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Subject[PATCH 11/13] PCI: Add has_mem64 for struct host_bridge
Date
Add has_mem64 for struct host_bridge, on root bus that does not support
mmio64 above 4g, will not set that.

We will use that info next two following patches:
1. Don't treat non-pref mmio64 as pref mmio, so will not put
it under bridge's pref range when rescan the devices
2. will keep pref mmio64 and pref mmio32 under bridge pref bar.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Tested-by: Khalid Aziz <khalid.aziz@oracle.com>
---
drivers/pci/probe.c | 7 +++++++
include/linux/pci.h | 1 +
2 files changed, 8 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 676b55f..8f439e0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -818,6 +818,13 @@ int pci_register_host_bridge(struct pci_host_bridge *bridge)
addr[0] = '\0';

dev_info(&bus->dev, "root bus resource %pR%s\n", res, addr);
+
+ if (resource_type(res) == IORESOURCE_MEM) {
+ if ((res->end - offset) > 0xffffffff)
+ bridge->has_mem64 = 1;
+ if ((res->start - offset) > 0xffffffff)
+ res->flags |= IORESOURCE_MEM_64;
+ }
}

down_write(&pci_bus_sem);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index b14dd94..a3693ef 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -436,6 +436,7 @@ struct pci_host_bridge {
void *release_data;
struct msi_controller *msi;
unsigned int ignore_reset_delay:1; /* for entire hierarchy */
+ unsigned int has_mem64:1;
/* Resource alignment requirements */
resource_size_t (*align_resource)(struct pci_dev *dev,
const struct resource *res,
--
2.9.3
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