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Message-ID: <c12899f6-bb77-f8cb-3d36-30a65a169e97@linux.intel.com>
Date: Fri, 25 Oct 2024 19:29:22 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Philipp Stanner <pstanner@...hat.com>
cc: Jonathan Corbet <corbet@....net>, Damien Le Moal <dlemoal@...nel.org>,
Niklas Cassel <cassel@...nel.org>,
Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Boris Brezillon <bbrezillon@...nel.org>,
Arnaud Ebalard <arno@...isbad.org>, Srujana Challa <schalla@...vell.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Miri Korenblit <miriam.rachel.korenblit@...el.com>,
Kalle Valo <kvalo@...nel.org>, Serge Semin <fancer.lancer@...il.com>,
Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
Allen Hubbe <allenbh@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
Kevin Cernekee <cernekee@...il.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
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Jie Wang <jie.wang@...el.com>, Tero Kristo <tero.kristo@...ux.intel.com>,
Adam Guerin <adam.guerin@...el.com>,
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Przemek Kitszel <przemyslaw.kitszel@...el.com>,
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Nithin Dabilpuram <ndabilpuram@...vell.com>,
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linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
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ntb@...ts.linux.dev, linux-pci@...r.kernel.org,
linux-serial <linux-serial@...r.kernel.org>, linux-sound@...r.kernel.org
Subject: Re: [PATCH 06/10] wifi: iwlwifi: replace deprecated PCI functions
On Fri, 25 Oct 2024, Philipp Stanner wrote:
> On Fri, 2024-10-25 at 19:11 +0300, Ilpo Järvinen wrote:
> > On Fri, 25 Oct 2024, Philipp Stanner wrote:
> >
> > > On Fri, 2024-10-25 at 18:31 +0300, Ilpo Järvinen wrote:
> > > > On Fri, 25 Oct 2024, Philipp Stanner wrote:
> > > >
> > > > > pcim_iomap_table() and pcim_iomap_regions_request_all() have
> > > > > been
> > > > > deprecated by the PCI subsystem in commit e354bb84a4c1 ("PCI:
> > > > > Deprecate
> > > > > pcim_iomap_table(), pcim_iomap_regions_request_all()").
> > > > >
> > > > > Replace these functions with their successors, pcim_iomap() and
> > > > > pcim_request_all_regions().
> > > > >
> > > > > Signed-off-by: Philipp Stanner <pstanner@...hat.com>
> > > > > Acked-by: Kalle Valo <kvalo@...nel.org>
> > > > > ---
> > > > > drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 16 ++++-----
> > > > > ----
> > > > > ---
> > > > > 1 file changed, 4 insertions(+), 12 deletions(-)
> > > > >
> > > > > diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
> > > > > b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
> > > > > index 3b9943eb6934..4b41613ad89d 100644
> > > > > --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
> > > > > +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
> > > > > @@ -3533,7 +3533,6 @@ struct iwl_trans
> > > > > *iwl_trans_pcie_alloc(struct
> > > > > pci_dev *pdev,
> > > > > struct iwl_trans_pcie *trans_pcie, **priv;
> > > > > struct iwl_trans *trans;
> > > > > int ret, addr_size;
> > > > > - void __iomem * const *table;
> > > > > u32 bar0;
> > > > >
> > > > > /* reassign our BAR 0 if invalid due to possible
> > > > > runtime
> > > > > PM races */
> > > > > @@ -3659,22 +3658,15 @@ struct iwl_trans
> > > > > *iwl_trans_pcie_alloc(struct pci_dev *pdev,
> > > > > }
> > > > > }
> > > > >
> > > > > - ret = pcim_iomap_regions_request_all(pdev, BIT(0),
> > > > > DRV_NAME);
> > > > > + ret = pcim_request_all_regions(pdev, DRV_NAME);
> > > > > if (ret) {
> > > > > - dev_err(&pdev->dev,
> > > > > "pcim_iomap_regions_request_all failed\n");
> > > > > + dev_err(&pdev->dev, "pcim_request_all_regions
> > > > > failed\n");
> > > > > goto out_no_pci;
> > > > > }
> > > > >
> > > > > - table = pcim_iomap_table(pdev);
> > > > > - if (!table) {
> > > > > - dev_err(&pdev->dev, "pcim_iomap_table
> > > > > failed\n");
> > > > > - ret = -ENOMEM;
> > > > > - goto out_no_pci;
> > > > > - }
> > > > > -
> > > > > - trans_pcie->hw_base = table[0];
> > > > > + trans_pcie->hw_base = pcim_iomap(pdev, 0, 0);
> > > > > if (!trans_pcie->hw_base) {
> > > > > - dev_err(&pdev->dev, "couldn't find IO mem in
> > > > > first
> > > > > BAR\n");
> > > > > + dev_err(&pdev->dev, "pcim_iomap failed\n");
> > > >
> > > > This seems a step backwards as a human readable English error
> > > > message
> > > > was
> > > > replaced with a reference to a function name.
> > >
> > > I think it's still an improvement because "couldn't find IO mem in
> > > first BAR" is a nonsensical statement. What the author probably
> > > meant
> > > was: "Couldn't find first BAR's IO mem in magic pci_iomap_table" ;)
> >
> > Well, that's just spelling things on a too low level too. It's
> > irrelevant
> > detail to the _user_ that kernel used some "magic table". Similarly,
> > it's
> > irrelevant to the user that function called pcim_iomap failed.
> >
> > > The reason I just wrote "pcim_iomap failed\n" is that this seems to
> > > be
> > > this driver's style for those messages. See the dev_err() above,
> > > there
> > > they also just state that this or that function failed.
> >
> > The problem in using function names is they have obvious meaning for
> > developers/coders but dev_err() is presented to user with varying
> > level
> > of knowledge about kernel internals/code.
> >
> > While users might be able to derive some information from the
> > function
> > name, it would be simply better to explain on higher level what
> > failed
> > which is what I think the original message tried to do even if it was
> > a bit clumsy. There is zero need to know about kernel internals to
> > interpret that message (arguably one needs to know some PCI to
> > understand
> > BAR, though).
> >
> > (Developers can find the internals by looking up the error message
> > from
> > the code so it doesn't take away something from developers.)
>
> Feel free to make a suggestion for a better error message.
>
> sth like "could not ioremap PCI BAR 0.\n" could satisfy your criteria.
Yes.
--
i.
> (I just now noticed that so far it called BAR 0 the "first bar", which
> is also not gold standard)
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