[Spice-devel] [PATCH linux vdagent 01/10] Add lookup_xrand_output_for_device_info()
Lukáš Hrázký
lhrazky at redhat.com
Tue Dec 18 16:27:47 UTC 2018
Hi,
sorry about piecemealing this.
On Thu, 2018-12-13 at 16:46 -0600, Jonathon Jongsma wrote:
> Add a function to look up an xrandr output for a given device display
> id. This uses sysfs and the drm subsystem to lookup information about a
> graphics device output. It then compares the drm output name to xrandr
> output names to try to match that device output to an xrandr output.
> This is necesary for guests that have multiple graphics devices.
> ---
> Makefile.am | 14 ++
> configure.ac | 1 +
> src/vdagent/device-info.c | 516 ++++++++++++++++++++++++++++++++++++++
> src/vdagent/device-info.h | 26 ++
> tests/test-device-info.c | 262 +++++++++++++++++++
> 5 files changed, 819 insertions(+)
> create mode 100644 src/vdagent/device-info.c
> create mode 100644 src/vdagent/device-info.h
> create mode 100644 tests/test-device-info.c
>
> diff --git a/Makefile.am b/Makefile.am
> index 3e405bc..d2f2258 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -12,6 +12,7 @@ common_sources = \
> $(NULL)
>
> src_spice_vdagent_CFLAGS = \
> + $(DRM_CFLAGS) \
> $(X_CFLAGS) \
> $(SPICE_CFLAGS) \
> $(GLIB2_CFLAGS) \
> @@ -22,6 +23,7 @@ src_spice_vdagent_CFLAGS = \
> $(NULL)
>
> src_spice_vdagent_LDADD = \
> + $(DRM_LIBS) \
> $(X_LIBS) \
> $(SPICE_LIBS) \
> $(GLIB2_LIBS) \
> @@ -35,6 +37,8 @@ src_spice_vdagent_SOURCES = \
> src/vdagent/audio.h \
> src/vdagent/clipboard.c \
> src/vdagent/clipboard.h \
> + src/vdagent/device-info.c \
> + src/vdagent/device-info.h \
> src/vdagent/file-xfers.c \
> src/vdagent/file-xfers.h \
> src/vdagent/x11-priv.h \
> @@ -137,3 +141,13 @@ EXTRA_DIST = \
> DISTCHECK_CONFIGURE_FLAGS = \
> --with-init-script=redhat \
> $(NULL)
> +
> +tests_test_device_info_LDADD = $(src_spice_vdagent_LDADD)
> +tests_test_device_info_CFLAGS = $(src_spice_vdagent_CFLAGS)
> +
> +check_PROGRAMS = \
> + tests/test-device-info \
> + $(NULL)
> +
> +TESTS = $(check_PROGRAMS)
> +
> diff --git a/configure.ac b/configure.ac
> index 7cb44db..55b031e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -105,6 +105,7 @@ PKG_CHECK_MODULES(X, [xfixes xrandr >= 1.3 xinerama x11])
> PKG_CHECK_MODULES(SPICE, [spice-protocol >= 0.12.13])
> PKG_CHECK_MODULES(ALSA, [alsa >= 1.0.22])
> PKG_CHECK_MODULES([DBUS], [dbus-1])
> +PKG_CHECK_MODULES([DRM], [libdrm])
>
> if test "$with_session_info" = "auto" || test "$with_session_info" = "systemd"; then
> PKG_CHECK_MODULES([LIBSYSTEMD_LOGIN],
> diff --git a/src/vdagent/device-info.c b/src/vdagent/device-info.c
> new file mode 100644
> index 0000000..c519741
> --- /dev/null
> +++ b/src/vdagent/device-info.c
> @@ -0,0 +1,516 @@
> +/* device-info.c utility function for looking up the xrandr output id for a
> + * given device address and display id
> + *
> + * Copyright 2018 Red Hat, Inc.
