linux-kernel - RE: [PATCH v5 8/9] PCI: Define scoped based management functions

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Date: Wed, 3 Jan 2024 14:38:57 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>, Ira Weiny <ira.weiny@...el.com>, "Dan
 Williams" <dan.j.williams@...el.com>, Jonathan Cameron
	<jonathan.cameron@...wei.com>, Smita Koralahalli
	<Smita.KoralahalliChannabasappa@....com>, Shiju Jose <shiju.jose@...wei.com>
CC: Yazen Ghannam <yazen.ghannam@....com>, Davidlohr Bueso
	<dave@...olabs.net>, Dave Jiang <dave.jiang@...el.com>, Alison Schofield
	<alison.schofield@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, "Ard
 Biesheuvel" <ardb@...nel.org>, <linux-efi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>, Ira Weiny
	<ira.weiny@...el.com>, <linux-pci@...r.kernel.org>
Subject: RE: [PATCH v5 8/9] PCI: Define scoped based management functions

[ add linux-pci ]

Ira Weiny wrote:
> Users of pci_dev_get() can benefit from a scoped based put.  Also,
> locking a PCI device is often done within a single scope.
> 
> Define a pci_dev_put() free function and a PCI device lock guard.  These
> will initially be used in new CXL event processing code but is defined
> in a separate patch for others to pickup and use/backport easier.

Hi Bjorn,

Any heartburn if I take this through cxl.git with the rest in this
series? Patch 9 has a dependency on this one.

> 
> Cc: Bjorn Helgaas      <bhelgaas@...gle.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
> ---
> Changes for v5:
> [Jonathan: New patch]
> ---
>  include/linux/pci.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 60ca768bc867..290d0a2651b2 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1170,6 +1170,7 @@ int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);
>  u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp);
>  struct pci_dev *pci_dev_get(struct pci_dev *dev);
>  void pci_dev_put(struct pci_dev *dev);
> +DEFINE_FREE(pci_dev_put, struct pci_dev *, if (_T) pci_dev_put(_T))
>  void pci_remove_bus(struct pci_bus *b);
>  void pci_stop_and_remove_bus_device(struct pci_dev *dev);
>  void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev);
> @@ -1871,6 +1872,7 @@ void pci_cfg_access_unlock(struct pci_dev *dev);
>  void pci_dev_lock(struct pci_dev *dev);
>  int pci_dev_trylock(struct pci_dev *dev);
>  void pci_dev_unlock(struct pci_dev *dev);
> +DEFINE_GUARD(pci_dev, struct pci_dev *, pci_dev_lock(_T), pci_dev_unlock(_T))
>  
>  /*
>   * PCI domain support.  Sometimes called PCI segment (eg by ACPI),
> 
> -- 
> 2.43.0
>