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Commit d3c3589b authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Michael S. Tsirkin
Browse files

ringtest: commonize implementation of poll_avail/poll_used 



Provide new primitives used_empty/avail_empty and
build poll_avail/poll_used on top of it.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 44d65ea1

tools/virtio/ringtest/main.c

+12 −0
Original line number Diff line number Diff line
@@ -96,6 +96,12 @@ void set_affinity(const char *arg) 
	assert(!ret);

}



void poll_used(void)

{

	while (used_empty())

		busy_wait();

}



static void __attribute__((__flatten__)) run_guest(void)

{

	int completed_before;
@@ -149,6 +155,12 @@ static void __attribute__((__flatten__)) run_guest(void) 
	}

}



void poll_avail(void)

{

	while (avail_empty())

		busy_wait();

}



static void __attribute__((__flatten__)) run_host(void)

{

	int completed_before;

tools/virtio/ringtest/main.h

+2 −2
Original line number Diff line number Diff line
@@ -56,15 +56,15 @@ void alloc_ring(void); 
int add_inbuf(unsigned, void *, void *);

void *get_buf(unsigned *, void **);

void disable_call();

bool used_empty();

bool enable_call();

void kick_available();

void poll_used();

/* host side */

void disable_kick();

bool avail_empty();

bool enable_kick();

bool use_buf(unsigned *, void **);

void call_used();

void poll_avail();



/* implemented by main */

extern bool do_sleep;

tools/virtio/ringtest/noring.c

+4 −2
Original line number Diff line number Diff line
@@ -24,8 +24,9 @@ void *get_buf(unsigned *lenp, void **bufp) 
	return "Buffer";

}



void poll_used(void)

bool used_empty()

{

	return false;

}



void disable_call()
@@ -54,8 +55,9 @@ bool enable_kick() 
	assert(0);

}



void poll_avail(void)

bool avail_empty()

{

	return false;

}



bool use_buf(unsigned *lenp, void **bufp)

tools/virtio/ringtest/ptr_ring.c

+4 −18
Original line number Diff line number Diff line
@@ -133,18 +133,9 @@ void *get_buf(unsigned *lenp, void **bufp) 
	return datap;

}



void poll_used(void)

bool used_empty()

{

	void *b;



	do {

		if (tailcnt == headcnt || __ptr_ring_full(&array)) {

			b = NULL;

			barrier();

		} else {

			b = "Buffer\n";

		}

	} while (!b);

	return (tailcnt == headcnt || __ptr_ring_full(&array));

}



void disable_call()
@@ -173,14 +164,9 @@ bool enable_kick() 
	assert(0);

}



void poll_avail(void)

bool avail_empty()

{

	void *b;



	do {

		barrier();

		b = __ptr_ring_peek(&array);

	} while (!b);

	return !__ptr_ring_peek(&array);

}



bool use_buf(unsigned *lenp, void **bufp)

tools/virtio/ringtest/ring.c

+6 −12
Original line number Diff line number Diff line
@@ -163,12 +163,11 @@ void *get_buf(unsigned *lenp, void **bufp) 
	return datap;

}



void poll_used(void)

bool used_empty()

{

	unsigned head = (ring_size - 1) & guest.last_used_idx;



	while (ring[head].flags & DESC_HW)

		busy_wait();

	return (ring[head].flags & DESC_HW);

}



void disable_call()
@@ -180,13 +179,11 @@ void disable_call() 


bool enable_call()

{

	unsigned head = (ring_size - 1) & guest.last_used_idx;



	event->call_index = guest.last_used_idx;

	/* Flush call index write */

	/* Barrier D (for pairing) */

	smp_mb();

	return ring[head].flags & DESC_HW;

	return used_empty();

}



void kick_available(void)
@@ -213,20 +210,17 @@ void disable_kick() 


bool enable_kick()

{

	unsigned head = (ring_size - 1) & host.used_idx;



	event->kick_index = host.used_idx;

	/* Barrier C (for pairing) */

	smp_mb();

	return !(ring[head].flags & DESC_HW);

	return avail_empty();

}



void poll_avail(void)

bool avail_empty()

{

	unsigned head = (ring_size - 1) & host.used_idx;



	while (!(ring[head].flags & DESC_HW))

		busy_wait();

	return !(ring[head].flags & DESC_HW);

}



bool use_buf(unsigned *lenp, void **bufp)