> + *
> + * Red Hat Authors:
> + * Jonathon Jongsma <jjongsma at redhat.com>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 3 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <assert.h>
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/stat.h>
> +#include <syslog.h>
> +#include <xf86drm.h>
> +#include <xf86drmMode.h>
> +#include <unistd.h>
> +#include <X11/extensions/Xrandr.h>
> +#include <glib.h>
> +
> +#include "device-info.h"
> +
> +typedef struct PciDevice {
> + int domain;
> + uint8_t bus;
> + uint8_t slot;
> + uint8_t function;
> +} PciDevice;
> +
> +typedef struct PciAddress {
> + int domain;
> + GList *devices; /* PciDevice */
> +} PciAddress;
> +
> +static PciAddress* pci_address_new()
> +{
> + return g_new0(PciAddress, 1);
> +}
> +
> +static void pci_address_free(PciAddress *addr)
> +{
> + g_list_free_full(addr->devices, g_free);
> + g_free(addr);
> +}
> +
> +
> +static int read_next_hex_number(const char *input, char delim, char **endptr)
> +{
> + assert(input != NULL);
> + assert(endptr != NULL);
> +
> + const char *pos = strchr(input, delim);
> + int n;
> + if (!pos) {
> + *endptr = NULL;
> + return 0;
> + }
> +
> + char *endpos;
> + n = strtol(input, &endpos, 16);
> +
> + // check if we read all characters until the delimiter
> + if (endpos != pos)
> + endpos = NULL;
> +
> + *endptr = endpos;
> + return n;
> +}
> +
> +// the device should be specified in BDF notation (e.g. 0000:00:02.0)
> +// see https://wiki.xen.org/wiki/Bus:Device.Function_(BDF)_Notation
> +static bool parse_pci_device(const char *bdf, const char *end, PciDevice *device)
> +{
> + if (!end) end = strchr(bdf, 0);
> +
> + int endpos = -1;
> + int domain, bus, slot, function;
> + sscanf(bdf, "%x:%x:%x.%x%n", &domain, &bus, &slot, &function, &endpos);
> + if (!device || endpos < 0 || bdf + endpos != end)
> + return false;
> + if (domain < 0 || bus < 0 || slot < 0 || function < 0)
> + return false;
> +
> + device->domain = domain;
> + device->bus = bus;
> + device->slot = slot;
> + device->function = function;
> + return true;
> +}
> +
> +// We need to extract the pci address of the device from the sysfs entry for the device like so:
> +// $ readlink /sys/class/drm/card0
> +// This should give you a path such as this for cards on the root bus:
> +// /sys/devices/pci0000:00/0000:00:02.0/drm/card0
> +// or something like this if there is a pci bridge:
> +// /sys/devices/pci0000:00/0000:00:03.0/0000:01:01.0/0000:02:03.0/virtio2/drm/card0
> +static PciAddress* parse_pci_address_from_sysfs_path(const char* addr)
> +{
> + char *pos = strstr(addr, "/pci");
> + if (!pos)
> + return NULL;
> +
> + // advance to the numbers in pci0000:00
> + pos += 4;
> + int domain = read_next_hex_number(pos, ':', &pos);
> + if (!pos) {
> + return NULL;
> + }
> +
> + // not used right now.
> + G_GNUC_UNUSED uint8_t bus = read_next_hex_number(pos + 1, '/', &pos);
> + if (!pos) {
> + return NULL;
> + }
> +
> + PciAddress *address = pci_address_new();
> + address->domain = domain;
> + // now read all of the devices
> + while (pos) {
> + PciDevice *dev = g_new0(PciDevice, 1);
> + char *next = strchr(pos + 1, '/');
> + if (!parse_pci_device(pos + 1, next, dev)) {
> + g_free(dev);
> + break;
> + }
> + address->devices = g_list_append(address->devices, dev);
> + pos = next;
> + }
> + return address;
> +}
> +
> +// format should be something like pci/$domain/$slot.$fn/$slot.$fn
> +static PciAddress* parse_pci_address_from_spice(char *input)
> +{
> + static const char prefix[] = "pci/";
> + if (strncmp(input, prefix, strlen(prefix)) != 0)
> + return NULL;
> +
> + char *pos = input + strlen(prefix);
> + int domain = read_next_hex_number(pos, '/', &pos);
> + if (!pos) {
> + return NULL;
> + }
> +
> + PciAddress *address = pci_address_new();
> + address->domain = domain;
> + // now read all of the devices
