mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 01:04:08 +08:00
s390/ap: configuration information exploitation
Query AP configuration information. Improve performance of AP bus scans by skipping AP device probing, if the AP deviec is not configured. Reviewed-by: Ingo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com> Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Holger Dengler
Martin Schwidefsky
parent
48a8ca03f8
commit
7501455051
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright IBM Corp. 2006
|
||||
* Copyright IBM Corp. 2006, 2012
|
||||
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
|
||||
* Martin Schwidefsky <schwidefsky@de.ibm.com>
|
||||
* Ralph Wuerthner <rwuerthn@de.ibm.com>
|
||||
@ -62,13 +62,14 @@ static void ap_interrupt_handler(void *unused1, void *unused2);
|
||||
static void ap_reset(struct ap_device *ap_dev);
|
||||
static void ap_config_timeout(unsigned long ptr);
|
||||
static int ap_select_domain(void);
|
||||
static void ap_query_configuration(void);
|
||||
|
||||
/*
|
||||
* Module description.
|
||||
*/
|
||||
MODULE_AUTHOR("IBM Corporation");
|
||||
MODULE_DESCRIPTION("Adjunct Processor Bus driver, "
|
||||
"Copyright IBM Corp. 2006");
|
||||
MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \
|
||||
"Copyright IBM Corp. 2006, 2012");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
/*
|
||||
@ -84,6 +85,7 @@ module_param_named(poll_thread, ap_thread_flag, int, 0000);
|
||||
MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
|
||||
|
||||
static struct device *ap_root_device = NULL;
|
||||
static struct ap_config_info *ap_configuration;
|
||||
static DEFINE_SPINLOCK(ap_device_list_lock);
|
||||
static LIST_HEAD(ap_device_list);
|
||||
|
||||
@ -157,6 +159,17 @@ static int ap_interrupts_available(void)
|
||||
return test_facility(2) && test_facility(65);
|
||||
}
|
||||
|
||||
/**
|
||||
* ap_configuration_available(): Test if AP configuration
|
||||
* information is available.
|
||||
*
|
||||
* Returns 1 if AP configuration information is available.
|
||||
*/
|
||||
static int ap_configuration_available(void)
|
||||
{
|
||||
return test_facility(2) && test_facility(12);
|
||||
}
|
||||
|
||||
/**
|
||||
* ap_test_queue(): Test adjunct processor queue.
|
||||
* @qid: The AP queue number
|
||||
@ -242,6 +255,26 @@ __ap_query_functions(ap_qid_t qid, unsigned int *functions)
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_64BIT
|
||||
static inline int __ap_query_configuration(struct ap_config_info *config)
|
||||
{
|
||||
register unsigned long reg0 asm ("0") = 0x04000000UL;
|
||||
register unsigned long reg1 asm ("1") = -EINVAL;
|
||||
register unsigned char *reg2 asm ("2") = (unsigned char *)config;
|
||||
|
||||
asm volatile(
|
||||
".long 0xb2af0000\n" /* PQAP(QCI) */
|
||||
"0: la %1,0\n"
|
||||
"1:\n"
|
||||
EX_TABLE(0b, 1b)
|
||||
: "+d" (reg0), "+d" (reg1), "+d" (reg2)
|
||||
:
|
||||
: "cc");
|
||||
|
||||
return reg1;
|
||||
}
|
||||
#endif
|
||||
|
||||
/**
|
||||
* ap_query_functions(): Query supported functions.
