This patch contains the event set and multiplexing support.
--- linux-2.6.17.1.orig/perfmon/perfmon_sets.c 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.17.1/perfmon/perfmon_sets.c 2006-06-21 04:22:51.000000000 -0700
@@ -0,0 +1,840 @@
+/*
+ * perfmon_sets.c: perfmon2 event sets and multiplexing functions
+ *
+ * This file implements the perfmon2 interface which
+ * provides access to the hardware performance counters
+ * of the host processor.
+ *
+ * The initial version of perfmon.c was written by
+ * Ganesh Venkitachalam, IBM Corp.
+ *
+ * Then it was modified for perfmon-1.x by Stephane Eranian and
+ * David Mosberger, Hewlett Packard Co.
+ *
+ * Version Perfmon-2.x is a complete rewrite of perfmon-1.x
+ * by Stephane Eranian, Hewlett Packard Co.
+ *
+ * Copyright (c) 1999-2006 Hewlett-Packard Development Company, L.P.
+ * Contributed by Stephane Eranian <[email protected]>
+ * David Mosberger-Tang <[email protected]>
+ *
+ * More information about perfmon available at:
+ * http://www.hpl.hp.com/research/linux/perfmon
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/vmalloc.h>
+#include <linux/perfmon.h>
+#include <linux/pagemap.h>
+
+static kmem_cache_t *pfm_set_cachep;
+static kmem_cache_t *pfm_lg_set_cachep;
+
+/*
+ * reload reference overflow switch thresholds
+ */
+static void pfm_reload_switch_thresholds(struct pfm_event_set *set)
+{
+ u64 *mask;
+ u16 i, max_cnt_pmd, first_cnt_pmd;
+
+ mask = set->used_pmds;
+ first_cnt_pmd = pfm_pmu_conf->first_cnt_pmd;
+ max_cnt_pmd = pfm_pmu_conf->max_cnt_pmd;
+
+ for (i = first_cnt_pmd; i< max_cnt_pmd; i++) {
+ if (pfm_bv_isset(mask, i)) {
+ set->pmds[i].ovflsw_thres = set->pmds[i].ovflsw_ref_thres;
+ PFM_DBG("pmd%u set=%u ovflsw_thres=%llu",
+ i,
+ set->id,
+ (unsigned long long)set->pmds[i].ovflsw_thres);
+ }
+ }
+}
+
+
+/*
+ * ensures that all id_next sets exists such that the round-robin
+ * will work correctly, i.e., next dangling references.
+ */
+int pfm_prepare_sets(struct pfm_context *ctx, struct pfm_event_set *act_set)
+{
+ struct pfm_event_set *set1, *set2;
+ u16 max_cnt_pmd;
+#define is_last_set(s, c) ((s)->list.next == &(c)->list)
+
+ max_cnt_pmd = pfm_pmu_conf->max_cnt_pmd;
+
+ list_for_each_entry(set1, &ctx->list, list) {
+
+ if (is_last_set(set1, ctx))
+ set2 = list_entry(ctx->list.next,
+ struct pfm_event_set, list);
+ else
+ set2 = list_entry(set1->list.next,
+ struct pfm_event_set, list);
+ /*
+ * switch_next is used during actual switching
+ * so we prepare its value here. When no explicit next
+ * is requested, the field is initialized with the address
+ * of the next element in the ordered list
+ */
+ if (set1->flags & PFM_SETFL_EXPL_NEXT) {
+ list_for_each_entry(set2, &ctx->list, list) {
+ if (set2->id == set1->id_next)
+ break;
+ }
+ if (set2 == NULL) {
+ PFM_DBG("set%u points to set%u "
+ "which does not exist",
+ set1->id,
+ set1->id_next);
+ return -EINVAL;
+ }
+ }
+ /*
+ * update field used during actual switching
+ */
+ set1->sw_next = set2;
+
+ PFM_DBG("set%u sw_next=%u", set1->id, set2->id);
+
+ /*
+ * cleanup bitvectors
+ */
+ bitmap_zero(ulp(set1->ovfl_pmds), max_cnt_pmd);
+ bitmap_zero(ulp(set1->povfl_pmds), max_cnt_pmd);
+ set1->npend_ovfls = 0;
+ /*
+ * we cannot just use plain clear because of arch-specific flags
+ */
+ set1->priv_flags &= ~(PFM_SETFL_PRIV_MOD_BOTH|PFM_SETFL_PRIV_SWITCH);
+
+ /*
+ * reset activation and elapsed cycles
+ */
+ set1->duration = 0;
+
+ pfm_modview_begin(set1);
+
+ set1->view->set_runs = 0;
+
+ pfm_modview_end(set1);
+ }
+ /*
+ * setting PFM_CPUINFO_TIME_SWITCH, triggers
+ * further checking if __pfm_handle_switch_timeout().