> + for (int n = 0; ; n++) {
> + PciDevice *dev = g_new0(PciDevice, 1);
> + char *next = strchr(pos + 1, '/');
> +
> + dev->slot = read_next_hex_number(pos + 1, '.', &pos);
> + if (!pos) {
> + g_free(dev);
> + break;
> + }
> +
> + dev->function = strtol(pos + 1, &pos, 16);
> + if (!pos || (next != NULL && next != pos)) {
> + g_free(dev);
> + break;
> + }
> +
> + address->devices = g_list_append(address->devices, dev);
> + pos = next;
> + if (!pos)
> + break;
> + }
> + return address;
> +}
> +
> +static bool compare_addresses(PciAddress *a, PciAddress *b)
> +{
> + // only check domain, slot, and function
> + if (!(a->domain == b->domain
> + && g_list_length(a->devices) == g_list_length(b->devices))) {
> + return false;
> + }
> +
> + for (GList *la = a->devices, *lb = b->devices;
> + la != NULL;
> + la = la->next, lb = lb->next) {
> + PciDevice *deva = la->data;
> + PciDevice *devb = lb->data;
> +
> + if (deva->slot != devb->slot
> + || deva->function != devb->function) {
> + return false;
> + }
> + }
> + return true;
> +}
> +
> +// Connector type names from xorg modesetting driver
> +static const char * const modesetting_output_names[] = {
> + [DRM_MODE_CONNECTOR_Unknown] = "None" ,
> + [DRM_MODE_CONNECTOR_VGA] = "VGA" ,
> + [DRM_MODE_CONNECTOR_DVII] = "DVI-I" ,
> + [DRM_MODE_CONNECTOR_DVID] = "DVI-D" ,
> + [DRM_MODE_CONNECTOR_DVIA] = "DVI-A" ,
> + [DRM_MODE_CONNECTOR_Composite] = "Composite" ,
> + [DRM_MODE_CONNECTOR_SVIDEO] = "SVIDEO" ,
> + [DRM_MODE_CONNECTOR_LVDS] = "LVDS" ,
> + [DRM_MODE_CONNECTOR_Component] = "Component" ,
> + [DRM_MODE_CONNECTOR_9PinDIN] = "DIN" ,
> + [DRM_MODE_CONNECTOR_DisplayPort] = "DP" ,
> + [DRM_MODE_CONNECTOR_HDMIA] = "HDMI" ,
> + [DRM_MODE_CONNECTOR_HDMIB] = "HDMI-B" ,
> + [DRM_MODE_CONNECTOR_TV] = "TV" ,
> + [DRM_MODE_CONNECTOR_eDP] = "eDP" ,
> + [DRM_MODE_CONNECTOR_VIRTUAL] = "Virtual" ,
> + [DRM_MODE_CONNECTOR_DSI] = "DSI" ,
> + [DRM_MODE_CONNECTOR_DPI] = "DPI" ,
> +};
> +// Connector type names from qxl driver
> +static const char * const qxl_output_names[] = {
> + [DRM_MODE_CONNECTOR_Unknown] = "None" ,
> + [DRM_MODE_CONNECTOR_VGA] = "VGA" ,
> + [DRM_MODE_CONNECTOR_DVII] = "DVI" ,
> + [DRM_MODE_CONNECTOR_DVID] = "DVI" ,
> + [DRM_MODE_CONNECTOR_DVIA] = "DVI" ,
> + [DRM_MODE_CONNECTOR_Composite] = "Composite" ,
> + [DRM_MODE_CONNECTOR_SVIDEO] = "S-video" ,
> + [DRM_MODE_CONNECTOR_LVDS] = "LVDS" ,
> + [DRM_MODE_CONNECTOR_Component] = "CTV" ,
> + [DRM_MODE_CONNECTOR_9PinDIN] = "DIN" ,
> + [DRM_MODE_CONNECTOR_DisplayPort] = "DisplayPort" ,
> + [DRM_MODE_CONNECTOR_HDMIA] = "HDMI" ,
> + [DRM_MODE_CONNECTOR_HDMIB] = "HDMI" ,
> + [DRM_MODE_CONNECTOR_TV] = "TV" ,
> + [DRM_MODE_CONNECTOR_eDP] = "eDP" ,
> + [DRM_MODE_CONNECTOR_VIRTUAL] = "Virtual" ,
> +};
> +
> +
> +static void drm_conn_name_full(drmModeConnector *conn, const char * const *names, int nnames, char *dest, size_t dlen, bool decrement_id)
> +{
> + const char *type;
> +
> + if (conn->connector_type_id < nnames &&
I think this part of the condition should read:
if (conn->connector_type < nnames &&
> + names[conn->connector_type]) {
> + type = names[conn->connector_type];
> + } else {
> + type = "unknown";
> + }
> +
> + uint8_t id = conn->connector_type_id;
> + if (decrement_id) {
> + id--;
> + }
> + snprintf(dest, dlen, "%s-%d", type, id);
> +}
> +
> +static void drm_conn_name_qxl(drmModeConnector *conn, char *dest, size_t dlen, bool decrement_id)
> +{
> + return drm_conn_name_full(conn, qxl_output_names,
> + sizeof(qxl_output_names)/sizeof(qxl_output_names[0]),
> + dest, dlen, decrement_id);
> +}
> +
> +// FIXME: there are some cases (for example, in my Lenovo T460p laptop with
> +// intel graphics) where the modesetting driver uses a name such as DP-3-1
> +// instead of DP-4. These outputs are not likely to be common in virtual
> +// machines, so it may not matter much (?)
