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Subject[PATCH 4.9 08/92] powerpc/pseries: Query hypervisor for RFI flush settings
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Neuling <mikey@neuling.org>

commit 8989d56878a7735dfdb234707a2fee6faf631085 upstream.

A new hypervisor call is available which tells the guest settings
related to the RFI flush. Use it to query the appropriate flush
instruction(s), and whether the flush is required.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/powerpc/platforms/pseries/setup.c | 35 +++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -450,6 +450,39 @@ static void __init find_and_init_phbs(vo
of_pci_check_probe_only();
}

+static void pseries_setup_rfi_flush(void)
+{
+ struct h_cpu_char_result result;
+ enum l1d_flush_type types;
+ bool enable;
+ long rc;
+
+ /* Enable by default */
+ enable = true;
+
+ rc = plpar_get_cpu_characteristics(&result);
+ if (rc == H_SUCCESS) {
+ types = L1D_FLUSH_NONE;
+
+ if (result.character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
+ types |= L1D_FLUSH_MTTRIG;
+ if (result.character & H_CPU_CHAR_L1D_FLUSH_ORI30)
+ types |= L1D_FLUSH_ORI;
+
+ /* Use fallback if nothing set in hcall */
+ if (types == L1D_FLUSH_NONE)
+ types = L1D_FLUSH_FALLBACK;
+
+ if (!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
+ enable = false;
+ } else {
+ /* Default to fallback if case hcall is not available */
+ types = L1D_FLUSH_FALLBACK;
+ }
+
+ setup_rfi_flush(types, enable);
+}
+
static void __init pSeries_setup_arch(void)
{
set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
@@ -467,6 +500,8 @@ static void __init pSeries_setup_arch(vo

fwnmi_init();

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


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