19a489f45SDavid Vrabel /* 29a489f45SDavid Vrabel * Xen event channels (2-level ABI) 39a489f45SDavid Vrabel * 49a489f45SDavid Vrabel * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 59a489f45SDavid Vrabel */ 69a489f45SDavid Vrabel 79a489f45SDavid Vrabel #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt 89a489f45SDavid Vrabel 99a489f45SDavid Vrabel #include <linux/linkage.h> 109a489f45SDavid Vrabel #include <linux/interrupt.h> 119a489f45SDavid Vrabel #include <linux/irq.h> 129a489f45SDavid Vrabel #include <linux/module.h> 139a489f45SDavid Vrabel 149a489f45SDavid Vrabel #include <asm/sync_bitops.h> 159a489f45SDavid Vrabel #include <asm/xen/hypercall.h> 169a489f45SDavid Vrabel #include <asm/xen/hypervisor.h> 179a489f45SDavid Vrabel 189a489f45SDavid Vrabel #include <xen/xen.h> 199a489f45SDavid Vrabel #include <xen/xen-ops.h> 209a489f45SDavid Vrabel #include <xen/events.h> 219a489f45SDavid Vrabel #include <xen/interface/xen.h> 229a489f45SDavid Vrabel #include <xen/interface/event_channel.h> 239a489f45SDavid Vrabel 249a489f45SDavid Vrabel #include "events_internal.h" 259a489f45SDavid Vrabel 269a489f45SDavid Vrabel /* 279a489f45SDavid Vrabel * Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be 289a489f45SDavid Vrabel * careful to only use bitops which allow for this (e.g 299a489f45SDavid Vrabel * test_bit/find_first_bit and friends but not __ffs) and to pass 309a489f45SDavid Vrabel * BITS_PER_EVTCHN_WORD as the bitmask length. 319a489f45SDavid Vrabel */ 329a489f45SDavid Vrabel #define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8) 339a489f45SDavid Vrabel /* 349a489f45SDavid Vrabel * Make a bitmask (i.e. unsigned long *) of a xen_ulong_t 359a489f45SDavid Vrabel * array. Primarily to avoid long lines (hence the terse name). 369a489f45SDavid Vrabel */ 379a489f45SDavid Vrabel #define BM(x) (unsigned long *)(x) 389a489f45SDavid Vrabel /* Find the first set bit in a evtchn mask */ 399a489f45SDavid Vrabel #define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD) 409a489f45SDavid Vrabel 419a489f45SDavid Vrabel static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD], 429a489f45SDavid Vrabel cpu_evtchn_mask); 439a489f45SDavid Vrabel 44d0b075ffSDavid Vrabel static unsigned evtchn_2l_max_channels(void) 45d0b075ffSDavid Vrabel { 46d0b075ffSDavid Vrabel return NR_EVENT_CHANNELS; 47d0b075ffSDavid Vrabel } 48d0b075ffSDavid Vrabel 49ab9a1ccaSDavid Vrabel static void evtchn_2l_bind_to_cpu(struct irq_info *info, unsigned cpu) 509a489f45SDavid Vrabel { 519a489f45SDavid Vrabel clear_bit(info->evtchn, BM(per_cpu(cpu_evtchn_mask, info->cpu))); 529a489f45SDavid Vrabel set_bit(info->evtchn, BM(per_cpu(cpu_evtchn_mask, cpu))); 539a489f45SDavid Vrabel } 549a489f45SDavid Vrabel 55ab9a1ccaSDavid Vrabel static void evtchn_2l_clear_pending(unsigned port) 569a489f45SDavid Vrabel { 579a489f45SDavid Vrabel struct shared_info *s = HYPERVISOR_shared_info; 589a489f45SDavid Vrabel sync_clear_bit(port, BM(&s->evtchn_pending[0])); 599a489f45SDavid Vrabel } 609a489f45SDavid Vrabel 61ab9a1ccaSDavid Vrabel static void evtchn_2l_set_pending(unsigned port) 629a489f45SDavid Vrabel { 639a489f45SDavid Vrabel struct shared_info *s = HYPERVISOR_shared_info; 649a489f45SDavid Vrabel sync_set_bit(port, BM(&s->evtchn_pending[0])); 659a489f45SDavid Vrabel } 669a489f45SDavid Vrabel 67ab9a1ccaSDavid Vrabel static bool evtchn_2l_is_pending(unsigned port) 689a489f45SDavid Vrabel { 699a489f45SDavid Vrabel struct shared_info *s = HYPERVISOR_shared_info; 709a489f45SDavid Vrabel return sync_test_bit(port, BM(&s->evtchn_pending[0])); 719a489f45SDavid Vrabel } 729a489f45SDavid Vrabel 73ab9a1ccaSDavid Vrabel static bool evtchn_2l_test_and_set_mask(unsigned port) 749a489f45SDavid Vrabel { 759a489f45SDavid Vrabel struct shared_info *s = HYPERVISOR_shared_info; 769a489f45SDavid Vrabel return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0])); 779a489f45SDavid Vrabel } 789a489f45SDavid Vrabel 79ab9a1ccaSDavid Vrabel static void evtchn_2l_mask(unsigned port) 809a489f45SDavid Vrabel { 819a489f45SDavid Vrabel struct shared_info *s = HYPERVISOR_shared_info; 829a489f45SDavid Vrabel sync_set_bit(port, BM(&s->evtchn_mask[0])); 839a489f45SDavid Vrabel } 849a489f45SDavid Vrabel 85ab9a1ccaSDavid Vrabel static void evtchn_2l_unmask(unsigned port) 869a489f45SDavid Vrabel { 879a489f45SDavid Vrabel struct shared_info *s = HYPERVISOR_shared_info; 889a489f45SDavid Vrabel unsigned int cpu = get_cpu(); 899a489f45SDavid Vrabel int do_hypercall = 0, evtchn_pending = 0; 909a489f45SDavid Vrabel 919a489f45SDavid Vrabel BUG_ON(!irqs_disabled()); 929a489f45SDavid Vrabel 939a489f45SDavid Vrabel if (unlikely((cpu != cpu_from_evtchn(port)))) 949a489f45SDavid Vrabel do_hypercall = 1; 959a489f45SDavid Vrabel else { 969a489f45SDavid Vrabel /* 979a489f45SDavid Vrabel * Need to clear the mask before checking pending to 989a489f45SDavid Vrabel * avoid a race with an event becoming pending. 999a489f45SDavid Vrabel * 1009a489f45SDavid Vrabel * EVTCHNOP_unmask will only trigger an upcall if the 1019a489f45SDavid Vrabel * mask bit was set, so if a hypercall is needed 1029a489f45SDavid Vrabel * remask the event. 1039a489f45SDavid Vrabel */ 1049a489f45SDavid Vrabel sync_clear_bit(port, BM(&s->evtchn_mask[0])); 1059a489f45SDavid Vrabel evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0])); 1069a489f45SDavid Vrabel 1079a489f45SDavid Vrabel if (unlikely(evtchn_pending && xen_hvm_domain())) { 1089a489f45SDavid Vrabel sync_set_bit(port, BM(&s->evtchn_mask[0])); 1099a489f45SDavid Vrabel do_hypercall = 1; 1109a489f45SDavid Vrabel } 1119a489f45SDavid Vrabel } 1129a489f45SDavid Vrabel 1139a489f45SDavid Vrabel /* Slow path (hypercall) if this is a non-local port or if this is 1149a489f45SDavid Vrabel * an hvm domain and an event is pending (hvm domains don't have 1159a489f45SDavid Vrabel * their own implementation of irq_enable). */ 1169a489f45SDavid Vrabel if (do_hypercall) { 1179a489f45SDavid Vrabel struct evtchn_unmask unmask = { .port = port }; 1189a489f45SDavid Vrabel (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask); 1199a489f45SDavid Vrabel } else { 1209a489f45SDavid Vrabel struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu); 1219a489f45SDavid Vrabel 1229a489f45SDavid Vrabel /* 1239a489f45SDavid Vrabel * The following is basically the equivalent of 1249a489f45SDavid Vrabel * 'hw_resend_irq'. Just like a real IO-APIC we 'lose 1259a489f45SDavid Vrabel * the interrupt edge' if the channel is masked. 