powerpc/64s: Remove POWER9 DD1 support

POWER9 DD1 was never a product. It is no longer supported by upstream
firmware, and it is not effectively supported in Linux due to lack of
testing.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
[mpe: Remove arch_make_huge_pte() entirely]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 1 insertions, 9 deletions

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 9ef4aea9fffe..27f0caee55ea 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1250,17 +1250,9 @@ struct task_struct *__switch_to(struct task_struct *prev,
                  * mappings. If the new process has the foreign real address
                  * mappings, we must issue a cp_abort to clear any state and
                  * prevent snooping, corruption or a covert channel.
-                 *
-                 * DD1 allows paste into normal system memory so we do an
-                 * unpaired copy, rather than cp_abort, to clear the buffer,
-                 * since cp_abort is quite expensive.
                  */
-                if (current_thread_info()->task->thread.used_vas) {
+                if (current_thread_info()->task->thread.used_vas)
                         asm volatile(PPC_CP_ABORT);
-                } else if (cpu_has_feature(CPU_FTR_POWER9_DD1)) {
-                        asm volatile(PPC_COPY(%0, %1)
-                                        : : "r"(dummy_copy_buffer), "r"(0));
-                }
         }
 #endif /* CONFIG_PPC_BOOK3S_64 */