remove smp dead code (VPP-1066)

this follows commit 01d86c7f6f05938c7d3fe181bd0aa2f75ccdd1df
which removed many unused functions from smp.h

Change-Id: I3aa0954a5e2319cc526fa68dda113f3cbe063960
Signed-off-by: Gabriel Ganne <gabriel.ganne@enea.com>

1 files changed, 0 insertions, 325 deletions

diff --git a/src/vppinfra/smp.c b/src/vppinfra/smp.c
deleted file mode 100644
index f603283ef61..00000000000
--- a/src/vppinfra/smp.c
+++ /dev/null
@@ -1,325 +0,0 @@
-/*
- * Copyright (c) 2015 Cisco and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-/*
-  Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
-
-  Permission is hereby granted, free of charge, to any person obtaining
-  a copy of this software and associated documentation files (the
-  "Software"), to deal in the Software without restriction, including
-  without limitation the rights to use, copy, modify, merge, publish,
-  distribute, sublicense, and/or sell copies of the Software, and to
-  permit persons to whom the Software is furnished to do so, subject to
-  the following conditions:
-
-  The above copyright notice and this permission notice shall be
-  included in all copies or substantial portions of the Software.
-
-  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-*/
-
-#include <vppinfra/longjmp.h>
-#include <vppinfra/mheap.h>
-#include <vppinfra/os.h>
-
-void
-clib_smp_free (clib_smp_main_t * m)
-{
-  clib_mem_vm_free (m->vm_base,
-		    (uword) ((1 + m->n_cpus) << m->log2_n_per_cpu_vm_bytes));
-}
-
-static uword
-allocate_per_cpu_mheap (uword cpu)
-{
-  clib_smp_main_t *m = &clib_smp_main;
-  void *heap;
-  uword vm_size, stack_size, mheap_flags;
-
-  ASSERT (os_get_thread_index () == cpu);
-
-  vm_size = (uword) 1 << m->log2_n_per_cpu_vm_bytes;
-  stack_size = (uword) 1 << m->log2_n_per_cpu_stack_bytes;
-
-  mheap_flags = MHEAP_FLAG_SMALL_OBJECT_CACHE;
-
-  /* Heap extends up to start of stack. */
-  heap = mheap_alloc_with_flags (clib_smp_vm_base_for_cpu (m, cpu),
-				 vm_size - stack_size, mheap_flags);
-  clib_mem_set_heap (heap);
-
-  if (cpu == 0)
-    {
-      /* Now that we have a heap, allocate main structure on cpu 0. */
-      vec_resize (m->per_cpu_mains, m->n_cpus);
-
-      /* Allocate shared global heap (thread safe). */
-      m->global_heap =
-	mheap_alloc_with_flags (clib_smp_vm_base_for_cpu (m, cpu + m->n_cpus),
-				vm_size,
-				mheap_flags | MHEAP_FLAG_THREAD_SAFE);
-    }
-
-  m->per_cpu_mains[cpu].heap = heap;
-  return 0;
-}
-
-void
-clib_smp_init (void)
-{
-  clib_smp_main_t *m = &clib_smp_main;
-  uword cpu;
-
-  m->vm_base =
-    clib_mem_vm_alloc ((uword) (m->n_cpus + 1) << m->log2_n_per_cpu_vm_bytes);
-  if (!m->vm_base)
-    clib_error ("error allocating virtual memory");
-
-  for (cpu = 0; cpu < m->n_cpus; cpu++)
-    clib_calljmp (allocate_per_cpu_mheap, cpu,
-		  clib_smp_stack_top_for_cpu (m, cpu));
-}
-
-void
-clib_smp_lock_init (clib_smp_lock_t ** pl)
-{
-  clib_smp_lock_t *l;
-  uword i, n_bytes, n_fifo_elts;
-
-  /* No locking necessary if n_cpus <= 1.
