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PCI/x86: don't assume prefetchable ranges are 64bit 

We should not assign 64bit ranges to PCI devices that only take 32bit
prefetchable addresses.

Try to set IORESOURCE_MEM_64 in 64bit resource of pci_device/pci_bridge
and make the bus resource only have that bit set when all devices under
it support 64bit prefetchable memory.  Use that flag to allocate
resources from that range.

Reported-by: Yannick <yannick.roehlly@free.fr>
Reviewed-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yinghai Lu 2009-04-23 20:48:32 -07:00 committed by Jesse Barnes
parent 67b5db6502
commit 1f82de10d6
6 changed files with 62 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/pci.h
View File

@ -130,6 +130,7 @@ extern void pci_iommu_alloc(void);
/* generic pci stuff */
#include <asm-generic/pci.h>
#define PCIBIOS_MAX_MEM_32 0xffffffff
#ifdef CONFIG_NUMA
/* Returns the node based on pci bus */

7
drivers/pci/bus.c
View File

@ -41,9 +41,14 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
void *alignf_data)
{
int i, ret = -ENOMEM;
resource_size_t max = -1;
type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
/* don't allocate too high if the pref mem doesn't support 64bit*/
if (!(res->flags & IORESOURCE_MEM_64))
max = PCIBIOS_MAX_MEM_32;
for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
struct resource *r = bus->resource[i];
if (!r)
@ -62,7 +67,7 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
/* Ok, try it out.. */
ret = allocate_resource(r, res, size,
r->start ? : min,
-1, align,
max, align,
alignf, alignf_data);
if (ret == 0)
break;

9
drivers/pci/probe.c
View File

@ -193,7 +193,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
if (type == pci_bar_io) {
l &= PCI_BASE_ADDRESS_IO_MASK;
mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
mask = PCI_BASE_ADDRESS_IO_MASK & IO_SPACE_LIMIT;
} else {
l &= PCI_BASE_ADDRESS_MEM_MASK;
mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
@ -237,6 +237,8 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
dev_printk(KERN_DEBUG, &dev->dev,
"reg %x 64bit mmio: %pR\n", pos, res);
}
res->flags |= IORESOURCE_MEM_64;
} else {
sz = pci_size(l, sz, mask);
@ -362,7 +364,10 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
}
}
if (base <= limit) {
res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (res->flags & PCI_PREF_RANGE_TYPE_64)
res->flags |= IORESOURCE_MEM_64;
res->start = base;
res->end = limit + 0xfffff;
dev_printk(KERN_DEBUG, &dev->dev, "bridge %sbit mmio pref: %pR\n",

52
drivers/pci/setup-bus.c
View File

@ -143,6 +143,7 @@ static void pci_setup_bridge(struct pci_bus *bus)
struct pci_dev *bridge = bus->self;
struct pci_bus_region region;
u32 l, bu, lu, io_upper16;
int pref_mem64;
if (pci_is_enabled(bridge))
return;
@ -198,16 +199,22 @@ static void pci_setup_bridge(struct pci_bus *bus)
pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
/* Set up PREF base/limit. */
pref_mem64 = 0;
bu = lu = 0;
pcibios_resource_to_bus(bridge, &region, bus->resource[2]);
if (bus->resource[2]->flags & IORESOURCE_PREFETCH) {
int width = 8;
l = (region.start >> 16) & 0xfff0;
l |= region.end & 0xfff00000;
bu = upper_32_bits(region.start);
lu = upper_32_bits(region.end);
dev_info(&bridge->dev, " PREFETCH window: %#016llx-%#016llx\n",
(unsigned long long)region.start,
(unsigned long long)region.end);
if (bus->resource[2]->flags & IORESOURCE_MEM_64) {
pref_mem64 = 1;
bu = upper_32_bits(region.start);
lu = upper_32_bits(region.end);
width = 16;
}
dev_info(&bridge->dev, " PREFETCH window: %#0*llx-%#0*llx\n",
width, (unsigned long long)region.start,
width, (unsigned long long)region.end);
}
else {
l = 0x0000fff0;
@ -215,9 +222,11 @@ static void pci_setup_bridge(struct pci_bus *bus)
}
pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
/* Set the upper 32 bits of PREF base & limit. */
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
if (pref_mem64) {
/* Set the upper 32 bits of PREF base & limit. */
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
}
pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
}
@ -255,8 +264,25 @@ static void pci_bridge_check_ranges(struct pci_bus *bus)
pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
}
if (pmem)
if (pmem) {
b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64)
b_res[2].flags |= IORESOURCE_MEM_64;
}
/* double check if bridge does support 64 bit pref */
if (b_res[2].flags & IORESOURCE_MEM_64) {
u32 mem_base_hi, tmp;
pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
&mem_base_hi);
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
0xffffffff);
pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
if (!tmp)
b_res[2].flags &= ~IORESOURCE_MEM_64;
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
mem_base_hi);
}
}
/* Helper function for sizing routines: find first available
@ -336,6 +362,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long
resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
int order, max_order;
struct resource *b_res = find_free_bus_resource(bus, type);
unsigned int mem64_mask = 0;
if (!b_res)
return 0;
@ -344,9 +371,12 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long
max_order = 0;
size = 0;
mem64_mask = b_res->flags & IORESOURCE_MEM_64;
b_res->flags &= ~IORESOURCE_MEM_64;
list_for_each_entry(dev, &bus->devices, bus_list) {
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
resource_size_t r_size;
@ -372,6 +402,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long
aligns[order] += align;
if (order > max_order)
max_order = order;
mem64_mask &= r->flags & IORESOURCE_MEM_64;
}
}
@ -396,6 +427,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long
b_res->start = min_align;
b_res->end = size + min_align - 1;
b_res->flags |= IORESOURCE_STARTALIGN;
b_res->flags |= mem64_mask;
return 1;
}

2
include/linux/ioport.h
View File

@ -49,6 +49,8 @@ struct resource_list {
#define IORESOURCE_SIZEALIGN 0x00020000 /* size indicates alignment */
#define IORESOURCE_STARTALIGN 0x00040000 /* start field is alignment */
#define IORESOURCE_MEM_64 0x00100000
#define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */
#define IORESOURCE_DISABLED 0x10000000
#define IORESOURCE_UNSET 0x20000000

4
include/linux/pci.h
View File

@ -1097,6 +1097,10 @@ static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus,
#include <asm/pci.h>
#ifndef PCIBIOS_MAX_MEM_32
#define PCIBIOS_MAX_MEM_32 (-1)
#endif
/* these helpers provide future and backwards compatibility
* for accessing popular PCI BAR info */
#define pci_resource_start(dev, bar) ((dev)->resource[(bar)].start)