1269a489f45SDavid Vrabel */ 1279a489f45SDavid Vrabel if (evtchn_pending && 1289a489f45SDavid Vrabel !sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD, 1299a489f45SDavid Vrabel BM(&vcpu_info->evtchn_pending_sel))) 1309a489f45SDavid Vrabel vcpu_info->evtchn_upcall_pending = 1; 1319a489f45SDavid Vrabel } 1329a489f45SDavid Vrabel 1339a489f45SDavid Vrabel put_cpu(); 1349a489f45SDavid Vrabel } 1359a489f45SDavid Vrabel 1369a489f45SDavid Vrabel static DEFINE_PER_CPU(unsigned int, current_word_idx); 1379a489f45SDavid Vrabel static DEFINE_PER_CPU(unsigned int, current_bit_idx); 1389a489f45SDavid Vrabel 1399a489f45SDavid Vrabel /* 1409a489f45SDavid Vrabel * Mask out the i least significant bits of w 1419a489f45SDavid Vrabel */ 1429a489f45SDavid Vrabel #define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i)) 1439a489f45SDavid Vrabel 1449a489f45SDavid Vrabel static inline xen_ulong_t active_evtchns(unsigned int cpu, 1459a489f45SDavid Vrabel struct shared_info *sh, 1469a489f45SDavid Vrabel unsigned int idx) 1479a489f45SDavid Vrabel { 1489a489f45SDavid Vrabel return sh->evtchn_pending[idx] & 1499a489f45SDavid Vrabel per_cpu(cpu_evtchn_mask, cpu)[idx] & 1509a489f45SDavid Vrabel ~sh->evtchn_mask[idx]; 1519a489f45SDavid Vrabel } 1529a489f45SDavid Vrabel 1539a489f45SDavid Vrabel /* 1549a489f45SDavid Vrabel * Search the CPU's pending events bitmasks. For each one found, map 1559a489f45SDavid Vrabel * the event number to an irq, and feed it into do_IRQ() for handling. 1569a489f45SDavid Vrabel * 1579a489f45SDavid Vrabel * Xen uses a two-level bitmap to speed searching. The first level is 1589a489f45SDavid Vrabel * a bitset of words which contain pending event bits. The second 1599a489f45SDavid Vrabel * level is a bitset of pending events themselves. 1609a489f45SDavid Vrabel */ 161ab9a1ccaSDavid Vrabel static void evtchn_2l_handle_events(unsigned cpu) 1629a489f45SDavid Vrabel { 1639a489f45SDavid Vrabel int irq; 1649a489f45SDavid Vrabel xen_ulong_t pending_words; 1659a489f45SDavid Vrabel xen_ulong_t pending_bits; 1669a489f45SDavid Vrabel int start_word_idx, start_bit_idx; 1679a489f45SDavid Vrabel int word_idx, bit_idx; 1689a489f45SDavid Vrabel int i; 1699a489f45SDavid Vrabel struct irq_desc *desc; 1709a489f45SDavid Vrabel struct shared_info *s = HYPERVISOR_shared_info; 1719a489f45SDavid Vrabel struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu); 1729a489f45SDavid Vrabel 1739a489f45SDavid Vrabel /* Timer interrupt has highest priority. */ 1749a489f45SDavid Vrabel irq = irq_from_virq(cpu, VIRQ_TIMER); 1759a489f45SDavid Vrabel if (irq != -1) { 1769a489f45SDavid Vrabel unsigned int evtchn = evtchn_from_irq(irq); 1779a489f45SDavid Vrabel word_idx = evtchn / BITS_PER_LONG; 1789a489f45SDavid Vrabel bit_idx = evtchn % BITS_PER_LONG; 1799a489f45SDavid Vrabel if (active_evtchns(cpu, s, word_idx) & (1ULL << bit_idx)) { 1809a489f45SDavid Vrabel desc = irq_to_desc(irq); 1819a489f45SDavid Vrabel if (desc) 1829a489f45SDavid Vrabel generic_handle_irq_desc(irq, desc); 1839a489f45SDavid Vrabel } 1849a489f45SDavid Vrabel } 1859a489f45SDavid Vrabel 1869a489f45SDavid Vrabel /* 1879a489f45SDavid Vrabel * Master flag must be cleared /before/ clearing 1889a489f45SDavid Vrabel * selector flag. xchg_xen_ulong must contain an 1899a489f45SDavid Vrabel * appropriate barrier. 