[PATCH 1/1] powerpc: Force 32 bit MSIs for devices that require it

[Brian King]

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 at linux.vnet.ibm.com>
---

 arch/powerpc/include/asm/pci-bridge.h |    2 ++
 arch/powerpc/platforms/pseries/msi.c  |   21 ++++++++++++++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)

diff -puN arch/powerpc/platforms/pseries/msi.c~powerpc_32_bit_msi_papr arch/powerpc/platforms/pseries/msi.c
--- linux/arch/powerpc/platforms/pseries/msi.c~powerpc_32_bit_msi_papr	2013-05-03 11:15:09.000000000 -0500
+++ linux-bjking1/arch/powerpc/platforms/pseries/msi.c	2013-05-03 12:33:11.000000000 -0500
@@ -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
 
 	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 pc
 	 */
 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);
diff -puN arch/powerpc/include/asm/pci-bridge.h~powerpc_32_bit_msi_papr arch/powerpc/include/asm/pci-bridge.h
--- linux/arch/powerpc/include/asm/pci-bridge.h~powerpc_32_bit_msi_papr	2013-05-03 11:15:09.000000000 -0500
+++ linux-bjking1/arch/powerpc/include/asm/pci-bridge.h	2013-05-03 11:15:09.000000000 -0500
@@ -163,6 +163,8 @@ struct pci_dn {
 
 	int	pci_ext_config_space;	/* for pci devices */
 
+	int	force_32bit_msi:1;
+
 	struct	pci_dev *pcidev;	/* back-pointer to the pci device */
 #ifdef CONFIG_EEH
 	struct eeh_dev *edev;		/* eeh device */
_