From: Michael Ellerman <mpe@ellerman.id.au>
Date: Thu, 22 Feb 2018 13:00:11 +0000 (+1100)
Subject: powerpc/powernv: Support firmware disable of RFI flush
X-Git-Tag: v4.16-rc3~7^2
X-Git-Url: https://repo.jachan.dev/linux.git/commitdiff_plain/eb0a2d2620ae431c543963c8c7f08f597366fc60

powerpc/powernv: Support firmware disable of RFI flush

Some versions of firmware will have a setting that can be configured
to disable the RFI flush, add support for it.

Fixes: 6e032b350cd1 ("powerpc/powernv: Check device-tree for RFI flush settings")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 4fb21e17504a..092715b9674b 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -80,6 +80,10 @@ static void pnv_setup_rfi_flush(void)
 		if (np && of_property_read_bool(np, "disabled"))
 			enable--;
 
+		np = of_get_child_by_name(fw_features, "speculation-policy-favor-security");
+		if (np && of_property_read_bool(np, "disabled"))
+			enable = 0;
+
 		of_node_put(np);
 		of_node_put(fw_features);
 	}