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SGI Altix mmtimer: allow larger number of timers per node
The purpose of this patch to the SGI Altix specific mmtimer (posix timer) driver is to allow a virtually infinite number of timers to be set per node. Timers will now be kept on a sorted per-node list and a single node-based hardware comparator is used to trigger the next timer. [akpm@linux-foundation.org: mark things static] [akpm@linux-foundation.org: fix warning] Signed-off-by: Dimitri Sivanich <sivanich@sgi.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dimitri Sivanich
Linus Torvalds
parent
d17468c73e
commit
cbacdd9572
@ -74,9 +74,8 @@ static const struct file_operations mmtimer_fops = {
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* We only have comparison registers RTC1-4 currently available per
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* node. RTC0 is used by SAL.
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*/
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#define NUM_COMPARATORS 3
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/* Check for an RTC interrupt pending */
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static int inline mmtimer_int_pending(int comparator)
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static int mmtimer_int_pending(int comparator)
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{
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if (HUB_L((unsigned long *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED)) &
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SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator)
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@ -84,15 +83,16 @@ static int inline mmtimer_int_pending(int comparator)
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else
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return 0;
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}
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/* Clear the RTC interrupt pending bit */
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static void inline mmtimer_clr_int_pending(int comparator)
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static void mmtimer_clr_int_pending(int comparator)
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{
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HUB_S((u64 *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS),
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SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator);
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}
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/* Setup timer on comparator RTC1 */
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static void inline mmtimer_setup_int_0(u64 expires)
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static void mmtimer_setup_int_0(int cpu, u64 expires)
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{
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u64 val;
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@ -106,7 +106,7 @@ static void inline mmtimer_setup_int_0(u64 expires)
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mmtimer_clr_int_pending(0);
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val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC1_INT_CONFIG_IDX_SHFT) |
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((u64)cpu_physical_id(smp_processor_id()) <<
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((u64)cpu_physical_id(cpu) <<
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SH_RTC1_INT_CONFIG_PID_SHFT);
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/* Set configuration */
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@ -122,7 +122,7 @@ static void inline mmtimer_setup_int_0(u64 expires)
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}
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/* Setup timer on comparator RTC2 */
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static void inline mmtimer_setup_int_1(u64 expires)
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static void mmtimer_setup_int_1(int cpu, u64 expires)
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{
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u64 val;
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@ -133,7 +133,7 @@ static void inline mmtimer_setup_int_1(u64 expires)
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mmtimer_clr_int_pending(1);
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val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC2_INT_CONFIG_IDX_SHFT) |
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((u64)cpu_physical_id(smp_processor_id()) <<
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((u64)cpu_physical_id(cpu) <<
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SH_RTC2_INT_CONFIG_PID_SHFT);
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HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_CONFIG), val);
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@ -144,7 +144,7 @@ static void inline mmtimer_setup_int_1(u64 expires)
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}
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/* Setup timer on comparator RTC3 */
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static void inline mmtimer_setup_int_2(u64 expires)
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static void mmtimer_setup_int_2(int cpu, u64 expires)
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{
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u64 val;
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@ -155,7 +155,7 @@ static void inline mmtimer_setup_int_2(u64 expires)
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mmtimer_clr_int_pending(2);
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val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC3_INT_CONFIG_IDX_SHFT) |
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((u64)cpu_physical_id(smp_processor_id()) <<
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((u64)cpu_physical_id(cpu) <<
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SH_RTC3_INT_CONFIG_PID_SHFT);
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HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_CONFIG), val);
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@ -170,22 +170,22 @@ static void inline mmtimer_setup_int_2(u64 expires)
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* in order to insure that the setup succeeds in a deterministic time frame.
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* It will check if the interrupt setup succeeded.