|
||||
* @qid: The AP queue number
|
||||
@ -305,8 +338,8 @@ int ap_4096_commands_available(ap_qid_t qid)
|
||||
if (ap_query_functions(qid, &functions))
|
||||
return 0;
|
||||
|
||||
return test_ap_facility(functions, 1) &&
|
||||
test_ap_facility(functions, 2);
|
||||
return ap_test_bit(&functions, 1) &&
|
||||
ap_test_bit(&functions, 2);
|
||||
}
|
||||
EXPORT_SYMBOL(ap_4096_commands_available);
|
||||
|
||||
@ -772,6 +805,7 @@ static int ap_bus_resume(struct device *dev)
|
||||
ap_suspend_flag = 0;
|
||||
if (!ap_interrupts_available())
|
||||
ap_interrupt_indicator = NULL;
|
||||
ap_query_configuration();
|
||||
if (!user_set_domain) {
|
||||
ap_domain_index = -1;
|
||||
ap_select_domain();
|
||||
@ -997,6 +1031,65 @@ static struct bus_attribute *const ap_bus_attrs[] = {
|
||||
NULL,
|
||||
};
|
||||
|
||||
static inline int ap_test_config(unsigned int *field, unsigned int nr)
|
||||
{
|
||||
if (nr > 0xFFu)
|
||||
return 0;
|
||||
return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
|
||||
}
|
||||
|
||||
/*
|
||||
* ap_test_config_card_id(): Test, whether an AP card ID is configured.
|
||||
* @id AP card ID
|
||||
*
|
||||
* Returns 0 if the card is not configured
|
||||
* 1 if the card is configured or
|
||||
* if the configuration information is not available
|
||||
*/
|
||||
static inline int ap_test_config_card_id(unsigned int id)
|
||||
{
|
||||
if (!ap_configuration)
|
||||
return 1;
|
||||
return ap_test_config(ap_configuration->apm, id);
|
||||
}
|
||||
|
||||
/*
|
||||
* ap_test_config_domain(): Test, whether an AP usage domain is configured.
|
||||
* @domain AP usage domain ID
|
||||
*
|
||||
* Returns 0 if the usage domain is not configured
|
||||
* 1 if the usage domain is configured or
|
||||
* if the configuration information is not available
|
||||
*/
|
||||
static inline int ap_test_config_domain(unsigned int domain)
|
||||
{
|
||||
if (!ap_configuration)
|
||||
return 1;
|
||||
return ap_test_config(ap_configuration->aqm, domain);
|
||||
}
|
||||
|
||||
/**
|
||||
* ap_query_configuration(): Query AP configuration information.
|
||||
*
|
||||
* Query information of installed cards and configured domains from AP.
|
||||
*/
|
||||
static void ap_query_configuration(void)
|
||||
{
|
||||
#ifdef CONFIG_64BIT
|
||||
if (ap_configuration_available()) {
|
||||
if (!ap_configuration)
|
||||
ap_configuration =
|
||||
kzalloc(sizeof(struct ap_config_info),
|
||||
GFP_KERNEL);
|
||||
if (ap_configuration)
|
||||
__ap_query_configuration(ap_configuration);
|
||||
} else
|
||||
ap_configuration = NULL;
|
||||
#else
|
||||
ap_configuration = NULL;
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* ap_select_domain(): Select an AP domain.
|
||||
*
|
||||
@ -1005,6 +1098,7 @@ static struct bus_attribute *const ap_bus_attrs[] = {
|
||||
static int ap_select_domain(void)
|
||||
{
|
||||
int queue_depth, device_type, count, max_count, best_domain;
|
||||
ap_qid_t qid;
|
||||
int rc, i, j;
|
||||
|
||||
/*
|
||||
@ -1018,9 +1112,13 @@ static int ap_select_domain(void)
|
||||
best_domain = -1;
|
||||
max_count = 0;
|
||||
for (i = 0; i < AP_DOMAINS; i++) {
|
||||
if (!ap_test_config_domain(i))
|
||||
continue;
|
||||
count = 0;
|
||||
for (j = 0; j < AP_DEVICES; j++) {
