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[PATCH] s390: qdio V=V pass-through

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New feature V=V qdio pass-through.

QDIO and HiperSockets processing in z/VM V=V guest environments (as well as
V=R with z/VM running in LPAR mode) requires shadowing of all QDIO
architecture queue elements.  Especially the shadowing of SBALs and SLSBs
structures in the hypervisor, and the need to issue SIGA SYNC operations to
observe state changes, eventually causes significant CPU processing overhead
in the hypervisor.

The QDIO pass-through support for V=V guests avoids the shadowing of SBALs and
SLSBs.  This significantly reduces the hypervisor overhead for QDIO based I/O.

Signed-off-by: Frank Pavlic <pavlic@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Frank Pavlic 2006-01-06 00:19:20 -08:00 committed by Linus Torvalds
parent 05f29fcdb0
commit 8129ee1642
5 changed files with 560 additions and 160 deletions
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7
arch/s390/Kconfig
View File

@ -240,8 +240,8 @@ config MACHCHK_WARNING
config QDIO
tristate "QDIO support"
---help---
This driver provides the Queued Direct I/O base support for the
IBM S/390 (G5 and G6) and eServer zSeries (z800, z890, z900 and z990).
This driver provides the Queued Direct I/O base support for
IBM mainframes.
For details please refer to the documentation provided by IBM at
<http://www10.software.ibm.com/developerworks/opensource/linux390>
@ -263,7 +263,8 @@ config QDIO_DEBUG
bool "Extended debugging information"
depends on QDIO
help
Say Y here to get extended debugging output in /proc/s390dbf/qdio...
Say Y here to get extended debugging output in
/sys/kernel/debug/s390dbf/qdio...
Warning: this option reduces the performance of the QDIO module.
If unsure, say N.

4
drivers/s390/cio/chsc.h
View File

@ -43,7 +43,9 @@ struct css_general_char {
u32 ext_mb : 1; /* bit 48 */
u32 : 7;
u32 aif_tdd : 1; /* bit 56 */
u32 : 10;
u32 : 1;
u32 qebsm : 1; /* bit 58 */
u32 : 8;
u32 aif_osa : 1; /* bit 67 */
u32 : 28;
}__attribute__((packed));

499
drivers/s390/cio/qdio.c
View File

@ -56,7 +56,7 @@
#include "ioasm.h"
#include "chsc.h"
#define VERSION_QDIO_C "$Revision: 1.108 $"
#define VERSION_QDIO_C "$Revision: 1.113 $"
/****************** MODULE PARAMETER VARIABLES ********************/
MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>");
@ -76,6 +76,7 @@ static struct qdio_perf_stats perf_stats;
#endif /* QDIO_PERFORMANCE_STATS */
static int hydra_thinints;
static int is_passthrough = 0;
static int omit_svs;
static int indicator_used[INDICATORS_PER_CACHELINE];
@ -136,12 +137,126 @@ qdio_release_q(struct qdio_q *q)
atomic_dec(&q->use_count);
}
static volatile inline void
qdio_set_slsb(volatile char *slsb, unsigned char value)
/*check ccq */
static inline int
qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
{
xchg((char*)slsb,value);
char dbf_text[15];
if (ccq == 0 || ccq == 32 || ccq == 96)
return 0;
if (ccq == 97)
return 1;
/*notify devices immediately*/
sprintf(dbf_text,"%d", ccq);
QDIO_DBF_TEXT2(1,trace,dbf_text);
return -EIO;
}
/* EQBS: extract buffer states */
static inline int
qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
unsigned int *start, unsigned int *cnt)
{
struct qdio_irq *irq;
unsigned int tmp_cnt, q_no, ccq;
int rc ;
char dbf_text[15];
ccq = 0;
tmp_cnt = *cnt;
irq = (struct qdio_irq*)q->irq_ptr;
q_no = q->q_no;
if(!q->is_input_q)
q_no += irq->no_input_qs;
ccq = do_eqbs(irq->sch_token, state, q_no, start, cnt);
rc = qdio_check_ccq(q, ccq);
if (rc < 0) {
QDIO_DBF_TEXT2(1,trace,"eqberr");
sprintf(dbf_text,"%2x,%2x,%d,%d",tmp_cnt, *cnt, ccq, q_no);
QDIO_DBF_TEXT2(1,trace,dbf_text);
q->handler(q->cdev,QDIO_STATUS_ACTIVATE_CHECK_CONDITION|
