linux-kernel - Re: v4.17 regression: PowerMac G3 won't boot, was Re: [PATCH v5 1/3] of: cache phandle nodes to reduce cost of of_find_node_by

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Date:   Fri, 31 Aug 2018 14:49:51 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Mac User <userm57@...oo.com>, Rob Herring <robh+dt@...nel.org>
Cc:     fthain@...egraphics.com.au, Frank Rowand <frank.rowand@...y.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: v4.17 regression: PowerMac G3 won't boot, was Re: [PATCH v5
 1/3] of: cache phandle nodes to reduce cost of of_find_node_by_phandle()

On Fri, 2018-08-31 at 14:35 +1000, Benjamin Herrenschmidt wrote:
> 
> > If I force output with "-f", the resulting file has no occurrences 
> > of "phandle".
> 
> Are you booting with BootX or Open Firmware ?

Assuming you are using BootX (or miBoot), can you try this patch ?

--- a/arch/powerpc/platforms/powermac/bootx_init.c
+++ b/arch/powerpc/platforms/powermac/bootx_init.c
@@ -37,6 +37,7 @@ static unsigned long __initdata bootx_dt_strend;
 static unsigned long __initdata bootx_node_chosen;
 static boot_infos_t * __initdata bootx_info;
 static char __initdata bootx_disp_path[256];
+static int __initdata bootx_phandle;
 
 /* Is boot-info compatible ? */
 #define BOOT_INFO_IS_COMPATIBLE(bi) \
@@ -258,6 +259,8 @@ static void __init bootx_scan_dt_build_strings(unsigned long base,
                namep = pp->name ? (char *)(base + pp->name) : NULL;
                if (namep == NULL || strcmp(namep, "name") == 0)
                        goto next;
+               if (!strcmp(namep, "phandle") || !strcmp(namep, "linux,phandle"))
+                       bootx_phandle = -1;
                /* get/create string entry */
                soff = bootx_dt_find_string(namep);
                if (soff == 0)
@@ -330,6 +333,12 @@ static void __init bootx_scan_dt_build_struct(unsigned long base,
                ppp = &pp->next;
        }
 
+       /* add a phandle */
+       if (bootx_phandle > 0) {
+               bootx_dt_add_prop("phandle", &bootx_phandle, 4, mem_end);
+               bootx_phandle++;
+       }
+
        if (node == bootx_node_chosen) {
                bootx_add_chosen_props(base, mem_end);
                if (bootx_info->dispDeviceRegEntryOffset == 0)
@@ -385,6 +394,8 @@ static unsigned long __init bootx_flatten_dt(unsigned long start)
        bootx_dt_add_string("linux,bootx-height", &mem_end);
        bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
        bootx_dt_add_string("linux,bootx-addr", &mem_end);
+       if (bootx_phandle > 0)
+               bootx_dt_add_string("phandle", &mem_end);
        /* Wrap up strings */
        hdr->off_dt_strings = bootx_dt_strbase - mem_start;
        hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
@@ -482,6 +493,7 @@ void __init bootx_init(unsigned long r3, unsigned long r4)
        bootx_dt_strbase = bootx_dt_strend = 0;
        bootx_node_chosen = 0;
        bootx_disp_path[0] = 0;
+       bootx_phandle = 1;
 
        if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
                bi->logicalDisplayBase = bi->dispDeviceBase;