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linux-next/drivers/pci/hotplug/ibmphp_res.c
Gustavo A. R. Silva df561f6688 treewide: Use fallthrough pseudo-keyword 
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00

2120 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* IBM Hot Plug Controller Driver
*
* Written By: Irene Zubarev, IBM Corporation
*
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001,2002 IBM Corp.
*
* All rights reserved.
*
* Send feedback to <gregkh@us.ibm.com>
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/init.h>
#include "ibmphp.h"
static int flags = 0; /* for testing */
static void update_resources(struct bus_node *bus_cur, int type, int rangeno);
static int once_over(void);
static int remove_ranges(struct bus_node *, struct bus_node *);
static int update_bridge_ranges(struct bus_node **);
static int add_bus_range(int type, struct range_node *, struct bus_node *);
static void fix_resources(struct bus_node *);
static struct bus_node *find_bus_wprev(u8, struct bus_node **, u8);
static LIST_HEAD(gbuses);
static struct bus_node * __init alloc_error_bus(struct ebda_pci_rsrc *curr, u8 busno, int flag)
{
struct bus_node *newbus;
if (!(curr) && !(flag)) {
err("NULL pointer passed\n");
return NULL;
}
newbus = kzalloc(sizeof(struct bus_node), GFP_KERNEL);
if (!newbus)
return NULL;
if (flag)
newbus->busno = busno;
else
newbus->busno = curr->bus_num;
list_add_tail(&newbus->bus_list, &gbuses);
return newbus;
}
static struct resource_node * __init alloc_resources(struct ebda_pci_rsrc *curr)
{
struct resource_node *rs;
if (!curr) {
err("NULL passed to allocate\n");
return NULL;
}
rs = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!rs)
return NULL;
rs->busno = curr->bus_num;
rs->devfunc = curr->dev_fun;
rs->start = curr->start_addr;
rs->end = curr->end_addr;
rs->len = curr->end_addr - curr->start_addr + 1;
return rs;
}
static int __init alloc_bus_range(struct bus_node **new_bus, struct range_node **new_range, struct ebda_pci_rsrc *curr, int flag, u8 first_bus)
{
struct bus_node *newbus;
struct range_node *newrange;
u8 num_ranges = 0;
if (first_bus) {
newbus = kzalloc(sizeof(struct bus_node), GFP_KERNEL);
if (!newbus)
return -ENOMEM;
newbus->busno = curr->bus_num;
} else {
newbus = *new_bus;
switch (flag) {
case MEM:
num_ranges = newbus->noMemRanges;
break;
case PFMEM:
num_ranges = newbus->noPFMemRanges;
break;
case IO:
num_ranges = newbus->noIORanges;
break;
}
}
newrange = kzalloc(sizeof(struct range_node), GFP_KERNEL);
if (!newrange) {
if (first_bus)
kfree(newbus);
return -ENOMEM;
}
newrange->start = curr->start_addr;
newrange->end = curr->end_addr;
if (first_bus || (!num_ranges))
newrange->rangeno = 1;
else {
/* need to insert our range */
add_bus_range(flag, newrange, newbus);
debug("%d resource Primary Bus inserted on bus %x [%x - %x]\n", flag, newbus->busno, newrange->start, newrange->end);
}
switch (flag) {
case MEM:
newbus->rangeMem = newrange;
if (first_bus)
newbus->noMemRanges = 1;
else {
debug("First Memory Primary on bus %x, [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
++newbus->noMemRanges;
fix_resources(newbus);
}
break;
case IO:
newbus->rangeIO = newrange;
if (first_bus)
newbus->noIORanges = 1;
else {
debug("First IO Primary on bus %x, [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
++newbus->noIORanges;
fix_resources(newbus);
}
break;
case PFMEM:
newbus->rangePFMem = newrange;
if (first_bus)
newbus->noPFMemRanges = 1;
else {
debug("1st PFMemory Primary on Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
++newbus->noPFMemRanges;
fix_resources(newbus);
}
break;
}
*new_bus = newbus;
*new_range = newrange;
return 0;
}
/* Notes:
* 1. The ranges are ordered. The buses are not ordered. (First come)
*
* 2. If cannot allocate out of PFMem range, allocate from Mem ranges. PFmemFromMem
* are not sorted. (no need since use mem node). To not change the entire code, we
* also add mem node whenever this case happens so as not to change
* ibmphp_check_mem_resource etc(and since it really is taking Mem resource)
*/
/*****************************************************************************
* This is the Resource Management initialization function. It will go through
* the Resource list taken from EBDA and fill in this module's data structures
*
* THIS IS NOT TAKING INTO CONSIDERATION IO RESTRICTIONS OF PRIMARY BUSES,
* SINCE WE'RE GOING TO ASSUME FOR NOW WE DON'T HAVE THOSE ON OUR BUSES FOR NOW
*
* Input: ptr to the head of the resource list from EBDA
* Output: 0, -1 or error codes
***************************************************************************/
int __init ibmphp_rsrc_init(void)
{
struct ebda_pci_rsrc *curr;
struct range_node *newrange = NULL;
struct bus_node *newbus = NULL;
struct bus_node *bus_cur;
struct bus_node *bus_prev;
struct resource_node *new_io = NULL;
struct resource_node *new_mem = NULL;
struct resource_node *new_pfmem = NULL;
int rc;
list_for_each_entry(curr, &ibmphp_ebda_pci_rsrc_head,
ebda_pci_rsrc_list) {
if (!(curr->rsrc_type & PCIDEVMASK)) {
/* EBDA still lists non PCI devices, so ignore... */
debug("this is not a PCI DEVICE in rsrc_init, please take care\n");
// continue;
}
/* this is a primary bus resource */
if (curr->rsrc_type & PRIMARYBUSMASK) {
/* memory */
if ((curr->rsrc_type & RESTYPE) == MMASK) {
/* no bus structure exists in place yet */
if (list_empty(&gbuses)) {
rc = alloc_bus_range(&newbus, &newrange, curr, MEM, 1);
if (rc)
return rc;
list_add_tail(&newbus->bus_list, &gbuses);
debug("gbuses = NULL, Memory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
} else {
bus_cur = find_bus_wprev(curr->bus_num, &bus_prev, 1);
/* found our bus */
if (bus_cur) {
rc = alloc_bus_range(&bus_cur, &newrange, curr, MEM, 0);
if (rc)
return rc;
} else {
/* went through all the buses and didn't find ours, need to create a new bus node */
rc = alloc_bus_range(&newbus, &newrange, curr, MEM, 1);
if (rc)
return rc;
list_add_tail(&newbus->bus_list, &gbuses);
debug("New Bus, Memory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
}
}
} else if ((curr->rsrc_type & RESTYPE) == PFMASK) {
/* prefetchable memory */
if (list_empty(&gbuses)) {
/* no bus structure exists in place yet */
rc = alloc_bus_range(&newbus, &newrange, curr, PFMEM, 1);
if (rc)
return rc;
list_add_tail(&newbus->bus_list, &gbuses);
debug("gbuses = NULL, PFMemory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
} else {
bus_cur = find_bus_wprev(curr->bus_num, &bus_prev, 1);
if (bus_cur) {
/* found our bus */
rc = alloc_bus_range(&bus_cur, &newrange, curr, PFMEM, 0);
if (rc)
return rc;
} else {
/* went through all the buses and didn't find ours, need to create a new bus node */
rc = alloc_bus_range(&newbus, &newrange, curr, PFMEM, 1);
if (rc)
return rc;
list_add_tail(&newbus->bus_list, &gbuses);
debug("1st Bus, PFMemory Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
}
}
} else if ((curr->rsrc_type & RESTYPE) == IOMASK) {
/* IO */
if (list_empty(&gbuses)) {
/* no bus structure exists in place yet */
rc = alloc_bus_range(&newbus, &newrange, curr, IO, 1);
if (rc)
return rc;
list_add_tail(&newbus->bus_list, &gbuses);
debug("gbuses = NULL, IO Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
} else {
bus_cur = find_bus_wprev(curr->bus_num, &bus_prev, 1);
if (bus_cur) {
rc = alloc_bus_range(&bus_cur, &newrange, curr, IO, 0);
if (rc)
return rc;
} else {
/* went through all the buses and didn't find ours, need to create a new bus node */
rc = alloc_bus_range(&newbus, &newrange, curr, IO, 1);
if (rc)
return rc;
list_add_tail(&newbus->bus_list, &gbuses);
debug("1st Bus, IO Primary Bus %x [%x - %x]\n", newbus->busno, newrange->start, newrange->end);
}
}
} else {
; /* type is reserved WHAT TO DO IN THIS CASE???
