Messages in this thread | | | Date | Fri, 29 Nov 2013 10:41:37 +0100 | From | Veaceslav Falico <> | Subject | Re: [PATCH] PCI: export MSI mode using attributes, not kobjects |
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On Wed, Nov 27, 2013 at 10:46:52AM -0800, Greg Kroah-Hartman wrote: >From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > >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 the current MSI interrupt sysfs >code: > >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>
Works like a charm for me.
FWIW,
Reviewed-by: Veaceslav Falico <vfalico@redhat.com>
> >--- > >Neil, can you test this patch to see if irqbalance works as-is or not? > >thanks, > >greg k-h > > drivers/pci/msi.c | 152 +++++++++++++++++++++++++--------------------------- > include/linux/pci.h | 2 > 2 files changed, 76 insertions(+), 78 deletions(-) > >--- a/drivers/pci/msi.c >+++ b/drivers/pci/msi.c >@@ -363,6 +363,9 @@ void write_msi_msg(unsigned int irq, str > static void free_msi_irqs(struct pci_dev *dev) > { > struct msi_desc *entry, *tmp; >+ struct attribute **msi_attrs; >+ struct device_attribute *dev_attr; >+ int count = 0; > > list_for_each_entry(entry, &dev->msi_list, list) { > int i, nvec; >@@ -398,6 +401,22 @@ static void free_msi_irqs(struct pci_dev > list_del(&entry->list); > kfree(entry); > } >+ >+ if (dev->msi_irq_groups) { >+ sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups); >+ msi_attrs = dev->msi_irq_groups[0]->attrs; >+ list_for_each_entry(entry, &dev->msi_list, list) { >+ dev_attr = container_of(msi_attrs[count], >+ struct device_attribute, attr); >+ kfree(dev_attr->attr.name); >+ kfree(dev_attr); >+ ++count; >+ } >+ kfree(msi_attrs); >+ kfree(dev->msi_irq_groups[0]); >+ kfree(dev->msi_irq_groups); >+ dev->msi_irq_groups = NULL; >+ } > } > > static struct msi_desc *alloc_msi_entry(struct pci_dev *dev) >@@ -471,96 +490,79 @@ void pci_restore_msi_state(struct pci_de > } > EXPORT_SYMBOL_GPL(pci_restore_msi_state); > >- >-#define to_msi_attr(obj) container_of(obj, struct msi_attribute, attr) >-#define to_msi_desc(obj) container_of(obj, struct msi_desc, kobj) >- >-struct msi_attribute { >- struct attribute attr; >- ssize_t (*show)(struct msi_desc *entry, struct msi_attribute *attr, >- char *buf); >- ssize_t (*store)(struct msi_desc *entry, struct msi_attribute *attr, >- const char *buf, size_t count); >-}; >- >-static ssize_t show_msi_mode(struct msi_desc *entry, struct msi_attribute *atr, >+static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr, > char *buf) > { >- return sprintf(buf, "%s\n", entry->msi_attrib.is_msix ? "msix" : "msi"); >-} >- >-static ssize_t msi_irq_attr_show(struct kobject *kobj, >- struct attribute *attr, char *buf) >-{ >- struct msi_attribute *attribute = to_msi_attr(attr); >- struct msi_desc *entry = to_msi_desc(kobj); >- >- if (!attribute->show) >- return -EIO; >- >- return attribute->show(entry, attribute, buf); >-} >- >-static const struct sysfs_ops msi_irq_sysfs_ops = { >- .show = msi_irq_attr_show, >-}; >- >-static struct msi_attribute mode_attribute = >- __ATTR(mode, S_IRUGO, show_msi_mode, NULL); >- >+ struct pci_dev *pdev = to_pci_dev(dev); >+ struct msi_desc *entry; >+ unsigned long irq; >+ int retval; > >-static struct attribute *msi_irq_default_attrs[] = { >- &mode_attribute.attr, >- NULL >-}; >+ retval = kstrtoul(attr->attr.name, 10, &irq); >+ if (retval) >+ return