On Mon, Jul 18, 2016 at 08:27:18AM +0200, Thierry Reding wrote: > On Sun, Jul 17, 2016 at 02:27:25AM +0200, Andreas Färber wrote: > > Hi, > > > > When I boot my Jetson TK1, by default I get this from lspci: > > > > 00:02.0 PCI bridge: NVIDIA Corporation TegraK1 PCIe x1 Bridge (rev a1) > > 01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. > > RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c) > > > > If however I plug some mini PCIe card, I get this instead: > > > > 00:01.0 PCI bridge: NVIDIA Corporation TegraK1 PCIe x4 Bridge (rev a1) > > 00:02.0 PCI bridge: NVIDIA Corporation TegraK1 PCIe x1 Bridge (rev a1) > > 01:00.0 Network controller: MEDIATEK Corp. Device 7612 > > 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. > > RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c) > > > > I.e., there is a new Tegra PCIe x4 bridge and the number of the previous > > x1 bridge changed. > > > > That is ugly because it changes the ID of the on-board PCI NIC from > > 01:00.0 to 02:00.0, which on openSUSE renames the network interface from > > enp1s0 to enp2s0, so that my /etc/sysconfig/network/ifcfg-enp1s0 does > > not take effect and the network interface doesn't come up. > > > > Tested with U-Boot v2016.05 and v2016.07 and kernel 4.6.2 and 4.7-rc6. > > > > Shouldn't U-Boot or the kernel driver always configure the PCIe ports > > the same way (both bridges available) since the slot is always there on > > this board? > > I don't think that's going to ensure stable naming of devices. Linux > uses depth-first sorting when enumerating devices, so if you attach any > kind of bridge device to the first port, anything downstream of the > second port still won't get a stable B/D/F. > > That said, I see how what you're proposing could help at least minimize > the potential for instability in numbering. Could you try to uncomment > the tegra_pcie_port_free() line in tegra_pcie_enable() of the Tegra PCI > host controller driver (drivers/pci/host/pci-tegra.c) and see if that > improves things in your use-case? It's slightly hackish because it does > allow access to the root port even if it's disabled, so I'm not sure it > will work (might give you an external abort or something like that) but > it might be worth a quick try.
The below seems to work fine for me. Can you verify that this works for
you, too?
Thanks,
Thierry
--- >8 ---
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index c388468c202a..0b8616e25d7b 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -587,17 +587,6 @@ static void tegra_pcie_port_disable(struct tegra_pcie_port
*port)
afi_writel(port->pcie, value, ctrl);
}
-static void tegra_pcie_port_free(struct tegra_pcie_port *port)
-{
- struct tegra_pcie *pcie = port->pcie;
-
- devm_iounmap(pcie->dev, port->base);
- devm_release_mem_region(pcie->dev, port->regs.start,
- resource_size(&port->regs));
- list_del(&port->list);
- devm_kfree(pcie->dev, port);
-}
-
/* Tegra PCIE root complex wrongly reports device class */
static void tegra_pcie_fixup_class(struct pci_dev *dev)
{
@@ -2053,7 +2042,6 @@ static int tegra_pcie_enable(struct tegra_pcie *pcie)
dev_info(pcie->dev, "link %u down, ignoring\n", port->index);
tegra_pcie_port_disable(port);
- tegra_pcie_port_free(port);
}
memset(&hw, 0, sizeof(hw));
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