Enable ALSA debug in kernel

Now gets "virtio_snd: probe of virtio2 failed with error -2" in
dmesg.

Makefile

@@ -13,6 +13,8 @@ OBJS_EXTRA :=
 # command line option
 OPTS :=
 
+LDFLAGS :=
+
 # virtio-blk
 ENABLE_VIRTIOBLK ?= 1
 $(call set-feature, VIRTIOBLK)
@@ -41,6 +43,18 @@ ifeq ($(call has, VIRTIONET), 1)
     OBJS_EXTRA += virtio-net.o
 endif
 
+# virtio-snd
+ENABLE_VIRTIOSND ?= 1
+ifneq ($(UNAME_S),Linux)
+    ENABLE_VIRTIOSND := 0
+endif
+$(call set-feature, VIRTIOSND)
+ifeq ($(call has, VIRTIOSND), 1)
+    OBJS_EXTRA += virtio-snd.o
+    LDFLAGS += -lasound
+    CFLAGS += -I/usr/local/include
+endif
+
 BIN = semu
 all: $(BIN) minimal.dtb
 

configs/buildroot.config

@@ -36,6 +36,9 @@ BR2_RELRO_NONE=y
 # BR2_RELRO_PARTIAL is not set
 # BR2_RELRO_FULL is not set
 BR2_FORTIFY_SOURCE_1=y
+BR2_PACKAGE_ALSA_UTILS=y
+BR2_PACKAGE_ALSA_UTILS_APLAY=y
+BR2_PACKAGE_ALSA_UTILS_SPEAKER_TEST=y
 # BR2_PACKAGE_URANDOM_SCRIPTS is not set
 BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_CPIO_FULL=y

configs/linux.config

@@ -1,11 +1,15 @@
-CONFIG_CC_VERSION_TEXT="riscv32-buildroot-linux-gnu-gcc.br_real (Buildroot 2023.05.1) 12.3.0"
+#
+# Automatically generated file; DO NOT EDIT.
+# Linux/riscv 6.1.106 Kernel Configuration
+#
+CONFIG_CC_VERSION_TEXT="riscv32-buildroot-linux-gnu-gcc.br_real (Buildroot -gd0bd1549) 12.4.0"
 CONFIG_CC_IS_GCC=y
-CONFIG_GCC_VERSION=120300
+CONFIG_GCC_VERSION=120400
 CONFIG_CLANG_VERSION=0
 CONFIG_AS_IS_GNU=y
-CONFIG_AS_VERSION=23900
+CONFIG_AS_VERSION=24100
 CONFIG_LD_IS_BFD=y
-CONFIG_LD_VERSION=23900
+CONFIG_LD_VERSION=24100
 CONFIG_LLD_VERSION=0
 CONFIG_CC_CAN_LINK=y
 CONFIG_CC_CAN_LINK_STATIC=y
@@ -21,7 +25,6 @@ CONFIG_THREAD_INFO_IN_TASK=y
 #
 # General setup
 #
-CONFIG_BROKEN_ON_SMP=y
 CONFIG_INIT_ENV_ARG_LIMIT=32
 # CONFIG_COMPILE_TEST is not set
 # CONFIG_WERROR is not set
@@ -43,6 +46,7 @@ CONFIG_HAVE_ARCH_AUDITSYSCALL=y
 #
 CONFIG_GENERIC_IRQ_SHOW=y
 CONFIG_GENERIC_IRQ_SHOW_LEVEL=y
+CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK=y
 CONFIG_HARDIRQS_SW_RESEND=y
 CONFIG_IRQ_DOMAIN=y
 CONFIG_IRQ_DOMAIN_HIERARCHY=y
@@ -54,8 +58,12 @@ CONFIG_SPARSE_IRQ=y
 CONFIG_GENERIC_IRQ_MULTI_HANDLER=y
 CONFIG_ARCH_CLOCKSOURCE_INIT=y
 CONFIG_GENERIC_CLOCKEVENTS=y
+CONFIG_ARCH_HAS_TICK_BROADCAST=y
+CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
 CONFIG_HAVE_POSIX_CPU_TIMERS_TASK_WORK=y
 CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y
+CONFIG_CONTEXT_TRACKING=y
+CONFIG_CONTEXT_TRACKING_IDLE=y
 
 #
 # Timers subsystem
@@ -92,18 +100,23 @@ CONFIG_TICK_CPU_ACCOUNTING=y
 # CONFIG_PSI is not set
 # end of CPU/Task time and stats accounting
 
+CONFIG_CPU_ISOLATION=y
+
 #
 # RCU Subsystem
 #
-CONFIG_TINY_RCU=y
+CONFIG_TREE_RCU=y
 # CONFIG_RCU_EXPERT is not set
 CONFIG_SRCU=y
-CONFIG_TINY_SRCU=y
+CONFIG_TREE_SRCU=y
+CONFIG_RCU_STALL_COMMON=y
+CONFIG_RCU_NEED_SEGCBLIST=y
 # end of RCU Subsystem
 
 # CONFIG_IKCONFIG is not set
 # CONFIG_IKHEADERS is not set
 CONFIG_LOG_BUF_SHIFT=16
+CONFIG_LOG_CPU_MAX_BUF_SHIFT=12
 CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=12
 # CONFIG_PRINTK_INDEX is not set
 CONFIG_GENERIC_SCHED_CLOCK=y
@@ -114,7 +127,7 @@ CONFIG_GENERIC_SCHED_CLOCK=y
 # end of Scheduler features
 
 CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough=5"
-CONFIG_GCC11_NO_ARRAY_BOUNDS=y
+CONFIG_GCC10_NO_ARRAY_BOUNDS=y
 CONFIG_CC_NO_ARRAY_BOUNDS=y
 # CONFIG_CGROUPS is not set
 # CONFIG_NAMESPACES is not set
@@ -224,7 +237,10 @@ CONFIG_ARCH_RV32I=y
 CONFIG_CMODEL_MEDANY=y
 CONFIG_MODULE_SECTIONS=y
 CONFIG_SMP=y
+CONFIG_NR_CPUS=32
+# CONFIG_HOTPLUG_CPU is not set
 CONFIG_TUNE_GENERIC=y
+# CONFIG_NUMA is not set
 # CONFIG_RISCV_ISA_C is not set
 CONFIG_TOOLCHAIN_HAS_ZICBOM=y
 # CONFIG_RISCV_ISA_ZICBOM is not set
@@ -243,6 +259,7 @@ CONFIG_HZ_250=y
 CONFIG_HZ=250
 CONFIG_SCHED_HRTICK=y
 # CONFIG_RISCV_SBI_V01 is not set
+# CONFIG_RISCV_BOOT_SPINWAIT is not set
 # CONFIG_KEXEC is not set
 # CONFIG_CRASH_DUMP is not set
 # end of Kernel features
@@ -274,6 +291,7 @@ CONFIG_CC_HAVE_STACKPROTECTOR_TLS=y
 # end of CPU Power Management
 
 # CONFIG_VIRTUALIZATION is not set
+CONFIG_CPU_MITIGATIONS=y
 
 #
 # General architecture-dependent options
@@ -325,7 +343,7 @@ CONFIG_COMPAT_32BIT_TIME=y
 CONFIG_ARCH_OPTIONAL_KERNEL_RWX=y
 CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT=y
 CONFIG_ARCH_HAS_STRICT_KERNEL_RWX=y
-CONFIG_STRICT_KERNEL_RWX=n
+# CONFIG_STRICT_KERNEL_RWX is not set
 CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
 CONFIG_STRICT_MODULE_RWX=y
 # CONFIG_LOCK_EVENT_COUNTS is not set
@@ -394,8 +412,13 @@ CONFIG_INLINE_READ_UNLOCK_IRQ=y
 CONFIG_INLINE_WRITE_UNLOCK=y
 CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
 CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
+CONFIG_MUTEX_SPIN_ON_OWNER=y
+CONFIG_RWSEM_SPIN_ON_OWNER=y
+CONFIG_LOCK_SPIN_ON_OWNER=y
 CONFIG_ARCH_USE_QUEUED_RWLOCKS=y
+CONFIG_QUEUED_RWLOCKS=y
 CONFIG_ARCH_HAS_MMIOWB=y
+CONFIG_MMIOWB=y
 CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE=y
 
 #
@@ -425,6 +448,7 @@ CONFIG_SLAB_MERGE_DEFAULT=y
 # CONFIG_SLAB_FREELIST_RANDOM is not set
 # CONFIG_SLAB_FREELIST_HARDENED is not set
 # CONFIG_SLUB_STATS is not set
+CONFIG_SLUB_CPU_PARTIAL=y
 # end of SLAB allocator options
 
