// SPDX-License-Identifier: GPL-2.0
/*
* Driver for s390 chsc subchannels
*
* Copyright IBM Corp. 2008, 2011
*
* Author(s): Cornelia Huck <[email protected]>
*
*/
#include <linux/slab.h>
#include <linux/compat.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/kernel_stat.h>
#include <asm/cio.h>
#include <asm/chsc.h>
#include <asm/isc.h>
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "chsc_sch.h"
#include "ioasm.h"
static debug_info_t *chsc_debug_msg_id;
static debug_info_t *chsc_debug_log_id;
static struct chsc_request *on_close_request;
static struct chsc_async_area *on_close_chsc_area;
static DEFINE_MUTEX(on_close_mutex);
#define CHSC_MSG(imp, args...) do { \
debug_sprintf_event(chsc_debug_msg_id, imp , ##args); \
} while (0)
#define CHSC_LOG(imp, txt) do { \
debug_text_event(chsc_debug_log_id, imp , txt); \
} while (0)
static void CHSC_LOG_HEX(int level, void *data, int length)
{
debug_event(chsc_debug_log_id, level, data, length);
}
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("driver for s390 chsc subchannels");
MODULE_LICENSE("GPL");
static void chsc_subchannel_irq(struct subchannel *sch)
{
struct chsc_private *private = dev_get_drvdata(&sch->dev);
struct chsc_request *request = private->request;
struct irb *irb = this_cpu_ptr(&cio_irb);
CHSC_LOG(4, "irb");
CHSC_LOG_HEX(4, irb, sizeof(*irb));
inc_irq_stat(IRQIO_CSC);
/* Copy irb to provided request and set done. */
if (!request) {
CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
sch->schid.ssid, sch->schid.sch_no);
return;
}
private->request = NULL;
memcpy(&request->irb, irb, sizeof(*irb));
cio_update_schib(sch);
complete(&request->completion);
put_device(&sch->dev);
}
static int chsc_subchannel_probe(struct subchannel *sch)
{
struct chsc_private *private;
int ret;
CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
sch->schid.ssid, sch->schid.sch_no);
sch->isc = CHSC_SCH_ISC;
private = kzalloc(sizeof(*private), GFP_KERNEL);
if (!private)
return -ENOMEM;
dev_set_drvdata(&sch->dev, private);
ret = cio_enable_subchannel(sch, (u32)virt_to_phys(sch));
if (ret) {
CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
sch->schid.ssid, sch->schid.sch_no, ret);
dev_set_drvdata(&sch->dev, NULL);
kfree(private);
}
return ret;
}
static void chsc_subchannel_remove(struct subchannel *sch)
{
struct chsc_private *private;
cio_disable_subchannel(sch);
private = dev_get_drvdata(&sch->dev);
dev_set_drvdata(&sch->dev, NULL);
if (private->request) {
complete(&private->request->completion);
put_device(&sch->dev);
}
kfree(private);
}
static void chsc_subchannel_shutdown(struct subchannel *sch)
{
cio_disable_subchannel(sch);
}
static struct css_device_id chsc_subchannel_ids[] = {
{ .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
static struct css_driver chsc_subchannel_driver = {
.drv = {
.owner = THIS_MODULE,
.name = "chsc_subchannel",
},
.subchannel_type = chsc_subchannel_ids,
.irq = chsc_subchannel_irq,
.probe = chsc_subchannel_probe,
.remove = chsc_subchannel_remove,
.shutdown = chsc_subchannel_shutdown,
};
static int __init chsc_init_dbfs(void)
{
chsc_debug_msg_id = debug_register("chsc_msg", 8, 1, 4 * sizeof(long));
if (!chsc_debug_msg_id)
goto out;
debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
debug_set_level(chsc_debug_msg_id, 2);
chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
if (!chsc_debug_log_id)
goto out;
debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
debug_set_level(chsc_debug_log_id, 2);
return 0;
out:
debug_unregister(chsc_debug_msg_id);
return -ENOMEM;
}
static void chsc_remove_dbfs(void)
{
debug_unregister(chsc_debug_log_id);
debug_unregister(chsc_debug_msg_id);
}
static int __init chsc_init_sch_driver(void)
{
return css_driver_register(&chsc_subchannel_driver);
}
static void chsc_cleanup_sch_driver(void)
{
css_driver_unregister(&chsc_subchannel_driver);
}
static DEFINE_SPINLOCK(chsc_lock);
static int chsc_subchannel_match_next_free(struct device *dev, const void *data)
{
struct subchannel *sch = to_subchannel(dev);
return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
}
static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
{
struct device *dev;
dev = driver_find_device(&chsc_subchannel_driver.drv,
sch ? &sch->dev : NULL, NULL,
chsc_subchannel_match_next_free);
return dev ? to_subchannel(dev) : NULL;
}
/**
* chsc_async() - try to start a chsc request asynchronously
* @chsc_area: request to be started
* @request: request structure to associate
*
* Tries to start a chsc request on one of the existing chsc subchannels.