QDIO_STATUS_LOOK_FOR_ERROR,
0, 0, 0, -1, -1, q->int_parm);
return 0;
}
return (tmp_cnt - *cnt);
}
/* SQBS: set buffer states */
static inline int
qdio_do_sqbs(struct qdio_q *q, unsigned char state,
unsigned int *start, unsigned int *cnt)
{
struct qdio_irq *irq;
unsigned int tmp_cnt, q_no, ccq;
int rc;
char dbf_text[15];
ccq = 0;
tmp_cnt = *cnt;
irq = (struct qdio_irq*)q->irq_ptr;
q_no = q->q_no;
if(!q->is_input_q)
q_no += irq->no_input_qs;
ccq = do_sqbs(irq->sch_token, state, q_no, start, cnt);
rc = qdio_check_ccq(q, ccq);
if (rc < 0) {
QDIO_DBF_TEXT3(1,trace,"sqberr");
sprintf(dbf_text,"%2x,%2x,%d,%d",tmp_cnt,*cnt,ccq,q_no);
QDIO_DBF_TEXT3(1,trace,dbf_text);
q->handler(q->cdev,QDIO_STATUS_ACTIVATE_CHECK_CONDITION|
QDIO_STATUS_LOOK_FOR_ERROR,
0, 0, 0, -1, -1, q->int_parm);
return 0;
}
return (tmp_cnt - *cnt);
}
static inline int
qdio_set_slsb(struct qdio_q *q, unsigned int *bufno,
unsigned char state, unsigned int *count)
{
volatile char *slsb;
struct qdio_irq *irq;
irq = (struct qdio_irq*)q->irq_ptr;
if (!irq->is_qebsm) {
slsb = (char *)&q->slsb.acc.val[(*bufno)];
xchg(slsb, state);
return 1;
}
return qdio_do_sqbs(q, state, bufno, count);
}
#ifdef CONFIG_QDIO_DEBUG
static inline void
qdio_trace_slsb(struct qdio_q *q)
{
if (q->queue_type==QDIO_TRACE_QTYPE) {
if (q->is_input_q)
QDIO_DBF_HEX2(0,slsb_in,&q->slsb,
QDIO_MAX_BUFFERS_PER_Q);
else
QDIO_DBF_HEX2(0,slsb_out,&q->slsb,
QDIO_MAX_BUFFERS_PER_Q);
}
}
#endif
static inline int
set_slsb(struct qdio_q *q, unsigned int *bufno,
unsigned char state, unsigned int *count)
{
int rc;
#ifdef CONFIG_QDIO_DEBUG
qdio_trace_slsb(q);
#endif
rc = qdio_set_slsb(q, bufno, state, count);
#ifdef CONFIG_QDIO_DEBUG
qdio_trace_slsb(q);
#endif
return rc;
}
static inline int
qdio_siga_sync(struct qdio_q *q, unsigned int gpr2,
unsigned int gpr3)
@ -155,7 +270,7 @@ qdio_siga_sync(struct qdio_q *q, unsigned int gpr2,
perf_stats.siga_syncs++;
#endif /* QDIO_PERFORMANCE_STATS */
cc = do_siga_sync(q->irq, gpr2, gpr3);
cc = do_siga_sync(0x10000|q->irq, gpr2, gpr3);
if (cc)
QDIO_DBF_HEX3(0,trace,&cc,sizeof(int*));
@ -170,6 +285,19 @@ qdio_siga_sync_q(struct qdio_q *q)
return qdio_siga_sync(q, q->mask, 0);
}
static int
__do_siga_output(struct qdio_q *q, unsigned int *busy_bit)
{
struct qdio_irq *irq;
unsigned int fc = 0;
irq = (struct qdio_irq *) q->irq_ptr;
if (!irq->is_qebsm)
return do_siga_output(0x10000|q->irq, q->mask, busy_bit, fc);
fc |= 0x80;
return do_siga_output(irq->sch_token, q->mask, busy_bit, fc);
}
/*
* returns QDIO_SIGA_ERROR_ACCESS_EXCEPTION as cc, when SIGA returns
* an access exception
@ -189,7 +317,7 @@ qdio_siga_output(struct qdio_q *q)
QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
for (;;) {
cc = do_siga_output(q->irq, q->mask, &busy_bit);
cc = __do_siga_output(q, &busy_bit);
//QDIO_PRINT_ERR("cc=%x, busy=%x\n",cc,busy_bit);
if ((cc==2) && (busy_bit) && (q->is_iqdio_q)) {
if (!start_time)
@ -221,7 +349,7 @@ qdio_siga_input(struct qdio_q *q)
perf_stats.siga_ins++;
#endif /* QDIO_PERFORMANCE_STATS */
cc = do_siga_input(q->irq, q->mask);
cc = do_siga_input(0x10000|q->irq, q->mask);
if (cc)
QDIO_DBF_HEX3(0,trace,&cc,sizeof(int*));
@ -230,7 +358,7 @@ qdio_siga_input(struct qdio_q *q)
}
/* locked by the locks in qdio_activate and qdio_cleanup */
static __u32 volatile *
static __u32 *
qdio_get_indicator(void)
{
int i;
@ -258,7 +386,7 @@ qdio_put_indicator(__u32 *addr)
atomic_dec(&spare_indicator_usecount);
}
static inline volatile void
static inline void
tiqdio_clear_summary_bit(__u32 *location)
{
QDIO_DBF_TEXT5(0,trace,"clrsummb");
@ -267,7 +395,7 @@ tiqdio_clear_summary_bit(__u32 *location)
xchg(location,0);
}
static inline volatile void
static inline void
tiqdio_set_summary_bit(__u32 *location)
{
QDIO_DBF_TEXT5(0,trace,"setsummb");
