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setup-bus.c
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/*
* drivers/pci/setup-bus.c
*
* Extruded from code written by
* Dave Rusling ([email protected])
* David Mosberger ([email protected])
* David Miller ([email protected])
*
* Support routines for initializing a PCI subsystem.
*/
/*
* Nov 2000, Ivan Kokshaysky <[email protected]>
* PCI-PCI bridges cleanup, sorted resource allocation.
* Feb 2002, Ivan Kokshaysky <[email protected]>
* Converted to allocation in 3 passes, which gives
* tighter packing. Prefetchable range support.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/cache.h>
#include <linux/slab.h>
#include "pci.h"
struct resource_list_x {
struct resource_list_x *next;
struct resource *res;
struct pci_dev *dev;
resource_size_t start;
resource_size_t end;
resource_size_t add_size;
resource_size_t min_align;
unsigned long flags;
};
#define free_list(type, head) do { \
struct type *list, *tmp; \
for (list = (head)->next; list;) { \
tmp = list; \
list = list->next; \
kfree(tmp); \
} \
(head)->next = NULL; \
} while (0)
int pci_realloc_enable = 0;
#define pci_realloc_enabled() pci_realloc_enable
void pci_realloc(void)
{
pci_realloc_enable = 1;
}
/**
* add_to_list() - add a new resource tracker to the list
* @head: Head of the list
* @dev: device corresponding to which the resource
* belongs
* @res: The resource to be tracked
* @add_size: additional size to be optionally added
* to the resource
*/
static void add_to_list(struct resource_list_x *head,
struct pci_dev *dev, struct resource *res,
resource_size_t add_size, resource_size_t min_align)
{
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_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;
tmp->add_size = add_size;
tmp->min_align = min_align;
list->next = tmp;
}
static void add_to_failed_list(struct resource_list_x *head,
struct pci_dev *dev, struct resource *res)
{
add_to_list(head, dev, res,
0 /* dont care */,
0 /* dont care */);
}
static void __dev_sort_resources(struct pci_dev *dev,
struct resource_list *head)
{
u16 class = dev->class >> 8;
/* 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);
}
static inline void reset_resource(struct resource *res)
{
res->start = 0;
res->end = 0;
res->flags = 0;
}
/**
* reassign_resources_sorted() - satisfy any additional resource requests
*
* @realloc_head : head of the list tracking requests requiring additional
* resources
* @head : head of the list tracking requests with allocated
* resources
*
* Walk through each element of the realloc_head and try to procure
* additional resources for the element, provided the element
* is in the head list.
*/
static void reassign_resources_sorted(struct resource_list_x *realloc_head,
struct resource_list *head)
{
struct resource *res;
struct resource_list_x *list, *tmp, *prev;
struct resource_list *hlist;
resource_size_t add_size;
int idx;
prev = realloc_head;
for (list = realloc_head->next; list;) {
res = list->res;
/* skip resource that has been reset */
if (!res->flags)
goto out;
/* skip this resource if not found in head list */
for (hlist = head->next; hlist && hlist->res != res;
hlist = hlist->next);
if (!hlist) { /* just skip */
prev = list;
list = list->next;
continue;
}
idx = res - &list->dev->resource[0];
add_size=list->add_size;
if (!resource_size(res)) {
res->start = list->start;
res->end = res->start + add_size - 1;
if(pci_assign_resource(list->dev, idx))
reset_resource(res);
} else {
resource_size_t align = list->min_align;
res->flags |= list->flags & (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
if (pci_reassign_resource(list->dev, idx, add_size, align))
dev_printk(KERN_DEBUG, &list->dev->dev, "failed to add optional resources res=%pR\n",
res);
}
out:
tmp = list;
prev->next = list = list->next;
kfree(tmp);
}
}
/**
* assign_requested_resources_sorted() - satisfy resource requests
*
* @head : head of the list tracking requests for resources
* @failed_list : head of the list tracking requests that could
* not be allocated
*
* Satisfy resource requests of each element in the list. Add
* requests that could not satisfied to the failed_list.