+ * switch timeout is effectively decremented only when
+ * monitoring has been activated via pfm_start() or
+ * any user level equivalent.
+ */
+ if (act_set->flags & PFM_SETFL_OVFL_SWITCH) {
+ pfm_reload_switch_thresholds(act_set);
+ } else if (act_set->flags & PFM_SETFL_TIME_SWITCH) {
+ act_set->timeout = act_set->switch_timeout;
+ PFM_DBG("arming timeout for set%u", act_set->id);
+ if (ctx->flags.system)
+ __get_cpu_var(pfm_syst_info) = PFM_CPUINFO_TIME_SWITCH;
+ }
+
+ return 0;
+}
+
+/*
+ * called from *_timer_interrupt(). task == current
+ */
+void __pfm_handle_switch_timeout(void)
+{
+ struct pfm_event_set *set;
+ struct pfm_context *ctx;
+ unsigned long flags;
+
+ /*
+ * The timer tick check is operating on each
+ * CPU. Not all CPUs have time switching enabled
+ * hence we need to check.
+ */
+ ctx = __get_cpu_var(pmu_ctx);
+ if (ctx == NULL)
+ return;
+
+ spin_lock_irqsave(&ctx->lock, flags);
+
+ set = ctx->active_set;
+ BUG_ON(set == NULL);
+
+ /*
+ * we decrement only when attached and not masked or zombie
+ */
+ if (ctx->state != PFM_CTX_LOADED)
+ goto done;
+
+ /*
+ * do not decrement timeout unless monitoring is active.
+ */
+ if (ctx->flags.started == 0 && pfm_arch_is_active(ctx) == 0)
+ goto done;
+
+ set->timeout--;
+
+ __get_cpu_var(pfm_stats).pfm_handle_timeout_count++;
+
+ if (set->timeout == 0)
+ pfm_switch_sets(ctx, NULL, PFM_PMD_RESET_SHORT, 0);
+done:
+ spin_unlock_irqrestore(&ctx->lock, flags);
+}
+
+/*
+ *
+ * always operating on the current task
+ *
+ * input:
+ * - new_set: new set to switch to, if NULL follow normal chain
+ */
+void pfm_switch_sets(struct pfm_context *ctx,
+ struct pfm_event_set *new_set,
+ int reset_mode,
+ int no_restart)
+{
+ struct pfm_event_set *set;
+ u64 switch_count;
+ u64 now_itc, end_itc;
+ unsigned long info = 0;
+ u32 new_flags;
+ int is_system, state, is_active;
+
+ now_itc = pfm_arch_get_itc();
+ set = ctx->active_set;
+ is_active = ctx->flags.started || pfm_arch_is_active(ctx);
+
+ BUG_ON(ctx->flags.system == 0 && ctx->task != current);
+
+ /*
+ * if no set is explicitely requested,
+ * use the set_switch_next field
+ */
+ if (new_set == NULL) {
+ /*
+ * we use round-robin unless the user specified
+ * a particular set to go to.
