Commit-ID: f8c0e061cb83bd528ff0843e717bcebc846d4838 Gitweb: https://git.kernel.org/tip/f8c0e061cb83bd528ff0843e717bcebc846d4838 Author: Tony W Wang-oc <tonywwang...@zhaoxin.com> AuthorDate: Tue, 18 Jun 2019 08:37:29 +0000 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Sat, 22 Jun 2019 11:45:58 +0200
x86/acpi/cstate: Add Zhaoxin processors support for cache flush policy in C3 Same as Intel, Zhaoxin MP CPUs support C3 share cache and on all recent Zhaoxin platforms ARB_DISABLE is a nop. So set related flags correctly in the same way as Intel does. Signed-off-by: Tony W Wang-oc <tonywwang...@zhaoxin.com> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: "h...@zytor.com" <h...@zytor.com> Cc: "gre...@linuxfoundation.org" <gre...@linuxfoundation.org> Cc: "r...@rjwysocki.net" <r...@rjwysocki.net> Cc: "l...@kernel.org" <l...@kernel.org> Cc: David Wang <davidw...@zhaoxin.com> Cc: "Cooper Yan(BJ-RD)" <cooper...@zhaoxin.com> Cc: "Qiyuan Wang(BJ-RD)" <qiyuanw...@zhaoxin.com> Cc: "Herry Yang(BJ-RD)" <herryy...@zhaoxin.com> Link: https://lkml.kernel.org/r/a370503660994669991a7f7cda7c5...@zhaoxin.com --- arch/x86/kernel/acpi/cstate.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c index a5e5484988fd..caf2edccbad2 100644 --- a/arch/x86/kernel/acpi/cstate.c +++ b/arch/x86/kernel/acpi/cstate.c @@ -64,6 +64,21 @@ void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags, c->x86_stepping >= 0x0e)) flags->bm_check = 1; } + + if (c->x86_vendor == X86_VENDOR_ZHAOXIN) { + /* + * All Zhaoxin CPUs that support C3 share cache. + * And caches should not be flushed by software while + * entering C3 type state. + */ + flags->bm_check = 1; + /* + * On all recent Zhaoxin platforms, ARB_DISABLE is a nop. + * So, set bm_control to zero to indicate that ARB_DISABLE + * is not required while entering C3 type state. + */ + flags->bm_control = 0; + } } EXPORT_SYMBOL(acpi_processor_power_init_bm_check);
