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Message-Id: <1329267955-32367-9-git-send-email-astiegmann@vmware.com>
Date: Tue, 14 Feb 2012 17:05:49 -0800
From: "Andrew Stiegmann (stieg)" <astiegmann@...are.com>
To: linux-kernel@...r.kernel.org
Cc: vm-crosstalk@...are.com, dtor@...are.com, cschamp@...are.com,
"Andrew Stiegmann (stieg)" <astiegmann@...are.com>
Subject: [PATCH 08/14] Add vmciResource.*
---
drivers/misc/vmw_vmci/vmciResource.c | 383 ++++++++++++++++++++++++++++++++++
drivers/misc/vmw_vmci/vmciResource.h | 68 ++++++
2 files changed, 451 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/vmw_vmci/vmciResource.c
create mode 100644 drivers/misc/vmw_vmci/vmciResource.h
diff --git a/drivers/misc/vmw_vmci/vmciResource.c b/drivers/misc/vmw_vmci/vmciResource.c
new file mode 100644
index 0000000..f4a3710
--- /dev/null
+++ b/drivers/misc/vmw_vmci/vmciResource.c
@@ -0,0 +1,383 @@
+/*
+ *
+ * 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 "vmci_defs.h"
+#include "vmci_infrastructure.h"
+#include "vmci_kernel_if.h"
+#include "vmciCommonInt.h"
+#include "vmciHashtable.h"
+#include "vmciResource.h"
+#include "vmciDriver.h"
+
+#define LGPFX "VMCIResource: "
+
+/* 0 through VMCI_RESERVED_RESOURCE_ID_MAX are reserved. */
+static uint32_t resourceID = VMCI_RESERVED_RESOURCE_ID_MAX + 1;
+static spinlock_t resourceIdLock;
+static struct vmci_hash_table *resourceTable = NULL;
+
+/* Public Resource Access Control API. */
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Init --
+ *
+ * Initializes the VMCI Resource Access Control API. Creates a hashtable
+ * to hold all resources, and registers vectors and callbacks for
+ * hypercalls.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIResource_Init(void)
+{
+ spin_lock_init(&resourceIdLock);
+
+ resourceTable = VMCIHashTable_Create(128);
+ if (resourceTable == NULL) {
+ VMCI_WARNING((LGPFX
+ "Failed creating a resource hash table for VMCI.\n"));
+ return VMCI_ERROR_NO_MEM;
+ }
+
+ return VMCI_SUCCESS;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Exit --
+ *
+ * Cleans up resources.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+void VMCIResource_Exit(void)
+{
+ if (resourceTable)
+ VMCIHashTable_Destroy(resourceTable);
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_GetID --
+ *
+ * Return resource ID. The first VMCI_RESERVED_RESOURCE_ID_MAX are
+ * reserved so we start from its value + 1.
+ *
+ * Result:
+ * VMCI resource id on success, VMCI_INVALID_ID on failure.
+ *
+ * Side effects:
+ * None.
+ *
+ *
+ *------------------------------------------------------------------------------
+ */
+
+uint32_t VMCIResource_GetID(uint32_t contextID)
+{
+ uint32_t oldRID = resourceID;
+ uint32_t currentRID;
+ bool foundRID = false;
+
+ /*
+ * Generate a unique resource ID. Keep on trying until we wrap around
+ * in the RID space.
+ */
+ ASSERT(oldRID > VMCI_RESERVED_RESOURCE_ID_MAX);
+
+ do {
+ struct vmci_handle handle;
+
+ spin_lock(&resourceIdLock);
+ currentRID = resourceID;
+ handle = VMCI_MAKE_HANDLE(contextID, currentRID);
+ resourceID++;
+ if (unlikely(resourceID == VMCI_INVALID_ID)) {
+ /*
+ * Skip the reserved rids.
+ */
+
+ resourceID = VMCI_RESERVED_RESOURCE_ID_MAX + 1;
+ }
+ spin_unlock(&resourceIdLock);
+ foundRID = !VMCIHashTable_EntryExists(resourceTable, handle);
+ } while (!foundRID && resourceID != oldRID);
+
+ if (unlikely(!foundRID)) {
+ return VMCI_INVALID_ID;
+ } else {
+ return currentRID;
+ }
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Add --
+ *
+ * Results:
+ * VMCI_SUCCESS if successful, error code if not.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIResource_Add(struct vmci_resource *resource, // IN
+ enum vmci_resource_type resourceType, // IN
+ struct vmci_handle resourceHandle, // IN
+ VMCIResourceFreeCB containerFreeCB, // IN
+ void *containerObject) // IN
+{
+ int result;
+
+ ASSERT(resource);
+
+ if (VMCI_HANDLE_EQUAL(resourceHandle, VMCI_INVALID_HANDLE)) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX
+ "Invalid argument resource (handle=0x%x:0x%x).\n",
+ resourceHandle.context,
+ resourceHandle.resource));
+ return VMCI_ERROR_INVALID_ARGS;
+ }
+
+ VMCIHashTable_InitEntry(&resource->hashEntry, resourceHandle);
+ resource->type = resourceType;
+ resource->containerFreeCB = containerFreeCB;
+ resource->containerObject = containerObject;
+
+ /* Add resource to hashtable. */
+ result = VMCIHashTable_AddEntry(resourceTable, &resource->hashEntry);
+ if (result != VMCI_SUCCESS) {
+ VMCI_DEBUG_LOG(4,
+ (LGPFX "Failed to add entry to hash table "
+ "(result=%d).\n", result));
+ return result;
+ }
+
+ return result;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Remove --
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+void VMCIResource_Remove(struct vmci_handle resourceHandle, // IN:
+ enum vmci_resource_type resourceType) // IN:
+{
+ struct vmci_resource *resource =
+ VMCIResource_Get(resourceHandle, resourceType);
+ if (resource == NULL)
+ return;
+
+ /* Remove resource from hashtable. */
+ VMCIHashTable_RemoveEntry(resourceTable, &resource->hashEntry);
+