+ */
+ new_set = set->sw_next;
+ BUG_ON(new_set == NULL);
+ }
+
+ PFM_DBG("state=%d prev_set=%u prev_runs=%llu new_set=%u "
+ "new_runs=%llu reset_mode=%d",
+ ctx->state,
+ set->id,
+ (unsigned long long)set->view->set_runs,
+ new_set->id,
+ (unsigned long long)new_set->view->set_runs,
+ reset_mode);
+
+ /*
+ * nothing more to do
+ */
+ if (new_set == set)
+ return;
+
+ is_system = ctx->flags.system;
+ state = ctx->state;
+ new_flags = new_set->flags;
+ switch_count = __get_cpu_var(pfm_stats).pfm_set_switch_count;
+
+ pfm_modview_begin(set);
+
+ new_set->view->set_runs++;
+
+ if (is_active) {
+ /*
+ * stop current set
+ */
+ if (is_system)
+ info = __get_cpu_var(pfm_syst_info);
+
+ pfm_arch_stop(current, ctx, set);
+
+ pfm_arch_save_pmds(ctx, set);
+
+ /*
+ * compute elapsed cycles for active set
+ */
+ set->duration += now_itc - set->duration_start;
+ set->view->set_status &= ~PFM_SETVFL_ACTIVE;
+
+ }
+ pfm_modview_end(set);
+
+ switch_count++;
+
+ pfm_arch_restore_pmds(ctx, new_set);
+
+ /*
+ * if masked, we must restore the pmcs such that they
+ * do not capture anything.
+ */
+ pfm_arch_restore_pmcs(ctx, new_set);
+
+ new_set->priv_flags &= ~PFM_SETFL_PRIV_MOD_BOTH;
+
+ /*
+ * reload switch threshold
+ */
+ if (new_flags & PFM_SETFL_OVFL_SWITCH)
+ pfm_reload_switch_thresholds(new_set);
+
+ /*
+ * reset timeout for new set
+ */
+ if (new_flags & PFM_SETFL_TIME_SWITCH)
+ new_set->timeout = new_set->switch_timeout;
+
+ /*
+ * reset overflowed PMD registers
+ */
+ if (reset_mode != PFM_PMD_RESET_NONE)
+ pfm_reset_pmds(ctx, new_set, reset_mode);
+
+ /*
+ * this is needed when coming from pfm_start()
+ */
+ if (no_restart)
+ goto skip_restart;
+
+ /*
+ * reactivate monitoring
+ */
+ if (is_system) {
+ info &= ~PFM_CPUINFO_TIME_SWITCH;
+
+ if (new_flags & PFM_SETFL_TIME_SWITCH)
+ info |= PFM_CPUINFO_TIME_SWITCH;
+
+ __get_cpu_var(pfm_syst_info) = info;
+
+ PFM_DBG("new_set=%u info=0x%lx flags=0x%x",
+ new_set->id,
+ info,
+ new_flags);
+
+ if (is_active && (current->pid != 0 || (new_flags & PFM_SETFL_EXCL_IDLE) == 0))
+ pfm_arch_start(current, ctx, new_set);
+ } else {
+ if (is_active)
+ pfm_arch_start(current, ctx, new_set);
+ }
+
+ if (is_active)
+ new_set->duration_start = now_itc;
+
+skip_restart:
+ end_itc = pfm_arch_get_itc();
+ ctx->active_set = new_set;
+ new_set->view->set_status |= PFM_SETVFL_ACTIVE;
+
+ __get_cpu_var(pfm_stats).pfm_set_switch_count = switch_count;
+ __get_cpu_var(pfm_stats).pfm_set_switch_cycles += end_itc - now_itc;
+}
+
+static int pfm_setfl_sane(struct pfm_context *ctx, u32 flags)
+{
+#define PFM_SETFL_BOTH_SWITCH (PFM_SETFL_OVFL_SWITCH|PFM_SETFL_TIME_SWITCH)
+ int ret;
+
+ ret = pfm_arch_setfl_sane(ctx, flags);
+ if (ret)
+ return ret;
+