@ -336,7 +464,9 @@ static inline int
qdio_stop_polling(struct qdio_q *q)
{
#ifdef QDIO_USE_PROCESSING_STATE
int gsf;
unsigned int tmp, gsf, count = 1;
unsigned char state = 0;
struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;
if (!atomic_swap(&q->polling,0))
return 1;
@ -348,17 +478,22 @@ qdio_stop_polling(struct qdio_q *q)
if (!q->is_input_q)
return 1;
gsf=GET_SAVED_FRONTIER(q);
set_slsb(&q->slsb.acc.val[(gsf+QDIO_MAX_BUFFERS_PER_Q-1)&
(QDIO_MAX_BUFFERS_PER_Q-1)],
SLSB_P_INPUT_NOT_INIT);
tmp = gsf = GET_SAVED_FRONTIER(q);
tmp = ((tmp + QDIO_MAX_BUFFERS_PER_Q-1) & (QDIO_MAX_BUFFERS_PER_Q-1) );
set_slsb(q, &tmp, SLSB_P_INPUT_NOT_INIT, &count);
/*
* we don't issue this SYNC_MEMORY, as we trust Rick T and
* moreover will not use the PROCESSING state under VM, so
* q->polling was 0 anyway
*/
/*SYNC_MEMORY;*/
if (q->slsb.acc.val[gsf]!=SLSB_P_INPUT_PRIMED)
if (irq->is_qebsm) {
count = 1;
qdio_do_eqbs(q, &state, &gsf, &count);
} else
state = q->slsb.acc.val[gsf];
if (state != SLSB_P_INPUT_PRIMED)
return 1;
/*
* set our summary bit again, as otherwise there is a
@ -431,18 +566,136 @@ tiqdio_clear_global_summary(void)
/************************* OUTBOUND ROUTINES *******************************/
static int
qdio_qebsm_get_outbound_buffer_frontier(struct qdio_q *q)
{
struct qdio_irq *irq;
unsigned char state;
unsigned int cnt, count, ftc;
irq = (struct qdio_irq *) q->irq_ptr;
if ((!q->is_iqdio_q) && (!q->hydra_gives_outbound_pcis))
SYNC_MEMORY;
ftc = q->first_to_check;
count = qdio_min(atomic_read(&q->number_of_buffers_used),
(QDIO_MAX_BUFFERS_PER_Q-1));
if (count == 0)
return q->first_to_check;
cnt = qdio_do_eqbs(q, &state, &ftc, &count);
if (cnt == 0)
return q->first_to_check;
switch (state) {
case SLSB_P_OUTPUT_ERROR:
QDIO_DBF_TEXT3(0,trace,"outperr");
atomic_sub(cnt , &q->number_of_buffers_used);
if (q->qdio_error)
q->error_status_flags |=
QDIO_STATUS_MORE_THAN_ONE_QDIO_ERROR;
q->qdio_error = SLSB_P_OUTPUT_ERROR;
q->error_status_flags |= QDIO_STATUS_LOOK_FOR_ERROR;
q->first_to_check = ftc;
break;
case SLSB_P_OUTPUT_EMPTY:
QDIO_DBF_TEXT5(0,trace,"outpempt");
atomic_sub(cnt, &q->number_of_buffers_used);
q->first_to_check = ftc;
break;
case SLSB_CU_OUTPUT_PRIMED:
/* all buffers primed */
QDIO_DBF_TEXT5(0,trace,"outpprim");
break;
default:
break;
}
QDIO_DBF_HEX4(0,trace,&q->first_to_check,sizeof(int));
return q->first_to_check;
}
static int
qdio_qebsm_get_inbound_buffer_frontier(struct qdio_q *q)
{
struct qdio_irq *irq;
unsigned char state;
int tmp, ftc, count, cnt;
char dbf_text[15];
irq = (struct qdio_irq *) q->irq_ptr;
ftc = q->first_to_check;
count = qdio_min(atomic_read(&q->number_of_buffers_used),
(QDIO_MAX_BUFFERS_PER_Q-1));
if (count == 0)
return q->first_to_check;
cnt = qdio_do_eqbs(q, &state, &ftc, &count);
if (cnt == 0)
return q->first_to_check;
switch (state) {
case SLSB_P_INPUT_ERROR :
#ifdef CONFIG_QDIO_DEBUG
QDIO_DBF_TEXT3(1,trace,"inperr");
sprintf(dbf_text,"%2x,%2x",ftc,count);
QDIO_DBF_TEXT3(1,trace,dbf_text);
#endif /* CONFIG_QDIO_DEBUG */
if (q->qdio_error)
q->error_status_flags |=
QDIO_STATUS_MORE_THAN_ONE_QDIO_ERROR;
q->qdio_error = SLSB_P_INPUT_ERROR;
q->error_status_flags |= QDIO_STATUS_LOOK_FOR_ERROR;
atomic_sub(cnt, &q->number_of_buffers_used);
q->first_to_check = ftc;
break;
case SLSB_P_INPUT_PRIMED :
QDIO_DBF_TEXT3(0,trace,"inptprim");
sprintf(dbf_text,"%2x,%2x",ftc,count);
QDIO_DBF_TEXT3(1,trace,dbf_text);
tmp = 0;
ftc = q->first_to_check;
#ifdef QDIO_USE_PROCESSING_STATE
if (cnt > 1) {
cnt -= 1;
tmp = set_slsb(q, &ftc, SLSB_P_INPUT_NOT_INIT, &cnt);
if (!tmp)
break;
}
cnt = 1;
tmp += set_slsb(q, &ftc,
SLSB_P_INPUT_PROCESSING, &cnt);
atomic_set(&q->polling, 1);
#else
tmp = set_slsb(q, &ftc, SLSB_P_INPUT_NOT_INIT, &cnt);
#endif
