#include <linux/slab.h>
#include "pci.h"
-static void pbus_assign_resources_sorted(const struct pci_bus *bus)
+struct resource_list_x {
+ struct resource_list_x *next;
+ struct resource *res;
+ struct pci_dev *dev;
+ resource_size_t start;
+ resource_size_t end;
+ unsigned long flags;
+};
+
+static void add_to_failed_list(struct resource_list_x *head,
+ struct pci_dev *dev, struct resource *res)
+{
+ struct resource_list_x *list = head;
+ struct resource_list_x *ln = list->next;
+ struct resource_list_x *tmp;
+
+ tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+ if (!tmp) {
+ pr_warning("add_to_failed_list: kmalloc() failed!\n");
+ return;
+ }
+
+ tmp->next = ln;
+ tmp->res = res;
+ tmp->dev = dev;
+ tmp->start = res->start;
+ tmp->end = res->end;
+ tmp->flags = res->flags;
+ list->next = tmp;
+}
+
+static void free_failed_list(struct resource_list_x *head)
+{
+ struct resource_list_x *list, *tmp;
+
+ for (list = head->next; list;) {
+ tmp = list;
+ list = list->next;
+ kfree(tmp);
+ }
+
+ head->next = NULL;
+}
+
+static void pbus_assign_resources_sorted(const struct pci_bus *bus,
+ struct resource_list_x *fail_head)
{
struct pci_dev *dev;
struct resource *res;
res = list->res;
idx = res - &list->dev->resource[0];
if (pci_assign_resource(list->dev, idx)) {
+ if (fail_head && !pci_is_root_bus(list->dev->bus))
+ add_to_failed_list(fail_head, list->dev, res);
res->start = 0;
res->end = 0;
res->flags = 0;
config space writes, so it's quite possible that an I/O window of
the bridge will have some undesirable address (e.g. 0) after the
first write. Ditto 64-bit prefetchable MMIO. */
-static void pci_setup_bridge(struct pci_bus *bus)
+static void pci_setup_bridge_io(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
struct resource *res;
struct pci_bus_region region;
- u32 l, bu, lu, io_upper16;
-
- if (pci_is_enabled(bridge))
- return;
-
- dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n",
- bus->secondary, bus->subordinate);
+ u32 l, io_upper16;
/* Set up the top and bottom of the PCI I/O segment for this bus. */
res = bus->resource[0];
/* Set up upper 16 bits of I/O base/limit. */
io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
dev_info(&bridge->dev, " bridge window %pR\n", res);
- }
- else {
+ } else {
/* Clear upper 16 bits of I/O base/limit. */
io_upper16 = 0;
l = 0x00f0;
pci_write_config_dword(bridge, PCI_IO_BASE, l);
/* Update upper 16 bits of I/O base/limit. */
pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
+}
+
+static void pci_setup_bridge_mmio(struct pci_bus *bus)
+{
+ struct pci_dev *bridge = bus->self;
+ struct resource *res;
+ struct pci_bus_region region;
+ u32 l;
- /* Set up the top and bottom of the PCI Memory segment
- for this bus. */
+ /* Set up the top and bottom of the PCI Memory segment for this bus. */
res = bus->resource[1];
pcibios_resource_to_bus(bridge, ®ion, res);
if (res->flags & IORESOURCE_MEM) {
l = (region.start >> 16) & 0xfff0;
l |= region.end & 0xfff00000;
dev_info(&bridge->dev, " bridge window %pR\n", res);
- }
- else {
+ } else {
l = 0x0000fff0;
dev_info(&bridge->dev, " bridge window [mem disabled]\n");
}
pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
+}
+
+static void pci_setup_bridge_mmio_pref(struct pci_bus *bus)
+{
+ struct pci_dev *bridge = bus->self;
+ struct resource *res;
+ struct pci_bus_region region;
+ u32 l, bu, lu;
/* Clear out the upper 32 bits of PREF limit.
