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PCI/P2PDMA: Add sysfs group to display p2pmem stats 

Add a sysfs group to display statistics about P2P memory that is registered
in each PCI device.

Attributes in the group display the total amount of P2P memory, the amount
available and whether it is published or not.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Logan Gunthorpe 2018-10-04 15:27:36 -06:00 committed by Bjorn Helgaas
parent 52916982af
commit cbb8ca69fc
2 changed files with 78 additions and 0 deletions
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24
Documentation/ABI/testing/sysfs-bus-pci
View File

@ -323,3 +323,27 @@ Description:
This is similar to /sys/bus/pci/drivers_autoprobe, but
affects only the VFs associated with a specific PF.
What: /sys/bus/pci/devices/.../p2pmem/size
Date: November 2017
Contact: Logan Gunthorpe <logang@deltatee.com>
Description:
If the device has any Peer-to-Peer memory registered, this
file contains the total amount of memory that the device
provides (in decimal).
What: /sys/bus/pci/devices/.../p2pmem/available
Date: November 2017
Contact: Logan Gunthorpe <logang@deltatee.com>
Description:
If the device has any Peer-to-Peer memory registered, this
file contains the amount of memory that has not been
allocated (in decimal).
What: /sys/bus/pci/devices/.../p2pmem/published
Date: November 2017
Contact: Logan Gunthorpe <logang@deltatee.com>
Description:
If the device has any Peer-to-Peer memory registered, this
file contains a '1' if the memory has been published for
use outside the driver that owns the device.

54
drivers/pci/p2pdma.c
View File

@ -24,6 +24,54 @@ struct pci_p2pdma {
bool p2pmem_published;
};
static ssize_t size_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
size_t size = 0;
if (pdev->p2pdma->pool)
size = gen_pool_size(pdev->p2pdma->pool);
return snprintf(buf, PAGE_SIZE, "%zd\n", size);
}
static DEVICE_ATTR_RO(size);
static ssize_t available_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
size_t avail = 0;
if (pdev->p2pdma->pool)
avail = gen_pool_avail(pdev->p2pdma->pool);
return snprintf(buf, PAGE_SIZE, "%zd\n", avail);
}
static DEVICE_ATTR_RO(available);
static ssize_t published_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
return snprintf(buf, PAGE_SIZE, "%d\n",
pdev->p2pdma->p2pmem_published);
}
static DEVICE_ATTR_RO(published);
static struct attribute *p2pmem_attrs[] = {
&dev_attr_size.attr,
&dev_attr_available.attr,
&dev_attr_published.attr,
NULL,
};
static const struct attribute_group p2pmem_group = {
.attrs = p2pmem_attrs,
.name = "p2pmem",
};
static void pci_p2pdma_percpu_release(struct percpu_ref *ref)
{
struct pci_p2pdma *p2p =
@ -59,6 +107,7 @@ static void pci_p2pdma_release(void *data)
percpu_ref_exit(&pdev->p2pdma->devmap_ref);
gen_pool_destroy(pdev->p2pdma->pool);
sysfs_remove_group(&pdev->dev.kobj, &p2pmem_group);
pdev->p2pdma = NULL;
}
@ -87,9 +136,14 @@ static int pci_p2pdma_setup(struct pci_dev *pdev)
pdev->p2pdma = p2p;
error = sysfs_create_group(&pdev->dev.kobj, &p2pmem_group);
if (error)
goto out_pool_destroy;
return 0;
out_pool_destroy:
pdev->p2pdma = NULL;
gen_pool_destroy(p2p->pool);
out:
devm_kfree(&pdev->dev, p2p);