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DRI2: prevent swap wakes from waking MSC waiters 

If a few swaps were queued leading to a throttle related block on the
client, and then the client submitted an MSC wait, one of the previous
swap wakeups could have caused the MSC wait to complete early.  Add a
flag for this to prevent a swap wake from prematurely waking an MSC
waiter.

Reported-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Reviewed-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Jesse Barnes 2010-03-08 15:10:47 -08:00
parent b00d435ddf
commit 5933b0abc6
2 changed files with 27 additions and 11 deletions
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37
hw/xfree86/dri2/dri2.c
View File

@ -63,6 +63,7 @@ typedef struct _DRI2Drawable {
int bufferCount;
unsigned int swapsPending;
ClientPtr blockedClient;
Bool blockedOnMsc;
int swap_interval;
CARD64 swap_count;
int64_t target_sbc; /* -1 means no SBC wait outstanding */
@ -145,6 +146,7 @@ DRI2CreateDrawable(DrawablePtr pDraw)
pPriv->bufferCount = 0;
pPriv->swapsPending = 0;
pPriv->blockedClient = NULL;
pPriv->blockedOnMsc = FALSE;
pPriv->swap_count = 0;
pPriv->target_sbc = -1;
pPriv->swap_interval = 1;
@ -402,6 +404,15 @@ DRI2ThrottleClient(ClientPtr client, DrawablePtr pDraw)
return FALSE;
}
static void
__DRI2BlockClient(ClientPtr client, DRI2DrawablePtr pPriv)
{
if (pPriv->blockedClient == NULL) {
IgnoreClient(client);
pPriv->blockedClient = client;
}
}
void
DRI2BlockClient(ClientPtr client, DrawablePtr pDraw)
{
@ -411,10 +422,8 @@ DRI2BlockClient(ClientPtr client, DrawablePtr pDraw)
if (pPriv == NULL)
return;
if (pPriv->blockedClient == NULL) {
IgnoreClient(client);
pPriv->blockedClient = client;
}
__DRI2BlockClient(client, pPriv);
pPriv->blockedOnMsc = TRUE;
}
int
@ -495,6 +504,7 @@ DRI2WaitMSCComplete(ClientPtr client, DrawablePtr pDraw, int frame,
AttendClient(pPriv->blockedClient);
pPriv->blockedClient = NULL;
pPriv->blockedOnMsc = FALSE;
/* If there's still a swap pending, let DRI2SwapComplete free it */
if (pPriv->refCount == 0 && pPriv->swapsPending == 0)
@ -516,8 +526,12 @@ DRI2WakeClient(ClientPtr client, DrawablePtr pDraw, int frame,
}
/*
* Swap completed. Either wake up an SBC waiter or a client that was
* blocked due to GLX activity during a swap.
* Swap completed.
* Wake the client iff:
* - it was waiting on SBC
* - was blocked due to GLX make current
* - was blocked due to swap throttling
* - is not blocked due to an MSC wait
*/
if (pPriv->target_sbc != -1 &&
pPriv->target_sbc <= pPriv->swap_count) {
@ -527,10 +541,11 @@ DRI2WakeClient(ClientPtr client, DrawablePtr pDraw, int frame,
AttendClient(pPriv->blockedClient);
pPriv->blockedClient = NULL;
} else if (pPriv->target_sbc == -1) {
if (pPriv->blockedClient)
} else if (pPriv->target_sbc == -1 && !pPriv->blockedOnMsc) {
if (pPriv->blockedClient) {
AttendClient(pPriv->blockedClient);
pPriv->blockedClient = NULL;
pPriv->blockedClient = NULL;
}
}
}
@ -582,7 +597,7 @@ DRI2WaitSwap(ClientPtr client, DrawablePtr pDrawable)
pPriv->blockedClient == NULL) {
ResetCurrentRequest(client);
client->sequence--;
DRI2BlockClient(client, pDrawable);
__DRI2BlockClient(client, pPriv);
return TRUE;
}
@ -780,7 +795,7 @@ DRI2WaitSBC(ClientPtr client, DrawablePtr pDraw, CARD64 target_sbc,
}
pPriv->target_sbc = target_sbc;
DRI2BlockClient(client, pDraw);
__DRI2BlockClient(client, pPriv);
return Success;
}

1
hw/xfree86/dri2/dri2.h
View File

@ -257,6 +257,7 @@ extern _X_EXPORT Bool DRI2CanFlip(DrawablePtr pDraw);
extern _X_EXPORT Bool DRI2CanExchange(DrawablePtr pDraw);
/* Note: use *only* for MSC related waits */
extern _X_EXPORT void DRI2BlockClient(ClientPtr client, DrawablePtr pDraw);
extern _X_EXPORT void DRI2SwapComplete(ClientPtr client, DrawablePtr pDraw,