+ if ((flags & PFM_SETFL_BOTH_SWITCH) == PFM_SETFL_BOTH_SWITCH) {
+ PFM_DBG("both switch ovfl and switch time are set");
+ return -EINVAL;
+ }
+
+ if ((flags & PFM_SETFL_EXCL_IDLE) != 0 && ctx->flags.system == 0) {
+ PFM_DBG("excl idle is for system wide only");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * it is never possible to change the identification of an existing set
+ */
+static int __pfm_change_evtset(struct pfm_context *ctx,
+ struct pfm_event_set *set,
+ struct pfarg_setdesc *req)
+{
+ u32 flags;
+ u16 set_id, set_id_next;
+ unsigned long ji;
+ int ret;
+
+ BUG_ON(ctx->state == PFM_CTX_LOADED);
+
+ set_id = req->set_id;
+ set_id_next = req->set_id_next;
+ flags = req->set_flags;
+
+ ret = pfm_setfl_sane(ctx, flags);
+ if (ret) {
+ PFM_DBG("invalid flags 0x%x set %u", flags, set_id);
+ return -EINVAL;
+ }
+
+ /*
+ * commit changes
+ *
+ * note that we defer checking the validity of set_id_next until the
+ * context is actually attached. This is the only moment where we can
+ * safely assess the sanity of the sets because sets cannot be changed
+ * or deleted once the context is attached
+ */
+ set->id = set_id;
+ set->id_next = set_id_next;
+ set->flags = flags;
+ set->priv_flags = 0;
+ set->sw_next = NULL;
+
+ /*
+ * XXX: what about set_priv_flags
+ */
+
+ /*
+ * reset pointer to next set
+ */
+ set->sw_next = NULL;
+
+ ji = usecs_to_jiffies(req->set_timeout);
+
+ /*
+ * verify that timeout is not 0
+ */
+ if (ji == 0 && (flags & PFM_SETFL_TIME_SWITCH) != 0) {
+ PFM_DBG("invalid timeout=0");
+ return -EINVAL;
+ }
+
+ set->switch_timeout = set->timeout = ji;
+
+ /*
+ * return actual timeout in usecs
+ */
+ req->set_timeout = jiffies_to_usecs(ji);
+
+ PFM_DBG("set %u flags=0x%x id_next=%u req_usec=%u"
+ "jiffies=%lu runs=%llu HZ=%u TICK_NSEC=%lu eff_usec=%u",
+ set_id,
+ flags,
+ set_id_next,
+ req->set_timeout,
+ ji,
+ (unsigned long long)set->view->set_runs,
+ HZ, TICK_NSEC,
+ req->set_timeout);
+
+ return 0;
+}
+
+/*
+ * this function does not modify the next field
+ */
+void pfm_init_evtset(struct pfm_event_set *set)
+{
+ u64 *impl_pmcs;
+ u16 i, max_pmc;
+
+ max_pmc = pfm_pmu_conf->max_pmc;
+ impl_pmcs = pfm_pmu_conf->impl_pmcs;
+
+ /*
+ * install default values for all PMC registers
+ */
+ for (i=0; i < max_pmc; i++) {
+ if (pfm_bv_isset(impl_pmcs, i)) {
+ set->pmcs[i] = pfm_pmu_conf->pmc_desc[i].dfl_val;
+ PFM_DBG("set%u pmc%u=0x%llx",
+ set->id,
+ i,
+ (unsigned long long)set->pmcs[i]);
+ }
+ }
+
+ /*
+ * PMD registers are set to 0 when the event set is allocated,
+ * hence we do not need to explicitely initialize them.
+ *
+ * For virtual PMD registers (i.e., those tied to a SW resource)
+ * their value becomes meaningful once the context is attached.
