diff options
Diffstat (limited to 'target/linux/airoha/patches-6.1/0004-ARM-9124-1-uncompress-Parse-linux-usable-memory-rang.patch')
| -rw-r--r-- | target/linux/airoha/patches-6.1/0004-ARM-9124-1-uncompress-Parse-linux-usable-memory-rang.patch | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/target/linux/airoha/patches-6.1/0004-ARM-9124-1-uncompress-Parse-linux-usable-memory-rang.patch b/target/linux/airoha/patches-6.1/0004-ARM-9124-1-uncompress-Parse-linux-usable-memory-rang.patch deleted file mode 100644 index 0f0cbaa10f..0000000000 --- a/target/linux/airoha/patches-6.1/0004-ARM-9124-1-uncompress-Parse-linux-usable-memory-rang.patch +++ /dev/null @@ -1,107 +0,0 @@ -From 48342ae751c797ac73ac9c894b3f312df18ffd21 Mon Sep 17 00:00:00 2001 -From: Geert Uytterhoeven <geert+renesas@glider.be> -Date: Wed, 15 Sep 2021 13:46:20 +0100 -Subject: [PATCH] ARM: 9124/1: uncompress: Parse "linux,usable-memory-range" DT - property - -Add support for parsing the "linux,usable-memory-range" DT property. -This property is used to describe the usable memory reserved for the -crash dump kernel, and thus makes the memory reservation explicit. -If present, Linux no longer needs to mask the program counter, and rely -on the "mem=" kernel parameter to obtain the start and size of usable -memory. - -For backwards compatibility, the traditional method to derive the start -of memory is still used if "linux,usable-memory-range" is absent. - -Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> -Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> -Signed-off-by: Daniel Danzberger <daniel@dd-wrt.com> ---- - .../arm/boot/compressed/fdt_check_mem_start.c | 48 ++++++++++++++++--- - 1 file changed, 42 insertions(+), 6 deletions(-) - ---- a/arch/arm/boot/compressed/fdt_check_mem_start.c -+++ b/arch/arm/boot/compressed/fdt_check_mem_start.c -@@ -55,16 +55,17 @@ static uint64_t get_val(const fdt32_t *c - * DTB, and, if out-of-range, replace it by the real start address. - * To preserve backwards compatibility (systems reserving a block of memory - * at the start of physical memory, kdump, ...), the traditional method is -- * always used if it yields a valid address. -+ * used if it yields a valid address, unless the "linux,usable-memory-range" -+ * property is present. - * - * Return value: start address of physical memory to use - */ - uint32_t fdt_check_mem_start(uint32_t mem_start, const void *fdt) - { -- uint32_t addr_cells, size_cells, base; -+ uint32_t addr_cells, size_cells, usable_base, base; - uint32_t fdt_mem_start = 0xffffffff; -- const fdt32_t *reg, *endp; -- uint64_t size, end; -+ const fdt32_t *usable, *reg, *endp; -+ uint64_t size, usable_end, end; - const char *type; - int offset, len; - -@@ -80,6 +81,27 @@ uint32_t fdt_check_mem_start(uint32_t me - if (addr_cells > 2 || size_cells > 2) - return mem_start; - -+ /* -+ * Usable memory in case of a crash dump kernel -+ * This property describes a limitation: memory within this range is -+ * only valid when also described through another mechanism -+ */ -+ usable = get_prop(fdt, "/chosen", "linux,usable-memory-range", -+ (addr_cells + size_cells) * sizeof(fdt32_t)); -+ if (usable) { -+ size = get_val(usable + addr_cells, size_cells); -+ if (!size) -+ return mem_start; -+ -+ if (addr_cells > 1 && fdt32_ld(usable)) { -+ /* Outside 32-bit address space */ -+ return mem_start; -+ } -+ -+ usable_base = fdt32_ld(usable + addr_cells - 1); -+ usable_end = usable_base + size; -+ } -+ - /* Walk all memory nodes and regions */ - for (offset = fdt_next_node(fdt, -1, NULL); offset >= 0; - offset = fdt_next_node(fdt, offset, NULL)) { -@@ -107,7 +129,20 @@ uint32_t fdt_check_mem_start(uint32_t me - - base = fdt32_ld(reg + addr_cells - 1); - end = base + size; -- if (mem_start >= base && mem_start < end) { -+ if (usable) { -+ /* -+ * Clip to usable range, which takes precedence -+ * over mem_start -+ */ -+ if (base < usable_base) -+ base = usable_base; -+ -+ if (end > usable_end) -+ end = usable_end; -+ -+ if (end <= base) -+ continue; -+ } else if (mem_start >= base && mem_start < end) { - /* Calculated address is valid, use it */ - return mem_start; - } -@@ -123,7 +158,8 @@ uint32_t fdt_check_mem_start(uint32_t me - } - - /* -- * The calculated address is not usable. -+ * The calculated address is not usable, or was overridden by the -+ * "linux,usable-memory-range" property. - * Use the lowest usable physical memory address from the DTB instead, - * and make sure this is a multiple of 2 MiB for phys/virt patching. - */ |