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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/pci/setup-bus.c

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59 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
* Support routines for initializing a PCI subsystem
*
* Extruded from code written by
* Dave Rusling (david.rusling@reo.mts.dec.com)
* David Mosberger (davidm@cs.arizona.edu)
* David Miller (davem@redhat.com)
*
* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
* PCI-PCI bridges cleanup, sorted resource allocation.
* Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
* 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 <linux/acpi.h>
#include "pci.h"
unsigned int pci_flags;
EXPORT_SYMBOL_GPL(pci_flags);
struct pci_dev_resource {
struct list_head list;
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;
};
static void free_list(struct list_head *head)
{
struct pci_dev_resource *dev_res, *tmp;
list_for_each_entry_safe(dev_res, tmp, head, list) {
list_del(&dev_res->list);
kfree(dev_res);
}
}
/**
* add_to_list() - Add a new resource tracker to the list
* @head: Head of the list
* @dev: Device to which the resource belongs
* @res: Resource to be tracked
* @add_size: Additional size to be optionally added to the resource
* @min_align: Minimum memory window alignment
*/
static int add_to_list(struct list_head *head, struct pci_dev *dev,
struct resource *res, resource_size_t add_size,
resource_size_t min_align)
{
struct pci_dev_resource *tmp;
tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
return -ENOMEM;
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_add(&tmp->list, head);
return 0;
}
static void remove_from_list(struct list_head *head, struct resource *res)
{
struct pci_dev_resource *dev_res, *tmp;
list_for_each_entry_safe(dev_res, tmp, head, list) {
if (dev_res->res == res) {
list_del(&dev_res->list);
kfree(dev_res);
break;
}
}
}
static struct pci_dev_resource *res_to_dev_res(struct list_head *head,
struct resource *res)
{
struct pci_dev_resource *dev_res;
list_for_each_entry(dev_res, head, list) {
if (dev_res->res == res)
return dev_res;
}
return NULL;
}
static resource_size_t get_res_add_size(struct list_head *head,
struct resource *res)
{
struct pci_dev_resource *dev_res;
dev_res = res_to_dev_res(head, res);
return dev_res ? dev_res->add_size : 0;
}
static resource_size_t get_res_add_align(struct list_head *head,
struct resource *res)
{
struct pci_dev_resource *dev_res;
dev_res = res_to_dev_res(head, res);
return dev_res ? dev_res->min_align : 0;
}
/* Sort resources by alignment */
static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
{
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r;
struct pci_dev_resource *dev_res, *tmp;
resource_size_t r_align;
struct list_head *n;
r = &dev->resource[i];
if (r->flags & IORESOURCE_PCI_FIXED)
continue;
if (!(r->flags) || r->parent)
continue;
r_align = pci_resource_alignment(dev, r);
if (!r_align) {
pci_warn(dev, "BAR %d: %pR has bogus alignment\n",
i, r);
continue;
}
tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
panic("%s: kzalloc() failed!\n", __func__);
tmp->res = r;
tmp->dev = dev;
/* Fallback is smallest one or list is empty */
n = head;
list_for_each_entry(dev_res, head, list) {
resource_size_t align;
align = pci_resource_alignment(dev_res->dev,
dev_res->res);
if (r_align > align) {
n = &dev_res->list;
break;
}
}
/* Insert it just before n */
list_add_tail(&tmp->list, n);
}
}
static void __dev_sort_resources(struct pci_dev *dev, struct list_head *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 list_head *realloc_head,
struct list_head *head)
{
struct resource *res;
struct pci_dev_resource *add_res, *tmp;
struct pci_dev_resource *dev_res;
resource_size_t add_size, align;
int idx;
list_for_each_entry_safe(add_res, tmp, realloc_head, list) {
bool found_match = false;
res = add_res->res;
/* Skip resource that has been reset */
if (!res->flags)
goto out;
/* Skip this resource if not found in head list */
list_for_each_entry(dev_res, head, list) {
if (dev_res->res == res) {
found_match = true;
break;
}
}
if (!found_match) /* Just skip */
continue;
idx = res - &add_res->dev->resource[0];
add_size = add_res->add_size;
align = add_res->min_align;
if (!resource_size(res)) {
res->start = align;
res->end = res->start + add_size - 1;
if (pci_assign_resource(add_res->dev, idx))
reset_resource(res);
} else {
res->flags |= add_res->flags &
(IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
if (pci_reassign_resource(add_res->dev, idx,
add_size, align))
pci_info(add_res->dev, "failed to add %llx res[%d]=%pR\n",
(unsigned long long) add_size, idx,
res);
}
out:
list_del(&add_res->list);
kfree(add_res);
}
}
/**
* assign_requested_resources_sorted() - Satisfy resource requests
*
* @head: Head of the list tracking requests for resources
* @fail_head: 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 be satisfied to the failed_list.
*/
static void assign_requested_resources_sorted(struct list_head *head,
struct list_head *fail_head)
{
struct resource *res;
struct pci_dev_resource *dev_res;
int idx;
list_for_each_entry(dev_res, head, list) {
res = dev_res->res;
idx = res - &dev_res->dev->resource[0];
if (resource_size(res) &&
pci_assign_resource(dev_res->dev, idx)) {
if (fail_head) {
/*
* If the failed resource is a 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_list(fail_head,
dev_res->dev, res,
0 /* don't care */,
0 /* don't care */);
}
reset_resource(res);
}
}
}
static unsigned long pci_fail_res_type_mask(struct list_head *fail_head)
{
struct pci_dev_resource *fail_res;
unsigned long mask = 0;
/* Check failed type */
list_for_each_entry(fail_res, fail_head, list)
mask |= fail_res->flags;
/*
* One pref failed resource will set IORESOURCE_MEM, as we can
* allocate pref in non-pref range. Will release all assigned
* non-pref sibling resources according to that bit.
