From: Rob Herring <robh@kernel.org>
To: Calvin Zhang <calvinzhang.cool@gmail.com>
Cc: Vineet Gupta <vgupta@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Guo Ren <guoren@kernel.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Nick Hu <nickhu@andestech.com>, Greentime Hu <green.hu@gmail.com>,
Vincent Chen <deanbo422@gmail.com>,
Dinh Nguyen <dinguyen@kernel.org>,
Jonas Bonn <jonas@southpole.se>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
Stafford Horne <shorne@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>, Rich Felker <dalias@libc.org>,
Chris Zankel <chris@zankel.net>,
Max Filippov <jcmvbkbc@gmail.com>,
Frank Rowand <frowand.list@gmail.com>,
Mike Rapoport <rppt@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Vladimir Isaev <isaev@synopsys.com>,
Arnd Bergmann <arnd@arndb.de>,
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
Wolfram Sang <wsa+renesas@sang-engineering.com>,
Guenter Roeck <linux@roeck-us.net>, Marc Zyngier <maz@kernel.org>,
David Brazdil <dbrazdil@google.com>,
Mark Rutland <mark.rutland@arm.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Souptick Joarder <jrdr.linux@gmail.com>,
Jinyang He <hejinyang@loongson.cn>,
Alexander Sverdlin <alexander.sverdlin@nokia.com>,
Serge Semin <Sergey.Semin@baikalelectronics.ru>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Ley Foon Tan <ley.foon.tan@intel.com>,
Andreas Oetken <andreas.oetken@siemens.com>,
Randy Dunlap <rdunlap@infradead.org>,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Zhang Yunkai <zhang.yunkai@zte.com.cn>,
Markus Elfring <elfring@users.sourceforge.net>,
Ganesh Goudar <ganeshgr@linux.ibm.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Atish Patra <atish.patra@wdc.com>,
Anup Patel <anup.patel@wdc.com>,
Nick Kossifidis <mick@ics.forth.gr>,
Alexandre Ghiti <alex@ghiti.fr>,
Vitaly Wool <vitaly.wool@konsulko.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Guo Ren <guoren@linux.alibaba.com>,
Tiezhu Yang <yangtiezhu@loongson.cn>,
Mauri Sandberg <sandberg@mailfence.com>,
Palmer Dabbelt <palmerdabbelt@google.com>,
linux-snps-arc@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org,
uclinux-h8-devel@lists.sourceforge.jp,
linux-mips@vger.kernel.org, openrisc@lists.librecores.org,
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devicetree@vger.kernel.org
Subject: Re: [PATCH 1/2] of: Sort reserved_mem related code
Date: Mon, 29 Nov 2021 18:01:50 -0600 [thread overview]
Message-ID: <YaVp7ubpCLN1xWfF@robh.at.kernel.org> (raw)
In-Reply-To: <20211119075844.2902592-2-calvinzhang.cool@gmail.com>
On Fri, Nov 19, 2021 at 03:58:18PM +0800, Calvin Zhang wrote:
> Move code about parsing /reserved-memory and initializing of
> reserved_mems array to of_reserved_mem.c for better modularity.
>
> Rename array name from reserved_mem to reserved_mems to distinguish
> from type definition.
>
> Signed-off-by: Calvin Zhang <calvinzhang.cool@gmail.com>
> ---
> drivers/of/fdt.c | 108 +--------------------
> drivers/of/of_private.h | 12 ++-
> drivers/of/of_reserved_mem.c | 163 ++++++++++++++++++++++++++------
> include/linux/of_reserved_mem.h | 4 +
> 4 files changed, 149 insertions(+), 138 deletions(-)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index bdca35284ceb..445af4e69300 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -80,7 +80,7 @@ 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);
>
> @@ -476,7 +476,7 @@ void *initial_boot_params __ro_after_init;
>
> static u32 of_fdt_crc32;
>
> -static int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
> +int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
> phys_addr_t size, bool nomap)
I think you can move this function too if you change the nomap==false
callers to just call memblock_reserve directly.