> +static void drm_conn_name_modesetting(drmModeConnector *conn, char *dest, size_t dlen)
> +{
> + return drm_conn_name_full(conn, modesetting_output_names,
> + sizeof(modesetting_output_names)/sizeof(modesetting_output_names[0]),
> + dest, dlen, false);
> +}
> +
> +static const char *const connections[] = {"", "*CONNECTED*", "disconnected", "unknown connection"};
> +
> +#define PCI_VENDOR_ID_REDHAT 0x1b36
> +#define PCI_VENDOR_ID_REDHAT_QUMRANET 0x1af4 // virtio-gpu
> +#define PCI_VENDOR_ID_INTEL 0x8086
> +#define PCI_VENDOR_ID_NVIDIA 0x10de
> +
> +#define PCI_DEVICE_ID_QXL 0x0100
> +#define PCI_DEVICE_ID_VIRTIO_GPU 0x1050
> +
> +static bool read_hex_value_from_file(const char *path, int* value)
> +{
> + if (value == NULL || path == NULL)
> + return false;
> +
> + FILE *f = fopen(path, "r");
> + if (f == NULL)
> + return false;
> +
> + int endpos = -1;
> + bool result = (fscanf(f, "%x\n%n", value, &endpos) > 0 && endpos >= 0);
> +
> + fclose(f);
> + return result;
> +}
> +
> + // PCI address should be in the following format:
> + // pci/$domain/$slot.$fn/$slot.$fn
> +bool lookup_xrandr_output_for_device_info(VDAgentGraphicsDeviceInfo *device_info, RROutput *output_id)
> +{
It would actually be nice to further split the content of this function
into smaller ones, e.g. translating the pci address, doing the drm
stuff etc.
> + bool found_device = false;
> + XRRScreenResources *xres = NULL;
> + Display *xdisplay = NULL;
> + PciAddress *user_pci_addr = parse_pci_address_from_spice((char*)device_info->device_address);
> + if (!user_pci_addr) {
> + syslog(LOG_WARNING, "Couldn't parse PCI address '%s'. Address should be the form 'pci/$domain/$slot.$fn/$slot.fn...", device_info->device_address);
> + goto cleanup;
> + }
> + // look up xrandr outputs
> + xdisplay = XOpenDisplay(NULL);
> + if (!xdisplay) {
> + syslog(LOG_WARNING, "Failed to open X dislay");
> + goto cleanup;
> + }
> +
> + int rr_event_base, rr_error_base;
> + if (!XRRQueryExtension(xdisplay, &rr_event_base, &rr_error_base)) {
> + syslog(LOG_WARNING, "Failed to initialize XRandr extension");
> + goto cleanup;
> + }
> +
> + xres = XRRGetScreenResourcesCurrent(xdisplay, DefaultRootWindow(xdisplay));
> + if (!xres) {
> + syslog(LOG_WARNING, "Unable to get Xorg screen resources");
> + goto cleanup;
> + }
> +
> + // Look for a device that matches the PCI address parsed above. Loop
> + // through the list of cards reported by the DRM subsytem
> + for (int i = 0; i < 10; ++i) {
> + char dev_path[64];
> + struct stat buf;
> +
> + // device node for the card is needed to access libdrm functionality
> + snprintf(dev_path, sizeof(dev_path), DRM_DEV_NAME, DRM_DIR_NAME, i);
> + if (stat(dev_path, &buf) != 0) {
> + // no card exists, exit loop
> + syslog(LOG_DEBUG, "No card %i exists\n", i);
> + break;
> + }
> +
> + // the sysfs directory for the card will allow us to determine the
> + // pci address for the device
> + char sys_path[64];
> + snprintf(sys_path, sizeof(sys_path), "/sys/class/drm/card%d", i);
> + syslog(LOG_DEBUG, "sys path: %s\n", sys_path);
> +
> + // the file /sys/class/drm/card0 is a symlink to a file that
> + // specifies the device's address. It usually points to something
> + // like /sys/devices/pci0000:00/0000:00:02.0/drm/card0
> + char device_link[PATH_MAX];
> + if (realpath(sys_path, device_link) == NULL) {
> + syslog(LOG_WARNING, "Failed to get the real path of %s", sys_path);
> + goto cleanup;
> + }
> + syslog(LOG_DEBUG, "Device %s is at %s\n", dev_path, device_link);
> +
> + PciAddress *drm_pci_addr = parse_pci_address_from_sysfs_path(device_link);
> + if (!drm_pci_addr) {
> + syslog(LOG_DEBUG, "Can't determine pci address from '%s'", device_link);
> + continue;
> + }
> +
> + if (!compare_addresses(user_pci_addr, drm_pci_addr)) {
> + pci_address_free(drm_pci_addr);
> + syslog(LOG_DEBUG, "card addr '%s' does not match requested addr '%s'\n", device_link, device_info->device_address);
> + continue;
> + }
> + pci_address_free(drm_pci_addr);
> +
> + bool found_output = false;
> + char id_path[150];
