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Message-Id: <1337094428-20453-7-git-send-email-astiegmann@vmware.com>
Date: Tue, 15 May 2012 08:07:03 -0700
From: "Andrew Stiegmann (stieg)" <astiegmann@...are.com>
To: linux-kernel@...r.kernel.org
Cc: acking@...are.com, dtor@...are.com, dsouders@...are.com,
cschamp@...are.com, gregkh@...uxfoundation.org,
akpm@...ux-foundation.org,
virtualization@...ts.linux-foundation.org,
"Andrew Stiegmann (stieg)" <astiegmann@...are.com>
Subject: [vmw_vmci RFC 06/11] Apply dynamic array code
This code adds support for dynamic arrays that will grow if they
need to.
Signed-off-by: Andrew Stiegmann (stieg) <astiegmann@...are.com>
---
drivers/misc/vmw_vmci/vmci_handle_array.c | 300 +++++++++++++++++++++++++++++
drivers/misc/vmw_vmci/vmci_handle_array.h | 50 +++++
2 files changed, 350 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/vmw_vmci/vmci_handle_array.c
create mode 100644 drivers/misc/vmw_vmci/vmci_handle_array.h
diff --git a/drivers/misc/vmw_vmci/vmci_handle_array.c b/drivers/misc/vmw_vmci/vmci_handle_array.c
new file mode 100644
index 0000000..799e66b
--- /dev/null
+++ b/drivers/misc/vmw_vmci/vmci_handle_array.c
@@ -0,0 +1,300 @@
+/*
+ * VMware VMCI Driver
+ *
+ * Copyright (C) 2012 VMware, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 and no later version.
+ *
+ * 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
+ */
+
+#include <linux/slab.h>
+
+#include "vmci_common_int.h"
+#include "vmci_handle_array.h"
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * handle_arr_calc_size --
+ *
+ * Results:
+ * Size in bytes of the handle array.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+static unsigned handle_arr_calc_size(uint32_t c) {
+ /* Decrement c b/c vmci_handle_arr includes one vmci_handle entry */
+ return sizeof (struct vmci_handle_arr) +
+ --c * sizeof(struct vmci_handle);
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_create --
+ *
+ * Results:
+ * Array if successful, NULL if not.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+struct vmci_handle_arr *vmci_handle_arr_create(uint32_t capacity)
+{
+ struct vmci_handle_arr *array;
+ uint32_t arr_size;
+
+ if (capacity == 0)
+ capacity = VMCI_HANDLE_ARRAY_DEFAULT_SIZE;
+
+ arr_size = handle_arr_calc_size(capacity);
+ array = kmalloc(arr_size, GFP_ATOMIC);
+ if (!array)
+ return NULL;
+
+ array->capacity = capacity;
+ array->size = 0;
+
+ return array;
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_destroy --
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+void vmci_handle_arr_destroy(struct vmci_handle_arr *array)
+{
+ kfree(array);
+}
+
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_append_entry --
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * Array may be reallocated.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+void vmci_handle_arr_append_entry(struct vmci_handle_arr **arrayPtr,
+ struct vmci_handle handle)
+{
+ struct vmci_handle_arr *array;
+
+ ASSERT(arrayPtr && *arrayPtr);
+ array = *arrayPtr;
+
+ if (unlikely(array->size >= array->capacity)) {
+ /* reallocate. */
+ struct vmci_handle_arr *newArray;
+ const uint32_t arraySize =
+ handle_arr_calc_size(array->capacity *
+ VMCI_ARR_CAP_MULT);
+
+ newArray = kmalloc(arraySize, GFP_ATOMIC);
+ if (!newArray)
+ return;
+
+ memcpy(newArray, array, arraySize);
+ newArray->capacity *= VMCI_ARR_CAP_MULT;
+ kfree(array);
+ *arrayPtr = newArray;
+ array = newArray;
+ }
+
+ array->entries[array->size] = handle;
+ array->size++;
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_remove_entry --
+ *
+ * Results:
+ * Handle that was removed, VMCI_INVALID_HANDLE if entry not found.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array,
+ struct vmci_handle entryHandle)
+{
+ uint32_t i;
+ struct vmci_handle handle = VMCI_INVALID_HANDLE;
+
+ ASSERT(array);
+ for (i = 0; i < array->size; i++) {
+ if (VMCI_HANDLE_EQUAL(array->entries[i], entryHandle)) {
