This is a note to let you know that I've just added the patch titled
powerpc/pseries: Query hypervisor for RFI flush settings
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-pseries-query-hypervisor-for-rfi-flush-settings.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8989d56878a7735dfdb234707a2fee6faf631085 Mon Sep 17 00:00:00 2001
From: Michael Neuling <mikey@xxxxxxxxxxx>
Date: Wed, 10 Jan 2018 03:07:15 +1100
Subject: powerpc/pseries: Query hypervisor for RFI flush settings
From: Michael Neuling <mikey@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
Patches currently in stable-queue which might be from mikey@xxxxxxxxxxx are
queue-4.9/powerpc-pseries-add-h_get_cpu_characteristics-flags-wrapper.patch
queue-4.9/powerpc-pseries-query-hypervisor-for-rfi-flush-settings.patch