[PATCH v3 1/1] cmd: bootefi: Parse reserved-memory node from DT

* [PATCH v3 1/1] cmd: bootefi: Parse reserved-memory node from DT
@ 2020-03-15 12:03 Heinrich Schuchardt
  2020-03-17  8:06 ` Patrick DELAUNAY
  0 siblings, 1 reply; 4+ messages in thread
From: Heinrich Schuchardt @ 2020-03-15 12:03 UTC (permalink / raw)
  To: u-boot

From: Atish Patra <atish.patra@wdc.com>

Currently, bootefi only parses memory reservation block to setup
EFI reserved memory mappings. However, it doesn't parse the
reserved-memory[1] device tree node that also can contain the
reserved memory regions.

Add capability to parse reserved-memory node and update the EFI memory
mappings accordingly.

1. <U-Boot source>/doc/device-tree-bindings/reserved-memory/reserved-memory.txt]

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Fix an endless loop.

The /reserved-memory node may have children without reg property. Remove
a superfluous debug statement.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---
 cmd/bootefi.c | 43 ++++++++++++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 24fc42ae89..b5b9d88273 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -149,6 +149,20 @@ done:
 	return ret;
 }

+static void efi_reserve_memory(u64 addr, u64 size)
+{
+	u64 pages;
+
+	/* Convert from sandbox address space. */
+	addr = (uintptr_t)map_sysmem(addr, 0);
+	pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
+	addr &= ~EFI_PAGE_MASK;
+	if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
+			       false) != EFI_SUCCESS)
+		printf("Reserved memory mapping failed addr %llx size %llx\n",
+		       addr, size);
+}
+
 /**
  * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
  *
@@ -161,7 +175,8 @@ done:
 static void efi_carve_out_dt_rsv(void *fdt)
 {
 	int nr_rsv, i;
-	uint64_t addr, size, pages;
+	u64 addr, size;
+	int nodeoffset, subnode;

 	nr_rsv = fdt_num_mem_rsv(fdt);

@@ -169,15 +184,25 @@ static void efi_carve_out_dt_rsv(void *fdt)
 	for (i = 0; i < nr_rsv; i++) {
 		if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
 			continue;
+		efi_reserve_memory(addr, size);
+	}

-		/* Convert from sandbox address space. */
-		addr = (uintptr_t)map_sysmem(addr, 0);
-
-		pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
-		addr &= ~EFI_PAGE_MASK;
-		if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
-				       false) != EFI_SUCCESS)
-			printf("FDT memrsv map %d: Failed to add to map\n", i);
+	/* process reserved-memory */
+	nodeoffset = fdt_subnode_offset(fdt, 0, "reserved-memory");
+	if (nodeoffset >= 0) {
+		subnode = fdt_first_subnode(fdt, nodeoffset);
+		while (subnode >= 0) {
+			/* check if this subnode has a reg property */
+			addr = fdtdec_get_addr_size(fdt, subnode, "reg",
+						    (fdt_size_t *)&size);
+			/*
+			 * The /reserved-memory node may have children with
+			 * a size instead of a reg property.
+			 */
+			if (addr != FDT_ADDR_T_NONE)
+				efi_reserve_memory(addr, size);
+			subnode = fdt_next_subnode(fdt, subnode);
+		}
 	}
 }

--
2.25.1

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