hw/display/apple-gfx: Adds PCI implementation

This change wires up the PCI variant of the paravirtualised
graphics device, mainly useful for x86-64 macOS guests, implemented
by macOS's ParavirtualizedGraphics.framework. It builds on code
shared with the vmapple/mmio variant of the PVG device.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-ID: <20241223221645.29911-4-phil@philjordan.eu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

4 files changed, 157 insertions, 0 deletions

diff --git a/hw/display/Kconfig b/hw/display/Kconfig
index 6a9b7b1..2b53dfd 100644
--- a/hw/display/Kconfig
+++ b/hw/display/Kconfig
@@ -149,3 +149,7 @@ config MAC_PVG_MMIO
     bool
     depends on MAC_PVG && AARCH64
 
+config MAC_PVG_PCI
+    bool
+    depends on MAC_PVG && PCI
+    default y if PCI_DEVICES
diff --git a/hw/display/apple-gfx-pci.m b/hw/display/apple-gfx-pci.m
new file mode 100644
index 0000000..35a3c7a
--- /dev/null
+++ b/hw/display/apple-gfx-pci.m
@@ -0,0 +1,151 @@
+/*
+ * QEMU Apple ParavirtualizedGraphics.framework device, PCI variant
+ *
+ * Copyright © 2023-2024 Phil Dennis-Jordan
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * ParavirtualizedGraphics.framework is a set of libraries that macOS provides
+ * which implements 3d graphics passthrough to the host as well as a
+ * proprietary guest communication channel to drive it. This device model
+ * implements support to drive that library from within QEMU as a PCI device
+ * aimed primarily at x86-64 macOS VMs.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/pci/pci_device.h"
+#include "hw/pci/msi.h"
+#include "apple-gfx.h"
+#include "trace.h"
+
+#import <ParavirtualizedGraphics/ParavirtualizedGraphics.h>
+
+OBJECT_DECLARE_SIMPLE_TYPE(AppleGFXPCIState, APPLE_GFX_PCI)
+
+struct AppleGFXPCIState {
+    PCIDevice parent_obj;
+
+    AppleGFXState common;
+};
+
+static const char *apple_gfx_pci_option_rom_path = NULL;
+
+static void apple_gfx_init_option_rom_path(void)
+{
+    NSURL *option_rom_url = PGCopyOptionROMURL();
+    const char *option_rom_path = option_rom_url.fileSystemRepresentation;
+    apple_gfx_pci_option_rom_path = g_strdup(option_rom_path);
+    [option_rom_url release];
+}
+
+static void apple_gfx_pci_init(Object *obj)
+{
+    AppleGFXPCIState *s = APPLE_GFX_PCI(obj);
+
+    if (!apple_gfx_pci_option_rom_path) {
+        /*
+         * The following is done on device not class init to avoid running
+         * ObjC code before fork() in -daemonize mode.
+         */
+        PCIDeviceClass *pci = PCI_DEVICE_CLASS(object_get_class(obj));
+        apple_gfx_init_option_rom_path();
+        pci->romfile = apple_gfx_pci_option_rom_path;
+    }
+
+    apple_gfx_common_init(obj, &s->common, TYPE_APPLE_GFX_PCI);
+}
+
+typedef struct AppleGFXPCIInterruptJob {
+    PCIDevice *device;
+    uint32_t vector;
+} AppleGFXPCIInterruptJob;
+
+static void apple_gfx_pci_raise_interrupt(void *opaque)
+{
+    AppleGFXPCIInterruptJob *job = opaque;
+
+    if (msi_enabled(job->device)) {
+        msi_notify(job->device, job->vector);
+    }
+    g_free(job);
+}
+
+static void apple_gfx_pci_interrupt(PCIDevice *dev, uint32_t vector)
+{
+    AppleGFXPCIInterruptJob *job;
+
