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// SPDX-License-Identifier: GPL-2.0
/*
* SCLP Event Type (ET) 7 - Diagnostic Test FTP Services, useable on LPAR
*
* Copyright IBM Corp. 2013
* Author(s): Ralf Hoppe (rhoppe@de.ibm.com)
*
*/
#define KMSG_COMPONENT "hmcdrv"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/jiffies.h>
#include <asm/sysinfo.h>
#include <asm/ebcdic.h>
#include "sclp.h"
#include "sclp_diag.h"
#include "sclp_ftp.h"
static DECLARE_COMPLETION(sclp_ftp_rx_complete);
static u8 sclp_ftp_ldflg;
static u64 sclp_ftp_fsize;
static u64 sclp_ftp_length;
/**
* sclp_ftp_txcb() - Diagnostic Test FTP services SCLP command callback
* @req: sclp request
* @data: pointer to struct completion
*/
static void sclp_ftp_txcb(struct sclp_req *req, void *data)
{
struct completion *completion = data;
#ifdef DEBUG
pr_debug("SCLP (ET7) TX-IRQ, SCCB @ 0x%p: %*phN\n",
req->sccb, 24, req->sccb);
#endif
complete(completion);
}
/**
* sclp_ftp_rxcb() - Diagnostic Test FTP services receiver event callback
* @evbuf: pointer to Diagnostic Test (ET7) event buffer
*/
static void sclp_ftp_rxcb(struct evbuf_header *evbuf)
{
struct sclp_diag_evbuf *diag = (struct sclp_diag_evbuf *) evbuf;
/*
* Check for Diagnostic Test FTP Service
*/
if (evbuf->type != EVTYP_DIAG_TEST ||
diag->route != SCLP_DIAG_FTP_ROUTE ||
diag->mdd.ftp.pcx != SCLP_DIAG_FTP_XPCX ||
evbuf->length < SCLP_DIAG_FTP_EVBUF_LEN)
return;
#ifdef DEBUG
pr_debug("SCLP (ET7) RX-IRQ, Event @ 0x%p: %*phN\n",
evbuf, 24, evbuf);
#endif
/*
* Because the event buffer is located in a page which is owned
* by the SCLP core, all data of interest must be copied. The
* error indication is in 'sclp_ftp_ldflg'
*/
sclp_ftp_ldflg = diag->mdd.ftp.ldflg;
sclp_ftp_fsize = diag->mdd.ftp.fsize;
sclp_ftp_length = diag->mdd.ftp.length;
complete(&sclp_ftp_rx_complete);
}
/**
* sclp_ftp_et7() - start a Diagnostic Test FTP Service SCLP request
* @ftp: pointer to FTP descriptor
*
* Return: 0 on success, else a (negative) error code
*/
static int sclp_ftp_et7(const struct hmcdrv_ftp_cmdspec *ftp)
{
struct completion completion;
struct sclp_diag_sccb *sccb;
struct sclp_req *req;
size_t len;
int rc;
req = kzalloc(sizeof(*req), GFP_KERNEL);
sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!req || !sccb) {
rc = -ENOMEM;
goto out_free;
}
sccb->hdr.length = SCLP_DIAG_FTP_EVBUF_LEN +
sizeof(struct sccb_header);
sccb->evbuf.hdr.type = EVTYP_DIAG_TEST;
sccb->evbuf.hdr.length = SCLP_DIAG_FTP_EVBUF_LEN;
sccb->evbuf.hdr.flags = 0; /* clear processed-buffer */
sccb->evbuf.route = SCLP_DIAG_FTP_ROUTE;
sccb->evbuf.mdd.ftp.pcx = SCLP_DIAG_FTP_XPCX;
sccb->evbuf.mdd.ftp.srcflg = 0;
sccb->evbuf.mdd.ftp.pgsize = 0;
sccb->evbuf.mdd.ftp.asce = _ASCE_REAL_SPACE;
sccb->evbuf.mdd.ftp.ldflg = SCLP_DIAG_FTP_LDFAIL;
sccb->evbuf.mdd.ftp.fsize = 0;
sccb->evbuf.mdd.ftp.cmd = ftp->id;
sccb->evbuf.mdd.ftp.offset = ftp->ofs;
sccb->evbuf.mdd.ftp.length = ftp->len;
sccb->evbuf.mdd.ftp.bufaddr = virt_to_phys(ftp->buf);
len = strlcpy(sccb->evbuf.mdd.ftp.fident, ftp->fname,
HMCDRV_FTP_FIDENT_MAX);
if (len >= HMCDRV_FTP_FIDENT_MAX) {
rc = -EINVAL;
goto out_free;
}
req->command = SCLP_CMDW_WRITE_EVENT_DATA;
req->sccb = sccb;
req->status = SCLP_REQ_FILLED;
req->callback = sclp_ftp_txcb;
req->callback_data = &completion;
init_completion(&completion);
rc = sclp_add_request(req);
if (rc)
goto out_free;
/* Wait for end of ftp sclp command. */
wait_for_completion(&completion);
#ifdef DEBUG
pr_debug("status of SCLP (ET7) request is 0x%04x (0x%02x)\n",
sccb->hdr.response_code, sccb->evbuf.hdr.flags);
#endif
/*
* Check if sclp accepted the request. The data transfer runs
* asynchronously and the completion is indicated with an
* sclp ET7 event.
