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Re: [RFC PATCH 02/13] ALSA: hda: hda_intel: Use always-managed version of pcim_intx()
- To: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
- From: Philipp Stanner <pstanner@xxxxxxxxxx>
- Date: Fri, 11 Oct 2024 14:27:48 +0200
- Cc: Damien Le Moal <dlemoal@xxxxxxxxxx>, Niklas Cassel <cassel@xxxxxxxxxx>, Sergey Shtylyov <s.shtylyov@xxxxxx>, Basavaraj Natikar <basavaraj.natikar@xxxxxxx>, Jiri Kosina <jikos@xxxxxxxxxx>, Benjamin Tissoires <bentiss@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Alex Dubov <oakad@xxxxxxxxx>, Sudarsana Kalluru <skalluru@xxxxxxxxxxx>, Manish Chopra <manishc@xxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, Rasesh Mody <rmody@xxxxxxxxxxx>, GR-Linux-NIC-Dev@xxxxxxxxxxx, Igor Mitsyanko <imitsyanko@xxxxxxxxxxxxx>, Sergey Matyukevich <geomatsi@xxxxxxxxx>, Kalle Valo <kvalo@xxxxxxxxxx>, Sanjay R Mehta <sanju.mehta@xxxxxxx>, Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>, Jon Mason <jdmason@xxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, Allen Hubbe <allenbh@xxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Jaroslav Kysela <perex@xxxxxxxx>, Takashi Iwai <tiwai@xxxxxxxx>, Mario Limonciello <mario.limonciello@xxxxxxx>, Chen Ni <nichen@xxxxxxxxxxx>, Ricky Wu <ricky_wu@xxxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Breno Leitao <leitao@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>, Mostafa Saleh <smostafa@xxxxxxxxxx>, Hannes Reinecke <hare@xxxxxxx>, John Garry <john.g.garry@xxxxxxxxxx>, Soumya Negi <soumya.negi97@xxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Yi Liu <yi.l.liu@xxxxxxxxx>, "Dr. David Alan Gilbert" <linux@xxxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Ankit Agrawal <ankita@xxxxxxxxxx>, Reinette Chatre <reinette.chatre@xxxxxxxxx>, Eric Auger <eric.auger@xxxxxxxxxx>, Ye Bin <yebin10@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxx>, Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>, Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>, Peter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>, Rui Salvaterra <rsalvaterra@xxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, linux-ide@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-input@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-wireless@xxxxxxxxxxxxxxx, ntb@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-staging@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-sound@xxxxxxxxxxxxxxx
- Delivery-date: Fri, 11 Oct 2024 12:28:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, 2024-10-10 at 17:46 +0300, Andy Shevchenko wrote:
> On Wed, Oct 09, 2024 at 10:35:08AM +0200, Philipp Stanner wrote:
> > pci_intx() is a hybrid function which can sometimes be managed
> > through
> > devres. To remove this hybrid nature from pci_intx(), it is
> > necessary to
> > port users to either an always-managed or a never-managed version.
> >
> > hda_intel enables its PCI-Device with pcim_enable_device(). Thus,
> > it needs
> > the always-managed version.
> >
> > Replace pci_intx() with pcim_intx().
>
> ...
>
> > bus->irq = chip->pci->irq;
> > chip->card->sync_irq = bus->irq;
> > - pci_intx(chip->pci, !chip->msi);
> > + pcim_intx(chip->pci, !chip->msi);
> > return 0;
>
> I believe each driver needs an individual approach. Looking at the
> above
> I would first to understand why this one is being used and why we
> can't
> switch to pci{m}_alloc_irq_vectors(). (Yeah, managed
> pci_alloc_irq_vectors()
> is probably still missing, I don't remember if you introduced it or
> not.
>
Alright alright – we touched it in the other mail briefly, but let me
point out another specific problem:
pci_alloc_irq_vectors() *uses* pci_intx(). And pci_intx() can be
managed sometimes.
See the problem? :(
So it's not just that I couldn't port the driver Alex is concerned
about, it's also that MSI itself is a user of pci_intx().
So a pcim_alloc_irq_vectors() might end up doing double-devres or God
knows what else. Only once pci_intx() is clean one can start thinking
about the code in pci/msi/
It's the biggest reason why I want to clean it up as suggested here,
and also why the only patch I'm really nervous about is number 8.
P.
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