* Shrikanth Hegde <sshe...@linux.ibm.com> [2025-08-06 19:49:13]:
>
>
> On 8/5/25 11:13, Srikar Dronamraju wrote:
> > * Shrikanth Hegde <sshe...@linux.ibm.com> [2025-08-01 19:27:22]:
> >
>
> > >
> > > Could you please add a link to patch on power utils on how it is being
> > > consumed?
> >
> > I am not sure I understood your query, it looks a bit ambiguous.
> >
> > If your query is on how lparcfg data is being consumed.
> > All tools that are consuming lparcfg will continue to use the same way.
> > Since this is not changing the way lparcfg is being consumed, I think it is
> > redundant information that need not be carried in all the changes/commits to
> > lparcfg. Such an information would be required when lparcfg file was
> > created.
>
> I was saying you could point to power utils patch that you have sent which
> says how
> one would consume this.
>
> https://groups.google.com/g/powerpc-utils-devel/c/8b2Ixk8vk2w
I guess, power utils patch would need a linuxppc-dev mail reference and not
vice-versa. Since this patch would sent first and the reviewers of the power
utils patch would a need a reference to this patch.
Since this patch needs to be sent first, how do I generate a url for the
second / subsequent patch?
>
> >
> > If your query is on how resource group data is being consumed by users.
>
> > >
> > > Does MODULE_VERS need to increased?
> >
> > All tools that are consuming lparcfg will continue to use the same way.
> > If there was some conditional changes that need to be done by the tools,
> > then we should have updated the same.
> > Hence there is not need to update MODULE_VERS.
> >
>
> Since there are two new fields user scripts might need change is why i was
> suggesting
> we might need to increase MODULE_VERS
I still dont see a reason for increasing the MODULE_VERS
>
> > >
> > > > @@ -78,6 +78,8 @@ struct hvcall_ppp_data {
> > > > u8 capped;
> > > > u8 weight;
> > > > u8 unallocated_weight;
> > > > + u8 resource_group_index;
> > > > + u16 active_procs_in_resource_group;
> > > > u16 active_procs_in_pool;
> > > > u16 active_system_procs;
> > > > u16 phys_platform_procs;
> > > > @@ -86,7 +88,7 @@ struct hvcall_ppp_data {
> > > > };
> > > > /*
> > > > - * H_GET_PPP hcall returns info in 4 parms.
> > > > + * H_GET_PPP hcall returns info in 5 parms.
> > > > * entitled_capacity,unallocated_capacity,
> > > > * aggregation, resource_capability).
> > > > *
> > > > @@ -94,11 +96,11 @@ struct hvcall_ppp_data {
> > > > * R5 = Unallocated Processor Capacity Percentage.
> > > > * R6 (AABBCCDDEEFFGGHH).
> > > > * XXXX - reserved (0)
> > > > - * XXXX - reserved (0)
> > > > + * XXXX - Active Cores in Resource Group
> > > > * XXXX - Group Number
> > > > * XXXX - Pool Number.
> > > > * R7 (IIJJKKLLMMNNOOPP).
> > > > - * XX - reserved. (0)
> > > > + * XX - Resource group Number
> > > > * XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
> > > > * XX - variable processor Capacity Weight
> > > > * XX - Unallocated Variable Processor Capacity Weight.
> > > > @@ -120,9 +122,11 @@ static unsigned int h_get_ppp(struct
> > > > hvcall_ppp_data *ppp_data)
> > > > ppp_data->entitlement = retbuf[0];
> > > > ppp_data->unallocated_entitlement = retbuf[1];
> > > > + ppp_data->active_procs_in_resource_group = (retbuf[2] >> 4 * 8)
> > > > & 0xffff;
> > > > ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
> > > > ppp_data->pool_num = retbuf[2] & 0xffff;
> > > > + ppp_data->resource_group_index = (retbuf[3] >> 7 * 8) & 0xff;
> > > > ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
> > > > ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
> > > > ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
> > > > @@ -236,6 +240,13 @@ static void parse_ppp_data(struct seq_file *m)
> > > > seq_printf(m, "unallocated_capacity=%lld\n",
> > > > ppp_data.unallocated_entitlement);
> > > > + if (ppp_data.active_procs_in_resource_group) {
> > >
> > > ppp_data.active_procs_in_resource_group can ever be zero?
> > >
> > > If the entry is absent in lparcfg, then lparstat will print it as 0
> > > (which happens to be
> > > default RG, while default RG may have processors)
> >
> > If active_procs_in_resource_group is 0, then we are not printing the
> > resource group information. If active_procs_in_resource_group is non-zero
> > and resource_group_index is wrong, we need to report a bug to the firmware
> > to update it. Kernel is very transparent with respect to this information.
> > It can neither verify the information received nor should we even be doing
> > this.
> >
> > >
> The comment was more on the necessity of if statement there.
>
> + if (ppp_data.active_procs_in_resource_group) {
>
> If one runs lparstat in the LPAR, that means
> ppp_data.active_procs_in_resource_group is non zero. and when
> ppp_data.active_procs_in_resource_group is zero, i don't think one can run
> lparstat in any of such LPAR.
>
> btw, ppp_data.active_procs_in_resource_group can be fraction between 0,1 or
> is it always an integer number?
>
ppp_data.active_procs_in_resource_group being 0 is valid, it means its running
on an hypervisor, that doesn't support Resource group.
if ppp_data.active_procs_in_resource_group is non zero and
ppp_data.resource_group_index is not present, then its a bug.
ppp_data.active_procs_in_resource_group can only be integers.
--
Thanks and Regards
Srikar Dronamraju
