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android-kvm / linux / c0be92b5b14bc6928363527602dabff57875473a / . / arch / x86 / platform / uv / tlb_uv.c
blob: a4130b84d1ff5650f020802f7ebe7e990db97e71 [file] [log] [blame]
/*
* SGI UltraViolet TLB flush routines.
*
* (c) 2008-2014 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/tsc.h>
#include <asm/irq_vectors.h>
#include <asm/timer.h>
static struct bau_operations ops __ro_after_init;
/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
static const int timeout_base_ns[] = {
20,
160,
1280,
10240,
81920,
655360,
5242880,
167772160
};
static int timeout_us;
static bool nobau = true;
static int nobau_perm;
/* tunables: */
static int max_concurr = MAX_BAU_CONCURRENT;
static int max_concurr_const = MAX_BAU_CONCURRENT;
static int plugged_delay = PLUGGED_DELAY;
static int plugsb4reset = PLUGSB4RESET;
static int giveup_limit = GIVEUP_LIMIT;
static int timeoutsb4reset = TIMEOUTSB4RESET;
static int ipi_reset_limit = IPI_RESET_LIMIT;
static int complete_threshold = COMPLETE_THRESHOLD;
static int congested_respns_us = CONGESTED_RESPONSE_US;
static int congested_reps = CONGESTED_REPS;
static int disabled_period = DISABLED_PERIOD;
static struct tunables tunables[] = {
{&max_concurr, MAX_BAU_CONCURRENT}, /* must be [0] */
{&plugged_delay, PLUGGED_DELAY},
{&plugsb4reset, PLUGSB4RESET},
{&timeoutsb4reset, TIMEOUTSB4RESET},
{&ipi_reset_limit, IPI_RESET_LIMIT},
{&complete_threshold, COMPLETE_THRESHOLD},
{&congested_respns_us, CONGESTED_RESPONSE_US},
{&congested_reps, CONGESTED_REPS},
{&disabled_period, DISABLED_PERIOD},
{&giveup_limit, GIVEUP_LIMIT}
};
static struct dentry *tunables_dir;
static struct dentry *tunables_file;
/* these correspond to the statistics printed by ptc_seq_show() */
static char *stat_description[] = {
"sent: number of shootdown messages sent",
"stime: time spent sending messages",
"numuvhubs: number of hubs targeted with shootdown",
"numuvhubs16: number times 16 or more hubs targeted",
"numuvhubs8: number times 8 or more hubs targeted",
"numuvhubs4: number times 4 or more hubs targeted",
"numuvhubs2: number times 2 or more hubs targeted",
"numuvhubs1: number times 1 hub targeted",
"numcpus: number of cpus targeted with shootdown",
"dto: number of destination timeouts",
"retries: destination timeout retries sent",
"rok: : destination timeouts successfully retried",
"resetp: ipi-style resource resets for plugs",
"resett: ipi-style resource resets for timeouts",
"giveup: fall-backs to ipi-style shootdowns",
"sto: number of source timeouts",
"bz: number of stay-busy's",
"throt: number times spun in throttle",
"swack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE",
"recv: shootdown messages received",
"rtime: time spent processing messages",
"all: shootdown all-tlb messages",
"one: shootdown one-tlb messages",
"mult: interrupts that found multiple messages",
"none: interrupts that found no messages",
"retry: number of retry messages processed",
"canc: number messages canceled by retries",
"nocan: number retries that found nothing to cancel",
"reset: number of ipi-style reset requests processed",
"rcan: number messages canceled by reset requests",
"disable: number times use of the BAU was disabled",
"enable: number times use of the BAU was re-enabled"
};
static int __init setup_bau(char *arg)
{
int result;
if (!arg)
return -EINVAL;
result = strtobool(arg, &nobau);
if (result)
return result;
/* we need to flip the logic here, so that bau=y sets nobau to false */
nobau = !nobau;
if (!nobau)
pr_info("UV BAU Enabled\n");
else
pr_info("UV BAU Disabled\n");
return 0;
}
early_param("bau", setup_bau);
/* base pnode in this partition */
static int uv_base_pnode __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);
static void
set_bau_on(void)
{
int cpu;
struct bau_control *bcp;
if (nobau_perm) {
pr_info("BAU not initialized; cannot be turned on\n");
return;
}
nobau = false;
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
bcp->nobau = false;
}
pr_info("BAU turned on\n");
return;
}
static void
set_bau_off(void)
{
int cpu;
struct bau_control *bcp;
nobau = true;
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
bcp->nobau = true;
}
pr_info("BAU turned off\n");
return;
}
/*
* 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 void reply_to_message(struct msg_desc *mdp, struct bau_control *bcp,
int do_acknowledge)
{
unsigned long dw;
struct bau_pq_entry *msg;
msg = mdp->msg;
if (!msg->canceled && do_acknowledge) {
dw = (msg->swack_vec << UV_SW_ACK_NPENDING) | msg->swack_vec;
ops.write_l_sw_ack(dw);
}
msg->replied_to = 1;
msg->swack_vec = 0;
}
/*
* Process the receipt of a RETRY message
*/
static void bau_process_retry_msg(struct msg_desc *mdp,
struct bau_control *bcp)
{
int i;
int cancel_count = 0;
unsigned long msg_res;
unsigned long mmr = 0;
struct bau_pq_entry *msg = mdp->msg;
struct bau_pq_entry *msg2;
struct ptc_stats *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->queue_last)
msg2 = mdp->queue_first;
if (msg2 == msg)
break;
/* same conditions for cancellation as do_reset */
if ((msg2->replied_to == 0) && (msg2->canceled == 0) &&
(msg2->swack_vec) && ((msg2->swack_vec &
msg->swack_vec) == 0) &&
(msg2->sending_cpu == msg->sending_cpu) &&
(msg2->msg_type != MSG_NOOP)) {
mmr = ops.read_l_sw_ack();
msg_res = msg2->swack_vec;
/*
* 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)) {
unsigned long mr;
/*
* Is the resource timed out?
* Make everyone ignore the cancelled message.
*/
msg2->canceled = 1;
stat->d_canceled++;
cancel_count++;
mr = (msg_res << UV_SW_ACK_NPENDING) | msg_res;
ops.write_l_sw_ack(mr);
}
}
}
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 bau_process_message(struct msg_desc *mdp, struct bau_control *bcp,
int do_acknowledge)
{
short socket_ack_count = 0;
short *sp;
struct atomic_short *asp;
struct ptc_stats *stat = bcp->statp;
struct bau_pq_entry *msg = mdp->msg;
struct bau_control *smaster = bcp->socket_master;
/*
* This must be a normal message, or retry of a normal message
*/
if (msg->address == TLB_FLUSH_ALL) {
local_flush_tlb();
stat->d_alltlb++;
} else {
__flush_tlb_one_user(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)
bau_process_retry_msg(mdp, bcp);
/*
* This is a swack 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.