-     Null means no locking is necessary. */
-  if (clib_smp_main.n_cpus < 2)
-    {
-      *pl = 0;
-      return;
-    }
-
-  /* Need n_cpus - 1 elts in waiting fifo.  One CPU holds lock
-     and others could potentially be waiting. */
-  n_fifo_elts = clib_smp_main.n_cpus - 1;
-
-  n_bytes = sizeof (l[0]) + n_fifo_elts * sizeof (l->waiting_fifo[0]);
-  ASSERT_AND_PANIC (n_bytes % CLIB_CACHE_LINE_BYTES == 0);
-
-  l = clib_mem_alloc_aligned (n_bytes, CLIB_CACHE_LINE_BYTES);
-
-  memset (l, 0, n_bytes);
-  l->n_waiting_fifo_elts = n_fifo_elts;
-
-  for (i = 0; i < l->n_waiting_fifo_elts; i++)
-    l->waiting_fifo[i].wait_type = CLIB_SMP_LOCK_WAIT_EMPTY;
-
-  *pl = l;
-}
-
-void
-clib_smp_lock_free (clib_smp_lock_t ** pl)
-{
-  if (*pl)
-    clib_mem_free (*pl);
-  *pl = 0;
-}
-
-void
-clib_smp_lock_slow_path (clib_smp_lock_t * l,
-			 uword my_cpu,
-			 clib_smp_lock_header_t h0, clib_smp_lock_type_t type)
-{
-  clib_smp_lock_header_t h1, h2, h3;
-  uword is_reader = type == CLIB_SMP_LOCK_TYPE_READER;
-  uword n_fifo_elts = l->n_waiting_fifo_elts;
-  uword my_tail;
-
-  /* Atomically advance waiting FIFO tail pointer; my_tail will point
-     to entry where we can insert ourselves to wait for lock to be granted. */
-  while (1)
-    {
-      h1 = h0;
-      my_tail = h1.waiting_fifo.head_index + h1.waiting_fifo.n_elts;
-      my_tail = my_tail >= n_fifo_elts ? my_tail - n_fifo_elts : my_tail;
-      h1.waiting_fifo.n_elts += 1;
-      h1.request_cpu = my_cpu;
-
-      ASSERT_AND_PANIC (h1.waiting_fifo.n_elts <= n_fifo_elts);
-      ASSERT_AND_PANIC (my_tail >= 0 && my_tail < n_fifo_elts);
-
-      h2 = clib_smp_lock_set_header (l, h1, h0);
-
-      /* Tail successfully advanced? */
-      if (clib_smp_lock_header_is_equal (h0, h2))
-	break;
-
-      /* It is possible that if head and tail are both zero, CPU with lock would have unlocked lock. */
-      else if (type == CLIB_SMP_LOCK_TYPE_SPIN)
-	{
-	  while (!h2.writer_has_lock)
-	    {
-	      ASSERT_AND_PANIC (h2.waiting_fifo.n_elts == 0);
-	      h1 = h2;
-	      h1.request_cpu = my_cpu;
-	      h1.writer_has_lock = 1;
-
-	      h3 = clib_smp_lock_set_header (l, h1, h2);
-
-	      /* Got it? */
-	      if (clib_smp_lock_header_is_equal (h2, h3))
-		return;
-
-	      h2 = h3;
-	    }
-	}
-
-      /* Try to advance tail again. */
-      h0 = h2;
-    }
-
-  {
-    clib_smp_lock_waiting_fifo_elt_t *w;
-
-    w = l->waiting_fifo + my_tail;
-
-    while (w->wait_type != CLIB_SMP_LOCK_WAIT_EMPTY)
-      clib_smp_pause ();
-
-    w->wait_type = (is_reader
-		    ? CLIB_SMP_LOCK_WAIT_READER : CLIB_SMP_LOCK_WAIT_WRITER);
-
-    /* Wait until CPU holding the lock grants us the lock. */
-    while (w->wait_type != CLIB_SMP_LOCK_WAIT_DONE)
-      clib_smp_pause ();
-
-    w->wait_type = CLIB_SMP_LOCK_WAIT_EMPTY;
-  }
-}
-
-void
