PCI/MSI: Export MSI mode using attributes, not kobjects
The PCI MSI sysfs code is a mess with kobjects for things that don't really
need to be kobjects. This patch creates attributes dynamically for the MSI
interrupts instead of using kobjects.
Note, this removes a directory from sysfs. Old MSI kobjects:
pci_device
└── msi_irqs
└── 40
└── mode
New MSI attributes:
pci_device
└── msi_irqs
└── 40
As there was only one file "mode" with the kobject model, the interrupt
number is now a file that returns the "mode" of the interrupt (msi vs.
msix).
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
This commit is contained in:
Greg Kroah-Hartman
Bjorn Helgaas
parent
6ce4eac1f6
commit
1c51b50c29
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@ -70,18 +70,15 @@ 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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of files, with each file being named after a corresponding msi
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irq vector allocated to that device.
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What: /sys/bus/pci/devices/.../msi_irqs/<N>/mode
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What: /sys/bus/pci/devices/.../msi_irqs/<N>
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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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the file 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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@ -363,6 +363,9 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg)
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static void free_msi_irqs(struct pci_dev *dev)
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{
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struct msi_desc *entry, *tmp;
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struct attribute **msi_attrs;
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struct device_attribute *dev_attr;
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int count = 0;
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list_for_each_entry(entry, &dev->msi_list, list) {
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int i, nvec;
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@ -398,6 +401,22 @@ static void free_msi_irqs(struct pci_dev *dev)
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list_del(&entry->list);
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kfree(entry);
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}
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if (dev->msi_irq_groups) {
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sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups);
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msi_attrs = dev->msi_irq_groups[0]->attrs;
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list_for_each_entry(entry, &dev->msi_list, list) {
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dev_attr = container_of(msi_attrs[count],
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struct device_attribute, attr);
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kfree(dev_attr->attr.name);
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kfree(dev_attr);
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++count;
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}
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kfree(msi_attrs);
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kfree(dev->msi_irq_groups[0]);
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kfree(dev->msi_irq_groups);
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dev->msi_irq_groups = NULL;
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}
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}
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static struct msi_desc *alloc_msi_entry(struct pci_dev *dev)
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@ -471,94 +490,95 @@ 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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static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
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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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struct pci_dev *pdev = to_pci_dev(dev);
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struct msi_desc *entry;
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unsigned long irq;
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int retval;
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retval = kstrtoul(attr->attr.name, 10, &irq);
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if (retval)
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return retval;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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if (entry->irq == irq) {
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return sprintf(buf, "%s\n",
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entry->msi_attrib.is_msix ? "msix" : "msi");
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}
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}
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return -ENODEV;
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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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static 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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static 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 attribute **msi_attrs;
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struct attribute *msi_attr;
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struct device_attribute *msi_dev_attr;
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struct attribute_group *msi_irq_group;
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const struct attribute_group **msi_irq_groups;
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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 ret = -ENOMEM;
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int num_msi = 0;
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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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/* Determine how many msi entries we have */
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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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++num_msi;
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}
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if (!num_msi)
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return 0;
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/* Dynamically create the MSI attributes for the PCI device */
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msi_attrs = kzalloc(sizeof(void *) * (num_msi + 1), GFP_KERNEL);
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if (!msi_attrs)
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return -ENOMEM;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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char *name = kmalloc(20, GFP_KERNEL);
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msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
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if (!msi_dev_attr)
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goto error_attrs;
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sprintf(name, "%d", entry->irq);
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sysfs_attr_init(&msi_dev_attr->attr);
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msi_dev_attr->attr.name = name;
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msi_dev_attr->attr.mode = S_IRUGO;
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msi_dev_attr->show = msi_mode_show;
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msi_attrs[count] = &msi_dev_attr->attr;
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++count;
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}
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msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL);
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if (!msi_irq_group)
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goto error_attrs;
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msi_irq_group->name = "msi_irqs";
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msi_irq_group->attrs = msi_attrs;
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msi_irq_groups = kzalloc(sizeof(void *) * 2, GFP_KERNEL);
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if (!msi_irq_groups)
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goto error_irq_group;
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msi_irq_groups[0] = msi_irq_group;
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ret = sysfs_create_groups(&pdev->dev.kobj, msi_irq_groups);
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if (ret)
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goto error_irq_groups;
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pdev->msi_irq_groups = msi_irq_groups;
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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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error_irq_groups:
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kfree(msi_irq_groups);
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error_irq_group:
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kfree(msi_irq_group);
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error_attrs:
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count = 0;
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msi_attr = msi_attrs[count];
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while (msi_attr) {
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msi_dev_attr = container_of(msi_attr, struct device_attribute, attr);
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kfree(msi_attr->name);
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kfree(msi_dev_attr);
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++count;
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msi_attr = msi_attrs[count];
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}
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return ret;
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}
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@ -925,8 +945,6 @@ 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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@ -1023,8 +1041,6 @@ 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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@ -351,7 +351,7 @@ 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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const struct attribute_group **msi_irq_groups;
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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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