*/
return mask & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH);
}
static bool pci_need_to_release(unsigned long mask, struct resource *res)
{
if (res->flags & IORESOURCE_IO)
return !!(mask & IORESOURCE_IO);
/* Check pref at first */
if (res->flags & IORESOURCE_PREFETCH) {
if (mask & IORESOURCE_PREFETCH)
return true;
/* Count pref if its parent is non-pref */
else if ((mask & IORESOURCE_MEM) &&
!(res->parent->flags & IORESOURCE_PREFETCH))
return true;
else
return false;
}
if (res->flags & IORESOURCE_MEM)
return !!(mask & IORESOURCE_MEM);
return false; /* Should not get here */
}
static void __assign_resources_sorted(struct list_head *head,
struct list_head *realloc_head,
struct list_head *fail_head)
{
/*
* Should not assign requested resources at first. They could be
* adjacent, so later reassign can not reallocate them one by one in
* parent resource window.
*
* Try to assign requested + add_size at beginning. If could do that,
* could get out early. If could not do that, we still try to assign
* requested at first, then try to reassign add_size for some resources.
*
* Separate three resource type checking if we need to release
* assigned resource after requested + add_size try.
*
* 1. If IO port assignment fails, will release assigned IO
* port.
* 2. If pref MMIO assignment fails, release assigned pref
* MMIO. If assigned pref MMIO's parent is non-pref MMIO
* and non-pref MMIO assignment fails, will release that
* assigned pref MMIO.
* 3. If non-pref MMIO assignment fails or pref MMIO
* assignment fails, will release assigned non-pref MMIO.
*/
LIST_HEAD(save_head);
LIST_HEAD(local_fail_head);
struct pci_dev_resource *save_res;
struct pci_dev_resource *dev_res, *tmp_res, *dev_res2;
unsigned long fail_type;
resource_size_t add_align, align;
/* Check if optional add_size is there */
if (!realloc_head || list_empty(realloc_head))
goto requested_and_reassign;
/* Save original start, end, flags etc at first */
list_for_each_entry(dev_res, head, list) {
if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) {
free_list(&save_head);
goto requested_and_reassign;
}
}
/* Update res in head list with add_size in realloc_head list */
list_for_each_entry_safe(dev_res, tmp_res, head, list) {
dev_res->res->end += get_res_add_size(realloc_head,
dev_res->res);
/*
* There are two kinds of additional resources in the list:
* 1. bridge resource -- IORESOURCE_STARTALIGN
* 2. SR-IOV resource -- IORESOURCE_SIZEALIGN
* Here just fix the additional alignment for bridge
*/
if (!(dev_res->res->flags & IORESOURCE_STARTALIGN))
continue;
add_align = get_res_add_align(realloc_head, dev_res->res);
/*
* The "head" list is sorted by alignment so resources with
* bigger alignment will be assigned first. After we
* change the alignment of a dev_res in "head" list, we
* need to reorder the list by alignment to make it
* consistent.
*/
if (add_align > dev_res->res->start) {
resource_size_t r_size = resource_size(dev_res->res);
dev_res->res->start = add_align;
dev_res->res->end = add_align + r_size - 1;
list_for_each_entry(dev_res2, head, list) {
align = pci_resource_alignment(dev_res2->dev,
dev_res2->res);
if (add_align > align) {
list_move_tail(&dev_res->list,
&dev_res2->list);
break;
}
}
}
}
/* Try updated head list with add_size added */
assign_requested_resources_sorted(head, &local_fail_head);
/* All assigned with add_size? */
if (list_empty(&local_fail_head)) {
/* Remove head list from realloc_head list */
list_for_each_entry(dev_res, head, list)
remove_from_list(realloc_head, dev_res->res);
free_list(&save_head);
free_list(head);
return;
}
/* Check failed type */
fail_type = pci_fail_res_type_mask(&local_fail_head);
/* Remove not need to be released assigned res from head list etc */
list_for_each_entry_safe(dev_res, tmp_res, head, list)
if (dev_res->res->parent &&
!pci_need_to_release(fail_type, dev_res->res)) {
/* Remove it from realloc_head list */
remove_from_list(realloc_head, dev_res->res);
remove_from_list(&save_head, dev_res->res);
list_del(&dev_res->list);
kfree(dev_res);
}
free_list(&local_fail_head);
/* Release assigned resource */
list_for_each_entry(dev_res, head, list)
if (dev_res->res->parent)
release_resource(dev_res->res);
/* Restore start/end/flags from saved list */
list_for_each_entry(save_res, &save_head, list) {
struct resource *res = save_res->res;
res->start = save_res->start;
res->end = save_res->end;
res->flags = save_res->flags;
}
free_list(&save_head);
requested_and_reassign:
/* 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(head);
}
static void pdev_assign_resources_sorted(struct pci_dev *dev,
struct list_head *add_head,
struct list_head *fail_head)
{
LIST_HEAD(head);
__dev_sort_resources(dev, &head);
__assign_resources_sorted(&head, add_head, fail_head);
}
static void pbus_assign_resources_sorted(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *fail_head)
{
struct pci_dev *dev;
LIST_HEAD(head);
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;
pci_info(bridge, "CardBus bridge to %pR\n",
&bus->busn_res);
res = bus->resource[0];
pcibios_resource_to_bus(bridge->bus, &region, 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.
*/
pci_info(bridge, " 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->bus, &region, res);
if (res->flags & IORESOURCE_IO) {
pci_info(bridge, " 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->bus, &region, res);
if (res->flags & IORESOURCE_MEM) {
pci_info(bridge, " 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->bus, &region, res);
if (res->flags & IORESOURCE_MEM) {
pci_info(bridge, " 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
* are no I/O ports or memory behind the bridge, the 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_dev *bridge)
{
struct resource *res;
struct pci_bus_region region;
unsigned long io_mask;
u8 io_base_lo, io_limit_lo;
u16 l;
u32 io_upper16;
io_mask = PCI_IO_RANGE_MASK;
if (bridge->io_window_1k)
io_mask = PCI_IO_1K_RANGE_MASK;
/* Set up the top and bottom of the PCI I/O segment for this bus */
res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
pcibios_resource_to_bus(bridge->bus, &region, res);
if (res->flags & IORESOURCE_IO) {
pci_read_config_word(bridge, PCI_IO_BASE, &l);
io_base_lo = (region.start >> 8) & io_mask;
io_limit_lo = (region.end >> 8) & io_mask;
l = ((u16) io_limit_lo << 8) | io_base_lo;
/* Set up upper 16 bits of I/O base/limit */
io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
pci_info(bridge, " 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_word(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_dev *bridge)
{
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 = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
pcibios_resource_to_bus(bridge->bus, &region, res);
if (res->flags & IORESOURCE_MEM) {
l = (region.start >> 16) & 0xfff0;
l |= region.end & 0xfff00000;
pci_info(bridge, " 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_dev *bridge)
{
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 = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
pcibios_resource_to_bus(bridge->bus, &region, 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);
}
pci_info(bridge, " 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;
pci_info(bridge, "PCI bridge to %pR\n",
&bus->busn_res);
if (type & IORESOURCE_IO)
pci_setup_bridge_io(bridge);
if (type & IORESOURCE_MEM)
pci_setup_bridge_mmio(bridge);
if (type & IORESOURCE_PREFETCH)
pci_setup_bridge_mmio_pref(bridge);
pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
}
void __weak pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
{
}
void pci_setup_bridge(struct pci_bus *bus)
{
unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;
pcibios_setup_bridge(bus, type);
__pci_setup_bridge(bus, type);
}
int pci_claim_bridge_resource(struct pci_dev *bridge, int i)
{
if (i < PCI_BRIDGE_RESOURCES || i > PCI_BRIDGE_RESOURCE_END)
return 0;
if (pci_claim_resource(bridge, i) == 0)
return 0; /* Claimed the window */
if ((bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI)
return 0;
if (!pci_bus_clip_resource(bridge, i))
return -EINVAL; /* Clipping didn't change anything */
switch (i) {
case PCI_BRIDGE_IO_WINDOW:
pci_setup_bridge_io(bridge);
break;
case PCI_BRIDGE_MEM_WINDOW:
pci_setup_bridge_mmio(bridge);
break;
case PCI_BRIDGE_PREF_MEM_WINDOW:
pci_setup_bridge_mmio_pref(bridge);
break;
default:
return -EINVAL;
}
if (pci_claim_resource(bridge, i) == 0)
return 0; /* Claimed a smaller window */
return -EINVAL;
}
/*
* 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)
{
struct pci_dev *bridge = bus->self;
struct resource *b_res;
b_res = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
b_res->flags |= IORESOURCE_MEM;
if (bridge->io_window) {
b_res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
b_res->flags |= IORESOURCE_IO;
}
if (bridge->pref_window) {
b_res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
b_res->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (bridge->pref_64_window) {
b_res->flags |= IORESOURCE_MEM_64 |
PCI_PREF_RANGE_TYPE_64;
}
}
}
/*
* Helper function for sizing routines. Assigned resources have non-NULL
* parent resource.
*
* Return first unassigned resource of the correct type. If there is none,
* return first assigned resource of the correct type. If none of the
* above, return NULL.
*
* Returning an assigned resource of the correct type allows the caller to
* distinguish between already assigned and no resource of the correct type.
*/
static struct resource *find_bus_resource_of_type(struct pci_bus *bus,
unsigned long type_mask,
unsigned long type)
{
struct resource *r, *r_assigned = NULL;
int i;
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;
if (r && (r->flags & type_mask) == type && !r_assigned)
r_assigned = r;
}
return r_assigned;
}
static resource_size_t calculate_iosize(resource_size_t size,
resource_size_t min_size,
resource_size_t size1,
resource_size_t add_size,
resource_size_t children_add_size,
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 = size + size1;
if (size < old_size)
size = old_size;
size = ALIGN(max(size, add_size) + children_add_size, align);
return size;
}
static resource_size_t calculate_memsize(resource_size_t size,
resource_size_t min_size,
resource_size_t add_size,
resource_size_t children_add_size,
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(max(size, add_size) + children_add_size, align);
return size;
}
resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus,
unsigned long type)
{
return 1;
}
#define PCI_P2P_DEFAULT_MEM_ALIGN 0x100000 /* 1MiB */
#define PCI_P2P_DEFAULT_IO_ALIGN 0x1000 /* 4KiB */
#define PCI_P2P_DEFAULT_IO_ALIGN_1K 0x400 /* 1KiB */
static resource_size_t window_alignment(struct pci_bus *bus, unsigned long type)
{
resource_size_t align = 1, arch_align;
if (type & IORESOURCE_MEM)
align = PCI_P2P_DEFAULT_MEM_ALIGN;
else if (type & IORESOURCE_IO) {
/*
* Per spec, I/O windows are 4K-aligned, but some bridges have
* an extension to support 1K alignment.
*/
if (bus->self && bus->self->io_window_1k)
align = PCI_P2P_DEFAULT_IO_ALIGN_1K;
else
align = PCI_P2P_DEFAULT_IO_ALIGN;
}
arch_align = pcibios_window_alignment(bus, type);
return max(align, arch_align);
}
/**
* pbus_size_io() - Size the I/O window of a given bus
*
* @bus: The bus
* @min_size: The minimum I/O window that must be allocated
* @add_size: Additional optional I/O window
* @realloc_head: Track the additional I/O window on this list
*
* Sizing the I/O windows of the PCI-PCI bridge is trivial, since these
* windows have 1K or 4K granularity and the I/O 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 list_head *realloc_head)
{
struct pci_dev *dev;
struct resource *b_res = find_bus_resource_of_type(bus, IORESOURCE_IO,
IORESOURCE_IO);
resource_size_t size = 0, size0 = 0, size1 = 0;
resource_size_t children_add_size = 0;
resource_size_t min_align, align;
if (!b_res)
return;
/* If resource is already assigned, nothing more to do */
if (b_res->parent)
return;
min_align = window_alignment(bus, IORESOURCE_IO);
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;
align = pci_resource_alignment(dev, r);
if (align > min_align)
min_align = align;
if (realloc_head)
children_add_size += get_res_add_size(realloc_head, r);
}
}
size0 = calculate_iosize(size, min_size, size1, 0, 0,
resource_size(b_res), min_align);
size1 = (!realloc_head || (realloc_head && !add_size && !children_add_size)) ? size0 :
calculate_iosize(size, min_size, size1, add_size, children_add_size,
resource_size(b_res), min_align);
if (!size0 && !size1) {
if (bus->self && (b_res->start || b_res->end))
pci_info(bus->self, "disabling bridge window %pR to %pR (unused)\n",
b_res, &bus->busn_res);
b_res->flags = 0;
return;
}
b_res->start = min_align;
b_res->end = b_res->start + size0 - 1;
b_res->flags |= IORESOURCE_STARTALIGN;
if (bus->self && size1 > size0 && realloc_head) {
add_to_list(realloc_head, bus->self, b_res, size1-size0,
min_align);
pci_info(bus->self, "bridge window %pR to %pR add_size %llx\n",
b_res, &bus->busn_res,
(unsigned long long) size1 - size0);
}
}
static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
int max_order)
{
resource_size_t align = 0;
resource_size_t min_align = 0;
int order;
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];
}
return min_align;
}
/**
* pbus_size_mem() - Size the memory window of a given bus
*
* @bus: The bus
* @mask: Mask the resource flag, then compare it with type
* @type: The type of free resource from bridge
* @type2: Second match type
* @type3: Third match type
* @min_size: The minimum memory window that must 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.
