[PATCH 01/12] powerpc/prom_init: Make of_workarounds static

[PATCH 01/12] powerpc/prom_init: Make of_workarounds static

[Benjamin Herrenschmidt]

It's not used anywhere else

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 9b38a2e5dd35..a1ba56e8c917 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -87,7 +87,7 @@
 #define OF_WORKAROUNDS	0
 #else
 #define OF_WORKAROUNDS	of_workarounds
-int of_workarounds;
+static int of_workarounds __promdata;
 #endif
 
 #define OF_WA_CLAIM	1	/* do phys/virt claim separately, then map */
-- 
2.17.1

[PATCH 02/12] powerpc/prom_init: Make "fake_elf" const

[Benjamin Herrenschmidt]

It is never modified

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index a1ba56e8c917..e44f55be64ba 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -922,7 +922,7 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
 
 /* Old method - ELF header with PT_NOTE sections only works on BE */
 #ifdef __BIG_ENDIAN__
-static struct fake_elf {
+static const struct fake_elf {
 	Elf32_Ehdr	elfhdr;
 	Elf32_Phdr	phdr[2];
 	struct chrpnote {
-- 
2.17.1

[PATCH 03/12] powerpc/prom_init: Make "default_colors" const

[Benjamin Herrenschmidt]

It's never modified either

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index e44f55be64ba..2e1ebf26e8e4 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2202,7 +2202,7 @@ static void __init prom_check_displays(void)
 	ihandle ih;
 	int i;
 
-	static unsigned char default_colors[] = {
+	static const unsigned char default_colors[] = {
 		0x00, 0x00, 0x00,
 		0x00, 0x00, 0xaa,
 		0x00, 0xaa, 0x00,
-- 
2.17.1

[PATCH 04/12] powerpc/prom_init: Replace __initdata with __prombss when applicable

[Benjamin Herrenschmidt]

This replaces all occurrences of __initdata for uninitialized
data with a new __prombss

Currently __promdata is defined to be __initdata but we'll
eventually change that.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 55 +++++++++++++++++----------------
 1 file changed, 29 insertions(+), 26 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 2e1ebf26e8e4..9942bfca12e4 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -48,6 +48,9 @@
 
 #include <linux/linux_logo.h>
 
+/* All of prom_init bss lives here */
+#define __prombss __initdata
+
 /*
  * Eventually bump that one up
  */
@@ -87,7 +90,7 @@
 #define OF_WORKAROUNDS	0
 #else
 #define OF_WORKAROUNDS	of_workarounds
-static int of_workarounds __promdata;
+static int of_workarounds __prombss;
 #endif
 
 #define OF_WA_CLAIM	1	/* do phys/virt claim separately, then map */
@@ -148,26 +151,26 @@ extern void copy_and_flush(unsigned long dest, unsigned long src,
 			   unsigned long size, unsigned long offset);
 
 /* prom structure */
-static struct prom_t __initdata prom;
+static struct prom_t __prombss prom;
 
-static unsigned long prom_entry __initdata;
+static unsigned long __prombss prom_entry;
 
 #define PROM_SCRATCH_SIZE 256
 
-static char __initdata of_stdout_device[256];
-static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
+static char __prombss of_stdout_device[256];
+static char __prombss prom_scratch[PROM_SCRATCH_SIZE];
 
-static unsigned long __initdata dt_header_start;
-static unsigned long __initdata dt_struct_start, dt_struct_end;
-static unsigned long __initdata dt_string_start, dt_string_end;
+static unsigned long __prombss dt_header_start;
+static unsigned long __prombss dt_struct_start, dt_struct_end;
+static unsigned long __prombss dt_string_start, dt_string_end;
 
-static unsigned long __initdata prom_initrd_start, prom_initrd_end;
+static unsigned long __prombss prom_initrd_start, prom_initrd_end;
 
 #ifdef CONFIG_PPC64
-static int __initdata prom_iommu_force_on;
-static int __initdata prom_iommu_off;
-static unsigned long __initdata prom_tce_alloc_start;
-static unsigned long __initdata prom_tce_alloc_end;
+static int __prombss prom_iommu_force_on;
+static int __prombss prom_iommu_off;
+static unsigned long __prombss prom_tce_alloc_start;
+static unsigned long __prombss prom_tce_alloc_end;
 #endif
 
 static bool prom_radix_disable __initdata = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
@@ -190,22 +193,22 @@ struct platform_support {
 #define PLATFORM_GENERIC	0x0500
 #define PLATFORM_OPAL		0x0600
 
