hw/display/apple-gfx: Adds configurable mode list

This change adds a property 'display_modes' on the graphics device
which permits specifying a list of display modes. (screen resolution
and refresh rate)

The property is an array of a custom type to make the syntax slightly
less awkward to use, for example:

-device '{"driver":"apple-gfx-pci", "display-modes":["1920x1080@60", "3840x2160@60"]}'

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Tested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-ID: <20241223221645.29911-5-phil@philjordan.eu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/display/apple-gfx-mmio.m

@@ -255,6 +255,11 @@ static void apple_gfx_mmio_reset(Object *obj, ResetType type)
     [s->common.pgdev reset];
 }
 
+static const Property apple_gfx_mmio_properties[] = {
+    DEFINE_PROP_ARRAY("display-modes", AppleGFXMMIOState,
+                      common.num_display_modes, common.display_modes,
+                      qdev_prop_apple_gfx_display_mode, AppleGFXDisplayMode),
+};
 
 static void apple_gfx_mmio_class_init(ObjectClass *klass, void *data)
 {
@@ -264,6 +269,8 @@ static void apple_gfx_mmio_class_init(ObjectClass *klass, void *data)
     rc->phases.hold = apple_gfx_mmio_reset;
     dc->hotpluggable = false;
     dc->realize = apple_gfx_mmio_realize;
+
+    device_class_set_props(dc, apple_gfx_mmio_properties);
 }
 
 static const TypeInfo apple_gfx_mmio_types[] = {

hw/display/apple-gfx-pci.m

@@ -115,6 +115,12 @@ static void apple_gfx_pci_reset(Object *obj, ResetType type)
     [s->common.pgdev reset];
 }
 
+static const Property apple_gfx_pci_properties[] = {
+    DEFINE_PROP_ARRAY("display-modes", AppleGFXPCIState,
+                      common.num_display_modes, common.display_modes,
+                      qdev_prop_apple_gfx_display_mode, AppleGFXDisplayMode),
+};
+
 static void apple_gfx_pci_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -131,7 +137,7 @@ static void apple_gfx_pci_class_init(ObjectClass *klass, void *data)
     pci->class_id = PCI_CLASS_DISPLAY_OTHER;
     pci->realize = apple_gfx_pci_realize;
 
-    /* TODO: Property for setting mode list */
+    device_class_set_props(dc, apple_gfx_pci_properties);
 }
 
 static const TypeInfo apple_gfx_pci_types[] = {

hw/display/apple-gfx.h

@@ -25,6 +25,12 @@
 
 typedef QTAILQ_HEAD(, PGTask_s) PGTaskList;
 
+typedef struct AppleGFXDisplayMode {
+    uint16_t width_px;
+    uint16_t height_px;
+    uint16_t refresh_rate_hz;
+} AppleGFXDisplayMode;
+
 typedef struct AppleGFXState {
     /* Initialised on init/realize() */
     MemoryRegion iomem_gfx;
@@ -33,6 +39,8 @@ typedef struct AppleGFXState {
     QemuConsole *con;
     id<MTLDevice> mtl;
     id<MTLCommandQueue> mtl_queue;
+    AppleGFXDisplayMode *display_modes;
+    uint32_t num_display_modes;
 
     /* List `tasks` is protected by task_mutex */
     QemuMutex task_mutex;
@@ -60,5 +68,7 @@ void *apple_gfx_host_ptr_for_gpa_range(uint64_t guest_physical,
                                        uint64_t length, bool read_only,
                                        MemoryRegion **mapping_in_region);
 
+extern const PropertyInfo qdev_prop_apple_gfx_display_mode;
+
 #endif
 

hw/display/apple-gfx.m

@@ -31,9 +31,10 @@
 
 #import <ParavirtualizedGraphics/ParavirtualizedGraphics.h>
 
-static const PGDisplayCoord_t apple_gfx_modes[] = {
-    { .x = 1440, .y = 1080 },
-    { .x = 1280, .y = 1024 },
+static const AppleGFXDisplayMode apple_gfx_default_modes[] = {
+    { 1920, 1080, 60 },
+    { 1440, 1080, 60 },
+    { 1280, 1024, 60 },
 };
 
 static Error *apple_gfx_mig_blocker;
@@ -690,22 +691,23 @@ static PGDisplayDescriptor *apple_gfx_prepare_display_descriptor(AppleGFXState *
     return disp_desc;
 }
 
-static NSArray<PGDisplayMode*>* apple_gfx_prepare_display_mode_array(void)
+static NSArray<PGDisplayMode *> *apple_gfx_create_display_mode_array(
+    const AppleGFXDisplayMode display_modes[], uint32_t display_mode_count)
 {
-    PGDisplayMode *modes[ARRAY_SIZE(apple_gfx_modes)];
-    NSArray<PGDisplayMode*>* mode_array;
-    int i;
+    PGDisplayMode *mode_obj;
+    NSMutableArray<PGDisplayMode *> *mode_array =
+        [[NSMutableArray alloc] initWithCapacity:display_mode_count];
 
-    for (i = 0; i < ARRAY_SIZE(apple_gfx_modes); i++) {
-        modes[i] =
-            [[PGDisplayMode alloc] initWithSizeInPixels:apple_gfx_modes[i] refreshRateInHz:60.];
-    }
+    for (unsigned i = 0; i < display_mode_count; i++) {
+        const AppleGFXDisplayMode *mode = &display_modes[i];
+        trace_apple_gfx_display_mode(i, mode->width_px, mode->height_px);
+        PGDisplayCoord_t mode_size = { mode->width_px, mode->height_px };
 
