[POWERPC] spufs: wrap mfc sdr access

SPRN_SDR1 and the SPE's MFC SDR are hypervisor resources and
are not accessible from a logical partition.  This change adds an
access wrapper.

When running on bare H/W, the spufs needs to only set the SPE's MFC SDR
to the value of the PPE's SPRN_SDR1 once at SPE initialization, so this
change renames mfc_sdr_set() to mfc_sdr_setup() and moves the
access of SPRN_SDR1 into the mmio wrapper.  It also removes the now
unneeded member mfc_sdr_RW from struct spu_priv1_collapsed.

Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

--
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/cell/spu_base.c

@@ -805,7 +805,7 @@ static int __init create_spu(struct device_node *spe)
 	if (ret)
 		goto out_unmap;
 	spin_lock_init(&spu->register_lock);
-	spu_mfc_sdr_set(spu, mfspr(SPRN_SDR1));
+	spu_mfc_sdr_setup(spu);
 	spu_mfc_sr1_set(spu, 0x33);
 	mutex_lock(&spu_mutex);
 

arch/powerpc/platforms/cell/spu_priv1_mmio.c

@@ -84,9 +84,9 @@ static void mfc_dsisr_set(struct spu *spu, u64 dsisr)
 	out_be64(&spu->priv1->mfc_dsisr_RW, dsisr);
 }
 
-static void mfc_sdr_set(struct spu *spu, u64 sdr)
+static void mfc_sdr_setup(struct spu *spu)
 {
-	out_be64(&spu->priv1->mfc_sdr_RW, sdr);
+	out_be64(&spu->priv1->mfc_sdr_RW, mfspr(SPRN_SDR1));
 }
 
 static void mfc_sr1_set(struct spu *spu, u64 sr1)
@@ -146,7 +146,7 @@ const struct spu_priv1_ops spu_priv1_mmio_ops =
 	.mfc_dar_get = mfc_dar_get,
 	.mfc_dsisr_get = mfc_dsisr_get,
 	.mfc_dsisr_set = mfc_dsisr_set,
-	.mfc_sdr_set = mfc_sdr_set,
+	.mfc_sdr_setup = mfc_sdr_setup,
 	.mfc_sr1_set = mfc_sr1_set,
 	.mfc_sr1_get = mfc_sr1_get,
 	.mfc_tclass_id_set = mfc_tclass_id_set,

arch/powerpc/platforms/cell/spufs/switch.c

@@ -2165,9 +2165,6 @@ static void init_priv1(struct spu_state *csa)
 	    MFC_STATE1_PROBLEM_STATE_MASK |
 	    MFC_STATE1_RELOCATE_MASK | MFC_STATE1_BUS_TLBIE_MASK;
 
-	/* Set storage description.  */
-	csa->priv1.mfc_sdr_RW = mfspr(SPRN_SDR1);
-
 	/* Enable OS-specific set of interrupts. */
 	csa->priv1.int_mask_class0_RW = CLASS0_ENABLE_DMA_ALIGNMENT_INTR |
 	    CLASS0_ENABLE_INVALID_DMA_COMMAND_INTR |

include/asm-powerpc/spu_csa.h

@@ -151,7 +151,6 @@ struct spu_priv1_collapsed {
 	u64 mfc_fir_chkstp_enable_RW;
 	u64 smf_sbi_signal_sel;
 	u64 smf_ato_signal_sel;
-	u64 mfc_sdr_RW;
 	u64 tlb_index_hint_RO;
 	u64 tlb_index_W;
 	u64 tlb_vpn_RW;

include/asm-powerpc/spu_priv1.h

@@ -37,7 +37,7 @@ struct spu_priv1_ops
 	u64 (*mfc_dar_get) (struct spu *spu);
 	u64 (*mfc_dsisr_get) (struct spu *spu);
 	void (*mfc_dsisr_set) (struct spu *spu, u64 dsisr);
-	void (*mfc_sdr_set) (struct spu *spu, u64 sdr);
+	void (*mfc_sdr_setup) (struct spu *spu);
 	void (*mfc_sr1_set) (struct spu *spu, u64 sr1);
 	u64 (*mfc_sr1_get) (struct spu *spu);
 	void (*mfc_tclass_id_set) (struct spu *spu, u64 tclass_id);
@@ -112,9 +112,9 @@ spu_mfc_dsisr_set (struct spu *spu, u64 dsisr)
 }
 
 static inline void
-spu_mfc_sdr_set (struct spu *spu, u64 sdr)
+spu_mfc_sdr_setup (struct spu *spu)
 {
-	spu_priv1_ops->mfc_sdr_set(spu, sdr);
+	spu_priv1_ops->mfc_sdr_setup(spu);
 }
 
 static inline void