/*
- * Copyright (c) 2010 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2010-2018 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <mach/mach_types.h>
#include <os/overflow.h>
+#include <vm/pmap.h>
+
/*
* Ledger entry flags. Bits in second nibble (masked by 0xF0) are used for
* ledger actions (LEDGER_ACTION_BLOCK, etc).
volatile uint32_t lt_inuse;
lck_mtx_t lt_lock;
zone_t lt_zone;
+ bool lt_initialized;
struct entry_template *lt_entries;
};
splx(s); \
}
-/*
- * Use NTOCKS "tocks" to track the rolling maximum balance of a ledger entry.
- */
-#define NTOCKS 1
-/*
- * The explicit alignment is to ensure that atomic operations don't panic
- * on ARM.
- */
-struct ledger_entry {
- volatile uint32_t le_flags;
- ledger_amount_t le_limit;
- ledger_amount_t le_warn_level;
- volatile ledger_amount_t le_credit __attribute__((aligned(8)));
- volatile ledger_amount_t le_debit __attribute__((aligned(8)));
- union {
- struct {
- /*
- * XXX - the following two fields can go away if we move all of
- * the refill logic into process policy
- */
- uint64_t le_refill_period;
- uint64_t le_last_refill;
- } le_refill;
- struct _le_maxtracking {
- struct _le_peak {
- uint32_t le_max; /* Lower 32-bits of observed max balance */
- uint32_t le_time; /* time when this peak was observed */
- } le_peaks[NTOCKS];
- ledger_amount_t le_lifetime_max; /* greatest peak ever observed */
- } le_maxtracking;
- } _le;
-} __attribute__((aligned(8)));
-
-struct ledger {
- uint64_t l_id;
- int32_t l_refs;
- int32_t l_size;
- struct ledger_template *l_template;
- struct ledger_entry l_entries[0] __attribute__((aligned(8)));
-};
-
static int ledger_cnt = 0;
/* ledger ast helper functions */
static uint32_t ledger_check_needblock(ledger_t l, uint64_t now);
template->lt_zone = zinit(ledger_size, CONFIG_TASK_MAX * ledger_size,
ledger_size,
template->lt_name);
+ template->lt_initialized = true;
+}
+
+/*
+ * Like ledger_template_complete, except we'll ask
+ * the pmap layer to manage allocations for us.
+ * Meant for ledgers that should be owned by the
+ * pmap layer.
+ */
+void
+ledger_template_complete_secure_alloc(ledger_template_t template)
+{
+ size_t ledger_size;
+ ledger_size = sizeof(struct ledger) + (template->lt_cnt * sizeof(struct ledger_entry));
+ pmap_ledger_alloc_init(ledger_size);
+ template->lt_initialized = true;
}
/*
template_lock(template);
template->lt_refs++;
cnt = template->lt_cnt;
- assert(template->lt_zone);
template_unlock(template);
- ledger = (ledger_t)zalloc(template->lt_zone);
+ if (template->lt_zone) {
+ ledger = (ledger_t)zalloc(template->lt_zone);
+ } else {
+ ledger = pmap_ledger_alloc();
+ }
+
if (ledger == NULL) {
ledger_template_dereference(template);
return LEDGER_NULL;
/* Just released the last reference. Free it. */
if (v == 1) {
- zfree(ledger->l_template->lt_zone, ledger);
+ if (ledger->l_template->lt_zone) {
+ zfree(ledger->l_template->lt_zone, ledger);
+ } else {
+ pmap_ledger_free(ledger);
+ }
}
return (KERN_SUCCESS);
ledger_limit_entry_wakeup(le);
}
-/*
- * In tenths of a second, the length of one lookback period (a "tock") for
- * ledger rolling maximum calculations. The effective lookback window will be this times
- * NTOCKS.
- *
- * Use a tock length of 2.5 seconds to get a total lookback period of 5 seconds.
- *
- * XXX Could make this caller-definable, at the point that rolling max tracking
- * is enabled for the entry.
- */
-#define TOCKLEN 25
-
-/*
- * How many sched_tick's are there in one tock (one of our lookback periods)?