+ handle = array->entries[i];
+ array->size--;
+ array->entries[i] = array->entries[array->size];
+ array->entries[array->size] = VMCI_INVALID_HANDLE;
+ break;
+ }
+ }
+
+ return handle;
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_remove_tail --
+ *
+ * Results:
+ * Handle that was removed, VMCI_INVALID_HANDLE if array was empty.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array)
+{
+ struct vmci_handle handle = VMCI_INVALID_HANDLE;
+
+ if (array->size) {
+ array->size--;
+ handle = array->entries[array->size];
+ array->entries[array->size] = VMCI_INVALID_HANDLE;
+ }
+
+ return handle;
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_get_entry --
+ *
+ * Results:
+ * Handle at given index, VMCI_INVALID_HANDLE if invalid index.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+struct vmci_handle
+vmci_handle_arr_get_entry(const struct vmci_handle_arr *array, uint32_t index)
+{
+ ASSERT(array);
+
+ if (unlikely(index >= array->size))
+ return VMCI_INVALID_HANDLE;
+
+ return array->entries[index];
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_get_size --
+ *
+ * Results:
+ * Number of entries in array.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+uint32_t vmci_handle_arr_get_size(const struct vmci_handle_arr *array)
+{
+ ASSERT(array);
+ return array->size;
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_has_entry --
+ *
+ * Results:
+ * true is entry exists in array, false if not.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+bool
+vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,
+ struct vmci_handle entryHandle)
+{
+ uint32_t i;
+
+ ASSERT(array);
+ for (i = 0; i < array->size; i++)
+ if (VMCI_HANDLE_EQUAL(array->entries[i], entryHandle))
+ return true;
+
+ return false;
+}
+
+/*
+ *-----------------------------------------------------------------------------------
+ *
+ * vmci_handle_arr_get_handles --
+ *
+ * Results:
+ * NULL if the array is empty. Otherwise, a pointer to the array
+ * of VMCI handles in the handle array.
+ *
+ * Side effects:
+ * None.
+ *
+ *-----------------------------------------------------------------------------------
+ */
+
+struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array) // IN
+{
+ ASSERT(array);
+
+ if (array->size)
+ return array->entries;
+
+ return NULL;
+}
+
diff --git a/drivers/misc/vmw_vmci/vmci_handle_array.h b/drivers/misc/vmw_vmci/vmci_handle_array.h
new file mode 100644
index 0000000..6d9e93e
--- /dev/null
+++ b/drivers/misc/vmw_vmci/vmci_handle_array.h
@@ -0,0 +1,50 @@
+/*
+ * VMware VMCI Driver
+ *
+ * Copyright (C) 2012 VMware, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 and no later version.
+ *
+ * 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
+ */
+
+#ifndef _VMCI_HANDLE_ARRAY_H_
+#define _VMCI_HANDLE_ARRAY_H_
+
+#include <linux/slab.h>
+
+#include <linux/vmw_vmci_defs.h>
+
+#define VMCI_HANDLE_ARRAY_DEFAULT_SIZE 4
+#define VMCI_ARR_CAP_MULT 2 /* Array capacity multiplier */
+
+struct vmci_handle_arr {
+ uint32_t capacity;
+ uint32_t size;
+ struct vmci_handle entries[1];
+};
+
+struct vmci_handle_arr *vmci_handle_arr_create(uint32_t capacity);
+void vmci_handle_arr_destroy(struct vmci_handle_arr *array);
+void vmci_handle_arr_append_entry(struct vmci_handle_arr **arrayPtr,
+ struct vmci_handle handle);
+struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array,
+ struct vmci_handle entryHandle);
+struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array);
+struct vmci_handle vmci_handle_arr_get_entry(const struct vmci_handle_arr *array,
+ uint32_t index);
+uint32_t vmci_handle_arr_get_size(const struct vmci_handle_arr *array);
+bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,
+ struct vmci_handle entryHandle);
+struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array);
+
+#endif /* _VMCI_HANDLE_ARRAY_H_ */
--
1.7.0.4
--
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