NOTHING TO DO??? */
}
} else {
/* regular pci device resource */
if ((curr->rsrc_type & RESTYPE) == MMASK) {
/* Memory resource */
new_mem = alloc_resources(curr);
if (!new_mem)
return -ENOMEM;
new_mem->type = MEM;
/*
* if it didn't find the bus, means PCI dev
* came b4 the Primary Bus info, so need to
* create a bus rangeno becomes a problem...
* assign a -1 and then update once the range
* actually appears...
*/
if (ibmphp_add_resource(new_mem) < 0) {
newbus = alloc_error_bus(curr, 0, 0);
if (!newbus)
return -ENOMEM;
newbus->firstMem = new_mem;
++newbus->needMemUpdate;
new_mem->rangeno = -1;
}
debug("Memory resource for device %x, bus %x, [%x - %x]\n", new_mem->devfunc, new_mem->busno, new_mem->start, new_mem->end);
} else if ((curr->rsrc_type & RESTYPE) == PFMASK) {
/* PFMemory resource */
new_pfmem = alloc_resources(curr);
if (!new_pfmem)
return -ENOMEM;
new_pfmem->type = PFMEM;
new_pfmem->fromMem = 0;
if (ibmphp_add_resource(new_pfmem) < 0) {
newbus = alloc_error_bus(curr, 0, 0);
if (!newbus)
return -ENOMEM;
newbus->firstPFMem = new_pfmem;
++newbus->needPFMemUpdate;
new_pfmem->rangeno = -1;
}
debug("PFMemory resource for device %x, bus %x, [%x - %x]\n", new_pfmem->devfunc, new_pfmem->busno, new_pfmem->start, new_pfmem->end);
} else if ((curr->rsrc_type & RESTYPE) == IOMASK) {
/* IO resource */
new_io = alloc_resources(curr);
if (!new_io)
return -ENOMEM;
new_io->type = IO;
/*
* if it didn't find the bus, means PCI dev
* came b4 the Primary Bus info, so need to
* create a bus rangeno becomes a problem...
* Can assign a -1 and then update once the
* range actually appears...
*/
if (ibmphp_add_resource(new_io) < 0) {
newbus = alloc_error_bus(curr, 0, 0);
if (!newbus)
return -ENOMEM;
newbus->firstIO = new_io;
++newbus->needIOUpdate;
new_io->rangeno = -1;
}
debug("IO resource for device %x, bus %x, [%x - %x]\n", new_io->devfunc, new_io->busno, new_io->start, new_io->end);
}
}
}
list_for_each_entry(bus_cur, &gbuses, bus_list) {
/* This is to get info about PPB resources, since EBDA doesn't put this info into the primary bus info */
rc = update_bridge_ranges(&bus_cur);
if (rc)
return rc;
}
return once_over(); /* This is to align ranges (so no -1) */
}
/********************************************************************************
* This function adds a range into a sorted list of ranges per bus for a particular
* range type, it then calls another routine to update the range numbers on the
* pci devices' resources for the appropriate resource
*
* Input: type of the resource, range to add, current bus
* Output: 0 or -1, bus and range ptrs
********************************************************************************/
static int add_bus_range(int type, struct range_node *range, struct bus_node *bus_cur)
{
struct range_node *range_cur = NULL;
struct range_node *range_prev;
int count = 0, i_init;
int noRanges = 0;
switch (type) {
case MEM:
range_cur = bus_cur->rangeMem;
noRanges = bus_cur->noMemRanges;
break;
case PFMEM:
range_cur = bus_cur->rangePFMem;
noRanges = bus_cur->noPFMemRanges;
break;
case IO:
range_cur = bus_cur->rangeIO;
noRanges = bus_cur->noIORanges;
break;
}
range_prev = NULL;
while (range_cur) {
if (range->start < range_cur->start)
break;
range_prev = range_cur;
range_cur = range_cur->next;
count = count + 1;
}
if (!count) {
/* our range will go at the beginning of the list */
switch (type) {
case MEM:
bus_cur->rangeMem = range;
break;
case PFMEM:
bus_cur->rangePFMem = range;
break;
case IO:
bus_cur->rangeIO = range;
break;
}
range->next = range_cur;
range->rangeno = 1;
i_init = 0;
} else if (!range_cur) {
/* our range will go at the end of the list */
range->next = NULL;
range_prev->next = range;
range->rangeno = range_prev->rangeno + 1;
return 0;
} else {
/* the range is in the middle */
range_prev->next = range;
range->next = range_cur;
range->rangeno = range_cur->rangeno;
i_init = range_prev->rangeno;
}
for (count = i_init; count < noRanges; ++count) {
++range_cur->rangeno;
range_cur = range_cur->next;
}
update_resources(bus_cur, type, i_init + 1);
return 0;
}
/*******************************************************************************
* This routine goes through the list of resources of type 'type' and updates
* the range numbers that they correspond to. It was called from add_bus_range fnc
*
* Input: bus, type of the resource, the rangeno starting from which to update
******************************************************************************/
static void update_resources(struct bus_node *bus_cur, int type, int rangeno)
{
struct resource_node *res = NULL;
u8 eol = 0; /* end of list indicator */
switch (type) {
case MEM:
if (bus_cur->firstMem)
res = bus_cur->firstMem;
break;
case PFMEM:
if (bus_cur->firstPFMem)
res = bus_cur->firstPFMem;
break;
case IO:
if (bus_cur->firstIO)
res = bus_cur->firstIO;
break;
}
if (res) {
while (res) {
if (res->rangeno == rangeno)
break;
if (res->next)
res = res->next;
else if (res->nextRange)
res = res->nextRange;
else {
eol = 1;
break;
}
}
if (!eol) {
/* found the range */
while (res) {
++res->rangeno;
res = res->next;
}
}
}
}
static void fix_me(struct resource_node *res, struct bus_node *bus_cur, struct range_node *range)
{
char *str = "";
switch (res->type) {
case IO:
str = "io";
break;
case MEM:
str = "mem";
break;
case PFMEM:
str = "pfmem";
break;
}
while (res) {
if (res->rangeno == -1) {
while (range) {
if ((res->start >= range->start) && (res->end <= range->end)) {
res->rangeno = range->rangeno;
debug("%s->rangeno in fix_resources is %d\n", str, res->rangeno);
switch (res->type) {
case IO:
--bus_cur->needIOUpdate;
break;
case MEM:
--bus_cur->needMemUpdate;
break;
case PFMEM:
--bus_cur->needPFMemUpdate;
break;
}
break;
}
range = range->next;
}
}
if (res->next)
res = res->next;