*/
sp = &smaster->socket_acknowledge_count[mdp->msg_slot];
asp = (struct atomic_short *)sp;
socket_ack_count = atom_asr(1, asp);
if (socket_ack_count == bcp->cpus_in_socket) {
int msg_ack_count;
/*
* Both sockets dump their completed count total into
* the message's count.
*/
*sp = 0;
asp = (struct atomic_short *)&msg->acknowledge_count;
msg_ack_count = atom_asr(socket_ack_count, asp);
if (msg_ack_count == bcp->cpus_in_uvhub) {
/*
* All cpus in uvhub saw it; reply
* (unless we are in the UV2 workaround)
*/
reply_to_message(mdp, bcp, do_acknowledge);
}
}
return;
}
/*
* Determine the first cpu on a pnode.
*/
static int pnode_to_first_cpu(int pnode, struct bau_control *smaster)
{
int cpu;
struct hub_and_pnode *hpp;
for_each_present_cpu(cpu) {
hpp = &smaster->thp[cpu];
if (pnode == hpp->pnode)
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 swack_vec field.
*
* This is entered for a single cpu on the uvhub.
* The sender want's this uvhub to free a specific message's
* swack resources.
*/
static void do_reset(void *ptr)
{
int i;
struct bau_control *bcp = &per_cpu(bau_control, smp_processor_id());
struct reset_args *rap = (struct reset_args *)ptr;
struct bau_pq_entry *msg;
struct ptc_stats *stat = bcp->statp;
stat->d_resets++;
/*
* We're looking for the given sender, and
* will free its swack resource.
* If all cpu's finally responded after the timeout, its
* message 'replied_to' was set.
*/
for (msg = bcp->queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) {
unsigned long msg_res;
/* do_reset: same conditions for cancellation as
bau_process_retry_msg() */
if ((msg->replied_to == 0) &&
(msg->canceled == 0) &&
(msg->sending_cpu == rap->sender) &&
(msg->swack_vec) &&
(msg->msg_type != MSG_NOOP)) {
unsigned long mmr;
unsigned long mr;
/*
* make everyone else ignore this message
*/
msg->canceled = 1;
/*
* only reset the resource if it is still pending
*/
mmr = ops.read_l_sw_ack();
msg_res = msg->swack_vec;
mr = (msg_res << UV_SW_ACK_NPENDING) | msg_res;
if (mmr & msg_res) {
stat->d_rcanceled++;
ops.write_l_sw_ack(mr);
}
}
}
return;
}
/*
* Use IPI to get all target uvhubs to release resources held by
* a given sending cpu number.
*/
static void reset_with_ipi(struct pnmask *distribution, struct bau_control *bcp)
{
int pnode;
int apnode;
int maskbits;
int sender = bcp->cpu;
cpumask_t *mask = bcp->uvhub_master->cpumask;
struct bau_control *smaster = bcp->socket_master;
struct reset_args reset_args;
reset_args.sender = sender;
cpumask_clear(mask);
/* find a single cpu for each uvhub in this distribution mask */
maskbits = sizeof(struct pnmask) * BITSPERBYTE;
/* each bit is a pnode relative to the partition base pnode */
for (pnode = 0; pnode < maskbits; pnode++) {
int cpu;
if (!bau_uvhub_isset(pnode, distribution))
continue;
apnode = pnode + bcp->partition_base_pnode;
cpu = pnode_to_first_cpu(apnode, smaster);
cpumask_set_cpu(cpu, mask);
}
/* IPI all cpus; preemption is already disabled */
smp_call_function_many(mask, do_reset, (void *)&reset_args, 1);
return;
}
/*
* Not to be confused with cycles_2_ns() from tsc.c; this gives a relative
* number, not an absolute. It converts a duration in cycles to a duration in
* ns.
*/
static inline unsigned long long cycles_2_ns(unsigned long long cyc)
{
struct cyc2ns_data data;
unsigned long long ns;
cyc2ns_read_begin(&data);
ns = mul_u64_u32_shr(cyc, data.cyc2ns_mul, data.cyc2ns_shift);
cyc2ns_read_end();
return ns;
}
/*
* The reverse of the above; converts a duration in ns to a duration in cycles.
*/
static inline unsigned long long ns_2_cycles(unsigned long long ns)
{
struct cyc2ns_data data;
unsigned long long cyc;
cyc2ns_read_begin(&data);
cyc = (ns << data.cyc2ns_shift) / data.cyc2ns_mul;
cyc2ns_read_end();
return cyc;
}
static inline unsigned long cycles_2_us(unsigned long long cyc)
{
return cycles_2_ns(cyc) / NSEC_PER_USEC;
}
static inline cycles_t sec_2_cycles(unsigned long sec)
{
return ns_2_cycles(sec * NSEC_PER_SEC);
}
static inline unsigned long long usec_2_cycles(unsigned long usec)
{
return ns_2_cycles(usec * NSEC_PER_USEC);
}
/*
* 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)
{
atom_asr(1, (struct atomic_short *)&hmaster->uvhub_quiesce);
}
/*
* mark this quiet-requestor as done
*/
static inline void end_uvhub_quiesce(struct bau_control *hmaster)
{
atom_asr(-1, (struct atomic_short *)&hmaster->uvhub_quiesce);
}
static unsigned long uv1_read_status(unsigned long mmr_offset, int right_shift)
{
unsigned long descriptor_status;
descriptor_status = uv_read_local_mmr(mmr_offset);
descriptor_status >>= right_shift;
descriptor_status &= UV_ACT_STATUS_MASK;
return descriptor_status;
}
/*
* Wait for completion of a broadcast software ack message
* return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
*/
static int uv1_wait_completion(struct bau_desc *bau_desc,
struct bau_control *bcp, long try)
{
unsigned long descriptor_status;
cycles_t ttm;
u64 mmr_offset = bcp->status_mmr;
int right_shift = bcp->status_index;
struct ptc_stats *stat = bcp->statp;
descriptor_status = uv1_read_status(mmr_offset, right_shift);
/* spin on the status MMR, waiting for it to go idle */
while ((descriptor_status != DS_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 == DS_SOURCE_TIMEOUT) {
stat->s_stimeout++;
return FLUSH_GIVEUP;
} else if (descriptor_status == DS_DESTINATION_TIMEOUT) {
stat->s_dtimeout++;
ttm = 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(ttm - 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();
}
descriptor_status = uv1_read_status(mmr_offset, right_shift);
}
bcp->conseccompletes++;
return FLUSH_COMPLETE;
}
/*
* UV2 could have an extra bit of status in the ACTIVATION_STATUS_2 register.
* But not currently used.
