Commit aaee0c1f authored by Kelsey Skunberg's avatar Kelsey Skunberg Committed by Bjorn Helgaas
Browse files

PCI/IOV: Move sysfs SR-IOV functions to iov.c 

The sysfs SR-IOV functions are only needed when the kernel is built with
SR-IOV support.  Rather than put them in pci-sysfs.c under #ifdef
CONFIG_PCI_IOV, move them to iov.c, which is only compiled when
CONFIG_PCI_IOV=y.

Link: https://lore.kernel.org/r/20190813204513.4790-4-skunberg.kelsey@gmail.com


Signed-off-by: default avatarKelsey Skunberg <skunberg.kelsey@gmail.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarDonald Dutile <ddutile@redhat.com>
Reviewed-by: default avatarKuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
parent e2154044

drivers/pci/iov.c

+168 −0
Original line number Diff line number Diff line
@@ -240,6 +240,174 @@ void pci_iov_remove_virtfn(struct pci_dev *dev, int id) 
	pci_dev_put(dev);

}



static ssize_t sriov_totalvfs_show(struct device *dev,

				   struct device_attribute *attr,

				   char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));

}



static ssize_t sriov_numvfs_show(struct device *dev,

				 struct device_attribute *attr,

				 char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->num_VFs);

}



/*

 * num_vfs > 0; number of VFs to enable

 * num_vfs = 0; disable all VFs

 *

 * Note: SRIOV spec does not allow partial VF

 *	 disable, so it's all or none.

 */

static ssize_t sriov_numvfs_store(struct device *dev,

				  struct device_attribute *attr,

				  const char *buf, size_t count)

{

	struct pci_dev *pdev = to_pci_dev(dev);

	int ret;

	u16 num_vfs;



	ret = kstrtou16(buf, 0, &num_vfs);

	if (ret < 0)

		return ret;



	if (num_vfs > pci_sriov_get_totalvfs(pdev))

		return -ERANGE;



	device_lock(&pdev->dev);



	if (num_vfs == pdev->sriov->num_VFs)

		goto exit;



	/* is PF driver loaded w/callback */

	if (!pdev->driver || !pdev->driver->sriov_configure) {

		pci_info(pdev, "Driver does not support SRIOV configuration via sysfs\n");

		ret = -ENOENT;

		goto exit;

	}



	if (num_vfs == 0) {

		/* disable VFs */

		ret = pdev->driver->sriov_configure(pdev, 0);

		goto exit;

	}



	/* enable VFs */

	if (pdev->sriov->num_VFs) {

		pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",

			 pdev->sriov->num_VFs, num_vfs);

		ret = -EBUSY;

		goto exit;

	}



	ret = pdev->driver->sriov_configure(pdev, num_vfs);

	if (ret < 0)

		goto exit;



	if (ret != num_vfs)

		pci_warn(pdev, "%d VFs requested; only %d enabled\n",

			 num_vfs, ret);



exit:

	device_unlock(&pdev->dev);



	if (ret < 0)

		return ret;



	return count;

}



static ssize_t sriov_offset_show(struct device *dev,

				 struct device_attribute *attr,

				 char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->offset);

}



static ssize_t sriov_stride_show(struct device *dev,

				 struct device_attribute *attr,

				 char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->stride);

}



static ssize_t sriov_vf_device_show(struct device *dev,

				    struct device_attribute *attr,

				    char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%x\n", pdev->sriov->vf_device);

}



static ssize_t sriov_drivers_autoprobe_show(struct device *dev,

					    struct device_attribute *attr,

					    char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);

}



static ssize_t sriov_drivers_autoprobe_store(struct device *dev,

					     struct device_attribute *attr,

					     const char *buf, size_t count)

{

	struct pci_dev *pdev = to_pci_dev(dev);

	bool drivers_autoprobe;



	if (kstrtobool(buf, &drivers_autoprobe) < 0)

		return -EINVAL;



	pdev->sriov->drivers_autoprobe = drivers_autoprobe;



	return count;

}



static DEVICE_ATTR_RO(sriov_totalvfs);

static DEVICE_ATTR(sriov_numvfs, 0664, sriov_numvfs_show, sriov_numvfs_store);

static DEVICE_ATTR_RO(sriov_offset);

static DEVICE_ATTR_RO(sriov_stride);

static DEVICE_ATTR_RO(sriov_vf_device);

static DEVICE_ATTR(sriov_drivers_autoprobe, 0664, sriov_drivers_autoprobe_show,

		   sriov_drivers_autoprobe_store);



static struct attribute *sriov_dev_attrs[] = {

	&dev_attr_sriov_totalvfs.attr,

	&dev_attr_sriov_numvfs.attr,

	&dev_attr_sriov_offset.attr,

	&dev_attr_sriov_stride.attr,

	&dev_attr_sriov_vf_device.attr,

	&dev_attr_sriov_drivers_autoprobe.attr,

	NULL,

};



static umode_t sriov_attrs_are_visible(struct kobject *kobj,

				       struct attribute *a, int n)

{

	struct device *dev = kobj_to_dev(kobj);



	if (!dev_is_pf(dev))

		return 0;



	return a->mode;

}



const struct attribute_group sriov_dev_attr_group = {

	.attrs = sriov_dev_attrs,

	.is_visible = sriov_attrs_are_visible,

};



int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)

{

	return 0;

drivers/pci/pci-sysfs.c

+0 −173
Original line number Diff line number Diff line
@@ -548,151 +548,6 @@ static ssize_t devspec_show(struct device *dev, 
static DEVICE_ATTR_RO(devspec);

#endif



#ifdef CONFIG_PCI_IOV

static ssize_t sriov_totalvfs_show(struct device *dev,

				   struct device_attribute *attr,

				   char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));

}





static ssize_t sriov_numvfs_show(struct device *dev,

				 struct device_attribute *attr,

				 char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->num_VFs);

}



/*

 * num_vfs > 0; number of VFs to enable

 * num_vfs = 0; disable all VFs

 *

 * Note: SRIOV spec doesn't allow partial VF

 *       disable, so it's all or none.

