Commit 6397c75c authored by Brice Goglin's avatar Brice Goglin Committed by Greg Kroah-Hartman
Browse files

MSI: Blacklist PCI-E chipsets depending on Hypertransport MSI capability 



Introduce msi_ht_cap_enabled() to check the MSI capability in the
Hypertransport configuration space.
It is used in a generic quirk quirk_msi_ht_cap() to check whether
MSI is enabled on hypertransport chipset, and a nVidia specific quirk
quirk_nvidia_ck804_msi_ht_cap() where two 2 HT MSI mappings have to
be checked.
Both quirks set the PCI_BUS_FLAGS_NO_MSI bus flag when MSI is disabled.

Signed-off-by: default avatarBrice Goglin <brice@myri.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 46ff3463

drivers/pci/quirks.c

+59 −0
Original line number Diff line number Diff line
@@ -1703,6 +1703,65 @@ static void __devinit quirk_disable_msi(struct pci_dev *dev) 
	}

}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_disable_msi);



/* Go through the list of Hypertransport capabilities and

 * return 1 if a HT MSI capability is found and enabled */

static int __devinit msi_ht_cap_enabled(struct pci_dev *dev)

{

	u8 pos;

	int ttl;

	for (pos = pci_find_capability(dev, PCI_CAP_ID_HT), ttl = 48;

	     pos && ttl;

	     pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_HT), ttl--) {

		u32 cap_hdr;

		/* MSI mapping section according to Hypertransport spec */

		if (pci_read_config_dword(dev, pos, &cap_hdr) == 0

		    && (cap_hdr & 0xf8000000) == 0xa8000000 /* MSI mapping */) {

			printk(KERN_INFO "PCI: Found HT MSI mapping on %s with capability %s\n",

			       pci_name(dev), cap_hdr & 0x10000 ? "enabled" : "disabled");

			return (cap_hdr & 0x10000) != 0; /* MSI mapping cap enabled */

		}

	}

	return 0;

}



/* Check the hypertransport MSI mapping to know whether MSI is enabled or not */

static void __devinit quirk_msi_ht_cap(struct pci_dev *dev)

{

	if (dev->subordinate && !msi_ht_cap_enabled(dev)) {

		printk(KERN_WARNING "PCI: MSI quirk detected. "

		       "MSI disabled on chipset %s.\n",

		       pci_name(dev));

		dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;

	}

}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE,

			quirk_msi_ht_cap);



/* The nVidia CK804 chipset may have 2 HT MSI mappings.

 * MSI are supported if the MSI capability set in any of these mappings.

 */

static void __devinit quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev)

{

	struct pci_dev *pdev;



	if (!dev->subordinate)

		return;



	/* check HT MSI cap on this chipset and the root one.

	 * a single one having MSI is enough to be sure that MSI are supported.

	 */

	pdev = pci_find_slot(dev->bus->number, 0);

	if (dev->subordinate && !msi_ht_cap_enabled(dev)

	    && !msi_ht_cap_enabled(pdev)) {

		printk(KERN_WARNING "PCI: MSI quirk detected. "

		       "MSI disabled on chipset %s.\n",

		       pci_name(dev));

		dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;

	}

}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE,

			quirk_nvidia_ck804_msi_ht_cap);

#endif /* CONFIG_PCI_MSI */



EXPORT_SYMBOL(pcie_mch_quirk);

include/linux/pci_ids.h

+1 −0
Original line number Diff line number Diff line
@@ -1411,6 +1411,7 @@ 
#define PCI_DEVICE_ID_SERVERWORKS_LE	  0x0009

#define PCI_DEVICE_ID_SERVERWORKS_GCNB_LE 0x0017

#define PCI_DEVICE_ID_SERVERWORKS_EPB	  0x0103

#define PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE	0x0132

#define PCI_DEVICE_ID_SERVERWORKS_OSB4	  0x0200

#define PCI_DEVICE_ID_SERVERWORKS_CSB5	  0x0201

#define PCI_DEVICE_ID_SERVERWORKS_CSB6    0x0203

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