-static int __initdata of_platform;
+static int __prombss of_platform;
 
-static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
+static char __prombss prom_cmd_line[COMMAND_LINE_SIZE];
 
-static unsigned long __initdata prom_memory_limit;
+static unsigned long __prombss prom_memory_limit;
 
-static unsigned long __initdata alloc_top;
-static unsigned long __initdata alloc_top_high;
-static unsigned long __initdata alloc_bottom;
-static unsigned long __initdata rmo_top;
-static unsigned long __initdata ram_top;
+static unsigned long __prombss alloc_top;
+static unsigned long __prombss alloc_top_high;
+static unsigned long __prombss alloc_bottom;
+static unsigned long __prombss rmo_top;
+static unsigned long __prombss ram_top;
 
-static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
-static int __initdata mem_reserve_cnt;
+static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE];
+static int __prombss mem_reserve_cnt;
 
-static cell_t __initdata regbuf[1024];
+static cell_t __prombss regbuf[1024];
 
 static bool rtas_has_query_cpu_stopped;
 
@@ -1565,8 +1568,8 @@ static void __init prom_close_stdin(void)
 #ifdef CONFIG_PPC_POWERNV
 
 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
-static u64 __initdata prom_opal_base;
-static u64 __initdata prom_opal_entry;
+static u64 __prombss prom_opal_base;
+static u64 __prombss prom_opal_entry;
 #endif
 
 /*
-- 
2.17.1

[PATCH 05/12] powerpc/prom_init: Remove support for OPAL v2

[Benjamin Herrenschmidt]

We removed support for running under any OPAL version
earlier than v3 in 2015 (they never saw the light of day
anyway), but we kept some leftovers of this support in
prom_init.c, so let's take it out.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 125 +++-----------------------------
 1 file changed, 10 insertions(+), 115 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 9942bfca12e4..9852cdb8bb9e 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -43,7 +43,6 @@
 #include <asm/btext.h>
 #include <asm/sections.h>
 #include <asm/machdep.h>
-#include <asm/opal.h>
 #include <asm/asm-prototypes.h>
 
 #include <linux/linux_logo.h>
@@ -191,7 +190,6 @@ struct platform_support {
 #define PLATFORM_LPAR		0x0001
 #define PLATFORM_POWERMAC	0x0400
 #define PLATFORM_GENERIC	0x0500
-#define PLATFORM_OPAL		0x0600
 
 static int __prombss of_platform;
 
@@ -684,7 +682,7 @@ static void __init early_cmdline_parse(void)
 		prom_debug("Radix disabled from cmdline\n");
 }
 
-#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
+#ifdef CONFIG_PPC_PSERIES
 /*
  * The architecture vector has an array of PVR mask/value pairs,
  * followed by # option vectors - 1, followed by the option vectors.
@@ -1228,7 +1226,7 @@ static void __init prom_send_capabilities(void)
 	}
 #endif /* __BIG_ENDIAN__ */
 }
-#endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
+#endif /* CONFIG_PPC_PSERIES */
 
 /*
  * Memory allocation strategy... our layout is normally:
@@ -1565,88 +1563,6 @@ static void __init prom_close_stdin(void)
 	}
 }
 