+ */
+}
+
+struct pfm_event_set *pfm_find_set(struct pfm_context *ctx, u16 set_id,
+ int alloc)
+{
+ kmem_cache_t *cachep;
+ struct pfm_event_set *set, *new_set, *prev;
+ unsigned long offs;
+ size_t view_size;
+ void *view;
+
+ PFM_DBG("looking for set=%u", set_id);
+
+ /*
+ * shortcut for set 0: always exist, cannot be removed
+ */
+ if (set_id == 0 && alloc == 0)
+ return list_entry(ctx->list.next, struct pfm_event_set, list);
+
+ prev = NULL;
+ list_for_each_entry(set, &ctx->list, list) {
+ if (set->id == set_id)
+ return set;
+ if (set->id > set_id)
+ break;
+ prev = set;
+ }
+
+ if (alloc == 0)
+ return NULL;
+
+ cachep = ctx->flags.mapset ? pfm_set_cachep : pfm_lg_set_cachep;
+
+ new_set = kmem_cache_alloc(cachep, SLAB_ATOMIC);
+ if (new_set) {
+ memset(new_set, 0, sizeof(*set));
+
+ if (ctx->flags.mapset) {
+ view_size = PAGE_ALIGN(sizeof(struct pfm_set_view));
+ view = vmalloc(view_size);
+ if (view == NULL) {
+ PFM_DBG("cannot allocate set view");
+ kmem_cache_free(cachep, new_set);
+ return NULL;
+ }
+ offs = PFM_SET_REMAP_BASE
+ + (set_id*PFM_SET_REMAP_SCALAR);
+ } else {
+ view_size = sizeof(struct pfm_set_view);
+ view = (struct pfm_set_view *)(new_set+1);
+ offs = 0;
+ }
+
+ memset(view, 0, sizeof(struct pfm_set_view));
+
+ new_set->id = set_id;
+ new_set->view = view;
+ new_set->mmap_offset = offs;
+
+ INIT_LIST_HEAD(&new_set->list);
+
+ if (prev == NULL) {
+ list_add(&(new_set->list), &ctx->list);
+ } else {
+ PFM_DBG("add after set=%u", prev->id);
+ list_add(&(new_set->list), &prev->list);
+ }
+ PFM_DBG("set_id=%u size=%zu view=%p remap=%d mmap_offs=%lu",
+ set_id,
+ view_size,
+ view,
+ ctx->flags.mapset,
+ new_set->mmap_offset);
+ }
+ return new_set;
+}
+
+
+/*
+ * context is unloaded for this command. Interrupts are enabled
+ */
+int __pfm_create_evtsets(struct pfm_context *ctx, struct pfarg_setdesc *req,
+ int count)
+{
+ struct pfm_event_set *set;
+ u16 set_id;
+ int i, ret;
+
+ for (i = 0; i < count; i++, req++) {
+ set_id = req->set_id;
+
+ PFM_DBG("set_id=%u", set_id);
+
+ set = pfm_find_set(ctx, set_id, 1);
+ if (set == NULL)
+ goto error_mem;
+
+ ret = __pfm_change_evtset(ctx, set, req);
+ if (ret)
+ goto error_params;
+
+ pfm_init_evtset(set);
+ }
+ return 0;
+error_mem:
+ PFM_DBG("cannot allocate set %u", set_id);
+ pfm_retflag_set(req->set_flags, PFM_REG_RETFL_EINVAL);
+ return -ENOMEM;
+error_params:
+ pfm_retflag_set(req->set_flags, PFM_REG_RETFL_EINVAL);
+ return ret;
+}
+
+int __pfm_getinfo_evtsets(struct pfm_context *ctx, struct pfarg_setinfo *req,
+ int count)
