PCI: Add quirk for devices which disable MSI when INTX_DISABLE is set.

A reasonably common problem with some devices is that they will
disable MSI generation when the INTX_DISABLE bit is set in the
PCI_COMMAND register.

Quirk this explicitly, guarding the pci_intx() calls in msi.c with
this quirk indication.

The first entries for this quirk are for 5714 and 5780 Tigon3 chips,
and thus we can remove the workaround code from the tg3.c driver.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michael Chan <mchan@broadcom.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/tg3.c

@@ -7365,10 +7365,6 @@ static int tg3_open(struct net_device *dev)
 		} else if (pci_enable_msi(tp->pdev) == 0) {
 			u32 msi_mode;
 
-			/* Hardware bug - MSI won't work if INTX disabled. */
-			if (tp->tg3_flags2 & TG3_FLG2_5780_CLASS)
-				pci_intx(tp->pdev, 1);
-
 			msi_mode = tr32(MSGINT_MODE);
 			tw32(MSGINT_MODE, msi_mode | MSGINT_MODE_ENABLE);
 			tp->tg3_flags2 |= TG3_FLG2_USING_MSI;
@@ -12681,11 +12677,6 @@ static int tg3_resume(struct pci_dev *pdev)
 	if (err)
 		return err;
 
-	/* Hardware bug - MSI won't work if INTX disabled. */
-	if ((tp->tg3_flags2 & TG3_FLG2_5780_CLASS) &&
-	    (tp->tg3_flags2 & TG3_FLG2_USING_MSI))
-		pci_intx(tp->pdev, 1);
-
 	netif_device_attach(dev);
 
 	tg3_full_lock(tp, 0);

drivers/pci/msi.c

@@ -224,6 +224,12 @@ static struct msi_desc* alloc_msi_entry(void)
 	return entry;
 }
 
+static void pci_intx_for_msi(struct pci_dev *dev, int enable)
+{
+	if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
+		pci_intx(dev, enable);
+}
+
 #ifdef CONFIG_PM
 static void __pci_restore_msi_state(struct pci_dev *dev)
 {
@@ -237,7 +243,7 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
 	entry = get_irq_msi(dev->irq);
 	pos = entry->msi_attrib.pos;
 
-	pci_intx(dev, 0);		/* disable intx */
+	pci_intx_for_msi(dev, 0);
 	msi_set_enable(dev, 0);
 	write_msi_msg(dev->irq, &entry->msg);
 	if (entry->msi_attrib.maskbit)
@@ -260,7 +266,7 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
 		return;
 
 	/* route the table */
-	pci_intx(dev, 0);		/* disable intx */
+	pci_intx_for_msi(dev, 0);
 	msix_set_enable(dev, 0);
 
 	list_for_each_entry(entry, &dev->msi_list, list) {
@@ -343,7 +349,7 @@ static int msi_capability_init(struct pci_dev *dev)
 	}
 
 	/* Set MSI enabled bits	 */
-	pci_intx(dev, 0);		/* disable intx */
+	pci_intx_for_msi(dev, 0);
 	msi_set_enable(dev, 1);
 	dev->msi_enabled = 1;
 
@@ -433,7 +439,7 @@ static int msix_capability_init(struct pci_dev *dev,
 		i++;
 	}
 	/* Set MSI-X enabled bits */
-	pci_intx(dev, 0);		/* disable intx */
+	pci_intx_for_msi(dev, 0);
 	msix_set_enable(dev, 1);
 	dev->msix_enabled = 1;
 
@@ -528,7 +534,7 @@ void pci_disable_msi(struct pci_dev* dev)
 		return;
 
 	msi_set_enable(dev, 0);
-	pci_intx(dev, 1);		/* enable intx */
+	pci_intx_for_msi(dev, 1);
 	dev->msi_enabled = 0;
 
 	BUG_ON(list_empty(&dev->msi_list));
@@ -640,7 +646,7 @@ void pci_disable_msix(struct pci_dev* dev)
 		return;
 
 	msix_set_enable(dev, 0);
-	pci_intx(dev, 1);		/* enable intx */
+	pci_intx_for_msi(dev, 1);
 	dev->msix_enabled = 0;
 
 	msix_free_all_irqs(dev);

drivers/pci/quirks.c

@@ -1707,4 +1707,28 @@ static void __devinit quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE,
 			quirk_nvidia_ck804_msi_ht_cap);
+
+static void __devinit quirk_msi_intx_disable_bug(struct pci_dev *dev)
+{
+	dev->dev_flags |= PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+			PCI_DEVICE_ID_TIGON3_5780,
+			quirk_msi_intx_disable_bug);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+			PCI_DEVICE_ID_TIGON3_5780S,
+			quirk_msi_intx_disable_bug);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+			PCI_DEVICE_ID_TIGON3_5714,
+			quirk_msi_intx_disable_bug);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+			PCI_DEVICE_ID_TIGON3_5714S,
+			quirk_msi_intx_disable_bug);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+			PCI_DEVICE_ID_TIGON3_5715,
+			quirk_msi_intx_disable_bug);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+			PCI_DEVICE_ID_TIGON3_5715S,
+			quirk_msi_intx_disable_bug);
+
 #endif /* CONFIG_PCI_MSI */

include/linux/pci.h

@@ -109,6 +109,14 @@ enum pcie_reset_state {
 	pcie_hot_reset = (__force pcie_reset_state_t) 3
 };
 
+typedef unsigned short __bitwise pci_dev_flags_t;
+enum pci_dev_flags {
+	/* INTX_DISABLE in PCI_COMMAND register disables MSI
+	 * generation too.
+	 */
+	PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG = (__force pci_dev_flags_t) 1,
+};
+
 typedef unsigned short __bitwise pci_bus_flags_t;
 enum pci_bus_flags {
 	PCI_BUS_FLAGS_NO_MSI   = (__force pci_bus_flags_t) 1,
@@ -185,6 +193,7 @@ struct pci_dev {
 	unsigned int	msix_enabled:1;
 	unsigned int	is_managed:1;
 	unsigned int	is_pcie:1;
+	pci_dev_flags_t dev_flags;
 	atomic_t	enable_cnt;	/* pci_enable_device has been called */
 
 	u32		saved_config_space[16]; /* config space saved at suspend time */