[PATCH 2.6.21-rc1 1/5] ehca: reworked irq handler to avoid/reduce missed irq events
Hoang-Nam Nguyen
hnguyen at linux.vnet.ibm.com
Fri Feb 16 03:06:33 EST 2007
reworked irq handler to avoid/reduce missed irq events
Signed-off-by: Hoang-Nam Nguyen <hnguyen at de.ibm.com>
---
ehca_classes.h | 18 +++-
ehca_eq.c | 1
ehca_irq.c | 214 +++++++++++++++++++++++++++++++++++----------------------
ehca_irq.h | 1
ehca_main.c | 28 +++++--
ipz_pt_fn.h | 11 ++
6 files changed, 182 insertions(+), 91 deletions(-)
diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h
index cf95ee4..f08ad6f 100644
--- a/drivers/infiniband/hw/ehca/ehca_classes.h
+++ b/drivers/infiniband/hw/ehca/ehca_classes.h
@@ -42,8 +42,6 @@
#ifndef __EHCA_CLASSES_H__
#define __EHCA_CLASSES_H__
-#include "ehca_classes.h"
-#include "ipz_pt_fn.h"
struct ehca_module;
struct ehca_qp;
@@ -54,14 +52,22 @@ struct ehca_mw;
struct ehca_pd;
struct ehca_av;
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_user_verbs.h>
+
#ifdef CONFIG_PPC64
#include "ehca_classes_pSeries.h"
#endif
+#include "ipz_pt_fn.h"
+#include "ehca_qes.h"
+#include "ehca_irq.h"
-#include <rdma/ib_verbs.h>
-#include <rdma/ib_user_verbs.h>
+#define EHCA_EQE_CACHE_SIZE 20
-#include "ehca_irq.h"
+struct ehca_eqe_cache_entry {
+ struct ehca_eqe *eqe;
+ struct ehca_cq *cq;
+};
struct ehca_eq {
u32 length;
@@ -74,6 +80,8 @@ struct ehca_eq {
spinlock_t spinlock;
struct tasklet_struct interrupt_task;
u32 ist;
+ spinlock_t irq_spinlock;
+ struct ehca_eqe_cache_entry eqe_cache[EHCA_EQE_CACHE_SIZE];
};
struct ehca_sport {
diff --git a/drivers/infiniband/hw/ehca/ehca_eq.c b/drivers/infiniband/hw/ehca/ehca_eq.c
index 5281dec..33c822e 100644
--- a/drivers/infiniband/hw/ehca/ehca_eq.c
+++ b/drivers/infiniband/hw/ehca/ehca_eq.c
@@ -61,6 +61,7 @@ int ehca_create_eq(struct ehca_shca *shc
struct ib_device *ib_dev = &shca->ib_device;
spin_lock_init(&eq->spinlock);
+ spin_lock_init(&eq->irq_spinlock);
eq->is_initialized = 0;
if (type != EHCA_EQ && type != EHCA_NEQ) {
diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
index 6c4f9f9..b923b5d 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.c
+++ b/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -206,7 +206,7 @@ static void qp_event_callback(struct ehc
}
static void cq_event_callback(struct ehca_shca *shca,
- u64 eqe)
+ u64 eqe)
{
struct ehca_cq *cq;
unsigned long flags;
@@ -318,7 +318,7 @@ static void parse_ec(struct ehca_shca *s
"disruptive port %x configuration change", port);
ehca_info(&shca->ib_device,
- "port %x is inactive.", port);
+ "port %x is inactive.", port);
event.device = &shca->ib_device;
event.event = IB_EVENT_PORT_ERR;
event.element.port_num = port;
@@ -326,7 +326,7 @@ static void parse_ec(struct ehca_shca *s
ib_dispatch_event(&event);
ehca_info(&shca->ib_device,
- "port %x is active.", port);
+ "port %x is active.", port);
event.device = &shca->ib_device;
event.event = IB_EVENT_PORT_ACTIVE;
event.element.port_num = port;
@@ -401,87 +401,143 @@ irqreturn_t ehca_interrupt_eq(int irq, v
return IRQ_HANDLED;
}
-void ehca_tasklet_eq(unsigned long data)
