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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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Pull update-tlbflush-sn into release branch
This commit is contained in:
Tony Luck
commit
df080e7c94
@ -5,7 +5,7 @@
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
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* Copyright (C) 2000-2006 Silicon Graphics, Inc. All rights reserved.
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*/
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#include <linux/init.h>
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@ -46,104 +46,28 @@ DECLARE_PER_CPU(struct ptc_stats, ptcstats);
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static __cacheline_aligned DEFINE_SPINLOCK(sn2_global_ptc_lock);
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void sn2_ptc_deadlock_recovery(short *, short, int, volatile unsigned long *, unsigned long data0,
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volatile unsigned long *, unsigned long data1);
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void sn2_ptc_deadlock_recovery(short *, short, short, int, volatile unsigned long *, unsigned long,
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volatile unsigned long *, unsigned long);
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#ifdef DEBUG_PTC
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/*
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* ptctest:
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*
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* xyz - 3 digit hex number:
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* x - Force PTC purges to use shub:
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* 0 - no force
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* 1 - force
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* y - interupt enable
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* 0 - disable interrupts
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* 1 - leave interuupts enabled
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* z - type of lock:
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* 0 - global lock
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* 1 - node local lock
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* 2 - no lock
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*
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* Note: on shub1, only ptctest == 0 is supported. Don't try other values!
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* Note: some is the following is captured here to make degugging easier
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* (the macros make more sense if you see the debug patch - not posted)
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*/
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static unsigned int sn2_ptctest = 0;
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static int __init ptc_test(char *str)
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{
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get_option(&str, &sn2_ptctest);
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return 1;
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}
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__setup("ptctest=", ptc_test);
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static inline int ptc_lock(unsigned long *flagp)
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{
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unsigned long opt = sn2_ptctest & 255;
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switch (opt) {
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case 0x00:
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spin_lock_irqsave(&sn2_global_ptc_lock, *flagp);
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break;
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case 0x01:
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spin_lock_irqsave(&sn_nodepda->ptc_lock, *flagp);
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break;
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case 0x02:
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local_irq_save(*flagp);
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break;
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case 0x10:
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spin_lock(&sn2_global_ptc_lock);
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break;
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case 0x11:
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spin_lock(&sn_nodepda->ptc_lock);
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break;
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case 0x12:
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break;
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default:
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BUG();
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}
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return opt;
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}
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static inline void ptc_unlock(unsigned long flags, int opt)
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{
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switch (opt) {
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case 0x00:
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spin_unlock_irqrestore(&sn2_global_ptc_lock, flags);
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break;
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case 0x01:
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spin_unlock_irqrestore(&sn_nodepda->ptc_lock, flags);
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break;
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case 0x02:
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local_irq_restore(flags);
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break;
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case 0x10:
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spin_unlock(&sn2_global_ptc_lock);
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break;
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case 0x11:
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spin_unlock(&sn_nodepda->ptc_lock);
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break;
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case 0x12:
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break;
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default:
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BUG();
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}
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}
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#else
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#define sn2_ptctest 0
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#define local_node_uses_ptc_ga(sh1) ((sh1) ? 1 : 0)
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#define max_active_pio(sh1) ((sh1) ? 32 : 7)
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#define reset_max_active_on_deadlock() 1
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#define PTC_LOCK(sh1) ((sh1) ? &sn2_global_ptc_lock : &sn_nodepda->ptc_lock)
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static inline int ptc_lock(unsigned long *flagp)
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static inline void ptc_lock(int sh1, unsigned long *flagp)
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{
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spin_lock_irqsave(&sn2_global_ptc_lock, *flagp);
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return 0;
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spin_lock_irqsave(PTC_LOCK(sh1), *flagp);
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}
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static inline void ptc_unlock(unsigned long flags, int opt)
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static inline void ptc_unlock(int sh1, unsigned long flags)
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{
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spin_unlock_irqrestore(&sn2_global_ptc_lock, flags);
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spin_unlock_irqrestore(PTC_LOCK(sh1), flags);
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}
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#endif
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struct ptc_stats {
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unsigned long ptc_l;
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@ -151,27 +75,30 @@ struct ptc_stats {
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unsigned long shub_ptc_flushes;
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unsigned long nodes_flushed;
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unsigned long deadlocks;
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unsigned long deadlocks2;
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unsigned long lock_itc_clocks;
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unsigned long shub_itc_clocks;
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unsigned long shub_itc_clocks_max;
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unsigned long shub_ptc_flushes_not_my_mm;
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};
