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| author | Kishon Vijay Abraham I <kishon@ti.com> | 2021-02-02 01:28:01 +0530 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-02-23 14:11:31 -0600 |
| commit | 256ae475201b16fd69e00dd6c2d14035e4ea5745 (patch) | |
| tree | 80a3be4e40b155a0100d00cd5f84fc9b361519eb /drivers/pci | |
| parent | 87d5972e476f6c4e98a0abce713c54c6f40661b0 (diff) | |
| download | linux-256ae475201b16fd69e00dd6c2d14035e4ea5745.tar.bz2 | |
PCI: endpoint: Add pci_epf_ops to expose function-specific attrs
In addition to the attributes that are generic across function drivers
documented in Documentation/PCI/endpoint/pci-endpoint-cfs.rst, there could
be function-specific attributes that has to be exposed by the function
driver to be configured by the user. Add ->add_cfs() in pci_epf_ops to be
populated by the function driver if it has to expose any function-specific
attributes and pci_epf_type_add_cfs() to be invoked by pci-ep-cfs.c when
sub-directory to main function directory is created.
Link: https://lore.kernel.org/r/20210201195809.7342-10-kishon@ti.com
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/endpoint/pci-epf-core.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c index 79329ec6373c..7646c8660d42 100644 --- a/drivers/pci/endpoint/pci-epf-core.c +++ b/drivers/pci/endpoint/pci-epf-core.c @@ -21,6 +21,38 @@ static struct bus_type pci_epf_bus_type; static const struct device_type pci_epf_type; /** + * pci_epf_type_add_cfs() - Help function drivers to expose function specific + * attributes in configfs + * @epf: the EPF device that has to be configured using configfs + * @group: the parent configfs group (corresponding to entries in + * pci_epf_device_id) + * + * Invoke to expose function specific attributes in configfs. If the function + * driver does not have anything to expose (attributes configured by user), + * return NULL. + */ +struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf, + struct config_group *group) +{ + struct config_group *epf_type_group; + + if (!epf->driver) { + dev_err(&epf->dev, "epf device not bound to driver\n"); + return NULL; + } + + if (!epf->driver->ops->add_cfs) + return NULL; + + mutex_lock(&epf->lock); + epf_type_group = epf->driver->ops->add_cfs(epf, group); + mutex_unlock(&epf->lock); + + return epf_type_group; +} +EXPORT_SYMBOL_GPL(pci_epf_type_add_cfs); + +/** * pci_epf_unbind() - Notify the function driver that the binding between the * EPF device and EPC device has been lost * @epf: the EPF device which has lost the binding with the EPC device |