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PCI: pcie: Ensure hotplug ports have a minimum number of resources

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In general a BIOS may goof or we may hotplug in a hotplug controller.
In either case the kernel needs to reserve resources for plugging
in more devices in the future instead of creating a minimal resource
assignment.

We already do this for cardbus bridges I am just adding a variant
for pcie bridges.

v2: Make testing for pcie hotplug bridges based on a flag.

    So far we only set the flag for pcie but a header_quirk
    could easily be added for the non-standard pci hotplug
    bridges.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Eric W. Biederman
2009-09-09 14:09:24 -07:00
committed by Jesse Barnes
parent 0ba379ec0f
commit 28760489a3
4 changed files with 49 additions and 5 deletions
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18
drivers/pci/probe.c
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@@ -697,6 +697,23 @@ static void set_pcie_port_type(struct pci_dev *pdev)
pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
}
static void set_pcie_hotplug_bridge(struct pci_dev *pdev)
{
int pos;
u16 reg16;
u32 reg32;
pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
if (!pos)
return;
pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
if (!(reg16 & PCI_EXP_FLAGS_SLOT))
return;
pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, &reg32);
if (reg32 & PCI_EXP_SLTCAP_HPC)
pdev->is_hotplug_bridge = 1;
}
#define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
/**
@@ -804,6 +821,7 @@ int pci_setup_device(struct pci_dev *dev)
pci_read_irq(dev);
dev->transparent = ((dev->class & 0xff) == 1);
pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
set_pcie_hotplug_bridge(dev);
break;
case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */