Re: [Xen-devel] [PATCH RFC 21/35] xen/arm: Create memory node for DOM0

[Julien Grall]

Hi Stefano,

On 06/02/2015 00:01, Stefano Stabellini wrote:
On Wed, 4 Feb 2015, parth.di...@linaro.org wrote:
From: Naresh Bhat <naresh.b...@linaro.org>
Create a memory node for DOM0.

Signed-off-by: Naresh Bhat <naresh.b...@linaro.org>
---
  xen/arch/arm/domain_build.c | 48 +++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 48 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index bb7f043..30bebe5 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1155,6 +1155,50 @@ static int handle_node(struct domain *d, struct 
kernel_info *kinfo,
      return res;
  }

+static int make_memory_node_acpi(const struct domain *d,
+                            void *fdt,
+                            int addr_cells,
+                            int size_cells,
+                            const struct kernel_info *kinfo)
+{
+    int res, i;
+    int reg_size = addr_cells + size_cells;
+    int nr_cells = reg_size*kinfo->mem.nr_banks;
+    __be32 reg[nr_cells];
+    __be32 *cells;
+
+    DPRINT("Create memory node (reg size %d, nr cells %d)\n", reg_size, 
nr_cells);
+
+    /* ePAPR 3.4 */
+    res = fdt_begin_node(fdt, "memory");
+    if ( res )
+        return res;
+
+    res = fdt_property_string(fdt, "device_type", "memory");
+    if ( res )
+        return res;
+
+    cells = &reg[0];
+    for ( i = 0 ; i < kinfo->mem.nr_banks; i++ )
+    {
+        u64 start = kinfo->mem.bank[i].start;
+        u64 size = kinfo->mem.bank[i].size;
+
+        DPRINT("  Bank %d: %#"PRIx64"->%#"PRIx64"\n",
+                i, start, start + size);
+
+        dt_set_range(&cells, fdt, start, size);
+    }
+
+    res = fdt_property(fdt, "reg", reg, sizeof(reg));
+    if ( res )
+        return res;
+
+    res = fdt_end_node(fdt);
+
+    return res;
+}

What's the difference with make_memory_node?  Couldn't you just use that
instead?

AFAICS, the only difference is the way we get the number of address/size 
cells.

I agree that we should extend make_memory_node to get those number of 
cells in parameter rather than duplicating the function.

Regards,

--
Julien Grall

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