freebsd-skq/sys/mips/nlm/cms.c
jchandra 5239156d84 Switch to interrupt based message handling for XLP 8xx B0.
Fixup some style issues in the file as well.
2012-03-27 07:47:13 +00:00

502 lines
13 KiB
C

/*-
* Copyright 2003-2011 Netlogic Microsystems (Netlogic). All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* NETLOGIC_BSD */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/limits.h>
#include <sys/bus.h>
#include <sys/ktr.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/unistd.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <machine/reg.h>
#include <machine/cpu.h>
#include <machine/hwfunc.h>
#include <machine/mips_opcode.h>
#include <machine/param.h>
#include <machine/intr_machdep.h>
#include <mips/nlm/hal/mips-extns.h>
#include <mips/nlm/hal/haldefs.h>
#include <mips/nlm/hal/iomap.h>
#include <mips/nlm/hal/cop2.h>
#include <mips/nlm/hal/fmn.h>
#include <mips/nlm/hal/pic.h>
#include <mips/nlm/msgring.h>
#include <mips/nlm/interrupt.h>
#include <mips/nlm/xlp.h>
#define MSGRNG_NSTATIONS 1024
/*
* Keep track of our message ring handler threads, each core has a
* different message station. Ideally we will need to start a few
* message handling threads every core, and wake them up depending on
* load
*/
struct msgring_thread {
struct thread *thread; /* msgring handler threads */
int needed; /* thread needs to wake up */
};
static struct msgring_thread msgring_threads[XLP_MAX_CORES * XLP_MAX_THREADS];
static struct proc *msgring_proc; /* all threads are under a proc */
/*
* The device drivers can register a handler for the messages sent
* from a station (corresponding to the device).
*/
struct tx_stn_handler {
msgring_handler action;
void *arg;
};
static struct tx_stn_handler msgmap[MSGRNG_NSTATIONS];
static struct mtx msgmap_lock;
uint32_t xlp_msg_thread_mask;
static int xlp_msg_threads_per_core = XLP_MAX_THREADS;
static void create_msgring_thread(int hwtid);
static int msgring_process_fast_intr(void *arg);
/* Debug counters */
static int msgring_nintr[XLP_MAX_CORES * XLP_MAX_THREADS];
static int msgring_wakeup_sleep[XLP_MAX_CORES * XLP_MAX_THREADS];
static int msgring_wakeup_nosleep[XLP_MAX_CORES * XLP_MAX_THREADS];
static int fmn_msgcount[XLP_MAX_CORES * XLP_MAX_THREADS][4];
static int fmn_loops[XLP_MAX_CORES * XLP_MAX_THREADS];
/* Whether polled driver implementation */
static int polled = 0;
/* We do only i/o device credit setup here. CPU credit setup is now
* moved to xlp_msgring_cpu_init() so that the credits get setup
* only if the CPU exists. xlp_msgring_cpu_init() gets called from
* platform_init_ap; and this makes it easy for us to setup CMS
* credits for various types of XLP chips, with varying number of
* cpu's and cores.
*/
static void
xlp_cms_credit_setup(int credit)
{
uint64_t cmspcibase, cmsbase, pcibase;
uint32_t devoffset;
int dev, fn, maxqid;
int src, qid, i;
for (i = 0; i < XLP_MAX_NODES; i++) {
cmspcibase = nlm_get_cms_pcibase(i);
if (!nlm_dev_exists(XLP_IO_CMS_OFFSET(i)))
continue;
cmsbase = nlm_get_cms_regbase(i);
maxqid = nlm_read_reg(cmspcibase, XLP_PCI_DEVINFO_REG0);
for (dev = 0; dev < 8; dev++) {
for (fn = 0; fn < 8; fn++) {
devoffset = XLP_HDR_OFFSET(i, 0, dev, fn);
if (nlm_dev_exists(devoffset) == 0)
continue;
pcibase = nlm_pcicfg_base(devoffset);
src = nlm_qidstart(pcibase);
if (src == 0)
continue;
#if 0 /* Debug */
printf("Setup CMS credits for queues ");
printf("[%d to %d] from src %d\n", 0,
maxqid, src);
#endif
for (qid = 0; qid < maxqid; qid++)
nlm_cms_setup_credits(cmsbase, qid,
src, credit);
}
}
}
}
void
xlp_msgring_cpu_init(int node, int cpu, int credit)
{
uint64_t cmspcibase = nlm_get_cms_pcibase(node);
uint64_t cmsbase = nlm_get_cms_regbase(node);
int qid, maxqid, src;
maxqid = nlm_read_reg(cmspcibase, XLP_PCI_DEVINFO_REG0);
/* cpu credit setup is done only from thread-0 of each core */
if((cpu % 4) == 0) {
src = cpu << 2; /* each thread has 4 vc's */
for (qid = 0; qid < maxqid; qid++)
nlm_cms_setup_credits(cmsbase, qid, src, credit);
}
}
/*
* Drain out max_messages for the buckets set in the bucket mask.
* Use max_msgs = 0 to drain out all messages.
