Commit-ID: d31eb342409b24e3d2e1989c775f3361e93acc08
Gitweb: http://git.kernel.org/tip/d31eb342409b24e3d2e1989c775f3361e93acc08
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
AuthorDate: Sat, 15 Nov 2014 22:24:03 +0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sun, 23 Nov 2014 13:01:45 +0100
PCI/MSI: Introduce helpers to hide struct msi_desc implementation details
Introduce helpers to hide struct msi_desc implementation details,
so we could easily support non-PCI-compliant MSI devices later by
moving msi_list into struct device.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Yijing Wang <wangyijing@xxxxxxxxxx>
Cc: Yingjoe Chen <yingjoe.chen@xxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1416061447-9472-6-git-send-email-jiang.liu@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/msi.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 1dcad0c..e0d0851 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -43,6 +43,25 @@ struct msi_desc {
struct msi_msg msg;
};
+/* Helpers to hide struct msi_desc implementation details */
+#define msi_desc_to_dev(desc) (&(desc)->dev.dev)
+#define dev_to_msi_list(dev) (&to_pci_dev((dev))->msi_list)
+#define first_msi_entry(dev) \
+ list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
+#define for_each_msi_entry(desc, dev) \
+ list_for_each_entry((desc), dev_to_msi_list((dev)), list)
+
+#ifdef CONFIG_PCI_MSI
+#define first_pci_msi_entry(pdev) first_msi_entry(&(pdev)->dev)
+#define for_each_pci_msi_entry(desc, pdev) \
+ for_each_msi_entry((desc), &(pdev)->dev)
+
+static inline struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
+{
+ return desc->dev;
+}
+#endif /* CONFIG_PCI_MSI */
+
void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
--
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