genirq/MSI: Store 'struct device' instead of 'struct pci_dev' in struct msi_desc

Store 'struct device *' instead of 'struct pci_dev *' in struct msi_desc,
so struct msi_desc can be reused by non PCI based MSI drivers.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Reviewed-by: Yijing Wang <wangyijing@huawei.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.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: Stuart Yoder <stuart.yoder@freescale.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Alexander Gordeev <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/1436428847-8886-11-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/pci/msi.c

@@ -413,7 +413,7 @@ static struct msi_desc *alloc_msi_entry(struct pci_dev *dev)
 		return NULL;
 
 	INIT_LIST_HEAD(&desc->list);
-	desc->dev = dev;
+	desc->dev = &dev->dev;
 
 	return desc;
 }
@@ -1140,6 +1140,11 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
 }
 EXPORT_SYMBOL(pci_enable_msix_range);
 
+struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
+{
+	return to_pci_dev(desc->dev);
+}
+
 void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
 {
 	struct pci_dev *dev = msi_desc_to_pci_dev(desc);

include/linux/msi.h

@@ -14,6 +14,7 @@ extern int pci_msi_ignore_mask;
 /* Helper functions */
 struct irq_data;
 struct msi_desc;
+struct pci_dev;
 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
 
@@ -37,14 +38,14 @@ struct msi_desc {
 		void __iomem *mask_base;
 		u8 mask_pos;
 	};
-	struct pci_dev *dev;
+	struct device *dev;
 
 	/* Last set MSI message */
 	struct msi_msg msg;
 };
 
 /* Helpers to hide struct msi_desc implementation details */
-#define msi_desc_to_dev(desc)		(&(desc)->dev.dev)
+#define msi_desc_to_dev(desc)		((desc)->dev)
 #define dev_to_msi_list(dev)		(&(dev)->msi_list)
 #define first_msi_entry(dev)		\
 	list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
@@ -56,11 +57,7 @@ struct msi_desc {
 #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;
-}
-
+struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
 void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
 #else /* CONFIG_PCI_MSI */
 static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)