Hi Penny,
On 18/05/2021 06:21, Penny Zheng wrote:
static memory regions overlap with memory nodes. The
overlapping memory is reserved-memory and should be
handled accordingly:
dt_unreserved_regions should skip these regions the
same way they are already skipping mem-reserved regions.
Signed-off-by: Penny Zheng
---
xen/arch/arm/setup.c | 39 +--
1 file changed, 33 insertions(+), 6 deletions(-)
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 00aad1c194..444dbbd676 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -201,7 +201,7 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t
e,
void (*cb)(paddr_t, paddr_t),
int first)
{
-int i, nr = fdt_num_mem_rsv(device_tree_flattened);
+int i, nr_reserved, nr_static, nr = fdt_num_mem_rsv(device_tree_flattened);
for ( i = first; i < nr ; i++ )
{
@@ -222,18 +222,45 @@ static void __init dt_unreserved_regions(paddr_t s,
paddr_t e,
}
/*
- * i is the current bootmodule we are evaluating across all possible
- * kinds.
+ * i is the current reserved RAM banks we are evaluating across all
+ * possible kinds.
*
* When retrieving the corresponding reserved-memory addresses
* below, we need to index the bootinfo.reserved_mem bank starting
* from 0, and only counting the reserved-memory modules. Hence,
* we need to use i - nr.
*/
-for ( ; i - nr < bootinfo.reserved_mem.nr_banks; i++ )
+i = i - nr;
+nr_reserved = bootinfo.reserved_mem.nr_banks;
+for ( ; i < nr_reserved; i++ )
{
-paddr_t r_s = bootinfo.reserved_mem.bank[i - nr].start;
-paddr_t r_e = r_s + bootinfo.reserved_mem.bank[i - nr].size;
+paddr_t r_s = bootinfo.reserved_mem.bank[i].start;
+paddr_t r_e = r_s + bootinfo.reserved_mem.bank[i].size;
+
+if ( s < r_e && r_s < e )
+{
+dt_unreserved_regions(r_e, e, cb, i + 1);
+dt_unreserved_regions(s, r_s, cb, i + 1);
+return;
+}
+}
+
+/*
+ * i is the current reserved RAM banks we are evaluating across all
+ * possible kinds.
+ *
+ * When retrieving the corresponding static-memory bank address
+ * below, we need to index the bootinfo.static_mem starting
+ * from 0, and only counting the static-memory bank. Hence,
+ * we need to use i - nr_reserved.
+ */
+
+i = i - nr_reserved;
+nr_static = bootinfo.static_mem.nr_banks;
+for ( ; i < nr_static; i++ )
+{
+paddr_t r_s = bootinfo.static_mem.bank[i].start; > +paddr_t
r_e = r_s + bootinfo.static_mem.bank[i].size;
This is the 3rd loop we are adding in dt_unreserved_regions(). Each loop
are doing pretty much the same thing except with a different array. I'd
like to avoid the new loop if possible.
As mentionned in patch#1, the static memory is another kind of reserved
memory. So could we describe the static memory using the reserved-memory?
if ( s < r_e && r_s < e )
{
Cheers,
--
Julien Grall