*
* Return -ENOSPC if there's no available bus resource of the desired
* type. Otherwise, set the bus resource start/end to indicate the
* required size, add things to realloc_head (if supplied), and return 0.
*/
static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
unsigned long type, unsigned long type2,
unsigned long type3, resource_size_t min_size,
resource_size_t add_size,
struct list_head *realloc_head)
{
struct pci_dev *dev;
resource_size_t min_align, align, size, size0, size1;
resource_size_t aligns[24]; /* Alignments from 1MB to 8TB */
int order, max_order;
struct resource *b_res = find_bus_resource_of_type(bus,
mask | IORESOURCE_PREFETCH, type);
resource_size_t children_add_size = 0;
resource_size_t children_add_align = 0;
resource_size_t add_align = 0;
if (!b_res)
return -ENOSPC;
/* If resource is already assigned, nothing more to do */
if (b_res->parent)
return 0;
memset(aligns, 0, sizeof(aligns));
max_order = 0;
size = 0;
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 & IORESOURCE_PCI_FIXED) ||
((r->flags & mask) != type &&
(r->flags & mask) != type2 &&
(r->flags & mask) != type3))
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) {
add_align = max(pci_resource_alignment(dev, r), add_align);
r->end = r->start - 1;
add_to_list(realloc_head, dev, r, r_size, 0 /* Don't care */);
children_add_size += r_size;
continue;
}
#endif
/*
* aligns[0] is for 1MB (since bridge memory
* windows are always at least 1MB aligned), so
* keep "order" from being negative for smaller
* resources.
*/
align = pci_resource_alignment(dev, r);
order = __ffs(align) - 20;
if (order < 0)
order = 0;
if (order >= ARRAY_SIZE(aligns)) {
pci_warn(dev, "disabling BAR %d: %pR (bad alignment %#llx)\n",
i, r, (unsigned long long) align);
r->flags = 0;
continue;
}
size += max(r_size, align);
/*
* Exclude ranges with size > align from calculation of
* the alignment.
*/
if (r_size <= align)
aligns[order] += align;
if (order > max_order)
max_order = order;
if (realloc_head) {
children_add_size += get_res_add_size(realloc_head, r);
children_add_align = get_res_add_align(realloc_head, r);
add_align = max(add_align, children_add_align);
}
}
}
min_align = calculate_mem_align(aligns, max_order);
min_align = max(min_align, window_alignment(bus, b_res->flags));
size0 = calculate_memsize(size, min_size, 0, 0, resource_size(b_res), min_align);
add_align = max(min_align, add_align);
size1 = (!realloc_head || (realloc_head && !add_size && !children_add_size)) ? size0 :
calculate_memsize(size, min_size, add_size, children_add_size,
resource_size(b_res), add_align);
if (!size0 && !size1) {
if (bus->self && (b_res->start || b_res->end))
pci_info(bus->self, "disabling bridge window %pR to %pR (unused)\n",
b_res, &bus->busn_res);
b_res->flags = 0;
return 0;
}
b_res->start = min_align;
b_res->end = size0 + min_align - 1;
b_res->flags |= IORESOURCE_STARTALIGN;
if (bus->self && size1 > size0 && realloc_head) {
add_to_list(realloc_head, bus->self, b_res, size1-size0, add_align);
pci_info(bus->self, "bridge window %pR to %pR add_size %llx add_align %llx\n",
b_res, &bus->busn_res,
(unsigned long long) (size1 - size0),
(unsigned long long) add_align);
}
return 0;
}
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 list_head *realloc_head)
{
struct pci_dev *bridge = bus->self;
struct resource *b_res;
resource_size_t b_res_3_size = pci_cardbus_mem_size * 2;
u16 ctrl;
b_res = &bridge->resource[PCI_CB_BRIDGE_IO_0_WINDOW];
if (b_res->parent)
goto handle_b_res_1;
/*
* Reserve some resources for CardBus. We reserve a fixed amount
* of bus space for CardBus bridges.
