iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/powernv: Query firmware for count cache flush settings

Browse Source 
commit 99d54754d3d5f896a8f616b0b6520662bc99d66b upstream.

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: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Ellerman 2019-04-22 00:20:28 +10:00 committed by Greg Kroah-Hartman
parent 67fb764be5
commit ee1a6e164c
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/powerpc/platforms/powernv/setup.c
View File

@ -77,6 +77,12 @@ 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.
@ -123,6 +129,7 @@ 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)