> + snprintf(id_path, sizeof(id_path), "%s/device/vendor", sys_path);
> + int vendor_id = 0;
> + if (!read_hex_value_from_file(id_path, &vendor_id)) {
> + syslog(LOG_WARNING, "Unable to read vendor ID of card\n");
> + } else {
> + syslog(LOG_DEBUG, "Vendor id of this card is %#x\n", vendor_id);
> + }
> + snprintf(id_path, sizeof(id_path), "%s/device/device", sys_path);
> + int device_id = 0;
> + if (!read_hex_value_from_file(id_path, &device_id)) {
> + syslog(LOG_WARNING, "Unable to read device ID of card\n");
> + } else {
> + syslog(LOG_DEBUG, "Device id of this card is %#x\n", device_id);
> + }
> +
> + int drm_fd = open(dev_path, O_RDWR);
> + if (drm_fd < 0) {
> + syslog(LOG_WARNING, "Unable to open file %s", dev_path);
> + goto cleanup;
> + }
> +
> + drmModeResPtr res = drmModeGetResources(drm_fd);
> + if (res) {
> + // find the drm output that is equal to device_display_id
> + if (device_info->device_display_id >= res->count_connectors) {
> + syslog(LOG_WARNING, "Specified display id %i is higher than the maximum display id provided by this device (%i)",
> + device_info->device_display_id, res->count_connectors - 1);
> + goto cleanup;
> + }
> +
> + drmModeConnectorPtr conn = drmModeGetConnector(drm_fd, res->connectors[device_info->device_display_id]);
drmModeGetConnector can return NULL in case of an error, better check
it.
> + drmModeFreeResources(res);
> + res = NULL;
> +
> + bool decrement_name = false;
> + if (vendor_id == PCI_VENDOR_ID_REDHAT && device_id == PCI_DEVICE_ID_QXL) {
> + // Older QXL drivers numbered their outputs starting with
> + // 0. This contrasts with most drivers who start numbering
> + // outputs with 1. In this case, the expected drm connector
> + // name will need to be decremented before comparing to the
> + // xrandr output name
> + for (int i = 0; i < xres->noutput; ++i) {
> + XRROutputInfo *oinfo = XRRGetOutputInfo(xdisplay, xres, xres->outputs[i]);
> + // the QXL device doesn't use the drm names directly, but
> + // starts numbering from 0 instead of 1, so we need to
> + // detect this condition and add 1 to all output names in
> + // this scenario before comparing
> + // check if one output is named "Virtual-0"
> + if (strcmp(oinfo->name, "Virtual-0") == 0) {
In case of Virtual-X output names on a different card than the one used
with X, this check may fail. Though maybe that's an unsupported use
case? Maybe a more reliable way would be to check for a file matching
/sys/class/drm/card*-Virtual-0?
> + syslog(LOG_DEBUG, "Need to decrement connector name...\n");
> + decrement_name = true;
> + XRRFreeOutputInfo(oinfo);
> + break;
> + }
> + XRRFreeOutputInfo(oinfo);
> + }
> + }
> + // Compare the name of the xrandr output against what we would
> + // expect based on the drm connection type. The xrandr names
> + // are driver-specific, so we need to special-case some
> + // drivers. Most hardware these days uses the 'modesetting'
> + // driver, but the QXL device uses its own driver which has
> + // different naming conventions
> + char expected_name[100];
> + if (vendor_id == PCI_VENDOR_ID_REDHAT && device_id == PCI_DEVICE_ID_QXL) {
> + drm_conn_name_qxl(conn, expected_name, sizeof(expected_name), decrement_name);
> + } else {
> + drm_conn_name_modesetting(conn, expected_name, sizeof(expected_name));
> + }
> +
> + // Loop through xrandr outputs and check whether the xrandr
> + // output name matches the drm connector name
> + for (int i = 0; i < xres->noutput; ++i) {
> + int oid = xres->outputs[i];
> + XRROutputInfo *oinfo = XRRGetOutputInfo(xdisplay, xres, oid);
> +
> + syslog(LOG_DEBUG, "Checking whether xrandr output %i (%s) matches expected name %s\n", i, oinfo->name, expected_name);
> + if (strcmp(oinfo->name, expected_name) == 0) {
> + *output_id = oid;
> + found_output = true;
> + printf(" Found matching X Output: name=%s id=%i (%s)\n",
> + oinfo->name,
> + (int)oid,
> + connections[oinfo->connection + 1]);
> + XRRFreeOutputInfo(oinfo);
> + break;
> + }
> + XRRFreeOutputInfo(oinfo);
> + }
> + drmModeFreeConnector(conn);
> + conn = NULL;
No need to NULL the pointer.
