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Date: Mon, 9 Aug 2021 13:14:18 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>
Cc: Mark Rutland <mark.rutland@....com>,
Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
Rafał Miłecki <zajec5@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
linux-pci@...r.kernel.org, Alexander Duyck <alexanderduyck@...com>,
Russell Currey <ruscur@...sell.cc>, x86@...nel.org,
oss-drivers@...igine.com, netdev@...r.kernel.org,
Paul Mackerras <paulus@...ba.org>,
"H. Peter Anvin" <hpa@...or.com>, Jiri Olsa <jolsa@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Taras Chornyi <tchornyi@...vell.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Herbert Xu <herbert@...dor.apana.org.au>,
linux-scsi@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
Sathya Prakash <sathya.prakash@...adcom.com>,
qat-linux@...el.com,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Ingo Molnar <mingo@...hat.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Jakub Kicinski <kuba@...nel.org>,
Yisen Zhuang <yisen.zhuang@...wei.com>,
Suganath Prabu Subramani
<suganath-prabu.subramani@...adcom.com>,
Fiona Trahe <fiona.trahe@...el.com>,
Oliver O'Halloran <oohall@...il.com>,
Andrew Donnellan <ajd@...ux.ibm.com>,
Mathias Nyman <mathias.nyman@...el.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Ido Schimmel <idosch@...dia.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Frederic Barrat <fbarrat@...ux.ibm.com>,
Borislav Petkov <bp@...en8.de>, Michael Buesch <m@...s.ch>,
Jiri Pirko <jiri@...dia.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Namhyung Kim <namhyung@...nel.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Andy Shevchenko <andriy.shevchenko@...el.com>,
Juergen Gross <jgross@...e.com>,
Salil Mehta <salil.mehta@...wei.com>,
Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
xen-devel@...ts.xenproject.org, Vadym Kochan <vkochan@...vell.com>,
MPT-FusionLinux.pdl@...adcom.com, linux-usb@...r.kernel.org,
linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org,
Zhou Wang <wangzhou1@...ilicon.com>,
Arnd Bergmann <arnd@...db.de>, linux-crypto@...r.kernel.org,
kernel@...gutronix.de,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Simon Horman <simon.horman@...igine.com>,
Wojciech Ziemba <wojciech.ziemba@...el.com>,
linuxppc-dev@...ts.ozlabs.org,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 0/6] PCI: Drop duplicated tracking of a pci_dev's
bound driver
On Sat, Aug 07, 2021 at 11:26:45AM +0200, Uwe Kleine-König wrote:
> On Fri, Aug 06, 2021 at 04:24:52PM -0500, Bjorn Helgaas wrote:
> > On Fri, Aug 06, 2021 at 08:46:23AM +0200, Uwe Kleine-König wrote:
> > > On Thu, Aug 05, 2021 at 06:42:34PM -0500, Bjorn Helgaas wrote:
> >
> > > > I looked at all the bus_type.probe() methods, it looks like pci_dev is
> > > > not the only offender here. At least the following also have a driver
> > > > pointer in the device struct:
> > > >
> > > > parisc_device.driver
> > > > acpi_device.driver
> > > > dio_dev.driver
> > > > hid_device.driver
> > > > pci_dev.driver
> > > > pnp_dev.driver
> > > > rio_dev.driver
> > > > zorro_dev.driver
> > >
> > > Right, when I converted zorro_dev it was pointed out that the code was
> > > copied from pci and the latter has the same construct. :-)
> > > See
> > > https://lore.kernel.org/r/20210730191035.1455248-5-u.kleine-koenig@pengutronix.de
> > > for the patch, I don't find where pci was pointed out, maybe it was on
> > > irc only.
> >
> > Oh, thanks! I looked to see if you'd done something similar
> > elsewhere, but I missed this one.
> >
> > > > Looking through the places that care about pci_dev.driver (the ones
> > > > updated by patch 5/6), many of them are ... a little dubious to begin
> > > > with. A few need the "struct pci_error_handlers *err_handler"
> > > > pointer, so that's probably legitimate. But many just need a name,
> > > > and should probably be using dev_driver_string() instead.
> > >
> > > Yeah, I considered adding a function to get the driver name from a
> > > pci_dev and a function to get the error handlers. Maybe it's an idea to
> > > introduce these two and then use to_pci_driver(pdev->dev.driver) for the
> > > few remaining users? Maybe doing that on top of my current series makes
> > > sense to have a clean switch from pdev->driver to pdev->dev.driver?!