-#ifdef CONFIG_PPC_POWERNV
-
-#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
-static u64 __prombss prom_opal_base;
-static u64 __prombss prom_opal_entry;
-#endif
-
-/*
- * Allocate room for and instantiate OPAL
- */
-static void __init prom_instantiate_opal(void)
-{
-	phandle opal_node;
-	ihandle opal_inst;
-	u64 base, entry;
-	u64 size = 0, align = 0x10000;
-	__be64 val64;
-	u32 rets[2];
-
-	prom_debug("prom_instantiate_opal: start...\n");
-
-	opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
-	prom_debug("opal_node: %x\n", opal_node);
-	if (!PHANDLE_VALID(opal_node))
-		return;
-
-	val64 = 0;
-	prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
-	size = be64_to_cpu(val64);
-	if (size == 0)
-		return;
-	val64 = 0;
-	prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
-	align = be64_to_cpu(val64);
-
-	base = alloc_down(size, align, 0);
-	if (base == 0) {
-		prom_printf("OPAL allocation failed !\n");
-		return;
-	}
-
-	opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
-	if (!IHANDLE_VALID(opal_inst)) {
-		prom_printf("opening opal package failed (%x)\n", opal_inst);
-		return;
-	}
-
-	prom_printf("instantiating opal at 0x%llx...", base);
-
-	if (call_prom_ret("call-method", 4, 3, rets,
-			  ADDR("load-opal-runtime"),
-			  opal_inst,
-			  base >> 32, base & 0xffffffff) != 0
-	    || (rets[0] == 0 && rets[1] == 0)) {
-		prom_printf(" failed\n");
-		return;
-	}
-	entry = (((u64)rets[0]) << 32) | rets[1];
-
-	prom_printf(" done\n");
-
-	reserve_mem(base, size);
-
-	prom_debug("opal base     = 0x%llx\n", base);
-	prom_debug("opal align    = 0x%llx\n", align);
-	prom_debug("opal entry    = 0x%llx\n", entry);
-	prom_debug("opal size     = 0x%llx\n", size);
-
-	prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
-		     &base, sizeof(base));
-	prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
-		     &entry, sizeof(entry));
-
-#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
-	prom_opal_base = base;
-	prom_opal_entry = entry;
-#endif
-	prom_debug("prom_instantiate_opal: end...\n");
-}
-
-#endif /* CONFIG_PPC_POWERNV */
-
 /*
  * Allocate room for and instantiate RTAS
  */
@@ -2153,10 +2069,6 @@ static int __init prom_find_machine_type(void)
 		}
 	}
 #ifdef CONFIG_PPC64
-	/* Try to detect OPAL */
-	if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
-		return PLATFORM_OPAL;
-
 	/* Try to figure out if it's an IBM pSeries or any other
 	 * PAPR compliant platform. We assume it is if :
 	 *  - /device_type is "chrp" (please, do NOT use that for future
@@ -2485,7 +2397,7 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
 	}
 
 	/* Add a "linux,phandle" property if no "phandle" property already
-	 * existed (can happen with OPAL)
+	 * existed.
 	 */
 	if (!has_phandle) {
 		soff = dt_find_string("linux,phandle");
@@ -3175,7 +3087,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
 	 */
 	early_cmdline_parse();
 
-#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
+#ifdef CONFIG_PPC_PSERIES
 	/*
 	 * On pSeries, inform the firmware about our capabilities
 	 */
@@ -3219,15 +3131,9 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
 	 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
 	 * have a usable RTAS implementation.
 	 */
-	if (of_platform != PLATFORM_POWERMAC &&
-	    of_platform != PLATFORM_OPAL)
+	if (of_platform != PLATFORM_POWERMAC)
 		prom_instantiate_rtas();
 
-#ifdef CONFIG_PPC_POWERNV
-	if (of_platform == PLATFORM_OPAL)
-		prom_instantiate_opal();
-#endif /* CONFIG_PPC_POWERNV */
-
 #ifdef CONFIG_PPC64
 	/* instantiate sml */
 	prom_instantiate_sml();
@@ -3240,8 +3146,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
 	 *
 	 * (This must be done after instanciating RTAS)
 	 */
-	if (of_platform != PLATFORM_POWERMAC &&
-	    of_platform != PLATFORM_OPAL)
+	if (of_platform != PLATFORM_POWERMAC)
 		prom_hold_cpus();
 
 	/*
@@ -3285,11 +3190,9 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
 	/*
 	 * in case stdin is USB and still active on IBM machines...
 	 * Unfortunately quiesce crashes on some powermacs if we have
-	 * closed stdin already (in particular the powerbook 101). It
-	 * appears that the OPAL version of OFW doesn't like it either.
+	 * closed stdin already (in particular the powerbook 101).
 	 */
-	if (of_platform != PLATFORM_POWERMAC &&
-	    of_platform != PLATFORM_OPAL)
+	if (of_platform != PLATFORM_POWERMAC)
 		prom_close_stdin();
 
 	/*
@@ -3307,10 +3210,8 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
 	hdr = dt_header_start;
 
