The various calls to establish exception endianness and AIL are
now done from a single point using already established CPU and FW
feature bits to decide what to do.
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
v2: Add/fix prototypes of exported function, remove "static"
arch/powerpc/include/asm/hvcall.h | 8 ++--
arch/powerpc/include/asm/opal.h | 1 +
arch/powerpc/kernel/setup_64.c | 68 +++++++++++++++++++++++++++-------
arch/powerpc/platforms/powernv/opal.c | 13 +++----
arch/powerpc/platforms/pseries/setup.c | 31 +---------------
5 files changed, 66 insertions(+), 55 deletions(-)
diff --git a/arch/powerpc/include/asm/hvcall.h
b/arch/powerpc/include/asm/hvcall.h
index 0bc9c28..b88efbb 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -434,13 +434,15 @@ static inline unsigned long cmo_get_page_size(void)
extern long pSeries_enable_reloc_on_exc(void);
extern long pSeries_disable_reloc_on_exc(void);
-
extern long pseries_big_endian_exceptions(void);
+extern long pseries_little_endian_exceptions(void);
#else
-#define pSeries_enable_reloc_on_exc() do {} while (0)
-#define pSeries_disable_reloc_on_exc() do {} while (0)
+#define pSeries_enable_reloc_on_exc() (0)
+#define pSeries_disable_reloc_on_exc() (0)
+#define pseries_big_endian_exceptions() (0)
+#define pseries_little_endian_exceptions() (0)
#endif /* CONFIG_PPC_PSERIES */
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 9d86c66..6135816 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -215,6 +215,7 @@ extern int early_init_dt_scan_opal(unsigned long node,
const char *uname,
int depth, void *data);
extern int early_init_dt_scan_recoverable_ranges(unsigned long node,
const char *uname, int depth, void *data);
+extern void opal_configure_cores(void);
extern int opal_get_chars(uint32_t vtermno, char *buf, int count);
extern int opal_put_chars(uint32_t vtermno, const char *buf, int total_len);
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index a641753..47a2706 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -69,6 +69,7 @@
#include <asm/kvm_ppc.h>
#include <asm/hugetlb.h>
#include <asm/livepatch.h>
+#include <asm/opal.h>
#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
@@ -205,21 +206,60 @@ static void fixup_boot_paca(void)
get_paca()->data_offset = 0;
}
+static void configure_exceptions(void)
+{
+ /* Setup the trampolines from the lowmem exception vectors
+ * to the kdump kernel when not using a relocatable kernel.
+ */
+ setup_kdump_trampoline();
+
+ /* Under a PAPR hypervisor, we need hypercalls */
+ if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
+ long rc;
+
+ /* Enable AIL */
+ rc = pSeries_enable_reloc_on_exc();
+ if (rc == H_P2) {
+ pr_info("Relocation on exceptions not supported\n");
+ } else if (rc != H_SUCCESS) {
+ pr_warn("Unable to enable relocation on exceptions: "
+ "%ld\n", rc);
+ }
+
+ /*
+ * Tell the hypervisor that we want our exceptions to
+ * be taken in little endian mode. If this fails we don't
+ * want to use BUG() because it will trigger an exception.
+ *
+ * We don't call this for big endian as our calling convention
+ * makes us always enter in BE, and the call may fail under
+ * some circumstances with kdump.
+ */
+#ifdef __LITTLE_ENDIAN__
+ rc = pseries_little_endian_exceptions();
+ if (rc) {
+ ppc_md.progress("H_SET_MODE LE exception fail", 0);
+ panic("Could not enable little endian exceptions");
+ }
+#endif
+ } else {
+ /* Set endian mode using OPAL */
+ if (firmware_has_feature(FW_FEATURE_OPAL))
+ opal_configure_cores();
+
+ /* Enable AIL if supported, and we are in hypervisor mode */
+ if (cpu_has_feature(CPU_FTR_HVMODE) &&
+ cpu_has_feature(CPU_FTR_ARCH_207S)) {
+ unsigned long lpcr = mfspr(SPRN_LPCR);
+ mtspr(SPRN_LPCR, lpcr | LPCR_AIL_3);
+ }
+ }
+}
+
static void cpu_ready_for_interrupts(void)
{
/* Set IR and DR in PACA MSR */
get_paca()->kernel_msr = MSR_KERNEL;
-
- /*
- * Enable AIL if supported, and we are in hypervisor mode. If we are
- * not in hypervisor mode, we enable relocation-on interrupts later
- * in pSeries_setup_arch() using the H_SET_MODE hcall.