retval; > >-static void msi_kobj_release(struct kobject *kobj) >-{ >- struct msi_desc *entry = to_msi_desc(kobj); >- >- pci_dev_put(entry->dev); >+ list_for_each_entry(entry, &pdev->msi_list, list) { >+ if (entry->irq == irq) { >+ return sprintf(buf, "%s\n", >+ entry->msi_attrib.is_msix ? "msix" : "msi"); >+ } >+ } >+ return -ENODEV; > } > >-static struct kobj_type msi_irq_ktype = { >- .release = msi_kobj_release, >- .sysfs_ops = &msi_irq_sysfs_ops, >- .default_attrs = msi_irq_default_attrs, >-}; >- > static int populate_msi_sysfs(struct pci_dev *pdev) > { >+ struct attribute **msi_attrs; >+ struct device_attribute *msi_dev_attr; >+ struct attribute_group *msi_irq_group; >+ const struct attribute_group **msi_irq_groups; > struct msi_desc *entry; >- struct kobject *kobj; > int ret; >+ int num_msi = 0; > int count = 0; > >- pdev->msi_kset = kset_create_and_add("msi_irqs", NULL, &pdev->dev.kobj); >- if (!pdev->msi_kset) >- return -ENOMEM; >- >+ /* Determine how many msi entries we have */ > list_for_each_entry(entry, &pdev->msi_list, list) { >- kobj = &entry->kobj; >- kobj->kset = pdev->msi_kset; >- pci_dev_get(pdev); >- ret = kobject_init_and_add(kobj, &msi_irq_ktype, NULL, >- "%u", entry->irq); >- if (ret) >- goto out_unroll; >- >- count++; >+ ++num_msi; > } >+ if (!num_msi) >+ return 0; > >- return 0; >- >-out_unroll: >+ /* Dynamically create the MSI attributes for the PCI device */ >+ msi_attrs = kzalloc(sizeof(void *) * (num_msi + 1), GFP_KERNEL); >+ if (!msi_attrs) >+ return -ENOMEM; > list_for_each_entry(entry, &pdev->msi_list, list) { >- if (!count) >- break; >- kobject_del(&entry->kobj); >- kobject_put(&entry->kobj); >- count--; >+ char *name = kmalloc(20, GFP_KERNEL); >+ msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL); >+ if (!msi_dev_attr) >+ return -ENOMEM; >+ sprintf(name, "%d", entry->irq); >+ msi_dev_attr->attr.name = name; >+ msi_dev_attr->attr.mode = S_IRUGO; >+ msi_dev_attr->show = msi_mode_show; >+ msi_attrs[count] = &msi_dev_attr->attr; >+ ++count; > } >- return ret; >+ >+ msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL); >+ if (!msi_irq_group) >+ return -ENOMEM; >+ msi_irq_group->name = "msi_irqs"; >+ msi_irq_group->attrs = msi_attrs; >+ >+ msi_irq_groups = kzalloc(sizeof(void *) * 2, GFP_KERNEL); >+ if (!msi_irq_groups) >+ return -ENOMEM; >+ msi_irq_groups[0] = msi_irq_group; >+ >+ ret = sysfs_create_groups(&pdev->dev.kobj, msi_irq_groups); >+ if (ret) >+ return ret; >+ pdev->msi_irq_groups = msi_irq_groups; >+ >+ return 0; > } > > /** >@@ -925,8 +927,6 @@ void pci_disable_msi(struct pci_dev *dev > > pci_msi_shutdown(dev); > free_msi_irqs(dev); >- kset_unregister(dev->msi_kset); >- dev->msi_kset = NULL; > } > EXPORT_SYMBOL(pci_disable_msi); > >@@ -1023,8 +1023,6 @@ void pci_disable_msix(struct pci_dev *de > > pci_msix_shutdown(dev); > free_msi_irqs(dev); >- kset_unregister(dev->msi_kset); >- dev->msi_kset = NULL; > } > EXPORT_SYMBOL(pci_disable_msix); > >--- a/include/linux/pci.h >+++ b/include/linux/pci.h >@@ -351,7 +351,7 @@ struct pci_dev { > struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */ > #ifdef CONFIG_PCI_MSI > struct list_head msi_list; >- struct kset *msi_kset; >+ const struct attribute_group **msi_irq_groups; > #endif > struct pci_vpd *vpd; > #ifdef CONFIG_PCI_ATS -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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