else
res = res->nextRange;
}
}
/*****************************************************************************
* This routine reassigns the range numbers to the resources that had a -1
* This case can happen only if upon initialization, resources taken by pci dev
* appear in EBDA before the resources allocated for that bus, since we don't
* know the range, we assign -1, and this routine is called after a new range
* is assigned to see the resources with unknown range belong to the added range
*
* Input: current bus
* Output: none, list of resources for that bus are fixed if can be
*******************************************************************************/
static void fix_resources(struct bus_node *bus_cur)
{
struct range_node *range;
struct resource_node *res;
debug("%s - bus_cur->busno = %d\n", __func__, bus_cur->busno);
if (bus_cur->needIOUpdate) {
res = bus_cur->firstIO;
range = bus_cur->rangeIO;
fix_me(res, bus_cur, range);
}
if (bus_cur->needMemUpdate) {
res = bus_cur->firstMem;
range = bus_cur->rangeMem;
fix_me(res, bus_cur, range);
}
if (bus_cur->needPFMemUpdate) {
res = bus_cur->firstPFMem;
range = bus_cur->rangePFMem;
fix_me(res, bus_cur, range);
}
}
/*******************************************************************************
* This routine adds a resource to the list of resources to the appropriate bus
* based on their resource type and sorted by their starting addresses. It assigns
* the ptrs to next and nextRange if needed.
*
* Input: resource ptr
* Output: ptrs assigned (to the node)
* 0 or -1
*******************************************************************************/
int ibmphp_add_resource(struct resource_node *res)
{
struct resource_node *res_cur;
struct resource_node *res_prev;
struct bus_node *bus_cur;
struct range_node *range_cur = NULL;
struct resource_node *res_start = NULL;
debug("%s - enter\n", __func__);
if (!res) {
err("NULL passed to add\n");
return -ENODEV;
}
bus_cur = find_bus_wprev(res->busno, NULL, 0);
if (!bus_cur) {
/* didn't find a bus, something's wrong!!! */
debug("no bus in the system, either pci_dev's wrong or allocation failed\n");
return -ENODEV;
}
/* Normal case */
switch (res->type) {
case IO:
range_cur = bus_cur->rangeIO;
res_start = bus_cur->firstIO;
break;
case MEM:
range_cur = bus_cur->rangeMem;
res_start = bus_cur->firstMem;
break;
case PFMEM:
range_cur = bus_cur->rangePFMem;
res_start = bus_cur->firstPFMem;
break;
default:
err("cannot read the type of the resource to add... problem\n");
return -EINVAL;
}
while (range_cur) {
if ((res->start >= range_cur->start) && (res->end <= range_cur->end)) {
res->rangeno = range_cur->rangeno;
break;
}
range_cur = range_cur->next;
}
/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
* this is again the case of rangeno = -1
* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*/
if (!range_cur) {
switch (res->type) {
case IO:
++bus_cur->needIOUpdate;
break;
case MEM:
++bus_cur->needMemUpdate;
break;
case PFMEM:
++bus_cur->needPFMemUpdate;
break;
}
res->rangeno = -1;
}
debug("The range is %d\n", res->rangeno);
if (!res_start) {
/* no first{IO,Mem,Pfmem} on the bus, 1st IO/Mem/Pfmem resource ever */
switch (res->type) {
case IO:
bus_cur->firstIO = res;
break;
case MEM:
bus_cur->firstMem = res;
break;
case PFMEM:
bus_cur->firstPFMem = res;
break;
}
res->next = NULL;
res->nextRange = NULL;
} else {
res_cur = res_start;
res_prev = NULL;
debug("res_cur->rangeno is %d\n", res_cur->rangeno);
while (res_cur) {
if (res_cur->rangeno >= res->rangeno)
break;
res_prev = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
}
if (!res_cur) {
/* at the end of the resource list */
debug("i should be here, [%x - %x]\n", res->start, res->end);
res_prev->nextRange = res;
res->next = NULL;
res->nextRange = NULL;
} else if (res_cur->rangeno == res->rangeno) {
/* in the same range */
while (res_cur) {
if (res->start < res_cur->start)
break;
res_prev = res_cur;
res_cur = res_cur->next;
}
if (!res_cur) {
/* the last resource in this range */
res_prev->next = res;
res->next = NULL;
res->nextRange = res_prev->nextRange;
res_prev->nextRange = NULL;
} else if (res->start < res_cur->start) {
/* at the beginning or middle of the range */
if (!res_prev) {
switch (res->type) {
case IO:
bus_cur->firstIO = res;
break;
case MEM:
bus_cur->firstMem = res;
break;
case PFMEM:
bus_cur->firstPFMem = res;
break;
}
} else if (res_prev->rangeno == res_cur->rangeno)
res_prev->next = res;
else
res_prev->nextRange = res;
res->next = res_cur;
res->nextRange = NULL;
}
} else {
/* this is the case where it is 1st occurrence of the range */
if (!res_prev) {
/* at the beginning of the resource list */
res->next = NULL;
switch (res->type) {
case IO:
res->nextRange = bus_cur->firstIO;
bus_cur->firstIO = res;
break;
case MEM:
res->nextRange = bus_cur->firstMem;
bus_cur->firstMem = res;
break;
case PFMEM:
res->nextRange = bus_cur->firstPFMem;
bus_cur->firstPFMem = res;
break;
}
} else if (res_cur->rangeno > res->rangeno) {
/* in the middle of the resource list */
res_prev->nextRange = res;
res->next = NULL;
res->nextRange = res_cur;
}
}
}
debug("%s - exit\n", __func__);
return 0;
}
/****************************************************************************
* This routine will remove the resource from the list of resources
*
* Input: io, mem, and/or pfmem resource to be deleted
* Output: modified resource list
* 0 or error code
****************************************************************************/
int ibmphp_remove_resource(struct resource_node *res)
{
struct bus_node *bus_cur;
struct resource_node *res_cur = NULL;
struct resource_node *res_prev;
struct resource_node *mem_cur;
char *type = "";
if (!res) {
err("resource to remove is NULL\n");
return -ENODEV;
}
bus_cur = find_bus_wprev(res->busno, NULL, 0);
