linux-kernel - [PATCH RFC 7/8] powerpc/64s: barrier

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Date:   Tue, 13 Mar 2018 19:33:05 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Suchanek <msuchanek@...e.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Nicholas Piggin <npiggin@...il.com>,
        "Tobin C. Harding" <me@...in.cc>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        David Gibson <david@...son.dropbear.id.au>,
        Al Viro <viro@...iv.linux.org.uk>,
        Michael Neuling <mikey@...ling.org>,
        "Oliver O'Halloran" <oohall@...il.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Balbir Singh <bsingharora@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Russell Currey <ruscur@...sell.cc>,
        Joe Perches <joe@...ches.com>,
        "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH RFC 7/8] powerpc/64s: barrier_nospec: Add hcall triggerr

Copypasta from rfi implementation

Signed-off-by: Michal Suchanek <msuchanek@...e.de>
---
 arch/powerpc/platforms/pseries/setup.c | 38 ++++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 1a527625acf7..b779ddb8e250 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -459,38 +459,50 @@ static void __init find_and_init_phbs(void)
 	of_pci_check_probe_only();
 }
 
-static void pseries_setup_rfi_flush(void)
+static 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;
+	flush_enable = true;
+	barrier_enable = true;
+	/* no fallback if the firmware does not tell us */
+	barrier_type = SPEC_BARRIER_NONE;
 
 	rc = plpar_get_cpu_characteristics(&result);
 	if (rc == H_SUCCESS) {
-		types = L1D_FLUSH_NONE;
+		flush_types = L1D_FLUSH_NONE;
 
 		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;
 
 		/* Use fallback if nothing set in hcall */
-		if (types == L1D_FLUSH_NONE)
-			types = L1D_FLUSH_FALLBACK;
+		if (flush_types == L1D_FLUSH_NONE)
+			flush_types = L1D_FLUSH_FALLBACK;
 
 		if ((!(result.behaviour & H_CPU_BEHAV_L1D_FLUSH_PR)) ||
 		    (!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))
-			enable = false;
+			flush_enable = false;
+
+		if ((!(result.behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR)) ||
+		    (!(result.behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)))
+			barrier_enable = false;
 	} else {
 		/* Default to fallback if case hcall is not available */
-		types = L1D_FLUSH_FALLBACK;
+		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
@@ -666,7 +678,7 @@ 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