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ibmphp_res.c
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/*
* IBM Hot Plug Controller Driver
*
* Written By: Irene Zubarev, IBM Corporation
*
* Copyright (C) 2001 Greg Kroah-Hartman ([email protected])
* Copyright (C) 2001,2002 IBM Corp.
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <[email protected]>
*
*/
#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) {
err("out of system memory\n");
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) {
err("out of system memory\n");
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) {
err("out of system memory.\n");
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);
err("out of system memory\n");
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;