-    mode_array = [NSArray arrayWithObjects:modes count:ARRAY_SIZE(apple_gfx_modes)];
-
-    for (i = 0; i < ARRAY_SIZE(apple_gfx_modes); i++) {
-        [modes[i] release];
-        modes[i] = nil;
+        mode_obj =
+            [[PGDisplayMode alloc] initWithSizeInPixels:mode_size
+                                        refreshRateInHz:mode->refresh_rate_hz];
+        [mode_array addObject:mode_obj];
+        [mode_obj release];
     }
 
     return mode_array;
@@ -741,6 +743,9 @@ bool apple_gfx_common_realize(AppleGFXState *s, DeviceState *dev,
                               PGDeviceDescriptor *desc, Error **errp)
 {
     PGDisplayDescriptor *disp_desc;
+    const AppleGFXDisplayMode *display_modes = apple_gfx_default_modes;
+    uint32_t num_display_modes = ARRAY_SIZE(apple_gfx_default_modes);
+    NSArray<PGDisplayMode *> *mode_array;
 
     if (apple_gfx_mig_blocker == NULL) {
         error_setg(&apple_gfx_mig_blocker,
@@ -776,8 +781,99 @@ bool apple_gfx_common_realize(AppleGFXState *s, DeviceState *dev,
                                               port:0
                                          serialNum:next_pgdisplay_serial_num++];
     [disp_desc release];
-    s->pgdisp.modeList = apple_gfx_prepare_display_mode_array();
+
+    if (s->display_modes != NULL && s->num_display_modes > 0) {
+        trace_apple_gfx_common_realize_modes_property(s->num_display_modes);
+        display_modes = s->display_modes;
+        num_display_modes = s->num_display_modes;
+    }
+    s->pgdisp.modeList = mode_array =
+        apple_gfx_create_display_mode_array(display_modes, num_display_modes);
+    [mode_array release];
 
     s->con = graphic_console_init(dev, 0, &apple_gfx_fb_ops, s);
     return true;
 }
+
+/* ------ Display mode list device property ------ */
+
+static void apple_gfx_get_display_mode(Object *obj, Visitor *v,
+                                       const char *name, void *opaque,
+                                       Error **errp)
+{
+    Property *prop = opaque;
+    AppleGFXDisplayMode *mode = object_field_prop_ptr(obj, prop);
+    /* 3 uint16s (max 5 digits) + 2 separator characters + nul. */
+    char buffer[5 * 3 + 2 + 1];
+    char *pos = buffer;
+
+    int rc = snprintf(buffer, sizeof(buffer),
+                      "%"PRIu16"x%"PRIu16"@%"PRIu16,
+                      mode->width_px, mode->height_px,
+                      mode->refresh_rate_hz);
+    assert(rc < sizeof(buffer));
+
+    visit_type_str(v, name, &pos, errp);
+}
+
+static void apple_gfx_set_display_mode(Object *obj, Visitor *v,
+                                       const char *name, void *opaque,
+                                       Error **errp)
+{
+    Property *prop = opaque;
+    AppleGFXDisplayMode *mode = object_field_prop_ptr(obj, prop);
+    const char *endptr;
+    g_autofree char *str = NULL;
+    int ret;
+    int val;
+
+    if (!visit_type_str(v, name, &str, errp)) {
+        return;
+    }
+
+    endptr = str;
+
+    ret = qemu_strtoi(endptr, &endptr, 10, &val);
+    if (ret || val > UINT16_MAX || val <= 0) {
+        error_setg(errp, "width in '%s' must be a decimal integer number"
+                         " of pixels in the range 1..65535", name);
+        return;
+    }
+    mode->width_px = val;
+    if (*endptr != 'x') {
+        goto separator_error;
+    }
+
+    ret = qemu_strtoi(endptr + 1, &endptr, 10, &val);
+    if (ret || val > UINT16_MAX || val <= 0) {
+        error_setg(errp, "height in '%s' must be a decimal integer number"
+                         " of pixels in the range 1..65535", name);
+        return;
+    }
+    mode->height_px = val;
+    if (*endptr != '@') {
+        goto separator_error;
+    }
+
+    ret = qemu_strtoi(endptr + 1, &endptr, 10, &val);
+    if (ret || val > UINT16_MAX || val <= 0) {
+        error_setg(errp, "refresh rate in '%s'"
+                         " must be a positive decimal integer (Hertz)", name);
+        return;
+    }
+    mode->refresh_rate_hz = val;
+    return;
+
+separator_error:
+    error_setg(errp,
+               "Each display mode takes the format '<width>x<height>@<rate>'");
+}
+
+const PropertyInfo qdev_prop_apple_gfx_display_mode = {
+    .name  = "display_mode",
+    .description =
+        "Display mode in pixels and Hertz, as <width>x<height>@<refresh-rate> "
+        "Example: 3840x2160@60",
+    .get   = apple_gfx_get_display_mode,
+    .set   = apple_gfx_set_display_mode,
+};

hw/display/trace-events

@@ -212,6 +212,8 @@ apple_gfx_cursor_set(uint32_t bpp, uint64_t width, uint64_t height) "bpp=%d widt
 apple_gfx_cursor_show(uint32_t show) "show=%d"
 apple_gfx_cursor_move(void) ""
 apple_gfx_common_init(const char *device_name, size_t mmio_size) "device: %s; MMIO size: %zu bytes"
+apple_gfx_common_realize_modes_property(uint32_t num_modes) "using %u modes supplied by 'display-modes' device property"
+apple_gfx_display_mode(uint32_t mode_idx, uint16_t width_px, uint16_t height_px) "mode %2"PRIu32": %4"PRIu16"x%4"PRIu16
 
 # apple-gfx-mmio.m
 apple_gfx_mmio_iosfc_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64