1710 lines
46 KiB
C
1710 lines
46 KiB
C
/*
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* SGI UltraViolet TLB flush routines.
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*
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* (c) 2008-2010 Cliff Wickman <cpw@sgi.com>, SGI.
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*
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* This code is released under the GNU General Public License version 2 or
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* later.
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*/
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/debugfs.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <asm/mmu_context.h>
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#include <asm/uv/uv.h>
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#include <asm/uv/uv_mmrs.h>
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#include <asm/uv/uv_hub.h>
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#include <asm/uv/uv_bau.h>
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#include <asm/apic.h>
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#include <asm/idle.h>
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#include <asm/tsc.h>
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#include <asm/irq_vectors.h>
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#include <asm/timer.h>
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/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
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static int timeout_base_ns[] = {
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20,
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160,
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1280,
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10240,
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81920,
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655360,
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5242880,
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167772160
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};
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static int timeout_us;
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static int nobau;
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static int baudisabled;
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static spinlock_t disable_lock;
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static cycles_t congested_cycles;
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/* tunables: */
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static int max_bau_concurrent = MAX_BAU_CONCURRENT;
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static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT;
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static int plugged_delay = PLUGGED_DELAY;
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static int plugsb4reset = PLUGSB4RESET;
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static int timeoutsb4reset = TIMEOUTSB4RESET;
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static int ipi_reset_limit = IPI_RESET_LIMIT;
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static int complete_threshold = COMPLETE_THRESHOLD;
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static int congested_response_us = CONGESTED_RESPONSE_US;
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static int congested_reps = CONGESTED_REPS;
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static int congested_period = CONGESTED_PERIOD;
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static struct dentry *tunables_dir;
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static struct dentry *tunables_file;
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static int __init setup_nobau(char *arg)
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{
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nobau = 1;
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return 0;
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}
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early_param("nobau", setup_nobau);
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/* base pnode in this partition */
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static int uv_partition_base_pnode __read_mostly;
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/* position of pnode (which is nasid>>1): */
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static int uv_nshift __read_mostly;
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static unsigned long uv_mmask __read_mostly;
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static DEFINE_PER_CPU(struct ptc_stats, ptcstats);
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static DEFINE_PER_CPU(struct bau_control, bau_control);
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static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask);
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/*
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* Determine the first node on a uvhub. 'Nodes' are used for kernel
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* memory allocation.
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*/
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static int __init uvhub_to_first_node(int uvhub)
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{
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int node, b;
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for_each_online_node(node) {
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b = uv_node_to_blade_id(node);
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if (uvhub == b)
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return node;
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}
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return -1;
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}
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/*
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* Determine the apicid of the first cpu on a uvhub.
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*/
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static int __init uvhub_to_first_apicid(int uvhub)
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{
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int cpu;
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for_each_present_cpu(cpu)
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if (uvhub == uv_cpu_to_blade_id(cpu))
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return per_cpu(x86_cpu_to_apicid, cpu);
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return -1;
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}
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/*
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* Free a software acknowledge hardware resource by clearing its Pending
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* bit. This will return a reply to the sender.
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* If the message has timed out, a reply has already been sent by the
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* hardware but the resource has not been released. In that case our
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* clear of the Timeout bit (as well) will free the resource. No reply will
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* be sent (the hardware will only do one reply per message).