If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
lu = upper_32_bits(region.end);
}
dev_info(&bridge->dev, " bridge window %pR\n", res);
- }
- else {
+ } else {
l = 0x0000fff0;
dev_info(&bridge->dev, " bridge window [mem pref disabled]\n");
}
/* Set the upper 32 bits of PREF base & limit. */
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
+}
+
+static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
+{
+ struct pci_dev *bridge = bus->self;
+
+ if (pci_is_enabled(bridge))
+ return;
+
+ dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n",
+ bus->secondary, bus->subordinate);
+
+ if (type & IORESOURCE_IO)
+ pci_setup_bridge_io(bus);
+
+ if (type & IORESOURCE_MEM)
+ pci_setup_bridge_mmio(bus);
+
+ if (type & IORESOURCE_PREFETCH)
+ pci_setup_bridge_mmio_pref(bus);
pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
}
+static void pci_setup_bridge(struct pci_bus *bus)
+{
+ unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+ __pci_setup_bridge(bus, type);
+}
+
/* 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. */
}
EXPORT_SYMBOL(pci_bus_size_bridges);
-void __ref pci_bus_assign_resources(const struct pci_bus *bus)
+static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
+ struct resource_list_x *fail_head)
{
struct pci_bus *b;
struct pci_dev *dev;
- pbus_assign_resources_sorted(bus);
+ pbus_assign_resources_sorted(bus, fail_head);
list_for_each_entry(dev, &bus->devices, bus_list) {
b = dev->subordinate;
if (!b)
continue;
- pci_bus_assign_resources(b);
+ __pci_bus_assign_resources(b, fail_head);
switch (dev->class >> 8) {
case PCI_CLASS_BRIDGE_PCI:
}
}
}
+
+void __ref pci_bus_assign_resources(const struct pci_bus *bus)
+{
+ __pci_bus_assign_resources(bus, NULL);
+}
EXPORT_SYMBOL(pci_bus_assign_resources);
+static void pci_bridge_release_resources(struct pci_bus *bus,
+ unsigned long type)
+{
+ int idx;
+ bool changed = false;
+ struct pci_dev *dev;
+ struct resource *r;
+ unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+ dev = bus->self;
+ for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
+ idx++) {
+ r = &dev->resource[idx];
+ if ((r->flags & type_mask) != type)
+ continue;
+ if (!r->parent)
+ continue;
+ /*
+ * if there are children under that, we should release them
+ * all
+ */
+ release_child_resources(r);
+ if (!release_resource(r)) {
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "resource %d %pR released\n", idx, r);
+ /* keep the old size */
+ r->end = resource_size(r) - 1;
+ r->start = 0;
+ r->flags = 0;
+ changed = true;
+ }
+ }
+
+ if (changed) {
+ /* avoiding touch the one without PREF */
+ if (type & IORESOURCE_PREFETCH)
+ type = IORESOURCE_PREFETCH;
+ __pci_setup_bridge(bus, type);
+ }
+}
+
+enum release_type {
+ leaf_only,
+ whole_subtree,
+};
+/*
+ * try to release pci bridge resources that is from leaf bridge,
+ * so we can allocate big new one later
+ */
+static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,
+ unsigned long type,
+ enum release_type rel_type)
+{
+ struct pci_dev *dev;
+ bool is_leaf_bridge = true;
+
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ struct pci_bus *b = dev->subordinate;
+ if (!b)
+ continue;
+
+ is_leaf_bridge = false;
+
+ if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ continue;
+
+ if (rel_type == whole_subtree)
+ pci_bus_release_bridge_resources(b, type,
+ whole_subtree);
+ }
+
+ if (pci_is_root_bus(bus))
+ return;
+
+ if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ return;
+
+ if ((rel_type == whole_subtree) || is_leaf_bridge)
+ pci_bridge_release_resources(bus, type);
+}
+
static void pci_bus_dump_res(struct pci_bus *bus)
{
int i;
for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
struct resource *res = bus->resource[i];
- if (!res || !res->end)
+
+ if (!res || !res->end || !res->flags)
continue;
dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
projects / mirror_ubuntu-bionic-kernel.git / blobdiff