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Diffstat (limited to 'drivers/scsi/isci/core/sci_base_memory_descriptor_list.c')
-rw-r--r--drivers/scsi/isci/core/sci_base_memory_descriptor_list.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/scsi/isci/core/sci_base_memory_descriptor_list.c b/drivers/scsi/isci/core/sci_base_memory_descriptor_list.c
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index 000000000000..86ae6a855399
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+++ b/drivers/scsi/isci/core/sci_base_memory_descriptor_list.c
@@ -0,0 +1,159 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * This file contains the base implementation for the memory descriptor list.
+ * This is currently comprised of MDL iterator methods.
+ *
+ *
+ */
+
+#include "sci_environment.h"
+#include "sci_base_memory_descriptor_list.h"
+
+/*
+ * ******************************************************************************
+ * * P U B L I C M E T H O D S
+ * ****************************************************************************** */
+
+void sci_mdl_first_entry(
+ struct sci_base_memory_descriptor_list *base_mdl)
+{
+ base_mdl->next_index = 0;
+
+ /*
+ * If this MDL is managing another MDL, then recursively rewind that MDL
+ * object as well. */
+ if (base_mdl->next_mdl != SCI_INVALID_HANDLE)
+ sci_mdl_first_entry(base_mdl->next_mdl);
+}
+
+
+void sci_mdl_next_entry(
+ struct sci_base_memory_descriptor_list *base_mdl)
+{
+ /*
+ * If there is at least one more entry left in the array, then change
+ * the next pointer to it. */
+ if (base_mdl->next_index < base_mdl->length)
+ base_mdl->next_index++;
+ else if (base_mdl->next_index == base_mdl->length) {
+ /*
+ * This MDL has exhausted it's set of entries. If this MDL is managing
+ * another MDL, then start iterating through that MDL. */
+ if (base_mdl->next_mdl != SCI_INVALID_HANDLE)
+ sci_mdl_next_entry(base_mdl->next_mdl);
+ }
+}
+
+
+struct sci_physical_memory_descriptor *sci_mdl_get_current_entry(
+ struct sci_base_memory_descriptor_list *base_mdl)
+{
+ if (base_mdl->next_index < base_mdl->length)
+ return &base_mdl->mde_array[base_mdl->next_index];
+ else if (base_mdl->next_index == base_mdl->length) {
+ /*
+ * This MDL has exhausted it's set of entries. If this MDL is managing
+ * another MDL, then return it's current entry. */
+ if (base_mdl->next_mdl != SCI_INVALID_HANDLE)
+ return sci_mdl_get_current_entry(base_mdl->next_mdl);
+ }
+
+ return NULL;
+}
+
+/*
+ * ******************************************************************************
+ * * P R O T E C T E D M E T H O D S
+ * ****************************************************************************** */
+
+void sci_base_mdl_construct(
+ struct sci_base_memory_descriptor_list *mdl,
+ struct sci_physical_memory_descriptor *mde_array,
+ u32 mde_array_length,
+ struct sci_base_memory_descriptor_list *next_mdl)
+{
+ mdl->length = mde_array_length;
+ mdl->mde_array = mde_array;
+ mdl->next_index = 0;
+ mdl->next_mdl = next_mdl;
+}
+
+/* --------------------------------------------------------------------------- */
+
+bool sci_base_mde_is_valid(
+ struct sci_physical_memory_descriptor *mde,
+ u32 alignment,
+ u32 size,
+ u16 attributes)
+{
+ /* Only need the lower 32 bits to ensure alignment is met. */
+ u32 physical_address = lower_32_bits(mde->physical_address);
+
+ if (
+ ((((unsigned long)mde->virtual_address) & (alignment - 1)) != 0)
+ || ((physical_address & (alignment - 1)) != 0)
+ || (mde->constant_memory_alignment != alignment)
+ || (mde->constant_memory_size != size)
+ || (mde->virtual_address == NULL)
+ || (mde->constant_memory_attributes != attributes)
+ ) {
+ return false;
+ }
+
+ return true;
+}
+