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Index: sys/cam/cam.h
===================================================================
--- sys/cam/cam.h
+++ sys/cam/cam.h
@@ -94,8 +94,9 @@
u_int32_t generation;
int index;
#define CAM_UNQUEUED_INDEX -1
-#define CAM_ACTIVE_INDEX -2
-#define CAM_DONEQ_INDEX -3
+#define CAM_ACTIVE_INDEX -2
+#define CAM_DONEQ_INDEX -3
+#define CAM_ASYNC_INDEX -4
#define CAM_EXTRAQ_INDEX INT_MAX
} cam_pinfo;
Index: sys/cam/cam_xpt.c
===================================================================
--- sys/cam/cam_xpt.c
+++ sys/cam/cam_xpt.c
@@ -180,6 +180,7 @@
static struct cam_doneq cam_doneqs[MAXCPU];
static u_int __read_mostly cam_num_doneqs;
static struct proc *cam_proc;
+static struct cam_doneq cam_async;
SYSCTL_INT(_kern_cam, OID_AUTO, num_doneqs, CTLFLAG_RDTUN,
&cam_num_doneqs, 0, "Number of completion queues/threads");
@@ -271,6 +272,7 @@
static void camisr_runqueue(void);
static void xpt_done_process(struct ccb_hdr *ccb_h);
static void xpt_done_td(void *);
+static void xpt_async_td(void *);
static dev_match_ret xptbusmatch(struct dev_match_pattern *patterns,
u_int num_patterns, struct cam_eb *bus);
static dev_match_ret xptdevicematch(struct dev_match_pattern *patterns,
@@ -972,6 +974,15 @@
return (ENOMEM);
}
+ mtx_init(&cam_async.cam_doneq_mtx, "CAM async", NULL, MTX_DEF);
+ STAILQ_INIT(&cam_async.cam_doneq);
+ if (kproc_kthread_add(xpt_async_td, &cam_async,
+ &cam_proc, NULL, 0, 0, "cam", "async") != 0) {
+ printf("xpt_init: Cannot init async thread "
+ "- failing attach\n");
+ return (ENOMEM);
+ }
+
/*
* Register a callback for when interrupts are enabled.
*/
@@ -3146,8 +3157,16 @@
xpt_done(start_ccb);
break;
case XPT_ASYNC:
+ /*
+ * Queue the async operation so it can be run from a sleepable
+ * context.
+ */
start_ccb->ccb_h.status = CAM_REQ_CMP;
- xpt_done(start_ccb);
+ mtx_lock(&cam_async.cam_doneq_mtx);
+ STAILQ_INSERT_TAIL(&cam_async.cam_doneq, &start_ccb->ccb_h, sim_links.stqe);
+ start_ccb->ccb_h.pinfo.index = CAM_ASYNC_INDEX;
+ mtx_unlock(&cam_async.cam_doneq_mtx);
+ wakeup(&cam_async.cam_doneq);
break;
default:
case XPT_SDEV_TYPE:
@@ -5472,6 +5491,34 @@
mtx_unlock(mtx);
}
+/*
+ * Parameterize instead and use xpt_done_td?
+ */
+static void
+xpt_async_td(void *arg)
+{
+ struct cam_doneq *queue = arg;
+ struct ccb_hdr *ccb_h;
+ STAILQ_HEAD(, ccb_hdr) doneq;
+
+ STAILQ_INIT(&doneq);
+ mtx_lock(&queue->cam_doneq_mtx);
+ while (1) {
+ while (STAILQ_EMPTY(&queue->cam_doneq))
+ msleep(&queue->cam_doneq, &queue->cam_doneq_mtx,
+ PRIBIO, "-", 0);
+ STAILQ_CONCAT(&doneq, &queue->cam_doneq);
+ mtx_unlock(&queue->cam_doneq_mtx);
+
+ while ((ccb_h = STAILQ_FIRST(&doneq)) != NULL) {
+ STAILQ_REMOVE_HEAD(&doneq, sim_links.stqe);
+ xpt_done_process(ccb_h);
+ }
+
+ mtx_lock(&queue->cam_doneq_mtx);
+ }
+}
+
void
xpt_done_td(void *arg)
{

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