powerpc/cell: Move data segment faulting code out of cell platform

__spu_trap_data_seg() currently contains code to determine the VSID and ESID
required for a particular EA and mm struct.

This code is generically useful for other co-processors. This moves the code of
the cell platform so it can be used by other powerpc code. It also adds 1TB
segment handling which Cell didn't support.  The new function is called
copro_calculate_slb().

This also moves the internal struct spu_slb to a generic struct copro_slb which
is now used in the Cell and copro code.  We use this new struct instead of
passing around esid and vsid parameters.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 46 insertions, 0 deletions

diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index ba7df14c6b82..a15a23efc0e2 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -24,6 +24,7 @@
 #include <linux/mm.h>
 #include <linux/export.h>
 #include <asm/reg.h>
+#include <asm/copro.h>
 
 /*
  * This ought to be kept in sync with the powerpc specific do_page_fault
@@ -90,3 +91,48 @@ out_unlock:
 	return ret;
 }
 EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
+
+int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
+{
+	u64 vsid;
+	int psize, ssize;
+
+	slb->esid = (ea & ESID_MASK) | SLB_ESID_V;
+
+	switch (REGION_ID(ea)) {
+	case USER_REGION_ID:
+		pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
+		psize = get_slice_psize(mm, ea);
+		ssize = user_segment_size(ea);
+		vsid = get_vsid(mm->context.id, ea, ssize);
+		break;
+	case VMALLOC_REGION_ID:
+		pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
+		if (ea < VMALLOC_END)
+			psize = mmu_vmalloc_psize;
+		else
+			psize = mmu_io_psize;
+		ssize = mmu_kernel_ssize;
+		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+		break;
+	case KERNEL_REGION_ID:
+		pr_devel("%s: 0x%llx -- KERNEL_REGION_ID\n", __func__, ea);
+		psize = mmu_linear_psize;
+		ssize = mmu_kernel_ssize;
+		vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
+		break;
+	default:
+		pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
+		return 1;
+	}
+
+	vsid = (vsid << slb_vsid_shift(ssize)) | SLB_VSID_USER;
+
+	vsid |= mmu_psize_defs[psize].sllp |
+		((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
+
+	slb->vsid = vsid;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(copro_calculate_slb);