- *
- * X sched_ticks 2.5 sec N sched_ticks
- * --------------- = ---------- * -------------
- * tock tock sec
- *
- * where N sched_ticks/sec is calculated via 1 << SCHED_TICK_SHIFT (see sched_prim.h)
- *
- * This should give us 20 sched_tick's in one 2.5 second-long tock.
- */
-#define SCHED_TICKS_PER_TOCK ((TOCKLEN * (1 << SCHED_TICK_SHIFT)) / 10)
-
-/*
- * Rolling max timestamps use their own unit (let's call this a "tock"). One tock is the
- * length of one lookback period that we use for our rolling max calculation.
- *
- * Calculate the current time in tocks from sched_tick (which runs at a some
- * fixed rate).
- */
-#define CURRENT_TOCKSTAMP() (sched_tick / SCHED_TICKS_PER_TOCK)
-
-/*
- * Does the given tockstamp fall in either the current or the previous tocks?
- */
-#define TOCKSTAMP_IS_STALE(now, tock) ((((now) - (tock)) < NTOCKS) ? FALSE : TRUE)
-
void
ledger_entry_check_new_balance(thread_t thread, ledger_t ledger,
int entry, struct ledger_entry *le)
{
- ledger_amount_t credit, debit;
-
if (le->le_flags & LF_TRACKING_MAX) {
ledger_amount_t balance = le->le_credit - le->le_debit;
- uint32_t now = CURRENT_TOCKSTAMP();
- struct _le_peak *p = &le->_le.le_maxtracking.le_peaks[now % NTOCKS];
- if (!TOCKSTAMP_IS_STALE(now, p->le_time) || (balance > p->le_max)) {
- /*
- * The current balance is greater than the previously
- * observed peak for the current time block, *or* we
- * haven't yet recorded a peak for the current time block --
- * so this is our new peak.
- *
- * (We only track the lower 32-bits of a balance for rolling
- * max purposes.)
- */
- p->le_max = (uint32_t)balance;
- p->le_time = now;
+ if (balance > le->_le._le_max.le_lifetime_max){
+ le->_le._le_max.le_lifetime_max = balance;
}
- struct _le_maxtracking *m = &le->_le.le_maxtracking;
- if(balance > m->le_lifetime_max){
- m->le_lifetime_max = balance;
+#if CONFIG_LEDGER_INTERVAL_MAX
+ if (balance > le->_le._le_max.le_interval_max) {
+ le->_le._le_max.le_interval_max = balance;
}
+#endif /* LEDGER_CONFIG_INTERVAL_MAX */
}
/* Check to see whether we're due a refill */
}
}
- credit = le->le_credit;
- debit = le->le_debit;
if ((le->le_flags & LF_PANIC_ON_NEGATIVE) &&
- ((credit < debit) ||
- (le->le_credit < le->le_debit))) {
- panic("ledger_entry_check_new_balance(%p,%d): negative ledger %p credit:%lld/%lld debit:%lld/%lld balance:%lld/%lld\n",
+ (le->le_credit < le->le_debit)) {
+ panic("ledger_entry_check_new_balance(%p,%d): negative ledger %p credit:%lld debit:%lld balance:%lld\n",
ledger, entry, le,
- credit, le->le_credit,
- debit, le->le_debit,
- credit - debit, le->le_credit - le->le_debit);
+ le->le_credit,
+ le->le_debit,
+ le->le_credit - le->le_debit);
}
}
new = old + amount;
lprintf(("%p Credit %lld->%lld\n", thread, old, new));
- ledger_entry_check_new_balance(thread, ledger, entry, le);
+ if (thread) {
+ ledger_entry_check_new_balance(thread, ledger, entry, le);
+ }
return (KERN_SUCCESS);
}
return ledger_credit_thread(current_thread(), ledger, entry, amount);
}
+/*
+ * Add value to an entry in a ledger; do not check balance after update.
+ */
+kern_return_t
+ledger_credit_nocheck(ledger_t ledger, int entry, ledger_amount_t amount)
+{
+ return ledger_credit_thread(NULL, ledger, entry, amount);
+}
+
/* Add all of one ledger's values into another.
* They must have been created from the same template.
