linux-kernel - Re: [PATCH] platform/x86: ISST: Remove 8 socket limit

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Message-ID: <bf9a2943-f4eb-eb24-e18b-1b1c1959fe31@linux.intel.com>
Date:   Tue, 23 May 2023 12:27:08 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Steve Wahl <steve.wahl@....com>
cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: ISST: Remove 8 socket limit

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@....com>
> ---
>  .../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@...ux.intel.com>

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.