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*/
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static inline void uv_reply_to_message(struct msg_desc *mdp,
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struct bau_control *bcp)
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{
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unsigned long dw;
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struct bau_payload_queue_entry *msg;
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msg = mdp->msg;
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if (!msg->canceled) {
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dw = (msg->sw_ack_vector << UV_SW_ACK_NPENDING) |
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msg->sw_ack_vector;
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uv_write_local_mmr(
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UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw);
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}
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msg->replied_to = 1;
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msg->sw_ack_vector = 0;
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}
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/*
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* Process the receipt of a RETRY message
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*/
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static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
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struct bau_control *bcp)
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{
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int i;
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int cancel_count = 0;
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int slot2;
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unsigned long msg_res;
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unsigned long mmr = 0;
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struct bau_payload_queue_entry *msg;
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struct bau_payload_queue_entry *msg2;
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struct ptc_stats *stat;
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msg = mdp->msg;
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stat = bcp->statp;
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stat->d_retries++;
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/*
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* cancel any message from msg+1 to the retry itself
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*/
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for (msg2 = msg+1, i = 0; i < DEST_Q_SIZE; msg2++, i++) {
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if (msg2 > mdp->va_queue_last)
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msg2 = mdp->va_queue_first;
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if (msg2 == msg)
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break;
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/* same conditions for cancellation as uv_do_reset */
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if ((msg2->replied_to == 0) && (msg2->canceled == 0) &&
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(msg2->sw_ack_vector) && ((msg2->sw_ack_vector &
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msg->sw_ack_vector) == 0) &&
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(msg2->sending_cpu == msg->sending_cpu) &&
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(msg2->msg_type != MSG_NOOP)) {
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slot2 = msg2 - mdp->va_queue_first;
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mmr = uv_read_local_mmr
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(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
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msg_res = msg2->sw_ack_vector;
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/*
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* This is a message retry; clear the resources held
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* by the previous message only if they timed out.
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* If it has not timed out we have an unexpected
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* situation to report.
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*/
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if (mmr & (msg_res << UV_SW_ACK_NPENDING)) {
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/*
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* is the resource timed out?
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* make everyone ignore the cancelled message.
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*/
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msg2->canceled = 1;
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stat->d_canceled++;
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cancel_count++;
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uv_write_local_mmr(
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UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
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(msg_res << UV_SW_ACK_NPENDING) |
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msg_res);
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}
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}
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}
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if (!cancel_count)
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stat->d_nocanceled++;
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}
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/*
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* Do all the things a cpu should do for a TLB shootdown message.
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* Other cpu's may come here at the same time for this message.
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*/
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static void uv_bau_process_message(struct msg_desc *mdp,
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struct bau_control *bcp)
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{
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int msg_ack_count;
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short socket_ack_count = 0;
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struct ptc_stats *stat;
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struct bau_payload_queue_entry *msg;
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struct bau_control *smaster = bcp->socket_master;
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/*
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* This must be a normal message, or retry of a normal message
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*/
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msg = mdp->msg;
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stat = bcp->statp;
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if (msg->address == TLB_FLUSH_ALL) {
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local_flush_tlb();
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stat->d_alltlb++;
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} else {
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__flush_tlb_one(msg->address);
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stat->d_onetlb++;
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}
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stat->d_requestee++;
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/*
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* One cpu on each uvhub has the additional job on a RETRY
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* of releasing the resource held by the message that is
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* being retried. That message is identified by sending
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* cpu number.
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*/
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if (msg->msg_type == MSG_RETRY && bcp == bcp->uvhub_master)
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uv_bau_process_retry_msg(mdp, bcp);
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/*
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* This is a sw_ack message, so we have to reply to it.
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* Count each responding cpu on the socket. This avoids
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* pinging the count's cache line back and forth between
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* the sockets.
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*/
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socket_ack_count = atomic_add_short_return(1, (struct atomic_short *)
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&smaster->socket_acknowledge_count[mdp->msg_slot]);
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if (socket_ack_count == bcp->cpus_in_socket) {
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/*
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* Both sockets dump their completed count total into
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* the message's count.
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*/
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smaster->socket_acknowledge_count[mdp->msg_slot] = 0;
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msg_ack_count = atomic_add_short_return(socket_ack_count,
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(struct atomic_short *)&msg->acknowledge_count);
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if (msg_ack_count == bcp->cpus_in_uvhub) {
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/*
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* All cpus in uvhub saw it; reply
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*/
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uv_reply_to_message(mdp, bcp);
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}
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}
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return;
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}
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/*
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* Determine the first cpu on a uvhub.