if (!bus_cur) {
err("cannot find corresponding bus of the io resource to remove bailing out...\n");
return -ENODEV;
}
switch (res->type) {
case IO:
res_cur = bus_cur->firstIO;
type = "io";
break;
case MEM:
res_cur = bus_cur->firstMem;
type = "mem";
break;
case PFMEM:
res_cur = bus_cur->firstPFMem;
type = "pfmem";
break;
default:
err("unknown type for resource to remove\n");
return -EINVAL;
}
res_prev = NULL;
while (res_cur) {
if ((res_cur->start == res->start) && (res_cur->end == res->end))
break;
res_prev = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
}
if (!res_cur) {
if (res->type == PFMEM) {
/*
* case where pfmem might be in the PFMemFromMem list
* so will also need to remove the corresponding mem
* entry
*/
res_cur = bus_cur->firstPFMemFromMem;
res_prev = NULL;
while (res_cur) {
if ((res_cur->start == res->start) && (res_cur->end == res->end)) {
mem_cur = bus_cur->firstMem;
while (mem_cur) {
if ((mem_cur->start == res_cur->start)
&& (mem_cur->end == res_cur->end))
break;
if (mem_cur->next)
mem_cur = mem_cur->next;
else
mem_cur = mem_cur->nextRange;
}
if (!mem_cur) {
err("cannot find corresponding mem node for pfmem...\n");
return -EINVAL;
}
ibmphp_remove_resource(mem_cur);
if (!res_prev)
bus_cur->firstPFMemFromMem = res_cur->next;
else
res_prev->next = res_cur->next;
kfree(res_cur);
return 0;
}
res_prev = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
}
if (!res_cur) {
err("cannot find pfmem to delete...\n");
return -EINVAL;
}
} else {
err("the %s resource is not in the list to be deleted...\n", type);
return -EINVAL;
}
}
if (!res_prev) {
/* first device to be deleted */
if (res_cur->next) {
switch (res->type) {
case IO:
bus_cur->firstIO = res_cur->next;
break;
case MEM:
bus_cur->firstMem = res_cur->next;
break;
case PFMEM:
bus_cur->firstPFMem = res_cur->next;
break;
}
} else if (res_cur->nextRange) {
switch (res->type) {
case IO:
bus_cur->firstIO = res_cur->nextRange;
break;
case MEM:
bus_cur->firstMem = res_cur->nextRange;
break;
case PFMEM:
bus_cur->firstPFMem = res_cur->nextRange;
break;
}
} else {
switch (res->type) {
case IO:
bus_cur->firstIO = NULL;
break;
case MEM:
bus_cur->firstMem = NULL;
break;
case PFMEM:
bus_cur->firstPFMem = NULL;
break;
}
}
kfree(res_cur);
return 0;
} else {
if (res_cur->next) {
if (res_prev->rangeno == res_cur->rangeno)
res_prev->next = res_cur->next;
else
res_prev->nextRange = res_cur->next;
} else if (res_cur->nextRange) {
res_prev->next = NULL;
res_prev->nextRange = res_cur->nextRange;
} else {
res_prev->next = NULL;
res_prev->nextRange = NULL;
}
kfree(res_cur);
return 0;
}
return 0;
}
static struct range_node *find_range(struct bus_node *bus_cur, struct resource_node *res)
{
struct range_node *range = NULL;
switch (res->type) {
case IO:
range = bus_cur->rangeIO;
break;
case MEM:
range = bus_cur->rangeMem;
break;
case PFMEM:
range = bus_cur->rangePFMem;
break;
default:
err("cannot read resource type in find_range\n");
}
while (range) {
if (res->rangeno == range->rangeno)
break;
range = range->next;
}
return range;
}
/*****************************************************************************
* This routine will check to make sure the io/mem/pfmem->len that the device asked for
* can fit w/i our list of available IO/MEM/PFMEM resources. If cannot, returns -EINVAL,
* otherwise, returns 0
*
* Input: resource
* Output: the correct start and end address are inputted into the resource node,
* 0 or -EINVAL
*****************************************************************************/
int ibmphp_check_resource(struct resource_node *res, u8 bridge)
{
struct bus_node *bus_cur;
struct range_node *range = NULL;
struct resource_node *res_prev;
struct resource_node *res_cur = NULL;
u32 len_cur = 0, start_cur = 0, len_tmp = 0;
int noranges = 0;
u32 tmp_start; /* this is to make sure start address is divisible by the length needed */
u32 tmp_divide;
u8 flag = 0;
if (!res)
return -EINVAL;
if (bridge) {
/* The rules for bridges are different, 4K divisible for IO, 1M for (pf)mem*/
if (res->type == IO)
tmp_divide = IOBRIDGE;
else
tmp_divide = MEMBRIDGE;
} else
tmp_divide = res->len;
bus_cur = find_bus_wprev(res->busno, NULL, 0);
if (!bus_cur) {
/* didn't find a bus, something's wrong!!! */
debug("no bus in the system, either pci_dev's wrong or allocation failed\n");
return -EINVAL;
}
debug("%s - enter\n", __func__);
debug("bus_cur->busno is %d\n", bus_cur->busno);
/* This is a quick fix to not mess up with the code very much. i.e.,
* 2000-2fff, len = 1000, but when we compare, we need it to be fff */
res->len -= 1;
switch (res->type) {
case IO:
res_cur = bus_cur->firstIO;
noranges = bus_cur->noIORanges;
break;
case MEM:
res_cur = bus_cur->firstMem;
noranges = bus_cur->noMemRanges;
break;
case PFMEM:
res_cur = bus_cur->firstPFMem;
noranges = bus_cur->noPFMemRanges;
break;
default:
err("wrong type of resource to check\n");
return -EINVAL;
}
res_prev = NULL;
while (res_cur) {
range = find_range(bus_cur, res_cur);
debug("%s - rangeno = %d\n", __func__, res_cur->rangeno);
if (!range) {
err("no range for the device exists... bailing out...\n");
return -EINVAL;
}
/* found our range */
if (!res_prev) {
/* first time in the loop */
len_tmp = res_cur->start - 1 - range->start;
if ((res_cur->start != range->start) && (len_tmp >= res->len)) {
debug("len_tmp = %x\n", len_tmp);
if ((len_tmp < len_cur) || (len_cur == 0)) {
if ((range->start % tmp_divide) == 0) {
/* just perfect, starting address is divisible by length */
flag = 1;
len_cur = len_tmp;
start_cur = range->start;
} else {
/* Needs adjusting */
tmp_start = range->start;
flag = 0;
while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
if ((tmp_start % tmp_divide) == 0) {
flag = 1;
len_cur = len_tmp;
start_cur = tmp_start;
break;
}
