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xfree86: modesetting: use Xace instead of highjacking request handler vector 

Highjacking the ChangeProperty and DeleteProperty vectors is a pretty fragile
and clumpsy way to receive window property updates. Consider eg. multiple
drivers and hotplugging: when they're unplugged in different order than they've
been plugged (and both drivers doing that hack), who knows what happens.

Instead use the hook infrastructure we already have since 1997: Xace.

Listening on property changes that way is pretty simple, doesn't suffer from
the mentioned problems and only takes 1/4 of the code.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
This commit is contained in:
Enrico Weigelt, metux IT consult 2024-06-26 17:21:01 +02:00
parent 290a8b90ee
commit 21d754096b
1 changed files with 24 additions and 112 deletions
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136
hw/xfree86/drivers/modesetting/driver.c
View File

@ -43,6 +43,7 @@
#include <X11/extensions/Xv.h>
#include "dix/dix_priv.h"
#include "Xext/xacestr.h"
#include "xf86.h"
#include "xf86Priv.h"
@ -86,14 +87,10 @@ static Bool ms_pci_probe(DriverPtr driver,
int entity_num, struct pci_device *device,
intptr_t match_data);
static Bool ms_driver_func(ScrnInfoPtr scrn, xorgDriverFuncOp op, void *data);
static void ms_property_access(CallbackListPtr *pcbl, void* unused, void *calldata);
/* window wrapper functions used to get the notification when
* the window property changes */
static Atom vrr_atom;
static Bool property_vectors_wrapped;
static Bool restore_property_vector;
static int (*saved_change_property) (ClientPtr client);
static int (*saved_delete_property) (ClientPtr client);
static int activeScreens = 0;
#ifdef XSERVER_LIBPCIACCESS
static const struct pci_id_match ms_device_match[] = {
@ -918,110 +915,22 @@ ms_vrr_property_update(WindowPtr window, Bool variable_refresh)
ms_present_set_screen_vrr(scrn, variable_refresh);
}
/* Wrapper for xserver/dix/property.c:ProcChangeProperty */
static int
ms_change_property(ClientPtr client)
{
WindowPtr window = NULL;
int ret = 0;
REQUEST(xChangePropertyReq);
client->requestVector[X_ChangeProperty] = saved_change_property;
ret = saved_change_property(client);
if (restore_property_vector)
return ret;
client->requestVector[X_ChangeProperty] = ms_change_property;
if (ret != Success)
return ret;
ret = dixLookupWindow(&window, stuff->window, client, DixSetPropAccess);
if (ret != Success)
return ret;
// Checking for the VRR property change on the window
if (stuff->property == vrr_atom &&
xf86ScreenToScrn(window->drawable.pScreen)->PreInit == PreInit &&
stuff->format == 32 && stuff->nUnits == 1) {
uint32_t *value = (uint32_t *)(stuff + 1);
ms_vrr_property_update(window, *value != 0);
}
return ret;
}
/* Wrapper for xserver/dix/property.c:ProcDeleteProperty */
static int
ms_delete_property(ClientPtr client)
{
WindowPtr window;
int ret;
REQUEST(xDeletePropertyReq);
client->requestVector[X_DeleteProperty] = saved_delete_property;
ret = saved_delete_property(client);
if (restore_property_vector)
return ret;
client->requestVector[X_DeleteProperty] = ms_delete_property;
if (ret != Success)
return ret;
ret = dixLookupWindow(&window, stuff->window, client, DixSetPropAccess);
if (ret != Success)
return ret;
if (stuff->property == vrr_atom &&
xf86ScreenToScrn(window->drawable.pScreen)->PreInit == PreInit)
ms_vrr_property_update(window, FALSE);
return ret;
}
static void
ms_unwrap_property_requests(ScrnInfoPtr scrn)
ms_property_access(CallbackListPtr *pcbl, void* unused, void *calldata)
{
int i;
XacePropertyAccessRec *rec = calldata;
PropertyPtr pProp = *(rec->ppProp);
if (!property_vectors_wrapped)
// our property ? window on screen handled by us ?
if (!(pProp->propertyName == vrr_atom) &&
(xf86ScreenToScrn(rec->pWin->drawable.pScreen)->PreInit == PreInit))
return;
if (ProcVector[X_ChangeProperty] == ms_change_property)
ProcVector[X_ChangeProperty] = saved_change_property;
else
restore_property_vector = TRUE;
if (rec->access_mode & DixDestroyAccess)
ms_vrr_property_update(rec->pWin, FALSE);
if (ProcVector[X_DeleteProperty] == ms_delete_property)
ProcVector[X_DeleteProperty] = saved_delete_property;
else
restore_property_vector = TRUE;
for (i = 0; i < currentMaxClients; i++) {
if (clients[i]->requestVector[X_ChangeProperty] == ms_change_property) {
clients[i]->requestVector[X_ChangeProperty] = saved_change_property;
} else {
restore_property_vector = TRUE;
}
if (clients[i]->requestVector[X_DeleteProperty] == ms_delete_property) {
clients[i]->requestVector[X_DeleteProperty] = saved_delete_property;
} else {
restore_property_vector = TRUE;
}
}
if (restore_property_vector) {
xf86DrvMsg(scrn->scrnIndex, X_WARNING,
"Couldn't unwrap some window property request vectors\n");
}
property_vectors_wrapped = FALSE;
if ((rec->access_mode & DixWriteAccess) && (pProp->format == 32) && (pProp->size == 1))
ms_vrr_property_update(rec->pWin, (*(uint32_t *)(pProp->data)) != 0);
}
static void
@ -1043,7 +952,6 @@ FreeRec(ScrnInfoPtr pScrn)
ms_ent = ms_ent_priv(pScrn);
ms_ent->fd_ref--;
if (!ms_ent->fd_ref) {
ms_unwrap_property_requests(pScrn);
if (ms->pEnt->location.type == BUS_PCI)
ret = drmClose(ms->fd);
else
@ -2194,17 +2102,15 @@ ScreenInit(ScreenPtr pScreen, int argc, char **argv)
pScrn->vtSema = TRUE;
if (ms->vrr_support) {
if (!property_vectors_wrapped) {
saved_change_property = ProcVector[X_ChangeProperty];
ProcVector[X_ChangeProperty] = ms_change_property;
saved_delete_property = ProcVector[X_DeleteProperty];
ProcVector[X_DeleteProperty] = ms_delete_property;
property_vectors_wrapped = TRUE;
}
vrr_atom = MakeAtom("_VARIABLE_REFRESH",
strlen("_VARIABLE_REFRESH"), TRUE);
}
/* first one: register Xace hook for Window property updates */
if (!activeScreens)
XaceRegisterCallback(XACE_PROPERTY_ACCESS, ms_property_access, NULL);
activeScreens++;
return TRUE;
}
@ -2289,6 +2195,12 @@ CloseScreen(ScreenPtr pScreen)
modesettingPtr ms = modesettingPTR(pScrn);
modesettingEntPtr ms_ent = ms_ent_priv(pScrn);
activeScreens--;
if (activeScreens < 1) {
XaceDeleteCallback(XACE_PROPERTY_ACCESS, ms_property_access, NULL);
activeScreens = 0;
}
/* Clear mask of assigned crtc's in this generation */
ms_ent->assigned_crtcs = 0;