+{
+ struct pfm_event_set *set;
+ int i, is_system, is_loaded;
+ u16 set_id;
+ int max_cnt_pmd;
+ u64 end_cycles;
+
+ end_cycles = pfm_arch_get_itc();
+ is_system = ctx->flags.system;
+ is_loaded = ctx->state == PFM_CTX_LOADED;
+ max_cnt_pmd = pfm_pmu_conf->max_cnt_pmd;
+
+ for (i = 0; i < count; i++, req++) {
+
+ set_id = req->set_id;
+
+ PFM_DBG("set_id=%u", set_id);
+
+ list_for_each_entry(set, &ctx->list, list) {
+ if (set->id == set_id)
+ goto found;
+ if (set->id > set_id)
+ goto error;
+ }
+found:
+ /*
+ * compute leftover timeout
+ */
+
+ req->set_flags = set->flags;
+ req->set_timeout = jiffies_to_usecs(set->timeout);
+ req->set_runs = set->view->set_runs;
+ req->set_act_duration = set->duration;
+ req->set_mmap_offset = set->mmap_offset;
+
+ /*
+ * adjust for active set if needed
+ */
+ if (is_system && is_loaded && ctx->flags.started
+ && set == ctx->active_set)
+ req->set_act_duration += end_cycles
+ - set->duration_start;
+
+ /*
+ * copy the list of pmds which last overflowed for
+ * the set
+ */
+ bitmap_copy(ulp(req->set_ovfl_pmds),
+ ulp(set->ovfl_pmds),
+ max_cnt_pmd);
+
+ /*
+ * copy bitmask of available PMU registers
+ */
+ bitmap_copy(ulp(req->set_avail_pmcs),
+ ulp(pfm_pmu_conf->impl_pmcs),
+ pfm_pmu_conf->max_pmc);
+
+ bitmap_copy(ulp(req->set_avail_pmds),
+ ulp(pfm_pmu_conf->impl_pmds),
+ pfm_pmu_conf->max_pmd);
+
+ pfm_retflag_set(req->set_flags, 0);
+
+ PFM_DBG("set %u flags=0x%x eff_usec=%u runs=%llu",
+ set_id,
+ set->flags,
+ req->set_timeout,
+ (unsigned long long)set->view->set_runs);
+ }
+ return 0;
+error:
+ PFM_DBG("set %u not found", set_id);
+ pfm_retflag_set(req->set_flags, PFM_REG_RETFL_EINVAL);
+ return -EINVAL;
+}
+
+/*
+ * context is unloaded for this command. Interrupts are enabled
+ */
+int __pfm_delete_evtsets(struct pfm_context *ctx, void *arg, int count)
+{
+ struct pfarg_setdesc *req = arg;
+ struct pfm_event_set *set;
+ kmem_cache_t *cachep;
+ u16 set_id;
+ size_t view_size;
+ int i;
+
+ /* delete operation only works when context is detached */
+ BUG_ON(ctx->state != PFM_CTX_UNLOADED);
+
+ view_size = PAGE_ALIGN(sizeof(struct pfm_set_view));
+
+ if (ctx->flags.mapset)
+ cachep = pfm_set_cachep;
+ else
+ cachep = pfm_lg_set_cachep;
+
+ for (i = 0; i < count; i++, req++) {
+ set_id = req->set_id;
+
+ /*
+ * cannot remove set 0
+ */
+ if (set_id == 0)
+ goto error;
+
+ list_for_each_entry(set, &ctx->list, list) {
+ if (set->id == set_id)
+ goto found;
+ if (set->id > set_id)
+ goto error;
+ }
+ goto error;
+found:
+ /*
+ * clear active set if necessary.