atomic_sub(tmp, &q->number_of_buffers_used);
q->first_to_check = ftc;
break;
case SLSB_CU_INPUT_EMPTY:
case SLSB_P_INPUT_NOT_INIT:
case SLSB_P_INPUT_PROCESSING:
QDIO_DBF_TEXT5(0,trace,"inpnipro");
break;
default:
break;
}
QDIO_DBF_HEX4(0,trace,&q->first_to_check,sizeof(int));
return q->first_to_check;
}
static inline int
qdio_get_outbound_buffer_frontier(struct qdio_q *q)
{
int f,f_mod_no;
struct qdio_irq *irq;
volatile char *slsb;
int first_not_to_check;
unsigned int count = 1;
int first_not_to_check, f, f_mod_no;
char dbf_text[15];
QDIO_DBF_TEXT4(0,trace,"getobfro");
QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
irq = (struct qdio_irq *) q->irq_ptr;
if (irq->is_qebsm)
return qdio_qebsm_get_outbound_buffer_frontier(q);
slsb=&q->slsb.acc.val[0];
f_mod_no=f=q->first_to_check;
/*
@ -484,7 +737,7 @@ check_next:
QDIO_DBF_HEX2(1,sbal,q->sbal[f_mod_no],256);
/* kind of process the buffer */
set_slsb(&q->slsb.acc.val[f_mod_no], SLSB_P_OUTPUT_NOT_INIT);
set_slsb(q, &f_mod_no, SLSB_P_OUTPUT_NOT_INIT, &count);
/*
* we increment the frontier, as this buffer
@ -743,8 +996,10 @@ qdio_outbound_processing(struct qdio_q *q)
static inline int
qdio_get_inbound_buffer_frontier(struct qdio_q *q)
{
struct qdio_irq *irq;
int f,f_mod_no;
volatile char *slsb;
unsigned int count = 1;
int first_not_to_check;
#ifdef CONFIG_QDIO_DEBUG
char dbf_text[15];
@ -756,6 +1011,10 @@ qdio_get_inbound_buffer_frontier(struct qdio_q *q)
QDIO_DBF_TEXT4(0,trace,"getibfro");
QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
irq = (struct qdio_irq *) q->irq_ptr;
if (irq->is_qebsm)
return qdio_qebsm_get_inbound_buffer_frontier(q);
slsb=&q->slsb.acc.val[0];
f_mod_no=f=q->first_to_check;
/*
@ -792,19 +1051,19 @@ check_next:
* kill VM in terms of CP overhead
*/
if (q->siga_sync) {
set_slsb(&slsb[f_mod_no],SLSB_P_INPUT_NOT_INIT);
set_slsb(q, &f_mod_no, SLSB_P_INPUT_NOT_INIT, &count);
} else {
/* set the previous buffer to NOT_INIT. The current
* buffer will be set to PROCESSING at the end of
* this function to avoid further interrupts. */
if (last_position>=0)
set_slsb(&slsb[last_position],
SLSB_P_INPUT_NOT_INIT);
set_slsb(q, &last_position,
SLSB_P_INPUT_NOT_INIT, &count);
atomic_set(&q->polling,1);
last_position=f_mod_no;
}
#else /* QDIO_USE_PROCESSING_STATE */
set_slsb(&slsb[f_mod_no],SLSB_P_INPUT_NOT_INIT);
set_slsb(q, &f_mod_no, SLSB_P_INPUT_NOT_INIT, &count);
#endif /* QDIO_USE_PROCESSING_STATE */
/*
* not needed, as the inbound queue will be synced on the next
@ -829,7 +1088,7 @@ check_next:
QDIO_DBF_HEX2(1,sbal,q->sbal[f_mod_no],256);
/* kind of process the buffer */
set_slsb(&slsb[f_mod_no],SLSB_P_INPUT_NOT_INIT);
set_slsb(q, &f_mod_no, SLSB_P_INPUT_NOT_INIT, &count);
if (q->qdio_error)
q->error_status_flags|=
@ -857,7 +1116,7 @@ out:
#ifdef QDIO_USE_PROCESSING_STATE
if (last_position>=0)
set_slsb(&slsb[last_position],SLSB_P_INPUT_PROCESSING);
set_slsb(q, &last_position, SLSB_P_INPUT_NOT_INIT, &count);
#endif /* QDIO_USE_PROCESSING_STATE */
QDIO_DBF_HEX4(0,trace,&q->first_to_check,sizeof(int));
@ -902,6 +1161,10 @@ static inline int
tiqdio_is_inbound_q_done(struct qdio_q *q)
{
int no_used;
unsigned int start_buf, count;
unsigned char state = 0;
struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;
#ifdef CONFIG_QDIO_DEBUG
char dbf_text[15];
#endif
@ -927,8 +1190,13 @@ tiqdio_is_inbound_q_done(struct qdio_q *q)
if (!q->siga_sync)
/* we'll check for more primed buffers in qeth_stop_polling */
return 0;
if (q->slsb.acc.val[q->first_to_check]!=SLSB_P_INPUT_PRIMED)
if (irq->is_qebsm) {
count = 1;
start_buf = q->first_to_check;
qdio_do_eqbs(q, &state, &start_buf, &count);
} else
state = q->slsb.acc.val[q->first_to_check];
if (state != SLSB_P_INPUT_PRIMED)
/*
* nothing more to do, if next buffer is not PRIMED.
