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userspace: proxy: Add support for llext modules #10643

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c51277d
manifest: rimage: llext: Add user_mode param to SOF_LLEXT_MODULE_MANI…
softwarecki Mar 23, 2026
2da0845
userspace: proxy: Add support for llext modules
softwarecki Mar 3, 2026
7fa81f8
fast_get: Enable buffer sharing when using module driver heap
softwarecki Mar 20, 2026
761633a
userspace: proxy: Add partition for k_heap struct
softwarecki Mar 19, 2026
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38 changes: 31 additions & 7 deletions src/audio/module_adapter/library/userspace_proxy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@
#include <stdint.h>

#include <sof/lib_manager.h>
#include <sof/llext_manager.h>
#include <sof/audio/component.h>
#include <sof/schedule/dp_schedule.h>
#include <rtos/userspace_helper.h>
Expand Down Expand Up @@ -163,6 +164,7 @@ static int user_work_item_init(struct userspace_context *user_ctx, struct k_heap
work_item->event = &worker.event;
#endif
work_item->params.context = user_ctx;
work_item->params.mod = NULL;
user_ctx->work_item = work_item;

return 0;
Expand Down Expand Up @@ -274,8 +276,24 @@ static int userspace_proxy_memory_init(struct userspace_context *user_ctx,
tr_dbg(&userspace_proxy_tr, "Heap partition %#lx + %zx, attr = %u",
heap_part.start, heap_part.size, heap_part.attr);

#if !defined(CONFIG_XTENSA_MMU_DOUBLE_MAP) && defined(CONFIG_SOF_ZEPHYR_HEAP_CACHED)
#define HEAP_PART_CACHED
/* When a new memory domain is created, only the "factory" entries from the L2 page
* tables are copied. Memory that was dynamically mapped during firmware execution
* will not be accessible from the new domain. The k_heap structure (drv->user_heap)
* resides in such dynamically mapped memory, so we must explicitly add a partition
* for it to ensure that syscalls can access this structure from the userspace domain.
*/
struct k_mem_partition heap_struct_part;

k_mem_region_align(&heap_struct_part.start, &heap_struct_part.size,
POINTER_TO_UINT(drv->user_heap),
sizeof(*drv->user_heap), CONFIG_MM_DRV_PAGE_SIZE);
heap_struct_part.attr = K_MEM_PARTITION_P_RW_U_NA |
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Copilot AI Mar 23, 2026

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The added partition is intended so that drv->user_heap 'can be referenced by syscalls' from the userspace domain, but it is created with U_NA (no user access). For syscall argument validation and/or user-mode access to succeed, the partition typically needs user permissions (e.g., K_MEM_PARTITION_P_RW_U_RO or K_MEM_PARTITION_P_RW_U_RW, depending on the expected access pattern). With U_NA, userspace likely cannot legally reference the k_heap object.

Suggested change
heap_struct_part.attr = K_MEM_PARTITION_P_RW_U_NA |
heap_struct_part.attr = K_MEM_PARTITION_P_RW_U_RO |

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user_get_partition_attr(heap_struct_part.start);

tr_err(&userspace_proxy_tr, "Heap struct partition %#lx + %zx, attr = %u",
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This looks like informational tracing (similar to the surrounding tr_dbg() partition logs) but is emitted as tr_err(). Logging this at error level can create noisy logs and false-positive error signals in production. Consider downgrading this to tr_dbg() (or tr_info() if you want it visible by default).

Suggested change
tr_err(&userspace_proxy_tr, "Heap struct partition %#lx + %zx, attr = %u",
tr_dbg(&userspace_proxy_tr, "Heap struct partition %#lx + %zx, attr = %u",

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heap_struct_part.start, heap_struct_part.size, heap_struct_part.attr);

#if defined(CONFIG_SOF_ZEPHYR_HEAP_CACHED)
/* Add cached module private heap to memory partitions */
struct k_mem_partition heap_cached_part = {
.attr = K_MEM_PARTITION_P_RW_U_RW | XTENSA_MMU_CACHED_WB
Expand All @@ -294,10 +312,11 @@ static int userspace_proxy_memory_init(struct userspace_context *user_ctx,
* These include ops structures marked with APP_TASK_DATA.
*/
&common_partition,
#ifdef HEAP_PART_CACHED
#ifdef CONFIG_SOF_ZEPHYR_HEAP_CACHED
&heap_cached_part,
#endif
&heap_part
&heap_part,
&heap_struct_part
};

