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Diffstat (limited to 'drivers/s390/cio/qdio_main.c')
-rw-r--r--drivers/s390/cio/qdio_main.c144
1 files changed, 74 insertions, 70 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index d79cf5bf0e6..0038750ad94 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -231,8 +231,8 @@ static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
return i;
}
-inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
- unsigned char *state, int auto_ack)
+static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
+ unsigned char *state, int auto_ack)
{
return get_buf_states(q, bufnr, state, 1, auto_ack);
}
@@ -276,7 +276,7 @@ void qdio_init_buf_states(struct qdio_irq *irq_ptr)
QDIO_MAX_BUFFERS_PER_Q);
}
-static int qdio_siga_sync(struct qdio_q *q, unsigned int output,
+static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
unsigned int input)
{
int cc;
@@ -293,7 +293,7 @@ static int qdio_siga_sync(struct qdio_q *q, unsigned int output,
return cc;
}
-inline int qdio_siga_sync_q(struct qdio_q *q)
+static inline int qdio_siga_sync_q(struct qdio_q *q)
{
if (q->is_input_q)
return qdio_siga_sync(q, 0, q->mask);
@@ -358,8 +358,7 @@ static inline int qdio_siga_input(struct qdio_q *q)
return cc;
}
-/* called from thinint inbound handler */
-void qdio_sync_after_thinint(struct qdio_q *q)
+static inline void qdio_sync_after_thinint(struct qdio_q *q)
{
if (pci_out_supported(q)) {
if (need_siga_sync_thinint(q))
@@ -370,7 +369,14 @@ void qdio_sync_after_thinint(struct qdio_q *q)
qdio_siga_sync_q(q);
}
-inline void qdio_stop_polling(struct qdio_q *q)
+int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
+ unsigned char *state)
+{
+ qdio_siga_sync_q(q);
+ return get_buf_states(q, bufnr, state, 1, 0);
+}
+
+static inline void qdio_stop_polling(struct qdio_q *q)
{
if (!q->u.in.polling)
return;
@@ -449,13 +455,6 @@ static inline void inbound_primed(struct qdio_q *q, int count)
count--;
if (!count)
return;
-
- /*
- * Need to change all PRIMED buffers to NOT_INIT, otherwise
- * we're loosing initiative in the thinint code.
- */
- set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
- count);
}
static int get_inbound_buffer_frontier(struct qdio_q *q)
@@ -470,19 +469,13 @@ static int get_inbound_buffer_frontier(struct qdio_q *q)
count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
stop = add_buf(q->first_to_check, count);
- /*
- * No siga sync here, as a PCI or we after a thin interrupt
- * will sync the queues.
- */
-
- /* need to set count to 1 for non-qebsm */
- if (!is_qebsm(q))
- count = 1;
-
-check_next:
if (q->first_to_check == stop)
goto out;
+ /*
+ * No siga sync here, as a PCI or we after a thin interrupt
+ * already sync'ed the queues.
+ */
count = get_buf_states(q, q->first_to_check, &state, count, 1);
if (!count)
goto out;
@@ -490,14 +483,9 @@ check_next:
switch (state) {
case SLSB_P_INPUT_PRIMED:
inbound_primed(q, count);
- /*
- * No siga-sync needed for non-qebsm here, as the inbound queue
- * will be synced on the next siga-r, resp.
- * tiqdio_is_inbound_q_done will do the siga-sync.
- */
q->first_to_check = add_buf(q->first_to_check, count);
atomic_sub(count, &q->nr_buf_used);
- goto check_next;
+ break;
case SLSB_P_INPUT_ERROR:
announce_buffer_error(q, count);
/* process the buffer, the upper layer will take care of it */
@@ -516,7 +504,7 @@ out:
return q->first_to_check;
}
-int qdio_inbound_q_moved(struct qdio_q *q)
+static int qdio_inbound_q_moved(struct qdio_q *q)
{
int bufnr;
@@ -524,35 +512,32 @@ int qdio_inbound_q_moved(struct qdio_q *q)
if ((bufnr != q->last_move) || q->qdio_error) {
q->last_move = bufnr;
- if (!need_siga_sync(q) && !pci_out_supported(q))
+ if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
q->u.in.timestamp = get_usecs();
-
- DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in moved");
return 1;
} else
return 0;
}
-static int qdio_inbound_q_done(struct qdio_q *q)
+static inline int qdio_inbound_q_done(struct qdio_q *q)
{
unsigned char state = 0;
if (!atomic_read(&q->nr_buf_used))
return 1;
- /*
- * We need that one for synchronization with the adapter, as it
- * does a kind of PCI avoidance.