* note that we did a SYNC_MEMORY before, that there
@ -955,6 +1223,10 @@ static inline int
qdio_is_inbound_q_done(struct qdio_q *q)
{
int no_used;
unsigned int start_buf, count;
unsigned char state = 0;
struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;
#ifdef CONFIG_QDIO_DEBUG
char dbf_text[15];
#endif
@ -973,8 +1245,13 @@ qdio_is_inbound_q_done(struct qdio_q *q)
QDIO_DBF_TEXT4(0,trace,dbf_text);
return 1;
}
if (q->slsb.acc.val[q->first_to_check]==SLSB_P_INPUT_PRIMED) {
if (irq->is_qebsm) {
count = 1;
start_buf = q->first_to_check;
qdio_do_eqbs(q, &state, &start_buf, &count);
} else
state = q->slsb.acc.val[q->first_to_check];
if (state == SLSB_P_INPUT_PRIMED) {
/* we got something to do */
QDIO_DBF_TEXT4(0,trace,"inqisntA");
QDIO_DBF_HEX4(0,trace,&q,sizeof(void*));
@ -1523,10 +1800,10 @@ qdio_fill_qs(struct qdio_irq *irq_ptr, struct ccw_device *cdev,
QDIO_DBF_HEX2(0,setup,&ptr,sizeof(void*));
/* fill in slsb */
for (j=0;j<QDIO_MAX_BUFFERS_PER_Q;j++) {
set_slsb(&q->slsb.acc.val[j],
SLSB_P_INPUT_NOT_INIT);
/* q->sbal[j]->element[1].sbalf.i1.key=QDIO_STORAGE_KEY;*/
if (!irq_ptr->is_qebsm) {
unsigned int count = 1;
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
set_slsb(q, &j, SLSB_P_INPUT_NOT_INIT, &count);
}
}
@ -1584,10 +1861,10 @@ qdio_fill_qs(struct qdio_irq *irq_ptr, struct ccw_device *cdev,
QDIO_DBF_HEX2(0,setup,&ptr,sizeof(void*));
/* fill in slsb */
for (j=0;j<QDIO_MAX_BUFFERS_PER_Q;j++) {
set_slsb(&q->slsb.acc.val[j],
SLSB_P_OUTPUT_NOT_INIT);
/* q->sbal[j]->element[1].sbalf.i1.key=QDIO_STORAGE_KEY;*/
if (!irq_ptr->is_qebsm) {
unsigned int count = 1;
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
set_slsb(q, &j, SLSB_P_OUTPUT_NOT_INIT, &count);
}
}
}
@ -1905,7 +2182,7 @@ int
qdio_synchronize(struct ccw_device *cdev, unsigned int flags,
unsigned int queue_number)
{
int cc;
int cc = 0;
struct qdio_q *q;
struct qdio_irq *irq_ptr;
void *ptr;
@ -1929,12 +2206,14 @@ qdio_synchronize(struct ccw_device *cdev, unsigned int flags,
q=irq_ptr->input_qs[queue_number];
if (!q)
return -EINVAL;
cc = do_siga_sync(q->irq, 0, q->mask);
if (!(irq_ptr->is_qebsm))
cc = do_siga_sync(0x10000|q->irq, 0, q->mask);
} else if (flags&QDIO_FLAG_SYNC_OUTPUT) {
q=irq_ptr->output_qs[queue_number];
if (!q)
return -EINVAL;
cc = do_siga_sync(q->irq, q->mask, 0);
if (!(irq_ptr->is_qebsm))
cc = do_siga_sync(0x10000|q->irq, q->mask, 0);
} else
return -EINVAL;
@ -1945,12 +2224,49 @@ qdio_synchronize(struct ccw_device *cdev, unsigned int flags,
return cc;
}
static unsigned char
qdio_check_siga_needs(int sch)
static inline void
qdio_check_subchannel_qebsm(struct qdio_irq *irq_ptr, unsigned char qdioac,
unsigned long token)
{
struct qdio_q *q;
int i;
unsigned int count, start_buf;
char dbf_text[15];
/*check if QEBSM is disabled */
if (!(irq_ptr->is_qebsm) || !(qdioac & 0x01)) {
irq_ptr->is_qebsm = 0;
irq_ptr->sch_token = 0;
irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
QDIO_DBF_TEXT0(0,setup,"noV=V");
return;
}
irq_ptr->sch_token = token;
/*input queue*/
for (i = 0; i < irq_ptr->no_input_qs;i++) {
q = irq_ptr->input_qs[i];
count = QDIO_MAX_BUFFERS_PER_Q;
start_buf = 0;
set_slsb(q, &start_buf, SLSB_P_INPUT_NOT_INIT, &count);
}
sprintf(dbf_text,"V=V:%2x",irq_ptr->is_qebsm);
QDIO_DBF_TEXT0(0,setup,dbf_text);
sprintf(dbf_text,"%8lx",irq_ptr->sch_token);
QDIO_DBF_TEXT0(0,setup,dbf_text);
/*output queue*/
for (i = 0; i < irq_ptr->no_output_qs; i++) {
q = irq_ptr->output_qs[i];
count = QDIO_MAX_BUFFERS_PER_Q;
start_buf = 0;
set_slsb(q, &start_buf, SLSB_P_OUTPUT_NOT_INIT, &count);
}
}
static void
qdio_get_ssqd_information(struct qdio_irq *irq_ptr)
{
int result;
unsigned char qdioac;
struct {
struct chsc_header request;
u16 reserved1;
@ -1964,67 +2280,80 @@ qdio_check_siga_needs(int sch)
u8 reserved5;
u16 sch;
u8 qfmt;
