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Commit 6e032b35 authored by Oliver O'Halloran's avatar Oliver O'Halloran Committed by Michael Ellerman
Browse files

powerpc/powernv: Check device-tree for RFI flush settings 



New device-tree properties are available which tell the hypervisor
settings related to the RFI flush. Use them to determine the
appropriate flush instruction to use, and whether the flush is
required.

Signed-off-by: default avatarOliver O'Halloran <oohall@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 8989d568

arch/powerpc/platforms/powernv/setup.c

+49 −0
Original line number Diff line number Diff line
@@ -37,13 +37,62 @@ 
#include <asm/kexec.h>

#include <asm/smp.h>

#include <asm/tm.h>

#include <asm/setup.h>



#include "powernv.h"



static void pnv_setup_rfi_flush(void)

{

	struct device_node *np, *fw_features;

	enum l1d_flush_type type;

	int enable;



	/* Default to fallback in case fw-features are not available */

	type = L1D_FLUSH_FALLBACK;

	enable = 1;



	np = of_find_node_by_name(NULL, "ibm,opal");

	fw_features = of_get_child_by_name(np, "fw-features");

	of_node_put(np);



	if (fw_features) {

		np = of_get_child_by_name(fw_features, "inst-l1d-flush-trig2");

		if (np && of_property_read_bool(np, "enabled"))

			type = L1D_FLUSH_MTTRIG;



		of_node_put(np);



		np = of_get_child_by_name(fw_features, "inst-l1d-flush-ori30,30,0");

		if (np && of_property_read_bool(np, "enabled"))

			type = L1D_FLUSH_ORI;



		of_node_put(np);



		/* Enable unless firmware says NOT to */

		enable = 2;

		np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-hv-1-to-0");

		if (np && of_property_read_bool(np, "disabled"))

			enable--;



		of_node_put(np);



		np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-pr-0-to-1");

		if (np && of_property_read_bool(np, "disabled"))

			enable--;



		of_node_put(np);

		of_node_put(fw_features);

	}



	setup_rfi_flush(type, enable > 0);

}



static void __init pnv_setup_arch(void)

{

	set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);



	pnv_setup_rfi_flush();



	/* Initialize SMP */

	pnv_smp_init();