+    trace_apple_gfx_raise_irq(vector);
+    job = g_malloc0(sizeof(*job));
+    job->device = dev;
+    job->vector = vector;
+    aio_bh_schedule_oneshot(qemu_get_aio_context(),
+                            apple_gfx_pci_raise_interrupt, job);
+}
+
+static void apple_gfx_pci_realize(PCIDevice *dev, Error **errp)
+{
+    AppleGFXPCIState *s = APPLE_GFX_PCI(dev);
+    int ret;
+
+    pci_register_bar(dev, PG_PCI_BAR_MMIO,
+                     PCI_BASE_ADDRESS_SPACE_MEMORY, &s->common.iomem_gfx);
+
+    ret = msi_init(dev, 0x0 /* config offset; 0 = find space */,
+                   PG_PCI_MAX_MSI_VECTORS, true /* msi64bit */,
+                   false /* msi_per_vector_mask */, errp);
+    if (ret != 0) {
+        return;
+    }
+
+    @autoreleasepool {
+        PGDeviceDescriptor *desc = [PGDeviceDescriptor new];
+        desc.raiseInterrupt = ^(uint32_t vector) {
+            apple_gfx_pci_interrupt(dev, vector);
+        };
+
+        apple_gfx_common_realize(&s->common, DEVICE(dev), desc, errp);
+        [desc release];
+        desc = nil;
+    }
+}
+
+static void apple_gfx_pci_reset(Object *obj, ResetType type)
+{
+    AppleGFXPCIState *s = APPLE_GFX_PCI(obj);
+    [s->common.pgdev reset];
+}
+
+static void apple_gfx_pci_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *pci = PCI_DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+    rc->phases.hold = apple_gfx_pci_reset;
+    dc->desc = "macOS Paravirtualized Graphics PCI Display Controller";
+    dc->hotpluggable = false;
+    set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
+
+    pci->vendor_id = PG_PCI_VENDOR_ID;
+    pci->device_id = PG_PCI_DEVICE_ID;
+    pci->class_id = PCI_CLASS_DISPLAY_OTHER;
+    pci->realize = apple_gfx_pci_realize;
+
+    /* TODO: Property for setting mode list */
+}
+
+static const TypeInfo apple_gfx_pci_types[] = {
+    {
+        .name          = TYPE_APPLE_GFX_PCI,
+        .parent        = TYPE_PCI_DEVICE,
+        .instance_size = sizeof(AppleGFXPCIState),
+        .class_init    = apple_gfx_pci_class_init,
+        .instance_init = apple_gfx_pci_init,
+        .interfaces = (InterfaceInfo[]) {
+            { INTERFACE_PCIE_DEVICE },
+            { },
+        },
+    }
+};
+DEFINE_TYPES(apple_gfx_pci_types)
+
diff --git a/hw/display/apple-gfx.h b/hw/display/apple-gfx.h
index 4cd4163..6c74209 100644
--- a/hw/display/apple-gfx.h
+++ b/hw/display/apple-gfx.h
@@ -14,6 +14,7 @@
 #include "ui/surface.h"
 
 #define TYPE_APPLE_GFX_MMIO         "apple-gfx-mmio"
+#define TYPE_APPLE_GFX_PCI          "apple-gfx-pci"
 
 @class PGDeviceDescriptor;
 @protocol PGDevice;
diff --git a/hw/display/meson.build b/hw/display/meson.build
index cf9e6dd..94f4f05 100644
--- a/hw/display/meson.build
+++ b/hw/display/meson.build
@@ -63,6 +63,7 @@ system_ss.add(when: 'CONFIG_ATI_VGA', if_true: [files('ati.c', 'ati_2d.c', 'ati_
 
 if host_os == 'darwin'
   system_ss.add(when: 'CONFIG_MAC_PVG',         if_true: [files('apple-gfx.m'), pvg, metal])
+  system_ss.add(when: 'CONFIG_MAC_PVG_PCI',     if_true: [files('apple-gfx-pci.m'), pvg, metal])
   if cpu == 'aarch64'
     system_ss.add(when: 'CONFIG_MAC_PVG_MMIO',  if_true: [files('apple-gfx-mmio.m'), pvg, metal])
   endif