* This is not done atomically. Another thread (if not otherwise synchronized)
return (KERN_SUCCESS);
}
+#if CONFIG_LEDGER_INTERVAL_MAX
kern_return_t
-ledger_get_recent_max(ledger_t ledger, int entry,
- ledger_amount_t *max_observed_balance)
+ledger_get_interval_max(ledger_t ledger, int entry,
+ ledger_amount_t *max_interval_balance, int reset)
{
- struct ledger_entry *le;
- uint32_t now = CURRENT_TOCKSTAMP();
- int i;
-
+ struct ledger_entry *le;
le = &ledger->l_entries[entry];
if (!ENTRY_VALID(ledger, entry) || !(le->le_flags & LF_TRACKING_MAX)) {
return (KERN_INVALID_VALUE);
}
- /*
- * Start with the current balance; if neither of the recorded peaks are
- * within recent history, we use this.
- */
- *max_observed_balance = le->le_credit - le->le_debit;
-
- for (i = 0; i < NTOCKS; i++) {
- if (!TOCKSTAMP_IS_STALE(now, le->_le.le_maxtracking.le_peaks[i].le_time) &&
- (le->_le.le_maxtracking.le_peaks[i].le_max > *max_observed_balance)) {
- /*
- * The peak for this time block isn't stale, and it
- * is greater than the current balance -- so use it.
- */
- *max_observed_balance = le->_le.le_maxtracking.le_peaks[i].le_max;
- }
- }
+ *max_interval_balance = le->_le._le_max.le_interval_max;
+ lprintf(("ledger_get_interval_max: %lld%s\n", *max_interval_balance,
+ (reset) ? " --> 0" : ""));
- lprintf(("ledger_get_maximum: %lld\n", *max_observed_balance));
+ if (reset) {
+ le->_le._le_max.le_interval_max = 0;
+ }
return (KERN_SUCCESS);
}
+#endif /* CONFIG_LEDGER_INTERVAL_MAX */
kern_return_t
ledger_get_lifetime_max(ledger_t ledger, int entry,
return (KERN_INVALID_VALUE);
}
- *max_lifetime_balance = le->_le.le_maxtracking.le_lifetime_max;
+ *max_lifetime_balance = le->_le._le_max.le_lifetime_max;
lprintf(("ledger_get_lifetime_max: %lld\n", *max_lifetime_balance));
return (KERN_SUCCESS);
}
lprintf(("%p Debit %lld->%lld\n", thread, old, new));
- ledger_entry_check_new_balance(thread, ledger, entry, le);
+ if (thread) {
+ ledger_entry_check_new_balance(thread, ledger, entry, le);
+ }
return (KERN_SUCCESS);
}
return ledger_debit_thread(current_thread(), ledger, entry, amount);
}
+kern_return_t
+ledger_debit_nocheck(ledger_t ledger, int entry, ledger_amount_t amount)
+{
+ return ledger_debit_thread(NULL, ledger, entry, amount);
+}
+
void
ledger_ast(thread_t thread)
{
assert(!(le->le_flags & LF_TRACKING_MAX));
/* Prepare to sleep until the resource is refilled */
- ret = assert_wait_deadline(le, TRUE,
+ ret = assert_wait_deadline(le, THREAD_INTERRUPTIBLE,
le->_le.le_refill.le_last_refill + le->_le.le_refill.le_refill_period);
if (ret != THREAD_WAITING)
return(KERN_SUCCESS);
return (KERN_SUCCESS);
}
+kern_return_t
+ledger_get_panic_on_negative(ledger_t ledger, int entry, int *panic_on_negative)
+{
+ struct ledger_entry *le;
+
+ if (!ENTRY_VALID(ledger, entry))
+ return (KERN_INVALID_ARGUMENT);
+
+ le = &ledger->l_entries[entry];
+
+ if (le->le_flags & LF_PANIC_ON_NEGATIVE) {
+ *panic_on_negative = TRUE;
+ } else {
+ *panic_on_negative = FALSE;
+ }
+
+ return (KERN_SUCCESS);
+}
+
kern_return_t
ledger_get_balance(ledger_t ledger, int entry, ledger_amount_t *balance)
{
projects / apple / xnu.git / blobdiff