aboutsummaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
authorRam Pai <linuxram@us.ibm.com>2011-07-07 14:19:10 -0400
committerJesse Barnes <jbarnes@virtuousgeek.org>2011-07-08 18:49:20 -0400
commitf483d3923dc3a6394c483e28ccb3fe700bdf399e (patch)
treeef487babd0ef104e1fa8323c23050d66096c0f3a /drivers
parenta2fa83faf47b514ab947cea916d3691b66525073 (diff)
PCI: conditional resource-reallocation through kernel parameter pci=realloc
Multiple attempts to dynamically reallocate pci resources have unfortunately lead to regressions. Though we continue to fix the regressions and fine tune the dynamic-reallocation behavior, we have not reached a acceptable state yet. This patch provides a interim solution. It disables dynamic reallocation by default, but adds the ability to enable it through pci=realloc kernel command line parameter. Tested-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/pci.c2
-rw-r--r--drivers/pci/pci.h2
-rw-r--r--drivers/pci/setup-bus.c15
3 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 2c5b9b991279..692671b11667 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3483,6 +3483,8 @@ static int __init pci_setup(char *str)
3483 pci_no_msi(); 3483 pci_no_msi();
3484 } else if (!strcmp(str, "noaer")) { 3484 } else if (!strcmp(str, "noaer")) {
3485 pci_no_aer(); 3485 pci_no_aer();
3486 } else if (!strncmp(str, "realloc", 7)) {
3487 pci_realloc();
3486 } else if (!strcmp(str, "nodomains")) { 3488 } else if (!strcmp(str, "nodomains")) {
3487 pci_no_domains(); 3489 pci_no_domains();
3488 } else if (!strncmp(str, "cbiosize=", 9)) { 3490 } else if (!strncmp(str, "cbiosize=", 9)) {
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 731e20265ace..3a39bf1f1e2c 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -146,6 +146,8 @@ static inline void pci_no_msi(void) { }
146static inline void pci_msi_init_pci_dev(struct pci_dev *dev) { } 146static inline void pci_msi_init_pci_dev(struct pci_dev *dev) { }
147#endif 147#endif
148 148
149extern void pci_realloc(void);
150
149static inline int pci_no_d1d2(struct pci_dev *dev) 151static inline int pci_no_d1d2(struct pci_dev *dev)
150{ 152{
151 unsigned int parent_dstates = 0; 153 unsigned int parent_dstates = 0;
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 1e9e5a5b8c81..9995842e45b5 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -47,6 +47,13 @@ struct resource_list_x {
47 (head)->next = NULL; \ 47 (head)->next = NULL; \
48} while (0) 48} while (0)
49 49
50int pci_realloc_enable = 0;
51#define pci_realloc_enabled() pci_realloc_enable
52void pci_realloc(void)
53{
54 pci_realloc_enable = 1;
55}
56
50/** 57/**
51 * add_to_list() - add a new resource tracker to the list 58 * add_to_list() - add a new resource tracker to the list
52 * @head: Head of the list 59 * @head: Head of the list
@@ -1025,6 +1032,7 @@ static int __init pci_get_max_depth(void)
1025 return depth; 1032 return depth;
1026} 1033}
1027 1034
1035
1028/* 1036/*
1029 * first try will not touch pci bridge res 1037 * first try will not touch pci bridge res
1030 * second and later try will clear small leaf bridge res 1038 * second and later try will clear small leaf bridge res
@@ -1068,6 +1076,13 @@ again:
1068 /* any device complain? */ 1076 /* any device complain? */
1069 if (!head.next) 1077 if (!head.next)
1070 goto enable_and_dump; 1078 goto enable_and_dump;
1079
1080 /* don't realloc if asked to do so */
1081 if (!pci_realloc_enabled()) {
1082 free_list(resource_list_x, &head);
1083 goto enable_and_dump;
1084 }
1085
1071 failed_type = 0; 1086 failed_type = 0;
1072 for (list = head.next; list;) { 1087 for (list = head.next; list;) {
1073 failed_type |= list->flags; 1088 failed_type |= list->flags;