device core: Introduce per-device MSI domain pointer

As MSI-type features are creeping into non-PCI devices, it is
starting to make sense to give our struct device some form of
support for this, by allowing a pointer to an MSI irq domain to
be set/retrieved.

Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Ma Jun <majun258@huawei.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Duc Dang <dhdang@apm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438091186-10244-4-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/include/linux/device.h b/include/linux/device.h
index 3d3139ad5705e6c2420193f6a4019ae242740942..50e000576d3cb0c3a19d28adb1a70191170856ee 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -715,6 +715,7 @@ struct device_dma_parameters {
  * @pins:      For device pin management.
  *             See Documentation/pinctrl.txt for details.
  * @msi_list:  Hosts MSI descriptors
+ * @msi_domain: The generic MSI domain this device is using.
  * @numa_node: NUMA node this device is close to.
  * @dma_mask:  Dma mask (if dma'ble device).
  * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
@@ -775,6 +776,9 @@ struct device {
        struct dev_pm_info      power;
        struct dev_pm_domain    *pm_domain;
 
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+       struct irq_domain       *msi_domain;
+#endif
 #ifdef CONFIG_PINCTRL
        struct dev_pin_info     *pins;
 #endif
@@ -865,6 +869,22 @@ static inline void set_dev_node(struct device *dev, int node)
 }
 #endif
 
+static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
+{
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+       return dev->msi_domain;
+#else
+       return NULL;
+#endif
+}
+
+static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
+{
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+       dev->msi_domain = d;
+#endif
+}
+
 static inline void *dev_get_drvdata(const struct device *dev)
 {
        return dev->driver_data;