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*/
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static int uvhub_to_first_cpu(int uvhub)
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{
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int cpu;
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for_each_present_cpu(cpu)
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if (uvhub == uv_cpu_to_blade_id(cpu))
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return cpu;
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return -1;
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}
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/*
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* Last resort when we get a large number of destination timeouts is
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* to clear resources held by a given cpu.
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* Do this with IPI so that all messages in the BAU message queue
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* can be identified by their nonzero sw_ack_vector field.
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*
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* This is entered for a single cpu on the uvhub.
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* The sender want's this uvhub to free a specific message's
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* sw_ack resources.
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*/
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static void
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uv_do_reset(void *ptr)
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{
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int i;
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int slot;
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int count = 0;
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unsigned long mmr;
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unsigned long msg_res;
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struct bau_control *bcp;
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struct reset_args *rap;
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struct bau_payload_queue_entry *msg;
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struct ptc_stats *stat;
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bcp = &per_cpu(bau_control, smp_processor_id());
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rap = (struct reset_args *)ptr;
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stat = bcp->statp;
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stat->d_resets++;
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/*
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* We're looking for the given sender, and
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* will free its sw_ack resource.
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* If all cpu's finally responded after the timeout, its
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* message 'replied_to' was set.
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*/
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for (msg = bcp->va_queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) {
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/* uv_do_reset: same conditions for cancellation as
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uv_bau_process_retry_msg() */
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if ((msg->replied_to == 0) &&
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(msg->canceled == 0) &&
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(msg->sending_cpu == rap->sender) &&
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(msg->sw_ack_vector) &&
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(msg->msg_type != MSG_NOOP)) {
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/*
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* make everyone else ignore this message
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*/
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msg->canceled = 1;
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slot = msg - bcp->va_queue_first;
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count++;
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/*
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* only reset the resource if it is still pending
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*/
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mmr = uv_read_local_mmr
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(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
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msg_res = msg->sw_ack_vector;
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if (mmr & msg_res) {
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stat->d_rcanceled++;
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uv_write_local_mmr(
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UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
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(msg_res << UV_SW_ACK_NPENDING) |
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msg_res);
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}
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}
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}
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return;
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}
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/*
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* Use IPI to get all target uvhubs to release resources held by
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* a given sending cpu number.
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*/
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static void uv_reset_with_ipi(struct bau_target_uvhubmask *distribution,
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int sender)
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{
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int uvhub;
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int cpu;
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cpumask_t mask;
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struct reset_args reset_args;
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reset_args.sender = sender;
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cpus_clear(mask);
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/* find a single cpu for each uvhub in this distribution mask */
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for (uvhub = 0;
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uvhub < sizeof(struct bau_target_uvhubmask) * BITSPERBYTE;
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uvhub++) {
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if (!bau_uvhub_isset(uvhub, distribution))
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continue;
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/* find a cpu for this uvhub */
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cpu = uvhub_to_first_cpu(uvhub);
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cpu_set(cpu, mask);
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}
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/* IPI all cpus; Preemption is already disabled */
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smp_call_function_many(&mask, uv_do_reset, (void *)&reset_args, 1);
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return;
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}
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static inline unsigned long
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cycles_2_us(unsigned long long cyc)
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{
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unsigned long long ns;
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unsigned long us;
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ns = (cyc * per_cpu(cyc2ns, smp_processor_id()))
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>> CYC2NS_SCALE_FACTOR;
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us = ns / 1000;
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return us;
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}
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/*
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* wait for all cpus on this hub to finish their sends and go quiet
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* leaves uvhub_quiesce set so that no new broadcasts are started by
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* bau_flush_send_and_wait()
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*/
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static inline void
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quiesce_local_uvhub(struct bau_control *hmaster)
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{
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atomic_add_short_return(1, (struct atomic_short *)
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&hmaster->uvhub_quiesce);
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}
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/*
