Re: [PATCH v2 04/13] PCI/ASPM: Move L0S/L1/sub states mask calculation into a helper

[Bjorn Helgaas]

On Mon, Sep 18, 2023 at 04:10:54PM +0300, Ilpo Järvinen wrote:
> ASPM service driver does the same L0S / L1S / sub states allowed
> calculation in __pci_disable_link_state() and
> pci_set_default_link_state().

Is there a typo or something here?  This patch only adds a call to
__pci_disable_link_state(), not to pci_set_default_link_state().

> Create a helper to calculate the mask for the allowed states.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
> ---
>  drivers/pci/pcie/aspm.c | 33 +++++++++++++++++++++------------
>  1 file changed, 21 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index ec6d7a092ac1..91dc95aca90f 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
> @@ -1034,6 +1034,26 @@ static struct pcie_link_state *pcie_aspm_get_link(struct pci_dev *pdev)
>  	return bridge->link_state;
>  }
>  
> +static u8 pci_link_state_mask(int state)
> +{
> +	u8 result = 0;
> +
> +	if (state & PCIE_LINK_STATE_L0S)
> +		result |= ASPM_STATE_L0S;
> +	if (state & PCIE_LINK_STATE_L1)
> +		result |= ASPM_STATE_L1;
> +	if (state & PCIE_LINK_STATE_L1_1)
> +		result |= ASPM_STATE_L1_1;
> +	if (state & PCIE_LINK_STATE_L1_2)
> +		result |= ASPM_STATE_L1_2;
> +	if (state & PCIE_LINK_STATE_L1_1_PCIPM)
> +		result |= ASPM_STATE_L1_1_PCIPM;
> +	if (state & PCIE_LINK_STATE_L1_2_PCIPM)
> +		result |= ASPM_STATE_L1_2_PCIPM;
> +
> +	return result;
> +}
> +
>  static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
>  {
>  	struct pcie_link_state *link = pcie_aspm_get_link(pdev);
> @@ -1063,18 +1083,7 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
>  	if (sem)
>  		down_read(&pci_bus_sem);
>  	mutex_lock(&aspm_lock);
> -	if (state & PCIE_LINK_STATE_L0S)
> -		link->aspm_disable |= ASPM_STATE_L0S;
> -	if (state & PCIE_LINK_STATE_L1)
> -		link->aspm_disable |= ASPM_STATE_L1;
> -	if (state & PCIE_LINK_STATE_L1_1)
> -		link->aspm_disable |= ASPM_STATE_L1_1;
> -	if (state & PCIE_LINK_STATE_L1_2)
> -		link->aspm_disable |= ASPM_STATE_L1_2;
> -	if (state & PCIE_LINK_STATE_L1_1_PCIPM)
> -		link->aspm_disable |= ASPM_STATE_L1_1_PCIPM;
> -	if (state & PCIE_LINK_STATE_L1_2_PCIPM)
> -		link->aspm_disable |= ASPM_STATE_L1_2_PCIPM;
> +	link->aspm_disable |= pci_link_state_mask(state);
>  	pcie_config_aspm_link(link, policy_to_aspm_state(link));
>  
>  	if (state & PCIE_LINK_STATE_CLKPM)
> -- 
> 2.30.2
> 
> 
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