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s390/zcrypt: remove duplicate low level functions 

ap_test_queue, ap_query_facilities, __ap_query_functions all use
the same PQAP(TAPQ) command. Consolidate the three into a single
ap_test_queue function that returns the AP status and the 64-bit
result. The exception table entry for PQAP(TAPQ) can be avoided
if the T bit for the APFT facility is set only if test_facility(15)
indicated that the facility is present.

Integrate ap_query_function into ap_query queue to avoid calling
PQAP(TAPQ) twice.

Reviewed-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2015-06-26 15:40:41 +02:00
parent 29b0a8250b
commit 6acbe21f47
2 changed files with 32 additions and 117 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

140
drivers/s390/crypto/ap_bus.c
View File

@ -182,43 +182,26 @@ static int ap_configuration_available(void)
/**
* ap_test_queue(): Test adjunct processor queue.
* @qid: The AP queue number
* @queue_depth: Pointer to queue depth value
* @device_type: Pointer to device type value
* @info: Pointer to queue descriptor
*
* Returns AP queue status structure.
*/
static inline struct ap_queue_status
ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type)
ap_test_queue(ap_qid_t qid, unsigned long *info)
{
register unsigned long reg0 asm ("0") = qid;
register struct ap_queue_status reg1 asm ("1");
register unsigned long reg2 asm ("2") = 0UL;
if (test_facility(15))
reg0 |= 1UL << 23; /* set APFT T bit*/
asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
: "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
*device_type = (int) (reg2 >> 24);
*queue_depth = (int) (reg2 & 0xff);
if (info)
*info = reg2;
return reg1;
}
/**
* ap_query_facilities(): PQAP(TAPQ) query facilities.
* @qid: The AP queue number
*
* Returns content of general register 2 after the PQAP(TAPQ)
* instruction was called.
*/
static inline unsigned long ap_query_facilities(ap_qid_t qid)
{
register unsigned long reg0 asm ("0") = qid | 0x00800000UL;
register unsigned long reg1 asm ("1");
register unsigned long reg2 asm ("2") = 0UL;
asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
: "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
return reg2;
}
/**
* ap_reset_queue(): Reset adjunct processor queue.
* @qid: The AP queue number
@ -259,25 +242,6 @@ ap_queue_interruption_control(ap_qid_t qid, void *ind)
return reg1_out;
}
static inline struct ap_queue_status
__ap_query_functions(ap_qid_t qid, unsigned int *functions)
{
register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23);
register struct ap_queue_status reg1 asm ("1") = AP_QUEUE_STATUS_INVALID;
register unsigned long reg2 asm ("2");
asm volatile(
".long 0xb2af0000\n" /* PQAP(TAPQ) */
"0:\n"
EX_TABLE(0b, 0b)
: "+d" (reg0), "+d" (reg1), "=d" (reg2)
:
: "cc");
*functions = (unsigned int)(reg2 >> 32);
return reg1;
}
static inline int __ap_query_configuration(struct ap_config_info *config)
{
register unsigned long reg0 asm ("0") = 0x04000000UL;
@ -296,42 +260,6 @@ static inline int __ap_query_configuration(struct ap_config_info *config)
return reg1;
}
/**
* ap_query_functions(): Query supported functions.
* @qid: The AP queue number
* @functions: Pointer to functions field.
*
* Returns
* 0 on success.
* -ENODEV if queue not valid.
* -EBUSY if device busy.
* -EINVAL if query function is not supported
*/
static int ap_query_functions(ap_qid_t qid, unsigned int *functions)
{
struct ap_queue_status status;
status = __ap_query_functions(qid, functions);
if (ap_queue_status_invalid_test(&status))
return -ENODEV;
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
return 0;
case AP_RESPONSE_Q_NOT_AVAIL:
case AP_RESPONSE_DECONFIGURED:
case AP_RESPONSE_CHECKSTOPPED:
case AP_RESPONSE_INVALID_ADDRESS:
return -ENODEV;
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_BUSY:
case AP_RESPONSE_OTHERWISE_CHANGED:
default:
return -EBUSY;
}
}
/**
* ap_queue_enable_interruption(): Enable interruption on an AP.
* @qid: The AP queue number
@ -515,17 +443,20 @@ static inline void ap_schedule_poll_timer(void)
* @qid: The AP queue number
* @queue_depth: Pointer to queue depth value
* @device_type: Pointer to device type value
* @facilities: Pointer to facility indicator
*/
static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type)
static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type,
unsigned int *facilities)
{