*/
b_res->start = pci_cardbus_io_size;
b_res->end = b_res->start + pci_cardbus_io_size - 1;
b_res->flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
if (realloc_head) {
b_res->end -= pci_cardbus_io_size;
add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size,
pci_cardbus_io_size);
}
handle_b_res_1:
b_res = &bridge->resource[PCI_CB_BRIDGE_IO_1_WINDOW];
if (b_res->parent)
goto handle_b_res_2;
b_res->start = pci_cardbus_io_size;
b_res->end = b_res->start + pci_cardbus_io_size - 1;
b_res->flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
if (realloc_head) {
b_res->end -= pci_cardbus_io_size;
add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size,
pci_cardbus_io_size);
}
handle_b_res_2:
/* MEM1 must not be pref MMIO */
pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) {
ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
}
/* 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);
}
b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_0_WINDOW];
if (b_res->parent)
goto handle_b_res_3;
/*
* 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->start = pci_cardbus_mem_size;
b_res->end = b_res->start + pci_cardbus_mem_size - 1;
b_res->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
IORESOURCE_STARTALIGN;
if (realloc_head) {
b_res->end -= pci_cardbus_mem_size;
add_to_list(realloc_head, bridge, b_res,
pci_cardbus_mem_size, pci_cardbus_mem_size);
}
/* Reduce that to half */
b_res_3_size = pci_cardbus_mem_size;
}
handle_b_res_3:
b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_1_WINDOW];
if (b_res->parent)
goto handle_done;
b_res->start = pci_cardbus_mem_size;
b_res->end = b_res->start + b_res_3_size - 1;
b_res->flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
if (realloc_head) {
b_res->end -= b_res_3_size;
add_to_list(realloc_head, bridge, b_res, b_res_3_size,
pci_cardbus_mem_size);
}
handle_done:
;
}
void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
{
struct pci_dev *dev;
unsigned long mask, prefmask, type2 = 0, type3 = 0;
resource_size_t additional_io_size = 0, additional_mmio_size = 0,
additional_mmio_pref_size = 0;
struct resource *pref;
struct pci_host_bridge *host;
int hdr_type, i, ret;
list_for_each_entry(dev, &bus->devices, bus_list) {
struct pci_bus *b = dev->subordinate;
if (!b)
continue;
switch (dev->hdr_type) {
case PCI_HEADER_TYPE_CARDBUS:
pci_bus_size_cardbus(b, realloc_head);
break;
case PCI_HEADER_TYPE_BRIDGE:
default:
__pci_bus_size_bridges(b, realloc_head);
break;
}
}
/* The root bus? */
if (pci_is_root_bus(bus)) {
host = to_pci_host_bridge(bus->bridge);
if (!host->size_windows)
return;
pci_bus_for_each_resource(bus, pref, i)
if (pref && (pref->flags & IORESOURCE_PREFETCH))
break;
hdr_type = -1; /* Intentionally invalid - not a PCI device. */
} else {
pref = &bus->self->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
hdr_type = bus->self->hdr_type;
}
switch (hdr_type) {
case PCI_HEADER_TYPE_CARDBUS:
/* Don't size CardBuses yet */
break;
case PCI_HEADER_TYPE_BRIDGE:
pci_bridge_check_ranges(bus);
if (bus->self->is_hotplug_bridge) {
additional_io_size = pci_hotplug_io_size;
additional_mmio_size = pci_hotplug_mmio_size;
additional_mmio_pref_size = pci_hotplug_mmio_pref_size;
}
fallthrough;
default:
pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
additional_io_size, realloc_head);
/*
* If there's a 64-bit prefetchable MMIO window, compute
* the size required to put all 64-bit prefetchable
* resources in it.
*/
mask = IORESOURCE_MEM;
prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (pref && (pref->flags & IORESOURCE_MEM_64)) {
prefmask |= IORESOURCE_MEM_64;
ret = pbus_size_mem(bus, prefmask, prefmask,
prefmask, prefmask,
realloc_head ? 0 : additional_mmio_pref_size,
additional_mmio_pref_size, realloc_head);
/*
* If successful, all non-prefetchable resources
* and any 32-bit prefetchable resources will go in
* the non-prefetchable window.
*/
if (ret == 0) {
mask = prefmask;
type2 = prefmask & ~IORESOURCE_MEM_64;
type3 = prefmask & ~IORESOURCE_PREFETCH;
}
}
/*
* If there is no 64-bit prefetchable window, compute the
* size required to put all prefetchable resources in the
* 32-bit prefetchable window (if there is one).
*/
if (!type2) {
prefmask &= ~IORESOURCE_MEM_64;
ret = pbus_size_mem(bus, prefmask, prefmask,
prefmask, prefmask,
realloc_head ? 0 : additional_mmio_pref_size,
additional_mmio_pref_size, realloc_head);
/*
* If successful, only non-prefetchable resources
* will go in the non-prefetchable window.
*/
if (ret == 0)
mask = prefmask;
else
additional_mmio_size += additional_mmio_pref_size;
type2 = type3 = IORESOURCE_MEM;
}
/*
* Compute the size required to put everything else in the
* non-prefetchable window. This includes:
*
* - all non-prefetchable resources
* - 32-bit prefetchable resources if there's a 64-bit
* prefetchable window or no prefetchable window at all
* - 64-bit prefetchable resources if there's no prefetchable
* window at all
*
* Note that the strategy in __pci_assign_resource() must match
* that used here. Specifically, we cannot put a 32-bit
* prefetchable resource in a 64-bit prefetchable window.
*/
pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3,
realloc_head ? 0 : additional_mmio_size,
additional_mmio_size, realloc_head);
break;
}
}
void pci_bus_size_bridges(struct pci_bus *bus)
{
__pci_bus_size_bridges(bus, NULL);
}
EXPORT_SYMBOL(pci_bus_size_bridges);
static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
{
int i;
struct resource *parent_r;
unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;
pci_bus_for_each_resource(b, parent_r, i) {
if (!parent_r)
continue;
if ((r->flags & mask) == (parent_r->flags & mask) &&
resource_contains(parent_r, r))
request_resource(parent_r, r);
}
}
/*
* Try to assign any resources marked as IORESOURCE_PCI_FIXED, as they are
* skipped by pbus_assign_resources_sorted().
