Hi Babu, On 8/5/25 4:30 PM, Babu Moger wrote: > "io_alloc" enables direct insertion of data from I/O devices into the > cache. > > On AMD systems, "io_alloc" feature is backed by L3 Smart Data Cache > Injection Allocation Enforcement (SDCIAE). Change SDCIAE state by setting > (to enable) or clearing (to disable) bit 1 of MSR L3_QOS_EXT_CFG on all > logical processors within the cache domain. > > Introduce architecture-specific call to enable and disable the feature. > > The SDCIAE feature details are available in APM listed below [1]. > [1] AMD64 Architecture Programmer's Manual Volume 2: System Programming > Publication # 24593 Revision 3.41 section 19.4.7 L3 Smart Data Cache > Injection Allocation Enforcement (SDCIAE) > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 fyi ... Documentation/process/maintainer-tip.rst has some examples how the "Link:" can be associated with the changelog. For example, above could be: The SDCIAE feature details are available in APM [1] available from [2]. [1] ... Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 # [2] > Signed-off-by: Babu Moger <babu.moger@xxxxxxx> > --- Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx> Reinette