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static inline unsigned long wait_piowc(void)
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{
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volatile unsigned long *piows, zeroval;
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unsigned long ws;
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volatile unsigned long *piows;
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unsigned long zeroval, ws;
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piows = pda->pio_write_status_addr;
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zeroval = pda->pio_write_status_val;
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do {
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cpu_relax();
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} while (((ws = *piows) & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != zeroval);
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return ws;
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return (ws & SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_MASK) != 0;
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}
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void sn_tlb_migrate_finish(struct mm_struct *mm)
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{
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if (mm == current->mm)
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/* flush_tlb_mm is inefficient if more than 1 users of mm */
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if (mm == current->mm && mm && atomic_read(&mm->mm_users) == 1)
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flush_tlb_mm(mm);
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}
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@ -201,12 +128,14 @@ void
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sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
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unsigned long end, unsigned long nbits)
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{
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int i, opt, shub1, cnode, mynasid, cpu, lcpu = 0, nasid, flushed = 0;
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int mymm = (mm == current->active_mm && current->mm);
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int i, ibegin, shub1, cnode, mynasid, cpu, lcpu = 0, nasid;
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int mymm = (mm == current->active_mm && mm == current->mm);
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int use_cpu_ptcga;
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volatile unsigned long *ptc0, *ptc1;
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unsigned long itc, itc2, flags, data0 = 0, data1 = 0, rr_value;
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unsigned long itc, itc2, flags, data0 = 0, data1 = 0, rr_value, old_rr = 0;
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short nasids[MAX_NUMNODES], nix;
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nodemask_t nodes_flushed;
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int active, max_active, deadlock;
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nodes_clear(nodes_flushed);
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i = 0;
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@ -267,41 +196,56 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
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mynasid = get_nasid();
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use_cpu_ptcga = local_node_uses_ptc_ga(shub1);
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max_active = max_active_pio(shub1);
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itc = ia64_get_itc();
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opt = ptc_lock(&flags);
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ptc_lock(shub1, &flags);
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itc2 = ia64_get_itc();
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__get_cpu_var(ptcstats).lock_itc_clocks += itc2 - itc;
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__get_cpu_var(ptcstats).shub_ptc_flushes++;
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__get_cpu_var(ptcstats).nodes_flushed += nix;
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if (!mymm)
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__get_cpu_var(ptcstats).shub_ptc_flushes_not_my_mm++;
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if (use_cpu_ptcga && !mymm) {
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old_rr = ia64_get_rr(start);
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ia64_set_rr(start, (old_rr & 0xff) | (rr_value << 8));
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ia64_srlz_d();
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}
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wait_piowc();
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do {
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if (shub1)
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data1 = start | (1UL << SH1_PTC_1_START_SHFT);
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else
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data0 = (data0 & ~SH2_PTC_ADDR_MASK) | (start & SH2_PTC_ADDR_MASK);
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for (i = 0; i < nix; i++) {
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deadlock = 0;
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active = 0;
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for (ibegin = 0, i = 0; i < nix; i++) {
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nasid = nasids[i];
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if ((!(sn2_ptctest & 3)) && unlikely(nasid == mynasid && mymm)) {
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if (use_cpu_ptcga && unlikely(nasid == mynasid)) {
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ia64_ptcga(start, nbits << 2);
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ia64_srlz_i();
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} else {
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ptc0 = CHANGE_NASID(nasid, ptc0);
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if (ptc1)
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ptc1 = CHANGE_NASID(nasid, ptc1);
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pio_atomic_phys_write_mmrs(ptc0, data0, ptc1,
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data1);
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flushed = 1;
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pio_atomic_phys_write_mmrs(ptc0, data0, ptc1, data1);
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active++;
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}
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if (active >= max_active || i == (nix - 1)) {
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if ((deadlock = wait_piowc())) {
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sn2_ptc_deadlock_recovery(nasids, ibegin, i, mynasid, ptc0, data0, ptc1, data1);
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if (reset_max_active_on_deadlock())
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max_active = 1;
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}
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active = 0;
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ibegin = i + 1;
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}
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}
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if (flushed
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&& (wait_piowc() &
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(SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_MASK))) {
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sn2_ptc_deadlock_recovery(nasids, nix, mynasid, ptc0, data0, ptc1, data1);
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}
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start += (1UL << nbits);
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} while (start < end);
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itc2 = ia64_get_itc() - itc2;
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@ -309,7 +253,12 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
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if (itc2 > __get_cpu_var(ptcstats).shub_itc_clocks_max)
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__get_cpu_var(ptcstats).shub_itc_clocks_max = itc2;
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ptc_unlock(flags, opt);
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if (old_rr) {
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ia64_set_rr(start, old_rr);
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ia64_srlz_d();
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}
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ptc_unlock(shub1, flags);
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preempt_enable();
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}
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@ -321,27 +270,30 @@ sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
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* TLB flush transaction. The recovery sequence is somewhat tricky & is
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* coded in assembly language.
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*/
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void sn2_ptc_deadlock_recovery(short *nasids, short nix, int mynasid, volatile unsigned long *ptc0, unsigned long data0,
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void sn2_ptc_deadlock_recovery(short *nasids, short ib, short ie, int mynasid, volatile unsigned long *ptc0, unsigned long data0,
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volatile unsigned long *ptc1, unsigned long data1)
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{
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extern void sn2_ptc_deadlock_recovery_core(volatile unsigned long *, unsigned long,
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extern unsigned long sn2_ptc_deadlock_recovery_core(volatile unsigned long *, unsigned long,
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volatile unsigned long *, unsigned long, volatile unsigned long *, unsigned long);
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short nasid, i;
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unsigned long *piows, zeroval;
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unsigned long *piows, zeroval, n;
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__get_cpu_var(ptcstats).deadlocks++;
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piows = (unsigned long *) pda->pio_write_status_addr;
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zeroval = pda->pio_write_status_val;
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for (i=0; i < nix; i++) {
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for (i=ib; i <= ie; i++) {
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nasid = nasids[i];
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if (!(sn2_ptctest & 3) && nasid == mynasid)
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if (local_node_uses_ptc_ga(is_shub1()) && nasid == mynasid)
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continue;
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ptc0 = CHANGE_NASID(nasid, ptc0);
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if (ptc1)
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ptc1 = CHANGE_NASID(nasid, ptc1);
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sn2_ptc_deadlock_recovery_core(ptc0, data0, ptc1, data1, piows, zeroval);
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n = sn2_ptc_deadlock_recovery_core(ptc0, data0, ptc1, data1, piows, zeroval);
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__get_cpu_var(ptcstats).deadlocks2 += n;
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}
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}
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@ -452,20 +404,22 @@ static int sn2_ptc_seq_show(struct seq_file *file, void *data)
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cpu = *(loff_t *) data;
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if (!cpu) {
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seq_printf(file, "# ptc_l change_rid shub_ptc_flushes shub_nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max\n");
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seq_printf(file,
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"# cpu ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2\n");
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seq_printf(file, "# ptctest %d\n", sn2_ptctest);
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}
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if (cpu < NR_CPUS && cpu_online(cpu)) {
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stat = &per_cpu(ptcstats, cpu);
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seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l,
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seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l,
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stat->change_rid, stat->shub_ptc_flushes, stat->nodes_flushed,
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stat->deadlocks,
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1000 * stat->lock_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
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1000 * stat->shub_itc_clocks / per_cpu(cpu_info, cpu).cyc_per_usec,
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1000 * stat->shub_itc_clocks_max / per_cpu(cpu_info, cpu).cyc_per_usec);
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1000 * stat->shub_itc_clocks_max / per_cpu(cpu_info, cpu).cyc_per_usec,
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stat->shub_ptc_flushes_not_my_mm,
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stat->deadlocks2);
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}
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return 0;
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}
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@ -476,7 +430,7 @@ static struct seq_operations sn2_ptc_seq_ops = {
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.show = sn2_ptc_seq_show
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};
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int sn2_ptc_proc_open(struct inode *inode, struct file *file)
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static int sn2_ptc_proc_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &sn2_ptc_seq_ops);
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}
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