1909a489f45SDavid Vrabel */ 1919a489f45SDavid Vrabel pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0); 1929a489f45SDavid Vrabel 1939a489f45SDavid Vrabel start_word_idx = __this_cpu_read(current_word_idx); 1949a489f45SDavid Vrabel start_bit_idx = __this_cpu_read(current_bit_idx); 1959a489f45SDavid Vrabel 1969a489f45SDavid Vrabel word_idx = start_word_idx; 1979a489f45SDavid Vrabel 1989a489f45SDavid Vrabel for (i = 0; pending_words != 0; i++) { 1999a489f45SDavid Vrabel xen_ulong_t words; 2009a489f45SDavid Vrabel 2019a489f45SDavid Vrabel words = MASK_LSBS(pending_words, word_idx); 2029a489f45SDavid Vrabel 2039a489f45SDavid Vrabel /* 2049a489f45SDavid Vrabel * If we masked out all events, wrap to beginning. 2059a489f45SDavid Vrabel */ 2069a489f45SDavid Vrabel if (words == 0) { 2079a489f45SDavid Vrabel word_idx = 0; 2089a489f45SDavid Vrabel bit_idx = 0; 2099a489f45SDavid Vrabel continue; 2109a489f45SDavid Vrabel } 2119a489f45SDavid Vrabel word_idx = EVTCHN_FIRST_BIT(words); 2129a489f45SDavid Vrabel 2139a489f45SDavid Vrabel pending_bits = active_evtchns(cpu, s, word_idx); 2149a489f45SDavid Vrabel bit_idx = 0; /* usually scan entire word from start */ 2159a489f45SDavid Vrabel /* 2169a489f45SDavid Vrabel * We scan the starting word in two parts. 2179a489f45SDavid Vrabel * 2189a489f45SDavid Vrabel * 1st time: start in the middle, scanning the 2199a489f45SDavid Vrabel * upper bits. 2209a489f45SDavid Vrabel * 2219a489f45SDavid Vrabel * 2nd time: scan the whole word (not just the 2229a489f45SDavid Vrabel * parts skipped in the first pass) -- if an 2239a489f45SDavid Vrabel * event in the previously scanned bits is 2249a489f45SDavid Vrabel * pending again it would just be scanned on 2259a489f45SDavid Vrabel * the next loop anyway. 2269a489f45SDavid Vrabel */ 2279a489f45SDavid Vrabel if (word_idx == start_word_idx) { 2289a489f45SDavid Vrabel if (i == 0) 2299a489f45SDavid Vrabel bit_idx = start_bit_idx; 2309a489f45SDavid Vrabel } 2319a489f45SDavid Vrabel 2329a489f45SDavid Vrabel do { 2339a489f45SDavid Vrabel xen_ulong_t bits; 2349a489f45SDavid Vrabel int port; 2359a489f45SDavid Vrabel 2369a489f45SDavid Vrabel bits = MASK_LSBS(pending_bits, bit_idx); 2379a489f45SDavid Vrabel 2389a489f45SDavid Vrabel /* If we masked out all events, move on. */ 2399a489f45SDavid Vrabel if (bits == 0) 2409a489f45SDavid Vrabel break; 2419a489f45SDavid Vrabel 2429a489f45SDavid Vrabel bit_idx = EVTCHN_FIRST_BIT(bits); 2439a489f45SDavid Vrabel 2449a489f45SDavid Vrabel /* Process port. */ 2459a489f45SDavid Vrabel port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx; 246d0b075ffSDavid Vrabel irq = get_evtchn_to_irq(port); 2479a489f45SDavid Vrabel 2489a489f45SDavid Vrabel if (irq != -1) { 2499a489f45SDavid Vrabel desc = irq_to_desc(irq); 2509a489f45SDavid Vrabel if (desc) 2519a489f45SDavid Vrabel generic_handle_irq_desc(irq, desc); 2529a489f45SDavid Vrabel } 