[IA64] Add Variable Page Size and IA64 Support in Intel IOMMU

The patch contains Intel IOMMU IA64 specific code. It defines new
machvec dig_vtd, hooks for IOMMU, DMAR table detection, cache line flush
function, etc.

For a generic kernel with CONFIG_DMAR=y, if Intel IOMMU is detected,
dig_vtd is used for machinve vector. Otherwise, kernel falls back to
dig machine vector. Kernel parameter "machvec=dig" or "intel_iommu=off"
can be used to force kernel to boot dig machine vector.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/arch/ia64/lib/flush.S b/arch/ia64/lib/flush.S
index 2a0d27f2f21..1d8c8886006 100644
--- a/arch/ia64/lib/flush.S
+++ b/arch/ia64/lib/flush.S
@@ -60,3 +60,58 @@ GLOBAL_ENTRY(flush_icache_range)
         mov     ar.lc=r3                // restore ar.lc
         br.ret.sptk.many rp
 END(flush_icache_range)
+
+        /*
+         * clflush_cache_range(start,size)
+         *
+         *      Flush cache lines from start to start+size-1.
+         *
+         *      Must deal with range from start to start+size-1 but nothing else
+         *      (need to be careful not to touch addresses that may be
+         *      unmapped).
+         *
+         *      Note: "in0" and "in1" are preserved for debugging purposes.
+         */
+        .section .kprobes.text,"ax"
+GLOBAL_ENTRY(clflush_cache_range)
+
+        .prologue
+        alloc   r2=ar.pfs,2,0,0,0
+        movl    r3=ia64_cache_stride_shift
+        mov     r21=1
+        add     r22=in1,in0
+        ;;
+        ld8     r20=[r3]                // r20: stride shift
+        sub     r22=r22,r0,1            // last byte address
+        ;;
+        shr.u   r23=in0,r20             // start / (stride size)
+        shr.u   r22=r22,r20             // (last byte address) / (stride size)
+        shl     r21=r21,r20             // r21: stride size of the i-cache(s)
+        ;;
+        sub     r8=r22,r23              // number of strides - 1
+        shl     r24=r23,r20             // r24: addresses for "fc" =
+                                        //      "start" rounded down to stride
+                                        //      boundary
+        .save   ar.lc,r3
+        mov     r3=ar.lc                // save ar.lc
+        ;;
+
+        .body
+        mov     ar.lc=r8
+        ;;
+        /*
+         * 32 byte aligned loop, even number of (actually 2) bundles
+         */
+.Loop_fc:
+        fc      r24             // issuable on M0 only
+        add     r24=r21,r24     // we flush "stride size" bytes per iteration
+        nop.i   0
+        br.cloop.sptk.few .Loop_fc
+        ;;
+        sync.i
+        ;;
+        srlz.i
+        ;;
+        mov     ar.lc=r3                // restore ar.lc
+        br.ret.sptk.many rp
+END(clflush_cache_range)