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powerpc/64s: Remove POWER9 DD1 support

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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>
This commit is contained in:
Nicholas Piggin 2018-07-05 18:47:00 +10:00 • committed by Michael Ellerman
parent ce397d215c
commit 2bf1071a8d
32 changed files with 65 additions and 532 deletions
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10
arch/powerpc/kernel/process.c
View file

@ -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 */