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[host] lgmp: account for frame header capacity

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This commit is contained in:
Geoffrey McRae
2026-08-24 13:01:37 +10:00
parent f664be88bc
commit 9bbccfdcb9
3 changed files with 43 additions and 8 deletions
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34
host/src/app.c
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@@ -98,6 +98,7 @@ struct app
unsigned int pointerShapeIndex;
unsigned alignSize;
size_t frameMemorySize;
size_t maxFrameSize;
PLGMPHostQueue frameQueue;
PLGMPMemory frameMemory[LGMP_Q_FRAME_LEN];
@@ -876,14 +877,37 @@ static bool lgmpSetup(struct IVSHMEM * shmDev)
memset(lgmpHostMemPtr(app.pointerShapeMemory[i]), 0, MAX_POINTER_SIZE);
}
app.maxFrameSize = lgmpHostMemAvail(app.lgmp);
app.maxFrameSize = (app.maxFrameSize - (app.alignSize - 1)) & ~(app.alignSize - 1);
app.maxFrameSize /= LGMP_Q_FRAME_LEN;
DEBUG_INFO("Max Frame Size : %u MiB", (unsigned int)(app.maxFrameSize / 1048576LL));
const size_t frameMemoryAvail = lgmpHostMemAvail(app.lgmp);
if (!app.alignSize ||
(size_t)app.alignSize < sizeof(KVMFRFrame) + sizeof(FrameBuffer) ||
(app.alignSize & (app.alignSize - 1)) ||
frameMemoryAvail <= app.alignSize - 1)
{
DEBUG_ERROR("Invalid framebuffer alignment or shared memory capacity");
goto fail_lgmp;
}
/* Reserve the worst-case alignment padding once, then round each message
* down so all frame allocations are guaranteed to fit. The FrameBuffer data
* begins one alignment unit into each message. */
app.frameMemorySize = (frameMemoryAvail - (app.alignSize - 1)) /
LGMP_Q_FRAME_LEN;
app.frameMemorySize &= ~((size_t)app.alignSize - 1);
if (app.frameMemorySize <= app.alignSize ||
app.frameMemorySize > UINT32_MAX)
{
DEBUG_ERROR("Insufficient shared memory for the frame buffers");
goto fail_lgmp;
}
app.maxFrameSize = app.frameMemorySize - app.alignSize;
DEBUG_INFO("Max Frame Size : %u MiB",
(unsigned int)(app.maxFrameSize / 1048576LL));
for(int i = 0; i < LGMP_Q_FRAME_LEN; ++i)
{
if ((status = lgmpHostMemAllocAligned(app.lgmp, app.maxFrameSize,
if ((status = lgmpHostMemAllocAligned(app.lgmp,
(uint32_t)app.frameMemorySize,
app.alignSize, &app.frameMemory[i])) != LGMP_OK)
{
DEBUG_ERROR("lgmpHostMemAlloc Failed (Frame): %s", lgmpStatusString(status));