 */

static ssize_t sriov_numvfs_store(struct device *dev,

				  struct device_attribute *attr,

				  const char *buf, size_t count)

{

	struct pci_dev *pdev = to_pci_dev(dev);

	int ret;

	u16 num_vfs;



	ret = kstrtou16(buf, 0, &num_vfs);

	if (ret < 0)

		return ret;



	if (num_vfs > pci_sriov_get_totalvfs(pdev))

		return -ERANGE;



	device_lock(&pdev->dev);



	if (num_vfs == pdev->sriov->num_VFs)

		goto exit;



	/* is PF driver loaded w/callback */

	if (!pdev->driver || !pdev->driver->sriov_configure) {

		pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n");

		ret = -ENOENT;

		goto exit;

	}



	if (num_vfs == 0) {

		/* disable VFs */

		ret = pdev->driver->sriov_configure(pdev, 0);

		goto exit;

	}



	/* enable VFs */

	if (pdev->sriov->num_VFs) {

		pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",

			 pdev->sriov->num_VFs, num_vfs);

		ret = -EBUSY;

		goto exit;

	}



	ret = pdev->driver->sriov_configure(pdev, num_vfs);

	if (ret < 0)

		goto exit;



	if (ret != num_vfs)

		pci_warn(pdev, "%d VFs requested; only %d enabled\n",

			 num_vfs, ret);



exit:

	device_unlock(&pdev->dev);



	if (ret < 0)

		return ret;



	return count;

}



static ssize_t sriov_offset_show(struct device *dev,

				 struct device_attribute *attr,

				 char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->offset);

}



static ssize_t sriov_stride_show(struct device *dev,

				 struct device_attribute *attr,

				 char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->stride);

}



static ssize_t sriov_vf_device_show(struct device *dev,

				    struct device_attribute *attr,

				    char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%x\n", pdev->sriov->vf_device);

}



static ssize_t sriov_drivers_autoprobe_show(struct device *dev,

					    struct device_attribute *attr,

					    char *buf)

{

	struct pci_dev *pdev = to_pci_dev(dev);



	return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);

}



static ssize_t sriov_drivers_autoprobe_store(struct device *dev,

					     struct device_attribute *attr,

					     const char *buf, size_t count)

{

	struct pci_dev *pdev = to_pci_dev(dev);

	bool drivers_autoprobe;



	if (kstrtobool(buf, &drivers_autoprobe) < 0)

		return -EINVAL;



	pdev->sriov->drivers_autoprobe = drivers_autoprobe;



	return count;

}



static DEVICE_ATTR_RO(sriov_totalvfs);

static DEVICE_ATTR(sriov_numvfs, 0664, sriov_numvfs_show, sriov_numvfs_store);

static DEVICE_ATTR_RO(sriov_offset);

static DEVICE_ATTR_RO(sriov_stride);

static DEVICE_ATTR_RO(sriov_vf_device);

static DEVICE_ATTR(sriov_drivers_autoprobe, 0664, sriov_drivers_autoprobe_show,

		   sriov_drivers_autoprobe_store);

#endif /* CONFIG_PCI_IOV */



static ssize_t driver_override_store(struct device *dev,

				     struct device_attribute *attr,

				     const char *buf, size_t count)
@@ -1691,34 +1546,6 @@ static const struct attribute_group pci_dev_hp_attr_group = { 
	.is_visible = pci_dev_hp_attrs_are_visible,

};



#ifdef CONFIG_PCI_IOV

static struct attribute *sriov_dev_attrs[] = {

	&dev_attr_sriov_totalvfs.attr,

	&dev_attr_sriov_numvfs.attr,

	&dev_attr_sriov_offset.attr,

	&dev_attr_sriov_stride.attr,

	&dev_attr_sriov_vf_device.attr,

	&dev_attr_sriov_drivers_autoprobe.attr,

	NULL,

};



static umode_t sriov_attrs_are_visible(struct kobject *kobj,

				       struct attribute *a, int n)

{

	struct device *dev = kobj_to_dev(kobj);



	if (!dev_is_pf(dev))

		return 0;



	return a->mode;

}



static const struct attribute_group sriov_dev_attr_group = {

	.attrs = sriov_dev_attrs,

	.is_visible = sriov_attrs_are_visible,

};

#endif /* CONFIG_PCI_IOV */



static const struct attribute_group pci_dev_attr_group = {

	.attrs = pci_dev_dev_attrs,

	.is_visible = pci_dev_attrs_are_visible,

drivers/pci/pci.h

+1 −1
Original line number Diff line number Diff line
@@ -433,7 +433,7 @@ void pci_iov_update_resource(struct pci_dev *dev, int resno); 
resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno);

void pci_restore_iov_state(struct pci_dev *dev);

int pci_iov_bus_range(struct pci_bus *bus);



extern const struct attribute_group sriov_dev_attr_group;

#else

static inline int pci_iov_init(struct pci_dev *dev)

{

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