From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47979) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dXpSn-0008CF-Om for qemu-devel@nongnu.org; Wed, 19 Jul 2017 09:56:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dXpSj-0003yz-RB for qemu-devel@nongnu.org; Wed, 19 Jul 2017 09:56:29 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:34839) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dXpSj-0003yG-HE for qemu-devel@nongnu.org; Wed, 19 Jul 2017 09:56:25 -0400 Date: Wed, 19 Jul 2017 09:56:12 -0400 From: Konrad Rzeszutek Wilk Message-ID: <20170719135612.GF5722@char.us.oracle.com> References: <1500470414-7911-1-git-send-email-zuban32s@gmail.com> <1500470414-7911-3-git-send-email-zuban32s@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1500470414-7911-3-git-send-email-zuban32s@gmail.com> Subject: Re: [Qemu-devel] [RFC PATCH 2/2] pci: enable RedHat pci bridges to reserve more buses List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Aleksandr Bezzubikov Cc: seabios@seabios.org, marcel@redhat.com, qemu-devel@nongnu.org On Wed, Jul 19, 2017 at 04:20:14PM +0300, Aleksandr Bezzubikov wrote: > In case of RedHat PCI bridges reserve additional buses, which number is provided It is "Red Hat" > in a vendor-specific capability. And perhaps also a #define ? > > Signed-off-by: Aleksandr Bezzubikov > --- > src/fw/pciinit.c | 12 ++++++++++-- > 1 file changed, 10 insertions(+), 2 deletions(-) > > diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c > index 08221e6..b6f3a01 100644 > --- a/src/fw/pciinit.c > +++ b/src/fw/pciinit.c > @@ -578,9 +578,17 @@ pci_bios_init_bus_rec(int bus, u8 *pci_bus) > pci_bios_init_bus_rec(secbus, pci_bus); > > if (subbus != *pci_bus) { > + u16 vendor = pci_config_readw(bdf, PCI_VENDOR_ID); > + u8 res_bus = 0; > + if (vendor == 0x1b36) { > + u8 cap = pci_find_capability_bdf(bdf, PCI_CAP_ID_VNDR, 0); > + if (cap) { > + res_bus = pci_config_readb(bdf, cap + 16); > + } > + } > dprintf(1, "PCI: subordinate bus = 0x%x -> 0x%x\n", > - subbus, *pci_bus); > - subbus = *pci_bus; > + subbus, *pci_bus + res_bus); > + subbus = *pci_bus + res_bus; > } else { > dprintf(1, "PCI: subordinate bus = 0x%x\n", subbus); > } > -- > 2.7.4 > >