u8 reserved6;
u8 qdioac;
u8 parm;
u8 qdioac1;
u8 sch_class;
u8 reserved7;
u8 icnt;
u8 reserved8;
u8 ocnt;
u8 reserved9;
u8 mbccnt;
u16 qdioac2;
u64 sch_token;
} *ssqd_area;
QDIO_DBF_TEXT0(0,setup,"getssqd");
qdioac = 0;
ssqd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!ssqd_area) {
QDIO_PRINT_WARN("Could not get memory for chsc. Using all " \
"SIGAs for sch x%x.\n", sch);
return CHSC_FLAG_SIGA_INPUT_NECESSARY ||
"SIGAs for sch x%x.\n", irq_ptr->irq);
irq_ptr->qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY ||
CHSC_FLAG_SIGA_OUTPUT_NECESSARY ||
CHSC_FLAG_SIGA_SYNC_NECESSARY; /* all flags set */
irq_ptr->is_qebsm = 0;
irq_ptr->sch_token = 0;
irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
return;
}
ssqd_area->request = (struct chsc_header) {
.length = 0x0010,
.code = 0x0024,
};
ssqd_area->first_sch = sch;
ssqd_area->last_sch = sch;
ssqd_area->first_sch = irq_ptr->irq;
ssqd_area->last_sch = irq_ptr->irq;
result = chsc(ssqd_area);
if (result) {
QDIO_PRINT_WARN("CHSC returned cc %i. Using all " \
"SIGAs for sch x%x.\n",
result,sch);
result, irq_ptr->irq);
qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY ||
CHSC_FLAG_SIGA_OUTPUT_NECESSARY ||
CHSC_FLAG_SIGA_SYNC_NECESSARY; /* all flags set */
irq_ptr->is_qebsm = 0;
goto out;
}
if (ssqd_area->response.code != QDIO_CHSC_RESPONSE_CODE_OK) {
QDIO_PRINT_WARN("response upon checking SIGA needs " \
"is 0x%x. Using all SIGAs for sch x%x.\n",
ssqd_area->response.code, sch);
ssqd_area->response.code, irq_ptr->irq);
qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY ||
CHSC_FLAG_SIGA_OUTPUT_NECESSARY ||
CHSC_FLAG_SIGA_SYNC_NECESSARY; /* all flags set */
irq_ptr->is_qebsm = 0;
goto out;
}
if (!(ssqd_area->flags & CHSC_FLAG_QDIO_CAPABILITY) ||
!(ssqd_area->flags & CHSC_FLAG_VALIDITY) ||
(ssqd_area->sch != sch)) {
(ssqd_area->sch != irq_ptr->irq)) {
QDIO_PRINT_WARN("huh? problems checking out sch x%x... " \
"using all SIGAs.\n",sch);
"using all SIGAs.\n",irq_ptr->irq);
qdioac = CHSC_FLAG_SIGA_INPUT_NECESSARY |
CHSC_FLAG_SIGA_OUTPUT_NECESSARY |
CHSC_FLAG_SIGA_SYNC_NECESSARY; /* worst case */
irq_ptr->is_qebsm = 0;
goto out;
}
qdioac = ssqd_area->qdioac;
qdioac = ssqd_area->qdioac1;
out:
qdio_check_subchannel_qebsm(irq_ptr, qdioac,
ssqd_area->sch_token);
free_page ((unsigned long) ssqd_area);
return qdioac;
irq_ptr->qdioac = qdioac;
}
static unsigned int
@ -2055,6 +2384,13 @@ tiqdio_check_chsc_availability(void)
sprintf(dbf_text,"hydrati%1x", hydra_thinints);
QDIO_DBF_TEXT0(0,setup,dbf_text);
#ifdef CONFIG_ARCH_S390X
/* Check for QEBSM support in general (bit 58). */
is_passthrough = css_general_characteristics.qebsm;
#endif
sprintf(dbf_text,"cssQBS:%1x", is_passthrough);
QDIO_DBF_TEXT0(0,setup,dbf_text);
/* Check for aif time delay disablement fac (bit 56). If installed,
* omit svs even under lpar (good point by rick again) */
omit_svs = css_general_characteristics.aif_tdd;
@ -2747,6 +3083,10 @@ int qdio_fill_irq(struct qdio_initialize *init_data)
irq_ptr->qdr->qkey=QDIO_STORAGE_KEY;
/* fill in qib */
irq_ptr->is_qebsm = is_passthrough;
if (irq_ptr->is_qebsm)
irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
irq_ptr->qib.qfmt=init_data->q_format;
if (init_data->no_input_qs)
irq_ptr->qib.isliba=(unsigned long)(irq_ptr->input_qs[0]->slib);
@ -2884,7 +3224,7 @@ qdio_establish(struct qdio_initialize *init_data)
return -EIO;
}
irq_ptr->qdioac=qdio_check_siga_needs(irq_ptr->irq);
qdio_get_ssqd_information(irq_ptr);
/* if this gets set once, we're running under VM and can omit SVSes */
if (irq_ptr->qdioac&CHSC_FLAG_SIGA_SYNC_NECESSARY)
omit_svs=1;
@ -3015,30 +3355,40 @@ static inline void
qdio_do_qdio_fill_input(struct qdio_q *q, unsigned int qidx,
unsigned int count, struct qdio_buffer *buffers)
{
struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;