* Returns:
* %0 if the request was performed synchronously
* %-EINPROGRESS if the request was successfully started
* %-EBUSY if all chsc subchannels are busy
* %-ENODEV if no chsc subchannels are available
* Context:
* interrupts disabled, chsc_lock held
*/
static int chsc_async(struct chsc_async_area *chsc_area,
struct chsc_request *request)
{
int cc;
struct chsc_private *private;
struct subchannel *sch = NULL;
int ret = -ENODEV;
char dbf[10];
chsc_area->header.key = PAGE_DEFAULT_KEY >> 4;
while ((sch = chsc_get_next_subchannel(sch))) {
spin_lock(&sch->lock);
private = dev_get_drvdata(&sch->dev);
if (private->request) {
spin_unlock(&sch->lock);
ret = -EBUSY;
continue;
}
chsc_area->header.sid = sch->schid;
CHSC_LOG(2, "schid");
CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
cc = chsc(chsc_area);
snprintf(dbf, sizeof(dbf), "cc:%d", cc);
CHSC_LOG(2, dbf);
switch (cc) {
case 0:
ret = 0;
break;
case 1:
sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
ret = -EINPROGRESS;
private->request = request;
break;
case 2:
ret = -EBUSY;
break;
default:
ret = -ENODEV;
}
spin_unlock(&sch->lock);
CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
sch->schid.ssid, sch->schid.sch_no, cc);
if (ret == -EINPROGRESS)
return -EINPROGRESS;
put_device(&sch->dev);
if (ret == 0)
return 0;
}
return ret;
}
static void chsc_log_command(void *chsc_area)
{
char dbf[10];
snprintf(dbf, sizeof(dbf), "CHSC:%x", ((uint16_t *)chsc_area)[1]);
CHSC_LOG(0, dbf);
CHSC_LOG_HEX(0, chsc_area, 32);
}
static int chsc_examine_irb(struct chsc_request *request)
{
int backed_up;
if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
return -EIO;
backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
if (scsw_cstat(&request->irb.scsw) == 0)
return 0;
if (!backed_up)
return 0;
if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
return -EIO;
if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
return -EPERM;
if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
return -EAGAIN;
if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
return -EAGAIN;
return -EIO;
}
static int chsc_ioctl_start(void __user *user_area)
{
struct chsc_request *request;
struct chsc_async_area *chsc_area;
int ret;
char dbf[10];
if (!css_general_characteristics.dynio)
/* It makes no sense to try. */
return -EOPNOTSUPP;
chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!chsc_area)
return -ENOMEM;
request = kzalloc(sizeof(*request), GFP_KERNEL);
if (!request) {
ret = -ENOMEM;
goto out_free;
}
init_completion(&request->completion);
if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
ret = -EFAULT;
goto out_free;
}
chsc_log_command(chsc_area);
spin_lock_irq(&chsc_lock);
ret = chsc_async(chsc_area, request);
spin_unlock_irq(&chsc_lock);
if (ret == -EINPROGRESS) {
wait_for_completion(&request->completion);
ret = chsc_examine_irb(request);
}
/* copy area back to user */
if (!ret)
if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
ret = -EFAULT;
out_free:
snprintf(dbf, sizeof(dbf), "ret:%d", ret);
CHSC_LOG(0, dbf);
kfree(request);
free_page((unsigned long)chsc_area);
return ret;
}
static int chsc_ioctl_on_close_set(void __user *user_area)
{
char dbf[13];
int ret;
mutex_lock(&on_close_mutex);
if (on_close_chsc_area) {
ret = -EBUSY;
goto out_unlock;
}
on_close_request = kzalloc(sizeof(*on_close_request), GFP_KERNEL);
