On Fri, 19 May 2023, Steve Wahl wrote:
> Stop restricting the PCI search to a range of PCI domains fed to
> pci_get_domain_bus_and_slot(). Instead, use for_each_pci_dev() and
> look at all PCI domains in one pass.
>
> On systems with more than 8 sockets, this avoids error messages like
> "Information: Invalid level, Can't get TDP control information at
> specified levels on cpu 480" from the intel speed select utility.
>
> Fixes: aa2ddd242572 ("platform/x86: ISST: Use numa node id for cpu pci dev mapping")
> Signed-off-by: Steve Wahl <steve.wahl@xxxxxxx>
> ---
> .../x86/intel/speed_select_if/isst_if_common.c | 12 +++++-------
> 1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/platform/x86/intel/speed_select_if/isst_if_common.c b/drivers/platform/x86/intel/speed_select_if/isst_if_common.c
> index e0572a29212e..02fe360a59c7 100644
> --- a/drivers/platform/x86/intel/speed_select_if/isst_if_common.c
> +++ b/drivers/platform/x86/intel/speed_select_if/isst_if_common.c
> @@ -304,14 +304,13 @@ struct isst_if_pkg_info {
> static struct isst_if_cpu_info *isst_cpu_info;
> static struct isst_if_pkg_info *isst_pkg_info;
>
> -#define ISST_MAX_PCI_DOMAINS 8
> -
> static struct pci_dev *_isst_if_get_pci_dev(int cpu, int bus_no, int dev, int fn)
> {
> struct pci_dev *matched_pci_dev = NULL;
> struct pci_dev *pci_dev = NULL;
> + struct pci_dev *_pci_dev = NULL;
> int no_matches = 0, pkg_id;
> - int i, bus_number;
> + int bus_number;
>
> if (bus_no < 0 || bus_no >= ISST_MAX_BUS_NUMBER || cpu < 0 ||
> cpu >= nr_cpu_ids || cpu >= num_possible_cpus())
> @@ -323,12 +322,11 @@ static struct pci_dev *_isst_if_get_pci_dev(int cpu, int bus_no, int dev, int fn
> if (bus_number < 0)
> return NULL;
>
> - for (i = 0; i < ISST_MAX_PCI_DOMAINS; ++i) {
> - struct pci_dev *_pci_dev;
> + for_each_pci_dev(_pci_dev) {
> int node;
>
> - _pci_dev = pci_get_domain_bus_and_slot(i, bus_number, PCI_DEVFN(dev, fn));
> - if (!_pci_dev)
> + if (_pci_dev->bus->number != bus_number ||
> + _pci_dev->devfn != PCI_DEVFN(dev, fn))
> continue;
>
> ++no_matches;
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
With the note that _pci_dev is not a good variable name (but the rename
would make this fix larger than it needs to be).
--
i.
