20 Nov
2023
20 Nov
'23
8:34 a.m.
From: Liu, Yi L yi.l.liu@intel.com Sent: Monday, November 20, 2023 4:30 PM
On 2023/11/20 16:09, Tian, Kevin wrote:
From: Liu, Yi L yi.l.liu@intel.com Sent: Friday, November 17, 2023 9:07 PM
- @req_len: Length (in bytes) of a request entry in the request array
- @req_num: Input the number of cache invalidation requests in the
array.
Output the number of requests successfully handled by kernel.
- @out_driver_error_code: Report a driver speicifc error code upon
failure.
It's optional, driver has a choice to fill it or
not.Being optional how does the user tell whether the code is filled or not?
seems like we need a flag for it. otherwise, a reserved special value is required. or is it enough to just document it that this field is available or not per the iommu_hw_info_type?
No guarantee that a reserved special value applies to all vendors.
I'll just remove the optional part. the viommu driver knows what a valid code is, if the driver fills it.