 # CONFIG_SHUFFLE_PAGE_ALLOCATOR is not set
@@ -438,10 +462,10 @@ CONFIG_COMPACTION=y
 CONFIG_COMPACT_UNEVICTABLE_DEFAULT=1
 # CONFIG_PAGE_REPORTING is not set
 CONFIG_MIGRATION=y
+CONFIG_PCP_BATCH_SCALE_MAX=5
 # CONFIG_KSM is not set
 CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
 CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
-CONFIG_NEED_PER_CPU_KM=y
 # CONFIG_CMA is not set
 CONFIG_GENERIC_EARLY_IOREMAP=y
 # CONFIG_IDLE_PAGE_TRACKING is not set
@@ -531,8 +555,14 @@ CONFIG_DEFAULT_TCP_CONG="cubic"
 # CONFIG_NET_L3_MASTER_DEV is not set
 # CONFIG_QRTR is not set
 # CONFIG_NET_NCSI is not set
+CONFIG_PCPU_DEV_REFCNT=y
+CONFIG_RPS=y
+CONFIG_RFS_ACCEL=y
+CONFIG_SOCK_RX_QUEUE_MAPPING=y
+CONFIG_XPS=y
 CONFIG_NET_RX_BUSY_POLL=y
 CONFIG_BQL=y
+CONFIG_NET_FLOW_LIMIT=y
 
 #
 # Network testing
@@ -887,7 +917,6 @@ CONFIG_BCMA_POSSIBLE=y
 # CONFIG_MFD_MT6397 is not set
 # CONFIG_MFD_SM501 is not set
 CONFIG_MFD_SYSCON=y
-# CONFIG_MFD_TI_AM335X_TSCADC is not set
 # CONFIG_MFD_TQMX86 is not set
 # end of Multifunction device drivers
 
@@ -936,7 +965,43 @@ CONFIG_DUMMY_CONSOLE_ROWS=25
 # end of Console display driver support
 # end of Graphics support
 
-# CONFIG_SOUND is not set
+CONFIG_SOUND=y
+CONFIG_SND=y
+CONFIG_SND_TIMER=y
+CONFIG_SND_PCM=y
+CONFIG_SND_JACK=y
+CONFIG_SND_JACK_INPUT_DEV=y
+# CONFIG_SND_OSSEMUL is not set
+CONFIG_SND_PCM_TIMER=y
+# CONFIG_SND_HRTIMER is not set
+# CONFIG_SND_DYNAMIC_MINORS is not set
+CONFIG_SND_SUPPORT_OLD_API=y
+CONFIG_SND_PROC_FS=y
+CONFIG_SND_VERBOSE_PROCFS=y
+CONFIG_SND_VERBOSE_PRINTK=y
+CONFIG_SND_CTL_FAST_LOOKUP=y
+CONFIG_SND_DEBUG=y
+CONFIG_SND_DEBUG_VERBOSE=y
+CONFIG_SND_PCM_XRUN_DEBUG=y
+# CONFIG_SND_CTL_INPUT_VALIDATION is not set
+# CONFIG_SND_CTL_DEBUG is not set
+# CONFIG_SND_JACK_INJECTION_DEBUG is not set
+# CONFIG_SND_SEQUENCER is not set
+CONFIG_SND_DRIVERS=y
+# CONFIG_SND_DUMMY is not set
+# CONFIG_SND_ALOOP is not set
+# CONFIG_SND_MTPAV is not set
+# CONFIG_SND_SERIAL_U16550 is not set
+# CONFIG_SND_MPU401 is not set
+
+#
+# HD-Audio
+#
+# end of HD-Audio
+
+CONFIG_SND_HDA_PREALLOC_SIZE=64
+# CONFIG_SND_SOC is not set
+CONFIG_SND_VIRTIO=y
 
