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author | Matias Bjørling <m@bjorling.me> | 2016-01-12 07:49:30 +0100 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2016-01-12 08:21:17 -0700 |
commit | 09719b62fdab031e39b39a6470364a372abdf3f4 (patch) | |
tree | 149130e72879af4aa048967694c3927d3e397a63 /drivers/lightnvm | |
parent | 72d256ecc5d0c8cbcc0bd5c6d983b434df556cb4 (diff) | |
download | linux-stable-09719b62fdab031e39b39a6470364a372abdf3f4.tar.gz linux-stable-09719b62fdab031e39b39a6470364a372abdf3f4.tar.bz2 linux-stable-09719b62fdab031e39b39a6470364a372abdf3f4.zip |
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>
Diffstat (limited to 'drivers/lightnvm')
-rw-r--r-- | drivers/lightnvm/core.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index dad84ddbefb4..dc83e010d084 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; |