 	/* Don't print anything after quiesce under OPAL, it crashes OFW */
-	if (of_platform != PLATFORM_OPAL) {
-		prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
-		prom_debug("->dt_header_start=0x%lx\n", hdr);
-	}
+	prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
+	prom_debug("->dt_header_start=0x%lx\n", hdr);
 
 #ifdef CONFIG_PPC32
 	reloc_got2(-offset);
@@ -3318,13 +3219,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
 	unreloc_toc();
 #endif
 
-#ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
-	/* OPAL early debug gets the OPAL base & entry in r8 and r9 */
-	__start(hdr, kbase, 0, 0, 0,
-		prom_opal_base, prom_opal_entry);
-#else
 	__start(hdr, kbase, 0, 0, 0, 0, 0);
-#endif
 
 	return 0;
 }
-- 
2.17.1

[PATCH 06/12] powerpc/prom_init: Move prom_radix_disable to __prombss

[Benjamin Herrenschmidt]

Initialize it dynamically instead of statically

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 9852cdb8bb9e..70f2bde06ab3 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -172,7 +172,9 @@ static unsigned long __prombss prom_tce_alloc_start;
 static unsigned long __prombss prom_tce_alloc_end;
 #endif
 
-static bool prom_radix_disable __initdata = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
+#ifdef CONFIG_PPC_PSERIES
+static bool prom_radix_disable __prombss;
+#endif
 
 struct platform_support {
 	bool hash_mmu;
@@ -665,6 +667,8 @@ static void __init early_cmdline_parse(void)
 #endif
 	}
 
+#ifdef CONFIG_PPC_PSERIES
+	prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
 	opt = strstr(prom_cmd_line, "disable_radix");
 	if (opt) {
 		opt += 13;
@@ -680,6 +684,7 @@ static void __init early_cmdline_parse(void)
 	}
 	if (prom_radix_disable)
 		prom_debug("Radix disabled from cmdline\n");
+#endif /* CONFIG_PPC_PSERIES */
 }
 
 #ifdef CONFIG_PPC_PSERIES
-- 
2.17.1

[PATCH 07/12] powerpc/prom_init: Move ibm_arch_vec to __prombss

[Benjamin Herrenschmidt]

Make the existing initialized definition constant and copy
it to a __prombss copy

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 70f2bde06ab3..03b171bb1c29 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -788,7 +788,7 @@ struct ibm_arch_vec {
 	struct option_vector6 vec6;
 } __packed;
 
-struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
+static const struct ibm_arch_vec ibm_architecture_vec_template = {
 	.pvrs = {
 		{
 			.mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
@@ -926,6 +926,8 @@ struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
 	},
 };
 
+static struct ibm_arch_vec __prombss ibm_architecture_vec  ____cacheline_aligned;
+
 /* Old method - ELF header with PT_NOTE sections only works on BE */
 #ifdef __BIG_ENDIAN__
 static const struct fake_elf {
@@ -1135,6 +1137,10 @@ static void __init prom_check_platform_support(void)
 	};
 	int prop_len = prom_getproplen(prom.chosen,
 				       "ibm,arch-vec-5-platform-support");
+
+	/* First copy the architecture vec template */
+	ibm_architecture_vec = ibm_architecture_vec_template;
+
 	if (prop_len > 1) {
 		int i;
 		u8 vec[prop_len];
-- 
2.17.1

[PATCH 08/12] powerpc/prom_init: Move const structures to __initconst

[Benjamin Herrenschmidt]

As they are no longer used past the end of prom_init

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 03b171bb1c29..cbd54fe30367 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -788,7 +788,7 @@ struct ibm_arch_vec {
 	struct option_vector6 vec6;
 } __packed;
 
-static const struct ibm_arch_vec ibm_architecture_vec_template = {
+static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
 	.pvrs = {
 		{
 			.mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
@@ -963,7 +963,7 @@ static const struct fake_elf {
 			u32	ignore_me;
 		} rpadesc;
 	} rpanote;
-} fake_elf = {
+} fake_elf __initconst = {
 	.elfhdr = {
 		.e_ident = { 0x7f, 'E', 'L', 'F',
 			     ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
@@ -2128,7 +2128,7 @@ static void __init prom_check_displays(void)
 	ihandle ih;
 	int i;
 