tmp_start += tmp_divide - tmp_start % tmp_divide;
if (tmp_start >= res_cur->start - 1)
break;
}
}
if (flag && len_cur == res->len) {
debug("but we are not here, right?\n");
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
}
}
}
if (!res_cur->next) {
/* last device on the range */
len_tmp = range->end - (res_cur->end + 1);
if ((range->end != res_cur->end) && (len_tmp >= res->len)) {
debug("len_tmp = %x\n", len_tmp);
if ((len_tmp < len_cur) || (len_cur == 0)) {
if (((res_cur->end + 1) % tmp_divide) == 0) {
/* just perfect, starting address is divisible by length */
flag = 1;
len_cur = len_tmp;
start_cur = res_cur->end + 1;
} else {
/* Needs adjusting */
tmp_start = res_cur->end + 1;
flag = 0;
while ((len_tmp = range->end - tmp_start) >= res->len) {
if ((tmp_start % tmp_divide) == 0) {
flag = 1;
len_cur = len_tmp;
start_cur = tmp_start;
break;
}
tmp_start += tmp_divide - tmp_start % tmp_divide;
if (tmp_start >= range->end)
break;
}
}
if (flag && len_cur == res->len) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
}
}
}
if (res_prev) {
if (res_prev->rangeno != res_cur->rangeno) {
/* 1st device on this range */
len_tmp = res_cur->start - 1 - range->start;
if ((res_cur->start != range->start) && (len_tmp >= res->len)) {
if ((len_tmp < len_cur) || (len_cur == 0)) {
if ((range->start % tmp_divide) == 0) {
/* just perfect, starting address is divisible by length */
flag = 1;
len_cur = len_tmp;
start_cur = range->start;
} else {
/* Needs adjusting */
tmp_start = range->start;
flag = 0;
while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
if ((tmp_start % tmp_divide) == 0) {
flag = 1;
len_cur = len_tmp;
start_cur = tmp_start;
break;
}
tmp_start += tmp_divide - tmp_start % tmp_divide;
if (tmp_start >= res_cur->start - 1)
break;
}
}
if (flag && len_cur == res->len) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
}
}
} else {
/* in the same range */
len_tmp = res_cur->start - 1 - res_prev->end - 1;
if (len_tmp >= res->len) {
if ((len_tmp < len_cur) || (len_cur == 0)) {
if (((res_prev->end + 1) % tmp_divide) == 0) {
/* just perfect, starting address's divisible by length */
flag = 1;
len_cur = len_tmp;
start_cur = res_prev->end + 1;
} else {
/* Needs adjusting */
tmp_start = res_prev->end + 1;
flag = 0;
while ((len_tmp = res_cur->start - 1 - tmp_start) >= res->len) {
if ((tmp_start % tmp_divide) == 0) {
flag = 1;
len_cur = len_tmp;
start_cur = tmp_start;
break;
}
tmp_start += tmp_divide - tmp_start % tmp_divide;
if (tmp_start >= res_cur->start - 1)
break;
}
}
if (flag && len_cur == res->len) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
}
}
}
}
/* end if (res_prev) */
res_prev = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
} /* end of while */
if (!res_prev) {
/* 1st device ever */
/* need to find appropriate range */
switch (res->type) {
case IO:
range = bus_cur->rangeIO;
break;
case MEM:
range = bus_cur->rangeMem;
break;
case PFMEM:
range = bus_cur->rangePFMem;
break;
}
while (range) {
len_tmp = range->end - range->start;
if (len_tmp >= res->len) {
if ((len_tmp < len_cur) || (len_cur == 0)) {
if ((range->start % tmp_divide) == 0) {
/* just perfect, starting address's divisible by length */
flag = 1;
len_cur = len_tmp;
start_cur = range->start;
} else {
/* Needs adjusting */
tmp_start = range->start;
flag = 0;
while ((len_tmp = range->end - tmp_start) >= res->len) {
if ((tmp_start % tmp_divide) == 0) {
flag = 1;
len_cur = len_tmp;
start_cur = tmp_start;
break;
}
tmp_start += tmp_divide - tmp_start % tmp_divide;
if (tmp_start >= range->end)
break;
}
}
if (flag && len_cur == res->len) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
}
}
range = range->next;
} /* end of while */
if ((!range) && (len_cur == 0)) {
/* have gone through the list of devices and ranges and haven't found n.e.thing */
err("no appropriate range.. bailing out...\n");
return -EINVAL;
} else if (len_cur) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
}
if (!res_cur) {
debug("prev->rangeno = %d, noranges = %d\n", res_prev->rangeno, noranges);
if (res_prev->rangeno < noranges) {
/* if there're more ranges out there to check */
switch (res->type) {
case IO:
range = bus_cur->rangeIO;
break;
case MEM:
range = bus_cur->rangeMem;
break;
case PFMEM:
range = bus_cur->rangePFMem;
break;
}
while (range) {
len_tmp = range->end - range->start;
if (len_tmp >= res->len) {
if ((len_tmp < len_cur) || (len_cur == 0)) {
if ((range->start % tmp_divide) == 0) {
/* just perfect, starting address's divisible by length */
flag = 1;
len_cur = len_tmp;
start_cur = range->start;
} else {
/* Needs adjusting */
tmp_start = range->start;
flag = 0;
while ((len_tmp = range->end - tmp_start) >= res->len) {
if ((tmp_start % tmp_divide) == 0) {
flag = 1;
len_cur = len_tmp;
start_cur = tmp_start;
break;
}
tmp_start += tmp_divide - tmp_start % tmp_divide;
if (tmp_start >= range->end)
break;
}
}
if (flag && len_cur == res->len) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
}
}
range = range->next;
} /* end of while */
if ((!range) && (len_cur == 0)) {
/* have gone through the list of devices and ranges and haven't found n.e.thing */
err("no appropriate range.. bailing out...\n");
return -EINVAL;
} else if (len_cur) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
}
} else {
/* no more ranges to check on */
if (len_cur) {
res->start = start_cur;
res->len += 1; /* To restore the balance */
res->end = res->start + res->len - 1;
return 0;
} else {
/* have gone through the list of devices and haven't found n.e.thing */
err("no appropriate range.. bailing out...\n");
return -EINVAL;
}
}
} /* end if (!res_cur) */
return -EINVAL;
}
/********************************************************************************
* This routine is called from remove_card if the card contained PPB.