- */
- if (cpu_has_feature(CPU_FTR_HVMODE) &&
- cpu_has_feature(CPU_FTR_ARCH_207S)) {
- unsigned long lpcr = mfspr(SPRN_LPCR);
- mtspr(SPRN_LPCR, lpcr | LPCR_AIL_3);
- }
}
/*
@@ -276,10 +316,10 @@ void __init early_setup(unsigned long dt_ptr)
/* Probe the machine type */
probe_machine();
- /* Setup the trampolines from the lowmem exception vectors
- * to the kdump kernel when not using a relocatable kernel.
+ /* Configure exception handlers. This include setting up trampolines
+ * if needed, setting exception endian mode, etc...
*/
- setup_kdump_trampoline();
+ configure_exceptions();
/* Initialize the hash table or TLB handling */
early_init_mmu();
diff --git a/arch/powerpc/platforms/powernv/opal.c
b/arch/powerpc/platforms/powernv/opal.c
index 0256d07..802f3b7 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -56,7 +56,7 @@ static DEFINE_SPINLOCK(opal_write_lock);
static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX];
static uint32_t opal_heartbeat;
-static void opal_reinit_cores(void)
+void opal_configure_cores(void)
{
/* Do the actual re-init, This will clobber all FPRs, VRs, etc...
*
@@ -69,6 +69,10 @@ static void opal_reinit_cores(void)
#else
opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
#endif
+
+ /* Restore some bits */
+ if (cur_cpu_spec->cpu_restore)
+ cur_cpu_spec->cpu_restore();
}
int __init early_init_dt_scan_opal(unsigned long node,
@@ -105,13 +109,6 @@ int __init early_init_dt_scan_opal(unsigned long node,
panic("OPAL != V3 detected, no longer supported.\n");
}
- /* Reinit all cores with the right endian */
- opal_reinit_cores();
-
- /* Restore some bits */
- if (cur_cpu_spec->cpu_restore)
- cur_cpu_spec->cpu_restore();
-
return 1;
}
diff --git a/arch/powerpc/platforms/pseries/setup.c
b/arch/powerpc/platforms/pseries/setup.c
index f1fe7aa..ffffd77 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -458,7 +458,7 @@ long pseries_big_endian_exceptions(void)
}
}
-static long pseries_little_endian_exceptions(void)
+long pseries_little_endian_exceptions(void)
{
long rc;
@@ -537,18 +537,6 @@ static void __init pSeries_setup_arch(void)
}
ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
-
- if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
- long rc;
-
- rc = pSeries_enable_reloc_on_exc();
- if (rc == H_P2) {
- pr_info("Relocation on exceptions not supported\n");
- } else if (rc != H_SUCCESS) {
- pr_warn("Unable to enable relocation on exceptions: "
- "%ld\n", rc);
- }
- }
}
static int __init pSeries_init_panel(void)
@@ -751,23 +739,6 @@ static int __init pSeries_probe(void)
pr_debug("pSeries detected, looking for LPAR capability...\n");
-
-#ifdef __LITTLE_ENDIAN__
- if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
- long rc;
- /*
- * Tell the hypervisor that we want our exceptions to
- * be taken in little endian mode. If this fails we don't
- * want to use BUG() because it will trigger an exception.
- */
- rc = pseries_little_endian_exceptions();
- if (rc) {
- ppc_md.progress("H_SET_MODE LE exception fail", 0);
- panic("Could not enable little endian exceptions");
- }
- }
-#endif
-
if (firmware_has_feature(FW_FEATURE_LPAR))
hpte_init_lpar();
else
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