+ * will be updated when context is loaded
+ */
+ if (set == ctx->active_set)
+ ctx->active_set = NULL;
+
+ list_del(&set->list);
+
+ vfree(set->view);
+ kmem_cache_free(cachep, set);
+
+ pfm_retflag_set(req->set_flags, 0);
+
+ PFM_DBG("deleted set_id=%u", set_id);
+ }
+ return 0;
+error:
+ PFM_DBG("set_id=%u not found or invalid", set_id);
+ pfm_retflag_set(req->set_flags, PFM_REG_RETFL_EINVAL);
+ return -EINVAL;
+}
+
+/*
+ * called from pfm_context_free() to free all sets
+ */
+void pfm_free_sets(struct pfm_context *ctx)
+{
+ struct pfm_event_set *set, *tmp;
+ kmem_cache_t *cachep;
+ int use_remap;
+
+ use_remap = ctx->flags.mapset;
+
+ if (use_remap)
+ cachep = pfm_set_cachep;
+ else
+ cachep = pfm_lg_set_cachep;
+
+ list_for_each_entry_safe(set, tmp, &ctx->list, list) {
+ list_del(&set->list);
+ if (use_remap)
+ vfree(set->view);
+ kmem_cache_free(cachep, set);
+ }
+}
+
+int pfm_sets_init(void)
+{
+
+ pfm_lg_set_cachep = kmem_cache_create("pfm_large_event_set",
+ sizeof(struct pfm_event_set)+sizeof(struct pfm_set_view),
+ SLAB_HWCACHE_ALIGN, 0, NULL, NULL);
+ if (pfm_lg_set_cachep == NULL) {
+ PFM_ERR("cannot initialize large event set slab");
+ return -ENOMEM;
+ }
+
+ pfm_set_cachep = kmem_cache_create("pfm_event_set",
+ sizeof(struct pfm_event_set),
+ SLAB_HWCACHE_ALIGN, 0, NULL, NULL);
+ if (pfm_set_cachep == NULL) {
+ PFM_ERR("cannot initialize event set slab");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static struct page *pfm_view_map_pagefault(struct vm_area_struct *vma,
+ unsigned long address, int *type)
+{
+ void *kaddr;
+ struct page *page;
+
+ kaddr = vma->vm_private_data;
+ if (kaddr == NULL) {
+ PFM_DBG("no view");
+ return NOPAGE_SIGBUS;
+ }
+
+ if ( (address < (unsigned long) vma->vm_start) ||
+ (address > (unsigned long) (vma->vm_start + PAGE_SIZE)) )
+ return NOPAGE_SIGBUS;
+
+ kaddr += (address - vma->vm_start);
+
+ if (type)
+ *type = VM_FAULT_MINOR;
+
+ page = vmalloc_to_page(kaddr);
+ get_page(page);
+
+ PFM_DBG("[%d] start=%p ref_count=%d",
+ current->pid,
+ kaddr, page_count(page));
+
+ return page;
+}
+struct vm_operations_struct pfm_view_map_vm_ops = {
+ .nopage = pfm_view_map_pagefault,
+};
+
+int pfm_mmap_set(struct pfm_context *ctx, struct vm_area_struct *vma,
+ size_t size)
+{
+ struct pfm_event_set *set;
+ u16 set_id;
+
+ if (ctx->flags.mapset == 0) {
+ PFM_DBG("context does not use set remapping");
+ return -EINVAL;
+ }
+
+ if (vma->vm_pgoff < PFM_SET_REMAP_OFFS
+ || vma->vm_pgoff >= PFM_SET_REMAP_OFFS_MAX) {
+ PFM_DBG("invalid offset %lu", vma->vm_pgoff);
+ return -EINVAL;
+ }
+
+ if (size != PAGE_SIZE) {
+ PFM_DBG("size %zu must be page size", size);
+ return -EINVAL;
+ }
+
+ set_id = (u16)(vma->vm_pgoff - PFM_SET_REMAP_OFFS);
+ set = pfm_find_set(ctx, set_id, 0);
+ if (set == NULL) {
+ PFM_DBG("set=%u is undefined", set_id);
+ return -EINVAL;
+ }
+
+ PFM_DBG("mmaping set_id=%u", set_id);
+
+ vma->vm_ops = &pfm_view_map_vm_ops;
+ vma->vm_private_data = set->view;
+
+ return 0;
+}
-
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