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Commit 99d54754 authored by Michael Ellerman's avatar Michael Ellerman
Browse files

powerpc/powernv: Query firmware for count cache flush settings 



Look for fw-features properties to determine the appropriate settings
for the count cache flush, and then call the generic powerpc code to
set it up based on the security feature flags.

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent ba72dc17

arch/powerpc/platforms/powernv/setup.c

+7 −0
Original line number Diff line number Diff line
@@ -78,6 +78,12 @@ static void init_fw_feat_flags(struct device_node *np) 
	if (fw_feature_is("enabled", "fw-count-cache-disabled", np))

		security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);



	if (fw_feature_is("enabled", "fw-count-cache-flush-bcctr2,0,0", np))

		security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);



	if (fw_feature_is("enabled", "needs-count-cache-flush-on-context-switch", np))

		security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);



	/*

	 * The features below are enabled by default, so we instead look to see

	 * if firmware has *disabled* them, and clear them if so.
@@ -124,6 +130,7 @@ static void pnv_setup_rfi_flush(void) 
		  security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));



	setup_rfi_flush(type, enable);

	setup_count_cache_flush();

}



static void __init pnv_setup_arch(void)