*/
static void pdev_assign_fixed_resources(struct pci_dev *dev)
{
int i;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct pci_bus *b;
struct resource *r = &dev->resource[i];
if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
continue;
b = dev->bus;
while (b && !r->parent) {
assign_fixed_resource_on_bus(b, r);
b = b->parent;
}
}
}
void __pci_bus_assign_resources(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *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) {
pdev_assign_fixed_resources(dev);
b = dev->subordinate;
if (!b)
continue;
__pci_bus_assign_resources(b, realloc_head, fail_head);
switch (dev->hdr_type) {
case PCI_HEADER_TYPE_BRIDGE:
if (!pci_is_enabled(dev))
pci_setup_bridge(b);
break;
case PCI_HEADER_TYPE_CARDBUS:
pci_setup_cardbus(b);
break;
default:
pci_info(dev, "not setting up bridge for bus %04x:%02x\n",
pci_domain_nr(b), b->number);
break;
}
}
}
void pci_bus_assign_resources(const struct pci_bus *bus)
{
__pci_bus_assign_resources(bus, NULL, NULL);
}
EXPORT_SYMBOL(pci_bus_assign_resources);
static void pci_claim_device_resources(struct pci_dev *dev)
{
int i;
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
if (!r->flags || r->parent)
continue;
pci_claim_resource(dev, i);
}
}
static void pci_claim_bridge_resources(struct pci_dev *dev)
{
int i;
for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
if (!r->flags || r->parent)
continue;
pci_claim_bridge_resource(dev, i);
}
}
static void pci_bus_allocate_dev_resources(struct pci_bus *b)
{
struct pci_dev *dev;
struct pci_bus *child;
list_for_each_entry(dev, &b->devices, bus_list) {
pci_claim_device_resources(dev);
child = dev->subordinate;
if (child)
pci_bus_allocate_dev_resources(child);
}
}
static void pci_bus_allocate_resources(struct pci_bus *b)
{
struct pci_bus *child;
/*
* Carry out a depth-first search on the PCI bus tree to allocate
* bridge apertures. Read the programmed bridge bases and
* recursively claim the respective bridge resources.
*/
if (b->self) {
pci_read_bridge_bases(b);
pci_claim_bridge_resources(b->self);
}
list_for_each_entry(child, &b->children, node)
pci_bus_allocate_resources(child);
}
void pci_bus_claim_resources(struct pci_bus *b)
{
pci_bus_allocate_resources(b);
pci_bus_allocate_dev_resources(b);
}
EXPORT_SYMBOL(pci_bus_claim_resources);
static void __pci_bridge_assign_resources(const struct pci_dev *bridge,
struct list_head *add_head,
struct list_head *fail_head)
{
struct pci_bus *b;
pdev_assign_resources_sorted((struct pci_dev *)bridge,
add_head, fail_head);
b = bridge->subordinate;
if (!b)
return;
__pci_bus_assign_resources(b, add_head, 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:
pci_info(bridge, "not setting up bridge for bus %04x:%02x\n",
pci_domain_nr(b), b->number);
break;
}
}
#define PCI_RES_TYPE_MASK \
(IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH |\
IORESOURCE_MEM_64)
static void pci_bridge_release_resources(struct pci_bus *bus,
unsigned long type)
{
struct pci_dev *dev = bus->self;
struct resource *r;
unsigned int old_flags;
struct resource *b_res;
int idx = 1;
b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
/*
* 1. If IO port assignment fails, release bridge IO port.
* 2. If non pref MMIO assignment fails, release bridge nonpref MMIO.
* 3. If 64bit pref MMIO assignment fails, and bridge pref is 64bit,
* release bridge pref MMIO.
* 4. If pref MMIO assignment fails, and bridge pref is 32bit,
* release bridge pref MMIO.
* 5. If pref MMIO assignment fails, and bridge pref is not
* assigned, release bridge nonpref MMIO.
*/
if (type & IORESOURCE_IO)
idx = 0;
else if (!(type & IORESOURCE_PREFETCH))
idx = 1;
else if ((type & IORESOURCE_MEM_64) &&
(b_res[2].flags & IORESOURCE_MEM_64))
idx = 2;
else if (!(b_res[2].flags & IORESOURCE_MEM_64) &&
(b_res[2].flags & IORESOURCE_PREFETCH))
idx = 2;
else
idx = 1;
r = &b_res[idx];
if (!r->parent)
return;
/* If there are children, release them all */
release_child_resources(r);
if (!release_resource(r)) {
type = old_flags = r->flags & PCI_RES_TYPE_MASK;
pci_info(dev, "resource %d %pR released\n",
PCI_BRIDGE_RESOURCES + idx, r);
/* Keep the old size */
r->end = resource_size(r) - 1;
r->start = 0;
r->flags = 0;
/* Avoiding touch the one without PREF */
if (type & IORESOURCE_PREFETCH)
type = IORESOURCE_PREFETCH;
__pci_setup_bridge(bus, type);
/* For next child res under same bridge */
r->flags = old_flags;
}
}
enum release_type {
leaf_only,
whole_subtree,
};
/*
* Try to release PCI bridge resources from leaf bridge, so we can allocate
* a larger window later.
*/
static void 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)
{
struct resource *res;
int i;
pci_bus_for_each_resource(bus, res, i) {
if (!res || !res->end || !res->flags)
continue;
dev_info(&bus->dev, "resource %d %pR\n", i, res);
}
}
static void pci_bus_dump_resources(struct pci_bus *bus)
{
struct pci_bus *b;
struct pci_dev *dev;
pci_bus_dump_res(bus);
list_for_each_entry(dev, &bus->devices, bus_list) {
b = dev->subordinate;
if (!b)
continue;
pci_bus_dump_resources(b);
}
}
static int pci_bus_get_depth(struct pci_bus *bus)
{
int depth = 0;
struct pci_bus *child_bus;
list_for_each_entry(child_bus, &bus->children, node) {
int ret;
ret = pci_bus_get_depth(child_bus);
if (ret + 1 > depth)
depth = ret + 1;
}
return depth;
}
/*
* -1: undefined, will auto detect later
* 0: disabled by user
* 1: disabled by auto detect
* 2: enabled by user
* 3: enabled by auto detect
*/
enum enable_type {
undefined = -1,
user_disabled,
auto_disabled,
user_enabled,
auto_enabled,
};
static enum enable_type pci_realloc_enable = undefined;
void __init pci_realloc_get_opt(char *str)
{
if (!strncmp(str, "off", 3))
pci_realloc_enable = user_disabled;
else if (!strncmp(str, "on", 2))
pci_realloc_enable = user_enabled;
}
static bool pci_realloc_enabled(enum enable_type enable)
{
return enable >= user_enabled;
}
#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
static int iov_resources_unassigned(struct pci_dev *dev, void *data)
{
int i;
bool *unassigned = data;
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
struct resource *r = &dev->resource[i + PCI_IOV_RESOURCES];
struct pci_bus_region region;
/* Not assigned or rejected by kernel? */
if (!r->flags)
continue;
pcibios_resource_to_bus(dev->bus, &region, r);
if (!region.start) {
*unassigned = true;
return 1; /* Return early from pci_walk_bus() */
}
}
return 0;
}
static enum enable_type pci_realloc_detect(struct pci_bus *bus,
enum enable_type enable_local)
{
bool unassigned = false;
struct pci_host_bridge *host;
if (enable_local != undefined)
return enable_local;
host = pci_find_host_bridge(bus);
if (host->preserve_config)
return auto_disabled;
pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
if (unassigned)
return auto_enabled;
return enable_local;
}
#else
static enum enable_type pci_realloc_detect(struct pci_bus *bus,
enum enable_type enable_local)
{
return enable_local;
}
#endif
/*
* First try will not touch PCI bridge res.
