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Switch ctx_lock from mutex to rmlock.

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It is odd idea to serialize different MSI-X vectors.  Use of rmlocks
here allows them to execute in parallel, but still protects ctx.
If upper layers require any additional serialization -- they can
do it by themselves.
This commit is contained in:
Alexander Motin 2016-07-09 11:47:52 +00:00
parent 1be8a2635c
commit ef48f66349
1 changed files with 15 additions and 17 deletions
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32
sys/dev/ntb/ntb_hw/ntb_hw.c
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@ -50,6 +50,7 @@ __FBSDID("$FreeBSD$");
#include <sys/pciio.h>
#include <sys/queue.h>
#include <sys/rman.h>
#include <sys/rmlock.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
@ -220,10 +221,7 @@ struct ntb_softc {
void *ntb_ctx;
const struct ntb_ctx_ops *ctx_ops;
struct ntb_vec *msix_vec;
#define CTX_LOCK(sc) mtx_lock(&(sc)->ctx_lock)
#define CTX_UNLOCK(sc) mtx_unlock(&(sc)->ctx_lock)
#define CTX_ASSERT(sc,f) mtx_assert(&(sc)->ctx_lock, (f))
struct mtx ctx_lock;
struct rmlock ctx_lock;
uint32_t ppd;
enum ntb_conn_type conn_type;
@ -657,7 +655,7 @@ ntb_attach(device_t device)
callout_init(&ntb->lr_timer, 1);
callout_init(&ntb->peer_msix_work, 1);
mtx_init(&ntb->db_mask_lock, "ntb hw bits", NULL, MTX_SPIN);
mtx_init(&ntb->ctx_lock, "ntb ctx", NULL, MTX_DEF);
rm_init(&ntb->ctx_lock, "ntb ctx");
if (ntb->type == NTB_ATOM)
error = ntb_detect_atom(ntb);
@ -720,7 +718,7 @@ ntb_detach(device_t device)
ntb_teardown_interrupts(ntb);
mtx_destroy(&ntb->db_mask_lock);
mtx_destroy(&ntb->ctx_lock);
rm_destroy(&ntb->ctx_lock);
ntb_unmap_pci_bar(ntb);
@ -2012,17 +2010,15 @@ ntb_set_ctx(device_t dev, void *ctx, const struct ntb_ctx_ops *ops)
if (ctx == NULL || ops == NULL)
return (EINVAL);
if (ntb->ctx_ops != NULL)
return (EINVAL);
CTX_LOCK(ntb);
rm_wlock(&ntb->ctx_lock);
if (ntb->ctx_ops != NULL) {
CTX_UNLOCK(ntb);
rm_wunlock(&ntb->ctx_lock);
return (EINVAL);
}
ntb->ntb_ctx = ctx;
ntb->ctx_ops = ops;
CTX_UNLOCK(ntb);
rm_wunlock(&ntb->ctx_lock);
return (0);
}
@ -2047,10 +2043,10 @@ ntb_clear_ctx(device_t dev)
{
struct ntb_softc *ntb = device_get_softc(dev);
CTX_LOCK(ntb);
rm_wlock(&ntb->ctx_lock);
ntb->ntb_ctx = NULL;
ntb->ctx_ops = NULL;
CTX_UNLOCK(ntb);
rm_wunlock(&ntb->ctx_lock);
}
/*
@ -2064,11 +2060,12 @@ static void
ntb_link_event(device_t dev)
{
struct ntb_softc *ntb = device_get_softc(dev);
struct rm_priotracker ctx_tracker;
CTX_LOCK(ntb);
rm_rlock(&ntb->ctx_lock, &ctx_tracker);
if (ntb->ctx_ops != NULL && ntb->ctx_ops->link_event != NULL)
ntb->ctx_ops->link_event(ntb->ntb_ctx);
CTX_UNLOCK(ntb);
rm_runlock(&ntb->ctx_lock, &ctx_tracker);
}
/*
@ -2088,11 +2085,12 @@ static void
ntb_db_event(device_t dev, uint32_t vec)
{
struct ntb_softc *ntb = device_get_softc(dev);
struct rm_priotracker ctx_tracker;
CTX_LOCK(ntb);
rm_rlock(&ntb->ctx_lock, &ctx_tracker);
if (ntb->ctx_ops != NULL && ntb->ctx_ops->db_event != NULL)
ntb->ctx_ops->db_event(ntb->ntb_ctx, vec);
CTX_UNLOCK(ntb);
rm_runlock(&ntb->ctx_lock, &ctx_tracker);
}
static int