*/
static void assign_requested_resources_sorted(struct resource_list *head,
struct resource_list_x *fail_head)
{
struct resource *res;
struct resource_list *list;
int idx;
for (list = head->next; list; list = list->next) {
res = list->res;
idx = res - &list->dev->resource[0];
if (resource_size(res) && pci_assign_resource(list->dev, idx)) {
if (fail_head && !pci_is_root_bus(list->dev->bus)) {
/*
* if the failed res is for ROM BAR, and it will
* be enabled later, don't add it to the list
*/
if (!((idx == PCI_ROM_RESOURCE) &&
(!(res->flags & IORESOURCE_ROM_ENABLE))))
add_to_failed_list(fail_head, list->dev, res);
}
reset_resource(res);
}
}
}
static void __assign_resources_sorted(struct resource_list *head,
struct resource_list_x *realloc_head,
struct resource_list_x *fail_head)
{
/* Satisfy the must-have resource requests */
assign_requested_resources_sorted(head, fail_head);
/* Try to satisfy any additional optional resource
requests */
if (realloc_head)
reassign_resources_sorted(realloc_head, head);
free_list(resource_list, head);
}
static void pdev_assign_resources_sorted(struct pci_dev *dev,
struct resource_list_x *fail_head)
{
struct resource_list head;
head.next = NULL;
__dev_sort_resources(dev, &head);
__assign_resources_sorted(&head, NULL, fail_head);
}
static void pbus_assign_resources_sorted(const struct pci_bus *bus,
struct resource_list_x *realloc_head,
struct resource_list_x *fail_head)
{
struct pci_dev *dev;
struct resource_list head;
head.next = NULL;
list_for_each_entry(dev, &bus->devices, bus_list)
__dev_sort_resources(dev, &head);
__assign_resources_sorted(&head, realloc_head, fail_head);
}
void pci_setup_cardbus(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
struct resource *res;
struct pci_bus_region region;
dev_info(&bridge->dev, "CardBus bridge to [bus %02x-%02x]\n",
bus->secondary, bus->subordinate);
res = bus->resource[0];
pcibios_resource_to_bus(bridge, ®ion, res);
if (res->flags & IORESOURCE_IO) {
/*
* The IO resource is allocated a range twice as large as it
* would normally need. This allows us to set both IO regs.
*/
dev_info(&bridge->dev, " bridge window %pR\n", res);
pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
region.start);
pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
region.end);
}
res = bus->resource[1];
pcibios_resource_to_bus(bridge, ®ion, res);
if (res->flags & IORESOURCE_IO) {
dev_info(&bridge->dev, " bridge window %pR\n", res);
pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
region.start);
pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
region.end);
}
res = bus->resource[2];
pcibios_resource_to_bus(bridge, ®ion, res);
if (res->flags & IORESOURCE_MEM) {
dev_info(&bridge->dev, " bridge window %pR\n", res);
pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
region.start);
pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
region.end);
}
res = bus->resource[3];
pcibios_resource_to_bus(bridge, ®ion, res);
if (res->flags & IORESOURCE_MEM) {
dev_info(&bridge->dev, " bridge window %pR\n", res);
pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
region.start);
pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
region.end);
}
}
EXPORT_SYMBOL(pci_setup_cardbus);
/* Initialize bridges with base/limit values we have collected.
PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
requires that if there is no I/O ports or memory behind the
bridge, corresponding range must be turned off by writing base
value greater than limit to the bridge's base/limit registers.
Note: care must be taken when updating I/O base/limit registers
of bridges which support 32-bit I/O. This update requires two
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_io(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
struct resource *res;
struct pci_bus_region region;
u32 l, io_upper16;
/* Set up the top and bottom of the PCI I/O segment for this bus. */
res = bus->resource[0];
pcibios_resource_to_bus(bridge, ®ion, res);
if (res->flags & IORESOURCE_IO) {
pci_read_config_dword(bridge, PCI_IO_BASE, &l);
l &= 0xffff0000;
l |= (region.start >> 8) & 0x00f0;
l |= region.end & 0xf000;
/* 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 {
/* Clear upper 16 bits of I/O base/limit. */
io_upper16 = 0;
l = 0x00f0;
}
/* Temporarily disable the I/O range before updating PCI_IO_BASE. */
pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
/* Update lower 16 bits of I/O base/limit. */
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. */
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 {
l = 0x0000fff0;
}
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
disables PREF range, which is ok. */
pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
/* Set up PREF base/limit. */
bu = lu = 0;
res = bus->resource[2];
pcibios_resource_to_bus(bridge, ®ion, res);
if (res->flags & IORESOURCE_PREFETCH) {
l = (region.start >> 16) & 0xfff0;
l |= region.end & 0xfff00000;
if (res->flags & IORESOURCE_MEM_64) {
bu = upper_32_bits(region.start);
lu = upper_32_bits(region.end);
}
dev_info(&bridge->dev, " bridge window %pR\n", res);
} else {
l = 0x0000fff0;
}
pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
/* 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;
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);
}
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. */
static void pci_bridge_check_ranges(struct pci_bus *bus)
{
u16 io;
u32 pmem;
struct pci_dev *bridge = bus->self;
struct resource *b_res;
b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
b_res[1].flags |= IORESOURCE_MEM;
pci_read_config_word(bridge, PCI_IO_BASE, &io);
if (!io) {
pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0);
pci_read_config_word(bridge, PCI_IO_BASE, &io);
pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
}
if (io)
b_res[0].flags |= IORESOURCE_IO;
/* DECchip 21050 pass 2 errata: the bridge may miss an address
disconnect boundary by one PCI data phase.
