PCI/P2PDMA: Add sysfs group to display p2pmem stats (cbb8ca69) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-bus-pci

+24 −0

Original line number	Diff line number	Diff line
		@@ -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.

drivers/pci/p2pdma.c

+54 −0

Original line number	Diff line number	Diff line
		@@ -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);

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