*/
static unsigned long uv2_3_read_status(unsigned long offset, int rshft, int desc)
{
return ((read_lmmr(offset) >> rshft) & UV_ACT_STATUS_MASK) << 1;
}
/*
* Entered when a bau descriptor has gone into a permanent busy wait because
* of a hardware bug.
* Workaround the bug.
*/
static int handle_uv2_busy(struct bau_control *bcp)
{
struct ptc_stats *stat = bcp->statp;
stat->s_uv2_wars++;
bcp->busy = 1;
return FLUSH_GIVEUP;
}
static int uv2_3_wait_completion(struct bau_desc *bau_desc,
struct bau_control *bcp, long try)
{
unsigned long descriptor_stat;
cycles_t ttm;
u64 mmr_offset = bcp->status_mmr;
int right_shift = bcp->status_index;
int desc = bcp->uvhub_cpu;
long busy_reps = 0;
struct ptc_stats *stat = bcp->statp;
descriptor_stat = uv2_3_read_status(mmr_offset, right_shift, desc);
/* spin on the status MMR, waiting for it to go idle */
while (descriptor_stat != UV2H_DESC_IDLE) {
if (descriptor_stat == UV2H_DESC_SOURCE_TIMEOUT) {
/*
* A h/w bug on the destination side may
* have prevented the message being marked
* pending, thus it doesn't get replied to
* and gets continually nacked until it times
* out with a SOURCE_TIMEOUT.
*/
stat->s_stimeout++;
return FLUSH_GIVEUP;
} else if (descriptor_stat == UV2H_DESC_DEST_TIMEOUT) {
ttm = 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.
* Without using the extended status we have to
* deduce from the short time that this was a
* strong nack.
*/
if (cycles_2_us(ttm - bcp->send_message) < timeout_us) {
bcp->conseccompletes = 0;
stat->s_plugged++;
/* FLUSH_RETRY_PLUGGED causes hang on boot */
return FLUSH_GIVEUP;
}
stat->s_dtimeout++;
bcp->conseccompletes = 0;
/* FLUSH_RETRY_TIMEOUT causes hang on boot */
return FLUSH_GIVEUP;
} else {
busy_reps++;
if (busy_reps > 1000000) {
/* not to hammer on the clock */
busy_reps = 0;
ttm = get_cycles();
if ((ttm - bcp->send_message) > bcp->timeout_interval)
return handle_uv2_busy(bcp);
}
/*
* descriptor_stat is still BUSY
*/
cpu_relax();
}
descriptor_stat = uv2_3_read_status(mmr_offset, right_shift, desc);
}
bcp->conseccompletes++;
return FLUSH_COMPLETE;
}
/*
* Returns the status of current BAU message for cpu desc as a bit field
* [Error][Busy][Aux]
*/
static u64 read_status(u64 status_mmr, int index, int desc)
{
u64 stat;
stat = ((read_lmmr(status_mmr) >> index) & UV_ACT_STATUS_MASK) << 1;
stat |= (read_lmmr(UVH_LB_BAU_SB_ACTIVATION_STATUS_2) >> desc) & 0x1;
return stat;
}
static int uv4_wait_completion(struct bau_desc *bau_desc,
struct bau_control *bcp, long try)
{
struct ptc_stats *stat = bcp->statp;
u64 descriptor_stat;
u64 mmr = bcp->status_mmr;
int index = bcp->status_index;
int desc = bcp->uvhub_cpu;
descriptor_stat = read_status(mmr, index, desc);
/* spin on the status MMR, waiting for it to go idle */
while (descriptor_stat != UV2H_DESC_IDLE) {
switch (descriptor_stat) {
case UV2H_DESC_SOURCE_TIMEOUT:
stat->s_stimeout++;
return FLUSH_GIVEUP;
case UV2H_DESC_DEST_TIMEOUT:
stat->s_dtimeout++;
bcp->conseccompletes = 0;
return FLUSH_RETRY_TIMEOUT;
case UV2H_DESC_DEST_STRONG_NACK:
stat->s_plugged++;
bcp->conseccompletes = 0;
return FLUSH_RETRY_PLUGGED;
case UV2H_DESC_DEST_PUT_ERR:
bcp->conseccompletes = 0;
return FLUSH_GIVEUP;
default:
/* descriptor_stat is still BUSY */
cpu_relax();
}
descriptor_stat = read_status(mmr, index, desc);
}
bcp->conseccompletes++;
return FLUSH_COMPLETE;
}
/*
* Our retries are blocked by all destination sw ack 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);
reset_with_ipi(&bau_desc->distribution, bcp);
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_concurr = 1;
bcp->timeout_tries++;
if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
bcp->timeout_tries = 0;
quiesce_local_uvhub(hmaster);
spin_lock(&hmaster->queue_lock);
reset_with_ipi(&bau_desc->distribution, bcp);
spin_unlock(&hmaster->queue_lock);
end_uvhub_quiesce(hmaster);
bcp->ipi_attempts++;
stat->s_resets_timeout++;
}
}
/*
* Stop all cpus on a uvhub from using the BAU for a period of time.
* This is reversed by check_enable.
*/
static void disable_for_period(struct bau_control *bcp, struct ptc_stats *stat)
{
int tcpu;
struct bau_control *tbcp;
struct bau_control *hmaster;
cycles_t tm1;
hmaster = bcp->uvhub_master;
spin_lock(&hmaster->disable_lock);
if (!bcp->baudisabled) {
stat->s_bau_disabled++;
tm1 = get_cycles();
for_each_present_cpu(tcpu) {
tbcp = &per_cpu(bau_control, tcpu);
if (tbcp->uvhub_master == hmaster) {
tbcp->baudisabled = 1;
tbcp->set_bau_on_time =
tm1 + bcp->disabled_period;
}
}
}
spin_unlock(&hmaster->disable_lock);
}
static void count_max_concurr(int stat, struct bau_control *bcp,
struct bau_control *hmaster)
{
bcp->plugged_tries = 0;
bcp->timeout_tries = 0;
if (stat != FLUSH_COMPLETE)
return;
if (bcp->conseccompletes <= bcp->complete_threshold)
return;
if (hmaster->max_concurr >= hmaster->max_concurr_const)
return;
hmaster->max_concurr++;
}
static void record_send_stats(cycles_t time1, cycles_t time2,
struct bau_control *bcp, struct ptc_stats *stat,
int completion_status, int try)
{
cycles_t elapsed;
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 > usec_2_cycles(bcp->cong_response_us)) &&
(bcp->period_requests > bcp->cong_reps) &&
((bcp->period_time / bcp->period_requests) >
usec_2_cycles(bcp->cong_response_us))) {
stat->s_congested++;
disable_for_period(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++;
if (get_cycles() > bcp->period_end)
bcp->period_giveups = 0;
bcp->period_giveups++;
if (bcp->period_giveups == 1)
bcp->period_end = get_cycles() + bcp->disabled_period;
if (bcp->period_giveups > bcp->giveup_limit) {
disable_for_period(bcp, stat);
stat->s_giveuplimit++;
}
}
}
/*
* Because of a uv1 hardware bug only a limited number of concurrent
* requests can be made.
