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-rw-r--r--arch/powerpc/platforms/pseries/msi.c40
1 files changed, 37 insertions, 3 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
index d34f4ffdb79..6d2f0abce6f 100644
--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -374,6 +374,23 @@ static int check_msix_entries(struct pci_dev *pdev)
return 0;
}
+static void rtas_hack_32bit_msi_gen2(struct pci_dev *pdev)
+{
+ u32 addr_hi, addr_lo;
+
+ /*
+ * We should only get in here for IODA1 configs. This is based on the
+ * fact that we using RTAS for MSIs, we don't have the 32 bit MSI RTAS
+ * support, and we are in a PCIe Gen2 slot.
+ */
+ dev_info(&pdev->dev,
+ "rtas_msi: No 32 bit MSI firmware support, forcing 32 bit MSI\n");
+ pci_read_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI, &addr_hi);
+ addr_lo = 0xffff0000 | ((addr_hi >> (48 - 32)) << 4);
+ pci_write_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_LO, addr_lo);
+ pci_write_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI, 0);
+}
+
static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
{
struct pci_dn *pdn;
@@ -381,6 +398,7 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
struct msi_desc *entry;
struct msi_msg msg;
int nvec = nvec_in;
+ int use_32bit_msi_hack = 0;
pdn = pci_get_pdn(pdev);
if (!pdn)
@@ -408,15 +426,31 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
*/
again:
if (type == PCI_CAP_ID_MSI) {
- if (pdn->force_32bit_msi)
+ if (pdn->force_32bit_msi) {
rc = rtas_change_msi(pdn, RTAS_CHANGE_32MSI_FN, nvec);
- else
+ if (rc < 0) {
+ /*
+ * We only want to run the 32 bit MSI hack below if
+ * the max bus speed is Gen2 speed
+ */
+ if (pdev->bus->max_bus_speed != PCIE_SPEED_5_0GT)
+ return rc;
+
+ use_32bit_msi_hack = 1;
+ }
+ } else
+ rc = -1;
+
+ if (rc < 0)
rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec);
- if (rc < 0 && !pdn->force_32bit_msi) {
+ if (rc < 0) {
pr_debug("rtas_msi: trying the old firmware call.\n");
rc = rtas_change_msi(pdn, RTAS_CHANGE_FN, nvec);
}
+
+ if (use_32bit_msi_hack && rc > 0)
+ rtas_hack_32bit_msi_gen2(pdev);
} else
rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec);