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dmaengine: idxd: create idxd_device sub-driver

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The original architecture of /sys/bus/dsa invented a scheme whereby a
single entry in the list of bus drivers, /sys/bus/drivers/dsa, handled
all device types and internally routed them to different drivers.
Those internal drivers were invisible to userspace. Now, as
/sys/bus/dsa wants to grow support for alternate drivers for a given
device, for example vfio-mdev instead of kernel-internal-dmaengine, a
proper bus device-driver model is needed. The first step in that process
is separating the existing omnibus/implicit "dsa" driver into proper
individual drivers registered on /sys/bus/dsa. Establish the idxd_drv
driver that control the enabling and disabling of the accelerator device.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162637466439.744545.15210886092627144577.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2021-07-15 11:44:24 -07:00 committed by Vinod Koul
parent 5fee6567ec
commit 034b3290ba
3 changed files with 23 additions and 0 deletions
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13
drivers/dma/idxd/device.c
View File

@ -1349,3 +1349,16 @@ void idxd_device_drv_remove(struct idxd_dev *idxd_dev)
if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
idxd_device_reset(idxd);
}
static enum idxd_dev_type dev_types[] = {
IDXD_DEV_DSA,
IDXD_DEV_IAX,
IDXD_DEV_NONE,
};
struct idxd_device_driver idxd_drv = {
.type = dev_types,
.probe = idxd_device_drv_probe,
.remove = idxd_device_drv_remove,
.name = "idxd",
};

3
drivers/dma/idxd/idxd.h
View File

@ -58,6 +58,7 @@ struct idxd_device_driver {
};
extern struct idxd_device_driver dsa_drv;
extern struct idxd_device_driver idxd_drv;
struct idxd_irq_entry {
struct idxd_device *idxd;
@ -501,6 +502,8 @@ void idxd_mask_msix_vector(struct idxd_device *idxd, int vec_id);
void idxd_unmask_msix_vector(struct idxd_device *idxd, int vec_id);
/* device control */
int idxd_register_idxd_drv(void);
void idxd_unregister_idxd_drv(void);
int idxd_device_drv_probe(struct idxd_dev *idxd_dev);
void idxd_device_drv_remove(struct idxd_dev *idxd_dev);
int drv_enable_wq(struct idxd_wq *wq);

7
drivers/dma/idxd/init.c
View File

@ -840,6 +840,10 @@ static int __init idxd_init_module(void)
if (err < 0)
return err;
err = idxd_driver_register(&idxd_drv);
if (err < 0)
goto err_idxd_driver_register;
err = idxd_driver_register(&dsa_drv);
if (err < 0)
goto err_dsa_driver_register;
@ -859,6 +863,8 @@ err_pci_register:
err_cdev_register:
idxd_driver_unregister(&dsa_drv);
err_dsa_driver_register:
idxd_driver_unregister(&idxd_drv);
err_idxd_driver_register:
idxd_unregister_bus_type();
return err;
}
@ -866,6 +872,7 @@ module_init(idxd_init_module);
static void __exit idxd_exit_module(void)
{
idxd_driver_unregister(&idxd_drv);
idxd_driver_unregister(&dsa_drv);
pci_unregister_driver(&idxd_pci_driver);
idxd_cdev_remove();