Re: [Linaro-mm-sig] [PATCH v5 03/11] drivers: of: add initialization code for dynamic reserved memory

On Fri, 21 Feb 2014 13:25:19 +0100, Marek Szyprowski m.szyprowski@samsung.com wrote:

This patch adds support for dynamically allocated reserved memory regions declared in device tree. Such regions are defined by 'size', 'alignment' and 'alloc-ranges' properties.

Based on previous code provided by Josh Cartwright joshc@codeaurora.org

Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com

Acked-by: Grant Likely grant.likely@linaro.org

---

drivers/of/Kconfig | 6 ++ drivers/of/Makefile | 1 + drivers/of/fdt.c | 13 ++- drivers/of/of_reserved_mem.c | 188 +++++++++++++++++++++++++++++++++++++++ include/linux/of_reserved_mem.h | 21 +++++ 5 files changed, 227 insertions(+), 2 deletions(-) create mode 100644 drivers/of/of_reserved_mem.c create mode 100644 include/linux/of_reserved_mem.h

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index c6973f101a3e..30a7d87a8077 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -75,4 +75,10 @@ config OF_MTD depends on MTD def_bool y +config OF_RESERVED_MEM

• depends on OF_EARLY_FLATTREE
• bool
• help

•  Helpers to allow for reservation of memory regions
  

endmenu # OF diff --git a/drivers/of/Makefile b/drivers/of/Makefile index efd05102c405..ed9660adad77 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_OF_MDIO) += of_mdio.o obj-$(CONFIG_OF_PCI) += of_pci.o obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o obj-$(CONFIG_OF_MTD) += of_mtd.o +obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 12809e20ef71..eafe5805257a 100644 --- 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/of_reserved_mem.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/slab.h> @@ -449,7 +450,7 @@ static int __init __reserved_mem_reserve_reg(unsigned long node, phys_addr_t base, size; unsigned long len; __be32 *prop;

• int nomap;

• int nomap, first = 1;

prop = of_get_flat_dt_prop(node, "reg", &len); if (!prop) @@ -476,6 +477,10 @@ static int __init __reserved_mem_reserve_reg(unsigned long node, 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;

} @@ -506,6 +511,7 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, { static int found; const char *status;

• int err;

if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { if (__reserved_mem_check_root(node) != 0) { @@ -528,7 +534,9 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) return 0;

• __reserved_mem_reserve_reg(node, uname);

• err = __reserved_mem_reserve_reg(node, uname);
• if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))

• fdt_reserved_mem_save_node(node, uname, 0, 0);
  

/* scan next node */ return 0; @@ -544,6 +552,7 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, void __init early_init_fdt_scan_reserved_mem(void) { of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);

• fdt_init_reserved_mem();

} /** diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c new file mode 100644 index 000000000000..c7ca6a4a42d1 --- /dev/null +++ b/drivers/of/of_reserved_mem.c @@ -0,0 +1,188 @@ +/*

• • Device tree based initialization code for reserved memory.
• • Copyright (c) 2013, The Linux Foundation. All Rights Reserved.
• • Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.

• • http://www.samsung.com
    

• • Author: Marek Szyprowski m.szyprowski@samsung.com
• • Author: Josh Cartwright joshc@codeaurora.org
• • This program is free software; you can redistribute it and/or
• • modify it under the terms of the GNU General Public License as
• • published by the Free Software Foundation; either version 2 of the
• • License or (at your optional) any later version of the license.
• */

+#include <linux/err.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/of_platform.h> +#include <linux/mm.h> +#include <linux/sizes.h> +#include <linux/of_reserved_mem.h>

+#define MAX_RESERVED_REGIONS 16 +static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS]; +static int reserved_mem_count;

+#if defined(CONFIG_HAVE_MEMBLOCK) +#include <linux/memblock.h> +int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,

• phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
• phys_addr_t *res_base)

+{

• /*

• * We use __memblock_alloc_base() because memblock_alloc_base()
  

• * panic()s on allocation failure.
  

