUS) {
mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
right_shift = cpu * UV_ACT_STATUS_SIZE;
} else {
mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_1;
right_shift =
((cpu - UV_CPUS_PER_ACT_STATUS) * UV_ACT_STATUS_SIZE);
}
time1 = get_cycles();
do {
if (try == 0) {
bau_desc->header.msg_type = MSG_REGULAR;
seq_number = bcp->message_number++;
} else {
bau_desc->header.msg_type = MSG_RETRY;
stat->s_retry_messages++;
}
bau_desc->header.sequence = seq_number;
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) {
destination_plugged(bau_desc, bcp, hmaster, stat);
} else if (completion_status == FLUSH_RETRY_TIMEOUT) {
destination_timeout(bau_desc, bcp, hmaster, stat);
}
if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
bcp->ipi_attempts = 0;
completion_status = FLUSH_GIVEUP;
break;
}
cpu_relax();
} while ((completion_status == FLUSH_RETRY_PLUGGED) ||
(completion_status == FLUSH_RETRY_TIMEOUT));
time2 = get_cycles();
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);
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) {
stat->s_giveup++;
return 1;
}
return 0;
}
/**
* uv_flush_tlb_others - globally purge translation cache of a virtual
* address or all TLB's
* @cpumask: mask of all cpu's in which the address is to be removed
* @mm: mm_struct containing virtual address range
* @va: virtual address to be removed (or TLB_FLUSH_ALL for all TLB's on cpu)
* @cpu: the current cpu
*
* This is the entry point for initiating any UV global TLB shootdown.
*
* Purges the translation caches of all specified processors of the given
* virtual address, or purges all TLB's on specified processors.
*
* The caller has derived the cpumask from the mm_struct. This function
* is called only if there are bits set in the mask. (e.g. flush_tlb_page())
*
* The cpumask is converted into a uvhubmask of the uvhubs containing
* those cpus.
*
* Note that this function should be called with preemption disabled.
*
* Returns NULL if all remote flushing was done.
* Returns pointer to cpumask if some remote flushing remains to be
* done. The returned pointer is valid till preemption is re-enabled.
*/
const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm,
unsigned long va, unsigned int cpu)
{
int locals = 0;
int remotes = 0;
int hubs = 0;
int tcpu;
int tpnode;
struct bau_desc *bau_desc;
struct cpumask *flush_mask;
struct ptc_stats *stat;
struct bau_control *bcp;
struct bau_control *tbcp;
struct hub_and_pnode *hpp;
/* 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. All cpus are converted to uvhubs and copied to the
* activation descriptor.
*/
flush_mask = (struct cpumask *)per_cpu(uv_flush_tlb_mask, cpu);
/* don't actually do a shootdown of the local cpu */
cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu));
if (cpu_isset(cpu, *cpumask))
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);
for_each_cpu(tcpu, flush_mask) {
/*
* The distribution vector is a bit map of pnodes, relative
* to the partition base pnode (and the partition base nasid
* in the header).
* Translate cpu to pnode and hub using an array stored
* in local memory.
*/
hpp = &bcp->socket_master->target_hub_and_pnode[tcpu];
tpnode = hpp->pnode - bcp->partition_base_pnode;
bau_uvhub_set(tpnode, &bau_desc->distribution);
if (hpp->uvhub == bcp->uvhub)
locals++;
else
remotes++;
}
if ((locals + remotes) == 0)
return NULL;
stat->s_requestor++;
stat->s_ntargcpu += remotes + locals;
stat->s_ntargremotes += remotes;
stat->s_ntarglocals += locals;
remotes = bau_uvhub_weight(&bau_desc->distribution);
/* 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 (hubs >= 8)
stat->s_ntarguvhub8++;
else if (hubs >= 4)
stat->s_ntarguvhub4++;
else if (hubs >= 2)
stat->s_ntarguvhub2++;
else
stat->s_ntarguvhub1++;
bau_desc->payload.address = va;
bau_desc->payload.sending_cpu = cpu;
/*
* 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.
