mirror of https://github.com/hak5/openwrt.git
210 lines
6.8 KiB
Diff
210 lines
6.8 KiB
Diff
From 60ee5b21ce14a7d5c269115b0751b904d0e005ed Mon Sep 17 00:00:00 2001
|
|
From: Marek Szyprowski <m.szyprowski@samsung.com>
|
|
Date: Fri, 28 Feb 2014 14:42:47 +0100
|
|
Subject: [PATCH 049/182] drivers: of: add initialization code for static
|
|
reserved memory
|
|
|
|
This patch adds support for static (defined by 'reg' property) reserved
|
|
memory regions declared in device tree.
|
|
|
|
Memory blocks can be reliably reserved only during early boot. This must
|
|
happen before the whole memory management subsystem is initialized,
|
|
because we need to ensure that the given contiguous blocks are not yet
|
|
allocated by kernel. Also it must happen before kernel mappings for the
|
|
whole low memory are created, to ensure that there will be no mappings
|
|
(for reserved blocks). Typically, all this happens before device tree
|
|
structures are unflattened, so we need to get reserved memory layout
|
|
directly from fdt.
|
|
|
|
Based on previous code provided by Josh Cartwright <joshc@codeaurora.org>
|
|
|
|
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
|
|
Signed-off-by: Grant Likely <grant.likely@linaro.org>
|
|
---
|
|
drivers/of/fdt.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++
|
|
include/linux/of_fdt.h | 4 ++
|
|
2 files changed, 135 insertions(+)
|
|
|
|
--- a/drivers/of/fdt.c
|
|
+++ b/drivers/of/fdt.c
|
|
@@ -15,6 +15,7 @@
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
+#include <linux/sizes.h>
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
@@ -440,6 +441,118 @@ struct boot_param_header *initial_boot_p
|
|
#ifdef CONFIG_OF_EARLY_FLATTREE
|
|
|
|
/**
|
|
+ * res_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;
|
|
+ unsigned long len;
|
|
+ __be32 *prop;
|
|
+ int 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 (base && size &&
|
|
+ early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
|
|
+ pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
|
|
+ uname, &base, (unsigned long)size / SZ_1M);
|
|
+ else
|
|
+ pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
|
|
+ uname, &base, (unsigned long)size / SZ_1M);
|
|
+
|
|
+ len -= t_len;
|
|
+ }
|
|
+ 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 __reserved_mem_check_root(unsigned long node)
|
|
+{
|
|
+ __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(unsigned long node, const char *uname,
|
|
+ int depth, void *data)
|
|
+{
|
|
+ static int found;
|
|
+ const char *status;
|
|
+
|
|
+ if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
|
|
+ if (__reserved_mem_check_root(node) != 0) {
|
|
+ pr_err("Reserved memory: unsupported node format, ignoring\n");
|
|
+ /* break scan */
|
|
+ return 1;
|
|
+ }
|
|
+ found = 1;
|
|
+ /* scan next node */
|
|
+ return 0;
|
|
+ } else if (!found) {
|
|
+ /* scan next node */
|
|
+ return 0;
|
|
+ } else if (found && depth < 2) {
|
|
+ /* scanning of /reserved-memory has been finished */
|
|
+ return 1;
|
|
+ }
|
|
+
|
|
+ status = of_get_flat_dt_prop(node, "status", NULL);
|
|
+ if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
|
|
+ return 0;
|
|
+
|
|
+ __reserved_mem_reserve_reg(node, uname);
|
|
+
|
|
+ /* scan next node */
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * early_init_fdt_scan_reserved_mem() - create reserved memory regions
|
|
+ *
|
|
+ * This function grabs memory from early allocator for device exclusive use
|
|
+ * defined in device tree structures. It should be called by arch specific code
|
|
+ * once the early allocator (i.e. memblock) has been fully activated.
|
|
+ */
|
|
+void __init early_init_fdt_scan_reserved_mem(void)
|
|
+{
|
|
+ of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
|
|
+}
|
|
+
|
|
+/**
|
|
* of_scan_flat_dt - scan flattened tree blob and call callback on each.
|
|
* @it: callback function
|
|
* @data: context data pointer
|
|
@@ -859,6 +972,16 @@ void __init __weak early_init_dt_add_mem
|
|
memblock_add(base, size);
|
|
}
|
|
|
|
+int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
|
|
+ phys_addr_t size, bool nomap)
|
|
+{
|
|
+ if (memblock_is_region_reserved(base, size))
|
|
+ return -EBUSY;
|
|
+ if (nomap)
|
|
+ return memblock_remove(base, size);
|
|
+ return memblock_reserve(base, size);
|
|
+}
|
|
+
|
|
/*
|
|
* called from unflatten_device_tree() to bootstrap devicetree itself
|
|
* Architectures can override this definition if memblock isn't used
|
|
@@ -867,6 +990,14 @@ void * __init __weak early_init_dt_alloc
|
|
{
|
|
return __va(memblock_alloc(size, align));
|
|
}
|
|
+#else
|
|
+int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
|
|
+ phys_addr_t size, bool nomap)
|
|
+{
|
|
+ pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n",
|
|
+ base, size, nomap ? " (nomap)" : "");
|
|
+ return -ENOSYS;
|
|
+}
|
|
#endif
|
|
|
|
bool __init early_init_dt_scan(void *params)
|
|
--- a/include/linux/of_fdt.h
|
|
+++ b/include/linux/of_fdt.h
|
|
@@ -98,7 +98,10 @@ extern int early_init_dt_scan_chosen(uns
|
|
int depth, void *data);
|
|
extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
|
|
int depth, void *data);
|
|
+extern void early_init_fdt_scan_reserved_mem(void);
|
|
extern void early_init_dt_add_memory_arch(u64 base, u64 size);
|
|
+extern int early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
|
|
+ bool no_map);
|
|
extern void * early_init_dt_alloc_memory_arch(u64 size, u64 align);
|
|
extern u64 dt_mem_next_cell(int s, __be32 **cellp);
|
|
|
|
@@ -118,6 +121,7 @@ extern void unflatten_and_copy_device_tr
|
|
extern void early_init_devtree(void *);
|
|
extern void early_get_first_memblock_info(void *, phys_addr_t *);
|
|
#else /* CONFIG_OF_FLATTREE */
|
|
+static inline void early_init_fdt_scan_reserved_mem(void) {}
|
|
static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
|
|
static inline void unflatten_device_tree(void) {}
|
|
static inline void unflatten_and_copy_device_tree(void) {}
|