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thermal: intel: hfi: Give HFI instances package scope

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The Intel Software Developer's Manual defines the scope of HFI (registers
and memory buffer) as a package. Use package scope(*) in the software
representation of an HFI instance.

Using die scope in HFI instances has the effect of creating multiple
conflicting instances for the same package: each instance allocates its
own memory buffer and configures the same package-level registers.
Specifically, only one of the allocated memory buffers can be set in the
MSR_IA32_HW_FEEDBACK_PTR register. CPUs get incorrect HFI data from the
table.

The problem does not affect current HFI-capable platforms because they
all have single-die processors.

(*) We used die scope for HFI instances because there had been
    processors with packages enumerated as dies. None of those systems
    supported HFI, though. If such a system emerged, it would need to
    be quirked.

Co-developed-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Link: https://patch.msgid.link/20240703055445.125362-1-rui.zhang@intel.com
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zhang Rui 2024-07-03 13:54:45 +08:00 committed by Rafael J. Wysocki
parent 55397323f3
commit b755367602
1 changed files with 17 additions and 13 deletions
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30
drivers/thermal/intel/intel_hfi.c
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@ -401,10 +401,10 @@ static void hfi_disable(void)
* intel_hfi_online() - Enable HFI on @cpu
* @cpu: CPU in which the HFI will be enabled
*
* Enable the HFI to be used in @cpu. The HFI is enabled at the die/package
* level. The first CPU in the die/package to come online does the full HFI
* Enable the HFI to be used in @cpu. The HFI is enabled at the package
* level. The first CPU in the package to come online does the full HFI
* initialization. Subsequent CPUs will just link themselves to the HFI
* instance of their die/package.
* instance of their package.
*
* This function is called before enabling the thermal vector in the local APIC
* in order to ensure that @cpu has an associated HFI instance when it receives
@ -414,31 +414,31 @@ void intel_hfi_online(unsigned int cpu)
{
struct hfi_instance *hfi_instance;
struct hfi_cpu_info *info;
u16 die_id;
u16 pkg_id;
/* Nothing to do if hfi_instances are missing. */
if (!hfi_instances)
return;
/*
* Link @cpu to the HFI instance of its package/die. It does not
* Link @cpu to the HFI instance of its package. It does not
* matter whether the instance has been initialized.
*/
info = &per_cpu(hfi_cpu_info, cpu);
die_id = topology_logical_die_id(cpu);
pkg_id = topology_logical_package_id(cpu);
hfi_instance = info->hfi_instance;
if (!hfi_instance) {
if (die_id >= max_hfi_instances)
if (pkg_id >= max_hfi_instances)
return;
hfi_instance = &hfi_instances[die_id];
hfi_instance = &hfi_instances[pkg_id];
info->hfi_instance = hfi_instance;
}
init_hfi_cpu_index(info);
/*
* Now check if the HFI instance of the package/die of @cpu has been
* Now check if the HFI instance of the package of @cpu has been
* initialized (by checking its header). In such case, all we have to
* do is to add @cpu to this instance's cpumask and enable the instance
* if needed.
@ -504,7 +504,7 @@ free_hw_table:
*
* On some processors, hardware remembers previous programming settings even
* after being reprogrammed. Thus, keep HFI enabled even if all CPUs in the
* die/package of @cpu are offline. See note in intel_hfi_online().
* package of @cpu are offline. See note in intel_hfi_online().
*/
void intel_hfi_offline(unsigned int cpu)
{
@ -674,9 +674,13 @@ void __init intel_hfi_init(void)
if (hfi_parse_features())
return;
/* There is one HFI instance per die/package. */
max_hfi_instances = topology_max_packages() *
topology_max_dies_per_package();
/*
* Note: HFI resources are managed at the physical package scope.
* There could be platforms that enumerate packages as Linux dies.
* Special handling would be needed if this happens on an HFI-capable
* platform.
*/
max_hfi_instances = topology_max_packages();
/*
* This allocation may fail. CPU hotplug callbacks must check