diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2025-02-28 03:26:31 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2025-03-06 22:13:13 +0300 |
| commit | fb39e9092be5a18eaab05b5a2492741fe6e395fe (patch) | |
| tree | 00483d265d6b844759e24c786076bb65a8ae3745 /include | |
| parent | 0e79a47fb197b6937709a2af2a138c526a9bc374 (diff) | |
| download | linux-fb39e9092be5a18eaab05b5a2492741fe6e395fe.tar.xz | |
fwctl: FWCTL_INFO to return basic information about the device
Userspace will need to know some details about the fwctl interface being
used to locate the correct userspace code to communicate with the
kernel. Provide a simple device_type enum indicating what the kernel
driver is.
Allow the device to provide a device specific info struct that contains
any additional information that the driver may need to provide to
userspace.
Link: https://patch.msgid.link/r/3-v5-642aa0c94070+4447f-fwctl_jgg@nvidia.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Tested-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fwctl.h | 12 | ||||
| -rw-r--r-- | include/uapi/fwctl/fwctl.h | 31 |
2 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/fwctl.h b/include/linux/fwctl.h index faa4b2c780e0..700a5be940e3 100644 --- a/include/linux/fwctl.h +++ b/include/linux/fwctl.h @@ -7,6 +7,7 @@ #include <linux/device.h> #include <linux/cdev.h> #include <linux/cleanup.h> +#include <uapi/fwctl/fwctl.h> struct fwctl_device; struct fwctl_uctx; @@ -20,6 +21,10 @@ struct fwctl_uctx; */ struct fwctl_ops { /** + * @device_type: The drivers assigned device_type number. This is uABI. + */ + enum fwctl_device_type device_type; + /** * @uctx_size: The size of the fwctl_uctx struct to allocate. The first * bytes of this memory will be a fwctl_uctx. The driver can use the * remaining bytes as its private memory. @@ -35,6 +40,13 @@ struct fwctl_ops { * is closed. */ void (*close_uctx)(struct fwctl_uctx *uctx); + /** + * @info: Implement FWCTL_INFO. Return a kmalloc() memory that is copied + * to out_device_data. On input length indicates the size of the user + * buffer on output it indicates the size of the memory. The driver can + * ignore length on input, the core code will handle everything. + */ + void *(*info)(struct fwctl_uctx *uctx, size_t *length); }; /** diff --git a/include/uapi/fwctl/fwctl.h b/include/uapi/fwctl/fwctl.h index 8f5fe821cf28..4052df63f66d 100644 --- a/include/uapi/fwctl/fwctl.h +++ b/include/uapi/fwctl/fwctl.h @@ -4,6 +4,9 @@ #ifndef _UAPI_FWCTL_H #define _UAPI_FWCTL_H +#include <linux/types.h> +#include <linux/ioctl.h> + #define FWCTL_TYPE 0x9A /** @@ -33,6 +36,34 @@ */ enum { FWCTL_CMD_BASE = 0, + FWCTL_CMD_INFO = 0, +}; + +enum fwctl_device_type { + FWCTL_DEVICE_TYPE_ERROR = 0, +}; + +/** + * struct fwctl_info - ioctl(FWCTL_INFO) + * @size: sizeof(struct fwctl_info) + * @flags: Must be 0 + * @out_device_type: Returns the type of the device from enum fwctl_device_type + * @device_data_len: On input the length of the out_device_data memory. On + * output the size of the kernel's device_data which may be larger or + * smaller than the input. Maybe 0 on input. + * @out_device_data: Pointer to a memory of device_data_len bytes. Kernel will + * fill the entire memory, zeroing as required. + * + * Returns basic information about this fwctl instance, particularly what driver + * is being used to define the device_data format. + */ +struct fwctl_info { + __u32 size; + __u32 flags; + __u32 out_device_type; + __u32 device_data_len; + __aligned_u64 out_device_data; }; +#define FWCTL_INFO _IO(FWCTL_TYPE, FWCTL_CMD_INFO) #endif |