qidx &= (QDIO_MAX_BUFFERS_PER_Q - 1);
if (irq->is_qebsm) {
while (count)
set_slsb(q, &qidx, SLSB_CU_INPUT_EMPTY, &count);
return;
}
for (;;) {
set_slsb(&q->slsb.acc.val[qidx],SLSB_CU_INPUT_EMPTY);
set_slsb(q, &qidx, SLSB_CU_INPUT_EMPTY, &count);
count--;
if (!count) break;
qidx = (qidx + 1) & (QDIO_MAX_BUFFERS_PER_Q - 1);
}
/* not necessary, as the queues are synced during the SIGA read */
/*SYNC_MEMORY;*/
}
static inline void
qdio_do_qdio_fill_output(struct qdio_q *q, unsigned int qidx,
unsigned int count, struct qdio_buffer *buffers)
{
struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;
qidx &= (QDIO_MAX_BUFFERS_PER_Q - 1);
if (irq->is_qebsm) {
while (count)
set_slsb(q, &qidx, SLSB_CU_OUTPUT_PRIMED, &count);
return;
}
for (;;) {
set_slsb(&q->slsb.acc.val[qidx],SLSB_CU_OUTPUT_PRIMED);
set_slsb(q, &qidx, SLSB_CU_OUTPUT_PRIMED, &count);
count--;
if (!count) break;
qidx = (qidx + 1) & (QDIO_MAX_BUFFERS_PER_Q - 1);
}
/* SIGA write will sync the queues */
/*SYNC_MEMORY;*/
}
static inline void
@ -3083,6 +3433,9 @@ do_qdio_handle_outbound(struct qdio_q *q, unsigned int callflags,
struct qdio_buffer *buffers)
{
int used_elements;
unsigned int cnt, start_buf;
unsigned char state = 0;
struct qdio_irq *irq = (struct qdio_irq *) q->irq_ptr;
/* This is the outbound handling of queues */
#ifdef QDIO_PERFORMANCE_STATS
@ -3115,9 +3468,15 @@ do_qdio_handle_outbound(struct qdio_q *q, unsigned int callflags,
* SYNC_MEMORY :-/ ), we try to
* fast-requeue buffers
*/
if (q->slsb.acc.val[(qidx+QDIO_MAX_BUFFERS_PER_Q-1)
&(QDIO_MAX_BUFFERS_PER_Q-1)]!=
SLSB_CU_OUTPUT_PRIMED) {
if (irq->is_qebsm) {
cnt = 1;
start_buf = ((qidx+QDIO_MAX_BUFFERS_PER_Q-1) &
(QDIO_MAX_BUFFERS_PER_Q-1));
qdio_do_eqbs(q, &state, &start_buf, &cnt);
} else
state = q->slsb.acc.val[(qidx+QDIO_MAX_BUFFERS_PER_Q-1)
&(QDIO_MAX_BUFFERS_PER_Q-1) ];
if (state != SLSB_CU_OUTPUT_PRIMED) {
qdio_kick_outbound_q(q);
} else {
QDIO_DBF_TEXT3(0,trace, "fast-req");

104
drivers/s390/cio/qdio.h
View File

@ -3,14 +3,13 @@
#include <asm/page.h>
#define VERSION_CIO_QDIO_H "$Revision: 1.33 $"
#define VERSION_CIO_QDIO_H "$Revision: 1.37 $"
#ifdef CONFIG_QDIO_DEBUG
#define QDIO_VERBOSE_LEVEL 9
#else /* CONFIG_QDIO_DEBUG */
#define QDIO_VERBOSE_LEVEL 5
#endif /* CONFIG_QDIO_DEBUG */
#define QDIO_USE_PROCESSING_STATE
#ifdef CONFIG_QDIO_PERF_STATS
@ -265,6 +264,58 @@ QDIO_PRINT_##importance(header "%02x %02x %02x %02x %02x %02x %02x %02x " \
/*
* Some instructions as assembly
*/
static inline int
do_sqbs(unsigned long sch, unsigned char state, int queue,
unsigned int *start, unsigned int *count)
{
#ifdef CONFIG_ARCH_S390X
register unsigned long _ccq asm ("0") = *count;
register unsigned long _sch asm ("1") = sch;
unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
asm volatile (
" .insn rsy,0xeb000000008A,%1,0,0(%2)\n\t"
: "+d" (_ccq), "+d" (_queuestart)
: "d" ((unsigned long)state), "d" (_sch)
: "memory", "cc"
);
*count = _ccq & 0xff;
*start = _queuestart & 0xff;
return (_ccq >> 32) & 0xff;
#else
return 0;
#endif
}
static inline int
do_eqbs(unsigned long sch, unsigned char *state, int queue,
unsigned int *start, unsigned int *count)
{
#ifdef CONFIG_ARCH_S390X
register unsigned long _ccq asm ("0") = *count;
register unsigned long _sch asm ("1") = sch;
unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
unsigned long _state = 0;
asm volatile (
" .insn rrf,0xB99c0000,%1,%2,0,0 \n\t"
: "+d" (_ccq), "+d" (_queuestart), "+d" (_state)
: "d" (_sch)
: "memory", "cc"
);
*count = _ccq & 0xff;
*start = _queuestart & 0xff;
*state = _state & 0xff;
return (_ccq >> 32) & 0xff;
#else
return 0;
#endif
}
static inline int
do_siga_sync(unsigned int irq, unsigned int mask1, unsigned int mask2)
{
@ -280,7 +331,7 @@ do_siga_sync(unsigned int irq, unsigned int mask1, unsigned int mask2)
