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SubjectRe: [PATCH 11/11] hwmon/coretemp: Support multi-die/package
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On 2/18/19 7:40 PM, Len Brown wrote:
> From: Zhang Rui <rui.zhang@intel.com>
>
> This patch introduces coretemp driver support
> for new dual-die/package systems.
>
> On the new dual-die/package systems, the package temperature MSRs becomes
> die-scope. Thus instead of one hwmon device per physical package, now
> there should be one hwmon device for each die on these systems.
>
> On the hardwares that do not have multi-die support,
> topology_unique_die_id() equals topology_physical_package_id(), thus the
> only difference is that physical package id is used as the coretemp
> platform device id, instead of logical package id on these systems.
>
> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> Signed-off-by: Len Brown <len.brown@intel.com>
> Cc: linux-pm@vger.kernel.org
> Cc: linux-hwmon@vger.kernel.org
> Signed-off-by: Len Brown <len.brown@intel.com>

Acked-by: Guenter Roeck <linux@roeck-us.net>

> ---
> drivers/hwmon/coretemp.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index 5d34f7271e67..a0b6b2247c3a 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -435,7 +435,7 @@ static int chk_ucode_version(unsigned int cpu)
>
> static struct platform_device *coretemp_get_pdev(unsigned int cpu)
> {
> - int pkgid = topology_logical_package_id(cpu);
> + int pkgid = topology_unique_die_id(cpu);
>
> if (pkgid >= 0 && pkgid < max_packages)
> return pkg_devices[pkgid];
> @@ -579,7 +579,7 @@ static struct platform_driver coretemp_driver = {
>
> static struct platform_device *coretemp_device_add(unsigned int cpu)
> {
> - int err, pkgid = topology_logical_package_id(cpu);
> + int err, pkgid = topology_unique_die_id(cpu);
> struct platform_device *pdev;
>
> if (pkgid < 0)
> @@ -703,7 +703,7 @@ static int coretemp_cpu_offline(unsigned int cpu)
> * the rest.
> */
> if (cpumask_empty(&pd->cpumask)) {
> - pkg_devices[topology_logical_package_id(cpu)] = NULL;
> + pkg_devices[topology_unique_die_id(cpu)] = NULL;
> platform_device_unregister(pdev);
> return 0;
> }
> @@ -732,6 +732,7 @@ static enum cpuhp_state coretemp_hp_online;
> static int __init coretemp_init(void)
> {
> int err;
> + struct cpuinfo_x86 *c = &cpu_data(0);
>
> /*
> * CPUID.06H.EAX[0] indicates whether the CPU has thermal
> @@ -741,7 +742,7 @@ static int __init coretemp_init(void)
> if (!x86_match_cpu(coretemp_ids))
> return -ENODEV;
>
> - max_packages = topology_max_packages();
> + max_packages = topology_max_packages() * c->x86_max_dies;
> pkg_devices = kcalloc(max_packages, sizeof(struct platform_device *),
> GFP_KERNEL);
> if (!pkg_devices)
>

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