*/
static void uv1_throttle(struct bau_control *hmaster, struct ptc_stats *stat)
{
spinlock_t *lock = &hmaster->uvhub_lock;
atomic_t *v;
v = &hmaster->active_descriptor_count;
if (!atomic_inc_unless_ge(lock, v, hmaster->max_concurr)) {
stat->s_throttles++;
do {
cpu_relax();
} while (!atomic_inc_unless_ge(lock, v, hmaster->max_concurr));
}
}
/*
* Handle the completion status of a message send.
*/
static void handle_cmplt(int completion_status, struct bau_desc *bau_desc,
struct bau_control *bcp, struct bau_control *hmaster,
struct ptc_stats *stat)
{
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);
}
/*
* 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.
*/
static int uv_flush_send_and_wait(struct cpumask *flush_mask,
struct bau_control *bcp,
struct bau_desc *bau_desc)
{
int seq_number = 0;
int completion_stat = 0;
int uv1 = 0;
long try = 0;
unsigned long index;
cycles_t time1;
cycles_t time2;
struct ptc_stats *stat = bcp->statp;
struct bau_control *hmaster = bcp->uvhub_master;
struct uv1_bau_msg_header *uv1_hdr = NULL;
struct uv2_3_bau_msg_header *uv2_3_hdr = NULL;
if (bcp->uvhub_version == UV_BAU_V1) {
uv1 = 1;
uv1_throttle(hmaster, stat);
}
while (hmaster->uvhub_quiesce)
cpu_relax();
time1 = get_cycles();
if (uv1)
uv1_hdr = &bau_desc->header.uv1_hdr;
else
/* uv2 and uv3 */
uv2_3_hdr = &bau_desc->header.uv2_3_hdr;
do {
if (try == 0) {
if (uv1)
uv1_hdr->msg_type = MSG_REGULAR;
else
uv2_3_hdr->msg_type = MSG_REGULAR;
seq_number = bcp->message_number++;
} else {
if (uv1)
uv1_hdr->msg_type = MSG_RETRY;
else
uv2_3_hdr->msg_type = MSG_RETRY;
stat->s_retry_messages++;
}
if (uv1)
uv1_hdr->sequence = seq_number;
else
uv2_3_hdr->sequence = seq_number;
index = (1UL << AS_PUSH_SHIFT) | bcp->uvhub_cpu;
bcp->send_message = get_cycles();
write_mmr_activation(index);
try++;
completion_stat = ops.wait_completion(bau_desc, bcp, try);
handle_cmplt(completion_stat, bau_desc, bcp, hmaster, stat);
if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
bcp->ipi_attempts = 0;
stat->s_overipilimit++;
completion_stat = FLUSH_GIVEUP;
break;
}
cpu_relax();
} while ((completion_stat == FLUSH_RETRY_PLUGGED) ||
(completion_stat == FLUSH_RETRY_TIMEOUT));
time2 = get_cycles();
count_max_concurr(completion_stat, bcp, hmaster);
while (hmaster->uvhub_quiesce)
cpu_relax();
atomic_dec(&hmaster->active_descriptor_count);
record_send_stats(time1, time2, bcp, stat, completion_stat, try);
if (completion_stat == FLUSH_GIVEUP)
/* FLUSH_GIVEUP will fall back to using IPI's for tlb flush */
return 1;
return 0;
}
/*
* The BAU is disabled for this uvhub. When the disabled time period has
* expired re-enable it.
* Return 0 if it is re-enabled for all cpus on this uvhub.
*/
static int check_enable(struct bau_control *bcp, struct ptc_stats *stat)
{
int tcpu;
struct bau_control *tbcp;
struct bau_control *hmaster;
hmaster = bcp->uvhub_master;
spin_lock(&hmaster->disable_lock);
if (bcp->baudisabled && (get_cycles() >= bcp->set_bau_on_time)) {
stat->s_bau_reenabled++;
for_each_present_cpu(tcpu) {
tbcp = &per_cpu(bau_control, tcpu);
if (tbcp->uvhub_master == hmaster) {
tbcp->baudisabled = 0;
tbcp->period_requests = 0;
tbcp->period_time = 0;
tbcp->period_giveups = 0;
}
}
spin_unlock(&hmaster->disable_lock);
return 0;
}
spin_unlock(&hmaster->disable_lock);
return -1;
}
static void record_send_statistics(struct ptc_stats *stat, int locals, int hubs,
int remotes, struct bau_desc *bau_desc)
{
stat->s_requestor++;
stat->s_ntargcpu += remotes + locals;
stat->s_ntargremotes += remotes;
stat->s_ntarglocals += locals;
/* 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++;
}
/*
* Translate a cpu mask to the uvhub distribution mask in the BAU
* activation descriptor.
*/
static int set_distrib_bits(struct cpumask *flush_mask, struct bau_control *bcp,
struct bau_desc *bau_desc, int *localsp, int *remotesp)
{
int cpu;
int pnode;
int cnt = 0;
struct hub_and_pnode *hpp;
for_each_cpu(cpu, 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 a local memory array.
*/
hpp = &bcp->socket_master->thp[cpu];
pnode = hpp->pnode - bcp->partition_base_pnode;
bau_uvhub_set(pnode, &bau_desc->distribution);
cnt++;
if (hpp->uvhub == bcp->uvhub)
(*localsp)++;
else
(*remotesp)++;
}
if (!cnt)
return 1;
return 0;
}
/*
* 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
* @start: start virtual address to be removed from TLB
* @end: end virtual address to be remove from TLB
* @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,
const struct flush_tlb_info *info)
{
unsigned int cpu = smp_processor_id();
int locals = 0, remotes = 0, hubs = 0;
struct bau_desc *bau_desc;
struct cpumask *flush_mask;
struct ptc_stats *stat;
struct bau_control *bcp;
unsigned long descriptor_status, status, address;
bcp = &per_cpu(bau_control, cpu);
if (bcp->nobau)
return cpumask;
stat = bcp->statp;
stat->s_enters++;
if (bcp->busy) {
descriptor_status =
read_lmmr(UVH_LB_BAU_SB_ACTIVATION_STATUS_0);
status = ((descriptor_status >> (bcp->uvhub_cpu *
UV_ACT_STATUS_SIZE)) & UV_ACT_STATUS_MASK) << 1;
if (status == UV2H_DESC_BUSY)
return cpumask;
bcp->busy = 0;
}
/* bau was disabled due to slow response */
if (bcp->baudisabled) {
if (check_enable(bcp, stat)) {
stat->s_ipifordisabled++;
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 (cpumask_test_cpu(cpu, cpumask))
stat->s_ntargself++;
bau_desc = bcp->descriptor_base;
bau_desc += (ITEMS_PER_DESC * bcp->uvhub_cpu);
bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
if (set_distrib_bits(flush_mask, bcp, bau_desc, &locals, &remotes))
return NULL;
record_send_statistics(stat, locals, hubs, remotes, bau_desc);
if (!info->end || (info->end - info->start) <= PAGE_SIZE)
address = info->start;
else
address = TLB_FLUSH_ALL;
switch (bcp->uvhub_version) {
case UV_BAU_V1:
case UV_BAU_V2:
case UV_BAU_V3:
bau_desc->payload.uv1_2_3.address = address;
bau_desc->payload.uv1_2_3.sending_cpu = cpu;
break;
case UV_BAU_V4:
bau_desc->payload.uv4.address = address;
bau_desc->payload.uv4.sending_cpu = cpu;
bau_desc->payload.uv4.qualifier = BAU_DESC_QUALIFIER;
break;
}
/*
* 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(flush_mask, bcp, bau_desc))
return NULL;
else
return cpumask;
}
/*
* Search the message queue for any 'other' unprocessed message with the
* same software acknowledge resource bit vector as the 'msg' message.
