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Message-ID: <59c7fc35-656e-e388-6ca5-e4e7ac2b01b3@linux.intel.com>
Date: Thu, 15 Aug 2019 10:34:43 -0700
From: sathyanarayanan kuppuswamy
<sathyanarayanan.kuppuswamy@...ux.intel.com>
To: Kelsey Skunberg <skunberg.kelsey@...il.com>, bhelgaas@...gle.com,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: skhan@...uxfoundation.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
bodong@...lanox.com, ddutile@...hat.com, gregkh@...uxfoundation.org
Subject: Re: [PATCH v3 4/4] PCI/IOV: Move sysfs SR-IOV functions to iov.c
On 8/15/19 8:33 AM, Kelsey Skunberg wrote:
> The sysfs SR-IOV functions are for an optional feature and will be better
> organized to keep with the feature's code. Move the sysfs SR-IOV functions
> to /pci/iov.c.
>
> Signed-off-by: Kelsey Skunberg <skunberg.kelsey@...il.com>
Looks good to me.
Reviewed-by: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com>
> ---
> drivers/pci/iov.c | 168 ++++++++++++++++++++++++++++++++++++++
> drivers/pci/pci-sysfs.c | 173 ----------------------------------------
> drivers/pci/pci.h | 2 +-
> 3 files changed, 169 insertions(+), 174 deletions(-)
>
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index 9b48818ced01..b335db21c85e 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -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;
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 5bb301efec98..868e35109284 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -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,
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 61bbfd611140..7e3c6c8ae6f9 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -455,7 +455,7 @@ 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)
> {
--
Sathyanarayanan Kuppuswamy
Linux kernel developer
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