if (!on_close_request) {
ret = -ENOMEM;
goto out_unlock;
}
on_close_chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!on_close_chsc_area) {
ret = -ENOMEM;
goto out_free_request;
}
if (copy_from_user(on_close_chsc_area, user_area, PAGE_SIZE)) {
ret = -EFAULT;
goto out_free_chsc;
}
ret = 0;
goto out_unlock;
out_free_chsc:
free_page((unsigned long)on_close_chsc_area);
on_close_chsc_area = NULL;
out_free_request:
kfree(on_close_request);
on_close_request = NULL;
out_unlock:
mutex_unlock(&on_close_mutex);
snprintf(dbf, sizeof(dbf), "ocsret:%d", ret);
CHSC_LOG(0, dbf);
return ret;
}
static int chsc_ioctl_on_close_remove(void)
{
char dbf[13];
int ret;
mutex_lock(&on_close_mutex);
if (!on_close_chsc_area) {
ret = -ENOENT;
goto out_unlock;
}
free_page((unsigned long)on_close_chsc_area);
on_close_chsc_area = NULL;
kfree(on_close_request);
on_close_request = NULL;
ret = 0;
out_unlock:
mutex_unlock(&on_close_mutex);
snprintf(dbf, sizeof(dbf), "ocrret:%d", ret);
CHSC_LOG(0, dbf);
return ret;
}
static int chsc_ioctl_start_sync(void __user *user_area)
{
struct chsc_sync_area *chsc_area;
int ret, ccode;
chsc_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!chsc_area)
return -ENOMEM;
if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
ret = -EFAULT;
goto out_free;
}
if (chsc_area->header.code & 0x4000) {
ret = -EINVAL;
goto out_free;
}
chsc_log_command(chsc_area);
ccode = chsc(chsc_area);
if (ccode != 0) {
ret = -EIO;
goto out_free;
}
if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
ret = -EFAULT;
else
ret = 0;
out_free:
free_page((unsigned long)chsc_area);
return ret;
}
static int chsc_ioctl_info_channel_path(void __user *user_cd)
{
struct chsc_chp_cd *cd;
int ret, ccode;
struct {
struct chsc_header request;
u32 : 2;
u32 m : 1;
u32 : 1;
u32 fmt1 : 4;
u32 cssid : 8;
u32 : 8;
u32 first_chpid : 8;
u32 : 24;
u32 last_chpid : 8;
u32 : 32;
struct chsc_header response;
u8 data[PAGE_SIZE - 20];
} __attribute__ ((packed)) *scpcd_area;
scpcd_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!scpcd_area)
return -ENOMEM;
cd = kzalloc(sizeof(*cd), GFP_KERNEL);
if (!cd) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(cd, user_cd, sizeof(*cd))) {
ret = -EFAULT;
goto out_free;
}
scpcd_area->request.length = 0x0010;
scpcd_area->request.code = 0x0028;
scpcd_area->m = cd->m;
scpcd_area->fmt1 = cd->fmt;
scpcd_area->cssid = cd->chpid.cssid;
scpcd_area->first_chpid = cd->chpid.id;
scpcd_area->last_chpid = cd->chpid.id;
ccode = chsc(scpcd_area);
if (ccode != 0) {
ret = -EIO;
goto out_free;
}
if (scpcd_area->response.code != 0x0001) {
ret = -EIO;
CHSC_MSG(0, "scpcd: response code=%x\n",
scpcd_area->response.code);
goto out_free;
}
memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
if (copy_to_user(user_cd, cd, sizeof(*cd)))
ret = -EFAULT;
else
ret = 0;
out_free:
kfree(cd);
free_page((unsigned long)scpcd_area);
return ret;
}
static int chsc_ioctl_info_cu(void __user *user_cd)
{
struct chsc_cu_cd *cd;
int ret, ccode;
struct {
struct chsc_header request;
u32 : 2;
u32 m : 1;
u32 : 1;
u32 fmt1 : 4;
u32 cssid : 8;
u32 : 8;
u32 first_cun : 8;
u32 : 24;
u32 last_cun : 8;
u32 : 32;
struct chsc_header response;
u8 data[PAGE_SIZE - 20];
} __attribute__ ((packed)) *scucd_area;
scucd_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!scucd_area)
