summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--drivers/pci/setup-bus.c98
-rw-r--r--drivers/pci/setup-res.c58
-rw-r--r--include/linux/pci.h3
3 files changed, 159 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 73dda0d59bbc..6826a893288a 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1913,6 +1913,104 @@ enable_all:
}
EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
+int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type)
+{
+ struct pci_dev_resource *dev_res;
+ struct pci_dev *next;
+ LIST_HEAD(saved);
+ LIST_HEAD(added);
+ LIST_HEAD(failed);
+ unsigned int i;
+ int ret;
+
+ /* Walk to the root hub, releasing bridge BARs when possible */
+ next = bridge;
+ do {
+ bridge = next;
+ for (i = PCI_BRIDGE_RESOURCES; i < PCI_BRIDGE_RESOURCE_END;
+ i++) {
+ struct resource *res = &bridge->resource[i];
+
+ if ((res->flags ^ type) & PCI_RES_TYPE_MASK)
+ continue;
+
+ /* Ignore BARs which are still in use */
+ if (res->child)
+ continue;
+
+ ret = add_to_list(&saved, bridge, res, 0, 0);
+ if (ret)
+ goto cleanup;
+
+ dev_info(&bridge->dev, "BAR %d: releasing %pR\n",
+ i, res);
+
+ if (res->parent)
+ release_resource(res);
+ res->start = 0;
+ res->end = 0;
+ break;
+ }
+ if (i == PCI_BRIDGE_RESOURCE_END)
+ break;
+
+ next = bridge->bus ? bridge->bus->self : NULL;
+ } while (next);
+
+ if (list_empty(&saved))
+ return -ENOENT;
+
+ __pci_bus_size_bridges(bridge->subordinate, &added);
+ __pci_bridge_assign_resources(bridge, &added, &failed);
+ BUG_ON(!list_empty(&added));
+
+ if (!list_empty(&failed)) {
+ ret = -ENOSPC;
+ goto cleanup;
+ }
+
+ list_for_each_entry(dev_res, &saved, list) {
+ /* Skip the bridge we just assigned resources for. */
+ if (bridge == dev_res->dev)
+ continue;
+
+ bridge = dev_res->dev;
+ pci_setup_bridge(bridge->subordinate);
+ }
+
+ free_list(&saved);
+ return 0;
+
+cleanup:
+ /* restore size and flags */
+ list_for_each_entry(dev_res, &failed, list) {
+ struct resource *res = dev_res->res;
+
+ res->start = dev_res->start;
+ res->end = dev_res->end;
+ res->flags = dev_res->flags;
+ }
+ free_list(&failed);
+
+ /* Revert to the old configuration */
+ list_for_each_entry(dev_res, &saved, list) {
+ struct resource *res = dev_res->res;
+
+ bridge = dev_res->dev;
+ i = res - bridge->resource;
+
+ res->start = dev_res->start;
+ res->end = dev_res->end;
+ res->flags = dev_res->flags;
+
+ pci_claim_resource(bridge, i);
+ pci_setup_bridge(bridge->subordinate);
+ }
+ free_list(&saved);
+
+ return ret;
+}
+
void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
{
struct pci_dev *dev;
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index e576e1a8d978..bf0089ef2177 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -396,6 +396,64 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsiz
return 0;
}
+void pci_release_resource(struct pci_dev *dev, int resno)
+{
+ struct resource *res = dev->resource + resno;
+
+ dev_info(&dev->dev, "BAR %d: releasing %pR\n", resno, res);
+ release_resource(res);
+ res->end = resource_size(res) - 1;
+ res->start = 0;
+ res->flags |= IORESOURCE_UNSET;
+}
+EXPORT_SYMBOL(pci_release_resource);
+
+int pci_resize_resource(struct pci_dev *dev, int resno, int size)
+{
+ struct resource *res = dev->resource + resno;
+ int old, ret;
+ u32 sizes;
+ u16 cmd;
+
+ /* Make sure the resource isn't assigned before resizing it. */
+ if (!(res->flags & IORESOURCE_UNSET))
+ return -EBUSY;
+
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+ if (cmd & PCI_COMMAND_MEMORY)
+ return -EBUSY;
+
+ sizes = pci_rebar_get_possible_sizes(dev, resno);
+ if (!sizes)
+ return -ENOTSUPP;
+
+ if (!(sizes & BIT(size)))
+ return -EINVAL;
+
+ old = pci_rebar_get_current_size(dev, resno);
+ if (old < 0)
+ return old;
+
+ ret = pci_rebar_set_size(dev, resno, size);
+ if (ret)
+ return ret;
+
+ res->end = res->start + pci_rebar_size_to_bytes(size) - 1;
+
+ /* Check if the new config works by trying to assign everything. */
+ ret = pci_reassign_bridge_resources(dev->bus->self, res->flags);
+ if (ret)
+ goto error_resize;
+
+ return 0;
+
+error_resize:
+ pci_rebar_set_size(dev, resno, old);
+ res->end = res->start + pci_rebar_size_to_bytes(old) - 1;
+ return ret;
+}
+EXPORT_SYMBOL(pci_resize_resource);
+
int pci_enable_resources(struct pci_dev *dev, int mask)
{
u16 cmd, old_cmd;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index f4f8ee5a7362..55e9fe6dd577 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1106,6 +1106,8 @@ void pci_reset_bridge_secondary_bus(struct pci_dev *dev);
void pci_update_resource(struct pci_dev *dev, int resno);
int __must_check pci_assign_resource(struct pci_dev *dev, int i);
int __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align);
+void pci_release_resource(struct pci_dev *dev, int resno);
+int __must_check pci_resize_resource(struct pci_dev *dev, int i, int size);
int pci_select_bars(struct pci_dev *dev, unsigned long flags);
bool pci_device_is_present(struct pci_dev *pdev);
void pci_ignore_hotplug(struct pci_dev *dev);
@@ -1185,6 +1187,7 @@ void pci_assign_unassigned_resources(void);
void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
void pci_assign_unassigned_bus_resources(struct pci_bus *bus);
void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus);
+int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type);
void pdev_enable_device(struct pci_dev *);
int pci_enable_resources(struct pci_dev *, int mask);
void pci_assign_irq(struct pci_dev *dev);