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/*
* CXL Flash Device Driver
*
* Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
* Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
*
* Copyright (C) 2018 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <misc/ocxl.h>
#include "backend.h"
#include "ocxl_hw.h"
/**
* ocxlflash_destroy_afu() - destroy the AFU structure
* @afu_cookie: AFU to be freed.
*/
static void ocxlflash_destroy_afu(void *afu_cookie)
{
struct ocxl_hw_afu *afu = afu_cookie;
if (!afu)
return;
kfree(afu);
}
/**
* ocxlflash_config_fn() - configure the host function
* @pdev: PCI device associated with the host.
* @afu: AFU associated with the host.
*
* Return: 0 on success, -errno on failure
*/
static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
{
struct ocxl_fn_config *fcfg = &afu->fcfg;
struct device *dev = &pdev->dev;
u16 base, enabled, supported;
int rc = 0;
/* Read DVSEC config of the function */
rc = ocxl_config_read_function(pdev, fcfg);
if (unlikely(rc)) {
dev_err(dev, "%s: ocxl_config_read_function failed rc=%d\n",
__func__, rc);
goto out;
}
/* Check if function has AFUs defined, only 1 per function supported */
if (fcfg->max_afu_index >= 0) {
afu->is_present = true;
if (fcfg->max_afu_index != 0)
dev_warn(dev, "%s: Unexpected AFU index value %d\n",
__func__, fcfg->max_afu_index);
}
rc = ocxl_config_get_actag_info(pdev, &base, &enabled, &supported);
if (unlikely(rc)) {
dev_err(dev, "%s: ocxl_config_get_actag_info failed rc=%d\n",
__func__, rc);
goto out;
}
afu->fn_actag_base = base;
afu->fn_actag_enabled = enabled;
ocxl_config_set_actag(pdev, fcfg->dvsec_function_pos, base, enabled);
dev_dbg(dev, "%s: Function acTag range base=%u enabled=%u\n",
__func__, base, enabled);
out:
return rc;
}
/**
* ocxlflash_config_afu() - configure the host AFU
* @pdev: PCI device associated with the host.
* @afu: AFU associated with the host.
*
* Must be called _after_ host function configuration.
*
* Return: 0 on success, -errno on failure
*/
static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
{
struct ocxl_afu_config *acfg = &afu->acfg;
struct ocxl_fn_config *fcfg = &afu->fcfg;
struct device *dev = &pdev->dev;
int count;
int base;
int pos;
int rc = 0;
/* This HW AFU function does not have any AFUs defined */
if (!afu->is_present)
goto out;
/* Read AFU config at index 0 */
rc = ocxl_config_read_afu(pdev, fcfg, acfg, 0);
if (unlikely(rc)) {
dev_err(dev, "%s: ocxl_config_read_afu failed rc=%d\n",
__func__, rc);
goto out;
}
/* Only one AFU per function is supported, so actag_base is same */
base = afu->fn_actag_base;
count = min_t(int, acfg->actag_supported, afu->fn_actag_enabled);
pos = acfg->dvsec_afu_control_pos;
ocxl_config_set_afu_actag(pdev, pos, base, count);
dev_dbg(dev, "%s: acTag base=%d enabled=%d\n", __func__, base, count);
afu->afu_actag_base = base;
afu->afu_actag_enabled = count;
afu->max_pasid = 1 << acfg->pasid_supported_log;
ocxl_config_set_afu_pasid(pdev, pos, 0, acfg->pasid_supported_log);
out:
return rc;
}
/**
* ocxlflash_create_afu() - create the AFU for OCXL
* @pdev: PCI device associated with the host.
*
* Return: AFU on success, NULL on failure
*/
static void *ocxlflash_create_afu(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
struct ocxl_hw_afu *afu;
int rc;
afu = kzalloc(sizeof(*afu), GFP_KERNEL);
if (unlikely(!afu)) {
dev_err(dev, "%s: HW AFU allocation failed\n", __func__);
goto out;
}
afu->pdev = pdev;
afu->dev = dev;
rc = ocxlflash_config_fn(pdev, afu);
if (unlikely(rc)) {
dev_err(dev, "%s: Function configuration failed rc=%d\n",
__func__, rc);
goto err1;
}
rc = ocxlflash_config_afu(pdev, afu);
if (unlikely(rc)) {
dev_err(dev, "%s: AFU configuration failed rc=%d\n",
__func__, rc);
goto err1;
}
out:
return afu;
err1:
kfree(afu);
afu = NULL;
goto out;
}
/* Backend ops to ocxlflash services */
const struct cxlflash_backend_ops cxlflash_ocxl_ops = {
.module = THIS_MODULE,
.create_afu = ocxlflash_create_afu,
.destroy_afu = ocxlflash_destroy_afu,
};
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