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[common] ivshmem: use consistent device numbering on Windows

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We now enumerate all IVSHMEM devices, sort them based on PCI bus, slot,
and function numbers, then index from the resulting order. This should
be consistent across boots.

To help the user identify the correct IVSHMEM device, we also print the
list of IVSHMEM devices on startup.
This commit is contained in:
Quantum
2021-07-28 03:09:24 -04:00
committed by Geoffrey McRae
parent 996b9e7e7b
commit 2ea84cd07e
1 changed files with 85 additions and 8 deletions
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93
common/src/platform/windows/ivshmem.c
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@@ -50,6 +50,26 @@ void ivshmemOptionsInit(void)
option_register(options);
}
struct IVSHMEMData
{
SP_DEVINFO_DATA devInfoData;
DWORD64 busAddr;
};
static int ivshmemComparator(const void * a_, const void * b_)
{
const struct IVSHMEMData * a = a_;
const struct IVSHMEMData * b = b_;
if (a->busAddr < b->busAddr)
return -1;
if (a->busAddr > b->busAddr)
return 1;
return 0;
}
bool ivshmemInit(struct IVSHMEM * dev)
{
assert(dev && !dev->opaque);
@@ -57,22 +77,79 @@ bool ivshmemInit(struct IVSHMEM * dev)
HANDLE handle;
HDEVINFO devInfoSet;
PSP_DEVICE_INTERFACE_DETAIL_DATA infData = NULL;
SP_DEVINFO_DATA devInfoData = {0};
SP_DEVICE_INTERFACE_DATA devInterfaceData = {0};
int deviceAllocated = 1;
int deviceCount = 0;
struct IVSHMEMData * devices = malloc(sizeof(struct IVSHMEMData) * deviceAllocated);
devInfoSet = SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_PRESENT | DIGCF_ALLCLASSES | DIGCF_DEVICEINTERFACE);
devInfoSet = SetupDiGetClassDevs(&GUID_DEVINTERFACE_IVSHMEM, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
devInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
devInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
const int shmDevice = option_get_int("os", "shmDevice");
if (SetupDiEnumDeviceInterfaces(devInfoSet, NULL, &GUID_DEVINTERFACE_IVSHMEM, shmDevice, &devInterfaceData) == FALSE)
if (!devices)
{
DWORD error = GetLastError();
if (error == ERROR_NO_MORE_ITEMS)
DEBUG_ERROR("Failed to allocate memory");
return false;
}
for (; SetupDiEnumDeviceInfo(devInfoSet, deviceCount, &devInfoData); ++deviceCount)
{
if (deviceCount >= deviceAllocated)
{
DEBUG_WINERROR("Unable to enumerate the device, is it attached?", error);
return false;
int newCount = deviceAllocated * 2;
void * new = realloc(devices, newCount * sizeof(struct IVSHMEMData));
if (!new)
{
DEBUG_ERROR("Failed to allocate memory");
break;
}
deviceAllocated = newCount;
devices = new;
}
DEBUG_WINERROR("SetupDiEnumDeviceInterfaces failed", error);
DWORD bus, addr;
if (!SetupDiGetDeviceRegistryProperty(devInfoSet, &devInfoData, SPDRP_BUSNUMBER,
NULL, (void*) &bus, sizeof(bus), NULL))
{
DEBUG_WINERROR("Failed to SetupDiGetDeviceRegistryProperty", GetLastError());
bus = 0xFFFF;
}
if (!SetupDiGetDeviceRegistryProperty(devInfoSet, &devInfoData, SPDRP_ADDRESS,
NULL, (void*) &addr, sizeof(addr), NULL))
{
DEBUG_WINERROR("Failed to SetupDiGetDeviceRegistryProperty", GetLastError());
addr = 0xFFFFFFFF;
}
devices[deviceCount].busAddr = (((DWORD64) bus) << 32) | addr;
memcpy(&devices[deviceCount].devInfoData, &devInfoData, sizeof(SP_DEVINFO_DATA));
}
if (GetLastError() != ERROR_NO_MORE_ITEMS)
{
DEBUG_WINERROR("SetupDiEnumDeviceInfo failed", GetLastError());
return false;
}
const int shmDevice = option_get_int("os", "shmDevice");
qsort(devices, deviceCount, sizeof(struct IVSHMEMData), ivshmemComparator);
for (int i = 0; i < deviceCount; ++i)
{
DWORD bus = devices[i].busAddr >> 32;
DWORD addr = devices[i].busAddr & 0xFFFFFFFF;
DEBUG_INFO("IVSHMEM %d%c on bus 0x%lx, device 0x%lx, function 0x%lx", i,
i == shmDevice ? '*' : ' ', bus, addr >> 16, addr & 0xFFFF);
}
memcpy(&devInfoData, &devices[shmDevice].devInfoData, sizeof(SP_DEVINFO_DATA));
free(devices);
if (SetupDiEnumDeviceInterfaces(devInfoSet, &devInfoData, &GUID_DEVINTERFACE_IVSHMEM, 0, &devInterfaceData) == FALSE)
{
DEBUG_WINERROR("SetupDiEnumDeviceInterfaces failed", GetLastError());
return false;
}