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path: root/drivers/pci/msi.c
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Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c101
1 files changed, 78 insertions, 23 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 4a7da3c3e..7eaa4c87f 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"
@@ -53,7 +54,7 @@ static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
struct irq_domain *domain;
domain = pci_msi_get_domain(dev);
- if (domain)
+ if (domain && irq_domain_is_hierarchy(domain))
return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
return arch_setup_msi_irqs(dev, nvec, type);
@@ -64,7 +65,7 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
struct irq_domain *domain;
domain = pci_msi_get_domain(dev);
- if (domain)
+ if (domain && irq_domain_is_hierarchy(domain))
pci_msi_domain_free_irqs(domain, dev);
else
arch_teardown_msi_irqs(dev);
@@ -105,9 +106,12 @@ void __weak arch_teardown_msi_irq(unsigned int irq)
int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
+ struct msi_controller *chip = dev->bus->msi;
struct msi_desc *entry;
int ret;
+ if (chip && chip->setup_irqs)
+ return chip->setup_irqs(chip, dev, nvec, type);
/*
* If an architecture wants to support multiple MSI, it needs to
* override arch_setup_msi_irqs()
@@ -475,10 +479,11 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
int ret = -ENOMEM;
int num_msi = 0;
int count = 0;
+ int i;
/* Determine how many msi entries we have */
for_each_pci_msi_entry(entry, pdev)
- ++num_msi;
+ num_msi += entry->nvec_used;
if (!num_msi)
return 0;
@@ -487,19 +492,21 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
if (!msi_attrs)
return -ENOMEM;
for_each_pci_msi_entry(entry, pdev) {
- msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
- if (!msi_dev_attr)
- goto error_attrs;
- msi_attrs[count] = &msi_dev_attr->attr;
-
- sysfs_attr_init(&msi_dev_attr->attr);
- msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
- entry->irq);
- if (!msi_dev_attr->attr.name)
- goto error_attrs;
- msi_dev_attr->attr.mode = S_IRUGO;
- msi_dev_attr->show = msi_mode_show;
- ++count;
+ for (i = 0; i < entry->nvec_used; i++) {
+ msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
+ if (!msi_dev_attr)
+ goto error_attrs;
+ msi_attrs[count] = &msi_dev_attr->attr;
+
+ sysfs_attr_init(&msi_dev_attr->attr);
+ msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
+ entry->irq + i);
+ if (!msi_dev_attr->attr.name)
+ goto error_attrs;
+ msi_dev_attr->attr.mode = S_IRUGO;
+ msi_dev_attr->show = msi_mode_show;
+ ++count;
+ }
}
msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL);
@@ -1250,8 +1257,8 @@ 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 +1267,7 @@ 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 +1278,7 @@ 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 +1314,14 @@ 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 +1331,59 @@ 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 */