Workaround: do not use prefetching on this device. */
if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
return;
pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
if (!pmem) {
pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
0xfff0fff0);
pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
}
if (pmem) {
b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
PCI_PREF_RANGE_TYPE_64) {
b_res[2].flags |= IORESOURCE_MEM_64;
b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
}
}
/* double check if bridge does support 64 bit pref */
if (b_res[2].flags & IORESOURCE_MEM_64) {
u32 mem_base_hi, tmp;
pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
&mem_base_hi);
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
0xffffffff);
pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
if (!tmp)
b_res[2].flags &= ~IORESOURCE_MEM_64;
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
mem_base_hi);
}
}
/* Helper function for sizing routines: find first available
bus resource of a given type. Note: we intentionally skip
the bus resources which have already been assigned (that is,
have non-NULL parent resource). */
static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
{
int i;
struct resource *r;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;
pci_bus_for_each_resource(bus, r, i) {
if (r == &ioport_resource || r == &iomem_resource)
continue;
if (r && (r->flags & type_mask) == type && !r->parent)
return r;
}
return NULL;
}
static resource_size_t calculate_iosize(resource_size_t size,
resource_size_t min_size,
resource_size_t size1,
resource_size_t old_size,
resource_size_t align)
{
if (size < min_size)
size = min_size;
if (old_size == 1 )
old_size = 0;
/* To be fixed in 2.5: we should have sort of HAVE_ISA
flag in the struct pci_bus. */
#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
size = (size & 0xff) + ((size & ~0xffUL) << 2);
#endif
size = ALIGN(size + size1, align);
if (size < old_size)
size = old_size;
return size;
}
static resource_size_t calculate_memsize(resource_size_t size,
resource_size_t min_size,
resource_size_t size1,
resource_size_t old_size,
resource_size_t align)
{
if (size < min_size)
size = min_size;
if (old_size == 1 )
old_size = 0;
if (size < old_size)
size = old_size;
size = ALIGN(size + size1, align);
return size;
}
static resource_size_t get_res_add_size(struct resource_list_x *realloc_head,
struct resource *res)
{
struct resource_list_x *list;
/* check if it is in realloc_head list */
for (list = realloc_head->next; list && list->res != res;
list = list->next);
if (list)
return list->add_size;
return 0;
}
/**
* pbus_size_io() - size the io window of a given bus
*
* @bus : the bus
* @min_size : the minimum io window that must to be allocated
* @add_size : additional optional io window
* @realloc_head : track the additional io window on this list
*
* Sizing the IO windows of the PCI-PCI bridge is trivial,
* since these windows have 4K granularity and the IO ranges
* of non-bridge PCI devices are limited to 256 bytes.
* We must be careful with the ISA aliasing though.
*/
static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
resource_size_t add_size, struct resource_list_x *realloc_head)
{
struct pci_dev *dev;
struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
unsigned long size = 0, size0 = 0, size1 = 0;
resource_size_t children_add_size = 0;
if (!b_res)
return;
list_for_each_entry(dev, &bus->devices, bus_list) {
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
unsigned long r_size;
if (r->parent || !(r->flags & IORESOURCE_IO))
continue;
r_size = resource_size(r);
if (r_size < 0x400)
/* Might be re-aligned for ISA */
size += r_size;
else
size1 += r_size;
if (realloc_head)
children_add_size += get_res_add_size(realloc_head, r);
}
}
size0 = calculate_iosize(size, min_size, size1,
resource_size(b_res), 4096);
if (children_add_size > add_size)
add_size = children_add_size;
size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
calculate_iosize(size, min_size+add_size, size1,
resource_size(b_res), 4096);
if (!size0 && !size1) {
if (b_res->start || b_res->end)
dev_info(&bus->self->dev, "disabling bridge window "
"%pR to [bus %02x-%02x] (unused)\n", b_res,
bus->secondary, bus->subordinate);
b_res->flags = 0;
return;
}
/* Alignment of the IO window is always 4K */
b_res->start = 4096;
b_res->end = b_res->start + size0 - 1;
b_res->flags |= IORESOURCE_STARTALIGN;
if (size1 > size0 && realloc_head)
add_to_list(realloc_head, bus->self, b_res, size1-size0, 4096);
}
/**
* pbus_size_mem() - size the memory window of a given bus
*
* @bus : the bus
* @min_size : the minimum memory window that must to be allocated
* @add_size : additional optional memory window
* @realloc_head : track the additional memory window on this list
*
* Calculate the size of the bus and minimal alignment which
* guarantees that all child resources fit in this size.
*/
static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
unsigned long type, resource_size_t min_size,
resource_size_t add_size,
struct resource_list_x *realloc_head)
{
struct pci_dev *dev;
resource_size_t min_align, align, size, size0, size1;
resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
int order, max_order;
struct resource *b_res = find_free_bus_resource(bus, type);
unsigned int mem64_mask = 0;
resource_size_t children_add_size = 0;
if (!b_res)
return 0;
memset(aligns, 0, sizeof(aligns));
max_order = 0;
size = 0;
mem64_mask = b_res->flags & IORESOURCE_MEM_64;
b_res->flags &= ~IORESOURCE_MEM_64;
list_for_each_entry(dev, &bus->devices, bus_list) {
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
resource_size_t r_size;
if (r->parent || (r->flags & mask) != type)
continue;
r_size = resource_size(r);
#ifdef CONFIG_PCI_IOV
/* put SRIOV requested res to the optional list */
if (realloc_head && i >= PCI_IOV_RESOURCES &&
i <= PCI_IOV_RESOURCE_END) {
r->end = r->start - 1;
add_to_list(realloc_head, dev, r, r_size, 0/* dont' care */);
children_add_size += r_size;
continue;
}
#endif
/* For bridges size != alignment */
align = pci_resource_alignment(dev, r);
order = __ffs(align) - 20;
if (order > 11) {
dev_warn(&dev->dev, "disabling BAR %d: %pR "
"(bad alignment %#llx)\n", i, r,
(unsigned long long) align);
r->flags = 0;
continue;
}
size += r_size;
if (order < 0)
order = 0;
/* Exclude ranges with size > align from
calculation of the alignment. */
if (r_size == align)
aligns[order] += align;
if (order > max_order)
max_order = order;
mem64_mask &= r->flags & IORESOURCE_MEM_64;
if (realloc_head)
children_add_size += get_res_add_size(realloc_head, r);
}
}
align = 0;
min_align = 0;
for (order = 0; order <= max_order; order++) {
resource_size_t align1 = 1;
align1 <<= (order + 20);
if (!align)
min_align = align1;
else if (ALIGN(align + min_align, min_align) < align1)
min_align = align1 >> 1;
align += aligns[order];
}
size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
if (children_add_size > add_size)
add_size = children_add_size;
size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
calculate_memsize(size, min_size+add_size, 0,
resource_size(b_res), min_align);
if (!size0 && !size1) {
if (b_res->start || b_res->end)
dev_info(&bus->self->dev, "disabling bridge window "
"%pR to [bus %02x-%02x] (unused)\n", b_res,
bus->secondary, bus->subordinate);
b_res->flags = 0;
return 1;
}
b_res->start = min_align;
b_res->end = size0 + min_align - 1;
b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask;
if (size1 > size0 && realloc_head)
add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align);
return 1;
}
unsigned long pci_cardbus_resource_alignment(struct resource *res)
{
if (res->flags & IORESOURCE_IO)
return pci_cardbus_io_size;
if (res->flags & IORESOURCE_MEM)
return pci_cardbus_mem_size;
return 0;
}
static void pci_bus_size_cardbus(struct pci_bus *bus,
struct resource_list_x *realloc_head)
{
struct pci_dev *bridge = bus->self;
struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
u16 ctrl;
/*
* Reserve some resources for CardBus. We reserve
* a fixed amount of bus space for CardBus bridges.
*/
b_res[0].start = 0;
b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
if (realloc_head)
add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size, 0 /* dont care */);
b_res[1].start = 0;
b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
if (realloc_head)
add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size, 0 /* dont care */);
/*
* Check whether prefetchable memory is supported
* by this bridge.