return -ENOMEM;
cd = kzalloc(sizeof(*cd), GFP_KERNEL);
if (!cd) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(cd, user_cd, sizeof(*cd))) {
ret = -EFAULT;
goto out_free;
}
scucd_area->request.length = 0x0010;
scucd_area->request.code = 0x0026;
scucd_area->m = cd->m;
scucd_area->fmt1 = cd->fmt;
scucd_area->cssid = cd->cssid;
scucd_area->first_cun = cd->cun;
scucd_area->last_cun = cd->cun;
ccode = chsc(scucd_area);
if (ccode != 0) {
ret = -EIO;
goto out_free;
}
if (scucd_area->response.code != 0x0001) {
ret = -EIO;
CHSC_MSG(0, "scucd: response code=%x\n",
scucd_area->response.code);
goto out_free;
}
memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
if (copy_to_user(user_cd, cd, sizeof(*cd)))
ret = -EFAULT;
else
ret = 0;
out_free:
kfree(cd);
free_page((unsigned long)scucd_area);
return ret;
}
static int chsc_ioctl_info_sch_cu(void __user *user_cud)
{
struct chsc_sch_cud *cud;
int ret, ccode;
struct {
struct chsc_header request;
u32 : 2;
u32 m : 1;
u32 : 5;
u32 fmt1 : 4;
u32 : 2;
u32 ssid : 2;
u32 first_sch : 16;
u32 : 8;
u32 cssid : 8;
u32 last_sch : 16;
u32 : 32;
struct chsc_header response;
u8 data[PAGE_SIZE - 20];
} __attribute__ ((packed)) *sscud_area;
sscud_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!sscud_area)
return -ENOMEM;
cud = kzalloc(sizeof(*cud), GFP_KERNEL);
if (!cud) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(cud, user_cud, sizeof(*cud))) {
ret = -EFAULT;
goto out_free;
}
sscud_area->request.length = 0x0010;
sscud_area->request.code = 0x0006;
sscud_area->m = cud->schid.m;
sscud_area->fmt1 = cud->fmt;
sscud_area->ssid = cud->schid.ssid;
sscud_area->first_sch = cud->schid.sch_no;
sscud_area->cssid = cud->schid.cssid;
sscud_area->last_sch = cud->schid.sch_no;
ccode = chsc(sscud_area);
if (ccode != 0) {
ret = -EIO;
goto out_free;
}
if (sscud_area->response.code != 0x0001) {
ret = -EIO;
CHSC_MSG(0, "sscud: response code=%x\n",
sscud_area->response.code);
goto out_free;
}
memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
if (copy_to_user(user_cud, cud, sizeof(*cud)))
ret = -EFAULT;
else
ret = 0;
out_free:
kfree(cud);
free_page((unsigned long)sscud_area);
return ret;
}
static int chsc_ioctl_conf_info(void __user *user_ci)
{
struct chsc_conf_info *ci;
int ret, ccode;
struct {
struct chsc_header request;
u32 : 2;
u32 m : 1;
u32 : 1;
u32 fmt1 : 4;
u32 cssid : 8;
u32 : 6;
u32 ssid : 2;
u32 : 8;
u64 : 64;
struct chsc_header response;
u8 data[PAGE_SIZE - 20];
} __attribute__ ((packed)) *sci_area;
sci_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!sci_area)
return -ENOMEM;
ci = kzalloc(sizeof(*ci), GFP_KERNEL);
if (!ci) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(ci, user_ci, sizeof(*ci))) {
ret = -EFAULT;
goto out_free;
}
sci_area->request.length = 0x0010;
sci_area->request.code = 0x0012;
sci_area->m = ci->id.m;
sci_area->fmt1 = ci->fmt;
sci_area->cssid = ci->id.cssid;
sci_area->ssid = ci->id.ssid;
ccode = chsc(sci_area);
if (ccode != 0) {
ret = -EIO;
goto out_free;
}
if (sci_area->response.code != 0x0001) {
ret = -EIO;
CHSC_MSG(0, "sci: response code=%x\n",
sci_area->response.code);
goto out_free;
}
memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
if (copy_to_user(user_ci, ci, sizeof(*ci)))
ret = -EFAULT;
else
ret = 0;
out_free:
kfree(ci);
free_page((unsigned long)sci_area);
