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NTB: Disable interrupts and poll under high load 

Disable interrupts and poll under high load

Signed-off-by: Jon Mason <jon.mason@intel.com>
This commit is contained in:
Jon Mason 2013-04-18 17:59:44 -07:00
parent 78958433db
commit e8aeb60c38
3 changed files with 48 additions and 26 deletions
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42
drivers/ntb/ntb_hw.c
View File

@ -141,6 +141,24 @@ void ntb_unregister_event_callback(struct ntb_device *ndev)
ndev->event_cb = NULL;
}
static void ntb_irq_work(unsigned long data)
{
struct ntb_db_cb *db_cb = (struct ntb_db_cb *)data;
int rc;
rc = db_cb->callback(db_cb->data, db_cb->db_num);
if (rc)
tasklet_schedule(&db_cb->irq_work);
else {
struct ntb_device *ndev = db_cb->ndev;
unsigned long mask;
mask = readw(ndev->reg_ofs.ldb_mask);
clear_bit(db_cb->db_num * ndev->bits_per_vector, &mask);
writew(mask, ndev->reg_ofs.ldb_mask);
}
}
/**
* ntb_register_db_callback() - register a callback for doorbell interrupt
* @ndev: pointer to ntb_device instance
@ -155,7 +173,7 @@ void ntb_unregister_event_callback(struct ntb_device *ndev)
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
int ntb_register_db_callback(struct ntb_device *ndev, unsigned int idx,
void *data, void (*func)(void *data, int db_num))
void *data, int (*func)(void *data, int db_num))
{
unsigned long mask;
@ -166,6 +184,10 @@ int ntb_register_db_callback(struct ntb_device *ndev, unsigned int idx,
ndev->db_cb[idx].callback = func;
ndev->db_cb[idx].data = data;
ndev->db_cb[idx].ndev = ndev;
tasklet_init(&ndev->db_cb[idx].irq_work, ntb_irq_work,
(unsigned long) &ndev->db_cb[idx]);
/* unmask interrupt */
mask = readw(ndev->reg_ofs.ldb_mask);
@ -194,6 +216,8 @@ void ntb_unregister_db_callback(struct ntb_device *ndev, unsigned int idx)
set_bit(idx * ndev->bits_per_vector, &mask);
writew(mask, ndev->reg_ofs.ldb_mask);
tasklet_disable(&ndev->db_cb[idx].irq_work);
ndev->db_cb[idx].callback = NULL;
}
@ -955,12 +979,16 @@ static irqreturn_t bwd_callback_msix_irq(int irq, void *data)
{
struct ntb_db_cb *db_cb = data;
struct ntb_device *ndev = db_cb->ndev;
unsigned long mask;
dev_dbg(&ndev->pdev->dev, "MSI-X irq %d received for DB %d\n", irq,
db_cb->db_num);
if (db_cb->callback)
db_cb->callback(db_cb->data, db_cb->db_num);
mask = readw(ndev->reg_ofs.ldb_mask);
set_bit(db_cb->db_num * ndev->bits_per_vector, &mask);
writew(mask, ndev->reg_ofs.ldb_mask);
tasklet_schedule(&db_cb->irq_work);
/* No need to check for the specific HB irq, any interrupt means
* we're connected.
@ -976,12 +1004,16 @@ static irqreturn_t xeon_callback_msix_irq(int irq, void *data)
{
struct ntb_db_cb *db_cb = data;
struct ntb_device *ndev = db_cb->ndev;
unsigned long mask;
dev_dbg(&ndev->pdev->dev, "MSI-X irq %d received for DB %d\n", irq,
db_cb->db_num);
if (db_cb->callback)
db_cb->callback(db_cb->data, db_cb->db_num);
mask = readw(ndev->reg_ofs.ldb_mask);
set_bit(db_cb->db_num * ndev->bits_per_vector, &mask);
writew(mask, ndev->reg_ofs.ldb_mask);
tasklet_schedule(&db_cb->irq_work);
/* On Sandybridge, there are 16 bits in the interrupt register
* but only 4 vectors. So, 5 bits are assigned to the first 3

7
drivers/ntb/ntb_hw.h
View File

@ -106,10 +106,11 @@ struct ntb_mw {
};
struct ntb_db_cb {
void (*callback) (void *data, int db_num);
int (*callback)(void *data, int db_num);
unsigned int db_num;
void *data;
struct ntb_device *ndev;
struct tasklet_struct irq_work;
};
struct ntb_device {
@ -228,8 +229,8 @@ struct ntb_device *ntb_register_transport(struct pci_dev *pdev,
void ntb_unregister_transport(struct ntb_device *ndev);
void ntb_set_mw_addr(struct ntb_device *ndev, unsigned int mw, u64 addr);
int ntb_register_db_callback(struct ntb_device *ndev, unsigned int idx,
void *data, void (*db_cb_func) (void *data,
int db_num));
void *data, int (*db_cb_func)(void *data,
int db_num));
void ntb_unregister_db_callback(struct ntb_device *ndev, unsigned int idx);
int ntb_register_event_callback(struct ntb_device *ndev,
void (*event_cb_func) (void *handle,

25
drivers/ntb/ntb_transport.c
View File

@ -119,7 +119,6 @@ struct ntb_transport_qp {
void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data,
void *data, int len);
struct tasklet_struct rx_work;
struct list_head rx_pend_q;
struct list_head rx_free_q;
spinlock_t ntb_rx_pend_q_lock;
@ -1188,11 +1187,14 @@ err:
goto out;
}
static void ntb_transport_rx(unsigned long data)
static int ntb_transport_rxc_db(void *data, int db_num)
{
struct ntb_transport_qp *qp = (struct ntb_transport_qp *)data;
struct ntb_transport_qp *qp = data;
int rc, i;
dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n",
__func__, db_num);
/* Limit the number of packets processed in a single interrupt to
* provide fairness to others
*/
@ -1204,16 +1206,8 @@ static void ntb_transport_rx(unsigned long data)
if (qp->dma_chan)
dma_async_issue_pending(qp->dma_chan);
}
static void ntb_transport_rxc_db(void *data, int db_num)
{
struct ntb_transport_qp *qp = data;
dev_dbg(&ntb_query_pdev(qp->ndev)->dev, "%s: doorbell %d received\n",
__func__, db_num);
tasklet_schedule(&qp->rx_work);
return i;
}
static void ntb_tx_copy_callback(void *data)
@ -1446,19 +1440,15 @@ ntb_transport_create_queue(void *data, struct pci_dev *pdev,
&qp->tx_free_q);
}
tasklet_init(&qp->rx_work, ntb_transport_rx, (unsigned long) qp);
rc = ntb_register_db_callback(qp->ndev, free_queue, qp,
ntb_transport_rxc_db);
if (rc)
goto err3;
goto err2;
dev_info(&pdev->dev, "NTB Transport QP %d created\n", qp->qp_num);
return qp;
err3:
tasklet_disable(&qp->rx_work);
err2:
while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
kfree(entry);
@ -1505,7 +1495,6 @@ void ntb_transport_free_queue(struct ntb_transport_qp *qp)
}
ntb_unregister_db_callback(qp->ndev, qp->qp_num);
tasklet_disable(&qp->rx_work);
cancel_delayed_work_sync(&qp->link_work);