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*/
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static int inline mmtimer_setup(int comparator, unsigned long expires)
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static int mmtimer_setup(int cpu, int comparator, unsigned long expires)
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{
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switch (comparator) {
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case 0:
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mmtimer_setup_int_0(expires);
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mmtimer_setup_int_0(cpu, expires);
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break;
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case 1:
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mmtimer_setup_int_1(expires);
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mmtimer_setup_int_1(cpu, expires);
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break;
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case 2:
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mmtimer_setup_int_2(expires);
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mmtimer_setup_int_2(cpu, expires);
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break;
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}
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/* We might've missed our expiration time */
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if (rtc_time() < expires)
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if (rtc_time() <= expires)
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return 1;
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/*
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@ -195,7 +195,7 @@ static int inline mmtimer_setup(int comparator, unsigned long expires)
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return mmtimer_int_pending(comparator);
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}
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static int inline mmtimer_disable_int(long nasid, int comparator)
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static int mmtimer_disable_int(long nasid, int comparator)
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{
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switch (comparator) {
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case 0:
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@ -216,18 +216,124 @@ static int inline mmtimer_disable_int(long nasid, int comparator)
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return 0;
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}
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#define TIMER_OFF 0xbadcabLL
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#define COMPARATOR 1 /* The comparator to use */
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/* There is one of these for each comparator */
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typedef struct mmtimer {
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spinlock_t lock ____cacheline_aligned;
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#define TIMER_OFF 0xbadcabLL /* Timer is not setup */
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#define TIMER_SET 0 /* Comparator is set for this timer */
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/* There is one of these for each timer */
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struct mmtimer {
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struct rb_node list;
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struct k_itimer *timer;
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int i;
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int cpu;
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struct tasklet_struct tasklet;
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} mmtimer_t;
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};
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static mmtimer_t ** timers;
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struct mmtimer_node {
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spinlock_t lock ____cacheline_aligned;
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struct rb_root timer_head;
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struct rb_node *next;
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struct tasklet_struct tasklet;
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};
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static struct mmtimer_node *timers;
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/*
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* Add a new mmtimer struct to the node's mmtimer list.
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* This function assumes the struct mmtimer_node is locked.
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*/
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static void mmtimer_add_list(struct mmtimer *n)
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{
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int nodeid = n->timer->it.mmtimer.node;
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unsigned long expires = n->timer->it.mmtimer.expires;
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struct rb_node **link = &timers[nodeid].timer_head.rb_node;
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struct rb_node *parent = NULL;
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struct mmtimer *x;
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/*
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* Find the right place in the rbtree:
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*/
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while (*link) {
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parent = *link;
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x = rb_entry(parent, struct mmtimer, list);
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if (expires < x->timer->it.mmtimer.expires)
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link = &(*link)->rb_left;
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else
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link = &(*link)->rb_right;
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}
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/*
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* Insert the timer to the rbtree and check whether it
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* replaces the first pending timer
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*/
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rb_link_node(&n->list, parent, link);
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rb_insert_color(&n->list, &timers[nodeid].timer_head);
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if (!timers[nodeid].next || expires < rb_entry(timers[nodeid].next,
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struct mmtimer, list)->timer->it.mmtimer.expires)
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timers[nodeid].next = &n->list;
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}
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/*
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* Set the comparator for the next timer.
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* This function assumes the struct mmtimer_node is locked.
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*/
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static void mmtimer_set_next_timer(int nodeid)
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{
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struct mmtimer_node *n = &timers[nodeid];
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struct mmtimer *x;
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struct k_itimer *t;
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int o;
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restart:
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if (n->next == NULL)
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return;
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x = rb_entry(n->next, struct mmtimer, list);
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t = x->timer;
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if (!t->it.mmtimer.incr) {
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/* Not an interval timer */
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if (!mmtimer_setup(x->cpu, COMPARATOR,
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t->it.mmtimer.expires)) {
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/* Late setup, fire now */
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tasklet_schedule(&n->tasklet);
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}
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return;
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}
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/* Interval timer */
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o = 0;
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while (!mmtimer_setup(x->cpu, COMPARATOR, t->it.mmtimer.expires)) {
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unsigned long e, e1;
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struct rb_node *next;
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t->it.mmtimer.expires += t->it.mmtimer.incr << o;
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t->it_overrun += 1 << o;
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o++;
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if (o > 20) {
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printk(KERN_ALERT "mmtimer: cannot reschedule timer\n");
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t->it.mmtimer.clock = TIMER_OFF;
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n->next = rb_next(&x->list);
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rb_erase(&x->list, &n->timer_head);
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kfree(x);
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goto restart;
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}
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e = t->it.mmtimer.expires;
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next = rb_next(&x->list);
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if (next == NULL)
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continue;
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e1 = rb_entry(next, struct mmtimer, list)->
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timer->it.mmtimer.expires;
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if (e > e1) {
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n->next = next;
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rb_erase(&x->list, &n->timer_head);
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mmtimer_add_list(x);
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goto restart;
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}
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}
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}
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/**
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* mmtimer_ioctl - ioctl interface for /dev/mmtimer
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@ -390,35 +496,6 @@ static int sgi_clock_set(clockid_t clockid, struct timespec *tp)
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return 0;
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}
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/*
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* Schedule the next periodic interrupt. This function will attempt
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* to schedule a periodic interrupt later if necessary. If the scheduling
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* of an interrupt fails then the time to skip is lengthened
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* exponentially in order to ensure that the next interrupt
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* can be properly scheduled..
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*/
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static int inline reschedule_periodic_timer(mmtimer_t *x)
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{
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int n;
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struct k_itimer *t = x->timer;
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t->it.mmtimer.clock = x->i;
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t->it_overrun--;
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n = 0;
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do {
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t->it.mmtimer.expires += t->it.mmtimer.incr << n;
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t->it_overrun += 1 << n;
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n++;
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if (n > 20)
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return 1;
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} while (!mmtimer_setup(x->i, t->it.mmtimer.expires));
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return 0;
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}
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/**
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* mmtimer_interrupt - timer interrupt handler
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* @irq: irq received
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@ -435,71 +512,75 @@ static int inline reschedule_periodic_timer(mmtimer_t *x)
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static irqreturn_t
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mmtimer_interrupt(int irq, void *dev_id)
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{
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int i;
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unsigned long expires = 0;
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int result = IRQ_NONE;
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unsigned indx = cpu_to_node(smp_processor_id());
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struct mmtimer *base;
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/*
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* Do this once for each comparison register
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*/
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for (i = 0; i < NUM_COMPARATORS; i++) {
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mmtimer_t *base = timers[indx] + i;
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/* Make sure this doesn't get reused before tasklet_sched */
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spin_lock(&base->lock);
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if (base->cpu == smp_processor_id()) {
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if (base->timer)
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expires = base->timer->it.mmtimer.expires;
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/* expires test won't work with shared irqs */
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if ((mmtimer_int_pending(i) > 0) ||
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(expires && (expires < rtc_time()))) {
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mmtimer_clr_int_pending(i);
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tasklet_schedule(&base->tasklet);
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result = IRQ_HANDLED;
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}
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}
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spin_unlock(&base->lock);
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expires = 0;
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spin_lock(&timers[indx].lock);
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base = rb_entry(timers[indx].next, struct mmtimer, list);
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if (base == NULL) {
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spin_unlock(&timers[indx].lock);
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return result;
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}
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if (base->cpu == smp_processor_id()) {
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if (base->timer)
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expires = base->timer->it.mmtimer.expires;
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/* expires test won't work with shared irqs */
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if ((mmtimer_int_pending(COMPARATOR) > 0) ||
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(expires && (expires <= rtc_time()))) {
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mmtimer_clr_int_pending(COMPARATOR);
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tasklet_schedule(&timers[indx].tasklet);
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result = IRQ_HANDLED;
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}
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}
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spin_unlock(&timers[indx].lock);
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return result;
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}
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void mmtimer_tasklet(unsigned long data) {
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mmtimer_t *x = (mmtimer_t *)data;
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struct k_itimer *t = x->timer;
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static void mmtimer_tasklet(unsigned long data)
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{
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int nodeid = data;
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struct mmtimer_node *mn = &timers[nodeid];
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struct mmtimer *x = rb_entry(mn->next, struct mmtimer, list);
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struct k_itimer *t;
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unsigned long flags;