return ret;
}
static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
{
struct chsc_comp_list *ccl;
int ret, ccode;
struct {
struct chsc_header request;
u32 ctype : 8;
u32 : 4;
u32 fmt : 4;
u32 : 16;
u64 : 64;
u32 list_parm[2];
u64 : 64;
struct chsc_header response;
u8 data[PAGE_SIZE - 36];
} __attribute__ ((packed)) *sccl_area;
struct {
u32 m : 1;
u32 : 31;
u32 cssid : 8;
u32 : 16;
u32 chpid : 8;
} __attribute__ ((packed)) *chpid_parm;
struct {
u32 f_cssid : 8;
u32 l_cssid : 8;
u32 : 16;
u32 res;
} __attribute__ ((packed)) *cssids_parm;
sccl_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!sccl_area)
return -ENOMEM;
ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
if (!ccl) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
ret = -EFAULT;
goto out_free;
}
sccl_area->request.length = 0x0020;
sccl_area->request.code = 0x0030;
sccl_area->fmt = ccl->req.fmt;
sccl_area->ctype = ccl->req.ctype;
switch (sccl_area->ctype) {
case CCL_CU_ON_CHP:
case CCL_IOP_CHP:
chpid_parm = (void *)&sccl_area->list_parm;
chpid_parm->m = ccl->req.chpid.m;
chpid_parm->cssid = ccl->req.chpid.chp.cssid;
chpid_parm->chpid = ccl->req.chpid.chp.id;
break;
case CCL_CSS_IMG:
case CCL_CSS_IMG_CONF_CHAR:
cssids_parm = (void *)&sccl_area->list_parm;
cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
break;
}
ccode = chsc(sccl_area);
if (ccode != 0) {
ret = -EIO;
goto out_free;
}
if (sccl_area->response.code != 0x0001) {
ret = -EIO;
CHSC_MSG(0, "sccl: response code=%x\n",
sccl_area->response.code);
goto out_free;
}
memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
ret = -EFAULT;
else
ret = 0;
out_free:
kfree(ccl);
free_page((unsigned long)sccl_area);
return ret;
}
static int chsc_ioctl_chpd(void __user *user_chpd)
{
struct chsc_scpd *scpd_area;
struct chsc_cpd_info *chpd;
int ret;
chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
scpd_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!scpd_area || !chpd) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
ret = -EFAULT;
goto out_free;
}
ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
chpd->rfmt, chpd->c, chpd->m,
scpd_area);
if (ret)
goto out_free;
memcpy(&chpd->chpdb, &scpd_area->response, scpd_area->response.length);
if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
ret = -EFAULT;
out_free:
kfree(chpd);
free_page((unsigned long)scpd_area);
return ret;
}
static int chsc_ioctl_dcal(void __user *user_dcal)
{
struct chsc_dcal *dcal;
int ret, ccode;
struct {
struct chsc_header request;
u32 atype : 8;
u32 : 4;
u32 fmt : 4;
u32 : 16;
u32 res0[2];
u32 list_parm[2];
u32 res1[2];
struct chsc_header response;
u8 data[PAGE_SIZE - 36];
} __attribute__ ((packed)) *sdcal_area;
sdcal_area = (void *)get_zeroed_page(GFP_KERNEL);
if (!sdcal_area)
return -ENOMEM;
dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
if (!dcal) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
ret = -EFAULT;
goto out_free;
}
sdcal_area->request.length = 0x0020;
sdcal_area->request.code = 0x0034;
sdcal_area->atype = dcal->req.atype;
sdcal_area->fmt = dcal->req.fmt;
memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
sizeof(sdcal_area->list_parm));
ccode = chsc(sdcal_area);
if (ccode != 0) {
ret = -EIO;
goto out_free;
}
if (sdcal_area->response.code != 0x0001) {
ret = -EIO;
CHSC_MSG(0, "sdcal: response code=%x\n",
