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Message-ID: <8e2ef99f-1a3d-44b6-9b3d-c612e43a33c4@gmail.com>
Date: Wed, 6 Mar 2024 07:46:21 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>,
Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
horms@...nel.org, Alan Brady <alan.brady@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
linux-pci@...r.kernel.org
Subject: Re: [PATCH iwl-next v2 1/2] igb: simplify pci ops declaration
On 06.03.2024 07:24, Paul Menzel wrote:
> [Cc: +linux-pci@...r.kernel.org]
>
>
> Dear Jesse,
>
>
> Am 06.03.24 um 03:50 schrieb Jesse Brandeburg:
>> The igb driver was pre-declaring tons of functions just so that it could
>> have an early declaration of the pci_driver struct.
>>
>> Delete a bunch of the declarations and move the struct to the bottom of the
>> file, after all the functions are declared.
>>
>> Reviewed-by: Alan Brady <alan.brady@...el.com>
>> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
>> ---
>> v2: address compilation failure when CONFIG_PM=n, which is then updated
>> in patch 2/2, fix alignment.
>> changes in v1 reviewed by Simon Horman
>> changes in v1 reviewed by Paul Menzel
>> v1: original net-next posting
>> ---
>> drivers/net/ethernet/intel/igb/igb_main.c | 53 ++++++++++-------------
>> 1 file changed, 24 insertions(+), 29 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
>> index 518298bbdadc..e749bf5164b8 100644
>> --- a/drivers/net/ethernet/intel/igb/igb_main.c
>> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
>> @@ -106,8 +106,6 @@ static int igb_setup_all_rx_resources(struct igb_adapter *);
>> static void igb_free_all_tx_resources(struct igb_adapter *);
>> static void igb_free_all_rx_resources(struct igb_adapter *);
>> static void igb_setup_mrqc(struct igb_adapter *);
>> -static int igb_probe(struct pci_dev *, const struct pci_device_id *);
>> -static void igb_remove(struct pci_dev *pdev);
>> static void igb_init_queue_configuration(struct igb_adapter *adapter);
>> static int igb_sw_init(struct igb_adapter *);
>> int igb_open(struct net_device *);
>> @@ -178,20 +176,6 @@ static int igb_vf_configure(struct igb_adapter *adapter, int vf);
>> static int igb_disable_sriov(struct pci_dev *dev, bool reinit);
>> #endif
>> -static int igb_suspend(struct device *);
>> -static int igb_resume(struct device *);
>> -static int igb_runtime_suspend(struct device *dev);
>> -static int igb_runtime_resume(struct device *dev);
>> -static int igb_runtime_idle(struct device *dev);
>> -#ifdef CONFIG_PM
>> -static const struct dev_pm_ops igb_pm_ops = {
>> - SET_SYSTEM_SLEEP_PM_OPS(igb_suspend, igb_resume)
>> - SET_RUNTIME_PM_OPS(igb_runtime_suspend, igb_runtime_resume,
>> - igb_runtime_idle)
>> -};
>> -#endif
>> -static void igb_shutdown(struct pci_dev *);
>> -static int igb_pci_sriov_configure(struct pci_dev *dev, int num_vfs);
>> #ifdef CONFIG_IGB_DCA
>> static int igb_notify_dca(struct notifier_block *, unsigned long, void *);
>> static struct notifier_block dca_notifier = {
>> @@ -219,19 +203,6 @@ static const struct pci_error_handlers igb_err_handler = {
>> static void igb_init_dmac(struct igb_adapter *adapter, u32 pba);
>> -static struct pci_driver igb_driver = {
>> - .name = igb_driver_name,
>> - .id_table = igb_pci_tbl,
>> - .probe = igb_probe,
>> - .remove = igb_remove,
>> -#ifdef CONFIG_PM
>> - .driver.pm = &igb_pm_ops,
>> -#endif
>> - .shutdown = igb_shutdown,
>> - .sriov_configure = igb_pci_sriov_configure,
>> - .err_handler = &igb_err_handler
>> -};
>> -
>> MODULE_AUTHOR("Intel Corporation, <e1000-devel@...ts.sourceforge.net>");
>> MODULE_DESCRIPTION("Intel(R) Gigabit Ethernet Network Driver");
>> MODULE_LICENSE("GPL v2");
>
> A lot of other drivers also have this at the end.
>
>> @@ -647,6 +618,8 @@ struct net_device *igb_get_hw_dev(struct e1000_hw *hw)
>> return adapter->netdev;
>> }
>> +static struct pci_driver igb_driver;
>> +
>> /**
>> * igb_init_module - Driver Registration Routine
>> *
>> @@ -10170,4 +10143,26 @@ static void igb_nfc_filter_restore(struct igb_adapter *adapter)
>> spin_unlock(&adapter->nfc_lock);
>> }
>> +
>> +#ifdef CONFIG_PM
>> +static const struct dev_pm_ops igb_pm_ops = {
>> + SET_SYSTEM_SLEEP_PM_OPS(igb_suspend, igb_resume)
>> + SET_RUNTIME_PM_OPS(igb_runtime_suspend, igb_runtime_resume,
>> + igb_runtime_idle)
>> +};
>> +#endif
>> +
>> +static struct pci_driver igb_driver = {
>> + .name = igb_driver_name,
>> + .id_table = igb_pci_tbl,
>> + .probe = igb_probe,
>> + .remove = igb_remove,
>> +#ifdef CONFIG_PM
>> + .driver.pm = &igb_pm_ops,
>> +#endif
>> + .shutdown = igb_shutdown,
>> + .sriov_configure = igb_pci_sriov_configure,
>> + .err_handler = &igb_err_handler
>> +};
>> +
>> /* igb_main.c */
>
> I looked through `drivers/` and .driver.pm is unguarded there. Example `drivers/video/fbdev/geode/gxfb_core.c`:
>
> static const struct dev_pm_ops gxfb_pm_ops = {
> #ifdef CONFIG_PM_SLEEP
> .suspend = gxfb_suspend,
> .resume = gxfb_resume,
> .freeze = NULL,
> .thaw = gxfb_resume,
> .poweroff = NULL,
> .restore = gxfb_resume,
> #endif
> };
>
> static struct pci_driver gxfb_driver = {
> .name = "gxfb",
> .id_table = gxfb_id_table,
> .probe = gxfb_probe,
> .remove = gxfb_remove,
> .driver.pm = &gxfb_pm_ops,
> };
>
> No idea, what driver follows the best practices though, and if it would belong into a separate commit.
>
The geode fbdev driver may be a bad example as it's ancient.
There's pm_sleep_ptr, SYSTEM_SLEEP_PM_OPS et al to avoid the conditional
compiling and use of __maybe_unused. And yes, I also think this should be
a separate patch.
>
> Kind regards,
>
> Paul
>
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