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Diffstat (limited to 'drivers/base/platform-msi.c')
-rw-r--r--drivers/base/platform-msi.c125
1 files changed, 108 insertions, 17 deletions
diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index f37ad34c80..11f5fdf65b 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -13,6 +13,8 @@
#include <linux/msi.h>
#include <linux/slab.h>
+/* Begin of removal area. Once everything is converted over. Cleanup the includes too! */
+
#define DEV_ID_SHIFT 21
#define MAX_DEV_MSIS (1 << (32 - DEV_ID_SHIFT))
@@ -172,8 +174,8 @@ static int platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
if (!datap)
return -ENOMEM;
- datap->devid = ida_simple_get(&platform_msi_devid_ida,
- 0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
+ datap->devid = ida_alloc_max(&platform_msi_devid_ida,
+ (1 << DEV_ID_SHIFT) - 1, GFP_KERNEL);
if (datap->devid < 0) {
err = datap->devid;
kfree(datap);
@@ -191,7 +193,7 @@ static void platform_msi_free_priv_data(struct device *dev)
struct platform_msi_priv_data *data = dev->msi.data->platform_data;
dev->msi.data->platform_data = NULL;
- ida_simple_remove(&platform_msi_devid_ida, data->devid);
+ ida_free(&platform_msi_devid_ida, data->devid);
kfree(data);
}
@@ -204,8 +206,8 @@ static void platform_msi_free_priv_data(struct device *dev)
* Returns:
* Zero for success, or an error code in case of failure
*/
-int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
- irq_write_msi_msg_t write_msi_msg)
+static int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
+ irq_write_msi_msg_t write_msi_msg)
{
int err;
@@ -219,18 +221,6 @@ int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
return err;
}
-EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs);
-
-/**
- * platform_msi_domain_free_irqs - Free MSI interrupts for @dev
- * @dev: The device for which to free interrupts
- */
-void platform_msi_domain_free_irqs(struct device *dev)
-{
- msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN);
- platform_msi_free_priv_data(dev);
-}
-EXPORT_SYMBOL_GPL(platform_msi_domain_free_irqs);
/**
* platform_msi_get_host_data - Query the private data associated with
@@ -350,3 +340,104 @@ int platform_msi_device_domain_alloc(struct irq_domain *domain, unsigned int vir
return msi_domain_populate_irqs(domain->parent, dev, virq, nr_irqs, &data->arg);
}
+
+/* End of removal area */
+
+/* Real per device domain interfaces */
+
+/*
+ * This indirection can go when platform_device_msi_init_and_alloc_irqs()
+ * is switched to a proper irq_chip::irq_write_msi_msg() callback. Keep it
+ * simple for now.
+ */
+static void platform_msi_write_msi_msg(struct irq_data *d, struct msi_msg *msg)
+{
+ irq_write_msi_msg_t cb = d->chip_data;
+
+ cb(irq_data_get_msi_desc(d), msg);
+}
+
+static void platform_msi_set_desc_byindex(msi_alloc_info_t *arg, struct msi_desc *desc)
+{
+ arg->desc = desc;
+ arg->hwirq = desc->msi_index;
+}
+
+static const struct msi_domain_template platform_msi_template = {
+ .chip = {
+ .name = "pMSI",
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_write_msi_msg = platform_msi_write_msi_msg,
+ /* The rest is filled in by the platform MSI parent */
+ },
+
+ .ops = {
+ .set_desc = platform_msi_set_desc_byindex,
+ },
+
+ .info = {
+ .bus_token = DOMAIN_BUS_DEVICE_MSI,
+ },
+};
+
+/**
+ * platform_device_msi_init_and_alloc_irqs - Initialize platform device MSI
+ * and allocate interrupts for @dev
+ * @dev: The device for which to allocate interrupts
+ * @nvec: The number of interrupts to allocate
+ * @write_msi_msg: Callback to write an interrupt message for @dev
+ *
+ * Returns:
+ * Zero for success, or an error code in case of failure
+ *
+ * This creates a MSI domain on @dev which has @dev->msi.domain as
+ * parent. The parent domain sets up the new domain. The domain has
+ * a fixed size of @nvec. The domain is managed by devres and will
+ * be removed when the device is removed.
+ *
+ * Note: For migration purposes this falls back to the original platform_msi code
+ * up to the point where all platforms have been converted to the MSI
+ * parent model.
+ */
+int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nvec,
+ irq_write_msi_msg_t write_msi_msg)
+{
+ struct irq_domain *domain = dev->msi.domain;
+
+ if (!domain || !write_msi_msg)
+ return -EINVAL;
+
+ /* Migration support. Will go away once everything is converted */
+ if (!irq_domain_is_msi_parent(domain))
+ return platform_msi_domain_alloc_irqs(dev, nvec, write_msi_msg);
+
+ /*
+ * @write_msi_msg is stored in the resulting msi_domain_info::data.
+ * The underlying domain creation mechanism will assign that
+ * callback to the resulting irq chip.
+ */
+ if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN,
+ &platform_msi_template,
+ nvec, NULL, write_msi_msg))
+ return -ENODEV;
+
+ return msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, nvec - 1);
+}
+EXPORT_SYMBOL_GPL(platform_device_msi_init_and_alloc_irqs);
+
+/**
+ * platform_device_msi_free_irqs_all - Free all interrupts for @dev
+ * @dev: The device for which to free interrupts
+ */
+void platform_device_msi_free_irqs_all(struct device *dev)
+{
+ struct irq_domain *domain = dev->msi.domain;
+
+ msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN);
+
+ /* Migration support. Will go away once everything is converted */
+ if (!irq_domain_is_msi_parent(domain))
+ platform_msi_free_priv_data(dev);
+}
+EXPORT_SYMBOL_GPL(platform_device_msi_free_irqs_all);