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if (t == NULL)
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return;
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/* Send signal and deal with periodic signals */
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spin_lock_irqsave(&t->it_lock, flags);
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spin_lock(&x->lock);
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/* If timer was deleted between interrupt and here, leave */
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if (t != x->timer)
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spin_lock_irqsave(&mn->lock, flags);
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if (!mn->next)
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goto out;
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x = rb_entry(mn->next, struct mmtimer, list);
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t = x->timer;
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if (t->it.mmtimer.clock == TIMER_OFF)
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goto out;
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t->it_overrun = 0;
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if (posix_timer_event(t, 0) != 0) {
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// printk(KERN_WARNING "mmtimer: cannot deliver signal.\n");
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mn->next = rb_next(&x->list);
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rb_erase(&x->list, &mn->timer_head);
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if (posix_timer_event(t, 0) != 0)
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t->it_overrun++;
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}
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if(t->it.mmtimer.incr) {
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/* Periodic timer */
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if (reschedule_periodic_timer(x)) {
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printk(KERN_WARNING "mmtimer: unable to reschedule\n");
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x->timer = NULL;
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}
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t->it.mmtimer.expires += t->it.mmtimer.incr;
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mmtimer_add_list(x);
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} else {
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/* Ensure we don't false trigger in mmtimer_interrupt */
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t->it.mmtimer.clock = TIMER_OFF;
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t->it.mmtimer.expires = 0;
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kfree(x);
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}
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/* Set comparator for next timer, if there is one */
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mmtimer_set_next_timer(nodeid);
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t->it_overrun_last = t->it_overrun;
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out:
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spin_unlock(&x->lock);
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spin_unlock_irqrestore(&t->it_lock, flags);
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spin_unlock_irqrestore(&mn->lock, flags);
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}
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static int sgi_timer_create(struct k_itimer *timer)
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@ -516,19 +597,50 @@ static int sgi_timer_create(struct k_itimer *timer)
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*/
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static int sgi_timer_del(struct k_itimer *timr)
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{
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int i = timr->it.mmtimer.clock;
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cnodeid_t nodeid = timr->it.mmtimer.node;
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mmtimer_t *t = timers[nodeid] + i;
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unsigned long irqflags;
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if (i != TIMER_OFF) {
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spin_lock_irqsave(&t->lock, irqflags);
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mmtimer_disable_int(cnodeid_to_nasid(nodeid),i);
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t->timer = NULL;
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spin_lock_irqsave(&timers[nodeid].lock, irqflags);
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if (timr->it.mmtimer.clock != TIMER_OFF) {
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unsigned long expires = timr->it.mmtimer.expires;
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struct rb_node *n = timers[nodeid].timer_head.rb_node;
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struct mmtimer *uninitialized_var(t);
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int r = 0;
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timr->it.mmtimer.clock = TIMER_OFF;
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timr->it.mmtimer.expires = 0;
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spin_unlock_irqrestore(&t->lock, irqflags);
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while (n) {
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t = rb_entry(n, struct mmtimer, list);
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if (t->timer == timr)
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break;
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if (expires < t->timer->it.mmtimer.expires)
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n = n->rb_left;
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else
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n = n->rb_right;
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}
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if (!n) {
