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authorNiklas Schnelle <schnelle@linux.ibm.com>2020-03-18 13:53:16 +0100
committerVasily Gorbik <gor@linux.ibm.com>2020-03-23 13:41:55 +0100
commit7a11c67a1ff9b0231eaaaa6a28294776d55b569a (patch)
treefc3c9e0e3410a978059aacef3dfb6642dcb561c2 /arch/s390
parent969ae01bab2fe938b4c8324836038b5ac1c78fac (diff)
downloadlinux-7a11c67a1ff9b0231eaaaa6a28294776d55b569a.tar.bz2
s390/pci: Improve handling of unset UID
When UID checking is enabled a UID value of 0 is invalid and can not be set by the user. On z/VM it is however used to indicate an unset UID. Until now, this lead to the behavior that one PCI function could be attached with UID 0 after which z/VM would prohibit further attachment. Now if the user then turns off UID checking in z/VM the user could seemingly attach additional PCI functions that would however not show up in Linux as that would not be informed of the change in UID checking mode. This is unexpected and confusing and lead to bug reports against Linux. Instead now, if we encounter an unset UID value of 0 treat it as indicating that UID checking was turned off, switch to automatic domain allocation, and warn the user of the possible misconfiguration. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/pci.h3
-rw-r--r--arch/s390/pci/pci.c8
-rw-r--r--arch/s390/pci/pci_clp.c2
3 files changed, 12 insertions, 1 deletions
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 93527655e752..7485ee561fec 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -189,6 +189,9 @@ int clp_enable_fh(struct zpci_dev *, u8);
int clp_disable_fh(struct zpci_dev *);
int clp_get_state(u32 fid, enum zpci_state *state);
+/* UID */
+void update_uid_checking(bool new);
+
/* IOMMU Interface */
int zpci_init_iommu(struct zpci_dev *zdev);
void zpci_destroy_iommu(struct zpci_dev *zdev);
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 2b90a90aa81d..cf7485bdd7cf 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -620,6 +620,13 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
if (zpci_unique_uid) {
zdev->domain = (u16) zdev->uid;
+ if (zdev->domain == 0) {
+ pr_warn("UID checking is active but no UID is set for PCI function %08x, so automatic domain allocation is used instead\n",
+ zdev->fid);
+ update_uid_checking(false);
+ goto auto_allocate;
+ }
+
if (test_bit(zdev->domain, zpci_domain)) {
spin_unlock(&zpci_domain_lock);
pr_err("Adding PCI function %08x failed because domain %04x is already assigned\n",
@@ -631,6 +638,7 @@ static int zpci_alloc_domain(struct zpci_dev *zdev)
spin_unlock(&zpci_domain_lock);
return 0;
}
+auto_allocate:
/*
* We can always auto allocate domains below ZPCI_NR_DEVICES.
* There is either a free domain or we have reached the maximum in
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 0d3d8f170ea4..ea794ae755ae 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -24,7 +24,7 @@
bool zpci_unique_uid;
-static void update_uid_checking(bool new)
+void update_uid_checking(bool new)
{
if (zpci_unique_uid != new)
zpci_dbg(1, "uid checking:%d\n", new);