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dmaengine: idxd: add char driver to expose submission portal to userland

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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>
This commit is contained in:
Dave Jiang
2020-01-21 16:44:29 -07:00
committed by Vinod Koul
parent 8f47d1a5e5
commit 42d279f913
8 changed files with 422 additions and 5 deletions
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10
drivers/dma/idxd/init.c
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@@ -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);