*/
if (req->status != SCLP_REQ_DONE ||
(sccb->evbuf.hdr.flags & 0x80) == 0 || /* processed-buffer */
(sccb->hdr.response_code & 0xffU) != 0x20U) {
rc = -EIO;
}
out_free:
free_page((unsigned long) sccb);
kfree(req);
return rc;
}
/**
* sclp_ftp_cmd() - executes a HMC related SCLP Diagnose (ET7) FTP command
* @ftp: pointer to FTP command specification
* @fsize: return of file size (or NULL if undesirable)
*
* Attention: Notice that this function is not reentrant - so the caller
* must ensure locking.
*
* Return: number of bytes read/written or a (negative) error code
*/
ssize_t sclp_ftp_cmd(const struct hmcdrv_ftp_cmdspec *ftp, size_t *fsize)
{
ssize_t len;
#ifdef DEBUG
unsigned long start_jiffies;
pr_debug("starting SCLP (ET7), cmd %d for '%s' at %lld with %zd bytes\n",
ftp->id, ftp->fname, (long long) ftp->ofs, ftp->len);
start_jiffies = jiffies;
#endif
init_completion(&sclp_ftp_rx_complete);
/* Start ftp sclp command. */
len = sclp_ftp_et7(ftp);
if (len)
goto out_unlock;
/*
* There is no way to cancel the sclp ET7 request, the code
* needs to wait unconditionally until the transfer is complete.
*/
wait_for_completion(&sclp_ftp_rx_complete);
#ifdef DEBUG
pr_debug("completed SCLP (ET7) request after %lu ms (all)\n",
(jiffies - start_jiffies) * 1000 / HZ);
pr_debug("return code of SCLP (ET7) FTP Service is 0x%02x, with %lld/%lld bytes\n",
sclp_ftp_ldflg, sclp_ftp_length, sclp_ftp_fsize);
#endif
switch (sclp_ftp_ldflg) {
case SCLP_DIAG_FTP_OK:
len = sclp_ftp_length;
if (fsize)
*fsize = sclp_ftp_fsize;
break;
case SCLP_DIAG_FTP_LDNPERM:
len = -EPERM;
break;
case SCLP_DIAG_FTP_LDRUNS:
len = -EBUSY;
break;
case SCLP_DIAG_FTP_LDFAIL:
len = -ENOENT;
break;
default:
len = -EIO;
break;
}
out_unlock:
return len;
}
/*
* ET7 event listener
*/
static struct sclp_register sclp_ftp_event = {
.send_mask = EVTYP_DIAG_TEST_MASK, /* want tx events */
.receive_mask = EVTYP_DIAG_TEST_MASK, /* want rx events */
.receiver_fn = sclp_ftp_rxcb, /* async callback (rx) */
.state_change_fn = NULL,
};
/**
* sclp_ftp_startup() - startup of FTP services, when running on LPAR
*/
int sclp_ftp_startup(void)
{
#ifdef DEBUG
unsigned long info;
#endif
int rc;
rc = sclp_register(&sclp_ftp_event);
if (rc)
return rc;
#ifdef DEBUG
info = get_zeroed_page(GFP_KERNEL);
if (info != 0) {
struct sysinfo_2_2_2 *info222 = (struct sysinfo_2_2_2 *)info;
if (!stsi(info222, 2, 2, 2)) { /* get SYSIB 2.2.2 */
info222->name[sizeof(info222->name) - 1] = '\0';
EBCASC_500(info222->name, sizeof(info222->name) - 1);
pr_debug("SCLP (ET7) FTP Service working on LPAR %u (%s)\n",
info222->lpar_number, info222->name);
}
free_page(info);
}
#endif /* DEBUG */
return 0;
}
/**
* sclp_ftp_shutdown() - shutdown of FTP services, when running on LPAR
*/
void sclp_ftp_shutdown(void)
{
sclp_unregister(&sclp_ftp_event);
}
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