|
||||
ap_qid_t qid = AP_MKQID(j, i);
|
||||
if (!ap_test_config_card_id(j))
|
||||
continue;
|
||||
qid = AP_MKQID(j, i);
|
||||
rc = ap_query_queue(qid, &queue_depth, &device_type);
|
||||
if (rc)
|
||||
continue;
|
||||
@ -1169,6 +1267,7 @@ static void ap_scan_bus(struct work_struct *unused)
|
||||
unsigned int device_functions;
|
||||
int rc, i;
|
||||
|
||||
ap_query_configuration();
|
||||
if (ap_select_domain() != 0)
|
||||
return;
|
||||
for (i = 0; i < AP_DEVICES; i++) {
|
||||
@ -1176,7 +1275,10 @@ static void ap_scan_bus(struct work_struct *unused)
|
||||
dev = bus_find_device(&ap_bus_type, NULL,
|
||||
(void *)(unsigned long)qid,
|
||||
__ap_scan_bus);
|
||||
rc = ap_query_queue(qid, &queue_depth, &device_type);
|
||||
if (ap_test_config_card_id(i))
|
||||
rc = ap_query_queue(qid, &queue_depth, &device_type);
|
||||
else
|
||||
rc = -ENODEV;
|
||||
if (dev) {
|
||||
if (rc == -EBUSY) {
|
||||
set_current_state(TASK_UNINTERRUPTIBLE);
|
||||
@ -1227,9 +1329,9 @@ static void ap_scan_bus(struct work_struct *unused)
|
||||
kfree(ap_dev);
|
||||
continue;
|
||||
}
|
||||
if (test_ap_facility(device_functions, 3))
|
||||
if (ap_test_bit(&device_functions, 3))
|
||||
ap_dev->device_type = AP_DEVICE_TYPE_CEX3C;
|
||||
else if (test_ap_facility(device_functions, 4))
|
||||
else if (ap_test_bit(&device_functions, 4))
|
||||
ap_dev->device_type = AP_DEVICE_TYPE_CEX3A;
|
||||
else {
|
||||
kfree(ap_dev);
|
||||
@ -1785,6 +1887,7 @@ int __init ap_module_init(void)
|
||||
goto out_root;
|
||||
}
|
||||
|
||||
ap_query_configuration();
|
||||
if (ap_select_domain() == 0)
|
||||
ap_scan_bus(NULL);
|
||||
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
/*
|
||||
* Copyright IBM Corp. 2006
|
||||
* Copyright IBM Corp. 2006, 2012
|
||||
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
|
||||
* Martin Schwidefsky <schwidefsky@de.ibm.com>
|
||||
* Ralph Wuerthner <rwuerthn@de.ibm.com>
|
||||
@ -83,13 +83,12 @@ int ap_queue_status_invalid_test(struct ap_queue_status *status)
|
||||
return !(memcmp(status, &invalid, sizeof(struct ap_queue_status)));
|
||||
}
|
||||
|
||||
#define MAX_AP_FACILITY 31
|
||||
|
||||
static inline int test_ap_facility(unsigned int function, unsigned int nr)
|
||||
#define AP_MAX_BITS 31
|
||||
static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)
|
||||
{
|
||||
if (nr > MAX_AP_FACILITY)
|
||||
if (nr > AP_MAX_BITS)
|
||||
return 0;
|
||||
return function & (unsigned int)(0x80000000 >> nr);
|
||||
return (*ptr & (0x80000000u >> nr)) != 0;
|
||||
}
|
||||
|
||||
#define AP_RESPONSE_NORMAL 0x00
|
||||
@ -183,6 +182,17 @@ struct ap_message {
|
||||
struct ap_message *);
|
||||
};
|
||||
|
||||
struct ap_config_info {
|
||||
unsigned int special_command:1;
|
||||
unsigned int ap_extended:1;
|
||||
unsigned char reserved1:6;
|
||||
unsigned char reserved2[15];
|
||||
unsigned int apm[8]; /* AP ID mask */
|
||||
unsigned int aqm[8]; /* AP queue mask */
|
||||
unsigned int adm[8]; /* AP domain mask */
|
||||
unsigned char reserved4[16];
|
||||
} __packed;
|
||||
|
||||
#define AP_DEVICE(dt) \
|
||||
.dev_type=(dt), \
|
||||
.match_flags=AP_DEVICE_ID_MATCH_DEVICE_TYPE,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user