Cheers,
Lukas
> + } else {
> + syslog(LOG_WARNING, "Unable to get DRM resources for card");
> + // This is probably a proprietary driver (e.g. Nvidia) that does
> + // not provide outputs via drm, so the only thing we can do is just
> + // assume that it is the only device assigned to X, and use the
> + // xrandr output order to determine the proper display.
> + if (device_info->device_display_id >= xres->noutput) {
> + syslog(LOG_WARNING, "The device display id %i does not exist", device_info->device_display_id);
> + goto cleanup;
> + }
> + *output_id = xres->outputs[device_info->device_display_id];
> + found_output = true;
> + }
> + close(drm_fd);
> +
> + if (!found_output) {
> + syslog(LOG_WARNING, "Couldn't find an XRandr output for the specified device");
> + goto cleanup;
> + }
> +
> + // we found the right card, abort the loop
> + found_device = true;
> + break;
> + }
> +
> +cleanup:
> + if (xres) {
> + XRRFreeScreenResources(xres);
> + }
> + if (xdisplay) {
> + XCloseDisplay(xdisplay);
> + }
> + if (user_pci_addr) {
> + pci_address_free(user_pci_addr);
> + }
> + return found_device;
> +}
> diff --git a/src/vdagent/device-info.h b/src/vdagent/device-info.h
> new file mode 100644
> index 0000000..ec3ca32
> --- /dev/null
> +++ b/src/vdagent/device-info.h
> @@ -0,0 +1,26 @@
> +/* device-info.c utility function for looking up the xrandr output id for a
> + * given device address and display id
> + *
> + * Copyright 2018 Red Hat, Inc.
> + *
> + * Red Hat Authors:
> + * Jonathon Jongsma <jjongsma at redhat.com>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 3 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +#include <spice/vd_agent.h>
> +#include <X11/extensions/Xrandr.h>
> +#include <stdbool.h>
> +
> +bool lookup_xrandr_output_for_device_info(VDAgentGraphicsDeviceInfo *device_info, RROutput *output_id);
> diff --git a/tests/test-device-info.c b/tests/test-device-info.c
> new file mode 100644
> index 0000000..5964313
> --- /dev/null
> +++ b/tests/test-device-info.c
> @@ -0,0 +1,262 @@
> +/* test-device-info.c tests to see whether the functionality for converting a
> + * device address to a xrandr output are working properly
> + *
> + * Copyright 2018 Red Hat, Inc.
> + *
> + * Red Hat Authors:
> + * Jonathon Jongsma <jjongsma at redhat.com>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 3 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +// just include the source file for testing
> +#include "vdagent/device-info.c"
> +
> +#define assert_device(dev, domain_, bus_, slot_, function_) \
> +{ \
> + PciDevice* dev_ = (dev); \
> + assert(dev_ != NULL); \
> + assert(dev_->domain == domain_); \
> + assert(dev_->bus == bus_); \
> + assert(dev_->slot == slot_); \
> + assert(dev_->function == function_); \
> +}
> +
> +static void test_compare_addresses()
> +{
> + {
> + PciDevice da1 = {1, 0, 3, 0};
> + PciDevice da2 = {1, 1, 1, 0};
> + PciDevice da3 = {1, 2, 3, 0};
> + PciAddress a1 = {1, NULL};
> + a1.domain = 0;
> + a1.devices = g_list_append(a1.devices, &da1);
> + a1.devices = g_list_append(a1.devices, &da2);
> + a1.devices = g_list_append(a1.devices, &da3);
> +
> + PciDevice db1 = {1, 0, 3, 0};
> + PciDevice db2 = {1, 1, 1, 0};
> + PciDevice db3 = {1, 2, 3, 0};
> + PciAddress a2 = {1, NULL};
> + a2.domain = 0;
> + a2.devices = g_list_append(a2.devices, &db1);
> + a2.devices = g_list_append(a2.devices, &db2);
> + a2.devices = g_list_append(a2.devices, &db3);
> +
