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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2023 Advanced Micro Devices, Inc */
#include <linux/pci.h>
#include "core.h"
#include <linux/pds/pds_auxbus.h>
/**
* pds_client_register - Link the client to the firmware
* @pf: ptr to the PF driver's private data struct
* @devname: name that includes service into, e.g. pds_core.vDPA
*
* Return: positive client ID (ci) on success, or
* negative for error
*/
int pds_client_register(struct pdsc *pf, char *devname)
{
union pds_core_adminq_comp comp = {};
union pds_core_adminq_cmd cmd = {};
int err;
u16 ci;
cmd.client_reg.opcode = PDS_AQ_CMD_CLIENT_REG;
strscpy(cmd.client_reg.devname, devname,
sizeof(cmd.client_reg.devname));
err = pdsc_adminq_post(pf, &cmd, &comp, false);
if (err) {
dev_info(pf->dev, "register dev_name %s with DSC failed, status %d: %pe\n",
devname, comp.status, ERR_PTR(err));
return err;
}
ci = le16_to_cpu(comp.client_reg.client_id);
if (!ci) {
dev_err(pf->dev, "%s: device returned null client_id\n",
__func__);
return -EIO;
}
dev_dbg(pf->dev, "%s: device returned client_id %d for %s\n",
__func__, ci, devname);
return ci;
}
EXPORT_SYMBOL_GPL(pds_client_register);
/**
* pds_client_unregister - Unlink the client from the firmware
* @pf: ptr to the PF driver's private data struct
* @client_id: id returned from pds_client_register()
*
* Return: 0 on success, or
* negative for error
*/
int pds_client_unregister(struct pdsc *pf, u16 client_id)
{
union pds_core_adminq_comp comp = {};
union pds_core_adminq_cmd cmd = {};
int err;
cmd.client_unreg.opcode = PDS_AQ_CMD_CLIENT_UNREG;
cmd.client_unreg.client_id = cpu_to_le16(client_id);
err = pdsc_adminq_post(pf, &cmd, &comp, false);
if (err)
dev_info(pf->dev, "unregister client_id %d failed, status %d: %pe\n",
client_id, comp.status, ERR_PTR(err));
return err;
}
EXPORT_SYMBOL_GPL(pds_client_unregister);
/**
* pds_client_adminq_cmd - Process an adminq request for the client
* @padev: ptr to the client device
* @req: ptr to buffer with request
* @req_len: length of actual struct used for request
* @resp: ptr to buffer where answer is to be copied
* @flags: optional flags from pds_core_adminq_flags
*
* Return: 0 on success, or
* negative for error
*
* Client sends pointers to request and response buffers
* Core copies request data into pds_core_client_request_cmd
* Core sets other fields as needed
* Core posts to AdminQ
* Core copies completion data into response buffer
*/
int pds_client_adminq_cmd(struct pds_auxiliary_dev *padev,
union pds_core_adminq_cmd *req,
size_t req_len,
union pds_core_adminq_comp *resp,
u64 flags)
{
union pds_core_adminq_cmd cmd = {};
struct pci_dev *pf_pdev;
struct pdsc *pf;
size_t cp_len;
int err;
pf_pdev = pci_physfn(padev->vf_pdev);
pf = pci_get_drvdata(pf_pdev);
dev_dbg(pf->dev, "%s: %s opcode %d\n",
__func__, dev_name(&padev->aux_dev.dev), req->opcode);
if (pf->state)
return -ENXIO;
/* Wrap the client's request */
cmd.client_request.opcode = PDS_AQ_CMD_CLIENT_CMD;
cmd.client_request.client_id = cpu_to_le16(padev->client_id);
cp_len = min_t(size_t, req_len, sizeof(cmd.client_request.client_cmd));
memcpy(cmd.client_request.client_cmd, req, cp_len);