struct ap_queue_status status;
int t_depth, t_device_type;
unsigned long info;
status = ap_test_queue(qid, &t_depth, &t_device_type);
status = ap_test_queue(qid, &info);
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
*queue_depth = t_depth + 1;
*device_type = t_device_type;
*queue_depth = (int)(info & 0xff);
*device_type = (int)((info >> 24) & 0xff);
*facilities = (unsigned int)(info >> 32);
return 0;
case AP_RESPONSE_Q_NOT_AVAIL:
case AP_RESPONSE_DECONFIGURED:
@ -1184,6 +1115,7 @@ static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);
static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
{
struct ap_queue_status status;
ap_qid_t qid;
int i, nd, max_domain_id = -1;
unsigned long fbits;
@ -1194,7 +1126,9 @@ static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
if (!ap_test_config_card_id(i))
continue;
qid = AP_MKQID(i, ap_domain_index);
fbits = ap_query_facilities(qid);
status = ap_test_queue(qid, &fbits);
if (status.response_code != AP_RESPONSE_NORMAL)
continue;
if (fbits & (1UL << 57)) {
/* the N bit is 0, Nd field is filled */
nd = (int)((fbits & 0x00FF0000UL)>>16);
@ -1254,9 +1188,9 @@ static void ap_query_configuration(void)
*/
static int ap_select_domain(void)
{
int queue_depth, device_type, count, max_count, best_domain;
ap_qid_t qid;
int rc, i, j;
int count, max_count, best_domain;
struct ap_queue_status status;
int i, j;
/* IF APXA isn't installed, only 16 domains could be defined */
if (!ap_configuration->ap_extended && (ap_domain_index > 15))
@ -1279,9 +1213,8 @@ static int ap_select_domain(void)
for (j = 0; j < AP_DEVICES; j++) {
if (!ap_test_config_card_id(j))
continue;
qid = AP_MKQID(j, i);
rc = ap_query_queue(qid, &queue_depth, &device_type);
if (rc)
status = ap_test_queue(AP_MKQID(j, i), NULL);
if (status.response_code != AP_RESPONSE_NORMAL)
continue;
count++;
}
@ -1438,7 +1371,8 @@ static void ap_scan_bus(struct work_struct *unused)
(void *)(unsigned long)qid,
__ap_scan_bus);
if (ap_test_config_card_id(i))
rc = ap_query_queue(qid, &queue_depth, &device_type);
rc = ap_query_queue(qid, &queue_depth, &device_type,
&device_functions);
else
rc = -ENODEV;
if (dev) {
@ -1468,6 +1402,9 @@ static void ap_scan_bus(struct work_struct *unused)
continue;
}
ap_dev->queue_depth = queue_depth;
ap_dev->raw_hwtype = device_type;
ap_dev->device_type = device_type;
ap_dev->functions = device_functions;
ap_dev->unregistered = 1;
spin_lock_init(&ap_dev->lock);
INIT_LIST_HEAD(&ap_dev->pendingq);
@ -1475,24 +1412,12 @@ static void ap_scan_bus(struct work_struct *unused)
INIT_LIST_HEAD(&ap_dev->list);
setup_timer(&ap_dev->timeout, ap_request_timeout,
(unsigned long) ap_dev);
switch (device_type) {
case 0:
if (ap_dev->device_type == 0)
/* device type probing for old cards */
if (ap_probe_device_type(ap_dev)) {
kfree(ap_dev);
continue;
}
break;
default:
ap_dev->device_type = device_type;
}
ap_dev->raw_hwtype = device_type;
rc = ap_query_functions(qid, &device_functions);
if (!rc)
ap_dev->functions = device_functions;
else
ap_dev->functions = 0u;
ap_dev->device.bus = &ap_bus_type;
ap_dev->device.parent = ap_root_device;
@ -1640,12 +1565,11 @@ static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags)
*/
static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags)
{
int rc, depth, type;
struct ap_queue_status status;
int rc;
if (ap_dev->reset == AP_RESET_IN_PROGRESS) {
status = ap_test_queue(ap_dev->qid, &depth, &type);
status = ap_test_queue(ap_dev->qid, NULL);
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
ap_dev->reset = AP_RESET_IGNORE;
@ -1676,7 +1600,7 @@ static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags)
if ((ap_dev->reset != AP_RESET_IN_PROGRESS) &&
(ap_dev->interrupt == AP_INTR_IN_PROGRESS)) {
status = ap_test_queue(ap_dev->qid, &depth, &type);
status = ap_test_queue(ap_dev->qid, NULL);
if (ap_using_interrupts()) {
if (status.int_enabled == 1)
ap_dev->interrupt = AP_INTR_ENABLED;

9
drivers/s390/crypto/ap_bus.h
View File

@ -75,15 +75,6 @@ struct ap_queue_status {
unsigned int pad2 : 16;
} __packed;
#define AP_QUEUE_STATUS_INVALID \
{ 1, 1, 1, 0xF, 1, 0xFF, 0xFFFF }
static inline
int ap_queue_status_invalid_test(struct ap_queue_status *status)
{
struct ap_queue_status invalid = AP_QUEUE_STATUS_INVALID;
return !(memcmp(status, &invalid, sizeof(struct ap_queue_status)));
}
#define AP_MAX_BITS 31
static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)