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authorBjorn Helgaas <bhelgaas@google.com>2014-01-10 22:23:15 +0100
committerBjorn Helgaas <bhelgaas@google.com>2014-01-10 22:23:15 +0100
commit96702be560374ee7e7139a34cab03554129abbb4 (patch)
treeede7f763c471fad6d268a2e6a1d17d029b3eaf31 /drivers/pci/bus.c
parentMerge branch 'pci/msi' into next (diff)
parentPCI: Allocate 64-bit BARs above 4G when possible (diff)
downloadlinux-96702be560374ee7e7139a34cab03554129abbb4.tar.xz
linux-96702be560374ee7e7139a34cab03554129abbb4.zip
Merge branch 'pci/resource' into next
* pci/resource: PCI: Allocate 64-bit BARs above 4G when possible PCI: Enforce bus address limits in resource allocation PCI: Split out bridge window override of minimum allocation address agp/ati: Use PCI_COMMAND instead of hard-coded 4 agp/intel: Use CPU physical address, not bus address, for ioremap() agp/intel: Use pci_bus_address() to get GTTADR bus address agp/intel: Use pci_bus_address() to get MMADR bus address agp/intel: Support 64-bit GMADR agp/intel: Rename gtt_bus_addr to gtt_phys_addr drm/i915: Rename gtt_bus_addr to gtt_phys_addr agp: Use pci_resource_start() to get CPU physical address for BAR agp: Support 64-bit APBASE PCI: Add pci_bus_address() to get bus address of a BAR PCI: Convert pcibios_resource_to_bus() to take a pci_bus, not a pci_dev PCI: Change pci_bus_region addresses to dma_addr_t
Diffstat (limited to 'drivers/pci/bus.c')
-rw-r--r--drivers/pci/bus.c132
1 files changed, 102 insertions, 30 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index a037d81f21ed..00660cc502c5 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -98,41 +98,54 @@ void pci_bus_remove_resources(struct pci_bus *bus)
}
}
-/**
- * pci_bus_alloc_resource - allocate a resource from a parent bus
- * @bus: PCI bus
- * @res: resource to allocate
- * @size: size of resource to allocate
- * @align: alignment of resource to allocate
- * @min: minimum /proc/iomem address to allocate
- * @type_mask: IORESOURCE_* type flags
- * @alignf: resource alignment function
- * @alignf_data: data argument for resource alignment function
- *
- * Given the PCI bus a device resides on, the size, minimum address,
- * alignment and type, try to find an acceptable resource allocation
- * for a specific device resource.
+static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+static struct pci_bus_region pci_64_bit = {0,
+ (dma_addr_t) 0xffffffffffffffffULL};
+static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL,
+ (dma_addr_t) 0xffffffffffffffffULL};
+#endif
+
+/*
+ * @res contains CPU addresses. Clip it so the corresponding bus addresses
+ * on @bus are entirely within @region. This is used to control the bus
+ * addresses of resources we allocate, e.g., we may need a resource that
+ * can be mapped by a 32-bit BAR.
*/
-int
-pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
+static void pci_clip_resource_to_region(struct pci_bus *bus,
+ struct resource *res,
+ struct pci_bus_region *region)
+{
+ struct pci_bus_region r;
+
+ pcibios_resource_to_bus(bus, &r, res);
+ if (r.start < region->start)
+ r.start = region->start;
+ if (r.end > region->end)
+ r.end = region->end;
+
+ if (r.end < r.start)
+ res->end = res->start - 1;
+ else
+ pcibios_bus_to_resource(bus, res, &r);
+}
+
+static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
resource_size_t size, resource_size_t align,
resource_size_t min, unsigned int type_mask,
resource_size_t (*alignf)(void *,
const struct resource *,
resource_size_t,
resource_size_t),
- void *alignf_data)
+ void *alignf_data,
+ struct pci_bus_region *region)
{
- int i, ret = -ENOMEM;
- struct resource *r;
- resource_size_t max = -1;
+ int i, ret;
+ struct resource *r, avail;
+ resource_size_t max;
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;
-
pci_bus_for_each_resource(bus, r, i) {
if (!r)
continue;
@@ -147,15 +160,74 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
!(res->flags & IORESOURCE_PREFETCH))
continue;
+ avail = *r;
+ pci_clip_resource_to_region(bus, &avail, region);
+ if (!resource_size(&avail))
+ continue;
+
+ /*
+ * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
+ * protect badly documented motherboard resources, but if
+ * this is an already-configured bridge window, its start
+ * overrides "min".
+ */
+ if (avail.start)
+ min = avail.start;
+
+ max = avail.end;
+
/* Ok, try it out.. */
- ret = allocate_resource(r, res, size,
- r->start ? : min,
- max, align,
- alignf, alignf_data);
+ ret = allocate_resource(r, res, size, min, max,
+ align, alignf, alignf_data);
if (ret == 0)
- break;
+ return 0;
}
- return ret;
+ return -ENOMEM;
+}
+
+/**
+ * pci_bus_alloc_resource - allocate a resource from a parent bus
+ * @bus: PCI bus
+ * @res: resource to allocate
+ * @size: size of resource to allocate
+ * @align: alignment of resource to allocate
+ * @min: minimum /proc/iomem address to allocate
+ * @type_mask: IORESOURCE_* type flags
+ * @alignf: resource alignment function
+ * @alignf_data: data argument for resource alignment function
+ *
+ * Given the PCI bus a device resides on, the size, minimum address,
+ * alignment and type, try to find an acceptable resource allocation
+ * for a specific device resource.
+ */
+int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
+ resource_size_t size, resource_size_t align,
+ resource_size_t min, unsigned int type_mask,
+ resource_size_t (*alignf)(void *,
+ const struct resource *,
+ resource_size_t,
+ resource_size_t),
+ void *alignf_data)
+{
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ int rc;
+
+ if (res->flags & IORESOURCE_MEM_64) {
+ rc = pci_bus_alloc_from_region(bus, res, size, align, min,
+ type_mask, alignf, alignf_data,
+ &pci_high);
+ if (rc == 0)
+ return 0;
+
+ return pci_bus_alloc_from_region(bus, res, size, align, min,
+ type_mask, alignf, alignf_data,
+ &pci_64_bit);
+ }
+#endif
+
+ return pci_bus_alloc_from_region(bus, res, size, align, min,
+ type_mask, alignf, alignf_data,
+ &pci_32_bit);
}
void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }