hw/display/apple-gfx: Introduce ParavirtualizedGraphics.Framework support

MacOS provides a framework (library) that allows any vmm to implement a
paravirtualized 3d graphics passthrough to the host metal stack called
ParavirtualizedGraphics.Framework (PVG). The library abstracts away
almost every aspect of the paravirtualized device model and only provides
and receives callbacks on MMIO access as well as to share memory address
space between the VM and PVG.

This patch implements a QEMU device that drives PVG for the VMApple
variant of it.

Signed-off-by: Alexander Graf <graf@amazon.com>
Co-authored-by: Alexander Graf <graf@amazon.com>

Subsequent changes:

 * Cherry-pick/rebase conflict fixes, API use updates.
 * Moved from hw/vmapple/ (useful outside that machine type)
 * Overhaul of threading model, many thread safety improvements.
 * Asynchronous rendering.
 * Memory and object lifetime fixes.
 * Refactoring to split generic and (vmapple) MMIO variant specific
   code.

Implementation wise, most of the complexity lies in the differing threading
models of ParavirtualizedGraphics.framework, which uses libdispatch and
internal locks, versus QEMU, which heavily uses the BQL, especially during
memory-mapped device I/O. Great care has therefore been taken to prevent
deadlocks by never calling into PVG methods while holding the BQL, and
similarly never acquiring the BQL in a callback from PVG. Different strategies
have been used (libdispatch, blocking and non-blocking BHs, RCU, etc.)
depending on the specific requirements at each framework entry and exit point.

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: <20241223221645.29911-3-phil@philjordan.eu>
[PMD: Re-ordered imported headers, style fixups]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/hw/display/trace-events b/hw/display/trace-events
index d26d663f96..a50e4eea0c 100644
--- a/hw/display/trace-events
+++ b/hw/display/trace-events
@@ -194,3 +194,31 @@ dm163_bits_ppi(unsigned dest_width) "dest_width : %u"
 dm163_leds(int led, uint32_t value) "led %d: 0x%x"
 dm163_channels(int channel, uint8_t value) "channel %d: 0x%x"
 dm163_refresh_rate(uint32_t rr) "refresh rate %d"
+
+# apple-gfx.m
+apple_gfx_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64
+apple_gfx_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64
+apple_gfx_create_task(uint32_t vm_size, void *va) "vm_size=0x%x base_addr=%p"
+apple_gfx_destroy_task(void *task, unsigned int num_mapped_regions) "task=%p, task->mapped_regions->len=%u"
+apple_gfx_map_memory(void *task, uint32_t range_count, uint64_t virtual_offset, uint32_t read_only) "task=%p range_count=0x%x virtual_offset=0x%"PRIx64" read_only=%d"
+apple_gfx_map_memory_range(uint32_t i, uint64_t phys_addr, uint64_t phys_len) "[%d] phys_addr=0x%"PRIx64" phys_len=0x%"PRIx64
+apple_gfx_remap(uint64_t retval, void *source_ptr, uint64_t target) "retval=%"PRId64" source=%p target=0x%"PRIx64
+apple_gfx_unmap_memory(void *task, uint64_t virtual_offset, uint64_t length) "task=%p virtual_offset=0x%"PRIx64" length=0x%"PRIx64
+apple_gfx_read_memory(uint64_t phys_address, uint64_t length, void *dst) "phys_addr=0x%"PRIx64" length=0x%"PRIx64" dest=%p"
+apple_gfx_raise_irq(uint32_t vector) "vector=0x%x"
+apple_gfx_new_frame(void) ""
+apple_gfx_mode_change(uint64_t x, uint64_t y) "x=%"PRId64" y=%"PRId64
+apple_gfx_cursor_set(uint32_t bpp, uint64_t width, uint64_t height) "bpp=%d width=%"PRId64" height=0x%"PRId64
+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-mmio.m
+apple_gfx_mmio_iosfc_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64
+apple_gfx_mmio_iosfc_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64
+apple_gfx_iosfc_map_memory(uint64_t phys, uint64_t len, uint32_t ro, void *va, void *e, void *f, void* va_result) "phys=0x%"PRIx64" len=0x%"PRIx64" ro=%d va=%p e=%p f=%p -> *va=%p"
+apple_gfx_iosfc_map_memory_new_region(size_t i, void *region, uint64_t start, uint64_t end) "index=%zu, region=%p, 0x%"PRIx64"-0x%"PRIx64
+apple_gfx_iosfc_unmap_memory(void *a, void *b, void *c, void *d, void *e, void *f) "a=%p b=%p c=%p d=%p e=%p f=%p"
+apple_gfx_iosfc_unmap_memory_region(void* mem, void *region) "unmapping @ %p from memory region %p"
+apple_gfx_iosfc_raise_irq(uint32_t vector) "vector=0x%x"
+