*/
static struct bau_pq_entry *find_another_by_swack(struct bau_pq_entry *msg,
struct bau_control *bcp)
{
struct bau_pq_entry *msg_next = msg + 1;
unsigned char swack_vec = msg->swack_vec;
if (msg_next > bcp->queue_last)
msg_next = bcp->queue_first;
while (msg_next != msg) {
if ((msg_next->canceled == 0) && (msg_next->replied_to == 0) &&
(msg_next->swack_vec == swack_vec))
return msg_next;
msg_next++;
if (msg_next > bcp->queue_last)
msg_next = bcp->queue_first;
}
return NULL;
}
/*
* UV2 needs to work around a bug in which an arriving message has not
* set a bit in the UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE register.
* Such a message must be ignored.
*/
static void process_uv2_message(struct msg_desc *mdp, struct bau_control *bcp)
{
unsigned long mmr_image;
unsigned char swack_vec;
struct bau_pq_entry *msg = mdp->msg;
struct bau_pq_entry *other_msg;
mmr_image = ops.read_l_sw_ack();
swack_vec = msg->swack_vec;
if ((swack_vec & mmr_image) == 0) {
/*
* This message was assigned a swack resource, but no
* reserved acknowlegment is pending.
* The bug has prevented this message from setting the MMR.
*/
/*
* Some message has set the MMR 'pending' bit; it might have
* been another message. Look for that message.
*/
other_msg = find_another_by_swack(msg, bcp);
if (other_msg) {
/*
* There is another. Process this one but do not
* ack it.
*/
bau_process_message(mdp, bcp, 0);
/*
* Let the natural processing of that other message
* acknowledge it. Don't get the processing of sw_ack's
* out of order.
*/
return;
}
}
/*
* Either the MMR shows this one pending a reply or there is no
* other message using this sw_ack, so it is safe to acknowledge it.
*/
bau_process_message(mdp, bcp, 1);
return;
}
/*
* 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_pq_entry *msg;
struct bau_control *bcp;
struct ptc_stats *stat;
struct msg_desc msgdesc;
ack_APIC_irq();
kvm_set_cpu_l1tf_flush_l1d();
time_start = get_cycles();
bcp = &per_cpu(bau_control, smp_processor_id());
stat = bcp->statp;
msgdesc.queue_first = bcp->queue_first;
msgdesc.queue_last = bcp->queue_last;
msg = bcp->bau_msg_head;
while (msg->swack_vec) {
count++;
msgdesc.msg_slot = msg - msgdesc.queue_first;
msgdesc.msg = msg;
if (bcp->uvhub_version == UV_BAU_V2)
process_uv2_message(&msgdesc, bcp);
else
/* no error workaround for uv1 or uv3 */
bau_process_message(&msgdesc, bcp, 1);
msg++;
if (msg > msgdesc.queue_last)
msg = msgdesc.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++;
}
/*
* Each target uvhub (i.e. a uvhub that has 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 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 = read_mmr_misc_control(pnode);
/*
* 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 &= ~(1L << SOFTACK_MSHIFT);
write_mmr_misc_control(pnode, mmr_image);
/*
* Set the 4-bit period.
*/
mmr_image &= ~((unsigned long)0xf << SOFTACK_PSHIFT);
mmr_image |= (SOFTACK_TIMEOUT_PERIOD << SOFTACK_PSHIFT);
write_mmr_misc_control(pnode, mmr_image);
/*
* UV1:
* 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 |= (1L << SOFTACK_MSHIFT);
if (is_uv2_hub()) {
/* do not touch the legacy mode bit */
/* hw bug workaround; do not use extended status */
mmr_image &= ~(1L << UV2_EXT_SHFT);
} else if (is_uv3_hub()) {
mmr_image &= ~(1L << PREFETCH_HINT_SHFT);
mmr_image |= (1L << SB_STATUS_SHFT);
}
write_mmr_misc_control(pnode, mmr_image);
}
}
static void *ptc_seq_start(struct seq_file *file, loff_t *offset)
{
if (*offset < num_possible_cpus())
return offset;
return NULL;
}
static void *ptc_seq_next(struct seq_file *file, void *data, loff_t *offset)
{
(*offset)++;
if (*offset < num_possible_cpus())
return offset;
return NULL;
}
static void ptc_seq_stop(struct seq_file *file, void *data)
{
}
/*
* Display the statistics thru /proc/sgi_uv/ptc_statistics
* 'data' points to the cpu number
* Note: see the descriptions in stat_description[].
