powerpc/pseries: Force 32 bit MSIs for devices that require it

The following patch implements a new PAPR change which allows
the OS to force the use of 32 bit MSIs, regardless of what
the PCI capabilities indicate. This is required for some
devices that advertise support for 64 bit MSIs but don't
actually support them.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 18 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index e5b084723131..420524e6f8c9 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -24,6 +24,7 @@ static int query_token, change_token;
 #define RTAS_RESET_FN           2
 #define RTAS_CHANGE_MSI_FN      3
 #define RTAS_CHANGE_MSIX_FN     4
+#define RTAS_CHANGE_32MSI_FN    5
 
 static struct pci_dn *get_pdn(struct pci_dev *pdev)
 {
@@ -58,7 +59,8 @@ static int rtas_change_msi(struct pci_dn *pdn, u32 func, u32 num_irqs)
 
         seq_num = 1;
         do {
-                if (func == RTAS_CHANGE_MSI_FN || func == RTAS_CHANGE_MSIX_FN)
+                if (func == RTAS_CHANGE_MSI_FN || func == RTAS_CHANGE_MSIX_FN ||
+                    func == RTAS_CHANGE_32MSI_FN)
                         rc = rtas_call(change_token, 6, 4, rtas_ret, addr,
                                         BUID_HI(buid), BUID_LO(buid),
                                         func, num_irqs, seq_num);
@@ -426,9 +428,12 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
          */
 again:
         if (type == PCI_CAP_ID_MSI) {
-                rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec);
+                if (pdn->force_32bit_msi)
+                        rc = rtas_change_msi(pdn, RTAS_CHANGE_32MSI_FN, nvec);
+                else
+                        rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec);
 
-                if (rc < 0) {
+                if (rc < 0 && !pdn->force_32bit_msi) {
                         pr_debug("rtas_msi: trying the old firmware call.\n");
                         rc = rtas_change_msi(pdn, RTAS_CHANGE_FN, nvec);
                 }
@@ -512,3 +517,13 @@ static int rtas_msi_init(void)
         return 0;
 }
 arch_initcall(rtas_msi_init);
+
+static void quirk_radeon(struct pci_dev *dev)
+{
+        struct pci_dn *pdn = get_pdn(dev);
+
+        if (pdn)
+                pdn->force_32bit_msi = 1;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x68f2, quirk_radeon);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0xaa68, quirk_radeon);