of: Move all FDT reserved-memory handling into of_reserved_mem.c

The split of /reserved-memory handling between fdt.c and
of_reserved_mem.c makes for reading and restructuring the code
difficult. As of_reserved_mem.c is only built for
CONFIG_OF_EARLY_FLATTREE already, move all the code to one spot.

Acked-by: Saravana Kannan <saravanak@google.com>
Reviewed-by: Oreoluwa Babatunde <quic_obabatun@quicinc.com>
Link: https://lore.kernel.org/r/20240311181303.1516514-2-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 1 insertions, 122 deletions

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index e5a385285149..a8a04f27915b 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -17,7 +17,6 @@
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
-#include <linux/of_reserved_mem.h>
 #include <linux/sizes.h>
 #include <linux/string.h>
 #include <linux/errno.h>
@@ -88,7 +87,7 @@ void __init of_fdt_limit_memory(int limit)
 	}
 }
 
-static bool of_fdt_device_is_available(const void *blob, unsigned long node)
+bool of_fdt_device_is_available(const void *blob, unsigned long node)
 {
 	const char *status = fdt_getprop(blob, node, "status", NULL);
 
@@ -484,126 +483,6 @@ void *initial_boot_params __ro_after_init;
 
 static u32 of_fdt_crc32;
 
-static int __init early_init_dt_reserve_memory(phys_addr_t base,
-					       phys_addr_t size, bool nomap)
-{
-	if (nomap) {
-		/*
-		 * If the memory is already reserved (by another region), we
-		 * should not allow it to be marked nomap, but don't worry
-		 * if the region isn't memory as it won't be mapped.
-		 */
-		if (memblock_overlaps_region(&memblock.memory, base, size) &&
-		    memblock_is_region_reserved(base, size))
-			return -EBUSY;
-
-		return memblock_mark_nomap(base, size);
-	}
-	return memblock_reserve(base, size);
-}
-
-/*
- * __reserved_mem_reserve_reg() - reserve all memory described in 'reg' property
- */
-static int __init __reserved_mem_reserve_reg(unsigned long node,
-					     const char *uname)
-{
-	int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
-	phys_addr_t base, size;
-	int len;
-	const __be32 *prop;
-	int first = 1;
-	bool nomap;
-
-	prop = of_get_flat_dt_prop(node, "reg", &len);
-	if (!prop)
-		return -ENOENT;
-
-	if (len && len % t_len != 0) {
-		pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
-		       uname);
-		return -EINVAL;
-	}
-
-	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
-
-	while (len >= t_len) {
-		base = dt_mem_next_cell(dt_root_addr_cells, &prop);
-		size = dt_mem_next_cell(dt_root_size_cells, &prop);
-
-		if (size &&
-		    early_init_dt_reserve_memory(base, size, nomap) == 0)
-			pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %lu MiB\n",
-				uname, &base, (unsigned long)(size / SZ_1M));
-		else
-			pr_err("Reserved memory: failed to reserve memory for node '%s': base %pa, size %lu MiB\n",
-			       uname, &base, (unsigned long)(size / SZ_1M));
-
-		len -= t_len;
-		if (first) {
-			fdt_reserved_mem_save_node(node, uname, base, size);
-			first = 0;
-		}
-	}
-	return 0;
-}
-
-/*
- * __reserved_mem_check_root() - check if #size-cells, #address-cells provided
- * in /reserved-memory matches the values supported by the current implementation,
- * also check if ranges property has been provided
- */
-static int __init __reserved_mem_check_root(unsigned long node)
-{
-	const __be32 *prop;
-
-	prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
-	if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
-		return -EINVAL;
-
-	prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
-	if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
-		return -EINVAL;
-
-	prop = of_get_flat_dt_prop(node, "ranges", NULL);
-	if (!prop)
-		return -EINVAL;
-	return 0;
-}
-
-/*
- * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
- */
-static int __init fdt_scan_reserved_mem(void)
-{
-	int node, child;
-	const void *fdt = initial_boot_params;
-
-	node = fdt_path_offset(fdt, "/reserved-memory");
-	if (node < 0)
-		return -ENODEV;
-
-	if (__reserved_mem_check_root(node) != 0) {
-		pr_err("Reserved memory: unsupported node format, ignoring\n");
-		return -EINVAL;
-	}
-
-	fdt_for_each_subnode(child, fdt, node) {
-		const char *uname;
-		int err;
-
-		if (!of_fdt_device_is_available(fdt, child))
-			continue;
-
-		uname = fdt_get_name(fdt, child, NULL);
-
-		err = __reserved_mem_reserve_reg(child, uname);
-		if (err == -ENOENT && of_get_flat_dt_prop(child, "size", NULL))
-			fdt_reserved_mem_save_node(child, uname, 0, 0);
-	}
-	return 0;
-}
-
 /*
  * fdt_reserve_elfcorehdr() - reserves memory for elf core header
  *