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Message-ID: <43F901BD926A4E43B106BF17856F07559FB80CFD@orsmsx508.amr.corp.intel.com>
Date: Fri, 12 Feb 2010 17:40:07 -0800
From: "Pan, Jacob jun" <jacob.jun.pan@...el.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
Arjan van de Ven <arjan@...ux.intel.com>,
"Barnes, Jesse" <jesse.barnes@...el.com>,
"Du, Alek" <alek.du@...el.com>, "Tang, Feng" <feng.tang@...el.com>,
"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH 1/9] PCI: add pci_bus_find_ext_capability
>From 84aabace8ffe48c4f01721b9bc56c6ecd8e673a6 Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@...tuousgeek.org>
Date: Wed, 15 Jul 2009 13:13:00 -0700
Subject: [PATCH 1/9] PCI: add pci_bus_find_ext_capability
For use by code that needs to walk extended capability lists before
pci_dev structures are set up.
Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Jacob Pan <jacob.jun.pan@...el.com>
---
drivers/pci/pci.c | 43 +++++++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 2 ++
2 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 315fea4..aad62af 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -297,6 +297,49 @@ int pci_find_ext_capability(struct pci_dev *dev, int cap)
}
EXPORT_SYMBOL_GPL(pci_find_ext_capability);
+/**
+ * pci_bus_find_ext_capability - find an extended capability
+ * @bus: the PCI bus to query
+ * @devfn: PCI device to query
+ * @cap: capability code
+ *
+ * Like pci_find_ext_capability() but works for pci devices that do not have a
+ * pci_dev structure set up yet.
+ *
+ * Returns the address of the requested capability structure within the
+ * device's PCI configuration space or 0 in case the device does not
+ * support it.
+ */
+int pci_bus_find_ext_capability(struct pci_bus *bus, unsigned int devfn,
+ int cap)
+{
+ u32 header;
+ int ttl;
+ int pos = PCI_CFG_SPACE_SIZE;
+
+ /* minimum 8 bytes per capability */
+ ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
+
+ if (!pci_bus_read_config_dword(bus, devfn, pos, &header))
+ return 0;
+ if (header == 0xffffffff || header == 0)
+ return 0;
+
+ while (ttl-- > 0) {
+ if (PCI_EXT_CAP_ID(header) == cap)
+ return pos;
+
+ pos = PCI_EXT_CAP_NEXT(header);
+ if (pos < PCI_CFG_SPACE_SIZE)
+ break;
+
+ if (!pci_bus_read_config_dword(bus, devfn, pos, &header))
+ break;
+ }
+
+ return 0;
+}
+
static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap)
{
int rc, ttl = PCI_FIND_CAP_TTL;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c1968f4..65f8a8f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -631,6 +631,8 @@ enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *dev);
int pci_find_capability(struct pci_dev *dev, int cap);
int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap);
int pci_find_ext_capability(struct pci_dev *dev, int cap);
+int pci_bus_find_ext_capability(struct pci_bus *bus, unsigned int devfn,
+ int cap);
int pci_find_ht_capability(struct pci_dev *dev, int ht_cap);
int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap);
struct pci_bus *pci_find_next_bus(const struct pci_bus *from);
--
1.6.5.3
--
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