*/
int
xlp_handle_msg_vc(u_int vcmask, int max_msgs)
{
struct nlm_fmn_msg msg;
int srcid = 0, size = 0, code = 0;
struct tx_stn_handler *he;
uint32_t mflags, status;
int n_msgs = 0, vc, m, hwtid;
u_int msgmask;
hwtid = nlm_cpuid();
for (;;) {
/* check if VC empty */
mflags = nlm_save_flags_cop2();
status = nlm_read_c2_msgstatus1();
nlm_restore_flags(mflags);
msgmask = ((status >> 24) & 0xf) ^ 0xf;
msgmask &= vcmask;
if (msgmask == 0)
break;
m = 0;
for (vc = 0; vc < 4; vc++) {
if ((msgmask & (1 << vc)) == 0)
continue;
mflags = nlm_save_flags_cop2();
status = nlm_fmn_msgrcv(vc, &srcid, &size, &code,
&msg);
nlm_restore_flags(mflags);
if (status != 0) /* no msg or error */
continue;
if (srcid < 0 && srcid >= 1024) {
printf("[%s]: bad src id %d\n", __func__,
srcid);
continue;
}
he = &msgmap[srcid];
if(he->action != NULL)
(he->action)(vc, size, code, srcid, &msg,
he->arg);
#if 0
else
printf("[%s]: No Handler for msg from stn %d,"
" vc=%d, size=%d, msg0=%jx, droppinge\n",
__func__, srcid, vc, size,
(uintmax_t)msg.msg[0]);
#endif
fmn_msgcount[hwtid][vc] += 1;
m++; /* msgs handled in this iter */
}
if (m == 0)
break; /* nothing done in this iter */
n_msgs += m;
if (max_msgs > 0 && n_msgs >= max_msgs)
break;
}
return (n_msgs);
}
static void
xlp_discard_msg_vc(u_int vcmask)
{
struct nlm_fmn_msg msg;
int srcid = 0, size = 0, code = 0, vc;
uint32_t mflags, status;
for (vc = 0; vc < 4; vc++) {
for (;;) {
mflags = nlm_save_flags_cop2();
status = nlm_fmn_msgrcv(vc, &srcid,
&size, &code, &msg);
nlm_restore_flags(mflags);
/* break if there is no msg or error */
if (status != 0)
break;
}
}
}
void
xlp_cms_enable_intr(int node, int cpu, int type, int watermark)
{
uint64_t cmsbase;
int i, qid;
cmsbase = nlm_get_cms_regbase(node);
for (i = 0; i < 4; i++) {
qid = (i + (cpu * 4)) & 0x7f;
nlm_cms_per_queue_level_intr(cmsbase, qid, type, watermark);
nlm_cms_per_queue_timer_intr(cmsbase, qid, 0x1, 0);
}
}
static int
msgring_process_fast_intr(void *arg)
{
struct msgring_thread *mthd;
struct thread *td;
int cpu;
cpu = nlm_cpuid();
mthd = &msgring_threads[cpu];
msgring_nintr[cpu]++;
td = mthd->thread;
/* clear pending interrupts */
nlm_write_c0_eirr(1ULL << IRQ_MSGRING);
/* wake up the target thread */
mthd->needed = 1;
thread_lock(td);
if (TD_AWAITING_INTR(td)) {
msgring_wakeup_sleep[cpu]++;
TD_CLR_IWAIT(td);
sched_add(td, SRQ_INTR);
} else
msgring_wakeup_nosleep[cpu]++;
thread_unlock(td);
return (FILTER_HANDLED);
}
static void
msgring_process(void * arg)
{
volatile struct msgring_thread *mthd;
struct thread *td;
uint32_t mflags, msgstatus1;
int hwtid, nmsgs;
hwtid = (intptr_t)arg;
mthd = &msgring_threads[hwtid];
td = mthd->thread;
KASSERT(curthread == td,
("%s:msg_ithread and proc linkage out of sync", __func__));
/* First bind this thread to the right CPU */
thread_lock(td);
sched_bind(td, xlp_hwtid_to_cpuid[hwtid]);
thread_unlock(td);
if (hwtid != nlm_cpuid())
printf("Misscheduled hwtid %d != cpuid %d\n", hwtid,
nlm_cpuid());
xlp_discard_msg_vc(0xf);
xlp_msgring_cpu_init(nlm_nodeid(), nlm_cpuid(), CMS_DEFAULT_CREDIT);
if (polled == 0) {
mflags = nlm_save_flags_cop2();
nlm_fmn_cpu_init(IRQ_MSGRING, 0, 0, 0, 0, 0);
nlm_restore_flags(mflags);
xlp_cms_enable_intr(nlm_nodeid(), nlm_cpuid(), 0x2, 0);
/* clear pending interrupts.
