Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=78d8d5f9ef8d6179e92b94481cfdfc45d396992f
Commit:     78d8d5f9ef8d6179e92b94481cfdfc45d396992f
Parent:     551fd6122d247d76124c4fdb6eb898cc8e3d74aa
Author:     Hoang-Nam Nguyen <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 15 17:06:33 2007 +0100
Committer:  Roland Dreier <[EMAIL PROTECTED]>
CommitDate: Fri Feb 16 13:57:34 2007 -0800

    IB/ehca: Rework irq handler
    
    Rework ehca interrupt handling to avoid/reduce missed irq events.
    
    Signed-off-by: Hoang-Nam Nguyen <[EMAIL PROTECTED]>
    Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
---
 drivers/infiniband/hw/ehca/ehca_classes.h |   18 ++-
 drivers/infiniband/hw/ehca/ehca_eq.c      |    1 +
 drivers/infiniband/hw/ehca/ehca_irq.c     |  216 ++++++++++++++++++-----------
 drivers/infiniband/hw/ehca/ehca_irq.h     |    1 +
 drivers/infiniband/hw/ehca/ehca_main.c    |   28 +++-
 drivers/infiniband/hw/ehca/ipz_pt_fn.h    |   11 ++-
 6 files changed, 183 insertions(+), 92 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 24ceab0..4961eb8 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 *shca,
        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 ehca_shca *shca,
 }
 
 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 *shca, u64 eqe)
                          "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 *shca, u64 eqe)
                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, void *dev_id)
        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);
-
-               if ((shca->hw_level >= 2) && eqe)
-                       int_state = 1;
-               else
-                       int_state = 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;
-                                       }
-
-                                       reset_eq_pending(cq);
+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);
+               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);
+               spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+               comp_event_callback(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);
-                       }
+       } else {
+               ehca_dbg(&shca->ib_device,
+                        "Got non completion event");
+               parse_identifier(shca, eqe_value);
+       }
+}
 
-                       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);
+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;
+
+       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);
+       }
 
+       /* 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
+                       spin_lock(&ehca_cq_idr_lock);
+                       queue_comp_task(eq->eqe_cache[i].cq);
+                       spin_unlock(&ehca_cq_idr_lock);
+#else
+                       comp_event_callback(eq->eqe_cache[i].cq);
+#endif
+               } 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);
+
+unlock_irq_spinlock:
+       spin_unlock_irqrestore(&eq->irq_spinlock, flags);
+}
 
-       return;
+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_comp_pool *pool,
        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 <[EMAIL PROTECTED]>");
 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_sport *sport)
 
 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 ipz_queue *queue, 
u64 q_offset)
        if (q_offset >= queue->queue_length)
                return NULL;
        current_page = (queue->queue_pages)[q_offset >> EHCA_PAGESHIFT];
-       return  &current_page->entries[q_offset & (EHCA_PAGESIZE - 1)];
+       return &current_page->entries[q_offset & (EHCA_PAGESIZE - 1)];
 }
 
 /*
@@ -247,6 +247,15 @@ static inline void *ipz_eqit_eq_get_inc_valid(struct 
ipz_queue *queue)
        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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