From patchwork Wed Dec 15 15:01:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring (Arm)" X-Patchwork-Id: 12678523 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3894C433F5 for ; Wed, 15 Dec 2021 15:01:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232573AbhLOPBH (ORCPT ); Wed, 15 Dec 2021 10:01:07 -0500 Received: from mail-ot1-f46.google.com ([209.85.210.46]:46845 "EHLO mail-ot1-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229623AbhLOPBG (ORCPT ); Wed, 15 Dec 2021 10:01:06 -0500 Received: by mail-ot1-f46.google.com with SMTP id x3-20020a05683000c300b0057a5318c517so25144727oto.13; Wed, 15 Dec 2021 07:01:06 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Jq0x8iVALaGMJU7xAVYGCo3xMt/B1pDw6eEI2Wc91JY=; b=jUmpvdTkFpdp3iHTVgIXDwfvwb4W8pdNu7Mdces0shez+0MncmrY16u2DESQaXi8yA eHsbMCZ98nULBXxV1ieRe7KH27AB9VnSE9lhDzMwlTtpVp8Ptm8U8B3QcPRVqhhopdPl zgsbWuzBMYmzvykLTeRQrnJYaMzQeHoHStWK9oKFsxYI9GM2mF8HB9zqvMVIX79dk3oL s5VNZwlNhWNPNTp+Pihh6/w58PtaDBoyA7pYkxPnrGMkGdqNrjQDBldSgGGr7ZI0Gn6G DEBEvRgN20rInTIjRKoAdeYw3mozbwBYUDw1ZS8FIZvJFJS0+k7EWrSLXxyMrTSerhaM xjQw== X-Gm-Message-State: AOAM531uHqL3FURdWDgGkZDLUzOw1YHx/xweonPZ1jbgABjFDl20iIjy 2eT8XQt2uX5daghAiN5DNg== X-Google-Smtp-Source: ABdhPJy9pSAKcn/6iGV5Hbw1t6r2jfryKDONyLlWKGyr+6nX1um5VXoLr8WiphSTjUPLS5R9dSYbpw== X-Received: by 2002:a9d:70ce:: with SMTP id w14mr8776986otj.77.1639580464571; Wed, 15 Dec 2021 07:01:04 -0800 (PST) Received: from xps15.herring.priv (66-90-148-213.dyn.grandenetworks.net. [66.90.148.213]) by smtp.googlemail.com with ESMTPSA id r22sm387007oij.36.2021.12.15.07.01.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Dec 2021 07:01:03 -0800 (PST) From: Rob Herring To: John Crispin , Thomas Bogendoerfer , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Frank Rowand Cc: linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Frank Rowand , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v4] of/fdt: Rework early_init_dt_scan_memory() to call directly Date: Wed, 15 Dec 2021 09:01:02 -0600 Message-Id: <20211215150102.1303588-1-robh@kernel.org> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Use of the of_scan_flat_dt() function predates libfdt and is discouraged as libfdt provides a nicer set of APIs. Rework early_init_dt_scan_memory() to be called directly and use libfdt. Cc: John Crispin Cc: Thomas Bogendoerfer Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Frank Rowand Cc: linux-mips@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Rob Herring Reviewed-by: Frank Rowand Link: https://lore.kernel.org/r/20211208155839.4084795-1-robh@kernel.org Signed-off-by: Rob Herring Tested-by: Michael Ellerman --- v4: - Revert the changes to search for memory nodes at any level which were accidentally committed. v3: - Fix powerpc when /ibm,dynamic-reconfiguration-memory is present v2: - ralink: Use 'if' instead of 'else if' - early_init_dt_scan_memory: continue instead of return on no reg - Fix indentation --- arch/mips/ralink/of.c | 19 +++-------- arch/powerpc/kernel/prom.c | 21 ++++++------ drivers/of/fdt.c | 68 ++++++++++++++++++++------------------ include/linux/of_fdt.h | 3 +- 4 files changed, 51 insertions(+), 60 deletions(-) diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c index 0135376c5de5..35a87a2da10b 100644 --- a/arch/mips/ralink/of.c +++ b/arch/mips/ralink/of.c @@ -53,17 +53,6 @@ void __init device_tree_init(void) unflatten_and_copy_device_tree(); } -static int memory_dtb; - -static int __init early_init_dt_find_memory(unsigned long node, - const char *uname, int depth, void *data) -{ - if (depth == 1 && !strcmp(uname, "memory@0")) - memory_dtb = 1; - - return 0; -} - void __init plat_mem_setup(void) { void *dtb; @@ -77,10 +66,10 @@ void __init plat_mem_setup(void) dtb = get_fdt(); __dt_setup_arch(dtb); - of_scan_flat_dt(early_init_dt_find_memory, NULL); - if (memory_dtb) - of_scan_flat_dt(early_init_dt_scan_memory, NULL); - else if (soc_info.mem_detect) + if (!early_init_dt_scan_memory()) + return; + + if (soc_info.mem_detect) soc_info.mem_detect(); else if (soc_info.mem_size) memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M); diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 6e1a106f02eb..ad1230c4f3fe 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -532,19 +532,18 @@ static int __init early_init_drmem_lmb(struct drmem_lmb *lmb, } #endif /* CONFIG_PPC_PSERIES */ -static int __init early_init_dt_scan_memory_ppc(unsigned long node, - const char *uname, - int depth, void *data) +static int __init