* It will remove all the resources on the bus as well as the bus itself
* Input: Bus
* Output: 0, -ENODEV
********************************************************************************/
int ibmphp_remove_bus(struct bus_node *bus, u8 parent_busno)
{
struct resource_node *res_cur;
struct resource_node *res_tmp;
struct bus_node *prev_bus;
int rc;
prev_bus = find_bus_wprev(parent_busno, NULL, 0);
if (!prev_bus) {
debug("something terribly wrong. Cannot find parent bus to the one to remove\n");
return -ENODEV;
}
debug("In ibmphp_remove_bus... prev_bus->busno is %x\n", prev_bus->busno);
rc = remove_ranges(bus, prev_bus);
if (rc)
return rc;
if (bus->firstIO) {
res_cur = bus->firstIO;
while (res_cur) {
res_tmp = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
kfree(res_tmp);
res_tmp = NULL;
}
bus->firstIO = NULL;
}
if (bus->firstMem) {
res_cur = bus->firstMem;
while (res_cur) {
res_tmp = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
kfree(res_tmp);
res_tmp = NULL;
}
bus->firstMem = NULL;
}
if (bus->firstPFMem) {
res_cur = bus->firstPFMem;
while (res_cur) {
res_tmp = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
kfree(res_tmp);
res_tmp = NULL;
}
bus->firstPFMem = NULL;
}
if (bus->firstPFMemFromMem) {
res_cur = bus->firstPFMemFromMem;
while (res_cur) {
res_tmp = res_cur;
res_cur = res_cur->next;
kfree(res_tmp);
res_tmp = NULL;
}
bus->firstPFMemFromMem = NULL;
}
list_del(&bus->bus_list);
kfree(bus);
return 0;
}
/******************************************************************************
* This routine deletes the ranges from a given bus, and the entries from the
* parent's bus in the resources
* Input: current bus, previous bus
* Output: 0, -EINVAL
******************************************************************************/
static int remove_ranges(struct bus_node *bus_cur, struct bus_node *bus_prev)
{
struct range_node *range_cur;
struct range_node *range_tmp;
int i;
struct resource_node *res = NULL;
if (bus_cur->noIORanges) {
range_cur = bus_cur->rangeIO;
for (i = 0; i < bus_cur->noIORanges; i++) {
if (ibmphp_find_resource(bus_prev, range_cur->start, &res, IO) < 0)
return -EINVAL;
ibmphp_remove_resource(res);
range_tmp = range_cur;
range_cur = range_cur->next;
kfree(range_tmp);
range_tmp = NULL;
}
bus_cur->rangeIO = NULL;
}
if (bus_cur->noMemRanges) {
range_cur = bus_cur->rangeMem;
for (i = 0; i < bus_cur->noMemRanges; i++) {
if (ibmphp_find_resource(bus_prev, range_cur->start, &res, MEM) < 0)
return -EINVAL;
ibmphp_remove_resource(res);
range_tmp = range_cur;
range_cur = range_cur->next;
kfree(range_tmp);
range_tmp = NULL;
}
bus_cur->rangeMem = NULL;
}
if (bus_cur->noPFMemRanges) {
range_cur = bus_cur->rangePFMem;
for (i = 0; i < bus_cur->noPFMemRanges; i++) {
if (ibmphp_find_resource(bus_prev, range_cur->start, &res, PFMEM) < 0)
return -EINVAL;
ibmphp_remove_resource(res);
range_tmp = range_cur;
range_cur = range_cur->next;
kfree(range_tmp);
range_tmp = NULL;
}
bus_cur->rangePFMem = NULL;
}
return 0;
}
/*
* find the resource node in the bus
* Input: Resource needed, start address of the resource, type of resource
*/
int ibmphp_find_resource(struct bus_node *bus, u32 start_address, struct resource_node **res, int flag)
{
struct resource_node *res_cur = NULL;
char *type = "";
if (!bus) {
err("The bus passed in NULL to find resource\n");
return -ENODEV;
}
switch (flag) {
case IO:
res_cur = bus->firstIO;
type = "io";
break;
case MEM:
res_cur = bus->firstMem;
type = "mem";
break;
case PFMEM:
res_cur = bus->firstPFMem;
type = "pfmem";
break;
default:
err("wrong type of flag\n");
return -EINVAL;
}
while (res_cur) {
if (res_cur->start == start_address) {
*res = res_cur;
break;
}
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
}
if (!res_cur) {
if (flag == PFMEM) {
res_cur = bus->firstPFMemFromMem;
while (res_cur) {
if (res_cur->start == start_address) {
*res = res_cur;
break;
}
res_cur = res_cur->next;
}
if (!res_cur) {
debug("SOS...cannot find %s resource in the bus.\n", type);
return -EINVAL;
}
} else {
debug("SOS... cannot find %s resource in the bus.\n", type);
return -EINVAL;
}
}
if (*res)
debug("*res->start = %x\n", (*res)->start);
return 0;
}
/***********************************************************************
* This routine will free the resource structures used by the
* system. It is called from cleanup routine for the module
* Parameters: none
* Returns: none
***********************************************************************/
void ibmphp_free_resources(void)
{
struct bus_node *bus_cur = NULL, *next;
struct bus_node *bus_tmp;
struct range_node *range_cur;
struct range_node *range_tmp;
struct resource_node *res_cur;
struct resource_node *res_tmp;
int i = 0;
flags = 1;
list_for_each_entry_safe(bus_cur, next, &gbuses, bus_list) {
if (bus_cur->noIORanges) {
range_cur = bus_cur->rangeIO;
for (i = 0; i < bus_cur->noIORanges; i++) {
if (!range_cur)
break;
range_tmp = range_cur;
range_cur = range_cur->next;
kfree(range_tmp);
range_tmp = NULL;
}
}
if (bus_cur->noMemRanges) {
range_cur = bus_cur->rangeMem;
for (i = 0; i < bus_cur->noMemRanges; i++) {
if (!range_cur)
break;
range_tmp = range_cur;
range_cur = range_cur->next;
kfree(range_tmp);
range_tmp = NULL;
}
}
if (bus_cur->noPFMemRanges) {
range_cur = bus_cur->rangePFMem;
for (i = 0; i < bus_cur->noPFMemRanges; i++) {
if (!range_cur)
break;
range_tmp = range_cur;
range_cur = range_cur->next;
kfree(range_tmp);
range_tmp = NULL;
}
}
if (bus_cur->firstIO) {
res_cur = bus_cur->firstIO;
while (res_cur) {
res_tmp = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
kfree(res_tmp);
res_tmp = NULL;
}
bus_cur->firstIO = NULL;
}
if (bus_cur->firstMem) {
res_cur = bus_cur->firstMem;
while (res_cur) {
res_tmp = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
kfree(res_tmp);
res_tmp = NULL;
}
bus_cur->firstMem = NULL;
}
if (bus_cur->firstPFMem) {
res_cur = bus_cur->firstPFMem;
while (res_cur) {
res_tmp = res_cur;
if (res_cur->next)
res_cur = res_cur->next;
else
res_cur = res_cur->nextRange;
kfree(res_tmp);
res_tmp = NULL;
}
bus_cur->firstPFMem = NULL;
}
if (bus_cur->firstPFMemFromMem) {
res_cur = bus_cur->firstPFMemFromMem;
while (res_cur) {
res_tmp = res_cur;
res_cur = res_cur->next;
kfree(res_tmp);
res_tmp = NULL;
}
bus_cur->firstPFMemFromMem = NULL;
}
bus_tmp = bus_cur;
list_del(&bus_cur->bus_list);
kfree(bus_tmp);
bus_tmp = NULL;
}
}
/*********************************************************************************
* This function will go over the PFmem resources to check if the EBDA allocated
* pfmem out of memory buckets of the bus. If so, it will change the range numbers
* and a flag to indicate that this resource is out of memory. It will also move the
* Pfmem out of the pfmem resource list to the PFMemFromMem list, and will create
* a new Mem node
* This routine is called right after initialization
*******************************************************************************/
static int __init once_over(void)
{
struct resource_node *pfmem_cur;
struct resource_node *pfmem_prev;
struct resource_node *mem;
struct bus_node *bus_cur;
list_for_each_entry(bus_cur, &gbuses, bus_list) {
if ((!bus_cur->rangePFMem) && (bus_cur->firstPFMem)) {
for (pfmem_cur = bus_cur->firstPFMem, pfmem_prev = NULL; pfmem_cur; pfmem_prev = pfmem_cur, pfmem_cur = pfmem_cur->next) {
pfmem_cur->fromMem = 1;
if (pfmem_prev)
pfmem_prev->next = pfmem_cur->next;
else
bus_cur->firstPFMem = pfmem_cur->next;
if (!bus_cur->firstPFMemFromMem)
pfmem_cur->next = NULL;
else
/* we don't need to sort PFMemFromMem since we're using mem node for
all the real work anyways, so just insert at the beginning of the
list
*/
pfmem_cur->next = bus_cur->firstPFMemFromMem;
bus_cur->firstPFMemFromMem = pfmem_cur;
mem = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!mem)
return -ENOMEM;
mem->type = MEM;
mem->busno = pfmem_cur->busno;
mem->devfunc = pfmem_cur->devfunc;
mem->start = pfmem_cur->start;
mem->end = pfmem_cur->end;
mem->len = pfmem_cur->len;
if (ibmphp_add_resource(mem) < 0)
err("Trouble...trouble... EBDA allocated pfmem from mem, but system doesn't display it has this space... unless not PCI device...\n");
pfmem_cur->rangeno = mem->rangeno;
} /* end for pfmem */
} /* end if */
} /* end list_for_each bus */
return 0;
}
int ibmphp_add_pfmem_from_mem(struct resource_node *pfmem)
{
struct bus_node *bus_cur = find_bus_wprev(pfmem->busno, NULL, 0);
if (!bus_cur) {
err("cannot find bus of pfmem to add...\n");
return -ENODEV;
}
if (bus_cur->firstPFMemFromMem)
pfmem->next = bus_cur->firstPFMemFromMem;
else
pfmem->next = NULL;
bus_cur->firstPFMemFromMem = pfmem;
return 0;
}
/* This routine just goes through the buses to see if the bus already exists.
* It is called from ibmphp_find_sec_number, to find out a secondary bus number for
* bridged cards
* Parameters: bus_number
* Returns: Bus pointer or NULL
*/
struct bus_node *ibmphp_find_res_bus(u8 bus_number)
{
return find_bus_wprev(bus_number, NULL, 0);
}
static struct bus_node *find_bus_wprev(u8 bus_number, struct bus_node **prev, u8 flag)
{
struct bus_node *bus_cur;
list_for_each_entry(bus_cur, &gbuses, bus_list) {
if (flag)
*prev = list_prev_entry(bus_cur, bus_list);
if (bus_cur->busno == bus_number)
return bus_cur;
}
return NULL;
}
void ibmphp_print_test(void)
{
int i = 0;
struct bus_node *bus_cur = NULL;
struct range_node *range;
struct resource_node *res;
debug_pci("*****************START**********************\n");
if ((!list_empty(&gbuses)) && flags) {
err("The GBUSES is not NULL?!?!?!?!?\n");
return;
}
list_for_each_entry(bus_cur, &gbuses, bus_list) {
debug_pci ("This is bus # %d. There are\n", bus_cur->busno);
debug_pci ("IORanges = %d\t", bus_cur->noIORanges);
debug_pci ("MemRanges = %d\t", bus_cur->noMemRanges);
debug_pci ("PFMemRanges = %d\n", bus_cur->noPFMemRanges);
debug_pci ("The IO Ranges are as follows:\n");
if (bus_cur->rangeIO) {
range = bus_cur->rangeIO;
for (i = 0; i < bus_cur->noIORanges; i++) {
debug_pci("rangeno is %d\n", range->rangeno);
debug_pci("[%x - %x]\n", range->start, range->end);
range = range->next;
}
}
debug_pci("The Mem Ranges are as follows:\n");
if (bus_cur->rangeMem) {
range = bus_cur->rangeMem;
for (i = 0; i < bus_cur->noMemRanges; i++) {
debug_pci("rangeno is %d\n", range->rangeno);
debug_pci("[%x - %x]\n", range->start, range->end);
range = range->next;
}
}
debug_pci("The PFMem Ranges are as follows:\n");
if (bus_cur->rangePFMem) {
range = bus_cur->rangePFMem;
for (i = 0; i < bus_cur->noPFMemRanges; i++) {
debug_pci("rangeno is %d\n", range->rangeno);
debug_pci("[%x - %x]\n", range->start, range->end);
range = range->next;
}
}
debug_pci("The resources on this bus are as follows\n");
debug_pci("IO...\n");
if (bus_cur->firstIO) {
res = bus_cur->firstIO;
while (res) {
debug_pci("The range # is %d\n", res->rangeno);
debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
if (res->next)
res = res->next;
else if (res->nextRange)
res = res->nextRange;
else
break;
}
}
debug_pci("Mem...\n");
if (bus_cur->firstMem) {
res = bus_cur->firstMem;
while (res) {
debug_pci("The range # is %d\n", res->rangeno);
debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
if (res->next)
res = res->next;
else if (res->nextRange)
res = res->nextRange;
else
break;
}
}
debug_pci("PFMem...\n");
if (bus_cur->firstPFMem) {
res = bus_cur->firstPFMem;
while (res) {
debug_pci("The range # is %d\n", res->rangeno);
debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
if (res->next)
res = res->next;
else if (res->nextRange)
res = res->nextRange;
else
break;
}
}
debug_pci("PFMemFromMem...\n");
if (bus_cur->firstPFMemFromMem) {
res = bus_cur->firstPFMemFromMem;
while (res) {
debug_pci("The range # is %d\n", res->rangeno);
debug_pci("The bus, devfnc is %d, %x\n", res->busno, res->devfunc);
debug_pci("[%x - %x], len=%x\n", res->start, res->end, res->len);
res = res->next;
}
}
}
debug_pci("***********************END***********************\n");
}
static int range_exists_already(struct range_node *range, struct bus_node *bus_cur, u8 type)
{
struct range_node *range_cur = NULL;
switch (type) {
case IO:
range_cur = bus_cur->rangeIO;
break;
case MEM:
range_cur = bus_cur->rangeMem;
break;
case PFMEM:
range_cur = bus_cur->rangePFMem;
break;
default:
err("wrong type passed to find out if range already exists\n");
return -ENODEV;
}
while (range_cur) {
if ((range_cur->start == range->start) && (range_cur->end == range->end))
return 1;
range_cur = range_cur->next;
}
return 0;
}
/* This routine will read the windows for any PPB we have and update the
* range info for the secondary bus, and will also input this info into
* primary bus, since BIOS doesn't. This is for PPB that are in the system
* on bootup. For bridged cards that were added during previous load of the
* driver, only the ranges and the bus structure are added, the devices are
* added from NVRAM
* Input: primary busno
* Returns: none
* Note: this function doesn't take into account IO restrictions etc,
* so will only work for bridges with no video/ISA devices behind them It
* also will not work for onboard PPBs that can have more than 1 *bus
* behind them All these are TO DO.