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spin_unlock_irqrestore(&timers[nodeid].lock, irqflags);
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return 0;
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}
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if (timers[nodeid].next == n) {
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timers[nodeid].next = rb_next(n);
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r = 1;
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}
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rb_erase(n, &timers[nodeid].timer_head);
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kfree(t);
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if (r) {
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mmtimer_disable_int(cnodeid_to_nasid(nodeid),
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COMPARATOR);
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mmtimer_set_next_timer(nodeid);
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}
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}
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spin_unlock_irqrestore(&timers[nodeid].lock, irqflags);
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return 0;
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}
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@ -557,12 +669,11 @@ static int sgi_timer_set(struct k_itimer *timr, int flags,
|
||||
struct itimerspec * new_setting,
|
||||
struct itimerspec * old_setting)
|
||||
{
|
||||
|
||||
int i;
|
||||
unsigned long when, period, irqflags;
|
||||
int err = 0;
|
||||
cnodeid_t nodeid;
|
||||
mmtimer_t *base;
|
||||
struct mmtimer *base;
|
||||
struct rb_node *n;
|
||||
|
||||
if (old_setting)
|
||||
sgi_timer_get(timr, old_setting);
|
||||
@ -575,6 +686,10 @@ static int sgi_timer_set(struct k_itimer *timr, int flags,
|
||||
/* Clear timer */
|
||||
return 0;
|
||||
|
||||
base = kmalloc(sizeof(struct mmtimer), GFP_KERNEL);
|
||||
if (base == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
if (flags & TIMER_ABSTIME) {
|
||||
struct timespec n;
|
||||
unsigned long now;
|
||||
@ -604,47 +719,38 @@ static int sgi_timer_set(struct k_itimer *timr, int flags,
|
||||
preempt_disable();
|
||||
|
||||
nodeid = cpu_to_node(smp_processor_id());
|
||||
retry:
|
||||
/* Don't use an allocated timer, or a deleted one that's pending */
|
||||
for(i = 0; i< NUM_COMPARATORS; i++) {
|
||||
base = timers[nodeid] + i;
|
||||
if (!base->timer && !base->tasklet.state) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (i == NUM_COMPARATORS) {
|
||||
preempt_enable();
|
||||
return -EBUSY;
|
||||
}
|
||||
/* Lock the node timer structure */
|
||||
spin_lock_irqsave(&timers[nodeid].lock, irqflags);
|
||||
|
||||
spin_lock_irqsave(&base->lock, irqflags);
|
||||
|
||||
if (base->timer || base->tasklet.state != 0) {
|
||||
spin_unlock_irqrestore(&base->lock, irqflags);
|
||||
goto retry;
|
||||
}
|
||||
base->timer = timr;
|
||||
base->cpu = smp_processor_id();
|
||||
|
||||
timr->it.mmtimer.clock = i;
|
||||
timr->it.mmtimer.clock = TIMER_SET;
|
||||
timr->it.mmtimer.node = nodeid;
|
||||
timr->it.mmtimer.incr = period;
|
||||
timr->it.mmtimer.expires = when;
|
||||
|
||||
if (period == 0) {
|
||||
if (!mmtimer_setup(i, when)) {
|
||||
mmtimer_disable_int(-1, i);
|
||||
posix_timer_event(timr, 0);
|
||||
timr->it.mmtimer.expires = 0;
|
||||
}
|
||||
} else {
|
||||
timr->it.mmtimer.expires -= period;
|
||||
if (reschedule_periodic_timer(base))
|
||||
err = -EINVAL;
|
||||
n = timers[nodeid].next;
|
||||
|
||||
/* Add the new struct mmtimer to node's timer list */
|
||||
mmtimer_add_list(base);
|
||||
|
||||
if (timers[nodeid].next == n) {
|
||||
/* No need to reprogram comparator for now */
|
||||
spin_unlock_irqrestore(&timers[nodeid].lock, irqflags);
|
||||
preempt_enable();
|
||||
return err;
|
||||
}
|
||||
|
||||
spin_unlock_irqrestore(&base->lock, irqflags);
|
||||
/* We need to reprogram the comparator */
|
||||
if (n)
|
||||
mmtimer_disable_int(cnodeid_to_nasid(nodeid), COMPARATOR);
|
||||
|
||||
mmtimer_set_next_timer(nodeid);
|
||||
|
||||
/* Unlock the node timer structure */
|
||||
spin_unlock_irqrestore(&timers[nodeid].lock, irqflags);
|
||||
|
||||
preempt_enable();
|
||||
|
||||
@ -669,7 +775,6 @@ static struct k_clock sgi_clock = {
|
||||
*/
|
||||
static int __init mmtimer_init(void)
|
||||
{
|
||||
unsigned i;
|
||||
cnodeid_t node, maxn = -1;
|
||||
|
||||
if (!ia64_platform_is("sn2"))
|
||||
@ -706,31 +811,18 @@ static int __init mmtimer_init(void)
|
||||
maxn++;
|
||||
|
||||
/* Allocate list of node ptrs to mmtimer_t's */
|
||||
timers = kzalloc(sizeof(mmtimer_t *)*maxn, GFP_KERNEL);
|
||||
timers = kzalloc(sizeof(struct mmtimer_node)*maxn, GFP_KERNEL);
|
||||
if (timers == NULL) {
|
||||
printk(KERN_ERR "%s: failed to allocate memory for device\n",
|
||||
MMTIMER_NAME);
|
||||
goto out3;
|
||||
}
|
||||
|
||||
/* Allocate mmtimer_t's for each online node */
|
||||
/* Initialize struct mmtimer's for each online node */
|
||||
for_each_online_node(node) {
|
||||
timers[node] = kmalloc_node(sizeof(mmtimer_t)*NUM_COMPARATORS, GFP_KERNEL, node);
|
||||
if (timers[node] == NULL) {
|
||||
printk(KERN_ERR "%s: failed to allocate memory for device\n",
|
||||
MMTIMER_NAME);
|
||||
goto out4;
|
||||
}
|
||||
for (i=0; i< NUM_COMPARATORS; i++) {
|
||||
mmtimer_t * base = timers[node] + i;
|
||||
|
||||
spin_lock_init(&base->lock);
|
||||
base->timer = NULL;
|
||||
base->cpu = 0;
|
||||
base->i = i;
|
||||
tasklet_init(&base->tasklet, mmtimer_tasklet,
|
||||
(unsigned long) (base));
|
||||
}
|
||||
spin_lock_init(&timers[node].lock);
|
||||
tasklet_init(&timers[node].tasklet, mmtimer_tasklet,
|
||||
(unsigned long) node);
|
||||
}
|
||||
|
||||
sgi_clock_period = sgi_clock.res = NSEC_PER_SEC / sn_rtc_cycles_per_second;
|
||||
@ -741,11 +833,8 @@ static int __init mmtimer_init(void)
|
||||
|
||||
return 0;
|
||||
|
||||
out4:
|
||||
for_each_online_node(node) {
|
||||
kfree(timers[node]);
|
||||
}
|
||||
out3:
|
||||
kfree(timers);
|
||||
misc_deregister(&mmtimer_miscdev);
|
||||
out2:
|
||||
free_irq(SGI_MMTIMER_VECTOR, NULL);
|
||||
@ -754,4 +843,3 @@ out1:
|
||||
}
|
||||
|
||||
module_init(mmtimer_init);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user