 #
 # HID support
@@ -1400,6 +1465,7 @@ CONFIG_CRYPTO_HASH2=y
 # CONFIG_CRYPTO_USER is not set
 CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=y
 # CONFIG_CRYPTO_NULL is not set
+# CONFIG_CRYPTO_PCRYPT is not set
 # CONFIG_CRYPTO_CRYPTD is not set
 # CONFIG_CRYPTO_AUTHENC is not set
 # CONFIG_CRYPTO_TEST is not set
@@ -1579,12 +1645,15 @@ CONFIG_ZSTD_COMMON=y
 CONFIG_ZSTD_DECOMPRESS=y
 # CONFIG_XZ_DEC is not set
 CONFIG_DECOMPRESS_ZSTD=y
+CONFIG_XARRAY_MULTI=y
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT_MAP=y
 CONFIG_HAS_DMA=y
 CONFIG_DMA_DECLARE_COHERENT=y
 # CONFIG_DMA_API_DEBUG is not set
 # CONFIG_DMA_MAP_BENCHMARK is not set
+# CONFIG_FORCE_NR_CPUS is not set
+CONFIG_CPU_RMAP=y
 CONFIG_DQL=y
 CONFIG_NLATTR=y
 CONFIG_GENERIC_ATOMIC64=y
@@ -1629,6 +1698,7 @@ CONFIG_DEBUG_KERNEL=y
 # Compile-time checks and compiler options
 #
 CONFIG_DEBUG_INFO=y
+CONFIG_AS_HAS_NON_CONST_LEB128=y
 # CONFIG_DEBUG_INFO_NONE is not set
 # CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT is not set
 # CONFIG_DEBUG_INFO_DWARF4 is not set
@@ -1681,7 +1751,6 @@ CONFIG_HAVE_KCSAN_COMPILER=y
 # CONFIG_SLUB_DEBUG is not set
 # CONFIG_PAGE_OWNER is not set
 # CONFIG_PAGE_POISONING is not set
-# CONFIG_DEBUG_RODATA_TEST is not set
 CONFIG_ARCH_HAS_DEBUG_WX=y
 # CONFIG_DEBUG_WX is not set
 CONFIG_GENERIC_PTDUMP=y
@@ -1698,6 +1767,7 @@ CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE=y
 CONFIG_ARCH_HAS_DEBUG_VIRTUAL=y
 # CONFIG_DEBUG_VIRTUAL is not set
 # CONFIG_DEBUG_MEMORY_INIT is not set
+# CONFIG_DEBUG_PER_CPU_MAPS is not set
 CONFIG_CC_HAS_KASAN_GENERIC=y
 CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS=y
 # end of Memory Debugging
@@ -1768,6 +1838,8 @@ CONFIG_LOCK_DEBUGGING_SUPPORT=y
 # CONFIG_RCU_SCALE_TEST is not set
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_RCU_REF_SCALE_TEST is not set
+CONFIG_RCU_CPU_STALL_TIMEOUT=21
+CONFIG_RCU_EXP_CPU_STALL_TIMEOUT=0
 # CONFIG_RCU_TRACE is not set
 # CONFIG_RCU_EQS_DEBUG is not set
 # end of RCU Debugging

device.h

@@ -190,6 +190,52 @@ void clint_write(hart_t *vm,
                  uint8_t width,
                  uint32_t value);
 
+#if SEMU_HAS(VIRTIOSND)
+
+#define IRQ_VSND 4
+#define IRQ_VSND_BIT (1 << IRQ_VSND)
+
+typedef struct {
+    uint32_t QueueNum;
+    uint32_t QueueDesc;
+    uint32_t QueueAvail;
+    uint32_t QueueUsed;
+    uint16_t last_avail;
+    bool ready;
+} virtio_snd_queue_t;
+
+typedef struct {
+    /* feature negotiation */
+    uint32_t DeviceFeaturesSel;
+    uint32_t DriverFeatures;
+    uint32_t DriverFeaturesSel;
+    /* queue config */
+    uint32_t QueueSel;
+    virtio_snd_queue_t queues[2];
+    /* status */
+    uint32_t Status;
+    uint32_t InterruptStatus;
+    /* supplied by environment */
+    uint32_t *ram;
+    /* implementation-specific */
+    void *priv;
+} virtio_snd_state_t;
+
+void virtio_snd_read(hart_t *core,
+                     virtio_snd_state_t *vsnd,
+                     uint32_t addr,
+                     uint8_t width,
+                     uint32_t *value);
+
+void virtio_snd_write(hart_t *core,
+                      virtio_snd_state_t *vsnd,
+                      uint32_t addr,
+                      uint8_t width,
+                      uint32_t value);
+
+bool virtio_snd_init(virtio_snd_state_t *vsnd);
+#endif
+
 /* memory mapping */
 
 typedef struct {
@@ -205,4 +251,8 @@ typedef struct {
     virtio_blk_state_t vblk;
 #endif
     clint_state_t clint;
+#if SEMU_HAS(VIRTIOSND)
+    virtio_snd_state_t vsnd;
+#endif
+    uint64_t timer;
 } emu_state_t;

feature.h

@@ -12,5 +12,10 @@
 #define SEMU_FEATUREVIRTIONET 1
 #endif
 
+/* virtio-snd */
+#ifndef SEMU_FEATUREVIRTIOSND
+#define SEMU_FEATUREVIRTIOSND 1
+#endif
+
 /* Feature test macro */
 #define SEMU_HAS(x) SEMU_FEATURE_##x