mm: intel_adsp_mtl_tlb: suppress sparse address space warnings

There are various call to z_soc_cached_ptr() which returns values
in the cached address space and are stored in temporary variables
that are not marked as in the cached address space. This results
in sparse complaining about discarding the cached address space
attribute. These temporary variables are then passed to other
internal memory management related functions which do not have
the concept of cached address space (as it is currently Xtensa
specific). Because of this, we cannot change the signature of
these functions. Instead, we force a change of address space
when those temporary variables are being assigned to suppress
sparse warnings.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

drivers/mm/mm_drv_intel_adsp_mtl_tlb.c

@@ -23,6 +23,7 @@
 #include "mm_drv_intel_adsp.h"
 
 #include <zephyr/drivers/mm/mm_drv_intel_adsp_mtl_tlb.h>
+#include <zephyr/debug/sparse.h>
 
 static struct k_spinlock tlb_lock;
 extern struct k_spinlock sys_mm_drv_common_lock;
@@ -290,7 +291,7 @@ int sys_mm_drv_map_region(void *virt, uintptr_t phys,
 		goto out;
 	}
 
-	va = (uint8_t *)z_soc_cached_ptr(virt);
+	va = (__sparse_force uint8_t *)z_soc_cached_ptr(virt);
 	pa = phys;
 
 	key = k_spin_lock(&sys_mm_drv_common_lock);
@@ -318,7 +319,7 @@ int sys_mm_drv_map_region(void *virt, uintptr_t phys,
 int sys_mm_drv_map_array(void *virt, uintptr_t *phys,
 			 size_t cnt, uint32_t flags)
 {
-	void *va = z_soc_cached_ptr(virt);
+	void *va = (__sparse_force void *)z_soc_cached_ptr(virt);
 
 	return sys_mm_drv_simple_map_array(va, phys, cnt, flags);
 }
@@ -387,7 +388,7 @@ int sys_mm_drv_unmap_page(void *virt)
 
 int sys_mm_drv_unmap_region(void *virt, size_t size)
 {
-	void *va = z_soc_cached_ptr(virt);
+	void *va = (__sparse_force void *)z_soc_cached_ptr(virt);
 
 	return sys_mm_drv_simple_unmap_region(va, size);
 }
@@ -478,8 +479,8 @@ int sys_mm_drv_page_flag_get(void *virt, uint32_t *flags)
 int sys_mm_drv_remap_region(void *virt_old, size_t size,
 			    void *virt_new)
 {
-	void *va_new = z_soc_cached_ptr(virt_new);
-	void *va_old = z_soc_cached_ptr(virt_old);
+	void *va_new = (__sparse_force void *)z_soc_cached_ptr(virt_new);
+	void *va_old = (__sparse_force void *)z_soc_cached_ptr(virt_old);
 
 	return sys_mm_drv_simple_remap_region(va_old, size, va_new);
 }
@@ -491,8 +492,8 @@ int sys_mm_drv_move_region(void *virt_old, size_t size, void *virt_new,
 	size_t offset;
 	int ret = 0;
 
-	virt_new = z_soc_cached_ptr(virt_new);
-	virt_old = z_soc_cached_ptr(virt_old);
+	virt_new = (__sparse_force void *)z_soc_cached_ptr(virt_new);
+	virt_old = (__sparse_force void *)z_soc_cached_ptr(virt_old);
 
 	CHECKIF(!sys_mm_drv_is_virt_addr_aligned(virt_old) ||
 		!sys_mm_drv_is_virt_addr_aligned(virt_new) ||
@@ -589,8 +590,8 @@ int sys_mm_drv_move_array(void *virt_old, size_t size, void *virt_new,
 {
 	int ret;
 
-	void *va_new = z_soc_cached_ptr(virt_new);
-	void *va_old = z_soc_cached_ptr(virt_old);
+	void *va_new = (__sparse_force void *)z_soc_cached_ptr(virt_new);
+	void *va_old = (__sparse_force void *)z_soc_cached_ptr(virt_old);
 
 	ret = sys_mm_drv_simple_move_array(va_old, size, va_new,
 					    phys_new, phys_cnt);
@@ -766,7 +767,8 @@ __imr void adsp_mm_restore_context(void *storage_buffer)
 
 	while (phys_addr != 0) {
 		uint32_t phys_addr_uncached =
-				POINTER_TO_UINT(z_soc_uncached_ptr(UINT_TO_POINTER(phys_addr)));
+				POINTER_TO_UINT(z_soc_uncached_ptr(
+					(void __sparse_cache *)UINT_TO_POINTER(phys_addr)));
 		uint32_t phys_offset = phys_addr - L2_SRAM_BASE;
 		uint32_t bank_idx = (phys_offset / SRAM_BANK_SIZE);