- */
qdio_siga_sync_q(q);
-
get_buf_state(q, q->first_to_check, &state, 0);
+
if (state == SLSB_P_INPUT_PRIMED)
- /* we got something to do */
+ /* more work coming */
return 0;
- /* on VM, we don't poll, so the q is always done here */
- if (need_siga_sync(q) || pci_out_supported(q))
+ if (is_thinint_irq(q->irq_ptr))
+ return 1;
+
+ /* don't poll under z/VM */
+ if (MACHINE_IS_VM)
return 1;
/*
@@ -563,14 +548,11 @@ static int qdio_inbound_q_done(struct qdio_q *q)
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
q->first_to_check);
return 1;
- } else {
- DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in notd:%3d",
- q->first_to_check);
+ } else
return 0;
- }
}
-void qdio_kick_handler(struct qdio_q *q)
+static void qdio_kick_handler(struct qdio_q *q)
{
int start = q->first_to_kick;
int end = q->first_to_check;
@@ -619,7 +601,6 @@ again:
goto again;
}
-/* inbound tasklet */
void qdio_inbound_processing(unsigned long data)
{
struct qdio_q *q = (struct qdio_q *)data;
@@ -642,11 +623,6 @@ static int get_outbound_buffer_frontier(struct qdio_q *q)
count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
stop = add_buf(q->first_to_check, count);
- /* need to set count to 1 for non-qebsm */
- if (!is_qebsm(q))
- count = 1;
-
-check_next:
if (q->first_to_check == stop)
return q->first_to_check;
@@ -661,13 +637,7 @@ check_next:
atomic_sub(count, &q->nr_buf_used);
q->first_to_check = add_buf(q->first_to_check, count);
- /*
- * We fetch all buffer states at once. get_buf_states may
- * return count < stop. For QEBSM we do not loop.
- */
- if (is_qebsm(q))
- break;
- goto check_next;
+ break;
case SLSB_P_OUTPUT_ERROR:
announce_buffer_error(q, count);
/* process the buffer, the upper layer will take care of it */
@@ -797,8 +767,7 @@ void qdio_outbound_timer(unsigned long data)
tasklet_schedule(&q->tasklet);
}
-/* called from thinint inbound tasklet */
-void qdio_check_outbound_after_thinint(struct qdio_q *q)
+static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
{
struct qdio_q *out;
int i;
@@ -811,6 +780,46 @@ void qdio_check_outbound_after_thinint(struct qdio_q *q)
tasklet_schedule(&out->tasklet);
}
+static void __tiqdio_inbound_processing(struct qdio_q *q)
+{
+ qdio_perf_stat_inc(&perf_stats.thinint_inbound);
+ qdio_sync_after_thinint(q);
+
+ /*
+ * The interrupt could be caused by a PCI request. Check the
+ * PCI capable outbound queues.
+ */
+ qdio_check_outbound_after_thinint(q);
+
+ if (!qdio_inbound_q_moved(q))
+ return;
+
+ qdio_kick_handler(q);
+
+ if (!qdio_inbound_q_done(q)) {
+ qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop);
+ if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
+ tasklet_schedule(&q->tasklet);
+ }
+
+ qdio_stop_polling(q);
+ /*
+ * We need to check again to not lose initiative after
+ * resetting the ACK state.
+ */
+ if (!qdio_inbound_q_done(q)) {
+ qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2);
+ if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
+ tasklet_schedule(&q->tasklet);
+ }
+}
+
+void tiqdio_inbound_processing(unsigned long data)
+{
+ struct qdio_q *q = (struct qdio_q *)data;
+ __tiqdio_inbound_processing(q);
+}
+
static inline void qdio_set_state(struct qdio_irq *irq_ptr,
enum qdio_irq_states state)
{
@@ -1488,18 +1497,13 @@ out:
* @count: how many buffers to process
*/
int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
- int q_nr, int bufnr, int count)
+ int q_nr, unsigned int bufnr, unsigned int count)
{
struct qdio_irq *irq_ptr;
- if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
- (count > QDIO_MAX_BUFFERS_PER_Q) ||
- (q_nr >= QDIO_MAX_QUEUES_PER_IRQ))
+ if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
return -EINVAL;
- if (!count)
- return 0;
-
irq_ptr = cdev->private->qdio_data;
if (!irq_ptr)
return -ENODEV;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-17 00:13:01 +0000