*/
static int ptc_seq_show(struct seq_file *file, void *data)
{
struct ptc_stats *stat;
struct bau_control *bcp;
int cpu;
cpu = *(loff_t *)data;
if (!cpu) {
seq_puts(file,
"# cpu bauoff sent stime self locals remotes ncpus localhub ");
seq_puts(file, "remotehub numuvhubs numuvhubs16 numuvhubs8 ");
seq_puts(file,
"numuvhubs4 numuvhubs2 numuvhubs1 dto snacks retries ");
seq_puts(file,
"rok resetp resett giveup sto bz throt disable ");
seq_puts(file,
"enable wars warshw warwaits enters ipidis plugged ");
seq_puts(file,
"ipiover glim cong swack recv rtime all one mult ");
seq_puts(file, "none retry canc nocan reset rcan\n");
}
if (cpu < num_possible_cpus() && cpu_online(cpu)) {
bcp = &per_cpu(bau_control, cpu);
if (bcp->nobau) {
seq_printf(file, "cpu %d bau disabled\n", cpu);
return 0;
}
stat = bcp->statp;
/* source side statistics */
seq_printf(file,
"cpu %d %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
cpu, bcp->nobau, 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 %ld ",
stat->s_ntarguvhub8, stat->s_ntarguvhub4,
stat->s_ntarguvhub2, stat->s_ntarguvhub1,
stat->s_dtimeout, stat->s_strongnacks);
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);
seq_printf(file, "%ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
stat->s_bau_disabled, stat->s_bau_reenabled,
stat->s_uv2_wars, stat->s_uv2_wars_hw,
stat->s_uv2_war_waits, stat->s_enters,
stat->s_ipifordisabled, stat->s_plugged,
stat->s_overipilimit, stat->s_giveuplimit,
stat->s_congested);
/* destination side statistics */
seq_printf(file,
"%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n",
ops.read_g_sw_ack(uv_cpu_to_pnode(cpu)),
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);
}
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 %d\n",
"max_concur plugged_delay plugsb4reset timeoutsb4reset",
"ipi_reset_limit complete_threshold congested_response_us",
"congested_reps disabled_period giveup_limit",
max_concurr, plugged_delay, plugsb4reset,
timeoutsb4reset, ipi_reset_limit, complete_threshold,
congested_respns_us, congested_reps, disabled_period,
giveup_limit);
if (!buf)
return -ENOMEM;
ret = simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
kfree(buf);
return ret;
}
/*
* handle a write to /proc/sgi_uv/ptc_statistics
* -1: reset the statistics
* 0: display meaning of the statistics
*/
static ssize_t ptc_proc_write(struct file *file, const char __user *user,
size_t count, loff_t *data)
{
int cpu;
int i;
int elements;
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 (!strcmp(optstr, "on")) {
set_bau_on();
return count;
} else if (!strcmp(optstr, "off")) {
set_bau_off();
return count;
}
if (kstrtol(optstr, 10, &input_arg) < 0) {
pr_debug("%s is invalid\n", optstr);
return -EINVAL;
}
if (input_arg == 0) {
elements = ARRAY_SIZE(stat_description);
pr_debug("# cpu: cpu number\n");
pr_debug("Sender statistics:\n");
for (i = 0; i < elements; i++)
pr_debug("%s\n", stat_description[i]);
} 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;
}
}
}
/*
* Parse the values written to /sys/kernel/debug/sgi_uv/bau_tunables.
* Zero values reset them to defaults.
*/
static int parse_tunables_write(struct bau_control *bcp, char *instr,
int count)
{
char *p;
char *q;
int cnt = 0;
int val;
int e = ARRAY_SIZE(tunables);
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 != e) {
pr_info("bau tunable error: should be %d values\n", e);
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_concurr = MAX_BAU_CONCURRENT;
max_concurr_const = MAX_BAU_CONCURRENT;
continue;
}
if (val < 1 || val > bcp->cpus_in_uvhub) {
pr_debug(
"Error: BAU max concurrent %d is invalid\n",
val);
return -EINVAL;
}
max_concurr = val;
max_concurr_const = val;
continue;
default:
if (val == 0)
*tunables[cnt].tunp = tunables[cnt].deflt;
else
*tunables[cnt].tunp = val;
continue;
}
}
return 0;
}
/*
* Handle a write to debugfs. (/sys/kernel/debug/sgi_uv/bau_tunables)
*/
static ssize_t tunables_write(struct file *file, const char __user *user,
size_t count, loff_t *data)
{
int cpu;
int ret;
char instr[100];
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';
cpu = get_cpu();
bcp = &per_cpu(bau_control, cpu);
ret = parse_tunables_write(bcp, instr, count);
put_cpu();
if (ret)
return ret;
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
bcp->max_concurr = max_concurr;
bcp->max_concurr_const = max_concurr;
bcp->plugged_delay = plugged_delay;
bcp->plugsb4reset = plugsb4reset;
bcp->timeoutsb4reset = timeoutsb4reset;
bcp->ipi_reset_limit = ipi_reset_limit;
bcp->complete_threshold = complete_threshold;
bcp->cong_response_us = congested_respns_us;
bcp->cong_reps = congested_reps;
bcp->disabled_period = sec_2_cycles(disabled_period);
bcp->giveup_limit = giveup_limit;
}
return count;
}
static const struct seq_operations uv_ptc_seq_ops = {
.start = ptc_seq_start,
.next = ptc_seq_next,
.stop = ptc_seq_stop,
.show = ptc_seq_show
};
static int 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 = ptc_proc_open,
.read = seq_read,
.write = 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) {
pr_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) {
pr_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) {
pr_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 activation_descriptor_init(int node, int pnode, int base_pnode)
{
int i;
int cpu;
int uv1 = 0;
unsigned long gpa;
unsigned long m;
unsigned long n;
size_t dsize;
struct bau_desc *bau_desc;
struct bau_desc *bd2;
struct uv1_bau_msg_header *uv1_hdr;
struct uv2_3_bau_msg_header *uv2_3_hdr;
struct bau_control *bcp;
/*
* each bau_desc is 64 bytes; there are 8 (ITEMS_PER_DESC)
* per cpu; and one per cpu on the uvhub (ADP_SZ)
*/
dsize = sizeof(struct bau_desc) * ADP_SZ * ITEMS_PER_DESC;
bau_desc = kmalloc_node(dsize, GFP_KERNEL, node);
BUG_ON(!bau_desc);
gpa = uv_gpa(bau_desc);
n = uv_gpa_to_gnode(gpa);
m = ops.bau_gpa_to_offset(gpa);
if (is_uv1_hub())
uv1 = 1;
/* the 14-bit pnode */
write_mmr_descriptor_base(pnode,
(n << UVH_LB_BAU_SB_DESCRIPTOR_BASE_NODE_ID_SHFT | m));
/*
* Initializing all 8 (ITEMS_PER_DESC) 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 < (ADP_SZ * ITEMS_PER_DESC); i++, bd2++) {
memset(bd2, 0, sizeof(struct bau_desc));
if (uv1) {
uv1_hdr = &bd2->header.uv1_hdr;
uv1_hdr->swack_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.
*/
uv1_hdr->base_dest_nasid =
UV_PNODE_TO_NASID(base_pnode);
uv1_hdr->dest_subnodeid = UV_LB_SUBNODEID;
uv1_hdr->command = UV_NET_ENDPOINT_INTD;
uv1_hdr->int_both = 1;
/*
* all others need to be set to zero:
* fairness chaining multilevel count replied_to
*/
} else {
/*
* BIOS uses legacy mode, but uv2 and uv3 hardware always
* uses native mode for selective broadcasts.