*/
if (!uv_flush_send_and_wait(bau_desc, flush_mask, bcp))
return NULL;
else
return cpumask;
}
/*
* The BAU message interrupt comes here. (registered by set_intr_gate)
* See entry_64.S
*
* We received a broadcast assist message.
*
* Interrupts are disabled; this interrupt could represent
* the receipt of several messages.
*
* All cores/threads on this hub get this interrupt.
* The last one to see it does the software ack.
* (the resource will not be freed until noninterruptable cpus see this
* interrupt; hardware may timeout the s/w ack and reply ERROR)
*/
void uv_bau_message_interrupt(struct pt_regs *regs)
{
int count = 0;
cycles_t time_start;
struct bau_payload_queue_entry *msg;
struct bau_control *bcp;
struct ptc_stats *stat;
struct msg_desc msgdesc;
time_start = get_cycles();
bcp = &per_cpu(bau_control, 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;
while (msg->sw_ack_vector) {
count++;
msgdesc.msg_slot = msg - msgdesc.va_queue_first;
msgdesc.sw_ack_slot = ffs(msg->sw_ack_vector) - 1;
msgdesc.msg = msg;
uv_bau_process_message(&msgdesc, bcp);
msg++;
if (msg > msgdesc.va_queue_last)
msg = msgdesc.va_queue_first;
bcp->bau_msg_head = msg;
}
stat->d_time += (get_cycles() - time_start);
if (!count)
stat->d_nomsg++;
else if (count > 1)
stat->d_multmsg++;
ack_APIC_irq();
}
/*
* uv_enable_timeouts
*
* Each target uvhub (i.e. a uvhub that has no 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 __init uv_enable_timeouts(void)
{
int uvhub;
int nuvhubs;
int pnode;
unsigned long mmr_image;
nuvhubs = uv_num_possible_blades();
for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
if (!uv_blade_nr_possible_cpus(uvhub))
continue;
pnode = uv_blade_to_pnode(uvhub);
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 <<
UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
/*
* Set the 4-bit period.
*/
mmr_image &= ~((unsigned long)0xf <<
UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
mmr_image |= (UV_INTD_SOFT_ACK_TIMEOUT_PERIOD <<
UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
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 <<
UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
}
}
static void *uv_ptc_seq_start(struct seq_file *file, loff_t *offset)
{
if (*offset < num_possible_cpus())
return offset;
return NULL;
}
static void *uv_ptc_seq_next(struct seq_file *file, void *data, loff_t *offset)
{
(*offset)++;
if (*offset < num_possible_cpus())
return offset;
return NULL;
}
static void uv_ptc_seq_stop(struct seq_file *file, void *data)
{
}
static inline unsigned long long
microsec_2_cycles(unsigned long microsec)
{
unsigned long ns;
unsigned long long cyc;
ns = microsec * 1000;
cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
return cyc;
}
/*
* Display the statistics thru /proc.
* 'data' points to the cpu number
*/
static int uv_ptc_seq_show(struct seq_file *file, void *data)
{
struct ptc_stats *stat;
int cpu;
cpu = *(loff_t *)data;
if (!cpu) {
seq_printf(file,
"# cpu sent stime self locals remotes ncpus localhub ");
seq_printf(file,
"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 ");
seq_printf(file,
"disable enable\n");
}
if (cpu < num_possible_cpus() && cpu_online(cpu)) {
stat = &per_cpu(ptcstats, cpu);
/* source side statistics */
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_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_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 ",
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_alltlb, stat->d_onetlb, stat->d_multmsg,
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;
int ret;
buf = kasprintf(GFP_KERNEL, "%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);
if (!buf)
return -ENOMEM;
ret = simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
kfree(buf);
return ret;
}
/*
* -1: resetf the statistics
* 0: display meaning of the statistics
*/
static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
size_t count, loff_t *data)
{
int cpu;
long input_arg;
char optstr[64];
struct ptc_stats *stat;
if (count == 0 || count > sizeof(optstr))
return -EINVAL;
if (copy_from_user(optstr, user, count))
return -EFAULT;
optstr[count - 1] = '\0';
if (strict_strtol(optstr, 10, &input_arg) < 0) {
printk(KERN_DEBUG "%s is invalid\n", optstr);
return -EINVAL;
}
if (input_arg == 0) {
printk(KERN_DEBUG "# cpu: cpu number\n");
printk(KERN_DEBUG "Sender statistics:\n");
printk(KERN_DEBUG
"sent: number of shootdown messages sent\n");
printk(KERN_DEBUG
"stime: time spent sending messages\n");
printk(KERN_DEBUG
"numuvhubs: number of hubs targeted with shootdown\n");
printk(KERN_DEBUG
"numuvhubs16: number times 16 or more hubs targeted\n");
printk(KERN_DEBUG
"numuvhubs8: number times 8 or more hubs targeted\n");
printk(KERN_DEBUG
"numuvhubs4: number times 4 or more hubs targeted\n");
printk(KERN_DEBUG
"numuvhubs2: number times 2 or more hubs targeted\n");
printk(KERN_DEBUG
"numuvhubs1: number times 1 hub targeted\n");
printk(KERN_DEBUG
"numcpus: number of cpus targeted with shootdown\n");
printk(KERN_DEBUG
"dto: number of destination timeouts\n");
printk(KERN_DEBUG
"retries: destination timeout retries sent\n");
printk(KERN_DEBUG
"rok: : destination timeouts successfully retried\n");
printk(KERN_DEBUG
"resetp: ipi-style resource resets for plugs\n");
printk(KERN_DEBUG
"resett: ipi-style resource resets for timeouts\n");
printk(KERN_DEBUG
"giveup: fall-backs to ipi-style shootdowns\n");
printk(KERN_DEBUG
"sto: number of source timeouts\n");
printk(KERN_DEBUG
"bz: number of stay-busy's\n");
printk(KERN_DEBUG
"throt: number times spun in throttle\n");
printk(KERN_DEBUG "Destination side statistics:\n");
printk(KERN_DEBUG
"sw_ack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n");
printk(KERN_DEBUG
"recv: shootdown messages received\n");
printk(KERN_DEBUG
"rtime: time spent processing messages\n");
printk(KERN_DEBUG
"all: shootdown all-tlb messages\n");
printk(KERN_DEBUG
"one: shootdown one-tlb messages\n");
printk(KERN_DEBUG
"mult: interrupts that found multiple messages\n");
printk(KERN_DEBUG
"none: interrupts that found no messages\n");
printk(KERN_DEBUG
"retry: number of retry messages processed\n");
printk(KERN_DEBUG
"canc: number messages canceled by retries\n");
printk(KERN_DEBUG
"nocan: number retries that found nothing to cancel\n");
printk(KERN_DEBUG
"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));
}
}
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;
}
static const struct seq_operations uv_ptc_seq_ops = {
.start = uv_ptc_seq_start,
.next = uv_ptc_seq_next,
.stop = uv_ptc_seq_stop,
.show = uv_ptc_seq_show
};
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,
.write = uv_ptc_proc_write,
.llseek = seq_lseek,
.release = seq_release,
};
static const struct file_operations tunables_fops = {
.open = tunables_open,
.read = tunables_read,
.write = tunables_write,
.llseek = default_llseek,
};
static int __init uv_ptc_init(void)
{
struct proc_dir_entry *proc_uv_ptc;
if (!is_uv_system())
return 0;
proc_uv_ptc = proc_create(UV_PTC_BASENAME, 0444, NULL,
&proc_uv_ptc_operations);
if (!proc_uv_ptc) {
printk(KERN_ERR "unable to create %s proc entry\n",
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;
}
/*
* Initialize the sending side's sending buffers.
*/
static void
uv_activation_descriptor_init(int node, int pnode, int base_pnode)
{
int i;
int cpu;
unsigned long pa;
unsigned long m;
unsigned long n;
struct bau_desc *bau_desc;
struct bau_desc *bd2;
struct bau_control *bcp;
/*
* each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR)
* per cpu; and one per cpu on the uvhub (UV_ADP_SIZE)
*/
bau_desc = kmalloc_node(sizeof(struct bau_desc) * UV_ADP_SIZE
* UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node);
BUG_ON(!bau_desc);
pa = uv_gpa(bau_desc); /* need the real nasid*/
n = pa >> uv_nshift;
m = pa & uv_mmask;
/* the 14-bit pnode */
uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE,
(n << UV_DESC_BASE_PNODE_SHIFT | m));
/*
* Initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each
* cpu even though we only use the first one; one descriptor can
* describe a broadcast to 256 uv hubs.