> {
> if (nomap) {
> @@ -492,108 +492,6 @@ static int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
> 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_arch(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_info("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
> *
> @@ -642,7 +540,7 @@ void __init early_init_fdt_scan_reserved_mem(void)
> }
>
> fdt_scan_reserved_mem();
> - fdt_init_reserved_mem();
> + of_reserved_mem_init();
> fdt_reserve_elfcorehdr();
> }
>
> diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
> index 9324483397f6..88b67f8ed698 100644
> --- a/drivers/of/of_private.h
> +++ b/drivers/of/of_private.h
> @@ -163,8 +163,14 @@ static inline int of_dma_get_range(struct device_node *np,
> }
> #endif
>
> -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);
> +bool of_fdt_device_is_available(const void *blob, unsigned long node);
> +int early_init_dt_reserve_memory_arch(phys_addr_t base,
> + phys_addr_t size, bool nomap);
> +#ifdef CONFIG_OF_RESERVED_MEM
> +int fdt_scan_reserved_mem(void);
> +#else
> +static inline int fdt_scan_reserved_mem(void) { }
> +#endif
> +
>
> #endif /* _LINUX_OF_PRIVATE_H */
> diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> index 9c0fb962c22b..784cfc5cd251 100644
> --- a/drivers/of/of_reserved_mem.c
> +++ b/drivers/of/of_reserved_mem.c
> @@ -20,13 +20,14 @@
> #include <linux/of_reserved_mem.h>
> #include <linux/sort.h>
> #include <linux/slab.h>
> +#include <linux/libfdt.h>
> #include <linux/memblock.h>
> #include <linux/kmemleak.h>
>
> #include "of_private.h"
>
> #define MAX_RESERVED_REGIONS 64
> -static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
> +static struct reserved_mem reserved_mems[MAX_RESERVED_REGIONS];
Would be a bit easier to review without the rename.
> static int reserved_mem_count;
>
> static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
> @@ -56,12 +57,12 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
> /*
> * fdt_reserved_mem_save_node() - save fdt node for second pass initialization
> */
> -void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
> +static 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];
> + struct reserved_mem *rmem = &reserved_mems[reserved_mem_count];
>
> - if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
> + if (reserved_mem_count == ARRAY_SIZE(reserved_mems)) {
> pr_err("not enough space for all defined regions.\n");
> return;
> }
> @@ -173,29 +174,105 @@ static const struct of_device_id __rmem_of_table_sentinel
> __used __section("__reservedmem_of_table_end");
>
> /*
> - * __reserved_mem_init_node() - call region specific reserved memory init code
> + * __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_init_node(struct reserved_mem *rmem)
> +static int __init __reserved_mem_check_root(unsigned long node)
> {
> - extern const struct of_device_id __reservedmem_of_table[];
> - const struct of_device_id *i;
> - int ret = -ENOENT;
> + const __be32 *prop;
>
> - for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
> - reservedmem_of_init_fn initfn = i->data;
> - const char *compat = i->compatible;
> + prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
> + if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
> + return -EINVAL;
>
> - if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
> - continue;
> + prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
> + if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
> + return -EINVAL;
>
> - ret = initfn(rmem);
> - if (ret == 0) {
> - pr_info("initialized node %s, compatible id %s\n",
> - rmem->name, compat);
> - break;
> + prop = of_get_flat_dt_prop(node, "ranges", NULL);
> + if (!prop)
> + return -EINVAL;
> + return 0;
> +}
> +
> +/*
> + * __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_arch(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_info("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 ret;
> + return 0;
> +}
> +
> +/*
> + * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
> + */
> +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;
> }
>
> static int __init __rmem_cmp(const void *a, const void *b)
> @@ -228,13 +305,13 @@ static void __init __rmem_check_for_overlap(void)
