PCI/sysfs: add per pci device msi[x] irq listing (v5)
This patch adds a per-pci-device subdirectory in sysfs called: /sys/bus/pci/devices/<device>/msi_irqs This sub-directory exports the set of msi vectors allocated by a given pci device, by creating a numbered sub-directory for each vector beneath msi_irqs. For each vector various attributes can be exported. Currently the only attribute is called mode, which tracks the operational mode of that vector (msi vs. msix) Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@ -66,6 +66,24 @@ Description:
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re-discover previously removed devices.
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Depends on CONFIG_HOTPLUG.
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What: /sys/bus/pci/devices/.../msi_irqs/
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Date: September, 2011
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Contact: Neil Horman <nhorman@tuxdriver.com>
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Description:
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The /sys/devices/.../msi_irqs directory contains a variable set
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of sub-directories, with each sub-directory being named after a
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corresponding msi irq vector allocated to that device. Each
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numbered sub-directory N contains attributes of that irq.
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Note that this directory is not created for device drivers which
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do not support msi irqs
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What: /sys/bus/pci/devices/.../msi_irqs/<N>/mode
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Date: September 2011
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Contact: Neil Horman <nhorman@tuxdriver.com>
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Description:
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This attribute indicates the mode that the irq vector named by
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the parent directory is in (msi vs. msix)
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What: /sys/bus/pci/devices/.../remove
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Date: January 2009
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Contact: Linux PCI developers <linux-pci@vger.kernel.org>
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@ -323,6 +323,8 @@ static void free_msi_irqs(struct pci_dev *dev)
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if (list_is_last(&entry->list, &dev->msi_list))
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iounmap(entry->mask_base);
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}
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kobject_del(&entry->kobj);
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kobject_put(&entry->kobj);
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list_del(&entry->list);
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kfree(entry);
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}
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@ -403,6 +405,98 @@ void pci_restore_msi_state(struct pci_dev *dev)
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}
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EXPORT_SYMBOL_GPL(pci_restore_msi_state);
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#define to_msi_attr(obj) container_of(obj, struct msi_attribute, attr)
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#define to_msi_desc(obj) container_of(obj, struct msi_desc, kobj)
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struct msi_attribute {
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struct attribute attr;
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ssize_t (*show)(struct msi_desc *entry, struct msi_attribute *attr,
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char *buf);
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ssize_t (*store)(struct msi_desc *entry, struct msi_attribute *attr,
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const char *buf, size_t count);
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};
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static ssize_t show_msi_mode(struct msi_desc *entry, struct msi_attribute *atr,
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char *buf)
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{
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return sprintf(buf, "%s\n", entry->msi_attrib.is_msix ? "msix" : "msi");
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}
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static ssize_t msi_irq_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct msi_attribute *attribute = to_msi_attr(attr);
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struct msi_desc *entry = to_msi_desc(kobj);
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if (!attribute->show)
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return -EIO;
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return attribute->show(entry, attribute, buf);
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}
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static const struct sysfs_ops msi_irq_sysfs_ops = {
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.show = msi_irq_attr_show,
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};
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static struct msi_attribute mode_attribute =
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__ATTR(mode, S_IRUGO, show_msi_mode, NULL);
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struct attribute *msi_irq_default_attrs[] = {
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&mode_attribute.attr,
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NULL
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};
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void msi_kobj_release(struct kobject *kobj)
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{
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struct msi_desc *entry = to_msi_desc(kobj);
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pci_dev_put(entry->dev);
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}
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static struct kobj_type msi_irq_ktype = {
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.release = msi_kobj_release,
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.sysfs_ops = &msi_irq_sysfs_ops,
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.default_attrs = msi_irq_default_attrs,
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};
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static int populate_msi_sysfs(struct pci_dev *pdev)
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{
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struct msi_desc *entry;
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struct kobject *kobj;
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int ret;
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int count = 0;
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pdev->msi_kset = kset_create_and_add("msi_irqs", NULL, &pdev->dev.kobj);
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if (!pdev->msi_kset)
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return -ENOMEM;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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kobj = &entry->kobj;
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kobj->kset = pdev->msi_kset;
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pci_dev_get(pdev);
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ret = kobject_init_and_add(kobj, &msi_irq_ktype, NULL,
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"%u", entry->irq);
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if (ret)
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goto out_unroll;
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count++;
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}
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return 0;
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out_unroll:
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list_for_each_entry(entry, &pdev->msi_list, list) {
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if (!count)
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break;
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kobject_del(&entry->kobj);
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kobject_put(&entry->kobj);
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count--;
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}
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return ret;
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}
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/**
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* msi_capability_init - configure device's MSI capability structure
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* @dev: pointer to the pci_dev data structure of MSI device function
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@ -454,6 +548,13 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
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return ret;
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}
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ret = populate_msi_sysfs(dev);
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if (ret) {
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msi_mask_irq(entry, mask, ~mask);
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free_msi_irqs(dev);
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return ret;
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}
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/* Set MSI enabled bits */
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pci_intx_for_msi(dev, 0);
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msi_set_enable(dev, pos, 1);
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@ -574,6 +675,12 @@ static int msix_capability_init(struct pci_dev *dev,
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msix_program_entries(dev, entries);
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ret = populate_msi_sysfs(dev);
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if (ret) {
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ret = 0;
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goto error;
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}
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/* Set MSI-X enabled bits and unmask the function */
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pci_intx_for_msi(dev, 0);
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dev->msix_enabled = 1;
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@ -732,6 +839,8 @@ void pci_disable_msi(struct pci_dev *dev)
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pci_msi_shutdown(dev);
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free_msi_irqs(dev);
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kset_unregister(dev->msi_kset);
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dev->msi_kset = NULL;
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}
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EXPORT_SYMBOL(pci_disable_msi);
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@ -830,6 +939,8 @@ void pci_disable_msix(struct pci_dev *dev)
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pci_msix_shutdown(dev);
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free_msi_irqs(dev);
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kset_unregister(dev->msi_kset);
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dev->msi_kset = NULL;
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}
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EXPORT_SYMBOL(pci_disable_msix);
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@ -1,6 +1,7 @@
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#ifndef LINUX_MSI_H
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#define LINUX_MSI_H
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#include <linux/kobject.h>
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#include <linux/list.h>
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struct msi_msg {
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/* Last set MSI message */
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struct msi_msg msg;
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struct kobject kobj;
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};
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/*
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@ -336,6 +336,7 @@ struct pci_dev {
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struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */
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#ifdef CONFIG_PCI_MSI
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struct list_head msi_list;
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struct kset *msi_kset;
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#endif
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struct pci_vpd *vpd;
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#ifdef CONFIG_PCI_ATS
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