*/
for (i = 0, bd2 = bau_desc; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR);
i++, bd2++) {
memset(bd2, 0, sizeof(struct bau_desc));
bd2->header.sw_ack_flag = 1;
/*
* The base_dest_nasid set in the message header is the nasid
* of the first uvhub in the partition. The bit map will
* indicate destination pnode numbers relative to that base.
* They may not be consecutive if nasid striding is being used.
*/
bd2->header.base_dest_nasid = UV_PNODE_TO_NASID(base_pnode);
bd2->header.dest_subnodeid = UV_LB_SUBNODEID;
bd2->header.command = UV_NET_ENDPOINT_INTD;
bd2->header.int_both = 1;
/*
* all others need to be set to zero:
* fairness chaining multilevel count replied_to
*/
}
for_each_present_cpu(cpu) {
if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu)))
continue;
bcp = &per_cpu(bau_control, cpu);
bcp->descriptor_base = bau_desc;
}
}
/*
* initialize the destination side's receiving buffers
* entered for each uvhub in the partition
* - node is first node (kernel memory notion) on the uvhub
* - pnode is the uvhub's physical identifier
*/
static void
uv_payload_queue_init(int node, int pnode)
{
int pn;
int cpu;
char *cp;
unsigned long pa;
struct bau_payload_queue_entry *pqp;
struct bau_payload_queue_entry *pqp_malloc;
struct bau_control *bcp;
pqp = kmalloc_node((DEST_Q_SIZE + 1)
* sizeof(struct bau_payload_queue_entry),
GFP_KERNEL, node);
BUG_ON(!pqp);
pqp_malloc = pqp;
cp = (char *)pqp + 31;
pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5);
for_each_present_cpu(cpu) {
if (pnode != uv_cpu_to_pnode(cpu))
continue;
/* for every cpu on this pnode: */
bcp = &per_cpu(bau_control, cpu);
bcp->va_queue_first = pqp;
bcp->bau_msg_head = pqp;
bcp->va_queue_last = pqp + (DEST_Q_SIZE - 1);
}
/*
* need the pnode of where the memory was really allocated
*/
pa = uv_gpa(pqp);
pn = pa >> uv_nshift;
uv_write_global_mmr64(pnode,
UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST,
((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) |
uv_physnodeaddr(pqp));
uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL,
uv_physnodeaddr(pqp));
uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST,
(unsigned long)
uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1)));
/* in effect, all msg_type's are set to MSG_NOOP */
memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE);
}
/*
* Initialization of each UV hub's structures
*/
static void __init uv_init_uvhub(int uvhub, int vector, int base_pnode)
{
int node;
int pnode;
unsigned long apicid;
node = uvhub_to_first_node(uvhub);
pnode = uv_blade_to_pnode(uvhub);
uv_activation_descriptor_init(node, pnode, base_pnode);
uv_payload_queue_init(node, pnode);
/*
* The below initialization can't be in firmware because the
* messaging IRQ will be determined by the OS.
