GenWQE: Support blocking when DDCB queue is busy
When the GenWQE hardware queue was busy, the driver returned simply
-EBUSY. This caused polling by applications which increased the load
on the already busy system. This change implements the possiblity to
sleep on a waitqueue instead when the DDCB queue is busy. The
requestor is woken up when there is free space on the queue again.
The old way to get -EBUSY is still available if the device is openend
with O_NONBLOCKING. The default is now blocking behavior.
Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/genwqe/card_dev.c b/drivers/misc/genwqe/card_dev.c
index 59e0081..5918586 100644
--- a/drivers/misc/genwqe/card_dev.c
+++ b/drivers/misc/genwqe/card_dev.c
@@ -516,6 +516,7 @@
u32 crc;
u8 cmdopts;
struct genwqe_dev *cd = cfile->cd;
+ struct file *filp = cfile->filp;
struct pci_dev *pci_dev = cd->pci_dev;
if ((load->size & 0x3) != 0)
@@ -610,7 +611,7 @@
/* For Genwqe5 we get back the calculated CRC */
*(u64 *)&req->asv[0] = 0ULL; /* 0x80 */
- rc = __genwqe_execute_raw_ddcb(cd, req);
+ rc = __genwqe_execute_raw_ddcb(cd, req, filp->f_flags);
load->retc = req->retc;
load->attn = req->attn;
@@ -650,6 +651,7 @@
u8 *xbuf;
u8 cmdopts;
struct genwqe_dev *cd = cfile->cd;
+ struct file *filp = cfile->filp;
struct pci_dev *pci_dev = cd->pci_dev;
struct genwqe_ddcb_cmd *cmd;
@@ -727,7 +729,7 @@
/* we only get back the calculated CRC */
*(u64 *)&cmd->asv[0] = 0ULL; /* 0x80 */
- rc = __genwqe_execute_raw_ddcb(cd, cmd);
+ rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
load->retc = cmd->retc;
load->attn = cmd->attn;
@@ -988,13 +990,14 @@
{
int rc;
struct genwqe_dev *cd = cfile->cd;
+ struct file *filp = cfile->filp;
struct ddcb_requ *req = container_of(cmd, struct ddcb_requ, cmd);
rc = ddcb_cmd_fixups(cfile, req);
if (rc != 0)
return rc;
- rc = __genwqe_execute_raw_ddcb(cd, cmd);
+ rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
ddcb_cmd_cleanup(cfile, req);
return rc;
}
@@ -1006,6 +1009,7 @@
struct genwqe_ddcb_cmd *cmd;
struct ddcb_requ *req;
struct genwqe_dev *cd = cfile->cd;
+ struct file *filp = cfile->filp;
cmd = ddcb_requ_alloc();
if (cmd == NULL)
@@ -1021,7 +1025,7 @@
if (!raw)
rc = genwqe_execute_ddcb(cfile, cmd);
else
- rc = __genwqe_execute_raw_ddcb(cd, cmd);
+ rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
/* Copy back only the modifed fields. Do not copy ASIV
back since the copy got modified by the driver. */