From: Pierre Morel <pmorel@linux.vnet.ibm.com>
To: pasic@linux.vnet.ibm.com, bjsdjshi@linux.vnet.ibm.com
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, cohuck@redhat.com
Subject: [PATCH v2 02/10] vfio: ccw: Transform FSM functions to return state
Date: Fri, 25 May 2018 12:21:10 +0200 [thread overview]
Message-ID: <1527243678-3140-3-git-send-email-pmorel@linux.vnet.ibm.com> (raw)
In-Reply-To: <1527243678-3140-1-git-send-email-pmorel@linux.vnet.ibm.com>
We change the FSM functions to return the next state,
and adapt the fsm_func_t function type.
This will allow to factor FSM state change out of
the action routine.
Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
---
drivers/s390/cio/vfio_ccw_fsm.c | 23 ++++++++++++++---------
drivers/s390/cio/vfio_ccw_private.h | 5 +++--
2 files changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
index 24e1e04..756effb 100644
--- a/drivers/s390/cio/vfio_ccw_fsm.c
+++ b/drivers/s390/cio/vfio_ccw_fsm.c
@@ -65,7 +65,7 @@ static int fsm_io_helper(struct vfio_ccw_private *private)
return ret;
}
-static void fsm_notoper(struct vfio_ccw_private *private,
+static int fsm_notoper(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
struct subchannel *sch = private->sch;
@@ -75,31 +75,34 @@ static void fsm_notoper(struct vfio_ccw_private *private,
* Probably we should send the machine check to the guest.
*/
css_sched_sch_todo(sch, SCH_TODO_UNREG);
- private->state = VFIO_CCW_STATE_NOT_OPER;
+ return VFIO_CCW_STATE_NOT_OPER;
}
/*
* No operation action.
*/
-static void fsm_nop(struct vfio_ccw_private *private,
+static int fsm_nop(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
+ return private->state;
}
-static void fsm_io_error(struct vfio_ccw_private *private,
+static int fsm_io_error(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
pr_err("vfio-ccw: FSM: I/O request from state:%d\n", private->state);
private->io_region.ret_code = -EIO;
+ return private->state;
}
-static void fsm_io_busy(struct vfio_ccw_private *private,
+static int fsm_io_busy(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
private->io_region.ret_code = -EBUSY;
+ return private->state;
}
-static void fsm_disabled_irq(struct vfio_ccw_private *private,
+static int fsm_disabled_irq(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
struct subchannel *sch = private->sch;
@@ -109,12 +112,13 @@ static void fsm_disabled_irq(struct vfio_ccw_private *private,
* successful - should not happen, but we try to disable again.
*/
cio_disable_subchannel(sch);
+ return private->state;
}
/*
* Deal with the ccw command request from the userspace.
*/
-static void fsm_io_request(struct vfio_ccw_private *private,
+static int fsm_io_request(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
union orb *orb;
@@ -163,13 +167,13 @@ static void fsm_io_request(struct vfio_ccw_private *private,
}
err_out:
- private->state = VFIO_CCW_STATE_IDLE;
+ return VFIO_CCW_STATE_IDLE;
}
/*
* Got an interrupt for a normal io (state busy).
*/
-static void fsm_irq(struct vfio_ccw_private *private,
+static int fsm_irq(struct vfio_ccw_private *private,
enum vfio_ccw_event event)
{
struct irb *irb = &private->irb;
@@ -182,6 +186,7 @@ static void fsm_irq(struct vfio_ccw_private *private,
if (private->io_trigger)
eventfd_signal(private->io_trigger, 1);
+ return private->state;
}
/*
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h
index 78a66d9..f526b18 100644
--- a/drivers/s390/cio/vfio_ccw_private.h
+++ b/drivers/s390/cio/vfio_ccw_private.h
@@ -83,13 +83,14 @@ enum vfio_ccw_event {
/*
* Action called through jumptable.
*/
-typedef void (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event);
+typedef int (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event);
extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS];
static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private,
int event)
{
- vfio_ccw_jumptable[private->state][event](private, event);
+ private->state = vfio_ccw_jumptable[private->state][event](private,
+ event);
}
extern struct workqueue_struct *vfio_ccw_work_q;
--
2.7.4
next prev parent reply other threads:[~2018-05-25 10:23 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-25 10:21 [PATCH v2 00/10] vfio: ccw: Refactoring the VFIO CCW state machine Pierre Morel
2018-05-25 10:21 ` [PATCH v2 01/10] vfio: ccw: Moving state change out of IRQ context Pierre Morel
2018-06-04 13:52 ` Cornelia Huck
2018-06-05 13:34 ` Pierre Morel
2018-06-05 13:52 ` Cornelia Huck
2018-06-05 14:22 ` Pierre Morel
2018-05-25 10:21 ` Pierre Morel [this message]
2018-05-25 10:21 ` [PATCH v2 03/10] vfio: ccw: new SCH_EVENT event Pierre Morel
2018-05-25 10:21 ` [PATCH v2 04/10] vfio: ccw: replace IO_REQ event with SSCH_REQ event Pierre Morel
2018-05-25 10:21 ` [PATCH v2 05/10] vfio: ccw: Suppress unused event parameter Pierre Morel
2018-05-25 10:21 ` [PATCH v2 06/10] vfio: ccw: Make FSM functions atomic Pierre Morel
2018-06-05 11:38 ` Cornelia Huck
2018-06-05 13:10 ` Pierre Morel
2018-06-05 13:35 ` Cornelia Huck
2018-06-05 14:21 ` Pierre Morel
2018-06-05 15:15 ` Cornelia Huck
2018-05-25 10:21 ` [PATCH v2 07/10] vfio: ccw: FSM and mediated device initialization Pierre Morel
2018-05-25 10:21 ` [PATCH v2 08/10] vfio: ccw: Handling reset and shutdown with states Pierre Morel
2018-06-05 12:18 ` Cornelia Huck
2018-06-05 14:10 ` Pierre Morel
2018-06-05 15:27 ` Cornelia Huck
2018-06-05 16:40 ` Pierre Morel
2018-05-25 10:21 ` [PATCH v2 09/10] vfio: ccw: Suppressing the BOXED state Pierre Morel
2018-05-25 10:21 ` [PATCH v2 10/10] vfio: ccw: Let user wait when busy on IO Pierre Morel
2018-05-25 14:04 ` Heiko Carstens
2018-06-05 13:02 ` Pierre Morel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1527243678-3140-3-git-send-email-pmorel@linux.vnet.ibm.com \
--to=pmorel@linux.vnet.ibm.com \
--cc=bjsdjshi@linux.vnet.ibm.com \
--cc=cohuck@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=pasic@linux.vnet.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).