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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nutanix.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR02MB4543.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b20617e3-74c6-45bb-017f-08d9448c1134 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Jul 2021 16:51:02.3137 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bb047546-786f-4de1-bd75-24e5b6f79043 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: t3sPu4UMshBUNV+k9DUcK8g641j0mWdDVisquKZoEXoOuVJVjbb2koaAD8OF6kgq71luBHw/Nj1d7C2F+ymC+xnkRU8dXjt0gp3cQtrcLNU= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR02MB7241 X-Proofpoint-ORIG-GUID: -o39XnhOpTBypQStR5uMu34AU6bD2oN9 X-Proofpoint-GUID: -o39XnhOpTBypQStR5uMu34AU6bD2oN9 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-07-11_10:2021-07-09,2021-07-11 signatures=0 X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 05, 2021 at 07:51:34PM +0530, Amey Narkhede wrote: > Add reset_method sysfs attribute to enable user to query and set user > preferred device reset methods and their ordering. >=20 > Co-developed-by: Alex Williamson > Signed-off-by: Alex Williamson > Signed-off-by: Amey Narkhede Just some spacing NITs. Reviewed-by: Raphael Norwitz > --- > Documentation/ABI/testing/sysfs-bus-pci | 19 +++++ > drivers/pci/pci-sysfs.c | 103 ++++++++++++++++++++++++ > 2 files changed, 122 insertions(+) >=20 > diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/= testing/sysfs-bus-pci > index ef00fada2..43f4e33c7 100644 > --- a/Documentation/ABI/testing/sysfs-bus-pci > +++ b/Documentation/ABI/testing/sysfs-bus-pci > @@ -121,6 +121,25 @@ Description: > child buses, and re-discover devices removed earlier > from this part of the device tree. > =20 > +What: /sys/bus/pci/devices/.../reset_method > +Date: March 2021 > +Contact: Amey Narkhede > +Description: > + Some devices allow an individual function to be reset > + without affecting other functions in the same slot. > + > + For devices that have this support, a file named > + reset_method will be present in sysfs. Initially reading > + this file will give names of the device supported reset > + methods and their ordering. After write, this file will > + give names and ordering of currently enabled reset methods. > + Writing the name or comma separated list of names of any of > + the device supported reset methods to this file will set > + the reset methods and their ordering to be used when > + resetting the device. Writing empty string to this file > + will disable ability to reset the device and writing > + "default" will return to the original value. > + > What: /sys/bus/pci/devices/.../reset > Date: July 2009 > Contact: Michael S. Tsirkin > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > index 316f70c3e..8a740e211 100644 > --- a/drivers/pci/pci-sysfs.c > +++ b/drivers/pci/pci-sysfs.c > @@ -1334,6 +1334,108 @@ static const struct attribute_group pci_dev_rom_a= ttr_group =3D { > .is_bin_visible =3D pci_dev_rom_attr_is_visible, > }; > =20 > +static ssize_t reset_method_show(struct device *dev, Nit: spaces on the following two lines. "struct device_attribute *attr" and "char *buf" should be in line with "struct device *dev" > + struct device_attribute *attr, > + char *buf) > +{ > + struct pci_dev *pdev =3D to_pci_dev(dev); > + ssize_t len =3D 0; > + int i, idx; > + > + for (i =3D 0; i < PCI_NUM_RESET_METHODS; i++) { > + idx =3D pdev->reset_methods[i]; > + if (!idx) > + break; > + > + len +=3D sysfs_emit_at(buf, len, "%s%s", len ? "," : "", > + pci_reset_fn_methods[idx].name); > + } > + > + if (len) > + len +=3D sysfs_emit_at(buf, len, "\n"); > + > + return len; > +} > + > +static ssize_t reset_method_store(struct device *dev, Nit: spaces on the following two lines > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct pci_dev *pdev =3D to_pci_dev(dev); > + int n =3D 0; > + char *name, *options =3D NULL; > + u8 reset_methods[PCI_NUM_RESET_METHODS] =3D { 0 }; > + > + if (count >=3D (PAGE_SIZE - 1)) > + return -EINVAL; > + > + if (sysfs_streq(buf, "")) { > + pci_warn(pdev, "All device reset methods disabled by user"); > + goto set_reset_methods; > + } > + > + if (sysfs_streq(buf, "default")) { > + pci_init_reset_methods(pdev); > + return count; > + } > + > + options =3D kstrndup(buf, count, GFP_KERNEL); > + if (!options) > + return -ENOMEM; > + > + while ((name =3D strsep(&options, ",")) !=3D NULL) { > + int i; > + > + if (sysfs_streq(name, "")) > + continue; > + > + name =3D strim(name); > + > + for (i =3D 1; i < PCI_NUM_RESET_METHODS; i++) { > + if (sysfs_streq(name, pci_reset_fn_methods[i].name) && > + !pci_reset_fn_methods[i].reset_fn(pdev, 1)) { > + reset_methods[n++] =3D i; > + break; > + } > + } > + > + if (i =3D=3D PCI_NUM_RESET_METHODS) { > + kfree(options); > + return -EINVAL; > + } > + } > + > + if (!pci_reset_fn_methods[1].reset_fn(pdev, 1) && reset_methods[0] !=3D= 1) > + pci_warn(pdev, "Device specific reset disabled/de-prioritized by user"= ); > + > +set_reset_methods: > + memcpy(pdev->reset_methods, reset_methods, sizeof(reset_methods)); > + kfree(options); > + return count; > +} > +static DEVICE_ATTR_RW(reset_method); > + > +static struct attribute *pci_dev_reset_method_attrs[] =3D { > + &dev_attr_reset_method.attr, > + NULL, > +}; > + > +static umode_t pci_dev_reset_method_attr_is_visible(struct kobject *kobj= , Nit: ditto - spacing. > + struct attribute *a, int n) > +{ > + struct pci_dev *pdev =3D to_pci_dev(kobj_to_dev(kobj)); > + > + if (!pci_reset_supported(pdev)) > + return 0; > + > + return a->mode; > +} > + > +static const struct attribute_group pci_dev_reset_method_attr_group =3D = { > + .attrs =3D pci_dev_reset_method_attrs, > + .is_visible =3D pci_dev_reset_method_attr_is_visible, > +}; > + > static ssize_t reset_store(struct device *dev, struct device_attribute *= attr, Nit: spacing following line. > const char *buf, size_t count) > { > @@ -1491,6 +1593,7 @@ const struct attribute_group *pci_dev_groups[] =3D = { > &pci_dev_config_attr_group, > &pci_dev_rom_attr_group, > &pci_dev_reset_attr_group, > + &pci_dev_reset_method_attr_group, > &pci_dev_vpd_attr_group, > #ifdef CONFIG_DMI > &pci_dev_smbios_attr_group, > --=20 > 2.32.0 >=20 > =