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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 01:40:01 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 01:40:01 +0300
commit6aa2fdb87cf01d7746955c600cbac352dc04d451 (patch)
tree75ba04b2579fafb103dfa049289e7e6b7b3d5bb9 /drivers/pci/msi.c
parent7b2a4306f9e7d64bb408a6df3bb419500578068a (diff)
parentd9e4ad5badf4ccbfddee208c898fb8fd0c8836b1 (diff)
downloadlinux-6aa2fdb87cf01d7746955c600cbac352dc04d451.tar.xz
Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq updates from Thomas Gleixner: "The irq departement delivers: - Rework the irqdomain core infrastructure to accomodate ACPI based systems. This is required to support ARM64 without creating artificial device tree nodes. - Sanitize the ACPI based ARM GIC initialization by making use of the new firmware independent irqdomain core - Further improvements to the generic MSI management - Generalize the irq migration on CPU hotplug - Improvements to the threaded interrupt infrastructure - Allow the migration of "chained" low level interrupt handlers - Allow optional force masking of interrupts in disable_irq[_nosysnc] - Support for two new interrupt chips - Sigh! - A larger set of errata fixes for ARM gicv3 - The usual pile of fixes, updates, improvements and cleanups all over the place" * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (71 commits) Document that IRQ_NONE should be returned when IRQ not actually handled PCI/MSI: Allow the MSI domain to be device-specific PCI: Add per-device MSI domain hook of/irq: Use the msi-map property to provide device-specific MSI domain of/irq: Split of_msi_map_rid to reuse msi-map lookup irqchip/gic-v3-its: Parse new version of msi-parent property PCI/MSI: Use of_msi_get_domain instead of open-coded "msi-parent" parsing of/irq: Use of_msi_get_domain instead of open-coded "msi-parent" parsing of/irq: Add support code for multi-parent version of "msi-parent" irqchip/gic-v3-its: Add handling of PCI requester id. PCI/MSI: Add helper function pci_msi_domain_get_msi_rid(). of/irq: Add new function of_msi_map_rid() Docs: dt: Add PCI MSI map bindings irqchip/gic-v2m: Add support for multiple MSI frames irqchip/gic-v3: Fix translation of LPIs after conversion to irq_fwspec irqchip/mxs: Add Alphascale ASM9260 support irqchip/mxs: Prepare driver for hardware with different offsets irqchip/mxs: Panic if ioremap or domain creation fails irqdomain: Documentation updates irqdomain/msi: Use fwnode instead of of_node ...
Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c63
1 files changed, 56 insertions, 7 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 4a7da3c3e035..45a51486d080 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -20,6 +20,7 @@
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/irqdomain.h>
+#include <linux/of_irq.h>
#include "pci.h"
@@ -1250,8 +1251,8 @@ static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
}
/**
- * pci_msi_create_irq_domain - Creat a MSI interrupt domain
- * @node: Optional device-tree node of the interrupt controller
+ * pci_msi_create_irq_domain - Create a MSI interrupt domain
+ * @fwnode: Optional fwnode of the interrupt controller
* @info: MSI domain info
* @parent: Parent irq domain
*
@@ -1260,7 +1261,7 @@ static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
* Returns:
* A domain pointer or NULL in case of failure.
*/
-struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
+struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
struct msi_domain_info *info,
struct irq_domain *parent)
{
@@ -1271,7 +1272,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct device_node *node,
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
pci_msi_domain_update_chip_ops(info);
- domain = msi_create_irq_domain(node, info, parent);
+ domain = msi_create_irq_domain(fwnode, info, parent);
if (!domain)
return NULL;
@@ -1307,14 +1308,14 @@ void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
/**
* pci_msi_create_default_irq_domain - Create a default MSI interrupt domain
- * @node: Optional device-tree node of the interrupt controller
+ * @fwnode: Optional fwnode of the interrupt controller
* @info: MSI domain info
* @parent: Parent irq domain
*
* Returns: A domain pointer or NULL in case of failure. If successful
* the default PCI/MSI irqdomain pointer is updated.
*/
-struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
+struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnode,
struct msi_domain_info *info, struct irq_domain *parent)
{
struct irq_domain *domain;
@@ -1324,11 +1325,59 @@ struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
pr_err("PCI: default irq domain for PCI MSI has already been created.\n");
domain = NULL;
} else {
- domain = pci_msi_create_irq_domain(node, info, parent);
+ domain = pci_msi_create_irq_domain(fwnode, info, parent);
pci_msi_default_domain = domain;
}
mutex_unlock(&pci_msi_domain_lock);
return domain;
}
+
+static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
+{
+ u32 *pa = data;
+
+ *pa = alias;
+ return 0;
+}
+/**
+ * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
+ * @domain: The interrupt domain
+ * @pdev: The PCI device.
+ *
+ * The RID for a device is formed from the alias, with a firmware
+ * supplied mapping applied
+ *
+ * Returns: The RID.
+ */
+u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
+{
+ struct device_node *of_node;
+ u32 rid = 0;
+
+ pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
+
+ of_node = irq_domain_get_of_node(domain);
+ if (of_node)
+ rid = of_msi_map_rid(&pdev->dev, of_node, rid);
+
+ return rid;
+}
+
+/**
+ * pci_msi_get_device_domain - Get the MSI domain for a given PCI device
+ * @pdev: The PCI device
+ *
+ * Use the firmware data to find a device-specific MSI domain
+ * (i.e. not one that is ste as a default).
+ *
+ * Returns: The coresponding MSI domain or NULL if none has been found.
+ */
+struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
+{
+ u32 rid = 0;
+
+ pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
+ return of_msi_map_get_device_domain(&pdev->dev, rid);
+}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */