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Subject[PATCH 1/4] pci: pciehp update the slot bridge res to get big range for pcie devices - v4


move out bus_size_bridges and assign resources out of pciehp_add_bridge()
and at last do them all together one time including slot bridge, to avoid to
call assign resources several times, when there are several bridges under the
slot bridge.

need to introduce pci_bridge_assign_resources there.

handle the case the slot bridge that doesn't get pre-allocated big enough res
from FW.
for example pcie devices need 256M, but the bridge only get preallocated 2M...

pci_setup_bridge() will take extra check_enabled for the slot bridge, otherwise
update res is not updated to bridge BAR. that is bridge is enabled already for
port service.

-v2: address Alex's concern about pci remove/rescan feature about pci_setup_bridge changes.
-v3: Kenji pointed out that pci_config_slot need to be called before pci_bus_add_devices()
-v4: move out pci_is_enabled checkout of pci_setup_bridge()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
drivers/pci/hotplug/pciehp_pci.c | 29 ++++++++++++---
drivers/pci/setup-bus.c | 73 ++++++++++++++++++++++++++++++++++++---
include/linux/pci.h | 1
3 files changed, 93 insertions(+), 10 deletions(-)
Index: linux-2.6/drivers/pci/hotplug/pciehp_pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/hotplug/pciehp_pci.c
+++ linux-2.6/drivers/pci/hotplug/pciehp_pci.c
@@ -53,19 +53,18 @@ static int __ref pciehp_add_bridge(struc
busnr = pci_scan_bridge(parent, dev, busnr, pass);
if (!dev->subordinate)
return -1;
- pci_bus_size_bridges(dev->subordinate);
- pci_bus_assign_resources(parent);
- pci_enable_bridges(parent);
- pci_bus_add_devices(parent);
+
return 0;
}

int pciehp_configure_device(struct slot *p_slot)
{
struct pci_dev *dev;
- struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
+ struct pci_dev *bridge = p_slot->ctrl->pcie->port;
+ struct pci_bus *parent = bridge->subordinate;
int num, fn;
struct controller *ctrl = p_slot->ctrl;
+ int retval;

dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
if (dev) {
@@ -96,12 +95,30 @@ int pciehp_configure_device(struct slot
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
pciehp_add_bridge(dev);
}
+ pci_dev_put(dev);
+ }
+
+ pci_bus_size_bridges(parent);
+ pci_clear_master(bridge);
+ pci_bridge_assign_resources(bridge);
+ retval = pci_reenable_device(bridge);
+ pci_set_master(bridge);
+ pci_enable_bridges(parent);
+
+ for (fn = 0; fn < 8; fn++) {
+ dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
+ if (!dev)
+ continue;
+ if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
+ pci_dev_put(dev);
+ continue;
+ }
pci_configure_slot(dev);
pci_dev_put(dev);
}

- pci_bus_assign_resources(parent);
pci_bus_add_devices(parent);
+
return 0;
}

Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -27,6 +27,44 @@
#include <linux/slab.h>
#include "pci.h"

+static void pdev_assign_resources_sorted(struct pci_dev *dev)
+{
+ struct resource *res;
+ struct resource_list head, *list, *tmp;
+ int idx;
+ u16 class = dev->class >> 8;
+
+ head.next = NULL;
+
+ /* Don't touch classless devices or host bridges or ioapics. */
+ if (class == PCI_CLASS_NOT_DEFINED ||
+ class == PCI_CLASS_BRIDGE_HOST)
+ return;
+
+ /* Don't touch ioapic devices already enabled by firmware */
+ if (class == PCI_CLASS_SYSTEM_PIC) {
+ u16 command;
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
+ return;
+ }
+
+ pdev_sort_resources(dev, &head);
+
+ for (list = head.next; list;) {
+ res = list->res;
+ idx = res - &list->dev->resource[0];
+ if (pci_assign_resource(list->dev, idx)) {
+ res->start = 0;
+ res->end = 0;
+ res->flags = 0;
+ }
+ tmp = list;
+ list = list->next;
+ kfree(tmp);
+ }
+}
+
static void pbus_assign_resources_sorted(const struct pci_bus *bus)
{
struct pci_dev *dev;
@@ -144,9 +182,6 @@ static void pci_setup_bridge(struct pci_
u32 l, bu, lu, io_upper16;
int pref_mem64;

- if (pci_is_enabled(bridge))
- return;
-
dev_info(&bridge->dev, "PCI bridge, secondary bus %04x:%02x\n",
pci_domain_nr(bus), bus->number);

@@ -550,6 +585,35 @@ void __ref pci_bus_size_bridges(struct p
}
EXPORT_SYMBOL(pci_bus_size_bridges);

+void __ref pci_bridge_assign_resources(const struct pci_dev *bridge)
+{
+ struct pci_bus *b;
+
+ pdev_assign_resources_sorted((struct pci_dev *)bridge);
+
+ b = bridge->subordinate;
+ if (!b)
+ return;
+
+ pci_bus_assign_resources(b);
+
+ switch (bridge->class >> 8) {
+ case PCI_CLASS_BRIDGE_PCI:
+ pci_setup_bridge(b);
+ break;
+
+ case PCI_CLASS_BRIDGE_CARDBUS:
+ pci_setup_cardbus(b);
+ break;
+
+ default:
+ dev_info(&bridge->dev, "not setting up bridge for bus "
+ "%04x:%02x\n", pci_domain_nr(b), b->number);
+ break;
+ }
+}
+EXPORT_SYMBOL(pci_bridge_assign_resources);
+
void __ref pci_bus_assign_resources(const struct pci_bus *bus)
{
struct pci_bus *b;
@@ -566,7 +630,8 @@ void __ref pci_bus_assign_resources(cons

switch (dev->class >> 8) {
case PCI_CLASS_BRIDGE_PCI:
- pci_setup_bridge(b);
+ if (!pci_is_enabled(dev))
+ pci_setup_bridge(b);
break;

case PCI_CLASS_BRIDGE_CARDBUS:
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -756,6 +756,7 @@ ssize_t pci_write_vpd(struct pci_dev *de
int pci_vpd_truncate(struct pci_dev *dev, size_t size);

/* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
+void pci_bridge_assign_resources(const struct pci_dev *bridge);
void pci_bus_assign_resources(const struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);


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