• */
  

• phys_addr_t base = __memblock_alloc_base(size, align, end);
• if (!base)

• return -ENOMEM;
  

• /*

• * Check if the allocated region fits in to start..end window
  

• */
  

• if (base < start) {

• memblock_free(base, size);
  

• return -ENOMEM;
  

• }
• *res_base = base;
• if (nomap)

• return memblock_remove(base, size);
  

• return 0;

+} +#else +int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,

• phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
• phys_addr_t *res_base)

+{

• pr_error("Reserved memory not supported, ignoring region 0x%llx%s\n",

•   size, nomap ? " (nomap)" : "");
  

• return -ENOSYS;

+} +#endif

+/**

• • res_mem_save_node() - save fdt node for second pass initialization
• */

+void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,

• 		      phys_addr_t base, phys_addr_t size)
  

+{

• struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
• if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {

• pr_err("Reserved memory: not enough space all defined regions.\n");
  

• return;
  

• }
• rmem->fdt_node = node;
• rmem->name = uname;
• rmem->base = base;
• rmem->size = size;
• reserved_mem_count++;
• return;

+}

+/**

• • res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'

• • 	  and 'alloc-ranges' properties
    

• */

+static int __init __reserved_mem_alloc_size(unsigned long node,

• const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)

+{

• int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
• phys_addr_t start = 0, end = 0;
• phys_addr_t base = 0, align = 0, size;
• unsigned long len;
• __be32 *prop;
• int nomap;
• int ret;
• prop = of_get_flat_dt_prop(node, "size", &len);
• if (!prop)

• return -EINVAL;
  

• if (len != dt_root_size_cells * sizeof(__be32)) {

• pr_err("Reserved memory: invalid size property in '%s' node.\n",
  

• 		uname);
  

• return -EINVAL;
  

• }
• size = dt_mem_next_cell(dt_root_size_cells, &prop);
• nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
• prop = of_get_flat_dt_prop(node, "alignment", &len);
• if (prop) {

• if (len != dt_root_addr_cells * sizeof(__be32)) {
  

• 	pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
  

• 		uname);
  

• 	return -EINVAL;
  

• }
  

• align = dt_mem_next_cell(dt_root_addr_cells, &prop);
  

• }
• prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
• if (prop) {

• if (len % t_len != 0) {
  

• 	pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
  

• 	       uname);
  

• 	return -EINVAL;
  

• }
  

• base = 0;
  

• while (len > 0) {
  

• 	start = dt_mem_next_cell(dt_root_addr_cells, &prop);
  

• 	end = start + dt_mem_next_cell(dt_root_size_cells,
  

• 				       &prop);
  

• 	ret = early_init_dt_alloc_reserved_memory_arch(size,
  

• 			align, start, end, nomap, &base);
  

• 	if (ret == 0) {
  

• 		pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
  

• 			uname, &base,
  

• 			(unsigned long)size / SZ_1M);
  

• 		break;
  

• 	}
  

• 	len -= t_len;
  

• }
  

• } else {

• ret = early_init_dt_alloc_reserved_memory_arch(size, align,
  

• 					0, 0, nomap, &base);
  

• if (ret == 0)
  

• 	pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
  

• 		uname, &base, (unsigned long)size / SZ_1M);
  

• }
• if (base == 0) {

• pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
  

• 	uname);
  

• return -ENOMEM;
  

• }
• *res_base = base;
• *res_size = size;
• return 0;

+}

+/**

• • fdt_init_reserved_mem - allocate and init all saved reserved memory regions
• */

+void __init fdt_init_reserved_mem(void) +{

• int i;
• for (i = 0; i < reserved_mem_count; i++) {

• struct reserved_mem *rmem = &reserved_mem[i];
  

• unsigned long node = rmem->fdt_node;
  

• int err = 0;
  

• if (rmem->size == 0)
  

• 	err = __reserved_mem_alloc_size(node, rmem->name,
  

• 				 &rmem->base, &rmem->size);
  

• }

+} diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h new file mode 100644 index 000000000000..89226ed7d954 --- /dev/null +++ b/include/linux/of_reserved_mem.h @@ -0,0 +1,21 @@ +#ifndef __OF_RESERVED_MEM_H +#define __OF_RESERVED_MEM_H

+struct reserved_mem {

• const char *name;
• unsigned long fdt_node;
• phys_addr_t base;
• phys_addr_t size;

+};

+#ifdef CONFIG_OF_RESERVED_MEM +void fdt_init_reserved_mem(void); +void fdt_reserved_mem_save_node(unsigned long node, const char *uname,

• 	       phys_addr_t base, phys_addr_t size);
  

+#else +static inline void fdt_init_reserved_mem(void) { } +static inline void fdt_reserved_mem_save_node(unsigned long node,

• const char *uname, phys_addr_t base, phys_addr_t size) { }
  

+#endif

+#endif /* __OF_RESERVED_MEM_H */

1.7.9.5