sdcal_area->response.code);
goto out_free;
}
memcpy(&dcal->sdcal, &sdcal_area->response,
sdcal_area->response.length);
if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
ret = -EFAULT;
else
ret = 0;
out_free:
kfree(dcal);
free_page((unsigned long)sdcal_area);
return ret;
}
static long chsc_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
void __user *argp;
CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
if (is_compat_task())
argp = compat_ptr(arg);
else
argp = (void __user *)arg;
switch (cmd) {
case CHSC_START:
return chsc_ioctl_start(argp);
case CHSC_START_SYNC:
return chsc_ioctl_start_sync(argp);
case CHSC_INFO_CHANNEL_PATH:
return chsc_ioctl_info_channel_path(argp);
case CHSC_INFO_CU:
return chsc_ioctl_info_cu(argp);
case CHSC_INFO_SCH_CU:
return chsc_ioctl_info_sch_cu(argp);
case CHSC_INFO_CI:
return chsc_ioctl_conf_info(argp);
case CHSC_INFO_CCL:
return chsc_ioctl_conf_comp_list(argp);
case CHSC_INFO_CPD:
return chsc_ioctl_chpd(argp);
case CHSC_INFO_DCAL:
return chsc_ioctl_dcal(argp);
case CHSC_ON_CLOSE_SET:
return chsc_ioctl_on_close_set(argp);
case CHSC_ON_CLOSE_REMOVE:
return chsc_ioctl_on_close_remove();
default: /* unknown ioctl number */
return -ENOIOCTLCMD;
}
}
static atomic_t chsc_ready_for_use = ATOMIC_INIT(1);
static int chsc_open(struct inode *inode, struct file *file)
{
if (!atomic_dec_and_test(&chsc_ready_for_use)) {
atomic_inc(&chsc_ready_for_use);
return -EBUSY;
}
return nonseekable_open(inode, file);
}
static int chsc_release(struct inode *inode, struct file *filp)
{
char dbf[13];
int ret;
mutex_lock(&on_close_mutex);
if (!on_close_chsc_area)
goto out_unlock;
init_completion(&on_close_request->completion);
CHSC_LOG(0, "on_close");
chsc_log_command(on_close_chsc_area);
spin_lock_irq(&chsc_lock);
ret = chsc_async(on_close_chsc_area, on_close_request);
spin_unlock_irq(&chsc_lock);
if (ret == -EINPROGRESS) {
wait_for_completion(&on_close_request->completion);
ret = chsc_examine_irb(on_close_request);
}
snprintf(dbf, sizeof(dbf), "relret:%d", ret);
CHSC_LOG(0, dbf);
free_page((unsigned long)on_close_chsc_area);
on_close_chsc_area = NULL;
kfree(on_close_request);
on_close_request = NULL;
out_unlock:
mutex_unlock(&on_close_mutex);
atomic_inc(&chsc_ready_for_use);
return 0;
}
static const struct file_operations chsc_fops = {
.owner = THIS_MODULE,
.open = chsc_open,
.release = chsc_release,
.unlocked_ioctl = chsc_ioctl,
.compat_ioctl = chsc_ioctl,
};
static struct miscdevice chsc_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "chsc",
.fops = &chsc_fops,
};
static int __init chsc_misc_init(void)
{
return misc_register(&chsc_misc_device);
}
static void chsc_misc_cleanup(void)
{
misc_deregister(&chsc_misc_device);
}
static int __init chsc_sch_init(void)
{
int ret;
ret = chsc_init_dbfs();
if (ret)
return ret;
isc_register(CHSC_SCH_ISC);
ret = chsc_init_sch_driver();
if (ret)
goto out_dbf;
ret = chsc_misc_init();
if (ret)
goto out_driver;
return ret;
out_driver:
chsc_cleanup_sch_driver();
out_dbf:
isc_unregister(CHSC_SCH_ISC);
chsc_remove_dbfs();
return ret;
}
static void __exit chsc_sch_exit(void)
{
chsc_misc_cleanup();
chsc_cleanup_sch_driver();
isc_unregister(CHSC_SCH_ISC);
chsc_remove_dbfs();
}
module_init(chsc_sch_init);
module_exit(chsc_sch_exit);
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