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 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: powerpc-pseries-query-hypervisor-for-rfi-flush-settings.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 8989d56878a7735dfdb234707a2fee6faf631085 Mon Sep 17 00:00:00 2001
From: Michael Neuling mikey@neuling.org Date: Wed, 10 Jan 2018 03:07:15 +1100 Subject: powerpc/pseries: Query hypervisor for RFI flush settings
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 | 37 ++++++++++++++++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-)
--- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -499,6 +499,39 @@ 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); @@ -515,7 +548,9 @@ static void __init pSeries_setup_arch(vo
fwnmi_init();
- /* By default, only probe PCI (can be overriden by rtas_pci) */ + pseries_setup_rfi_flush(); + + /* By default, only probe PCI (can be overridden by rtas_pci) */ pci_add_flags(PCI_PROBE_ONLY);
/* Find and initialize PCI host bridges */
Patches currently in stable-queue which might be from mikey@neuling.org are
queue-4.4/powerpc-pseries-add-h_get_cpu_characteristics-flags-wrapper.patch queue-4.4/powerpc-pseries-query-hypervisor-for-rfi-flush-settings.patch