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Date: Mon, 6 May 2013 16:15:30 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Gavin Shan <shangw@...ux.vnet.ibm.com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 2/2] PCI: Skip IORESOURCE_IO size and allocation for root bus without ioport range
BenH reported that there is some assign unassigned resource problem
in powerpc.
It turns out after
| commit 0c5be0cb0edfe3b5c4b62eac68aa2aa15ec681af
| Date: Thu Feb 23 19:23:29 2012 -0800
|
| PCI: Retry on IORESOURCE_IO type allocations
even the root bus does not have io port range, it will keep retrying
to realloc with mmio.
Current retry logic is : try with must+optional at first, and if
it fails will try must then try to extend must with optional.
That will fail as mmio-non-pref and mmio-pref for bridge will
be next to each other. So we have no chance to extend mmio-non-pref.
We should not fall into retry in this case, as root bus does
not io port range.
We check if the root bus has ioport range, and set bus_res_type_mask,
and pass it to __bus_size_bridges and skip io port resources.
For the retry failing, we could allocate mmio-non-pref bottom-up
and mmio-pref will be top-down, but that could not be material for v3.10.
Reported-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
drivers/pci/setup-bus.c | 39 +++++++++++++++++++++++++++++++--------
1 file changed, 31 insertions(+), 8 deletions(-)
Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -1045,7 +1045,8 @@ handle_done:
}
static void __ref __pci_bus_size_bridges(struct pci_bus *bus,
- struct list_head *realloc_head)
+ struct list_head *realloc_head,
+ unsigned long res_type_mask)
{
struct pci_dev *dev;
unsigned long mask, prefmask;
@@ -1063,7 +1064,7 @@ static void __ref __pci_bus_size_bridges
case PCI_CLASS_BRIDGE_PCI:
default:
- __pci_bus_size_bridges(b, realloc_head);
+ __pci_bus_size_bridges(b, realloc_head, res_type_mask);
break;
}
}
@@ -1087,8 +1088,9 @@ static void __ref __pci_bus_size_bridges
* Follow thru
*/
default:
- pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
- additional_io_size, realloc_head);
+ if (res_type_mask & IORESOURCE_IO)
+ pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
+ additional_io_size, realloc_head);
/* 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
@@ -1111,7 +1113,10 @@ static void __ref __pci_bus_size_bridges
void __ref pci_bus_size_bridges(struct pci_bus *bus)
{
- __pci_bus_size_bridges(bus, NULL);
+ unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+ __pci_bus_size_bridges(bus, NULL, type_mask);
}
EXPORT_SYMBOL(pci_bus_size_bridges);
@@ -1376,6 +1381,21 @@ static enum enable_type __init pci_reall
return enable_local;
}
+static unsigned int __init pci_bus_res_type_mask(struct pci_bus *bus)
+{
+ int i;
+ struct resource *r;
+ unsigned long mask = 0;
+ unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+ pci_bus_for_each_resource(bus, r, i)
+ if (r)
+ mask |= r->flags & type_mask;
+
+ return mask;
+}
+
/*
* first try will not touch pci bridge res
* second and later try will clear small leaf bridge res
@@ -1395,6 +1415,7 @@ pci_assign_unassigned_root_bus_resources
IORESOURCE_PREFETCH;
int pci_try_num = 1;
enum enable_type enable_local;
+ unsigned long bus_res_type_mask = pci_bus_res_type_mask(bus);
/* don't realloc if asked to do so */
enable_local = pci_realloc_detect(bus, pci_realloc_enable);
@@ -1416,7 +1437,7 @@ again:
add_list = &realloc_head;
/* Depth first, calculate sizes and alignments of all
subordinate buses. */
- __pci_bus_size_bridges(bus, add_list);
+ __pci_bus_size_bridges(bus, add_list, bus_res_type_mask);
/* Depth last, allocate resources and update the hardware. */
__pci_bus_assign_resources(bus, add_list, &fail_head);
@@ -1496,9 +1517,10 @@ void pci_assign_unassigned_bridge_resour
int retval;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;
+ unsigned long bus_res_type_mask = pci_bus_res_type_mask(bridge->bus);
again:
- __pci_bus_size_bridges(parent, &add_list);
+ __pci_bus_size_bridges(parent, &add_list, bus_res_type_mask);
__pci_bridge_assign_resources(bridge, &add_list, &fail_head);
BUG_ON(!list_empty(&add_list));
tried_times++;
@@ -1554,6 +1576,7 @@ void pci_assign_unassigned_bus_resources
struct pci_dev *dev;
LIST_HEAD(add_list); /* list of resources that
want additional resources */
+ unsigned long bus_res_type_mask = pci_bus_res_type_mask(bus);
down_read(&pci_bus_sem);
list_for_each_entry(dev, &bus->devices, bus_list)
@@ -1561,7 +1584,7 @@ void pci_assign_unassigned_bus_resources
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (dev->subordinate)
__pci_bus_size_bridges(dev->subordinate,
- &add_list);
+ &add_list, bus_res_type_mask);
up_read(&pci_bus_sem);
__pci_bus_assign_resources(bus, &add_list, NULL);
BUG_ON(!list_empty(&add_list));
--
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