[Userspace LL] scattered commits from #10945 without dependencies

[lyakh]

various commits from #10945 without unmerged dependencies

[Copilot]

Pull request overview

This PR cherry-picks a set of userspace-LL–related changes (from #10945) to support userspace low-latency scheduling, including userspace-safe module allocation/freeing paths and memory-domain handling for dynamically loaded modules and DP vregion-backed allocations.

Changes:

• Extend module/vregion allocation plumbing to track vregion address/size and (when CONFIG_SOF_USERSPACE_LL) map/unmap vregion memory into the LL memory domain via syscalls.
• Update library manager + LLEXT manager to better integrate with Zephyr userspace (syscall for module free, LL domain integration, DP-domain exceptions).
• Refactor IPC user thread creation to allocate kernel objects dynamically and improve multi-pipeline state handling safety.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
zephyr/include/rtos/alloc.h	Extends mod_alloc_ctx with vregion base/size for domain mapping/unmapping.
zephyr/CMakeLists.txt	Adds lib_manager.h to Zephyr syscall header generation.
src/schedule/zephyr_dp_schedule.c	Moves scheduler state allocation to heap allocator and ensures ops struct is in sysuser data.
src/library_manager/llext_manager.c	Adds LL-domain mapping logic and refactors module-domain add/remove internals.
src/library_manager/lib_manager.c	Introduces syscall-backed module free and refactors module create/free helper paths.
src/ipc/ipc4/helper.c	Tightens pointer types used for IPC payload parsing (unsigned char *).
src/ipc/ipc4/handler-user.c	Extracts pipeline ID parsing and adds mailbox bounds checks for multi-pipeline IPC.
src/ipc/ipc-helper.c	Adjusts locking path for userspace LL builds (avoid unused IRQ flags).
src/ipc/ipc-common.c	Refactors IPC userspace thread creation to use dynamically allocated kernel objects.
src/include/sof/lib_manager.h	Adds syscall declaration and exposes lib_manager_mod_create_priv() helper.
src/include/sof/audio/module_adapter/module/generic.h	Adds syscalls for vregion creation/unmapping and exports vregion-free helper.
src/include/sof/audio/component.h	Adds uid_cp storage to keep stable UUID backing for LLEXT module drivers.
src/audio/module_adapter/module_adapter.c	Implements vregion syscalls, LL-domain partition mapping/unmapping, and unified vregion free helper.
src/audio/buffers/comp_buffer.c	Switches vregion-backed buffer teardown to the new module_adapter_vreg_free() helper.

Suppressed comments (3)

src/ipc/ipc4/handler-user.c:460

• dcache_invalidate_region() is invalidating cnt entries of a uint32_t array, but uses sizeof(int) * cnt. This is the wrong element size and can under/over-invalidate depending on platform type sizes.

	dcache_invalidate_region((__sparse_force void __sparse_cache *)ppl_data->ppl_id,
				 sizeof(int) * cnt);

src/ipc/ipc4/handler-user.c:498

• When there is a single pipeline, ppl_id = &id; points a const uint32_t * at an int. This is a type/size mismatch and can lead to incorrect ppl_id[i] values when iterating.

	if (ppl_count == 1)
		ppl_id = &id;

src/audio/module_adapter/module_adapter.c:154

• vreg_start and vreg_size are uninitialized when the vregion path is not taken, but are still copied into alloc. Even if currently unused when alloc->vreg == NULL, this is undefined/indeterminate data and can trigger compiler or static-analysis warnings.

	size_t vreg_size;
	uintptr_t vreg_start;