*/
uv2_3_hdr = &bd2->header.uv2_3_hdr;
uv2_3_hdr->swack_flag = 1;
uv2_3_hdr->base_dest_nasid =
UV_PNODE_TO_NASID(base_pnode);
uv2_3_hdr->dest_subnodeid = UV_LB_SUBNODEID;
uv2_3_hdr->command = UV_NET_ENDPOINT_INTD;
}
}
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 pq_init(int node, int pnode)
{
int cpu;
size_t plsize;
char *cp;
void *vp;
unsigned long gnode, first, last, tail;
struct bau_pq_entry *pqp;
struct bau_control *bcp;
plsize = (DEST_Q_SIZE + 1) * sizeof(struct bau_pq_entry);
vp = kmalloc_node(plsize, GFP_KERNEL, node);
pqp = (struct bau_pq_entry *)vp;
BUG_ON(!pqp);
cp = (char *)pqp + 31;
pqp = (struct bau_pq_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->queue_first = pqp;
bcp->bau_msg_head = pqp;
bcp->queue_last = pqp + (DEST_Q_SIZE - 1);
}
first = ops.bau_gpa_to_offset(uv_gpa(pqp));
last = ops.bau_gpa_to_offset(uv_gpa(pqp + (DEST_Q_SIZE - 1)));
/*
* Pre UV4, the gnode is required to locate the payload queue
* and the payload queue tail must be maintained by the kernel.
*/
bcp = &per_cpu(bau_control, smp_processor_id());
if (bcp->uvhub_version <= UV_BAU_V3) {
tail = first;
gnode = uv_gpa_to_gnode(uv_gpa(pqp));
first = (gnode << UV_PAYLOADQ_GNODE_SHIFT) | tail;
write_mmr_payload_tail(pnode, tail);
}
ops.write_payload_first(pnode, first);
ops.write_payload_last(pnode, last);
/* in effect, all msg_type's are set to MSG_NOOP */
memset(pqp, 0, sizeof(struct bau_pq_entry) * DEST_Q_SIZE);
}
/*
* Initialization of each UV hub's structures
*/
static void __init 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);
activation_descriptor_init(node, pnode, base_pnode);
pq_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;
write_mmr_data_config(pnode, ((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 to 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;
if (is_uv1_hub()) {
mult1 = SOFTACK_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;
ts_ns = timeout_base_ns[index];
ts_ns *= (mult1 * mult2);
ret = ts_ns / 1000;
} else {
/* same destination timeout for uv2 and uv3 */
/* 4 bits 0/1 for 10/80us base, 3 bits of multiplier */
mmr_image = uv_read_local_mmr(UVH_LB_BAU_MISC_CONTROL);
mmr_image = (mmr_image & UV_SA_MASK) >> UV_SA_SHFT;
if (mmr_image & (1L << UV2_ACK_UNITS_SHFT))
base = 80;
else
base = 10;
mult1 = mmr_image & UV2_ACK_MASK;
ret = mult1 * base;
}
return ret;
}
static void __init init_per_cpu_tunables(void)
{
int cpu;
struct bau_control *bcp;
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
bcp->baudisabled = 0;
if (nobau)
bcp->nobau = true;
bcp->statp = &per_cpu(ptcstats, cpu);
/* time interval to catch a hardware stay-busy bug */
bcp->timeout_interval = usec_2_cycles(2*timeout_us);
bcp->max_concurr = max_concurr;
bcp->max_concurr_const = max_concurr;
bcp->plugged_delay = plugged_delay;
bcp->plugsb4reset = plugsb4reset;
bcp->timeoutsb4reset = timeoutsb4reset;
bcp->ipi_reset_limit = ipi_reset_limit;
bcp->complete_threshold = complete_threshold;
bcp->cong_response_us = congested_respns_us;
bcp->cong_reps = congested_reps;
bcp->disabled_period = sec_2_cycles(disabled_period);
bcp->giveup_limit = giveup_limit;
spin_lock_init(&bcp->queue_lock);
spin_lock_init(&bcp->uvhub_lock);
spin_lock_init(&bcp->disable_lock);
}
}
/*
* Scan all cpus to collect blade and socket summaries.
*/
static int __init get_cpu_topology(int base_pnode,
struct uvhub_desc *uvhub_descs,
unsigned char *uvhub_mask)
{
int cpu;
int pnode;
int uvhub;
int socket;
struct bau_control *bcp;
struct uvhub_desc *bdp;
struct socket_desc *sdp;
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_pnode) >= UV_DISTRIBUTION_SIZE) {
pr_emerg(
"cpu %d pnode %d-%d beyond %d; BAU disabled\n",
cpu, pnode, base_pnode, UV_DISTRIBUTION_SIZE);
return 1;
}
bcp->osnode = cpu_to_node(cpu);
bcp->partition_base_pnode = 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) {
pr_emerg("%d cpus per socket invalid\n",
sdp->num_cpus);
return 1;
}
}
return 0;
}
/*
* Each socket is to get a local array of pnodes/hubs.
*/
static void make_per_cpu_thp(struct bau_control *smaster)
{
int cpu;
size_t hpsz = sizeof(struct hub_and_pnode) * num_possible_cpus();
smaster->thp = kmalloc_node(hpsz, GFP_KERNEL, smaster->osnode);
memset(smaster->thp, 0, hpsz);
for_each_present_cpu(cpu) {
smaster->thp[cpu].pnode = uv_cpu_hub_info(cpu)->pnode;
smaster->thp[cpu].uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
}
}
/*
* Each uvhub is to get a local cpumask.
*/
static void make_per_hub_cpumask(struct bau_control *hmaster)
{
int sz = sizeof(cpumask_t);
hmaster->cpumask = kzalloc_node(sz, GFP_KERNEL, hmaster->osnode);
}
/*
* Initialize all the per_cpu information for the cpu's on a given socket,
* given what has been gathered into the socket_desc struct.
* And reports the chosen hub and socket masters back to the caller.
*/
static int scan_sock(struct socket_desc *sdp, struct uvhub_desc *bdp,
struct bau_control **smasterp,
struct bau_control **hmasterp)
{
int i, cpu, uvhub_cpu;
struct bau_control *bcp;
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) {
*smasterp = bcp;
if (!(*hmasterp))
*hmasterp = bcp;
}
bcp->cpus_in_uvhub = bdp->num_cpus;
bcp->cpus_in_socket = sdp->num_cpus;
bcp->socket_master = *smasterp;
bcp->uvhub = bdp->uvhub;
if (is_uv1_hub())
bcp->uvhub_version = UV_BAU_V1;
else if (is_uv2_hub())
bcp->uvhub_version = UV_BAU_V2;
else if (is_uv3_hub())
bcp->uvhub_version = UV_BAU_V3;
else if (is_uv4_hub())
bcp->uvhub_version = UV_BAU_V4;
else {
pr_emerg("uvhub version not 1, 2, 3, or 4\n");
return 1;
}
bcp->uvhub_master = *hmasterp;
uvhub_cpu = uv_cpu_blade_processor_id(cpu);
bcp->uvhub_cpu = uvhub_cpu;
/*
* The ERROR and BUSY status registers are located pairwise over
* the STATUS_0 and STATUS_1 mmrs; each an array[32] of 2 bits.
