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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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22
drivers/pci/setup-bus.c
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@@ -309,7 +309,7 @@ static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned lon
since these windows have 4K granularity and the IO ranges
of non-bridge PCI devices are limited to 256 bytes.
We must be careful with the ISA aliasing though. */
static void pbus_size_io(struct pci_bus *bus)
static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
{
struct pci_dev *dev;
struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
@@ -336,6 +336,8 @@ static void pbus_size_io(struct pci_bus *bus)
size1 += r_size;
}
}
if (size < min_size)
size = min_size;
/* To be fixed in 2.5: we should have sort of HAVE_ISA
flag in the struct pci_bus. */
#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
@@ -354,7 +356,8 @@ static void pbus_size_io(struct pci_bus *bus)
/* Calculate the size of the bus and minimal alignment which
guarantees that all child resources fit in this size. */
static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long type)
static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
unsigned long type, resource_size_t min_size)
{
struct pci_dev *dev;
resource_size_t min_align, align, size;
@@ -404,6 +407,8 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long
mem64_mask &= r->flags & IORESOURCE_MEM_64;
}
}
if (size < min_size)
size = min_size;
align = 0;
min_align = 0;
@@ -483,6 +488,7 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
{
struct pci_dev *dev;
unsigned long mask, prefmask;
resource_size_t min_mem_size = 0, min_io_size = 0;
list_for_each_entry(dev, &bus->devices, bus_list) {
struct pci_bus *b = dev->subordinate;
@@ -512,8 +518,12 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
case PCI_CLASS_BRIDGE_PCI:
pci_bridge_check_ranges(bus);
if (bus->self->is_hotplug_bridge) {
min_io_size = pci_hotplug_io_size;
min_mem_size = pci_hotplug_mem_size;
}
default:
pbus_size_io(bus);
pbus_size_io(bus, min_io_size);
/* If the bridge supports prefetchable range, size it
separately. If it doesn't, or its prefetchable window
has already been allocated by arch code, try
@@ -521,9 +531,11 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
resources. */
mask = IORESOURCE_MEM;
prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (pbus_size_mem(bus, prefmask, prefmask))
if (pbus_size_mem(bus, prefmask, prefmask, min_mem_size))
mask = prefmask; /* Success, size non-prefetch only. */
pbus_size_mem(bus, mask, IORESOURCE_MEM);
else
min_mem_size += min_mem_size;
pbus_size_mem(bus, mask, IORESOURCE_MEM, min_mem_size);
break;
}
}