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| author |  Nipun Gupta <nipun.gupta@amd.com>
| 2023-09-15 10:24:21 +0530 |
|---|---|---|
| committer |  Alex Williamson <alex.williamson@redhat.com>
| 2023-09-28 12:12:07 -0600 |
| commit | a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3 (patch) | |
| tree | 10bcc48828fc5741e1cbce64efe13916ab971288 /drivers/cdx/cdx.c | |
| parent | Merge branch 'mlx5-vfio' of https://git.kernel.org/pub/scm/linux/kernel/git/m... (diff) | |
| download | linux-a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3.tar.gz linux-a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3.tar.bz2 linux-a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3.zip | |
cdx: add support for bus mastering
Introduce cdx_set_master() and cdx_clear_master() APIs to support
enable and disable of bus mastering. Drivers need to use these APIs to
enable/disable DMAs from the CDX devices.
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Link: https://lore.kernel.org/r/20230915045423.31630-1-nipun.gupta@amd.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/cdx/cdx.c')
| -rw-r--r-- | drivers/cdx/cdx.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/cdx/cdx.c b/drivers/cdx/cdx.c index d2cad4c670a0..9efb7584f952 100644 --- a/drivers/cdx/cdx.c +++ b/drivers/cdx/cdx.c @@ -182,6 +182,38 @@ cdx_match_id(const struct cdx_device_id *ids, struct cdx_device *dev) return NULL; } +int cdx_set_master(struct cdx_device *cdx_dev) +{ + struct cdx_controller *cdx = cdx_dev->cdx; + struct cdx_device_config dev_config; + int ret = -EOPNOTSUPP; + + dev_config.type = CDX_DEV_BUS_MASTER_CONF; + dev_config.bus_master_enable = true; + if (cdx->ops->dev_configure) + ret = cdx->ops->dev_configure(cdx, cdx_dev->bus_num, + cdx_dev->dev_num, &dev_config); + + return ret; +} +EXPORT_SYMBOL_GPL(cdx_set_master); + +int cdx_clear_master(struct cdx_device *cdx_dev) +{ + struct cdx_controller *cdx = cdx_dev->cdx; + struct cdx_device_config dev_config; + int ret = -EOPNOTSUPP; + + dev_config.type = CDX_DEV_BUS_MASTER_CONF; + dev_config.bus_master_enable = false; + if (cdx->ops->dev_configure) + ret = cdx->ops->dev_configure(cdx, cdx_dev->bus_num, + cdx_dev->dev_num, &dev_config); + + return ret; +} +EXPORT_SYMBOL_GPL(cdx_clear_master); + /** * cdx_bus_match - device to driver matching callback * @dev: the cdx device to match against |