* they will get re-raised if still valid */
nlm_write_c0_eirr(1ULL << IRQ_MSGRING);
}
/* start processing messages */
for (;;) {
atomic_store_rel_int(&mthd->needed, 0);
nmsgs = xlp_handle_msg_vc(0xf, 0);
/* sleep */
if (polled == 0) {
/* clear VC-pend bits */
mflags = nlm_save_flags_cop2();
msgstatus1 = nlm_read_c2_msgstatus1();
msgstatus1 |= (0xf << 16);
nlm_write_c2_msgstatus1(msgstatus1);
nlm_restore_flags(mflags);
thread_lock(td);
if (mthd->needed) {
thread_unlock(td);
continue;
}
sched_class(td, PRI_ITHD);
TD_SET_IWAIT(td);
mi_switch(SW_VOL, NULL);
thread_unlock(td);
} else
pause("wmsg", 1);
fmn_loops[hwtid]++;
}
}
static void
create_msgring_thread(int hwtid)
{
struct msgring_thread *mthd;
struct thread *td;
int error;
mthd = &msgring_threads[hwtid];
error = kproc_kthread_add(msgring_process, (void *)(uintptr_t)hwtid,
&msgring_proc, &td, RFSTOPPED, 2, "msgrngproc",
"msgthr%d", hwtid);
if (error)
panic("kproc_kthread_add() failed with %d", error);
mthd->thread = td;
thread_lock(td);
sched_class(td, PRI_ITHD);
sched_add(td, SRQ_INTR);
thread_unlock(td);
}
int
register_msgring_handler(int startb, int endb, msgring_handler action,
void *arg)
{
int i;
if (bootverbose)
printf("Register handler %d-%d %p(%p)\n",
startb, endb, action, arg);
KASSERT(startb >= 0 && startb <= endb && endb < MSGRNG_NSTATIONS,
("Invalid value for bucket range %d,%d", startb, endb));
mtx_lock_spin(&msgmap_lock);
for (i = startb; i <= endb; i++) {
KASSERT(msgmap[i].action == NULL,
("Bucket %d already used [action %p]", i, msgmap[i].action));
msgmap[i].action = action;
msgmap[i].arg = arg;
}
mtx_unlock_spin(&msgmap_lock);
return (0);
}
/*
* Initialize the messaging subsystem.
*
* Message Stations are shared among all threads in a cpu core, this
* has to be called once from every core which is online.
*/
static void
xlp_msgring_config(void *arg)
{
void *cookie;
unsigned int thrmask, mask;
int i;
/* used polled handler for Ax silion */
if (nlm_is_xlp8xx_ax())
polled = 1;
/* Don't poll on all threads, if polled */
if (polled)
xlp_msg_threads_per_core -= 1;
mtx_init(&msgmap_lock, "msgring", NULL, MTX_SPIN);
if (xlp_threads_per_core < xlp_msg_threads_per_core)
xlp_msg_threads_per_core = xlp_threads_per_core;
thrmask = ((1 << xlp_msg_threads_per_core) - 1);
mask = 0;
for (i = 0; i < XLP_MAX_CORES; i++) {
mask <<= XLP_MAX_THREADS;
mask |= thrmask;
}
xlp_msg_thread_mask = xlp_hw_thread_mask & mask;
#if 0
printf("CMS Message handler thread mask %#jx\n",
(uintmax_t)xlp_msg_thread_mask);
#endif
xlp_cms_credit_setup(CMS_DEFAULT_CREDIT);
create_msgring_thread(0);
cpu_establish_hardintr("msgring", msgring_process_fast_intr, NULL,
NULL, IRQ_MSGRING, INTR_TYPE_NET, &cookie);
}
/*
* Start message ring processing threads on other CPUs, after SMP start
*/
static void
start_msgring_threads(void *arg)
{
int hwt;
for (hwt = 1; hwt < XLP_MAX_CORES * XLP_MAX_THREADS; hwt++) {
if ((xlp_msg_thread_mask & (1 << hwt)) == 0)
continue;
create_msgring_thread(hwt);
}
}
SYSINIT(xlp_msgring_config, SI_SUB_DRIVERS, SI_ORDER_FIRST,
xlp_msgring_config, NULL);
SYSINIT(start_msgring_threads, SI_SUB_SMP, SI_ORDER_MIDDLE,
start_msgring_threads, NULL);
/*
* DEBUG support, XXX: static buffer, not locked
*/
static int
sys_print_debug(SYSCTL_HANDLER_ARGS)
{
int error, nb, i, fs;
static char xprintb[4096], *buf;
buf = xprintb;
fs = sizeof(xprintb);
nb = snprintf(buf, fs,
"\nID vc0 vc1 vc2 vc3 loops\n");
buf += nb;
fs -= nb;
for (i = 0; i < 32; i++) {
if ((xlp_hw_thread_mask & (1 << i)) == 0)
continue;
nb = snprintf(buf, fs,
"%2d: %8d %8d %8d %8d %8d\n", i,
fmn_msgcount[i][0], fmn_msgcount[i][1],
fmn_msgcount[i][2], fmn_msgcount[i][3],
fmn_loops[i]);
buf += nb;
fs -= nb;
}
error = SYSCTL_OUT(req, xprintb, buf - xprintb);
return (error);
}
SYSCTL_PROC(_debug, OID_AUTO, msgring, CTLTYPE_STRING | CTLFLAG_RD, 0, 0,
sys_print_debug, "A", "msgring debug info");