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>

3 files changed, 55 insertions, 13 deletions

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 97a8194063b5..40af27f31043 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -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;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f1ae2475ffff..b962326e3d95 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -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",
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index a00f85471b6e..e1c360a5b0db 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -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;
 }