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Subject[PATCH 2/2] powerpc/powernv: Wire up OPAL address lookups
Date
Use ARCH_HAS_ADDRESS_LOOKUP to look up the opal symbol table. This
allows crashes and xmon debugging to print firmware symbols.

Oops: System Reset, sig: 6 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc2-dirty #903
NIP: 0000000030020434 LR: 000000003000378c CTR: 0000000030020414
REGS: c0000000fffc3d70 TRAP: 0100 Not tainted (5.6.0-rc2-dirty)
MSR: 9000000002101002 <SF,HV,VEC,ME,RI> CR: 28022284 XER: 20040000
CFAR: 0000000030003788 IRQMASK: 3
GPR00: 000000003000378c 0000000031c13c90 0000000030136200 c0000000012cfa10
GPR04: c0000000012cfa10 0000000000000010 0000000000000000 0000000031c10060
GPR08: c0000000012cfaaf 0000000030003640 0000000000000000 0000000000000001
GPR12: 00000000300e0000 c000000001490000 0000000000000000 c00000000139c588
GPR16: 0000000031c10000 c00000000125a900 0000000000000000 c0000000012076a8
GPR20: c0000000012a3950 0000000000000001 0000000031c10060 c0000000012cfaaf
GPR24: 0000000000000019 0000000030003640 0000000000000000 0000000000000000
GPR28: 0000000000000010 c0000000012cfa10 0000000000000000 0000000000000000
NIP [0000000030020434] .dummy_console_write_buffer_space+0x20/0x64 [OPAL]
LR [000000003000378c] opal_entry+0x14c/0x17c [OPAL]

This won't unwind the firmware stack (or its Linux caller) properly if
firmware and kernel endians don't match, but that problem could be solved
in powerpc's unwinder.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/opal-api.h | 6 +++-
arch/powerpc/include/asm/opal.h | 3 ++
arch/powerpc/platforms/powernv/opal-call.c | 2 ++
arch/powerpc/platforms/powernv/opal.c | 40 ++++++++++++++++++++++
5 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 497b7d0b2d7e..4d32b02d35e8 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -115,6 +115,7 @@ config PPC
# Please keep this list sorted alphabetically.
#
select ARCH_32BIT_OFF_T if PPC32
+ select ARCH_HAS_ADDRESS_LOOKUP if PPC_POWERNV
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index c1f25a760eb1..c3a2a797177a 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -214,7 +214,11 @@
#define OPAL_SECVAR_GET 176
#define OPAL_SECVAR_GET_NEXT 177
#define OPAL_SECVAR_ENQUEUE_UPDATE 178
-#define OPAL_LAST 178
+#define OPAL_PHB_SET_OPTION 179
+#define OPAL_PHB_GET_OPTION 180
+#define OPAL_GET_SYMBOL 181
+#define OPAL_LOOKUP_SYMBOL 182
+#define OPAL_LAST 182

#define QUIESCE_HOLD 1 /* Spin all calls at entry */
#define QUIESCE_REJECT 2 /* Fail all calls with OPAL_BUSY */
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 9986ac34b8e2..ef2d9273f06f 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -312,6 +312,9 @@ s64 opal_mpipl_query_tag(enum opal_mpipl_tags tag, u64 *addr);
s64 opal_signal_system_reset(s32 cpu);
s64 opal_quiesce(u64 shutdown_type, s32 cpu);

+int64_t opal_get_symbol(uint64_t addr, __be64 *symaddr, __be64 *symsize, char *namebuf, uint64_t buflen);
+int64_t opal_lookup_symbol(const char *name, __be64 *symaddr, __be64 *symsize);
+
/* Internal functions */
extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
int depth, void *data);
diff --git a/arch/powerpc/platforms/powernv/opal-call.c b/arch/powerpc/platforms/powernv/opal-call.c
index 5cd0f52d258f..ba11112d94df 100644
--- a/arch/powerpc/platforms/powernv/opal-call.c
+++ b/arch/powerpc/platforms/powernv/opal-call.c
@@ -293,3 +293,5 @@ OPAL_CALL(opal_mpipl_query_tag, OPAL_MPIPL_QUERY_TAG);
OPAL_CALL(opal_secvar_get, OPAL_SECVAR_GET);
OPAL_CALL(opal_secvar_get_next, OPAL_SECVAR_GET_NEXT);
OPAL_CALL(opal_secvar_enqueue_update, OPAL_SECVAR_ENQUEUE_UPDATE);
+OPAL_CALL(opal_get_symbol, OPAL_GET_SYMBOL);
+OPAL_CALL(opal_lookup_symbol, OPAL_LOOKUP_SYMBOL);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 2b3dfd0b6cdd..fdf6c4e6f7f9 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -107,6 +107,46 @@ void opal_configure_cores(void)
cur_cpu_spec->cpu_restore();
}

+const char *arch_address_lookup(unsigned long addr,
+ unsigned long *symbolsize,
+ unsigned long *offset,
+ char **modname, char *namebuf)
+{
+ __be64 symaddr;
+ __be64 symsize;
+
+ if (!firmware_has_feature(FW_FEATURE_OPAL))
+ return NULL;
+
+ if (opal_get_symbol(addr, &symaddr, &symsize, namebuf,
+ cpu_to_be64(KSYM_NAME_LEN)) != OPAL_SUCCESS)
+ return NULL;
+
+ *symbolsize = be64_to_cpu(symsize);
+ *offset = addr - be64_to_cpu(symaddr);
+ *modname = "OPAL";
+
+ return namebuf;
+}
+
+unsigned long arch_address_lookup_name(const char *name)
+{
+ __be64 addr;
+ __be64 size;
+
+ if (!firmware_has_feature(FW_FEATURE_OPAL))
+ return 0;
+
+ /* opal: prefix allows lookup of symbols that clash with kernel */
+ if (!strncasecmp(name, "opal:", strlen("opal:")))
+ name += strlen("opal:");
+
+ if (opal_lookup_symbol(name, &addr, &size) != OPAL_SUCCESS)
+ return 0;
+
+ return be64_to_cpu(addr);
+}
+
int __init early_init_dt_scan_opal(unsigned long node,
const char *uname, int depth, void *data)
{
--
2.23.0
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