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| author | Nipun Gupta <nipun.gupta@amd.com> | 2023-09-15 07:54:21 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2023-09-28 21:12:07 +0300 |
| commit | a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3 (patch) | |
| tree | 10bcc48828fc5741e1cbce64efe13916ab971288 /include/linux/cdx/cdx_bus.h | |
| parent | a1e16a38968806b5fc855e17bc124d752a6b7fc8 (diff) | |
| download | linux-a941b784b15ff65e1a3b6a259c6d6cf7fa0bb3c3.tar.xz | |
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 'include/linux/cdx/cdx_bus.h')
| -rw-r--r-- | include/linux/cdx/cdx_bus.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/cdx/cdx_bus.h b/include/linux/cdx/cdx_bus.h index bead71b7bc73..8320ec3b9e37 100644 --- a/include/linux/cdx/cdx_bus.h +++ b/include/linux/cdx/cdx_bus.h @@ -21,11 +21,13 @@ struct cdx_controller; enum { + CDX_DEV_BUS_MASTER_CONF, CDX_DEV_RESET_CONF, }; struct cdx_device_config { u8 type; + bool bus_master_enable; }; typedef int (*cdx_scan_cb)(struct cdx_controller *cdx); @@ -170,4 +172,20 @@ extern struct bus_type cdx_bus_type; */ int cdx_dev_reset(struct device *dev); +/** + * cdx_set_master - enables bus-mastering for CDX device + * @cdx_dev: the CDX device to enable + * + * Return: 0 for success, -errno on failure + */ +int cdx_set_master(struct cdx_device *cdx_dev); + +/** + * cdx_clear_master - disables bus-mastering for CDX device + * @cdx_dev: the CDX device to disable + * + * Return: 0 for success, -errno on failure + */ +int cdx_clear_master(struct cdx_device *cdx_dev); + #endif /* _CDX_BUS_H_ */ |