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@xxxxxxxxxxx>
---
drivers/lightnvm/core.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
include/linux/lightnvm.h | 2 ++
2 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index dad84dd..dc83e01 100644
--- 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
--- 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;
--
2.1.4
--
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