Adds a function to let QEMU provide information to identify graphics
devices and their monitors in the guest. The function
(spice_qxl_set_device_info) sets the device address (e.g. a PCI path)
and monitor ID -> device display ID mapping of displays exposed by given
QXL interface.
Signed-off-by: Lukáš Hrázký <lhrazky@xxxxxxxxxx>
---
server/red-qxl.c | 44 ++++++++++++++++++++++++++++++++++++++
server/spice-qxl.h | 46 ++++++++++++++++++++++++++++++++++++++++
server/spice-server.syms | 5 +++++
3 files changed, 95 insertions(+)
diff --git a/server/red-qxl.c b/server/red-qxl.c
index 97940611..0ea424cd 100644
--- a/server/red-qxl.c
+++ b/server/red-qxl.c
@@ -41,6 +41,9 @@
#include "red-qxl.h"
+#define MAX_DEVICE_ADDRESS_LEN 256
+#define MAX_MONITORS_COUNT 16
+
struct QXLState {
QXLWorker qxl_worker;
QXLInstance *qxl;
@@ -53,6 +56,9 @@ struct QXLState {
unsigned int max_monitors;
RedsState *reds;
RedWorker *worker;
+ char device_address[MAX_DEVICE_ADDRESS_LEN];
+ uint32_t device_display_ids[MAX_MONITORS_COUNT];
+ size_t monitors_count; // length of ^^^
pthread_mutex_t scanout_mutex;
SpiceMsgDisplayGlScanoutUnix scanout;
@@ -846,6 +852,44 @@ void red_qxl_gl_draw_async_complete(QXLInstance *qxl)
red_qxl_async_complete(qxl, cookie);
}
+SPICE_GNUC_VISIBLE
+void spice_qxl_set_device_info(QXLInstance *instance,
+ const char *device_address,
+ uint32_t device_display_id_start,
+ uint32_t device_display_id_count)
+{
+ g_return_if_fail(device_address != NULL);
+
+ size_t da_len = strnlen(device_address, MAX_DEVICE_ADDRESS_LEN);
+ if (da_len >= MAX_DEVICE_ADDRESS_LEN) {
+ spice_error("Device address too long: %lu > %u", da_len, MAX_DEVICE_ADDRESS_LEN);
+ return;
+ }
+
+ if (device_display_id_count > MAX_MONITORS_COUNT) {
+ spice_error("Device display ID count (%u) is greater than limit %u",
+ device_display_id_count,
+ MAX_MONITORS_COUNT);
+ return;
+ }
+
+ strncpy(instance->st->device_address, device_address, MAX_DEVICE_ADDRESS_LEN);
+
+ g_debug("QXL Instance %d setting device address \"%s\" and monitor -> device display mapping:",
+ instance->id,
+ device_address);
+
+ // store the mapping monitor_id -> device_display_id
+ for (uint32_t monitor_id = 0; monitor_id < device_display_id_count; ++monitor_id) {
+ uint32_t device_display_id = device_display_id_start + monitor_id;
+ instance->st->device_display_ids[monitor_id] = device_display_id;
+ g_debug(" monitor ID %u -> device display ID %u",
+ monitor_id, device_display_id);
+ }
+
+ instance->st->monitors_count = device_display_id_count;
+}
+
void red_qxl_init(RedsState *reds, QXLInstance *qxl)
{
QXLState *qxl_state;
diff --git a/server/spice-qxl.h b/server/spice-qxl.h
index 0c4e75fc..547d3d93 100644
--- a/server/spice-qxl.h
+++ b/server/spice-qxl.h
@@ -115,6 +115,52 @@ void spice_qxl_gl_draw_async(QXLInstance *instance,
uint32_t w, uint32_t h,
uint64_t cookie);
+/* since spice 0.14.2 */
+
+/**
+ * spice_qxl_set_device_info:
+ * @instance the QXL instance to set the path to
+ * @device_address the path of the device this QXL instance belongs to
+ * @device_display_id_start the starting device display ID of this interface,
+ * i.e. the one monitor ID 0 maps to
+ * @device_display_id_count the total number of device display IDs on this
+ * interface
+ *
+ * Sets the device information for this QXL interface, i.e. the hardware
+ * address (e.g. PCI) of the graphics device and the IDs of the displays of the
+ * graphics device that are exposed by this interface (device display IDs).
+ *
+ * The supported device address format is:
+ * "pci/<DOMAIN>/<SLOT>.<FUNCTION>/.../<SLOT>.<FUNCTION>"
+ *
+ * The "pci" identifies the rest of the string as a PCI address. It is the only
+ * supported address at the moment, other identifiers can be introduced later.
+ * <DOMAIN> is the PCI domain, followed by <SLOT>.<FUNCTION> of any PCI bridges
+ * in the chain leading to the device. The last <SLOT>.<FUNCTION> is the
+ * graphics device. All of <DOMAIN>, <SLOT>, <FUNCTION> are hexadecimal numbers
+ * with the following number of digits:
+ * <DOMAIN>: 4
+ * <SLOT>: 2
+ * <FUNCTION>: 1
+ *
+ * The device_display_id_{start,count} denotes the sequence of device display
+ * IDs that map to the zero-based sequence of monitor IDs provided by monitors
+ * config on this interface. For example with device_display_id_start = 2 and
+ * device_display_id_count = 3 you get the following mapping:
+ * monitor_id -> device_display_id
+ * 0 -> 2
+ * 1 -> 3
+ * 2 -> 4
+ *
+ * Note this example is unsupported in practice. The only supported cases are
+ * either a single device display ID (count = 1) or multiple device display IDs
+ * in a sequence starting from 0.
+ */
+void spice_qxl_set_device_info(QXLInstance *instance,
+ const char *device_address,
+ uint32_t device_display_id_start,
+ uint32_t device_display_id_count);
+
typedef struct QXLDevInitInfo {
uint32_t num_memslots_groups;
uint32_t num_memslots;
diff --git a/server/spice-server.syms b/server/spice-server.syms
index edf04a42..ac4d9b14 100644
--- a/server/spice-server.syms
+++ b/server/spice-server.syms
@@ -173,3 +173,8 @@ SPICE_SERVER_0.13.2 {
global:
spice_server_set_video_codecs;
} SPICE_SERVER_0.13.1;
+
+SPICE_SERVER_0.14.2 {
+global:
+ spice_qxl_set_device_info;
+} SPICE_SERVER_0.13.2;
--
2.19.1
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