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path: root/drivers/s390/scsi/zfcp_qdio.c
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Diffstat (limited to 'drivers/s390/scsi/zfcp_qdio.c')
-rw-r--r--drivers/s390/scsi/zfcp_qdio.c47
1 files changed, 25 insertions, 22 deletions
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index 33e0a206a0a4..e0a215309df0 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -11,9 +11,6 @@
#include "zfcp_ext.h"
-/* FIXME(tune): free space should be one max. SBAL chain plus what? */
-#define ZFCP_QDIO_PCI_INTERVAL (QDIO_MAX_BUFFERS_PER_Q \
- - (FSF_MAX_SBALS_PER_REQ + 4))
#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
@@ -58,7 +55,7 @@ void zfcp_qdio_free(struct zfcp_adapter *adapter)
}
}
-static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id)
+static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, char *id)
{
dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
@@ -77,6 +74,23 @@ static void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int cnt)
}
}
+/* this needs to be called prior to updating the queue fill level */
+static void zfcp_qdio_account(struct zfcp_adapter *adapter)
+{
+ ktime_t now;
+ s64 span;
+ int free, used;
+
+ spin_lock(&adapter->qdio_stat_lock);
+ now = ktime_get();
+ span = ktime_us_delta(now, adapter->req_q_time);
+ free = max(0, atomic_read(&adapter->req_q.count));
+ used = QDIO_MAX_BUFFERS_PER_Q - free;
+ adapter->req_q_util += used * span;
+ adapter->req_q_time = now;
+ spin_unlock(&adapter->qdio_stat_lock);
+}
+
static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
int queue_no, int first, int count,
unsigned long parm)
@@ -86,13 +100,14 @@ static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err,
if (unlikely(qdio_err)) {
zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
- zfcp_qdio_handler_error(adapter, 140);
+ zfcp_qdio_handler_error(adapter, "qdireq1");
return;
}
/* cleanup all SBALs being program-owned now */
zfcp_qdio_zero_sbals(queue->sbal, first, count);
+ zfcp_qdio_account(adapter);
atomic_add(count, &queue->count);
wake_up(&adapter->request_wq);
}
@@ -154,7 +169,7 @@ static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
if (unlikely(qdio_err)) {
zfcp_hba_dbf_event_qdio(adapter, qdio_err, first, count);
- zfcp_qdio_handler_error(adapter, 147);
+ zfcp_qdio_handler_error(adapter, "qdires1");
return;
}
@@ -346,21 +361,12 @@ int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
struct zfcp_qdio_queue *req_q = &adapter->req_q;
int first = fsf_req->sbal_first;
int count = fsf_req->sbal_number;
- int retval, pci, pci_batch;
- struct qdio_buffer_element *sbale;
+ int retval;
+ unsigned int qdio_flags = QDIO_FLAG_SYNC_OUTPUT;
- /* acknowledgements for transferred buffers */
- pci_batch = adapter->req_q_pci_batch + count;
- if (unlikely(pci_batch >= ZFCP_QDIO_PCI_INTERVAL)) {
- pci_batch %= ZFCP_QDIO_PCI_INTERVAL;
- pci = first + count - (pci_batch + 1);
- pci %= QDIO_MAX_BUFFERS_PER_Q;
- sbale = zfcp_qdio_sbale(req_q, pci, 0);
- sbale->flags |= SBAL_FLAGS0_PCI;
- }
+ zfcp_qdio_account(adapter);
- retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, first,
- count);
+ retval = do_QDIO(adapter->ccw_device, qdio_flags, 0, first, count);
if (unlikely(retval)) {
zfcp_qdio_zero_sbals(req_q->sbal, first, count);
return retval;
@@ -370,7 +376,6 @@ int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
atomic_sub(count, &req_q->count);
req_q->first += count;
req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
- adapter->req_q_pci_batch = pci_batch;
return 0;
}
@@ -441,7 +446,6 @@ void zfcp_qdio_close(struct zfcp_adapter *adapter)
}
req_q->first = 0;
atomic_set(&req_q->count, 0);
- adapter->req_q_pci_batch = 0;
adapter->resp_q.first = 0;
atomic_set(&adapter->resp_q.count, 0);
}
@@ -479,7 +483,6 @@ int zfcp_qdio_open(struct zfcp_adapter *adapter)
/* set index of first avalable SBALS / number of available SBALS */
adapter->req_q.first = 0;
atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
- adapter->req_q_pci_batch = 0;
return 0;