* Also need to add more error checkings... (from fnc returns etc)
*/
static int __init update_bridge_ranges(struct bus_node **bus)
{
u8 sec_busno, device, function, hdr_type, start_io_address, end_io_address;
u16 vendor_id, upper_io_start, upper_io_end, start_mem_address, end_mem_address;
u32 start_address, end_address, upper_start, upper_end;
struct bus_node *bus_sec;
struct bus_node *bus_cur;
struct resource_node *io;
struct resource_node *mem;
struct resource_node *pfmem;
struct range_node *range;
unsigned int devfn;
bus_cur = *bus;
if (!bus_cur)
return -ENODEV;
ibmphp_pci_bus->number = bus_cur->busno;
debug("inside %s\n", __func__);
debug("bus_cur->busno = %x\n", bus_cur->busno);
for (device = 0; device < 32; device++) {
for (function = 0x00; function < 0x08; function++) {
devfn = PCI_DEVFN(device, function);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
/* found correct device!!! */
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
switch (hdr_type) {
case PCI_HEADER_TYPE_NORMAL:
function = 0x8;
break;
case PCI_HEADER_TYPE_MULTIDEVICE:
break;
case PCI_HEADER_TYPE_BRIDGE:
function = 0x8;
fallthrough;
case PCI_HEADER_TYPE_MULTIBRIDGE:
/* We assume here that only 1 bus behind the bridge
TO DO: add functionality for several:
temp = secondary;
while (temp < subordinate) {
...
temp++;
}
*/
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_busno);
bus_sec = find_bus_wprev(sec_busno, NULL, 0);
/* this bus structure doesn't exist yet, PPB was configured during previous loading of ibmphp */
if (!bus_sec) {
bus_sec = alloc_error_bus(NULL, sec_busno, 1);
/* the rest will be populated during NVRAM call */
return 0;
}
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &start_io_address);
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &end_io_address);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, &upper_io_start);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, &upper_io_end);
start_address = (start_io_address & PCI_IO_RANGE_MASK) << 8;
start_address |= (upper_io_start << 16);
end_address = (end_io_address & PCI_IO_RANGE_MASK) << 8;
end_address |= (upper_io_end << 16);
if ((start_address) && (start_address <= end_address)) {
range = kzalloc(sizeof(struct range_node), GFP_KERNEL);
if (!range)
return -ENOMEM;
range->start = start_address;
range->end = end_address + 0xfff;
if (bus_sec->noIORanges > 0) {
if (!range_exists_already(range, bus_sec, IO)) {
add_bus_range(IO, range, bus_sec);
++bus_sec->noIORanges;
} else {
kfree(range);
range = NULL;
}
} else {
/* 1st IO Range on the bus */
range->rangeno = 1;
bus_sec->rangeIO = range;
++bus_sec->noIORanges;
}
fix_resources(bus_sec);
if (ibmphp_find_resource(bus_cur, start_address, &io, IO)) {
io = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!io) {
kfree(range);
return -ENOMEM;
}
io->type = IO;
io->busno = bus_cur->busno;
io->devfunc = ((device << 3) | (function & 0x7));
io->start = start_address;
io->end = end_address + 0xfff;
io->len = io->end - io->start + 1;
ibmphp_add_resource(io);
}
}
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &start_mem_address);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &end_mem_address);
start_address = 0x00000000 | (start_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
end_address = 0x00000000 | (end_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
if ((start_address) && (start_address <= end_address)) {
range = kzalloc(sizeof(struct range_node), GFP_KERNEL);
if (!range)
return -ENOMEM;
range->start = start_address;
range->end = end_address + 0xfffff;
if (bus_sec->noMemRanges > 0) {
if (!range_exists_already(range, bus_sec, MEM)) {
add_bus_range(MEM, range, bus_sec);
++bus_sec->noMemRanges;
} else {
kfree(range);
range = NULL;
}
} else {
/* 1st Mem Range on the bus */
range->rangeno = 1;
bus_sec->rangeMem = range;
++bus_sec->noMemRanges;
}
fix_resources(bus_sec);
if (ibmphp_find_resource(bus_cur, start_address, &mem, MEM)) {
mem = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!mem) {
kfree(range);
return -ENOMEM;
}
mem->type = MEM;
mem->busno = bus_cur->busno;
mem->devfunc = ((device << 3) | (function & 0x7));
mem->start = start_address;
mem->end = end_address + 0xfffff;
mem->len = mem->end - mem->start + 1;
ibmphp_add_resource(mem);
}
}
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &start_mem_address);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &end_mem_address);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, &upper_start);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, &upper_end);
start_address = 0x00000000 | (start_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
end_address = 0x00000000 | (end_mem_address & PCI_MEMORY_RANGE_MASK) << 16;
#if BITS_PER_LONG == 64
start_address |= ((long) upper_start) << 32;
end_address |= ((long) upper_end) << 32;
#endif
if ((start_address) && (start_address <= end_address)) {
range = kzalloc(sizeof(struct range_node), GFP_KERNEL);
if (!range)
return -ENOMEM;
range->start = start_address;
range->end = end_address + 0xfffff;
if (bus_sec->noPFMemRanges > 0) {
if (!range_exists_already(range, bus_sec, PFMEM)) {
add_bus_range(PFMEM, range, bus_sec);
++bus_sec->noPFMemRanges;
} else {
kfree(range);
range = NULL;
}
} else {
/* 1st PFMem Range on the bus */
range->rangeno = 1;
bus_sec->rangePFMem = range;
++bus_sec->noPFMemRanges;
}
fix_resources(bus_sec);
if (ibmphp_find_resource(bus_cur, start_address, &pfmem, PFMEM)) {
pfmem = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!pfmem) {
kfree(range);
return -ENOMEM;
}
pfmem->type = PFMEM;
pfmem->busno = bus_cur->busno;
pfmem->devfunc = ((device << 3) | (function & 0x7));
pfmem->start = start_address;
pfmem->end = end_address + 0xfffff;
pfmem->len = pfmem->end - pfmem->start + 1;
pfmem->fromMem = 0;
ibmphp_add_resource(pfmem);
}
}
break;
} /* end of switch */
} /* end if vendor */
} /* end for function */
} /* end for device */
bus = &bus_cur;
return 0;
}
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