"ipm %0 \n\t"
"srl %0,28 \n\t"
: "=d" (cc)
: "d" (0x10000|irq), "d" (mask1), "d" (mask2)
: "d" (irq), "d" (mask1), "d" (mask2)
: "cc", "0", "1", "2", "3"
);
#else /* CONFIG_ARCH_S390X */
@ -293,7 +344,7 @@ do_siga_sync(unsigned int irq, unsigned int mask1, unsigned int mask2)
"ipm %0 \n\t"
"srl %0,28 \n\t"
: "=d" (cc)
: "d" (0x10000|irq), "d" (mask1), "d" (mask2)
: "d" (irq), "d" (mask1), "d" (mask2)
: "cc", "0", "1", "2", "3"
);
#endif /* CONFIG_ARCH_S390X */
@ -314,7 +365,7 @@ do_siga_input(unsigned int irq, unsigned int mask)
"ipm %0 \n\t"
"srl %0,28 \n\t"
: "=d" (cc)
: "d" (0x10000|irq), "d" (mask)
: "d" (irq), "d" (mask)
: "cc", "0", "1", "2", "memory"
);
#else /* CONFIG_ARCH_S390X */
@ -326,7 +377,7 @@ do_siga_input(unsigned int irq, unsigned int mask)
"ipm %0 \n\t"
"srl %0,28 \n\t"
: "=d" (cc)
: "d" (0x10000|irq), "d" (mask)
: "d" (irq), "d" (mask)
: "cc", "0", "1", "2", "memory"
);
#endif /* CONFIG_ARCH_S390X */
@ -335,7 +386,8 @@ do_siga_input(unsigned int irq, unsigned int mask)
}
static inline int
do_siga_output(unsigned long irq, unsigned long mask, __u32 *bb)
do_siga_output(unsigned long irq, unsigned long mask, __u32 *bb,
unsigned int fc)
{
int cc;
__u32 busy_bit;
@ -366,14 +418,14 @@ do_siga_output(unsigned long irq, unsigned long mask, __u32 *bb)
".long 0b,2b \n\t"
".previous \n\t"
: "=d" (cc), "=d" (busy_bit)
: "d" (0x10000|irq), "d" (mask),
: "d" (irq), "d" (mask),
"i" (QDIO_SIGA_ERROR_ACCESS_EXCEPTION)
: "cc", "0", "1", "2", "memory"
);
#else /* CONFIG_ARCH_S390X */
asm volatile (
"lghi 0,0 \n\t"
"llgfr 1,%2 \n\t"
"llgfr 0,%5 \n\t"
"lgr 1,%2 \n\t"
"llgfr 2,%3 \n\t"
"siga 0 \n\t"
"0:"
@ -391,8 +443,8 @@ do_siga_output(unsigned long irq, unsigned long mask, __u32 *bb)
".quad 0b,1b \n\t"
".previous \n\t"
: "=d" (cc), "=d" (busy_bit)
: "d" (0x10000|irq), "d" (mask),
"i" (QDIO_SIGA_ERROR_ACCESS_EXCEPTION)
: "d" (irq), "d" (mask),
"i" (QDIO_SIGA_ERROR_ACCESS_EXCEPTION), "d" (fc)
: "cc", "0", "1", "2", "memory"
);
#endif /* CONFIG_ARCH_S390X */
@ -494,33 +546,12 @@ struct qdio_perf_stats {
#define QDIO_GET_ADDR(x) ((__u32)(long)x)
#endif /* CONFIG_ARCH_S390X */
#ifdef CONFIG_QDIO_DEBUG
#define set_slsb(x,y) \
if(q->queue_type==QDIO_TRACE_QTYPE) { \
if(q->is_input_q) { \
QDIO_DBF_HEX2(0,slsb_in,&q->slsb,QDIO_MAX_BUFFERS_PER_Q); \
} else { \
QDIO_DBF_HEX2(0,slsb_out,&q->slsb,QDIO_MAX_BUFFERS_PER_Q); \
} \
} \
qdio_set_slsb(x,y); \
if(q->queue_type==QDIO_TRACE_QTYPE) { \
if(q->is_input_q) { \
QDIO_DBF_HEX2(0,slsb_in,&q->slsb,QDIO_MAX_BUFFERS_PER_Q); \
} else { \
QDIO_DBF_HEX2(0,slsb_out,&q->slsb,QDIO_MAX_BUFFERS_PER_Q); \
} \
}
#else /* CONFIG_QDIO_DEBUG */
#define set_slsb(x,y) qdio_set_slsb(x,y)
#endif /* CONFIG_QDIO_DEBUG */
struct qdio_q {
volatile struct slsb slsb;
char unused[QDIO_MAX_BUFFERS_PER_Q];
__u32 * volatile dev_st_chg_ind;
__u32 * dev_st_chg_ind;
int is_input_q;
int irq;
@ -568,6 +599,7 @@ struct qdio_q {
struct tasklet_struct tasklet;
#endif /* QDIO_USE_TIMERS_FOR_POLLING */
enum qdio_irq_states state;
/* used to store the error condition during a data transfer */
@ -624,6 +656,10 @@ struct qdio_irq {
unsigned int hydra_gives_outbound_pcis;
unsigned int sync_done_on_outb_pcis;
/* QEBSM facility */
unsigned int is_qebsm;
unsigned long sch_token;
enum qdio_irq_states state;
unsigned int no_input_qs;

4
include/asm-s390/qdio.h
View File

@ -197,10 +197,12 @@ struct qdr {
*/
#define QIB_AC_INBOUND_PCI_SUPPORTED 0x80
#define QIB_AC_OUTBOUND_PCI_SUPPORTED 0x40
#define QIB_RFLAGS_ENABLE_QEBSM 0x80
struct qib {
unsigned int qfmt : 8; /* queue format */
unsigned int pfmt : 8; /* impl. dep. parameter format */
unsigned int res1 : 8; /* reserved */
unsigned int rflags : 8; /* QEBSM */
unsigned int ac : 8; /* adapter characteristics */
unsigned int res2; /* reserved */
#ifdef QDIO_32_BIT