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* mark this quiet-requestor as done
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*/
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static inline void
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end_uvhub_quiesce(struct bau_control *hmaster)
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{
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atomic_add_short_return(-1, (struct atomic_short *)
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&hmaster->uvhub_quiesce);
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}
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/*
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* Wait for completion of a broadcast software ack message
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* return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
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*/
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static int uv_wait_completion(struct bau_desc *bau_desc,
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unsigned long mmr_offset, int right_shift, int this_cpu,
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struct bau_control *bcp, struct bau_control *smaster, long try)
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{
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unsigned long descriptor_status;
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cycles_t ttime;
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struct ptc_stats *stat = bcp->statp;
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struct bau_control *hmaster;
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hmaster = bcp->uvhub_master;
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/* spin on the status MMR, waiting for it to go idle */
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while ((descriptor_status = (((unsigned long)
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uv_read_local_mmr(mmr_offset) >>
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right_shift) & UV_ACT_STATUS_MASK)) !=
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DESC_STATUS_IDLE) {
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/*
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* Our software ack messages may be blocked because there are
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* no swack resources available. As long as none of them
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* has timed out hardware will NACK our message and its
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* state will stay IDLE.
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*/
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if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) {
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stat->s_stimeout++;
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return FLUSH_GIVEUP;
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} else if (descriptor_status ==
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DESC_STATUS_DESTINATION_TIMEOUT) {
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stat->s_dtimeout++;
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ttime = get_cycles();
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/*
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* Our retries may be blocked by all destination
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* swack resources being consumed, and a timeout
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* pending. In that case hardware returns the
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* ERROR that looks like a destination timeout.
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*/
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if (cycles_2_us(ttime - bcp->send_message) <
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timeout_us) {
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bcp->conseccompletes = 0;
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return FLUSH_RETRY_PLUGGED;
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}
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bcp->conseccompletes = 0;
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return FLUSH_RETRY_TIMEOUT;
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} else {
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/*
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* descriptor_status is still BUSY
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*/
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cpu_relax();
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}
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}
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bcp->conseccompletes++;
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return FLUSH_COMPLETE;
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}
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static inline cycles_t
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sec_2_cycles(unsigned long sec)
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{
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unsigned long ns;
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cycles_t cyc;
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ns = sec * 1000000000;
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cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
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return cyc;
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}
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/*
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* conditionally add 1 to *v, unless *v is >= u
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* return 0 if we cannot add 1 to *v because it is >= u
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* return 1 if we can add 1 to *v because it is < u
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* the add is atomic
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*
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* This is close to atomic_add_unless(), but this allows the 'u' value
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* to be lowered below the current 'v'. atomic_add_unless can only stop
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* on equal.
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*/
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static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
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{
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spin_lock(lock);
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if (atomic_read(v) >= u) {
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spin_unlock(lock);
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return 0;
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}
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atomic_inc(v);
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spin_unlock(lock);
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return 1;
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}
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|
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/*
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* Our retries are blocked by all destination swack resources being
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* in use, and a timeout is pending. In that case hardware immediately
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* returns the ERROR that looks like a destination timeout.
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*/
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static void
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destination_plugged(struct bau_desc *bau_desc, struct bau_control *bcp,
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struct bau_control *hmaster, struct ptc_stats *stat)
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{
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udelay(bcp->plugged_delay);
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bcp->plugged_tries++;
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if (bcp->plugged_tries >= bcp->plugsb4reset) {
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bcp->plugged_tries = 0;
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quiesce_local_uvhub(hmaster);
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spin_lock(&hmaster->queue_lock);
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uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
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spin_unlock(&hmaster->queue_lock);
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end_uvhub_quiesce(hmaster);
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bcp->ipi_attempts++;
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stat->s_resets_plug++;
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}
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}
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|
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static void
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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);
|