mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 05:34:13 +08:00
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
@ -70,18 +70,15 @@ Date: September, 2011
|
||||
Contact: Neil Horman <nhorman@tuxdriver.com>
|
||||
Description:
|
||||
The /sys/devices/.../msi_irqs directory contains a variable set
|
||||
of sub-directories, with each sub-directory being named after a
|
||||
corresponding msi irq vector allocated to that device. Each
|
||||
numbered sub-directory N contains attributes of that irq.
|
||||
Note that this directory is not created for device drivers which
|
||||
do not support msi irqs
|
||||
of files, with each file being named after a corresponding msi
|
||||
irq vector allocated to that device.
|
||||
|
||||
What: /sys/bus/pci/devices/.../msi_irqs/<N>/mode
|
||||
What: /sys/bus/pci/devices/.../msi_irqs/<N>
|
||||
Date: September 2011
|
||||
Contact: Neil Horman <nhorman@tuxdriver.com>
|
||||
Description:
|
||||
This attribute indicates the mode that the irq vector named by
|
||||
the parent directory is in (msi vs. msix)
|
||||
the file is in (msi vs. msix)
|
||||
|
||||
What: /sys/bus/pci/devices/.../remove
|
||||
Date: January 2009
|
||||
|
||||
@ -363,6 +363,9 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg)
|
||||
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 *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)
|
||||
@ -471,94 +490,95 @@ void pci_restore_msi_state(struct pci_dev *dev)
|
||||
}
|
||||
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");
|
||||
struct pci_dev *pdev = to_pci_dev(dev);
|
||||
struct msi_desc *entry;
|
||||
unsigned long irq;
|
||||
int retval;
|
||||
|
||||
retval = kstrtoul(attr->attr.name, 10, &irq);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
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 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);
|
||||
|
||||
|
||||
static struct attribute *msi_irq_default_attrs[] = {
|
||||
&mode_attribute.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static void msi_kobj_release(struct kobject *kobj)
|
||||
{
|
||||
struct msi_desc *entry = to_msi_desc(kobj);
|
||||
|
||||
pci_dev_put(entry->dev);
|
||||
}
|
||||
|
||||
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 attribute *msi_attr;
|
||||
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 ret = -ENOMEM;
|
||||
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;
|
||||
|
||||
/* 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) {
|
||||
char *name = kmalloc(20, GFP_KERNEL);
|
||||
msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
|
||||
if (!msi_dev_attr)
|
||||
goto error_attrs;
|
||||
sprintf(name, "%d", entry->irq);
|
||||
sysfs_attr_init(&msi_dev_attr->attr);
|
||||
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;
|
||||
}
|
||||
|
||||
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 = kzalloc(sizeof(void *) * 2, GFP_KERNEL);
|
||||
if (!msi_irq_groups)
|
||||
goto error_irq_group;
|
||||
msi_irq_groups[0] = msi_irq_group;
|
||||
|
||||
ret = sysfs_create_groups(&pdev->dev.kobj, msi_irq_groups);
|
||||
if (ret)
|
||||
goto error_irq_groups;
|
||||
pdev->msi_irq_groups = msi_irq_groups;
|
||||
|
||||
return 0;
|
||||
|
||||
out_unroll:
|
||||
list_for_each_entry(entry, &pdev->msi_list, list) {
|
||||
if (!count)
|
||||
break;
|
||||
kobject_del(&entry->kobj);
|
||||
kobject_put(&entry->kobj);
|
||||
count--;
|
||||
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];
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
@ -925,8 +945,6 @@ 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 +1041,6 @@ void pci_disable_msix(struct pci_dev *dev)
|
||||
|
||||
pci_msix_shutdown(dev);
|
||||
free_msi_irqs(dev);
|
||||
kset_unregister(dev->msi_kset);
|
||||
dev->msi_kset = NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(pci_disable_msix);
|
||||
|
||||
|
||||
@ -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
|
||||
|
||||
Loading…
Reference in New Issue
Block a user