+ VMCIResource_Release(resource);
+ /* resource could be freed by now. */
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Get --
+ *
+ * Results:
+ * Resource is successful. Otherwise NULL.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+struct vmci_resource *VMCIResource_Get(struct vmci_handle resourceHandle, // IN
+ enum vmci_resource_type resourceType) // IN
+{
+ struct vmci_resource *resource;
+ struct vmci_hash_entry *entry =
+ VMCIHashTable_GetEntry(resourceTable, resourceHandle);
+ if (entry == NULL) {
+ return NULL;
+ }
+ resource = RESOURCE_CONTAINER(entry, struct vmci_resource, hashEntry);
+ if (resourceType == VMCI_RESOURCE_TYPE_ANY
+ || resource->type == resourceType) {
+ return resource;
+ }
+ VMCIHashTable_ReleaseEntry(resourceTable, entry);
+ return NULL;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Hold --
+ *
+ * Hold the given resource. This will hold the hashtable entry. This
+ * is like doing a Get() but without having to lookup the resource by
+ * handle.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+void VMCIResource_Hold(struct vmci_resource *resource)
+{
+ ASSERT(resource);
+ VMCIHashTable_HoldEntry(resourceTable, &resource->hashEntry);
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResourceDoRemove --
+ *
+ * Deallocates data structures associated with the given resource
+ * and invoke any call back registered for the resource.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * May deallocate memory and invoke a callback for the removed resource.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+static void inline VMCIResourceDoRemove(struct vmci_resource *resource)
+{
+ ASSERT(resource);
+
+ if (resource->containerFreeCB) {
+ resource->containerFreeCB(resource->containerObject);
+ /* Resource has been freed don't dereference it. */
+ }
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Release --
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * resource's containerFreeCB will get called if last reference.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+int VMCIResource_Release(struct vmci_resource *resource)
+{
+ int result;
+
+ ASSERT(resource);
+
+ result =
+ VMCIHashTable_ReleaseEntry(resourceTable, &resource->hashEntry);
+ if (result == VMCI_SUCCESS_ENTRY_DEAD)
+ VMCIResourceDoRemove(resource);
+
+ /*
+ * We propagate the information back to caller in case it wants to know
+ * whether entry was freed.
+ */
+ return result;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Handle --
+ *
+ * Get the handle for the given resource.
+ *
+ * Results:
+ * The resource's associated handle.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+struct vmci_handle VMCIResource_Handle(struct vmci_resource *resource)
+{
+ ASSERT(resource);
+ return resource->hashEntry.handle;
+}
+
+/*
+ *------------------------------------------------------------------------------
+ *
+ * VMCIResource_Sync --
+ *
+ * Use this as a synchronization point when setting globals, for example,
+ * during device shutdown.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *------------------------------------------------------------------------------
+ */
+
+void VMCIResource_Sync(void)
+{
+ VMCIHashTable_Sync(resourceTable);
+}
diff --git a/drivers/misc/vmw_vmci/vmciResource.h b/drivers/misc/vmw_vmci/vmciResource.h
new file mode 100644
index 0000000..1c5d5f6
--- /dev/null
+++ b/drivers/misc/vmw_vmci/vmciResource.h
@@ -0,0 +1,68 @@
+/*
+ *
+ * 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_RESOURCE_H_
+#define _VMCI_RESOURCE_H_
+
+#include "vmci_defs.h"
+#include "vmci_kernel_if.h"
+#include "vmciHashtable.h"
+#include "vmciContext.h"
+
+#define RESOURCE_CONTAINER(ptr, type, member) \
+ ((type *)((char *)(ptr) - offsetof(type, member)))
+
+typedef void (*VMCIResourceFreeCB) (void *resource);
+
+enum vmci_resource_type {
+ VMCI_RESOURCE_TYPE_ANY,
+ VMCI_RESOURCE_TYPE_API,
+ VMCI_RESOURCE_TYPE_GROUP,
+ VMCI_RESOURCE_TYPE_DATAGRAM,
+ VMCI_RESOURCE_TYPE_DOORBELL,
+};
+
+struct vmci_resource {
+ struct vmci_hash_entry hashEntry;
+ enum vmci_resource_type type;
+ VMCIResourceFreeCB containerFreeCB; // Callback to free container
+ /* object when refCount is 0. */
+ void *containerObject; // Container object reference.
+};
+
+int VMCIResource_Init(void);
+void VMCIResource_Exit(void);
+void VMCIResource_Sync(void);
+
+uint32_t VMCIResource_GetID(uint32_t contextID);
+
+int VMCIResource_Add(struct vmci_resource *resource,
+ enum vmci_resource_type resourceType,
+ struct vmci_handle resourceHandle,
+ VMCIResourceFreeCB containerFreeCB, void *containerObject);
+void VMCIResource_Remove(struct vmci_handle resourceHandle,
+ enum vmci_resource_type resourceType);
+struct vmci_resource *VMCIResource_Get(struct vmci_handle resourceHandle,
+ enum vmci_resource_type resourceType);
+void VMCIResource_Hold(struct vmci_resource *resource);
+int VMCIResource_Release(struct vmci_resource *resource);
+struct vmci_handle VMCIResource_Handle(struct vmci_resource *resource);
+
+#endif /* _VMCI_RESOURCE_H_ */
--
1.7.0.4
--
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