lightnvm: introduce nvm_submit_ppa

Internal logic for both core and media managers, does not have a
backing bio for issuing I/Os. Introduce nvm_submit_ppa to allow raw
I/Os to be submitted to the underlying device driver.

The function request the device, ppa, data buffer and its length and
will submit the I/O synchronously to the device. The return value may
therefore be used to detect any errors regarding the issued I/O.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index dad84dd..dc83e01 100644 (file)
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -296,7 +296,7 @@ void nvm_end_io(struct nvm_rq *rqd, int error)
 }
 EXPORT_SYMBOL(nvm_end_io);
 
-static void nvm_end_io_sync(struct nvm_rq *rqd, int errors)
+static void nvm_end_io_sync(struct nvm_rq *rqd)
 {
        struct completion *waiting = rqd->wait;
 
@@ -305,6 +305,49 @@ static void nvm_end_io_sync(struct nvm_rq *rqd, int errors)
        complete(waiting);
 }
 
+int nvm_submit_ppa(struct nvm_dev *dev, struct ppa_addr *ppa, int nr_ppas,
+                               int opcode, int flags, void *buf, int len)
+{
+       DECLARE_COMPLETION_ONSTACK(wait);
+       struct nvm_rq rqd;
+       struct bio *bio;
+       int ret;
+       unsigned long hang_check;
+
+       bio = bio_map_kern(dev->q, buf, len, GFP_KERNEL);
+       if (IS_ERR_OR_NULL(bio))
+               return -ENOMEM;
+
+       memset(&rqd, 0, sizeof(struct nvm_rq));
+       ret = nvm_set_rqd_ppalist(dev, &rqd, ppa, nr_ppas);
+       if (ret) {
+               bio_put(bio);
+               return ret;
+       }
+
+       rqd.opcode = opcode;
+       rqd.bio = bio;
+       rqd.wait = &wait;
+       rqd.dev = dev;
+       rqd.end_io = nvm_end_io_sync;
+       rqd.flags = flags;
+       nvm_generic_to_addr_mode(dev, &rqd);
+
+       ret = dev->ops->submit_io(dev, &rqd);
+
+       /* Prevent hang_check timer from firing at us during very long I/O */
+       hang_check = sysctl_hung_task_timeout_secs;
+       if (hang_check)
+               while (!wait_for_completion_io_timeout(&wait, hang_check * (HZ/2)));
+       else
+               wait_for_completion_io(&wait);
+
+       nvm_free_rqd_ppalist(dev, &rqd);
+
+       return rqd.error;
+}
+EXPORT_SYMBOL(nvm_submit_ppa);
+
 static int nvm_core_init(struct nvm_dev *dev)
 {
        struct nvm_id *id = &dev->identity;

diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 9acc71a..b700148 100644 (file)
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -440,6 +440,8 @@ extern void nvm_free_rqd_ppalist(struct nvm_dev *, struct nvm_rq *);
 extern int nvm_erase_ppa(struct nvm_dev *, struct ppa_addr *, int);
 extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
 extern void nvm_end_io(struct nvm_rq *, int);
+extern int nvm_submit_ppa(struct nvm_dev *, struct ppa_addr *, int, int, int,
+                                                               void *, int);
 #else /* CONFIG_NVM */
 struct nvm_dev_ops;