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Subject[PATCH RFC rebase 8/9] powerpc/64s: barrier_nospec: Add hcall triggerr
Date
Adapted from the RFI implementation

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/platforms/pseries/mobility.c | 2 +-
arch/powerpc/platforms/pseries/pseries.h | 2 +-
arch/powerpc/platforms/pseries/setup.c | 37 ++++++++++++++++++++++---------
3 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
index 8a8033a249c7..9d506be1580e 100644
--- a/arch/powerpc/platforms/pseries/mobility.c
+++ b/arch/powerpc/platforms/pseries/mobility.c
@@ -349,7 +349,7 @@ void post_mobility_fixup(void)
"failed: %d\n", rc);

/* Possibly switch to a new RFI flush type */
- pseries_setup_rfi_flush();
+ pseries_setup_rfi_nospec();

return;
}
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 27cdcb69fd18..d49670c67686 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -100,6 +100,6 @@ static inline unsigned long cmo_get_page_size(void)

int dlpar_workqueue_init(void);

-void pseries_setup_rfi_flush(void);
+void pseries_setup_rfi_nospec(void);

#endif /* _PSERIES_PSERIES_H */
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 9877c3dfcdc8..4b899a4db6dd 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -459,30 +459,47 @@ static void __init find_and_init_phbs(void)
of_pci_check_probe_only();
}

-void pseries_setup_rfi_flush(void)
+void pseries_setup_rfi_nospec(void)
{
struct h_cpu_char_result result;
- enum l1d_flush_type types;
- bool enable;
+ enum l1d_flush_type flush_types;
+ enum spec_barrier_type barrier_type;
+ bool flush_enable;
+ bool barrier_enable;
long rc;

/* Enable by default */
- enable = true;
- types = L1D_FLUSH_FALLBACK;
+ flush_enable = true;
+ flush_types = L1D_FLUSH_FALLBACK;
+ barrier_enable = true;
+ /* no fallback available if the firmware does not tell us */
+ barrier_type = SPEC_BARRIER_NONE;

rc = plpar_get_cpu_characteristics(&result);
if (rc == H_SUCCESS) {
if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
- types |= L1D_FLUSH_MTTRIG;
+ flush_types |= L1D_FLUSH_MTTRIG;
if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30)
- types |= L1D_FLUSH_ORI;
+ flush_types |= L1D_FLUSH_ORI;
+ if (result.character & H_CPU_CHAR_SPEC_BAR_ORI31)
+ barrier_type |= SPEC_BARRIER_ORI;

if ((!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR)) ||
(!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))
- enable = false;
+ flush_enable = false;
+ /*
+ * Do not check H_CPU_BEHAV_BNDS_CHK_SPEC_BAR - the ORI does
+ * nothing anyway when not supported.
+ */
+ if ((!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))
+ barrier_enable = false;
+ } else {
+ /* Default to fallback if case hcall is not available */
+ flush_types = L1D_FLUSH_FALLBACK;
}

- setup_rfi_flush(types, enable);
+ setup_barrier_nospec(barrier_type, barrier_enable);
+ setup_rfi_flush(flush_types, flush_enable);
}

#ifdef CONFIG_PCI_IOV
@@ -658,7 +675,7 @@ static void __init pSeries_setup_arch(void)

fwnmi_init();

- pseries_setup_rfi_flush();
+ pseries_setup_rfi_nospec();

/* By default, only probe PCI (can be overridden by rtas_pci) */
pci_add_flags(PCI_PROBE_ONLY);
--
2.13.6
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