tr_dbg(&userspace_proxy_tr, "Common partition %#lx + %zx, attr = %u",
Expand Down Expand Up @@ -382,7 +401,7 @@ static int userspace_proxy_start_agent(struct userspace_context *user_ctx,
}

int userspace_proxy_create(struct userspace_context **user_ctx, const struct comp_driver *drv,
const struct sof_man_module *manifest, system_agent_start_fn start_fn,
const struct sof_man_module *manifest, system_agent_start_fn agent_fn,
const struct system_agent_params *agent_params,
const void **agent_interface, const struct module_interface **ops)
{
Expand Down Expand Up @@ -410,15 +429,20 @@ int userspace_proxy_create(struct userspace_context **user_ctx, const struct com
if (ret)
goto error_dom;

ret = userspace_proxy_add_sections(context, agent_params->instance_id, manifest);
if (agent_fn)
ret = userspace_proxy_add_sections(context, agent_params->instance_id, manifest);
else
/* llext modules do not use the system agent. */
ret = llext_manager_add_domain(agent_params->module_id, domain);
Comment on lines +432 to +436
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agent_fn is explicitly allowed to be NULL (llext path), but userspace_proxy_start_agent() is still called unconditionally with agent_fn. This can lead to a NULL function-pointer call unless userspace_proxy_start_agent() internally guards it. Consider skipping userspace_proxy_start_agent() entirely when agent_fn == NULL and ensuring any required agent_interface/ops setup for llext is handled in the llext path.

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if (ret)
goto error_dom;

ret = user_work_item_init(context, drv->user_heap);
if (ret)
goto error_dom;

ret = userspace_proxy_start_agent(context, start_fn, agent_params, agent_interface);
ret = userspace_proxy_start_agent(context, agent_fn, agent_params, agent_interface);
if (ret) {
tr_err(&userspace_proxy_tr, "System agent failed with error %d.", ret);
goto error_work_item;
Comment on lines +445 to 448
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agent_fn is explicitly allowed to be NULL (llext path), but userspace_proxy_start_agent() is still called unconditionally with agent_fn. This can lead to a NULL function-pointer call unless userspace_proxy_start_agent() internally guards it. Consider skipping userspace_proxy_start_agent() entirely when agent_fn == NULL and ensuring any required agent_interface/ops setup for llext is handled in the llext path.

Suggested change
ret = userspace_proxy_start_agent(context, agent_fn, agent_params, agent_interface);
if (ret) {
tr_err(&userspace_proxy_tr, "System agent failed with error %d.", ret);
goto error_work_item;
if (agent_fn) {
ret = userspace_proxy_start_agent(context, agent_fn, agent_params, agent_interface);
if (ret) {
tr_err(&userspace_proxy_tr, "System agent failed with error %d.", ret);
goto error_work_item;
}

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Expand Down
4 changes: 3 additions & 1 deletion src/include/module/module/llext.h
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
#ifndef MODULE_LLEXT_H
#define MODULE_LLEXT_H

#define SOF_LLEXT_MODULE_MANIFEST(manifest_name, entry, affinity, mod_uuid, instances) \
#define SOF_LLEXT_MODULE_MANIFEST(manifest_name, entry, affinity, mod_uuid, instances, ...) \
{ \
.module = { \
.name = manifest_name, \
Expand All @@ -16,6 +16,8 @@
.type = { \
.load_type = SOF_MAN_MOD_TYPE_LLEXT, \
.domain_ll = 1, \
.user_mode = COND_CODE_0(NUM_VA_ARGS_LESS_1(_, ##__VA_ARGS__), (0), \
(GET_ARG_N(1, __VA_ARGS__))), \
}, \
.affinity_mask = (affinity), \
} \
Expand Down
23 changes: 12 additions & 11 deletions src/library_manager/lib_manager.c
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Original file line number Diff line number Diff line change
Expand Up @@ -543,12 +543,14 @@ static int lib_manager_start_agent(const struct comp_driver *drv,
return ret;
}
#endif /* CONFIG_SOF_USERSPACE_PROXY */
if (agent) {
ret = agent(&agent_params, agent_interface);
if (ret)
tr_err(&lib_manager_tr, "System agent start failed %d!", ret);
return ret;
}

ret = agent(&agent_params, agent_interface);
if (ret)
tr_err(&lib_manager_tr, "System agent start failed %d!", ret);