early_init_dt_scan_memory_ppc(void) { #ifdef CONFIG_PPC_PSERIES - if (depth == 1 && - strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) { + const void *fdt = initial_boot_params; + int node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory"); + + if (node > 0) walk_drmem_lmbs_early(node, NULL, early_init_drmem_lmb); - return 0; - } + #endif - - return early_init_dt_scan_memory(node, uname, depth, data); + + return early_init_dt_scan_memory(); } /* @@ -749,7 +748,7 @@ void __init early_init_devtree(void *params) /* Scan memory nodes and rebuild MEMBLOCKs */ early_init_dt_scan_root(); - of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); + early_init_dt_scan_memory_ppc(); parse_early_param(); @@ -858,7 +857,7 @@ void __init early_get_first_memblock_info(void *params, phys_addr_t *size) */ add_mem_to_memblock = 0; early_init_dt_scan_root(); - of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); + early_init_dt_scan_memory_ppc(); add_mem_to_memblock = 1; if (size) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 5e216555fe4f..a835c458f50a 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -1078,49 +1078,53 @@ u64 __init dt_mem_next_cell(int s, const __be32 **cellp) /* * early_init_dt_scan_memory - Look for and parse memory nodes */ -int __init early_init_dt_scan_memory(unsigned long node, const char *uname, - int depth, void *data) +int __init early_init_dt_scan_memory(void) { - const char *type = of_get_flat_dt_prop(node, "device_type", NULL); - const __be32 *reg, *endp; - int l; - bool hotpluggable; + int node; + const void *fdt = initial_boot_params; - /* We are scanning "memory" nodes only */ - if (type == NULL || strcmp(type, "memory") != 0) - return 0; + fdt_for_each_subnode(node, fdt, 0) { + const char *type = of_get_flat_dt_prop(node, "device_type", NULL); + const __be32 *reg, *endp; + int l; + bool hotpluggable; - reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); - if (reg == NULL) - reg = of_get_flat_dt_prop(node, "reg", &l); - if (reg == NULL) - return 0; + /* We are scanning "memory" nodes only */ + if (type == NULL || strcmp(type, "memory") != 0) + continue; - endp = reg + (l / sizeof(__be32)); - hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); + reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); + if (reg == NULL) + reg = of_get_flat_dt_prop(node, "reg", &l); + if (reg == NULL) + continue; - pr_debug("memory scan node %s, reg size %d,\n", uname, l); + endp = reg + (l / sizeof(__be32)); + hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); - while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { - u64 base, size; + pr_debug("memory scan node %s, reg size %d,\n", + fdt_get_name(fdt, node, NULL), l); - base = dt_mem_next_cell(dt_root_addr_cells, ®); - size = dt_mem_next_cell(dt_root_size_cells, ®); + while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { + u64 base, size; - if (size == 0) - continue; - pr_debug(" - %llx, %llx\n", base, size); + base = dt_mem_next_cell(dt_root_addr_cells, ®); + size = dt_mem_next_cell(dt_root_size_cells, ®); - early_init_dt_add_memory_arch(base, size); + if (size == 0) + continue; + pr_debug(" - %llx, %llx\n", base, size); - if (!hotpluggable) - continue; + early_init_dt_add_memory_arch(base, size); - if (memblock_mark_hotplug(base, size)) - pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", - base, base + size); - } + if (!hotpluggable) + continue; + if (memblock_mark_hotplug(base, size)) + pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", + base, base + size); + } + } return 0; } @@ -1271,7 +1275,7 @@ void __init early_init_dt_scan_nodes(void) pr_warn("No chosen node found, continuing without\n"); /* Setup memory, calling early_init_dt_add_memory_arch */ - of_scan_flat_dt(early_init_dt_scan_memory, NULL); + early_init_dt_scan_memory(); /* Handle linux,usable-memory-range property */ memblock_cap_memory_range(cap_mem_addr, cap_mem_size); diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index df3d31926c3c..914739f3c192 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -59,8 +59,7 @@ extern unsigned long of_get_flat_dt_root(void); extern uint32_t of_get_flat_dt_phandle(unsigned long node); extern int early_init_dt_scan_chosen(char *cmdline); -extern int early_init_dt_scan_memory(unsigned long node, const char *uname, - int depth, void *data); +extern int early_init_dt_scan_memory(void); extern int early_init_dt_scan_chosen_stdout(void); extern void early_init_fdt_scan_reserved_mem(void); extern void early_init_fdt_reserve_self(void);