@@ -414,6 +414,7 @@ EXPORT_SYMBOL_GPL(pci_find_ht_capability);
struct resource *pci_find_parent_resource(const struct pci_dev *dev,
struct resource *res)
{
+ int flags = pci_resource_pref_compatible(dev, res);
const struct pci_bus *bus = dev->bus;
struct resource *r;
int i;
@@ -428,7 +429,7 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev,
* not, the allocator made a mistake.
*/
if (r->flags & IORESOURCE_PREFETCH &&
- !(res->flags & IORESOURCE_PREFETCH))
+ !(flags & IORESOURCE_PREFETCH))
return NULL;
/*
@@ -335,4 +335,6 @@ static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe)
struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus);
+int pci_resource_pref_compatible(const struct pci_dev *dev,
+ struct resource *res);
#endif /* DRIVERS_PCI_H */
@@ -1544,6 +1544,36 @@ static void pci_init_capabilities(struct pci_dev *dev)
pci_enable_acs(dev);
}
+static bool pci_up_path_over_pcie(struct pci_bus *bus)
+{
+ if (pci_is_root_bus(bus))
+ return true;
+
+ if (bus->self && !pci_is_pcie(bus->self))
+ return false;
+
+ return pci_up_path_over_pcie(bus->parent);
+}
+
+/*
+ * According to
+ * https://www.pcisig.com/specifications/pciexpress/base2/PCIe_Base_r2.1_Errata_08Jun10.pdf
+ * page 13, system firmware could put some 64bit non-pref under 64bit pref,
+ * on some cases.
+ * Let's mark if entire path from the host to the adapter is over PCI
+ * Express. later will use that compute pref compaitable bit.
+ */
+static void pci_set_on_all_pcie_path(struct pci_dev *dev)
+{
+ if (!pci_is_pcie(dev))
+ return;
+
+ if (!pci_up_path_over_pcie(dev->bus))
+ return;
+
+ dev->on_all_pcie_path = 1;
+}
+
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
{
int ret;
@@ -1574,6 +1604,9 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
/* Initialize various capabilities */
pci_init_capabilities(dev);
+ /* After pcie_cap is assigned */
+ pci_set_on_all_pcie_path(dev);
+
/*
* Add the device to our list of discovered devices
* and the bus list for fixup functions, etc.
@@ -1032,6 +1032,20 @@ int pci_claim_bridge_resource(struct pci_dev *bridge, int i)
return -EINVAL;
}
+int pci_resource_pref_compatible(const struct pci_dev *dev,
+ struct resource *res)
+{
+ if (res->flags & IORESOURCE_PREFETCH)
+ return res->flags;
+
+ if ((res->flags & IORESOURCE_MEM) &&
+ (res->flags & IORESOURCE_MEM_64) &&
+ dev->on_all_pcie_path)
+ return res->flags | IORESOURCE_PREFETCH;
+
+ return res->flags;
+}
+
/* Check whether the bridge supports optional I/O and
prefetchable memory ranges. If not, the respective
base/limit registers must be read-only and read as 0. */
@@ -1526,10 +1540,11 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
resource_size_t r_size, align;
+ int flags = pci_resource_pref_compatible(dev, r);
- if (r->parent || ((r->flags & mask) != type &&
- (r->flags & mask) != type2 &&
- (r->flags & mask) != type3))
+ if (r->parent || ((flags & mask) != type &&
+ (flags & mask) != type2 &&
+ (flags & mask) != type3))
continue;
r_size = resource_size(r);
@@ -250,15 +250,19 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
static int _pci_assign_resource(struct pci_dev *dev, int resno,
resource_size_t size, resource_size_t min_align)
{
+ struct resource *res = dev->resource + resno;
+ int old_flags = res->flags;
struct pci_bus *bus;
int ret;
+ res->flags = pci_resource_pref_compatible(dev, res);
bus = dev->bus;
while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
if (!bus->parent || !bus->self->transparent)
break;
bus = bus->parent;
}
+ res->flags = old_flags;
return ret;
}
@@ -309,6 +309,7 @@ struct pci_dev {
powered on/off by the
corresponding bridge */
unsigned int ignore_hotplug:1; /* Ignore hotplug events */
+ unsigned int on_all_pcie_path:1; /* up to host-bridge all pcie */
unsigned int d3_delay; /* D3->D0 transition time in ms */
unsigned int d3cold_delay; /* D3cold->D0 transition time in ms */
We still get "no compatible bridge window" warning on sparc T5-8 after we add support for 64bit resource parsing for root bus. PCI: scan_bus[/pci@300/pci@1/pci@0/pci@6] bus no 8 PCI: Claiming 0000:00:01.0: Resource 15: 0000800100000000..00008004afffffff [220c] PCI: Claiming 0000:01:00.0: Resource 15: 0000800100000000..00008004afffffff [220c] PCI: Claiming 0000:02:04.0: Resource 15: 0000800100000000..000080012fffffff [220c] PCI: Claiming 0000:03:00.0: Resource 15: 0000800100000000..000080012fffffff [220c] PCI: Claiming 0000:04:06.0: Resource 14: 0000800100000000..000080010fffffff [220c] PCI: Claiming 0000:05:00.0: Resource 0: 0000800100000000..0000800100001fff [204] pci 0000:05:00.0: can't claim BAR 0 [mem 0x800100000000-0x800100001fff]: no compatible bridge window All the bridges 64-bit resource have pref bit, but the device resource does not have pref set, then we can not find parent for the device resource, as we can not put non-pref mem under pref mem. According to pcie spec errta https://www.pcisig.com/specifications/pciexpress/base2/PCIe_Base_r2.1_Errata_08Jun10.pdf page 13, in some case it is ok to mark some as pref. Mark if the entire path from the host to the adapter is over PCI Express. Then set pref compatible bit for claim/sizing/assign for 64bit mem resource on that pcie device. -v2: set pref for mmio 64 when whole path is PCI Express, according to David Miller. -v3: don't set pref directly, change to UNDER_PREF, and set PREF before sizing and assign resource, and cleart PREF afterwards. requested by BenH. -v4: use on_all_pcie_path device flag instead. Fixes: commit d63e2e1f3df9 ("sparc/PCI: Clip bridge windows to fit in upstream windows") Link: http://lkml.kernel.org/r/CAE9FiQU1gJY1LYrxs+ma5LCTEEe4xmtjRG0aXJ9K_Tsu+m9Wuw@mail.gmail.com Reported-by: David Ahern <david.ahern@oracle.com> Tested-by: David Ahern <david.ahern@oracle.com> Link: https://bugzilla.kernel.org/show_bug.cgi?id=81431 Tested-by: TJ <linux@iam.tj> Signed-off-by: Yinghai Lu <yinghai@kernel.org> --- drivers/pci/pci.c | 3 ++- drivers/pci/pci.h | 2 ++ drivers/pci/probe.c | 33 +++++++++++++++++++++++++++++++++ drivers/pci/setup-bus.c | 21 ++++++++++++++++++--- drivers/pci/setup-res.c | 4 ++++ include/linux/pci.h | 1 + 6 files changed, 60 insertions(+), 4 deletions(-)