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* [PATCH 1/5 RFC] pci:msi: add weak function for returning msi region info
@ 2013-10-29 11:27 Bharat Bhushan
  2013-10-29 11:27 ` [PATCH 4/5 RFC] pci: msi: expose msi region information functions Bharat Bhushan
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: Bharat Bhushan @ 2013-10-29 11:27 UTC (permalink / raw)
  To: alex.williamson, joro, galak, scottwood, linux-kernel,
	linuxppc-dev, linux-pci, agraf, stuart.yoder
  Cc: Bharat Bhushan

In Aperture type of IOMMU (like FSL PAMU), VFIO-iommu system need to know
the MSI region to map its window in h/w. This patch just defines the
required weak functions only and will be used by followup patches.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
---
 drivers/pci/msi.c   |   22 ++++++++++++++++++++++
 include/linux/msi.h |   14 ++++++++++++++
 2 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index d5f90d6..2643a29 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -67,6 +67,28 @@ int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
 	return chip->check_device(chip, dev, nvec, type);
 }
 
+int __weak arch_msi_get_region_count(void)
+{
+	return 0;
+}
+
+int __weak arch_msi_get_region(int region_num, struct msi_region *region)
+{
+	return 0;
+}
+
+int msi_get_region_count(void)
+{
+	return arch_msi_get_region_count();
+}
+EXPORT_SYMBOL(msi_get_region_count);
+
+int msi_get_region(int region_num, struct msi_region *region)
+{
+	return arch_msi_get_region(region_num, region);
+}
+EXPORT_SYMBOL(msi_get_region);
+
 int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
 	struct msi_desc *entry;
diff --git a/include/linux/msi.h b/include/linux/msi.h
index b17ead8..0deedb4 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -51,6 +51,18 @@ struct msi_desc {
 };
 
 /*
+ * This structure is used to get
+ * 	- physical address
+ * 	- size
+ * of a msi region
+ */
+struct msi_region {
+	int region_num; /* MSI region number */
+	dma_addr_t addr; /* Address of MSI region */
+	size_t size; /* Size of MSI region */
+};
+
+/*
  * The arch hooks to setup up msi irqs. Those functions are
  * implemented as weak symbols so that they /can/ be overriden by
  * architecture specific code if needed.
@@ -64,6 +76,8 @@ void arch_restore_msi_irqs(struct pci_dev *dev, int irq);
 
 void default_teardown_msi_irqs(struct pci_dev *dev);
 void default_restore_msi_irqs(struct pci_dev *dev, int irq);
+int arch_msi_get_region_count(void);
+int arch_msi_get_region(int region_num, struct msi_region *region);
 
 struct msi_chip {
 	struct module *owner;
-- 
1.7.0.4

^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2013-10-29 11:34 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-10-29 11:27 [PATCH 1/5 RFC] pci:msi: add weak function for returning msi region info Bharat Bhushan
2013-10-29 11:27 ` [PATCH 4/5 RFC] pci: msi: expose msi region information functions Bharat Bhushan
2013-10-29 11:27 ` [PATCH 3/5 RFC] powerpc: msi: Extend the msi region interface to get info from fsl_msi Bharat Bhushan
2013-10-29 11:27 ` [PATCH 2/5 RFC] powerpc: pci: Add arch specific msi region interface Bharat Bhushan
2013-10-29 11:27 ` [PATCH 5/5 RFC] vfio: setup iova-base for msi interrupts for vfio assigned device Bharat Bhushan
2013-10-29 11:27 ` [PATCH 0/5 RFC] vfio/pci: add interface to for MSI support with FSL PAMU Bharat Bhushan

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