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, 2 insertions, 58 deletions

diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 96f68c5aa1f5..bba168d02235 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -226,16 +226,6 @@ void radix__mark_rodata_ro(void)
 {
         unsigned long start, end;
 
-        /*
-         * mark_rodata_ro() will mark itself as !writable at some point.
-         * Due to DD1 workaround in radix__pte_update(), we'll end up with
-         * an invalid pte and the system will crash quite severly.
-         */
-        if (cpu_has_feature(CPU_FTR_POWER9_DD1)) {
-                pr_warn("Warning: Unable to mark rodata read only on P9 DD1\n");
-                return;
-        }
-
         start = (unsigned long)_stext;
         end = (unsigned long)__init_begin;
 
@@ -533,35 +523,6 @@ found:
         return;
 }
 
-static void update_hid_for_radix(void)
-{
-        unsigned long hid0;
-        unsigned long rb = 3UL << PPC_BITLSHIFT(53); /* IS = 3 */
-
-        asm volatile("ptesync": : :"memory");
-        /* prs = 0, ric = 2, rs = 0, r = 1 is = 3 */
-        asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
-                     : : "r"(rb), "i"(1), "i"(0), "i"(2), "r"(0) : "memory");
-        /* prs = 1, ric = 2, rs = 0, r = 1 is = 3 */
-        asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
-                     : : "r"(rb), "i"(1), "i"(1), "i"(2), "r"(0) : "memory");
-        asm volatile("eieio; tlbsync; ptesync; isync; slbia": : :"memory");
-        trace_tlbie(0, 0, rb, 0, 2, 0, 1);
-        trace_tlbie(0, 0, rb, 0, 2, 1, 1);
-
-        /*
-         * now switch the HID
-         */
-        hid0  = mfspr(SPRN_HID0);
-        hid0 |= HID0_POWER9_RADIX;
-        mtspr(SPRN_HID0, hid0);
-        asm volatile("isync": : :"memory");
-
-        /* Wait for it to happen */
-        while (!(mfspr(SPRN_HID0) & HID0_POWER9_RADIX))
-                cpu_relax();
-}
-
 static void radix_init_amor(void)
 {
         /*
@@ -576,22 +537,12 @@ static void radix_init_amor(void)
 
 static void radix_init_iamr(void)
 {
-        unsigned long iamr;
-
-        /*
-         * The IAMR should set to 0 on DD1.
-         */
-        if (cpu_has_feature(CPU_FTR_POWER9_DD1))
-                iamr = 0;
-        else
-                iamr = (1ul << 62);
-
         /*
          * Radix always uses key0 of the IAMR to determine if an access is
          * allowed. We set bit 0 (IBM bit 1) of key0, to prevent instruction
          * fetch.
          */
-        mtspr(SPRN_IAMR, iamr);
+        mtspr(SPRN_IAMR, (1ul << 62));
 }
 
 void __init radix__early_init_mmu(void)
@@ -644,8 +595,6 @@ void __init radix__early_init_mmu(void)
 
         if (!firmware_has_feature(FW_FEATURE_LPAR)) {
                 radix_init_native();
-                if (cpu_has_feature(CPU_FTR_POWER9_DD1))
-                        update_hid_for_radix();
                 lpcr = mfspr(SPRN_LPCR);
                 mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
                 radix_init_partition_table();
@@ -671,10 +620,6 @@ void radix__early_init_mmu_secondary(void)
          * update partition table control register and UPRT
          */
         if (!firmware_has_feature(FW_FEATURE_LPAR)) {
-
-                if (cpu_has_feature(CPU_FTR_POWER9_DD1))
-                        update_hid_for_radix();
-
                 lpcr = mfspr(SPRN_LPCR);
                 mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR);
 
@@ -1095,8 +1040,7 @@ void radix__ptep_set_access_flags(struct vm_area_struct *vma, pte_t *ptep,
          * To avoid NMMU hang while relaxing access, we need mark
          * the pte invalid in between.
          */
-        if (cpu_has_feature(CPU_FTR_POWER9_DD1) ||
-            atomic_read(&mm->context.copros) > 0) {
+        if (atomic_read(&mm->context.copros) > 0) {
                 unsigned long old_pte, new_pte;
 
                 old_pte = __radix_pte_update(ptep, ~0, 0);