lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <fc7244823a5665d3db40c94aea099a2973032a0b.camel@redhat.com>
Date: Wed, 16 Oct 2024 08:57:58 +0200
From: Philipp Stanner <pstanner@...hat.com>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: Damien Le Moal <dlemoal@...nel.org>, Niklas Cassel <cassel@...nel.org>, 
 Sergey Shtylyov <s.shtylyov@....ru>, Basavaraj Natikar
 <basavaraj.natikar@....com>, Jiri Kosina <jikos@...nel.org>,  Benjamin
 Tissoires <bentiss@...nel.org>, Arnd Bergmann <arnd@...db.de>, Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>, Alex Dubov <oakad@...oo.com>,
 Sudarsana Kalluru <skalluru@...vell.com>, Manish Chopra
 <manishc@...vell.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>, Rasesh Mody <rmody@...vell.com>,
 GR-Linux-NIC-Dev@...vell.com, Igor Mitsyanko <imitsyanko@...ntenna.com>,
 Sergey Matyukevich <geomatsi@...il.com>, Kalle Valo <kvalo@...nel.org>,
 Sanjay R Mehta <sanju.mehta@....com>, Shyam Sundar S K
 <Shyam-sundar.S-k@....com>, Jon Mason <jdmason@...zu.us>, Dave Jiang
 <dave.jiang@...el.com>, Allen Hubbe <allenbh@...il.com>, Bjorn Helgaas
 <bhelgaas@...gle.com>, Juergen Gross <jgross@...e.com>, Stefano Stabellini
 <sstabellini@...nel.org>, Oleksandr Tyshchenko
 <oleksandr_tyshchenko@...m.com>,  Jaroslav Kysela <perex@...ex.cz>, Takashi
 Iwai <tiwai@...e.com>, Chen Ni <nichen@...as.ac.cn>,  Mario Limonciello
 <mario.limonciello@....com>, Ricky Wu <ricky_wu@...ltek.com>, Al Viro
 <viro@...iv.linux.org.uk>,  Breno Leitao <leitao@...ian.org>, Kevin Tian
 <kevin.tian@...el.com>, Thomas Gleixner <tglx@...utronix.de>,  Ilpo
 Järvinen <ilpo.jarvinen@...ux.intel.com>, Andy
 Shevchenko <andriy.shevchenko@...ux.intel.com>, Mostafa Saleh
 <smostafa@...gle.com>,  Jason Gunthorpe <jgg@...pe.ca>, Yi Liu
 <yi.l.liu@...el.com>, Christian Brauner <brauner@...nel.org>, Ankit Agrawal
 <ankita@...dia.com>, Eric Auger <eric.auger@...hat.com>, Reinette Chatre
 <reinette.chatre@...el.com>, Ye Bin <yebin10@...wei.com>, Marek
 Marczykowski-Górecki <marmarek@...isiblethingslab.com>,
 Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>, Peter Ujfalusi
 <peter.ujfalusi@...ux.intel.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Kai Vehmanen
 <kai.vehmanen@...ux.intel.com>,  Rui Salvaterra <rsalvaterra@...il.com>,
 linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-input@...r.kernel.org, netdev@...r.kernel.org, 
 linux-wireless@...r.kernel.org, ntb@...ts.linux.dev,
 linux-pci@...r.kernel.org,  kvm@...r.kernel.org,
 xen-devel@...ts.xenproject.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH 13/13] PCI: Deprecate pci_intx(), pcim_intx()

On Tue, 2024-10-15 at 13:53 -0600, Alex Williamson wrote:
> On Tue, 15 Oct 2024 20:51:23 +0200
> Philipp Stanner <pstanner@...hat.com> wrote:
> 
> > pci_intx() and its managed counterpart pcim_intx() only exist for
> > older
> > drivers which have not been ported yet for various reasons. Future
> > drivers should preferably use pci_alloc_irq_vectors().
> > 
> > Mark pci_intx() and pcim_intx() as deprecated and encourage usage
> > of
> > pci_alloc_irq_vectors() in its place.
> 
> I don't really understand this.  As we've discussed previously
> pci_alloc_irq_vectors() is, unsurprisingly, for allocating PCI IRQ
> vectors while pci_intx() is for manipulating the INTx disable bit on
> PCI devices.  The latter is a generic mechanism for preventing PCI
> devices from generating INTx, regardless of whether there's a vector
> allocated for it.  How does the former replace the latter and why do
> we
> feel the need to deprecate the latter?
> 
> It feels like this fits some narrow narrative and makes all users of
> these now deprecated functions second class citizens.  Why?  At it's
> root these are simply providing mask and set or mask and clear
> register
> bit operations.  Thanks,

I got the feeling from the RFC discussion that that was basically the
consensus: people should use pci_alloc_irq_vectors(). Or did I
misunderstand Andy and Heiner?

I'm perfectly happy with dropping this patch and continue offering
pci{m}_intx() to users, since after removing that hybrid hazzard I
don't see any harm in them anymore.


P.

> 
> Alex
>  
> > Signed-off-by: Philipp Stanner <pstanner@...hat.com>
> > ---
> >  drivers/pci/devres.c | 5 ++++-
> >  drivers/pci/pci.c    | 5 ++++-
> >  2 files changed, 8 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
> > index 6f8f712fe34e..4c76fc063104 100644
> > --- a/drivers/pci/devres.c
> > +++ b/drivers/pci/devres.c
> > @@ -435,7 +435,7 @@ static struct pcim_intx_devres
> > *get_or_create_intx_devres(struct device *dev)
> >  }
> >  
> >  /**
> > - * pcim_intx - managed pci_intx()
> > + * pcim_intx - managed pci_intx() (DEPRECATED)
> >   * @pdev: the PCI device to operate on
> >   * @enable: boolean: whether to enable or disable PCI INTx
> >   *
> > @@ -443,6 +443,9 @@ static struct pcim_intx_devres
> > *get_or_create_intx_devres(struct device *dev)
> >   *
> >   * Enable/disable PCI INTx for device @pdev.
> >   * Restore the original state on driver detach.
> > + *
> > + * This function is DEPRECATED. Do not use it in new code.
> > + * Use pci_alloc_irq_vectors() instead (there is no managed
> > version, currently).
> >   */
> >  int pcim_intx(struct pci_dev *pdev, int enable)
> >  {
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index 7ce1d0e3a1d5..dc69e23b8982 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -4477,11 +4477,14 @@ void pci_disable_parity(struct pci_dev
> > *dev)
> >  }
> >  
> >  /**
> > - * pci_intx - enables/disables PCI INTx for device dev
> > + * pci_intx - enables/disables PCI INTx for device dev
> > (DEPRECATED)
> >   * @pdev: the PCI device to operate on
> >   * @enable: boolean: whether to enable or disable PCI INTx
> >   *
> >   * Enables/disables PCI INTx for device @pdev
> > + *
> > + * This function is DEPRECATED. Do not use it in new code.
> > + * Use pci_alloc_irq_vectors() instead.
> >   */
> >  void pci_intx(struct pci_dev *pdev, int enable)
> >  {
> 


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