> if (reserved_mem_count < 2)
> return;
>
> - sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
> + sort(reserved_mems, reserved_mem_count, sizeof(reserved_mems[0]),
> __rmem_cmp, NULL);
> for (i = 0; i < reserved_mem_count - 1; i++) {
> struct reserved_mem *this, *next;
>
> - this = &reserved_mem[i];
> - next = &reserved_mem[i + 1];
> + this = &reserved_mems[i];
> + next = &reserved_mems[i + 1];
>
> if (this->base + this->size > next->base) {
> phys_addr_t this_end, next_end;
> @@ -248,10 +325,36 @@ static void __init __rmem_check_for_overlap(void)
> }
> }
>
> +/*
> + * __reserved_mem_init_node() - call region specific reserved memory init code
> + */
> +static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
> +{
> + extern const struct of_device_id __reservedmem_of_table[];
> + const struct of_device_id *i;
> + int ret = -ENOENT;
> +
> + for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
> + reservedmem_of_init_fn initfn = i->data;
> + const char *compat = i->compatible;
> +
> + if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
> + continue;
> +
> + ret = initfn(rmem);
> + if (ret == 0) {
> + pr_info("initialized node %s, compatible id %s\n",
> + rmem->name, compat);
> + break;
> + }
> + }
> + return ret;
> +}
> +
> /**
> - * fdt_init_reserved_mem() - allocate and init all saved reserved memory regions
> + * of_reserved_mem_init() - allocate and init all saved reserved memory regions
> */
> -void __init fdt_init_reserved_mem(void)
> +void __init of_reserved_mem_init(void)
> {
> int i;
>
> @@ -259,7 +362,7 @@ void __init fdt_init_reserved_mem(void)
> __rmem_check_for_overlap();
>
> for (i = 0; i < reserved_mem_count; i++) {
> - struct reserved_mem *rmem = &reserved_mem[i];
> + struct reserved_mem *rmem = &reserved_mems[i];
> unsigned long node = rmem->fdt_node;
> int len;
> const __be32 *prop;
> @@ -299,8 +402,8 @@ static inline struct reserved_mem *__find_rmem(struct device_node *node)
> return NULL;
>
> for (i = 0; i < reserved_mem_count; i++)
> - if (reserved_mem[i].phandle == node->phandle)
> - return &reserved_mem[i];
> + if (reserved_mems[i].phandle == node->phandle)
> + return &reserved_mems[i];
> return NULL;
> }
>
> @@ -442,8 +545,8 @@ struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
>
> name = kbasename(np->full_name);
> for (i = 0; i < reserved_mem_count; i++)
> - if (!strcmp(reserved_mem[i].name, name))
> - return &reserved_mem[i];
> + if (!strcmp(reserved_mems[i].name, name))
> + return &reserved_mems[i];
>
> return NULL;
> }
> diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
> index 4de2a24cadc9..34e134bec606 100644
> --- a/include/linux/of_reserved_mem.h
> +++ b/include/linux/of_reserved_mem.h
> @@ -32,6 +32,8 @@ typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
> #define RESERVEDMEM_OF_DECLARE(name, compat, init) \
> _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
>
> +void of_reserved_mem_init(void);
> +
> int of_reserved_mem_device_init_by_idx(struct device *dev,
> struct device_node *np, int idx);
> int of_reserved_mem_device_init_by_name(struct device *dev,
> @@ -45,6 +47,8 @@ struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
> #define RESERVEDMEM_OF_DECLARE(name, compat, init) \
> _OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
>
> +static inline void of_reserved_mem_init(void) { }
> +
> static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
> struct device_node *np, int idx)
> {
> --
> 2.30.2
>
>
next prev parent reply other threads:[~2021-11-30 0:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-19 7:58 [PATCH 0/2] of: remove reserved regions count restriction Calvin Zhang
2021-11-19 7:58 ` [PATCH 1/2] of: Sort reserved_mem related code Calvin Zhang
2021-11-30 0:01 ` Rob Herring [this message]
2021-11-19 7:58 ` [PATCH 2/2] of: reserved_mem: Remove reserved regions count restriction Calvin Zhang
2021-11-19 9:56 ` Andy Shevchenko
2021-11-19 10:30 ` Calvin Zhang
2021-11-21 6:43 ` [PATCH 0/2] of: remove " Mike Rapoport
2021-11-21 9:01 ` Calvin Zhang
2021-11-30 0:08 ` Rob Herring
2021-11-30 21:07 ` Mike Rapoport
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