2539a489f45SDavid Vrabel 2549a489f45SDavid Vrabel bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD; 2559a489f45SDavid Vrabel 2569a489f45SDavid Vrabel /* Next caller starts at last processed + 1 */ 2579a489f45SDavid Vrabel __this_cpu_write(current_word_idx, 2589a489f45SDavid Vrabel bit_idx ? word_idx : 2599a489f45SDavid Vrabel (word_idx+1) % BITS_PER_EVTCHN_WORD); 2609a489f45SDavid Vrabel __this_cpu_write(current_bit_idx, bit_idx); 2619a489f45SDavid Vrabel } while (bit_idx != 0); 2629a489f45SDavid Vrabel 2639a489f45SDavid Vrabel /* Scan start_l1i twice; all others once. */ 2649a489f45SDavid Vrabel if ((word_idx != start_word_idx) || (i != 0)) 2659a489f45SDavid Vrabel pending_words &= ~(1UL << word_idx); 2669a489f45SDavid Vrabel 2679a489f45SDavid Vrabel word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD; 2689a489f45SDavid Vrabel } 2699a489f45SDavid Vrabel } 2709a489f45SDavid Vrabel 2719a489f45SDavid Vrabel irqreturn_t xen_debug_interrupt(int irq, void *dev_id) 2729a489f45SDavid Vrabel { 2739a489f45SDavid Vrabel struct shared_info *sh = HYPERVISOR_shared_info; 2749a489f45SDavid Vrabel int cpu = smp_processor_id(); 2759a489f45SDavid Vrabel xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu); 2769a489f45SDavid Vrabel int i; 2779a489f45SDavid Vrabel unsigned long flags; 2789a489f45SDavid Vrabel static DEFINE_SPINLOCK(debug_lock); 2799a489f45SDavid Vrabel struct vcpu_info *v; 2809a489f45SDavid Vrabel 2819a489f45SDavid Vrabel spin_lock_irqsave(&debug_lock, flags); 2829a489f45SDavid Vrabel 2839a489f45SDavid Vrabel printk("\nvcpu %d\n ", cpu); 2849a489f45SDavid Vrabel 2859a489f45SDavid Vrabel for_each_online_cpu(i) { 2869a489f45SDavid Vrabel int pending; 2879a489f45SDavid Vrabel v = per_cpu(xen_vcpu, i); 2889a489f45SDavid Vrabel pending = (get_irq_regs() && i == cpu) 2899a489f45SDavid Vrabel ? xen_irqs_disabled(get_irq_regs()) 2909a489f45SDavid Vrabel : v->evtchn_upcall_mask; 2919a489f45SDavid Vrabel printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i, 2929a489f45SDavid Vrabel pending, v->evtchn_upcall_pending, 2939a489f45SDavid Vrabel (int)(sizeof(v->evtchn_pending_sel)*2), 2949a489f45SDavid Vrabel v->evtchn_pending_sel); 2959a489f45SDavid Vrabel } 2969a489f45SDavid Vrabel v = per_cpu(xen_vcpu, cpu); 2979a489f45SDavid Vrabel 2989a489f45SDavid Vrabel printk("\npending:\n "); 2999a489f45SDavid Vrabel for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--) 3009a489f45SDavid Vrabel printk("%0*"PRI_xen_ulong"%s", 3019a489f45SDavid Vrabel (int)sizeof(sh->evtchn_pending[0])*2, 3029a489f45SDavid Vrabel sh->evtchn_pending[i], 3039a489f45SDavid Vrabel i % 8 == 0 ? "\n " : " "); 3049a489f45SDavid Vrabel printk("\nglobal mask:\n "); 3059a489f45SDavid Vrabel for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) 3069a489f45SDavid Vrabel printk("%0*"PRI_xen_ulong"%s", 3079a489f45SDavid Vrabel (int)(sizeof(sh->evtchn_mask[0])*2), 3089a489f45SDavid Vrabel sh->evtchn_mask[i], 3099a489f45SDavid Vrabel i % 8 == 0 ? "\n " : " "); 3109a489f45SDavid Vrabel 3119a489f45SDavid Vrabel printk("\nglobally unmasked:\n "); 3129a489f45SDavid Vrabel for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) 3139a489f45SDavid