*/
if (uvhub_cpu < UV_CPUS_PER_AS) {
bcp->status_mmr = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
bcp->status_index = uvhub_cpu * UV_ACT_STATUS_SIZE;
} else {
bcp->status_mmr = UVH_LB_BAU_SB_ACTIVATION_STATUS_1;
bcp->status_index = (uvhub_cpu - UV_CPUS_PER_AS)
* UV_ACT_STATUS_SIZE;
}
if (bcp->uvhub_cpu >= MAX_CPUS_PER_UVHUB) {
pr_emerg("%d cpus per uvhub invalid\n",
bcp->uvhub_cpu);
return 1;
}
}
return 0;
}
/*
* Summarize the blade and socket topology into the per_cpu structures.
*/
static int __init summarize_uvhub_sockets(int nuvhubs,
struct uvhub_desc *uvhub_descs,
unsigned char *uvhub_mask)
{
int socket;
int uvhub;
unsigned short socket_mask;
for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
struct uvhub_desc *bdp;
struct bau_control *smaster = NULL;
struct bau_control *hmaster = NULL;
if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
continue;
bdp = &uvhub_descs[uvhub];
socket_mask = bdp->socket_mask;
socket = 0;
while (socket_mask) {
struct socket_desc *sdp;
if ((socket_mask & 1)) {
sdp = &bdp->socket[socket];
if (scan_sock(sdp, bdp, &smaster, &hmaster))
return 1;
make_per_cpu_thp(smaster);
}
socket++;
socket_mask = (socket_mask >> 1);
}
make_per_hub_cpumask(hmaster);
}
return 0;
}
/*
* initialize the bau_control structure for each cpu
*/
static int __init init_per_cpu(int nuvhubs, int base_part_pnode)
{
unsigned char *uvhub_mask;
void *vp;
struct uvhub_desc *uvhub_descs;
if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub())
timeout_us = calculate_destination_timeout();
vp = kmalloc_array(nuvhubs, sizeof(struct uvhub_desc), GFP_KERNEL);
uvhub_descs = (struct uvhub_desc *)vp;
memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
if (get_cpu_topology(base_part_pnode, uvhub_descs, uvhub_mask))
goto fail;
if (summarize_uvhub_sockets(nuvhubs, uvhub_descs, uvhub_mask))
goto fail;
kfree(uvhub_descs);
kfree(uvhub_mask);
init_per_cpu_tunables();
return 0;
fail:
kfree(uvhub_descs);
kfree(uvhub_mask);
return 1;
}
static const struct bau_operations uv1_bau_ops __initconst = {
.bau_gpa_to_offset = uv_gpa_to_offset,
.read_l_sw_ack = read_mmr_sw_ack,
.read_g_sw_ack = read_gmmr_sw_ack,
.write_l_sw_ack = write_mmr_sw_ack,
.write_g_sw_ack = write_gmmr_sw_ack,
.write_payload_first = write_mmr_payload_first,
.write_payload_last = write_mmr_payload_last,
.wait_completion = uv1_wait_completion,
};
static const struct bau_operations uv2_3_bau_ops __initconst = {
.bau_gpa_to_offset = uv_gpa_to_offset,
.read_l_sw_ack = read_mmr_sw_ack,
.read_g_sw_ack = read_gmmr_sw_ack,
.write_l_sw_ack = write_mmr_sw_ack,
.write_g_sw_ack = write_gmmr_sw_ack,
.write_payload_first = write_mmr_payload_first,
.write_payload_last = write_mmr_payload_last,
.wait_completion = uv2_3_wait_completion,
};
static const struct bau_operations uv4_bau_ops __initconst = {
.bau_gpa_to_offset = uv_gpa_to_soc_phys_ram,
.read_l_sw_ack = read_mmr_proc_sw_ack,
.read_g_sw_ack = read_gmmr_proc_sw_ack,
.write_l_sw_ack = write_mmr_proc_sw_ack,
.write_g_sw_ack = write_gmmr_proc_sw_ack,
.write_payload_first = write_mmr_proc_payload_first,
.write_payload_last = write_mmr_proc_payload_last,
.wait_completion = uv4_wait_completion,
};
/*
* Initialization of BAU-related structures
*/
static int __init uv_bau_init(void)
{
int uvhub;
int pnode;
int nuvhubs;
int cur_cpu;
int cpus;
int vector;
cpumask_var_t *mask;
if (!is_uv_system())
return 0;
if (is_uv4_hub())
ops = uv4_bau_ops;
else if (is_uv3_hub())
ops = uv2_3_bau_ops;
else if (is_uv2_hub())
ops = uv2_3_bau_ops;
else if (is_uv1_hub())
ops = uv1_bau_ops;
nuvhubs = uv_num_possible_blades();
if (nuvhubs < 2) {
pr_crit("UV: BAU disabled - insufficient hub count\n");
goto err_bau_disable;
}
for_each_possible_cpu(cur_cpu) {
mask = &per_cpu(uv_flush_tlb_mask, cur_cpu);
zalloc_cpumask_var_node(mask, GFP_KERNEL, cpu_to_node(cur_cpu));
}
uv_base_pnode = 0x7fffffff;
for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
cpus = uv_blade_nr_possible_cpus(uvhub);
if (cpus && (uv_blade_to_pnode(uvhub) < uv_base_pnode))
uv_base_pnode = uv_blade_to_pnode(uvhub);
}
/* software timeouts are not supported on UV4 */
if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub())
enable_timeouts();
if (init_per_cpu(nuvhubs, uv_base_pnode)) {
pr_crit("UV: BAU disabled - per CPU init failed\n");
goto err_bau_disable;
}
vector = UV_BAU_MESSAGE;
for_each_possible_blade(uvhub) {
if (uv_blade_nr_possible_cpus(uvhub))
init_uvhub(uvhub, vector, uv_base_pnode);
}
for_each_possible_blade(uvhub) {
if (uv_blade_nr_possible_cpus(uvhub)) {
unsigned long val;
unsigned long mmr;
pnode = uv_blade_to_pnode(uvhub);
/* INIT the bau */
val = 1L << 63;
write_gmmr_activation(pnode, val);
mmr = 1; /* should be 1 to broadcast to both sockets */
if (!is_uv1_hub())
write_mmr_data_broadcast(pnode, mmr);
}
}
return 0;
err_bau_disable:
for_each_possible_cpu(cur_cpu)
free_cpumask_var(per_cpu(uv_flush_tlb_mask, cur_cpu));
set_bau_off();
nobau_perm = 1;
return -EINVAL;
}
core_initcall(uv_bau_init);
fs_initcall(uv_ptc_init);