-	static const unsigned char default_colors[] = {
+	static const unsigned char default_colors[] __initconst = {
 		0x00, 0x00, 0x00,
 		0x00, 0x00, 0xaa,
 		0x00, 0xaa, 0x00,
-- 
2.17.1

[PATCH 09/12] powerpc/prom_init: Move a few remaining statics to appropriate sections

[Benjamin Herrenschmidt]

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index cbd54fe30367..306562d4d818 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -173,7 +173,7 @@ static unsigned long __prombss prom_tce_alloc_end;
 #endif
 
 #ifdef CONFIG_PPC_PSERIES
-static bool prom_radix_disable __prombss;
+static bool __prombss prom_radix_disable;
 #endif
 
 struct platform_support {
@@ -210,7 +210,7 @@ static int __prombss mem_reserve_cnt;
 
 static cell_t __prombss regbuf[1024];
 
-static bool rtas_has_query_cpu_stopped;
+static bool  __prombss rtas_has_query_cpu_stopped;
 
 
 /*
@@ -525,8 +525,8 @@ static void add_string(char **str, const char *q)
 
 static char *tohex(unsigned int x)
 {
-	static char digits[] = "0123456789abcdef";
-	static char result[9];
+	static const char digits[] __initconst = "0123456789abcdef";
+	static char result[9] __prombss;
 	int i;
 
 	result[8] = 0;
@@ -2324,7 +2324,7 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
 	char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
 	unsigned long soff;
 	unsigned char *valp;
-	static char pname[MAX_PROPERTY_NAME];
+	static char pname[MAX_PROPERTY_NAME] __prombss;
 	int l, room, has_phandle = 0;
 
 	dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
-- 
2.17.1

[PATCH 10/12] powerpc/prom_init: Move __prombss to it's own section and store it in .bss

[Benjamin Herrenschmidt]

This makes __prombss its own section, and for now store
it in .bss.

This will give us the ability later to store it elsewhere
and/or free it after boot (it's about 8KB).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c   | 2 +-
 arch/powerpc/kernel/vmlinux.lds.S | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 306562d4d818..57762f19f136 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -48,7 +48,7 @@
 #include <linux/linux_logo.h>
 
 /* All of prom_init bss lives here */
-#define __prombss __initdata
+#define __prombss __section(.bss.prominit)
 
 /*
  * Eventually bump that one up
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index 07ae018e550e..ac0ceb31b336 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -4,6 +4,9 @@
 #else
 #define PROVIDE32(x)	PROVIDE(x)
 #endif
+
+#define BSS_FIRST_SECTIONS *(.bss.prominit)
+
 #include <asm/page.h>
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/cache.h>
-- 
2.17.1

[PATCH 11/12] powerpc: Check prom_init for disallowed sections

[Benjamin Herrenschmidt]

prom_init.c must not modify the kernel image outside
of the .bss.prominit section. Thus make sure that
prom_init.o doesn't have anything in any of these:

	.data
	.bss
	.init.data

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init_check.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index acb6b9226352..667df97d2595 100644
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -28,6 +28,18 @@ OBJ="$2"
 
 ERROR=0
 
+function check_section()
+{
+    file=$1
+    section=$2
+    size=$(objdump -h -j $section $file 2>/dev/null | awk "\$2 == \"$section\" {print \$3}")
+    size=${size:-0}
+    if [ $size -ne 0 ]; then
+	ERROR=1
+	echo "Error: Section $section not empty in prom_init.c" >&2
+    fi
+}
+
 for UNDEF in $($NM -u $OBJ | awk '{print $2}')
 do
 	# On 64-bit nm gives us the function descriptors, which have
@@ -66,4 +78,8 @@ do
 	fi
 done
 
+check_section $OBJ .data
+check_section $OBJ .bss
+check_section $OBJ .init.data
+
 exit $ERROR
-- 
2.17.1

[PATCH 12/12] powerpc/prom_init: Generate "phandle" instead of "linux, phandle"

[Benjamin Herrenschmidt]

When creating the boot-time FDT from an actual Open Firmware live
tree, let's generate "phandle" properties for the phandles instead
of the old deprecated "linux,phandle".

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/prom_init.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 57762f19f136..64409d2ecaee 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2407,14 +2407,12 @@ static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
 			has_phandle = 1;
 	}
 
-	/* Add a "linux,phandle" property if no "phandle" property already
-	 * existed.
-	 */
+	/* Add a "phandle" property if none already exist */
 	if (!has_phandle) {
-		soff = dt_find_string("linux,phandle");
+		soff = dt_find_string("phandle");
 		if (soff == 0)
 			prom_printf("WARNING: Can't find string index for"
-				    " <linux-phandle> node %s\n", path);
+				    " <phandle> node %s\n", path);
 		else {
 			dt_push_token(OF_DT_PROP, mem_start, mem_end);
 			dt_push_token(4, mem_start, mem_end);
@@ -2474,9 +2472,9 @@ static void __init flatten_device_tree(void)
 	dt_string_start = mem_start;
 	mem_start += 4; /* hole */
 
-	/* Add "linux,phandle" in there, we'll need it */
+	/* Add "phandle" in there, we'll need it */
 	namep = make_room(&mem_start, &mem_end, 16, 1);
-	strcpy(namep, "linux,phandle");
+	strcpy(namep, "phandle");
 	mem_start = (unsigned long)namep + strlen(namep) + 1;
 
 	/* Build string array */
-- 
2.17.1

Re: [04/12] powerpc/prom_init: Replace __initdata with __prombss when applicable

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:52 UTC, Benjamin Herrenschmidt wrote:
> This replaces all occurrences of __initdata for uninitialized
> data with a new __prombss
> 
> Currently __promdata is defined to be __initdata but we'll
> eventually change that.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e63334e556d9286fc30bec10503608

cheers

Re: [05/12] powerpc/prom_init: Remove support for OPAL v2

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:53 UTC, Benjamin Herrenschmidt wrote:
> We removed support for running under any OPAL version
> earlier than v3 in 2015 (they never saw the light of day
> anyway), but we kept some leftovers of this support in
> prom_init.c, so let's take it out.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/11fdb309341ca1ba2e3d03fd1c9c0c

cheers

Re: [06/12] powerpc/prom_init: Move prom_radix_disable to __prombss

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:54 UTC, Benjamin Herrenschmidt wrote:
> Initialize it dynamically instead of statically
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c886087caee759790db47f345f8382

cheers

Re: [07/12] powerpc/prom_init: Move ibm_arch_vec to __prombss

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:55 UTC, Benjamin Herrenschmidt wrote:
> Make the existing initialized definition constant and copy
> it to a __prombss copy
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/a614f52e75bd69b513707b4adc6721

cheers

Re: [08/12] powerpc/prom_init: Move const structures to __initconst

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:56 UTC, Benjamin Herrenschmidt wrote:
> As they are no longer used past the end of prom_init
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/d00e34b92cd7d8f1c10c2f0a8c1036

cheers

Re: [09/12] powerpc/prom_init: Move a few remaining statics to appropriate sections

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:57 UTC, Benjamin Herrenschmidt wrote:
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/8ca2d5151e7f5cbef42eda780eac56

cheers

Re: [10/12] powerpc/prom_init: Move __prombss to it's own section and store it in .bss

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:58 UTC, Benjamin Herrenschmidt wrote:
> This makes __prombss its own section, and for now store
> it in .bss.
> 
> This will give us the ability later to store it elsewhere
> and/or free it after boot (it's about 8KB).
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/5f69e38885c3483a1838dd946aaf01

cheers

Re: [11/12] powerpc: Check prom_init for disallowed sections

[Michael Ellerman]

On Mon, 2018-10-15 at 02:49:59 UTC, Benjamin Herrenschmidt wrote:
> prom_init.c must not modify the kernel image outside
> of the .bss.prominit section. Thus make sure that
> prom_init.o doesn't have anything in any of these:
> 
> 	.data
> 	.bss
> 	.init.data
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/2c51d97ee88da897db8405f659d173

cheers

Re: [12/12] powerpc/prom_init: Generate "phandle" instead of "linux, phandle"

[Michael Ellerman]

On Mon, 2018-10-15 at 02:50:00 UTC, Benjamin Herrenschmidt wrote:
> When creating the boot-time FDT from an actual Open Firmware live
> tree, let's generate "phandle" properties for the phandles instead
> of the old deprecated "linux,phandle".
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/f1f208e54d08ccf00121c700a9bb1f

cheers