[kvm-unit-tests PATCH v1 07/18] lib/alloc_phys: Add callback to perform cache maintenance

Shaoqin Huang
2023-11-30T09:07:59Z

Some architectures, like arm and arm64, require explicit cache maintenance
to maintain the caches in sync with memory when toggling the caches. Add
the function to do the required maintenance on the internal structures that
the allocator maintains.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
lib/alloc_phys.c | 8 ++++++++
lib/alloc_phys.h | 8 ++++++++
2 files changed, 16 insertions(+)

diff --git a/lib/alloc_phys.c b/lib/alloc_phys.c
index c96bcb48..5d5487f2 100644
--- a/lib/alloc_phys.c
+++ b/lib/alloc_phys.c
@@ -45,6 +45,14 @@ void phys_alloc_set_minimum_alignment(phys_addr_t align)
align_min = align;
}

+void phys_alloc_perform_cache_maintenance(cache_maint_fn maint_fn)
+{
+ maint_fn((unsigned long)&base);
+ maint_fn((unsigned long)&used);
+ maint_fn((unsigned long)&top);
+ maint_fn((unsigned long)&align_min);
+}
+
static void *memalign_early(size_t alignment, size_t sz)
{
phys_addr_t align = (phys_addr_t)alignment;
diff --git a/lib/alloc_phys.h b/lib/alloc_phys.h
index 4d350f01..86b3d021 100644
--- a/lib/alloc_phys.h
+++ b/lib/alloc_phys.h
@@ -15,6 +15,8 @@
*/
#include "libcflat.h"

+typedef void (*cache_maint_fn)(unsigned long addr);
+
/*
* phys_alloc_init creates the initial free memory region of size @size
* at @base. The minimum alignment is set to DEFAULT_MINIMUM_ALIGNMENT.
@@ -27,6 +29,12 @@ extern void phys_alloc_init(phys_addr_t base, phys_addr_t size);
*/
extern void phys_alloc_set_minimum_alignment(phys_addr_t align);

+/*
+ * Perform cache maintenance on the internal structures that the physical
+ * allocator maintains.
+ */
+extern void phys_alloc_perform_cache_maintenance(cache_maint_fn maint_fn);
+
/*
* phys_alloc_show outputs all currently allocated regions with the
* following format, where <end_addr> is non-inclusive:
--
2.40.1