* Second and later try will clear small leaf bridge res.
* Will stop till to the max depth if can not find good one.
*/
void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
{
LIST_HEAD(realloc_head);
/* List of resources that want additional resources */
struct list_head *add_list = NULL;
int tried_times = 0;
enum release_type rel_type = leaf_only;
LIST_HEAD(fail_head);
struct pci_dev_resource *fail_res;
int pci_try_num = 1;
enum enable_type enable_local;
/* Don't realloc if asked to do so */
enable_local = pci_realloc_detect(bus, pci_realloc_enable);
if (pci_realloc_enabled(enable_local)) {
int max_depth = pci_bus_get_depth(bus);
pci_try_num = max_depth + 1;
dev_info(&bus->dev, "max bus depth: %d pci_try_num: %d\n",
max_depth, pci_try_num);
}
again:
/*
* Last try will use add_list, otherwise will try good to have as must
* have, so can realloc parent bridge resource
*/
if (tried_times + 1 == pci_try_num)
add_list = &realloc_head;
/*
* Depth first, calculate sizes and alignments of all subordinate buses.
*/
__pci_bus_size_bridges(bus, add_list);
/* Depth last, allocate resources and update the hardware. */
__pci_bus_assign_resources(bus, add_list, &fail_head);
if (add_list)
BUG_ON(!list_empty(add_list));
tried_times++;
/* Any device complain? */
if (list_empty(&fail_head))
goto dump;
if (tried_times >= pci_try_num) {
if (enable_local == undefined)
dev_info(&bus->dev, "Some PCI device resources are unassigned, try booting with pci=realloc\n");
else if (enable_local == auto_enabled)
dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
free_list(&fail_head);
goto dump;
}
dev_info(&bus->dev, "No. %d try to assign unassigned res\n",
tried_times + 1);
/* Third times and later will not check if it is leaf */
if ((tried_times + 1) > 2)
rel_type = whole_subtree;
/*
* Try to release leaf bridge's resources that doesn't fit resource of
* child device under that bridge.
*/
list_for_each_entry(fail_res, &fail_head, list)
pci_bus_release_bridge_resources(fail_res->dev->bus,
fail_res->flags & PCI_RES_TYPE_MASK,
rel_type);
/* Restore size and flags */
list_for_each_entry(fail_res, &fail_head, list) {
struct resource *res = fail_res->res;
int idx;
res->start = fail_res->start;
res->end = fail_res->end;
res->flags = fail_res->flags;
if (pci_is_bridge(fail_res->dev)) {
idx = res - &fail_res->dev->resource[0];
if (idx >= PCI_BRIDGE_RESOURCES &&
idx <= PCI_BRIDGE_RESOURCE_END)
res->flags = 0;
}
}
free_list(&fail_head);
goto again;
dump:
/* Dump the resource on buses */
pci_bus_dump_resources(bus);
}
void __init pci_assign_unassigned_resources(void)
{
struct pci_bus *root_bus;
list_for_each_entry(root_bus, &pci_root_buses, node) {
pci_assign_unassigned_root_bus_resources(root_bus);
/* Make sure the root bridge has a companion ACPI device */
if (ACPI_HANDLE(root_bus->bridge))
acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
}
}
static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
struct list_head *add_list,
resource_size_t new_size)
{
resource_size_t add_size, size = resource_size(res);
if (res->parent)
return;
if (!new_size)
return;
if (new_size > size) {
add_size = new_size - size;
pci_dbg(bridge, "bridge window %pR extended by %pa\n", res,
&add_size);
} else if (new_size < size) {
add_size = size - new_size;
pci_dbg(bridge, "bridge window %pR shrunken by %pa\n", res,
&add_size);
}
res->end = res->start + new_size - 1;
remove_from_list(add_list, res);
}
static void pci_bus_distribute_available_resources(struct pci_bus *bus,
struct list_head *add_list,
struct resource io,
struct resource mmio,
struct resource mmio_pref)
{
unsigned int normal_bridges = 0, hotplug_bridges = 0;
struct resource *io_res, *mmio_res, *mmio_pref_res;
struct pci_dev *dev, *bridge = bus->self;
resource_size_t io_per_hp, mmio_per_hp, mmio_pref_per_hp, align;
io_res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
mmio_res = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
mmio_pref_res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
/*
* The alignment of this bridge is yet to be considered, hence it must
* be done now before extending its bridge window.
*/
align = pci_resource_alignment(bridge, io_res);
if (!io_res->parent && align)
io.start = min(ALIGN(io.start, align), io.end + 1);
align = pci_resource_alignment(bridge, mmio_res);
if (!mmio_res->parent && align)
mmio.start = min(ALIGN(mmio.start, align), mmio.end + 1);
align = pci_resource_alignment(bridge, mmio_pref_res);
if (!mmio_pref_res->parent && align)
mmio_pref.start = min(ALIGN(mmio_pref.start, align),
mmio_pref.end + 1);
/*
* Now that we have adjusted for alignment, update the bridge window
* resources to fill as much remaining resource space as possible.
*/
adjust_bridge_window(bridge, io_res, add_list, resource_size(&io));
adjust_bridge_window(bridge, mmio_res, add_list, resource_size(&mmio));
adjust_bridge_window(bridge, mmio_pref_res, add_list,
resource_size(&mmio_pref));
/*
* Calculate how many hotplug bridges and normal bridges there
* are on this bus. We will distribute the additional available
* resources between hotplug bridges.