> >
> > I'd propose using dev_driver_string() for these places:
> >
> > eeh_driver_name() (could change callers to use dev_driver_string())
> > bcma_host_pci_probe()
> > qm_alloc_uacce()
> > hns3_get_drvinfo()
> > prestera_pci_probe()
> > mlxsw_pci_probe()
> > nfp_get_drvinfo()
> > ssb_pcihost_probe()
>
> So the idea is:
>
> PCI: Simplify pci_device_remove()
> PCI: Drop useless check from pci_device_probe()
> xen/pci: Drop some checks that are always true
>
> are kept as is as preparation. (Do you want to take them from this v2,
> or should I include them again in v3?)
Easiest if you include them until we merge the series.
> Then convert the list of functions above to use dev_driver_string() in a
> 4th patch.
>
> > The use in mpt_device_driver_register() looks unnecessary: it's only
> > to get a struct pci_device_id *, which is passed to ->probe()
> > functions that don't need it.
>
> This is patch #5.
>
> > The use in adf_enable_aer() looks wrong: it sets the err_handler
> > pointer in one of the adf_driver structs. I think those structs
> > should be basically immutable, and the drivers that call
> > adf_enable_aer() from their .probe() methods should set
> > ".err_handler = &adf_err_handler" in their static adf_driver
> > definitions instead.
>
> I don't understand that one without some research, probably this yields
> at least one patch.
Yeah, it's a little messy because you'd have to make adf_err_handler
non-static and add an extern for it. Sample below.
> > I think that basically leaves these:
> >
> > uncore_pci_probe() # .id_table, custom driver "registration"
> > match_id() # .id_table, arch/x86/kernel/probe_roms.c
> > xhci_pci_quirks() # .id_table
> > pci_error_handlers() # roll-your-own AER handling, drivers/misc/cxl/guest.c
> >
> > I think it would be fine to use to_pci_driver(pdev->dev.driver) for
> > these few.
>
> Converting these will be patch 7 then and patch 8 can then drop the
> duplicated handling.
>
> Sounds reasonable?
Sounds good to me. Thanks for working on this!
Bjorn
diff --git a/drivers/crypto/qat/qat_4xxx/adf_drv.c b/drivers/crypto/qat/qat_4xxx/adf_drv.c
index a8805c815d16..75e6c5540523 100644
--- a/drivers/crypto/qat/qat_4xxx/adf_drv.c
+++ b/drivers/crypto/qat/qat_4xxx/adf_drv.c
@@ -310,6 +310,7 @@ static struct pci_driver adf_driver = {
.probe = adf_probe,
.remove = adf_remove,
.sriov_configure = adf_sriov_configure,
+ .err_handler = adf_err_handler,
};
module_pci_driver(adf_driver);
diff --git a/drivers/crypto/qat/qat_common/adf_aer.c b/drivers/crypto/qat/qat_common/adf_aer.c
index d2ae293d0df6..701c3c5f8b9b 100644
--- a/drivers/crypto/qat/qat_common/adf_aer.c
+++ b/drivers/crypto/qat/qat_common/adf_aer.c
@@ -166,7 +166,7 @@ static void adf_resume(struct pci_dev *pdev)
dev_info(&pdev->dev, "Device is up and running\n");
}
-static const struct pci_error_handlers adf_err_handler = {
+const struct pci_error_handlers adf_err_handler = {
.error_detected = adf_error_detected,
.slot_reset = adf_slot_reset,
.resume = adf_resume,
@@ -187,7 +187,6 @@ int adf_enable_aer(struct adf_accel_dev *accel_dev)
struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
struct pci_driver *pdrv = pdev->driver;
- pdrv->err_handler = &adf_err_handler;
pci_enable_pcie_error_reporting(pdev);
return 0;
}
diff --git a/drivers/crypto/qat/qat_common/adf_common_drv.h b/drivers/crypto/qat/qat_common/adf_common_drv.h
index c61476553728..98a29e0b8769 100644
--- a/drivers/crypto/qat/qat_common/adf_common_drv.h
+++ b/drivers/crypto/qat/qat_common/adf_common_drv.h
@@ -95,6 +95,7 @@ void adf_ae_fw_release(struct adf_accel_dev *accel_dev);
int adf_ae_start(struct adf_accel_dev *accel_dev);
int adf_ae_stop(struct adf_accel_dev *accel_dev);
+extern const struct pci_error_handlers adf_err_handler;
int adf_enable_aer(struct adf_accel_dev *accel_dev);
void adf_disable_aer(struct adf_accel_dev *accel_dev);
void adf_reset_sbr(struct adf_accel_dev *accel_dev);
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