return ret;
return 0;
}

enum buildinfo_mod_type { MOD_TYPE_INVALID, MOD_TYPE_IADK, MOD_TYPE_LMDK, MOD_TYPE_LLEXT };
Expand Down Expand Up @@ -654,6 +656,7 @@ static struct comp_dev *lib_manager_module_create(const struct comp_driver *drv,
case MOD_TYPE_LLEXT:
agent = NULL;
ops = (const struct module_interface *)module_entry_point;
agent_iface = NULL;
break;
case MOD_TYPE_LMDK:
agent = &native_system_agent_start;
Expand All @@ -671,12 +674,10 @@ static struct comp_dev *lib_manager_module_create(const struct comp_driver *drv,
}

/* At this point module resources are allocated and it is moved to L2 memory. */
if (agent) {
ret = lib_manager_start_agent(drv, config, mod, args, module_entry_point, agent,
agent_iface, &userspace, &ops);
if (ret)
goto err;
}
ret = lib_manager_start_agent(drv, config, mod, args, module_entry_point, agent,
agent_iface, &userspace, &ops);
if (ret)
goto err;

if (comp_set_adapter_ops(drv, ops) < 0)
goto err;
Expand Down
1 change: 1 addition & 0 deletions tools/rimage/src/manifest.c
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Original file line number Diff line number Diff line change
Expand Up @@ -212,6 +212,7 @@ static void man_get_section_manifest(struct image *image,
man_module->type.domain_dp = sof_mod->module.type.domain_dp;
man_module->type.domain_ll = sof_mod->module.type.domain_ll;
man_module->type.load_type = sof_mod->module.type.load_type;
man_module->type.user_mode = sof_mod->module.type.user_mode;

/* text segment */
segment = &man_module->segment[SOF_MAN_SEGMENT_TEXT];
Expand Down
10 changes: 7 additions & 3 deletions zephyr/lib/fast-get.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,7 +150,11 @@ const void *fast_get(struct k_heap *heap, const void *dram_ptr, size_t size)
alloc_align = PLATFORM_DCACHE_ALIGN;
}

if (size > FAST_GET_MAX_COPY_SIZE || !IS_ENABLED(CONFIG_USERSPACE))
if (size > FAST_GET_MAX_COPY_SIZE || !IS_ENABLED(CONFIG_USERSPACE) ||
/* The module driver heap is shared by all instances of a given module.
* Instances can share the allocated buffer.
*/
IS_ENABLED(CONFIG_SOF_USERSPACE_USE_DRIVER_HEAP))
alloc_ptr = dram_ptr;
else
/* When userspace is enabled only share large buffers */
Expand Down Expand Up @@ -183,8 +187,8 @@ const void *fast_get(struct k_heap *heap, const void *dram_ptr, size_t size)
ret = entry->sram_ptr;

#if CONFIG_USERSPACE
/* We only get there for large buffers */
if (k_current_get()->mem_domain_info.mem_domain->num_partitions > 1) {
/* We only get there for large buffers or module driver heap is in use */
if (k_current_get()->base.user_options & K_USER && size > FAST_GET_MAX_COPY_SIZE) {
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The comment states this branch applies to 'large buffers or module driver heap is in use', but the condition only gates on size > FAST_GET_MAX_COPY_SIZE. If the driver-heap configuration is intended to share buffers across userspace instances independent of size, the condition should incorporate CONFIG_SOF_USERSPACE_USE_DRIVER_HEAP (or the comment should be corrected). As written, the driver-heap case is ignored by this userspace-thread path.

Suggested change
if (k_current_get()->base.user_options & K_USER && size > FAST_GET_MAX_COPY_SIZE) {
if ((k_current_get()->base.user_options & K_USER) &&
(size > FAST_GET_MAX_COPY_SIZE ||
IS_ENABLED(CONFIG_SOF_USERSPACE_USE_DRIVER_HEAP))) {

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/* A userspace thread makes the request */
if (k_current_get() != entry->thread &&
!fast_get_domain_exists(k_current_get(), ret,
Expand Down
2 changes: 0 additions & 2 deletions zephyr/lib/userspace_helper.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,6 @@
#include <sof/lib/dai.h>
#include <sof/lib/dma.h>

#define MODULE_DRIVER_HEAP_CACHED CONFIG_SOF_ZEPHYR_HEAP_CACHED

/* Zephyr includes */
#include <zephyr/kernel.h>
#include <zephyr/app_memory/app_memdomain.h>
Expand Down
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