> + assert(compare_addresses(&a1, &a2));
> + }
> + {
> + PciDevice da1 = {1, 0, 3, 0};
> + PciDevice da2 = {1, 1, 1, 0};
> + PciDevice da3 = {1, 2, 3, 0};
> + PciAddress a1 = {1, NULL};
> + a1.domain = 0;
> + a1.devices = g_list_append(a1.devices, &da1);
> + a1.devices = g_list_append(a1.devices, &da2);
> + a1.devices = g_list_append(a1.devices, &da3);
> +
> + // a 'spice' format PCI address will not provide domain or bus for each
> + // device, only slot and function. So first two numbers for each device
> + // will always be set to 0
> + PciDevice db1 = {0, 0, 3, 0};
> + PciDevice db2 = {0, 0, 1, 0};
> + PciDevice db3 = {0, 0, 3, 0};
> + PciAddress a2 = {1, NULL};
> + a2.domain = 0;
> + a2.devices = g_list_append(a2.devices, &db1);
> + a2.devices = g_list_append(a2.devices, &db2);
> + a2.devices = g_list_append(a2.devices, &db3);
> +
> + assert(compare_addresses(&a1, &a2));
> + }
> + // different number of devices
> + {
> + PciDevice da1 = {0, 0, 3, 0};
> + PciDevice da2 = {0, 1, 1, 0};
> + PciDevice da3 = {0, 2, 3, 0};
> + PciAddress a1 = {0, NULL};
> + a1.domain = 0;
> + a1.devices = g_list_append(a1.devices, &da1);
> + a1.devices = g_list_append(a1.devices, &da2);
> + a1.devices = g_list_append(a1.devices, &da3);
> +
> + PciDevice db1 = {0, 0, 3, 0};
> + PciDevice db2 = {0, 1, 1, 0};
> + PciAddress a2 = {0, NULL};
> + a2.domain = 0;
> + a2.devices = g_list_append(a2.devices, &db1);
> + a2.devices = g_list_append(a2.devices, &db2);
> +
> + assert(!compare_addresses(&a1, &a2));
> + }
> + // mismatched function
> + {
> + PciDevice da1 = {0, 0, 2, 0};
> + PciAddress a1 = {0, NULL};
> + a1.domain = 0;
> + a1.devices = g_list_append(a1.devices, &da1);
> +
> + PciDevice db1 = {0, 0, 2, 1};
> + PciAddress a2 = {0, NULL};
> + a2.domain = 0;
> + a2.devices = g_list_append(a2.devices, &db1);
> +
> + assert(!compare_addresses(&a1, &a2));
> + }
> + // mismatched slot
> + {
> + PciDevice da1 = {0, 0, 2, 0};
> + PciAddress a1 = {0, NULL};
> + a1.domain = 0;
> + a1.devices = g_list_append(a1.devices, &da1);
> +
> + PciDevice db1 = {0, 0, 1, 0};
> + PciAddress a2 = {0, NULL};
> + a2.domain = 0;
> + a2.devices = g_list_append(a2.devices, &db1);
> +
> + assert(!compare_addresses(&a1, &a2));
> + }
> + // mismatched domain
> + {
> + PciDevice da1 = {0, 0, 2, 0};
> + PciAddress a1 = {0, NULL};
> + a1.domain = 1;
> + a1.devices = g_list_append(a1.devices, &da1);
> +
> + PciDevice db1 = {0, 0, 2, 0};
> + PciAddress a2 = {0, NULL};
> + a2.domain = 0;
> + a2.devices = g_list_append(a2.devices, &db1);
> +
> + assert(!compare_addresses(&a1, &a2));
> + }
> +}
> +
> +static void test_spice_parsing()
> +{
> + PciAddress *addr = parse_pci_address_from_spice("pci/0000/02.0");
> + assert(addr != NULL);
> + assert(addr->domain == 0);
> + assert(g_list_length(addr->devices) == 1);
> + assert_device(addr->devices->data, 0, 0, 2, 0);
> + pci_address_free(addr);
> +
> + addr = parse_pci_address_from_spice("pci/ffff/ff.f");
> + assert(addr != NULL);
> + assert(addr->domain == 65535);
> + assert(g_list_length(addr->devices) == 1);
> + assert_device(addr->devices->data, 0, 0, 255, 15);
> + pci_address_free(addr);
> +
> + addr = parse_pci_address_from_spice("pci/0000/02.1/03.0");
> + assert(addr != NULL);
> + assert(addr->domain == 0);
> + assert(g_list_length(addr->devices) == 2);
> + assert_device(addr->devices->data, 0, 0, 2, 1);
> + assert_device(addr->devices->next->data, 0, 0, 3, 0);
> + pci_address_free(addr);
> +