*/
apicid = uvhub_to_first_apicid(uvhub) | uv_apicid_hibits;
uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
((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
*/
static int __init uv_init_per_cpu(int nuvhubs, int base_part_pnode)
{
int i;
int cpu;
int tcpu;
int pnode;
int uvhub;
int have_hmaster;
short socket = 0;
unsigned short socket_mask;
unsigned char *uvhub_mask;
struct bau_control *bcp;
struct uvhub_desc *bdp;
struct socket_desc *sdp;
struct bau_control *hmaster = NULL;
struct bau_control *smaster = NULL;
struct socket_desc {
short num_cpus;
short cpu_number[MAX_CPUS_PER_SOCKET];
};
struct uvhub_desc {
unsigned short socket_mask;
short num_cpus;
short uvhub;
short pnode;
struct socket_desc socket[2];
};
struct uvhub_desc *uvhub_descs;
timeout_us = calculate_destination_timeout();
uvhub_descs = kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
memset(bcp, 0, sizeof(struct bau_control));
pnode = uv_cpu_hub_info(cpu)->pnode;
if ((pnode - base_part_pnode) >= UV_DISTRIBUTION_SIZE) {
printk(KERN_EMERG
"cpu %d pnode %d-%d beyond %d; BAU disabled\n",
cpu, pnode, base_part_pnode,
UV_DISTRIBUTION_SIZE);
return 1;
}
bcp->osnode = cpu_to_node(cpu);
bcp->partition_base_pnode = uv_partition_base_pnode;
uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
*(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8));
bdp = &uvhub_descs[uvhub];
bdp->num_cpus++;
bdp->uvhub = uvhub;
bdp->pnode = pnode;
/* kludge: 'assuming' one node per socket, and assuming that
disabling a socket just leaves a gap in node numbers */
socket = bcp->osnode & 1;
bdp->socket_mask |= (1 << socket);
sdp = &bdp->socket[socket];
sdp->cpu_number[sdp->num_cpus] = cpu;
sdp->num_cpus++;
if (sdp->num_cpus > MAX_CPUS_PER_SOCKET) {
printk(KERN_EMERG "%d cpus per socket invalid\n", sdp->num_cpus);
return 1;
}
}
for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
continue;
have_hmaster = 0;
bdp = &uvhub_descs[uvhub];
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 (i == 0) {
smaster = bcp;
if (!have_hmaster) {
have_hmaster++;
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;
bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->
blade_processor_id;
if (bcp->uvhub_cpu >= MAX_CPUS_PER_UVHUB) {
printk(KERN_EMERG
"%d cpus per uvhub invalid\n",
bcp->uvhub_cpu);
return 1;
}
}
nextsocket:
socket++;
socket_mask = (socket_mask >> 1);
/* each socket gets a local array of pnodes/hubs */
bcp = smaster;
bcp->target_hub_and_pnode = kmalloc_node(
sizeof(struct hub_and_pnode) *
num_possible_cpus(), GFP_KERNEL, bcp->osnode);
memset(bcp->target_hub_and_pnode, 0,
sizeof(struct hub_and_pnode) *
num_possible_cpus());
for_each_present_cpu(tcpu) {
bcp->target_hub_and_pnode[tcpu].pnode =
uv_cpu_hub_info(tcpu)->pnode;
bcp->target_hub_and_pnode[tcpu].uvhub =
uv_cpu_hub_info(tcpu)->numa_blade_id;
}
}
}
kfree(uvhub_descs);
kfree(uvhub_mask);
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;
}
return 0;
}
/*
* Initialization of BAU-related structures
*/
static int __init uv_bau_init(void)
{
int uvhub;
int pnode;
int nuvhubs;
int cur_cpu;
int vector;
unsigned long mmr;
if (!is_uv_system())
return 0;
if (nobau)
return 0;
for_each_possible_cpu(cur_cpu)
zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu),
GFP_KERNEL, cpu_to_node(cur_cpu));
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_partition_base_pnode = 0x7fffffff;
for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
if (uv_blade_nr_possible_cpus(uvhub) &&
(uv_blade_to_pnode(uvhub) < uv_partition_base_pnode))
uv_partition_base_pnode = uv_blade_to_pnode(uvhub);
}
if (uv_init_per_cpu(nuvhubs, uv_partition_base_pnode)) {
nobau = 1;
return 0;
}
vector = UV_BAU_MESSAGE;
for_each_possible_blade(uvhub)
if (uv_blade_nr_possible_cpus(uvhub))
uv_init_uvhub(uvhub, vector, uv_partition_base_pnode);
uv_enable_timeouts();
alloc_intr_gate(vector, uv_bau_message_intr1);
for_each_possible_blade(uvhub) {
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);
fs_initcall(uv_ptc_init);