-clib_smp_unlock_slow_path (clib_smp_lock_t * l,
-			   uword my_cpu,
-			   clib_smp_lock_header_t h0,
-			   clib_smp_lock_type_t type)
-{
-  clib_smp_lock_header_t h1, h2;
-  clib_smp_lock_waiting_fifo_elt_t *head;
-  clib_smp_lock_wait_type_t head_wait_type;
-  uword is_reader = type == CLIB_SMP_LOCK_TYPE_READER;
-  uword n_fifo_elts = l->n_waiting_fifo_elts;
-  uword head_index, must_wait_for_readers;
-
-  while (1)
-    {
-      /* Advance waiting fifo giving lock to first waiter. */
-      while (1)
-	{
-	  ASSERT_AND_PANIC (h0.waiting_fifo.n_elts != 0);
-
-	  h1 = h0;
-
-	  head_index = h1.waiting_fifo.head_index;
-	  head = l->waiting_fifo + head_index;
-	  if (is_reader)
-	    {
-	      ASSERT_AND_PANIC (h1.n_readers_with_lock > 0);
-	      h1.n_readers_with_lock -= 1;
-	    }
-	  else
-	    {
-	      /* Writer will already have lock. */
-	      ASSERT_AND_PANIC (h1.writer_has_lock);
-	    }
-
-	  while ((head_wait_type =
-		  head->wait_type) == CLIB_SMP_LOCK_WAIT_EMPTY)
-	    clib_smp_pause ();
-
-	  /* Don't advance FIFO to writer unless all readers have unlocked. */
-	  must_wait_for_readers =
-	    (type != CLIB_SMP_LOCK_TYPE_SPIN
-	     && head_wait_type == CLIB_SMP_LOCK_WAIT_WRITER
-	     && h1.n_readers_with_lock != 0);
-
-	  if (!must_wait_for_readers)
-	    {
-	      head_index += 1;
-	      h1.waiting_fifo.n_elts -= 1;
-	      if (type != CLIB_SMP_LOCK_TYPE_SPIN)
-		{
-		  if (head_wait_type == CLIB_SMP_LOCK_WAIT_WRITER)
-		    h1.writer_has_lock = h1.n_readers_with_lock == 0;
-		  else
-		    {
-		      h1.writer_has_lock = 0;
-		      h1.n_readers_with_lock += 1;
-		    }
-		}
-	    }
-
-	  h1.waiting_fifo.head_index =
-	    head_index == n_fifo_elts ? 0 : head_index;
-	  h1.request_cpu = my_cpu;
-
-	  ASSERT_AND_PANIC (h1.waiting_fifo.head_index >= 0
-			    && h1.waiting_fifo.head_index < n_fifo_elts);
-	  ASSERT_AND_PANIC (h1.waiting_fifo.n_elts >= 0
-			    && h1.waiting_fifo.n_elts <= n_fifo_elts);
-
-	  h2 = clib_smp_lock_set_header (l, h1, h0);
-
-	  if (clib_smp_lock_header_is_equal (h2, h0))
-	    break;
-
-	  h0 = h2;
-
-	  if (h0.waiting_fifo.n_elts == 0)
-	    return clib_smp_unlock_inline (l, type);
-	}
-
-      if (must_wait_for_readers)
-	return;
-
-      /* Wake up head of waiting fifo. */
-      {
-	uword done_waking;
-
-	/* Shift lock to first thread waiting in fifo. */
-	head->wait_type = CLIB_SMP_LOCK_WAIT_DONE;
-
-	/* For read locks we may be able to wake multiple readers. */
-	done_waking = 1;
-	if (head_wait_type == CLIB_SMP_LOCK_WAIT_READER)
-	  {
-	    uword hi = h0.waiting_fifo.head_index;
-	    if (h0.waiting_fifo.n_elts != 0
-		&& l->waiting_fifo[hi].wait_type == CLIB_SMP_LOCK_WAIT_READER)
-	      done_waking = 0;
-	  }
-
-	if (done_waking)
-	  break;
-      }
-    }
-}
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */