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authorMichael Ellerman <michael@ellerman.id.au>2009-03-05 14:44:26 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-03-11 17:11:33 +1100
commit94afa5a5f54235c4612198768b6a2fa2e2366f44 (patch)
tree392eea5363e4655f3cfd0cfc05a611dbd258a278 /arch/powerpc/platforms/pseries/msi.c
parente7943fbbfdb6eef03c003b374de1f802cc14f02a (diff)
downloadvexpress-lsk-94afa5a5f54235c4612198768b6a2fa2e2366f44.tar.gz
powerpc/pseries: Reject discontiguous/non-zero based MSI-X requests
There's no way for us to express to firmware that we want a discontiguous, or non-zero based, range of MSI-X entries. So we must reject such requests. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/msi.c')
-rw-r--r--arch/powerpc/platforms/pseries/msi.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index 3e0d6ef3eca..bf2e1ac4130 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -356,6 +356,27 @@ static int rtas_msi_check_device(struct pci_dev *pdev, int nvec, int type)
return 0;
}
+static int check_msix_entries(struct pci_dev *pdev)
+{
+ struct msi_desc *entry;
+ int expected;
+
+ /* There's no way for us to express to firmware that we want
+ * a discontiguous, or non-zero based, range of MSI-X entries.
+ * So we must reject such requests. */
+
+ expected = 0;
+ list_for_each_entry(entry, &pdev->msi_list, list) {
+ if (entry->msi_attrib.entry_nr != expected) {
+ pr_debug("rtas_msi: bad MSI-X entries.\n");
+ return -EINVAL;
+ }
+ expected++;
+ }
+
+ return 0;
+}
+
static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
struct pci_dn *pdn;
@@ -367,6 +388,9 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
if (!pdn)
return -ENODEV;
+ if (type == PCI_CAP_ID_MSIX && check_msix_entries(pdev))
+ return -EINVAL;
+
/*
* Try the new more explicit firmware interface, if that fails fall
* back to the old interface. The old interface is known to never