> + addr = parse_pci_address_from_spice("pci/000a/01.0/02.1/03.0");
> + assert(addr != NULL);
> + assert(addr->domain == 10);
> + assert(g_list_length(addr->devices) == 3);
> + assert_device(addr->devices->data, 0, 0, 1, 0);
> + assert_device(addr->devices->next->data, 0, 0, 2, 1);
> + assert_device(addr->devices->next->next->data, 0, 0, 3, 0);
> + pci_address_free(addr);
> +
> + addr = parse_pci_address_from_spice("pcx/0000/02.1/03.0");
> + assert(addr == NULL);
> +
> + addr = parse_pci_address_from_spice("0000/02.0");
> + assert(addr == NULL);
> +
> + addr = parse_pci_address_from_spice("0000/02.1/03.0");
> + assert(addr == NULL);
> +}
> +
> +static void test_sysfs_parsing()
> +{
> + PciAddress *addr = parse_pci_address_from_sysfs_path("../../devices/pci0000:00/0000:00:02.0/drm/card0");
> + assert(addr != NULL);
> + assert(addr->domain == 0);
> + assert(g_list_length(addr->devices) == 1);
> + assert_device(addr->devices->data, 0, 0, 2, 0);
> + pci_address_free(addr);
> +
> + addr = parse_pci_address_from_sysfs_path("../../devices/pciffff:ff/ffff:ff:ff.f/drm/card0");
> + assert(addr != NULL);
> + assert(addr->domain == 65535);
> + assert(g_list_length(addr->devices) == 1);
> + assert_device(addr->devices->data, 65535, 255, 255, 15);
> + pci_address_free(addr);
> +
> + addr = parse_pci_address_from_sysfs_path("../../devices/pci0000:00/0000:00:03.0/0000:01:01.0/0000:02:03.0/virtio2/drm/card0");
> + assert(addr != NULL);
> + assert(addr->domain == 0);
> + assert(g_list_length(addr->devices) == 3);
> + assert_device(addr->devices->data, 0, 0, 3, 0);
> + assert_device(addr->devices->next->data, 0, 1, 1, 0);
> + assert_device(addr->devices->next->next->data, 0, 2, 3, 0);
> + pci_address_free(addr);
> +}
> +
> +// verify that we parse the BDF notation correctly
> +static bool test_bdf(const char* string, int domain, uint8_t bus, uint8_t slot, uint8_t function)
> +{
> + PciDevice pci_dev;
> + return (parse_pci_device(string, NULL, &pci_dev)
> + && (pci_dev.domain == domain)
> + && (pci_dev.bus == bus)
> + && (pci_dev.slot == slot)
> + && (pci_dev.function == function));
> +}
> +
> +static void test_bdf_parsing()
> +{
> + // valid input
> + assert(test_bdf("0000:00:02.1", 0, 0, 2, 1));
> + assert(test_bdf("00:00:02.1", 0, 0, 2, 1));
> + assert(test_bdf("0000:00:03.0", 0, 0, 3, 0));
> + assert(test_bdf("0000:00:1d.1", 0, 0, 29, 1));
> + assert(test_bdf("0000:09:02.1", 0, 9, 2, 1));
> + assert(test_bdf("0000:1d:02.1", 0, 29, 2, 1));
> + assert(test_bdf("0000:00:02.d", 0, 0, 2, 13));
> + assert(test_bdf("000f:00:02.d", 15, 0, 2, 13));
> + assert(test_bdf("000f:00:02.d", 15, 0, 2, 13));
> + assert(test_bdf("000f:00:02.d", 15, 0, 2, 13));
> + assert(test_bdf("000f:00:02.d", 15, 0, 2, 13));
> + assert(test_bdf("ffff:ff:ff.f", 65535, 255, 255, 15));
> + assert(test_bdf("0:0:2.1", 0, 0, 2, 1));
> +
> + // invalid input
> + assert(!test_bdf("0000:00:02:0", 0, 0, 2, 0));
> + assert(!test_bdf("-0001:00:02.1", -1, 0, 2, 1));
> + assert(!test_bdf("0000.00.02.0", 0, 0, 2, 0));
> + assert(!test_bdf("000f:00:02", 15, 0, 2, 0));
> + assert(!test_bdf("000f:00", 15, 0, 0, 0));
> + assert(!test_bdf("000f", 15, 0, 0, 0));
> + assert(!test_bdf("random string", 0, 0, 0, 0));
> + assert(!test_bdf("12345", 12345, 0, 0, 0));
> +}
> +
> +int main(int argc, char **argv)
> +{
> + test_bdf_parsing();
> + test_sysfs_parsing();
> + test_spice_parsing();
> + test_compare_addresses();
> +}
> +
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