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scsi: cxlflash: Hardware AFU for OCXL

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When an adapter is initialized, transport specific configuration and MMIO
mapping details need to be saved. For CXL, this data is managed by the
underlying kernel module. To maintain a separation between the cxlflash core
and underlying transports, introduce a new structure to store data specific to
the OCXL AFU.

Initially only the pointers to underlying PCI and generic devices are added to
this new structure - it will be expanded further in future commits. Services
to create and destroy this hardware AFU are added and integrated in the probe
and exit paths of the driver.

Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Uma Krishnan 2018-03-26 11:31:01 -05:00 committed by Martin K. Petersen
parent 76ebe01fce
commit 48e077dbb4
5 changed files with 73 additions and 2 deletions
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1
drivers/scsi/cxlflash/backend.h
View File

@ -36,6 +36,7 @@ struct cxlflash_backend_ops {
int (*allocate_afu_irqs)(void *ctx_cookie, int num);
void (*free_afu_irqs)(void *ctx_cookie);
void * (*create_afu)(struct pci_dev *dev);
void (*destroy_afu)(void *afu_cookie);
struct file * (*get_fd)(void *ctx_cookie, struct file_operations *fops,
int *fd);
void * (*fops_get_context)(struct file *file);

6
drivers/scsi/cxlflash/cxl_hw.c
View File

@ -110,6 +110,11 @@ static void *cxlflash_create_afu(struct pci_dev *dev)
return cxl_pci_to_afu(dev);
}
static void cxlflash_destroy_afu(void *afu)
{
/* Dummy fop for cxl */
}
static struct file *cxlflash_get_fd(void *ctx_cookie,
struct file_operations *fops, int *fd)
{
@ -160,6 +165,7 @@ const struct cxlflash_backend_ops cxlflash_cxl_ops = {
.allocate_afu_irqs = cxlflash_allocate_afu_irqs,
.free_afu_irqs = cxlflash_free_afu_irqs,
.create_afu = cxlflash_create_afu,
.destroy_afu = cxlflash_destroy_afu,
.get_fd = cxlflash_get_fd,
.fops_get_context = cxlflash_fops_get_context,
.start_work = cxlflash_start_work,

9
drivers/scsi/cxlflash/main.c
View File

@ -971,6 +971,7 @@ static void cxlflash_remove(struct pci_dev *pdev)
case INIT_STATE_AFU:
term_afu(cfg);
case INIT_STATE_PCI:
cfg->ops->destroy_afu(cfg->afu_cookie);
pci_disable_device(pdev);
case INIT_STATE_NONE:
free_mem(cfg);
@ -3689,8 +3690,6 @@ static int cxlflash_probe(struct pci_dev *pdev,
pci_set_drvdata(pdev, cfg);
cfg->afu_cookie = cfg->ops->create_afu(pdev);
rc = init_pci(cfg);
if (rc) {
dev_err(dev, "%s: init_pci failed rc=%d\n", __func__, rc);
@ -3698,6 +3697,12 @@ static int cxlflash_probe(struct pci_dev *pdev,
}
cfg->init_state = INIT_STATE_PCI;
cfg->afu_cookie = cfg->ops->create_afu(pdev);
if (unlikely(!cfg->afu_cookie)) {
dev_err(dev, "%s: create_afu failed\n", __func__);
goto out_remove;
}
rc = init_afu(cfg);
if (rc && !wq_has_sleeper(&cfg->reset_waitq)) {
dev_err(dev, "%s: init_afu failed rc=%d\n", __func__, rc);

40
drivers/scsi/cxlflash/ocxl_hw.c
View File

@ -15,8 +15,48 @@
#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_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;
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;
out:
return afu;
}
/* 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,
};

19
drivers/scsi/cxlflash/ocxl_hw.h Normal file
View File

@ -0,0 +1,19 @@
/*
* 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.
*/
/* OCXL hardware AFU associated with the host */
struct ocxl_hw_afu {
struct pci_dev *pdev; /* PCI device */
struct device *dev; /* Generic device */
};