-{
- struct ehca_shca *shca = (struct ehca_shca*)data;
- struct ehca_eqe *eqe;
- int int_state;
- int query_cnt = 0;
- do {
- eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
+static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe)
+{
+ u64 eqe_value;
+ u32 token;
+ unsigned long flags;
+ struct ehca_cq *cq;
+ eqe_value = eqe->entry;
+ ehca_dbg(&shca->ib_device, "eqe_value=%lx", eqe_value);
+ if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
+ ehca_dbg(&shca->ib_device, "... completion event");
+ token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
+ spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+ cq = idr_find(&ehca_cq_idr, token);
+ if (cq == NULL) {
+ spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+ ehca_err(&shca->ib_device,
+ "Invalid eqe for non-existing cq token=%x",
+ token);
+ return;
+ }
+ reset_eq_pending(cq);
+#ifdef CONFIG_INFINIBAND_EHCA_SCALING
+ queue_comp_task(cq);
+ spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+#else
+ spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+ comp_event_callback(cq);
+#endif
+ } else {
+ ehca_dbg(&shca->ib_device,
+ "Got non completion event");
+ parse_identifier(shca, eqe_value);
+ }
+}
- if ((shca->hw_level >= 2) && eqe)
- int_state = 1;
- else
- int_state = 0;
+void ehca_process_eq(struct ehca_shca *shca, int is_irq)
+{
+ struct ehca_eq *eq = &shca->eq;
+ struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache;
+ u64 eqe_value;
+ unsigned long flags;
+ int eqe_cnt, i;
+ int eq_empty = 0;
- while ((int_state == 1) || eqe) {
- while (eqe) {
- u64 eqe_value = eqe->entry;
-
- ehca_dbg(&shca->ib_device,
- "eqe_value=%lx", eqe_value);
-
- /* TODO: better structure */
- if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT,
- eqe_value)) {
- unsigned long flags;
- u32 token;
- struct ehca_cq *cq;
-
- ehca_dbg(&shca->ib_device,
- "... completion event");
- token =
- EHCA_BMASK_GET(EQE_CQ_TOKEN,
- eqe_value);
- spin_lock_irqsave(&ehca_cq_idr_lock,
- flags);
- cq = idr_find(&ehca_cq_idr, token);
-
- if (cq == NULL) {
- spin_unlock_irqrestore(&ehca_cq_idr_lock,
- flags);
- break;
- }
+ spin_lock_irqsave(&eq->irq_spinlock, flags);
+ if (is_irq) {
+ const int max_query_cnt = 100;
+ int query_cnt = 0;
+ int int_state = 1;
+ do {
+ int_state = hipz_h_query_int_state(
+ shca->ipz_hca_handle, eq->ist);
+ query_cnt++;
+ iosync();
+ } while (int_state && query_cnt < max_query_cnt);
+ if (unlikely((query_cnt == max_query_cnt)))
+ ehca_dbg(&shca->ib_device, "int_state=%x query_cnt=%x",
+ int_state, query_cnt);
+ }
- reset_eq_pending(cq);
+ /* read out all eqes */
+ eqe_cnt = 0;
+ do {
+ u32 token;
+ eqe_cache[eqe_cnt].eqe =
+ (struct ehca_eqe *)ehca_poll_eq(shca, eq);
+ if (!eqe_cache[eqe_cnt].eqe)
+ break;
+ eqe_value = eqe_cache[eqe_cnt].eqe->entry;
+ if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
+ token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
+ spin_lock(&ehca_cq_idr_lock);
+ eqe_cache[eqe_cnt].cq = idr_find(&ehca_cq_idr, token);
+ if (!eqe_cache[eqe_cnt].cq) {
+ spin_unlock(&ehca_cq_idr_lock);
