linux/drivers/s390/char/sclp_pci.c
Jan Höppner 6779df406b s390/sclp: Allow to request adapter reset
The SCLP event 24 "Adapter Error Notification" supports three different
action qualifier of which 'adapter reset' is currently not enabled in
the sysfs interface. However, userspace tools might want to be able
to use the reset functionality as well. Enable the 'adapter reset'
qualifier.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-09-20 13:20:27 +02:00

201 lines
4.2 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* PCI I/O adapter configuration related functions.
*
* Copyright IBM Corp. 2016
*/
#define KMSG_COMPONENT "sclp_cmd"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/completion.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <asm/sclp.h>
#include "sclp.h"
#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
#define SCLP_ATYPE_PCI 2
#define SCLP_ERRNOTIFY_AQ_RESET 0
#define SCLP_ERRNOTIFY_AQ_REPAIR 1
#define SCLP_ERRNOTIFY_AQ_INFO_LOG 2
static DEFINE_MUTEX(sclp_pci_mutex);
static struct sclp_register sclp_pci_event = {
.send_mask = EVTYP_ERRNOTIFY_MASK,
};
struct err_notify_evbuf {
struct evbuf_header header;
u8 action;
u8 atype;
u32 fh;
u32 fid;
u8 data[0];
} __packed;
struct err_notify_sccb {
struct sccb_header header;
struct err_notify_evbuf evbuf;
} __packed;
struct pci_cfg_sccb {
struct sccb_header header;
u8 atype; /* adapter type */
u8 reserved1;
u16 reserved2;
u32 aid; /* adapter identifier */
} __packed;
static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
{
struct pci_cfg_sccb *sccb;
int rc;
if (!SCLP_HAS_PCI_RECONFIG)
return -EOPNOTSUPP;
sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!sccb)
return -ENOMEM;
sccb->header.length = PAGE_SIZE;
sccb->atype = SCLP_ATYPE_PCI;
sccb->aid = fid;
rc = sclp_sync_request(cmd, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {
case 0x0020:
case 0x0120:
break;
default:
pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
cmd, sccb->header.response_code);
rc = -EIO;
break;
}
out:
free_page((unsigned long) sccb);
return rc;
}
int sclp_pci_configure(u32 fid)
{
return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
}
EXPORT_SYMBOL(sclp_pci_configure);
int sclp_pci_deconfigure(u32 fid)
{
return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
}
EXPORT_SYMBOL(sclp_pci_deconfigure);
static void sclp_pci_callback(struct sclp_req *req, void *data)
{
struct completion *completion = data;
complete(completion);
}
static int sclp_pci_check_report(struct zpci_report_error_header *report)
{
if (report->version != 1)
return -EINVAL;
switch (report->action) {
case SCLP_ERRNOTIFY_AQ_RESET:
case SCLP_ERRNOTIFY_AQ_REPAIR:
case SCLP_ERRNOTIFY_AQ_INFO_LOG:
break;
default:
return -EINVAL;
}
if (report->length > (PAGE_SIZE - sizeof(struct err_notify_sccb)))
return -EINVAL;
return 0;
}
int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid)
{
DECLARE_COMPLETION_ONSTACK(completion);
struct err_notify_sccb *sccb;
struct sclp_req req;
int ret;
ret = sclp_pci_check_report(report);
if (ret)
return ret;
mutex_lock(&sclp_pci_mutex);
ret = sclp_register(&sclp_pci_event);
if (ret)
goto out_unlock;
if (!(sclp_pci_event.sclp_receive_mask & EVTYP_ERRNOTIFY_MASK)) {
ret = -EOPNOTSUPP;
goto out_unregister;
}
sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!sccb) {
ret = -ENOMEM;
goto out_unregister;
}
memset(&req, 0, sizeof(req));
req.callback_data = &completion;
req.callback = sclp_pci_callback;
req.command = SCLP_CMDW_WRITE_EVENT_DATA;
req.status = SCLP_REQ_FILLED;
req.sccb = sccb;
sccb->evbuf.header.length = sizeof(sccb->evbuf) + report->length;
sccb->evbuf.header.type = EVTYP_ERRNOTIFY;
sccb->header.length = sizeof(sccb->header) + sccb->evbuf.header.length;
sccb->evbuf.action = report->action;
sccb->evbuf.atype = SCLP_ATYPE_PCI;
sccb->evbuf.fh = fh;
sccb->evbuf.fid = fid;
memcpy(sccb->evbuf.data, report->data, report->length);
ret = sclp_add_request(&req);
if (ret)
goto out_free_req;
wait_for_completion(&completion);
if (req.status != SCLP_REQ_DONE) {
pr_warn("request failed (status=0x%02x)\n",
req.status);
ret = -EIO;
goto out_free_req;
}
if (sccb->header.response_code != 0x0020) {
pr_warn("request failed with response code 0x%x\n",
sccb->header.response_code);
ret = -EIO;
}
out_free_req:
free_page((unsigned long) sccb);
out_unregister:
sclp_unregister(&sclp_pci_event);
out_unlock:
mutex_unlock(&sclp_pci_mutex);
return ret;
}