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authorSebastian Ott <sebott@linux.vnet.ibm.com>2016-01-27 13:33:30 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-11-23 16:02:26 +0100
commit5c5afd0201221be578ec200dfedfa04acda529c1 (patch)
tree0a3ef4f5f8320375f48567b453afd4dbf71c246f /arch/s390/pci
parent80abb39b504e08613549684fa236c1a7ee22a7cd (diff)
downloadlinux-5c5afd0201221be578ec200dfedfa04acda529c1.tar.bz2
s390/pci: use unique UIDs for domain enumeration
Use UIDs as domain numbers if the UID checking rules apply (in this case the FW guarantees uniqueness of these values). Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci')
-rw-r--r--arch/s390/pci/pci.c8
-rw-r--r--arch/s390/pci/pci_clp.c3
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 15ffc19c8c0c..64e1734bebb7 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -722,6 +722,11 @@ struct dev_pm_ops pcibios_pm_ops = {
static int zpci_alloc_domain(struct zpci_dev *zdev)
{
+ if (zpci_unique_uid) {
+ zdev->domain = (u16) zdev->uid;
+ return 0;
+ }
+
spin_lock(&zpci_domain_lock);
zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
if (zdev->domain == ZPCI_NR_DEVICES) {
@@ -735,6 +740,9 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
static void zpci_free_domain(struct zpci_dev *zdev)
{
+ if (zpci_unique_uid)
+ return;
+
spin_lock(&zpci_domain_lock);
clear_bit(zdev->domain, zpci_domain);
spin_unlock(&zpci_domain_lock);
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 1a4512c8544a..e3ef63b36b5a 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -22,6 +22,8 @@
#include <asm/clp.h>
#include <uapi/asm/clp.h>
+bool zpci_unique_uid;
+
static inline void zpci_err_clp(unsigned int rsp, int rc)
{
struct {
@@ -315,6 +317,7 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
goto out;
}
+ zpci_unique_uid = rrb->response.uid_checking;
WARN_ON_ONCE(rrb->response.entry_size !=
sizeof(struct clp_fh_list_entry));