+ ehca_err(&shca->ib_device,
+ "Invalid eqe for non-existing cq "
+ "token=%x", token);
+ continue;
+ }
+ spin_unlock(&ehca_cq_idr_lock);
+ } else
+ eqe_cache[eqe_cnt].cq = NULL;
+ eqe_cnt++;
+ } while (eqe_cnt < EHCA_EQE_CACHE_SIZE);
+ if (!eqe_cnt) {
+ if (is_irq)
+ ehca_dbg(&shca->ib_device,
+ "No eqe found for irq event");
+ goto unlock_irq_spinlock;
+ } else if (!is_irq)
+ ehca_dbg(&shca->ib_device, "deadman found %x eqe", eqe_cnt);
+ if (unlikely(eqe_cnt == EHCA_EQE_CACHE_SIZE))
+ ehca_dbg(&shca->ib_device, "too many eqes for one irq event");
+ /* enable irq for new packets */
+ for (i = 0; i < eqe_cnt; i++) {
+ if (eq->eqe_cache[i].cq)
+ reset_eq_pending(eq->eqe_cache[i].cq);
+ }
+ /* check eq */
+ spin_lock(&eq->spinlock);
+ eq_empty = (!ipz_eqit_eq_peek_valid(&shca->eq.ipz_queue));
+ spin_unlock(&eq->spinlock);
+ /* call completion handler for cached eqes */
+ for (i = 0; i < eqe_cnt; i++)
+ if (eq->eqe_cache[i].cq) {
#ifdef CONFIG_INFINIBAND_EHCA_SCALING
- queue_comp_task(cq);
- spin_unlock_irqrestore(&ehca_cq_idr_lock,
- flags);
+ spin_lock(&ehca_cq_idr_lock);
+ queue_comp_task(eq->eqe_cache[i].cq);
+ spin_unlock(&ehca_cq_idr_lock);
#else
- spin_unlock_irqrestore(&ehca_cq_idr_lock,
- flags);
- comp_event_callback(cq);
+ comp_event_callback(eq->eqe_cache[i].cq);
#endif
- } else {
- ehca_dbg(&shca->ib_device,
- "... non completion event");
- parse_identifier(shca, eqe_value);
- }
- eqe =
- (struct ehca_eqe *)ehca_poll_eq(shca,
- &shca->eq);
- }
-
- if (shca->hw_level >= 2) {
- int_state =
- hipz_h_query_int_state(shca->ipz_hca_handle,
- shca->eq.ist);
- query_cnt++;
- iosync();
- if (query_cnt >= 100) {
- query_cnt = 0;
- int_state = 0;
- }
- }
- eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
-
+ } else {
+ ehca_dbg(&shca->ib_device, "Got non completion event");
+ parse_identifier(shca, eq->eqe_cache[i].eqe->entry);
}
- } while (int_state != 0);
+ /* poll eq if not empty */
+ if (eq_empty)
+ goto unlock_irq_spinlock;
+ do {
+ struct ehca_eqe *eqe;
+ eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
+ if (!eqe)
+ break;
+ process_eqe(shca, eqe);
+ eqe_cnt++;
+ } while (1);
- return;
+unlock_irq_spinlock:
+ spin_unlock_irqrestore(&eq->irq_spinlock, flags);
+}
+
+void ehca_tasklet_eq(unsigned long data)
+{
+ ehca_process_eq((struct ehca_shca*)data, 1);
}
#ifdef CONFIG_INFINIBAND_EHCA_SCALING
@@ -654,11 +710,11 @@ static void take_over_work(struct ehca_c
list_splice_init(&cct->cq_list, &list);
while(!list_empty(&list)) {
- cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
+ cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
- list_del(&cq->entry);
- __queue_comp_task(cq, per_cpu_ptr(pool->cpu_comp_tasks,
- smp_processor_id()));
+ list_del(&cq->entry);
+ __queue_comp_task(cq, per_cpu_ptr(pool->cpu_comp_tasks,
+ smp_processor_id()));
}
spin_unlock_irqrestore(&cct->task_lock, flags_cct);
diff --git a/drivers/infiniband/hw/ehca/ehca_irq.h b/drivers/infiniband/hw/ehca/ehca_irq.h
index be579cc..6ed06ee 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.h
+++ b/drivers/infiniband/hw/ehca/ehca_irq.h
