This is a note to let you know that I've just added the patch titled
powerpc/pseries: Force 32 bit MSIs for devices that require it
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-pseries-force-32-bit-msis-for-devices-that-require-it.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e61133dda480062d221f09e4fc18f66763f8ecd0 Mon Sep 17 00:00:00 2001
From: Brian King <brking@xxxxxxxxxxxxxxxxxx>
Date: Fri, 3 May 2013 11:30:59 +0000
Subject: powerpc/pseries: Force 32 bit MSIs for devices that require it
From: Brian King <brking@xxxxxxxxxxxxxxxxxx>
commit e61133dda480062d221f09e4fc18f66763f8ecd0 upstream.
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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Kleber Sacilotto de Souza <klebers@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/pci-bridge.h | 2 ++
arch/powerpc/platforms/pseries/msi.c | 21 ++++++++++++++++++---
2 files changed, 20 insertions(+), 3 deletions(-)
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -154,6 +154,8 @@ 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 */
--- 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
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);
Patches currently in stable-queue which might be from brking@xxxxxxxxxxxxxxxxxx are
queue-3.9/pci-set-dev-dev.type-in-alloc_pci_dev.patch
queue-3.9/powerpc-pseries-make-32-bit-msi-quirk-work-on-systems-lacking-firmware-support.patch
queue-3.9/powerpc-set-default-vga-device.patch
queue-3.9/powerpc-pseries-force-32-bit-msis-for-devices-that-require-it.patch
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