err = pdsc_adminq_post(pf, &cmd, resp,
!!(flags & PDS_AQ_FLAG_FASTPOLL));
if (err && err != -EAGAIN)
dev_info(pf->dev, "client admin cmd failed: %pe\n",
ERR_PTR(err));
return err;
}
EXPORT_SYMBOL_GPL(pds_client_adminq_cmd);
static void pdsc_auxbus_dev_release(struct device *dev)
{
struct pds_auxiliary_dev *padev =
container_of(dev, struct pds_auxiliary_dev, aux_dev.dev);
kfree(padev);
}
static struct pds_auxiliary_dev *pdsc_auxbus_dev_register(struct pdsc *cf,
struct pdsc *pf,
u16 client_id,
char *name)
{
struct auxiliary_device *aux_dev;
struct pds_auxiliary_dev *padev;
int err;
padev = kzalloc(sizeof(*padev), GFP_KERNEL);
if (!padev)
return ERR_PTR(-ENOMEM);
padev->vf_pdev = cf->pdev;
padev->client_id = client_id;
aux_dev = &padev->aux_dev;
aux_dev->name = name;
aux_dev->id = cf->uid;
aux_dev->dev.parent = cf->dev;
aux_dev->dev.release = pdsc_auxbus_dev_release;
err = auxiliary_device_init(aux_dev);
if (err < 0) {
dev_warn(cf->dev, "auxiliary_device_init of %s failed: %pe\n",
name, ERR_PTR(err));
goto err_out;
}
err = auxiliary_device_add(aux_dev);
if (err) {
dev_warn(cf->dev, "auxiliary_device_add of %s failed: %pe\n",
name, ERR_PTR(err));
goto err_out_uninit;
}
return padev;
err_out_uninit:
auxiliary_device_uninit(aux_dev);
err_out:
kfree(padev);
return ERR_PTR(err);
}
int pdsc_auxbus_dev_del(struct pdsc *cf, struct pdsc *pf)
{
struct pds_auxiliary_dev *padev;
int err = 0;
mutex_lock(&pf->config_lock);
padev = pf->vfs[cf->vf_id].padev;
if (padev) {
pds_client_unregister(pf, padev->client_id);
auxiliary_device_delete(&padev->aux_dev);
auxiliary_device_uninit(&padev->aux_dev);
padev->client_id = 0;
}
pf->vfs[cf->vf_id].padev = NULL;
mutex_unlock(&pf->config_lock);
return err;
}
int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf)
{
struct pds_auxiliary_dev *padev;
enum pds_core_vif_types vt;
char devname[PDS_DEVNAME_LEN];
u16 vt_support;
int client_id;
int err = 0;
mutex_lock(&pf->config_lock);
/* We only support vDPA so far, so it is the only one to
* be verified that it is available in the Core device and
* enabled in the devlink param. In the future this might
* become a loop for several VIF types.
*/
/* Verify that the type is supported and enabled. It is not
* an error if there is no auxbus device support for this
* VF, it just means something else needs to happen with it.
*/
vt = PDS_DEV_TYPE_VDPA;
vt_support = !!le16_to_cpu(pf->dev_ident.vif_types[vt]);
if (!(vt_support &&
pf->viftype_status[vt].supported &&
pf->viftype_status[vt].enabled))
goto out_unlock;
/* Need to register with FW and get the client_id before
* creating the aux device so that the aux client can run
* adminq commands as part its probe
*/
snprintf(devname, sizeof(devname), "%s.%s.%d",
PDS_CORE_DRV_NAME, pf->viftype_status[vt].name, cf->uid);
client_id = pds_client_register(pf, devname);
if (client_id < 0) {
err = client_id;
goto out_unlock;
}
padev = pdsc_auxbus_dev_register(cf, pf, client_id,
pf->viftype_status[vt].name);
if (IS_ERR(padev)) {
pds_client_unregister(pf, client_id);
err = PTR_ERR(padev);
goto out_unlock;
}
pf->vfs[cf->vf_id].padev = padev;
out_unlock:
mutex_unlock(&pf->config_lock);
return err;
}
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