*/
pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
}
/*
* If we have prefetchable memory support, allocate
* two regions. Otherwise, allocate one region of
* twice the size.
*/
if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
b_res[2].start = 0;
b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
if (realloc_head)
add_to_list(realloc_head, bridge, b_res+2, pci_cardbus_mem_size, 0 /* dont care */);
b_res[3].start = 0;
b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
if (realloc_head)
add_to_list(realloc_head, bridge, b_res+3, pci_cardbus_mem_size, 0 /* dont care */);
} else {
b_res[3].start = 0;
b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
if (realloc_head)
add_to_list(realloc_head, bridge, b_res+3, pci_cardbus_mem_size * 2, 0 /* dont care */);
}
/* set the size of the resource to zero, so that the resource does not
* get assigned during required-resource allocation cycle but gets assigned
* during the optional-resource allocation cycle.
*/
b_res[0].start = b_res[1].start = b_res[2].start = b_res[3].start = 1;
b_res[0].end = b_res[1].end = b_res[2].end = b_res[3].end = 0;
}
void __ref __pci_bus_size_bridges(struct pci_bus *bus,
struct resource_list_x *realloc_head)
{
struct pci_dev *dev;
unsigned long mask, prefmask;
resource_size_t additional_mem_size = 0, additional_io_size = 0;
list_for_each_entry(dev, &bus->devices, bus_list) {
struct pci_bus *b = dev->subordinate;
if (!b)
continue;
switch (dev->class >> 8) {
case PCI_CLASS_BRIDGE_CARDBUS:
pci_bus_size_cardbus(b, realloc_head);
break;
case PCI_CLASS_BRIDGE_PCI:
default:
__pci_bus_size_bridges(b, realloc_head);
break;
}
}
/* The root bus? */
if (!bus->self)
return;
switch (bus->self->class >> 8) {
case PCI_CLASS_BRIDGE_CARDBUS:
/* don't size cardbuses yet. */
break;
case PCI_CLASS_BRIDGE_PCI:
pci_bridge_check_ranges(bus);
if (bus->self->is_hotplug_bridge) {
additional_io_size = pci_hotplug_io_size;
additional_mem_size = pci_hotplug_mem_size;
}
/*
* Follow thru
*/
default:
pbus_size_io(bus, 0, additional_io_size, realloc_head);
/* If the bridge supports prefetchable range, size it
separately. If it doesn't, or its prefetchable window
has already been allocated by arch code, try
non-prefetchable range for both types of PCI memory
resources. */
mask = IORESOURCE_MEM;
prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (pbus_size_mem(bus, prefmask, prefmask, 0, additional_mem_size, realloc_head))
mask = prefmask; /* Success, size non-prefetch only. */
else
additional_mem_size += additional_mem_size;
pbus_size_mem(bus, mask, IORESOURCE_MEM, 0, additional_mem_size, realloc_head);
break;
}
}
void __ref pci_bus_size_bridges(struct pci_bus *bus)
{
__pci_bus_size_bridges(bus, NULL);
}
EXPORT_SYMBOL(pci_bus_size_bridges);
static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
struct resource_list_x *realloc_head,
struct resource_list_x *fail_head)
{
struct pci_bus *b;
struct pci_dev *dev;
pbus_assign_resources_sorted(bus, realloc_head, fail_head);
list_for_each_entry(dev, &bus->devices, bus_list) {
b = dev->subordinate;
if (!b)
continue;
__pci_bus_assign_resources(b, realloc_head, fail_head);
switch (dev->class >> 8) {
case PCI_CLASS_BRIDGE_PCI:
if (!pci_is_enabled(dev))
pci_setup_bridge(b);
break;
case PCI_CLASS_BRIDGE_CARDBUS:
pci_setup_cardbus(b);
break;
default:
dev_info(&dev->dev, "not setting up bridge for bus "
"%04x:%02x\n", pci_domain_nr(b), b->number);
break;
}
}
}
void __ref pci_bus_assign_resources(const struct pci_bus *bus)
{
__pci_bus_assign_resources(bus, NULL, NULL);
}
EXPORT_SYMBOL(pci_bus_assign_resources);
static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
struct resource_list_x *fail_head)
{
struct pci_bus *b;
pdev_assign_resources_sorted((struct pci_dev *)bridge, fail_head);
b = bridge->subordinate;
if (!b)
return;
__pci_bus_assign_resources(b, NULL, fail_head);
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;
}
}
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