*/
for_each_pci_bridge(dev, bus) {
if (dev->is_hotplug_bridge)
hotplug_bridges++;
else
normal_bridges++;
}
/*
* There is only one bridge on the bus so it gets all available
* resources which it can then distribute to the possible hotplug
* bridges below.
*/
if (hotplug_bridges + normal_bridges == 1) {
dev = list_first_entry(&bus->devices, struct pci_dev, bus_list);
if (dev->subordinate)
pci_bus_distribute_available_resources(dev->subordinate,
add_list, io, mmio, mmio_pref);
return;
}
if (hotplug_bridges == 0)
return;
/*
* Calculate the total amount of extra resource space we can
* pass to bridges below this one. This is basically the
* extra space reduced by the minimal required space for the
* non-hotplug bridges.
*/
for_each_pci_bridge(dev, bus) {
resource_size_t used_size;
struct resource *res;
if (dev->is_hotplug_bridge)
continue;
/*
* Reduce the available resource space by what the
* bridge and devices below it occupy.
*/
res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
align = pci_resource_alignment(dev, res);
align = align ? ALIGN(io.start, align) - io.start : 0;
used_size = align + resource_size(res);
if (!res->parent)
io.start = min(io.start + used_size, io.end + 1);
res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
align = pci_resource_alignment(dev, res);
align = align ? ALIGN(mmio.start, align) - mmio.start : 0;
used_size = align + resource_size(res);
if (!res->parent)
mmio.start = min(mmio.start + used_size, mmio.end + 1);
res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
align = pci_resource_alignment(dev, res);
align = align ? ALIGN(mmio_pref.start, align) -
mmio_pref.start : 0;
used_size = align + resource_size(res);
if (!res->parent)
mmio_pref.start = min(mmio_pref.start + used_size,
mmio_pref.end + 1);
}
io_per_hp = div64_ul(resource_size(&io), hotplug_bridges);
mmio_per_hp = div64_ul(resource_size(&mmio), hotplug_bridges);
mmio_pref_per_hp = div64_ul(resource_size(&mmio_pref),
hotplug_bridges);
/*
* Go over devices on this bus and distribute the remaining
* resource space between hotplug bridges.
*/
for_each_pci_bridge(dev, bus) {
struct pci_bus *b;
b = dev->subordinate;
if (!b || !dev->is_hotplug_bridge)
continue;
/*
* Distribute available extra resources equally between
* hotplug-capable downstream ports taking alignment into
* account.
*/
io.end = io.start + io_per_hp - 1;
mmio.end = mmio.start + mmio_per_hp - 1;
mmio_pref.end = mmio_pref.start + mmio_pref_per_hp - 1;
pci_bus_distribute_available_resources(b, add_list, io, mmio,
mmio_pref);
io.start += io_per_hp;
mmio.start += mmio_per_hp;
mmio_pref.start += mmio_pref_per_hp;
}
}
static void pci_bridge_distribute_available_resources(struct pci_dev *bridge,
struct list_head *add_list)
{
struct resource available_io, available_mmio, available_mmio_pref;
if (!bridge->is_hotplug_bridge)
return;
/* Take the initial extra resources from the hotplug port */
available_io = bridge->resource[PCI_BRIDGE_IO_WINDOW];
available_mmio = bridge->resource[PCI_BRIDGE_MEM_WINDOW];
available_mmio_pref = bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
pci_bus_distribute_available_resources(bridge->subordinate,
add_list, available_io,
available_mmio,
available_mmio_pref);
}
void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
{
struct pci_bus *parent = bridge->subordinate;
/* List of resources that want additional resources */
LIST_HEAD(add_list);
int tried_times = 0;
LIST_HEAD(fail_head);
struct pci_dev_resource *fail_res;
int retval;
again:
__pci_bus_size_bridges(parent, &add_list);
/*
* Distribute remaining resources (if any) equally between hotplug
* bridges below. This makes it possible to extend the hierarchy
* later without running out of resources.
*/
pci_bridge_distribute_available_resources(bridge, &add_list);
__pci_bridge_assign_resources(bridge, &add_list, &fail_head);
BUG_ON(!list_empty(&add_list));
tried_times++;
if (list_empty(&fail_head))
goto enable_all;
if (tried_times >= 2) {
/* Still fail, don't need to try more */
free_list(&fail_head);
goto enable_all;
}
printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
tried_times + 1);
/*
* Try to release leaf bridge's resources that aren't big enough
* to contain child device resources.
*/
list_for_each_entry(fail_res, &fail_head, list)
pci_bus_release_bridge_resources(fail_res->dev->bus,
fail_res->flags & PCI_RES_TYPE_MASK,
whole_subtree);
/* Restore size and flags */
list_for_each_entry(fail_res, &fail_head, list) {
struct resource *res = fail_res->res;
int idx;
res->start = fail_res->start;
res->end = fail_res->end;
res->flags = fail_res->flags;
if (pci_is_bridge(fail_res->dev)) {
idx = res - &fail_res->dev->resource[0];
if (idx >= PCI_BRIDGE_RESOURCES &&
idx <= PCI_BRIDGE_RESOURCE_END)
res->flags = 0;
}
}
free_list(&fail_head);
goto again;
enable_all:
retval = pci_reenable_device(bridge);
if (retval)
pci_err(bridge, "Error reenabling bridge (%d)\n", retval);
pci_set_master(bridge);
}
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;
down_read(&pci_bus_sem);
/* 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;
pci_info(bridge, "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)) {
up_read(&pci_bus_sem);
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);
up_read(&pci_bus_sem);
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);
up_read(&pci_bus_sem);
return ret;
}
void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
{
struct pci_dev *dev;
/* List of resources that want additional resources */
LIST_HEAD(add_list);
down_read(&pci_bus_sem);
for_each_pci_bridge(dev, bus)
if (pci_has_subordinate(dev))
__pci_bus_size_bridges(dev->subordinate, &add_list);
up_read(&pci_bus_sem);
__pci_bus_assign_resources(bus, &add_list, NULL);
BUG_ON(!list_empty(&add_list));
}
EXPORT_SYMBOL_GPL(pci_assign_unassigned_bus_resources);
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