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From: Bjorn Helgaas <bhelgaas@google.com>
To: "Bruno Prémont" <bonbons@linux-vserver.org>
Cc: Andreas Noever <andreas.noever@gmail.com>,
	DRI mailing list <dri-devel@lists.freedesktop.org>,
	Linux PCI <linux-pci@vger.kernel.org>,
	Dave Airlie <airlied@linux.ie>,
	Matthew Garrett <matthew.garrett@nebula.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [PATCH 0/2] x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup()
Date: Thu, 21 Aug 2014 23:39:31 -0500	[thread overview]
Message-ID: <CAErSpo6D1B+dPLrYoAF4OA1KeWuW8VZW2_RR5jB1GbCRo+6vHg@mail.gmail.com> (raw)
In-Reply-To: <20140821233435.19a9cffa@neptune.home>

On Thu, Aug 21, 2014 at 4:34 PM, Bruno Prémont
<bonbons@linux-vserver.org> wrote:

> A second step would then be to tune vgaarb's initial selection.
> Bjorn, is it possible to verify which I/O ports are decoded by a PCI
> device at the time of adding it to vgaarb? If so, how? I would like to
> check for legacy VGA I/O range (0x03B0-0x03DF) and only let vgaarb set
> a device as default if that I/O range is decoded by the device.

I don't know of a way.  I'm pretty sure VGA devices are allowed to
respond to those legacy addresses even if there's no BAR for them, but
I haven't found a spec reference for this.  There is the VGA Enable
bit in bridges, of course (PCI Bridge spec, sec 12.1.1.  If the VGA
device is behind a bridge that doesn't have the VGA Enable bit set, it
probably isn't the default device.

Bjorn

  reply	other threads:[~2014-08-22  4:39 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-14 20:43 [Patch] x86, ia64, efifb: Move boot_vga fixup from pci to vgaarb Bruno Prémont
2014-05-14 20:43 ` Bruno Prémont
2014-05-27 23:42 ` Bjorn Helgaas
2014-05-27 23:42   ` Bjorn Helgaas
2014-06-02 18:16   ` Bruno Prémont
2014-06-02 18:16     ` Bruno Prémont
2014-06-02 18:19     ` [PATCH 2/2] x86, ia64: Merge common vga fixup code Bruno Prémont
2014-06-02 18:19       ` Bruno Prémont
2014-06-02 18:19     ` [PATCH 1/2] x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup() Bruno Prémont
2014-06-02 18:19       ` Bruno Prémont
2014-06-17 22:35       ` Bjorn Helgaas
2014-06-17 22:35         ` Bjorn Helgaas
2014-06-18  6:09         ` Bruno Prémont
2014-06-18  6:09           ` Bruno Prémont
2014-06-24 20:41       ` Bruno Prémont
2014-06-24 20:41         ` Bruno Prémont
2014-06-24 22:55       ` [PATCH 1/2 v2] " Bruno Prémont
2014-06-24 22:55         ` Bruno Prémont
2014-06-24 22:58         ` [PATCH 2/2 v2] x86, ia64: Merge common vga fixup code Bruno Prémont
2014-06-24 22:58           ` Bruno Prémont
2014-06-24 23:02         ` [PATCH 1/2 v2] x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup() Matthew Garrett
2014-06-24 23:02           ` Matthew Garrett
2014-07-05 17:15         ` Bjorn Helgaas
2014-08-10  0:21           ` Andreas Noever
2014-08-10  0:36             ` Andreas Noever
2014-08-10  9:26               ` Bruno Prémont
2014-08-10  9:26                 ` Bruno Prémont
2014-08-10  9:56                 ` Andreas Noever
2014-08-10 16:34                   ` Bruno Prémont
2014-08-10 16:34                     ` Bruno Prémont
2014-08-14  0:40                     ` Andreas Noever
2014-08-16 17:21                       ` [PATCH 0/2] " Bruno Prémont
2014-08-16 17:21                         ` Bruno Prémont
2014-08-16 17:25                         ` [PATCH 1/2] vgaarb: Drop obsolete #ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE Bruno Prémont
2014-08-16 17:25                           ` Bruno Prémont
2014-08-16 17:30                         ` [PATCH 2/2] x86, ia64: Don't default to first video device Bruno Prémont
2014-08-16 17:30                           ` Bruno Prémont
2014-08-19 15:45                         ` [PATCH 0/2] x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup() Andreas Noever
2014-08-20  5:55                           ` Bruno Prémont
2014-08-20  7:11                             ` Bruno Prémont
2014-08-21 15:55                               ` Andreas Noever
2014-08-21 21:34                                 ` Bruno Prémont
2014-08-21 21:34                                   ` Bruno Prémont
2014-08-22  4:39                                   ` Bjorn Helgaas [this message]
2014-08-22  6:23                                     ` Bruno Prémont
2014-08-22 20:30                                       ` Andreas Noever
2014-08-23 11:06                                         ` Bruno Prémont
2014-08-24 21:09                                           ` [PATCH 1/2 v2] vgaarb: Don't default exclusively to first video device with mem+io Bruno Prémont
2014-08-24 21:09                                             ` Bruno Prémont
2014-08-26 15:32                                             ` Andreas Noever
2014-08-28 20:47                                               ` Bruno Prémont
2014-08-28 20:47                                                 ` Bruno Prémont
2014-09-12 11:19                                                 ` Bruno Prémont
2014-09-12 14:28                                                   ` Bjorn Helgaas
2014-09-12 14:28                                                     ` Bjorn Helgaas
2014-09-18 23:26                                                     ` Dave Airlie
2014-09-19  5:18                                                       ` Bjorn Helgaas
2014-09-19  5:18                                                         ` Bjorn Helgaas
2014-08-24 21:13                                           ` [PATCH 2/2 v2] vgaarb: Drop obsolete #ifndef Bruno Prémont
2014-08-25 12:16                                       ` [PATCH 0/2] x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup() Daniel Vetter
2014-08-25 12:16                                         ` Daniel Vetter
2014-08-25 12:39                                         ` Bruno Prémont

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