Re: [Intel-gfx] [PATCH i-g-t v2 1/3] lib/igt_pm: Refactor get firmware_node fd

From: "Gupta, Anshuman" <anshuman.gupta@intel.com>
To: "Vivi, Rodrigo" <rodrigo.vivi@intel.com>
Cc: "intel-gfx@lists.freedesktop.org" <intel-gfx@lists.freedesktop.org>
Subject: Re: [Intel-gfx] [PATCH i-g-t v2 1/3] lib/igt_pm: Refactor get firmware_node fd
Date: Tue, 15 Nov 2022 04:37:57 +0000	[thread overview]
Message-ID: <CY5PR11MB621138264D1BCE8637A6287695049@CY5PR11MB6211.namprd11.prod.outlook.com> (raw)
In-Reply-To: <Y3KdnF8AOHHICiXG@intel.com>


> -----Original Message-----
> From: Vivi, Rodrigo <rodrigo.vivi@intel.com>
> Sent: Tuesday, November 15, 2022 1:27 AM
> To: Gupta, Anshuman <anshuman.gupta@intel.com>
> Cc: intel-gfx@lists.freedesktop.org; kamil.konieczny@linux.intel.com;
> Tangudu, Tilak <tilak.tangudu@intel.com>; Nilawar, Badal
> <badal.nilawar@intel.com>
> Subject: Re: [PATCH i-g-t v2 1/3] lib/igt_pm: Refactor get firmware_node fd
> 
> On Mon, Nov 14, 2022 at 06:08:41PM +0530, Anshuman Gupta wrote:
> > Created igt_pm_open_pci_firmware_node() to refactor the retrieving the
> > firmware_node fd code.
> >
> > igt_pm_open_pci_firmware_node() will be used by other firmware_node
> > consumers.
> >
> > While doing that fixed the leaked fd as well.
> >
> > v2:
> > - return false instead of igt_require on no firmware_node_fd. [Kamil]
> > - use igt_assert() when failed to open 'real_power_state' on error
> >   other then ENONET.
> >
> > Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
> > ---
> >  lib/igt_pm.c | 36 +++++++++++++++++++++++++-----------
> 
> I believe we need a massive refactor in this lib... we have 2 different ways of
> using stuff, plus that ugly global restore...
> 
> but anyway, this one here looks a good change regardless of the current
> mess in the lib.
> 
> 
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Thanks Rodrigo for RB, 
my bad I sent these patches on kernel mailing list instead of igt-dev.
I will keep your RB and re-float the patches to igt-dev.
Thanks,
Anshuman Gupta.
> 
> 
> >  1 file changed, 25 insertions(+), 11 deletions(-)
> >
> > diff --git a/lib/igt_pm.c b/lib/igt_pm.c index 1e6e9ed3f..4f0cfbdd1
> > 100644
> > --- a/lib/igt_pm.c
> > +++ b/lib/igt_pm.c
> > @@ -863,6 +863,20 @@ bool i915_output_is_lpsp_capable(int drm_fd,
> igt_output_t *output)
> >  	return strstr(buf, "LPSP: capable");  }
> >
> > +static int igt_pm_open_pci_firmware_node(struct pci_device *pci_dev)
> > +{
> > +	char name[PATH_MAX];
> > +	int dir;
> > +
> > +	snprintf(name, PATH_MAX,
> > +
> "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/firmware_node",
> > +		 pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev-
> >func);
> > +
> > +	dir = open(name, O_RDONLY);
> > +
> > +	return dir;
> > +}
> > +
> >  /**
> >   * igt_pm_acpi_d3cold_supported:
> >   * @pci_dev: root port pci_dev.
> > @@ -873,23 +887,23 @@ bool i915_output_is_lpsp_capable(int drm_fd,
> igt_output_t *output)
> >   */
> >  bool igt_pm_acpi_d3cold_supported(struct pci_device *pci_dev)  {
> > -	char name[PATH_MAX];
> > -	int dir, fd;
> > -
> > -	snprintf(name, PATH_MAX,
> > -
> "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/firmware_node",
> > -		 pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev-
> >func);
> > +	int firmware_node_fd, fd;
> >
> > -	dir = open(name, O_RDONLY);
> > -	igt_require(dir > 0);
> > +	firmware_node_fd = igt_pm_open_pci_firmware_node(pci_dev);
> > +	if (firmware_node_fd < 0)
> > +		return false;
> >
> >  	/* BIOS need to enable ACPI D3Cold Support.*/
> > -	fd = openat(dir, "real_power_state", O_RDONLY);
> > -	if (fd < 0 && errno == ENOENT)
> > +	fd = openat(firmware_node_fd, "real_power_state", O_RDONLY);
> > +	if (fd < 0 && errno == ENOENT) {
> > +		close(firmware_node_fd);
> >  		return false;
> > +	}
> >
> > -	igt_require(fd > 0);
> > +	igt_assert(errno > 0);
> >
> > +	close(firmware_node_fd);
> > +	close(fd);
> >  	return true;
> >  }
> >
> > --
> > 2.25.1
> >