diff options
| author | Dave Jiang <dave.jiang@intel.com> | 2020-01-21 16:44:29 -0700 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-01-24 11:18:45 +0530 |
| commit | 42d279f9137ab7d5503836baec2739284b278d8f (patch) | |
| tree | d2876eeee15f34802ffe1d20f5ff0a331ba08d48 /drivers/dma/idxd/init.c | |
| parent | 8f47d1a5e545f903cd049c42da31a3be36178447 (diff) | |
| download | lwn-42d279f9137ab7d5503836baec2739284b278d8f.tar.gz lwn-42d279f9137ab7d5503836baec2739284b278d8f.zip | |
dmaengine: idxd: add char driver to expose submission portal to userland
Create a char device region that will allow acquisition of user portals in
order to allow applications to submit DMA operations. A char device will be
created per work queue that gets exposed. The workqueue type "user"
is used to mark a work queue for user char device. For example if the
workqueue 0 of DSA device 0 is marked for char device, then a device node
of /dev/dsa/wq0.0 will be created.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/157965026985.73301.976523230037106742.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/idxd/init.c')
| -rw-r--r-- | drivers/dma/idxd/init.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index cf6e1d89dd02..7778c05deb5d 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -188,6 +188,7 @@ static int idxd_setup_internals(struct idxd_device *idxd) mutex_init(&wq->wq_lock); atomic_set(&wq->dq_count, 0); init_waitqueue_head(&wq->submit_waitq); + wq->idxd_cdev.minor = -1; rc = percpu_init_rwsem(&wq->submit_lock); if (rc < 0) { idxd_wqs_free_lock(idxd); @@ -321,6 +322,8 @@ static int idxd_probe(struct idxd_device *idxd) goto err_idr_fail; } + idxd->major = idxd_cdev_get_major(idxd); + dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id); return 0; @@ -501,6 +504,10 @@ static int __init idxd_init_module(void) if (err < 0) goto err_idxd_driver_register; + err = idxd_cdev_register(); + if (err) + goto err_cdev_register; + err = pci_register_driver(&idxd_pci_driver); if (err) goto err_pci_register; @@ -508,6 +515,8 @@ static int __init idxd_init_module(void) return 0; err_pci_register: + idxd_cdev_remove(); +err_cdev_register: idxd_unregister_driver(); err_idxd_driver_register: idxd_unregister_bus_type(); @@ -518,6 +527,7 @@ module_init(idxd_init_module); static void __exit idxd_exit_module(void) { pci_unregister_driver(&idxd_pci_driver); + idxd_cdev_remove(); idxd_unregister_bus_type(); } module_exit(idxd_exit_module); |