[tip:irq/irqdomain] PCI/MSI: Introduce helpers to hide struct msi_desc implementation details

tip-bot for Jiang Liu
2014-11-24T20:26:35Z

Commit-ID: d31eb342409b24e3d2e1989c775f3361e93acc08
Gitweb: http://git.kernel.org/tip/d31eb342409b24e3d2e1989c775f3361e93acc08
Author: Jiang Liu <jiang.liu@linux.intel.com>
AuthorDate: Sat, 15 Nov 2014 22:24:03 +0800
Committer: Thomas Gleixner <tglx@linutronix.de>
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@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Alexander Gordeev <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/1416061447-9472-6-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
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);