Vrabel printk("%0*"PRI_xen_ulong"%s", 3149a489f45SDavid Vrabel (int)(sizeof(sh->evtchn_mask[0])*2), 3159a489f45SDavid Vrabel sh->evtchn_pending[i] & ~sh->evtchn_mask[i], 3169a489f45SDavid Vrabel i % 8 == 0 ? "\n " : " "); 3179a489f45SDavid Vrabel 3189a489f45SDavid Vrabel printk("\nlocal cpu%d mask:\n ", cpu); 3199a489f45SDavid Vrabel for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--) 3209a489f45SDavid Vrabel printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2), 3219a489f45SDavid Vrabel cpu_evtchn[i], 3229a489f45SDavid Vrabel i % 8 == 0 ? "\n " : " "); 3239a489f45SDavid Vrabel 3249a489f45SDavid Vrabel printk("\nlocally unmasked:\n "); 3259a489f45SDavid Vrabel for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) { 3269a489f45SDavid Vrabel xen_ulong_t pending = sh->evtchn_pending[i] 3279a489f45SDavid Vrabel & ~sh->evtchn_mask[i] 3289a489f45SDavid Vrabel & cpu_evtchn[i]; 3299a489f45SDavid Vrabel printk("%0*"PRI_xen_ulong"%s", 3309a489f45SDavid Vrabel (int)(sizeof(sh->evtchn_mask[0])*2), 3319a489f45SDavid Vrabel pending, i % 8 == 0 ? "\n " : " "); 3329a489f45SDavid Vrabel } 3339a489f45SDavid Vrabel 3349a489f45SDavid Vrabel printk("\npending list:\n"); 3359a489f45SDavid Vrabel for (i = 0; i < NR_EVENT_CHANNELS; i++) { 3369a489f45SDavid Vrabel if (sync_test_bit(i, BM(sh->evtchn_pending))) { 3379a489f45SDavid Vrabel int word_idx = i / BITS_PER_EVTCHN_WORD; 3389a489f45SDavid Vrabel printk(" %d: event %d -> irq %d%s%s%s\n", 3399a489f45SDavid Vrabel cpu_from_evtchn(i), i, 340d0b075ffSDavid Vrabel get_evtchn_to_irq(i), 3419a489f45SDavid Vrabel sync_test_bit(word_idx, BM(&v->evtchn_pending_sel)) 3429a489f45SDavid Vrabel ? "" : " l2-clear", 3439a489f45SDavid Vrabel !sync_test_bit(i, BM(sh->evtchn_mask)) 3449a489f45SDavid Vrabel ? "" : " globally-masked", 3459a489f45SDavid Vrabel sync_test_bit(i, BM(cpu_evtchn)) 3469a489f45SDavid Vrabel ? "" : " locally-masked"); 3479a489f45SDavid Vrabel } 3489a489f45SDavid Vrabel } 3499a489f45SDavid Vrabel 3509a489f45SDavid Vrabel spin_unlock_irqrestore(&debug_lock, flags); 3519a489f45SDavid Vrabel 3529a489f45SDavid Vrabel return IRQ_HANDLED; 3539a489f45SDavid Vrabel } 354ab9a1ccaSDavid Vrabel 355ab9a1ccaSDavid Vrabel static const struct evtchn_ops evtchn_ops_2l = { 356d0b075ffSDavid Vrabel .max_channels = evtchn_2l_max_channels, 357d0b075ffSDavid Vrabel .nr_channels = evtchn_2l_max_channels, 358ab9a1ccaSDavid Vrabel .bind_to_cpu = evtchn_2l_bind_to_cpu, 359ab9a1ccaSDavid Vrabel .clear_pending = evtchn_2l_clear_pending, 360ab9a1ccaSDavid Vrabel .set_pending = evtchn_2l_set_pending, 361ab9a1ccaSDavid Vrabel .is_pending = evtchn_2l_is_pending, 362ab9a1ccaSDavid Vrabel .test_and_set_mask = evtchn_2l_test_and_set_mask, 363ab9a1ccaSDavid Vrabel .mask = evtchn_2l_mask, 364ab9a1ccaSDavid Vrabel .unmask = evtchn_2l_unmask, 365ab9a1ccaSDavid Vrabel .handle_events = evtchn_2l_handle_events, 366ab9a1ccaSDavid Vrabel }; 367ab9a1ccaSDavid Vrabel 368ab9a1ccaSDavid Vrabel void __init xen_evtchn_2l_init(void) 369ab9a1ccaSDavid Vrabel { 370ab9a1ccaSDavid Vrabel pr_info("Using 2-level ABI\n"); 371ab9a1ccaSDavid Vrabel evtchn_ops = &evtchn_ops_2l; 372ab9a1ccaSDavid Vrabel } 373