@@ -56,6 +56,7 @@ void ehca_tasklet_neq(unsigned long data
irqreturn_t ehca_interrupt_eq(int irq, void *dev_id);
void ehca_tasklet_eq(unsigned long data);
+void ehca_process_eq(struct ehca_shca *shca, int is_irq);
struct ehca_cpu_comp_task {
wait_queue_head_t wait_queue;
diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 1155bcf..5790534 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -52,7 +52,7 @@
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Christoph Raisch <raisch at de.ibm.com>");
MODULE_DESCRIPTION("IBM eServer HCA InfiniBand Device Driver");
-MODULE_VERSION("SVNEHCA_0020");
+MODULE_VERSION("SVNEHCA_0021");
int ehca_open_aqp1 = 0;
int ehca_debug_level = 0;
@@ -432,8 +432,8 @@ static int ehca_destroy_aqp1(struct ehca
static ssize_t ehca_show_debug_level(struct device_driver *ddp, char *buf)
{
- return snprintf(buf, PAGE_SIZE, "%d\n",
- ehca_debug_level);
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ ehca_debug_level);
}
static ssize_t ehca_store_debug_level(struct device_driver *ddp,
@@ -778,8 +778,24 @@ void ehca_poll_eqs(unsigned long data)
spin_lock(&shca_list_lock);
list_for_each_entry(shca, &shca_list, shca_list) {
- if (shca->eq.is_initialized)
- ehca_tasklet_eq((unsigned long)(void*)shca);
+ if (shca->eq.is_initialized) {
+ /* call deadman proc only if eq ptr does not change */
+ struct ehca_eq *eq = &shca->eq;
+ int max = 3;
+ volatile u64 q_ofs, q_ofs2;
+ u64 flags;
+ spin_lock_irqsave(&eq->spinlock, flags);
+ q_ofs = eq->ipz_queue.current_q_offset;
+ spin_unlock_irqrestore(&eq->spinlock, flags);
+ do {
+ spin_lock_irqsave(&eq->spinlock, flags);
+ q_ofs2 = eq->ipz_queue.current_q_offset;
+ spin_unlock_irqrestore(&eq->spinlock, flags);
+ max--;
+ } while (q_ofs == q_ofs2 && max > 0);
+ if (q_ofs == q_ofs2)
+ ehca_process_eq(shca, 0);
+ }
}
mod_timer(&poll_eqs_timer, jiffies + HZ);
spin_unlock(&shca_list_lock);
@@ -790,7 +806,7 @@ int __init ehca_module_init(void)
int ret;
printk(KERN_INFO "eHCA Infiniband Device Driver "
- "(Rel.: SVNEHCA_0020)\n");
+ "(Rel.: SVNEHCA_0021)\n");
idr_init(&ehca_qp_idr);
idr_init(&ehca_cq_idr);
spin_lock_init(&ehca_qp_idr_lock);
diff --git a/drivers/infiniband/hw/ehca/ipz_pt_fn.h b/drivers/infiniband/hw/ehca/ipz_pt_fn.h
index dc3bda2..8199c45 100644
--- a/drivers/infiniband/hw/ehca/ipz_pt_fn.h
+++ b/drivers/infiniband/hw/ehca/ipz_pt_fn.h
@@ -79,7 +79,7 @@ static inline void *ipz_qeit_calc(struct
if (q_offset >= queue->queue_length)
return NULL;
current_page = (queue->queue_pages)[q_offset >> EHCA_PAGESHIFT];
- return ¤t_page->entries[q_offset & (EHCA_PAGESIZE - 1)];
+ return ¤t_page->entries[q_offset & (EHCA_PAGESIZE - 1)];
}
/*
@@ -247,6 +247,15 @@ static inline void *ipz_eqit_eq_get_inc_
return ret;
}
+static inline void *ipz_eqit_eq_peek_valid(struct ipz_queue *queue)
+{
+ void *ret = ipz_qeit_get(queue);
+ u32 qe = *(u8 *) ret;
+ if ((qe >> 7) != (queue->toggle_state & 1))
+ return NULL;
+ return ret;
+}
+
/* returns address (GX) of first queue entry */
static inline u64 ipz_qpt_get_firstpage(struct ipz_qpt *qpt)
{
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