diff options
Diffstat (limited to 'kernel/irq/msi.c')
| -rw-r--r-- | kernel/irq/msi.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index bb18040efbe8..48ef144649e3 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -14,6 +14,7 @@ #include <linux/irqdomain.h> #include <linux/msi.h> #include <linux/slab.h> +#include <linux/pci.h> #include "internals.h" @@ -71,6 +72,139 @@ void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg) } EXPORT_SYMBOL_GPL(get_cached_msi_msg); +static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct msi_desc *entry; + bool is_msix = false; + unsigned long irq; + int retval; + + retval = kstrtoul(attr->attr.name, 10, &irq); + if (retval) + return retval; + + entry = irq_get_msi_desc(irq); + if (!entry) + return -ENODEV; + + if (dev_is_pci(dev)) + is_msix = entry->msi_attrib.is_msix; + + return sysfs_emit(buf, "%s\n", is_msix ? "msix" : "msi"); +} + +/** + * msi_populate_sysfs - Populate msi_irqs sysfs entries for devices + * @dev: The device(PCI, platform etc) who will get sysfs entries + * + * Return attribute_group ** so that specific bus MSI can save it to + * somewhere during initilizing msi irqs. If devices has no MSI irq, + * return NULL; if it fails to populate sysfs, return ERR_PTR + */ +const struct attribute_group **msi_populate_sysfs(struct device *dev) +{ + const struct attribute_group **msi_irq_groups; + struct attribute **msi_attrs, *msi_attr; + struct device_attribute *msi_dev_attr; + struct attribute_group *msi_irq_group; + struct msi_desc *entry; + int ret = -ENOMEM; + int num_msi = 0; + int count = 0; + int i; + + /* Determine how many msi entries we have */ + for_each_msi_entry(entry, dev) + num_msi += entry->nvec_used; + if (!num_msi) + return NULL; + + /* Dynamically create the MSI attributes for the device */ + msi_attrs = kcalloc(num_msi + 1, sizeof(void *), GFP_KERNEL); + if (!msi_attrs) + return ERR_PTR(-ENOMEM); + + for_each_msi_entry(entry, dev) { + 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 = 0444; + msi_dev_attr->show = msi_mode_show; + ++count; + } + } + + msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL); + if (!msi_irq_group) + goto error_attrs; + msi_irq_group->name = "msi_irqs"; + msi_irq_group->attrs = msi_attrs; + + msi_irq_groups = kcalloc(2, sizeof(void *), GFP_KERNEL); + if (!msi_irq_groups) + goto error_irq_group; + msi_irq_groups[0] = msi_irq_group; + + ret = sysfs_create_groups(&dev->kobj, msi_irq_groups); + if (ret) + goto error_irq_groups; + + return msi_irq_groups; + +error_irq_groups: + kfree(msi_irq_groups); +error_irq_group: + kfree(msi_irq_group); +error_attrs: + count = 0; + msi_attr = msi_attrs[count]; + while (msi_attr) { + msi_dev_attr = container_of(msi_attr, struct device_attribute, attr); + kfree(msi_attr->name); + kfree(msi_dev_attr); + ++count; + msi_attr = msi_attrs[count]; + } + kfree(msi_attrs); + return ERR_PTR(ret); +} + +/** + * msi_destroy_sysfs - Destroy msi_irqs sysfs entries for devices + * @dev: The device(PCI, platform etc) who will remove sysfs entries + * @msi_irq_groups: attribute_group for device msi_irqs entries + */ +void msi_destroy_sysfs(struct device *dev, const struct attribute_group **msi_irq_groups) +{ + struct device_attribute *dev_attr; + struct attribute **msi_attrs; + int count = 0; + + if (msi_irq_groups) { + sysfs_remove_groups(&dev->kobj, msi_irq_groups); + msi_attrs = msi_irq_groups[0]->attrs; + while (msi_attrs[count]) { + dev_attr = container_of(msi_attrs[count], + struct device_attribute, attr); + kfree(dev_attr->attr.name); + kfree(dev_attr); + ++count; + } + kfree(msi_attrs); + kfree(msi_irq_groups[0]); + kfree(msi_irq_groups); + } +} + #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN static inline void irq_chip_write_msi_msg(struct irq_data *data, struct msi_msg *msg) |