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From cd04a0500d70ea012089ec38183f20c0c30f8ba5 Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
Date: Fri, 27 Feb 2009 12:31:58 +0100
Subject: [PATCH 2/8] drm: Add a tracker for global objects.
Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
---
drivers/gpu/drm/Makefile | 3 +-
drivers/gpu/drm/drm_drv.c | 3 +
drivers/gpu/drm/drm_global.c | 107 ++++++++++++++++++++++++++++++++++++++++++
include/drm/drmP.h | 20 ++++++++
4 files changed, 132 insertions(+), 1 deletions(-)
create mode 100644 drivers/gpu/drm/drm_global.c
Index: linux-2.6.28/drivers/gpu/drm/Makefile
===================================================================
--- linux-2.6.28.orig/drivers/gpu/drm/Makefile 2009-03-12 13:13:54.000000000 +0000
+++ linux-2.6.28/drivers/gpu/drm/Makefile 2009-03-12 13:15:18.000000000 +0000
@@ -10,7 +10,8 @@
drm_lock.o drm_memory.o drm_proc.o drm_stub.o drm_vm.o \
drm_agpsupport.o drm_scatter.o ati_pcigart.o drm_pci.o \
drm_sysfs.o drm_hashtab.o drm_sman.o drm_mm.o \
- drm_crtc.o drm_crtc_helper.o drm_modes.o drm_edid.o
+ drm_crtc.o drm_crtc_helper.o drm_modes.o drm_edid.o \
+ drm_global.o
drm-$(CONFIG_COMPAT) += drm_ioc32.o
Index: linux-2.6.28/drivers/gpu/drm/drm_drv.c
===================================================================
--- linux-2.6.28.orig/drivers/gpu/drm/drm_drv.c 2009-03-12 13:13:54.000000000 +0000
+++ linux-2.6.28/drivers/gpu/drm/drm_drv.c 2009-03-12 13:37:56.000000000 +0000
@@ -382,6 +382,8 @@
DRM_INFO("Initialized %s %d.%d.%d %s\n",
CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
+ drm_global_init();
+
return 0;
err_p3:
drm_sysfs_destroy();
@@ -395,6 +397,7 @@
static void __exit drm_core_exit(void)
{
+ drm_global_release();
remove_proc_entry("dri", NULL);
drm_sysfs_destroy();
Index: linux-2.6.28/drivers/gpu/drm/drm_global.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.28/drivers/gpu/drm/drm_global.c 2009-03-12 13:15:18.000000000 +0000
@@ -0,0 +1,107 @@
+/**************************************************************************
+ *
+ * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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 <drmP.h>
+struct drm_global_item {
+ struct mutex mutex;
+ void *object;
+ int refcount;
+};
+
+static struct drm_global_item glob[DRM_GLOBAL_NUM];
+
+void drm_global_init(void)
+{
+ int i;
+
+ for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
+ struct drm_global_item *item = &glob[i];
+ mutex_init(&item->mutex);
+ item->object = NULL;
+ item->refcount = 0;
+ }
+}
+
+void drm_global_release(void)
+{
+ int i;
+ for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
+ struct drm_global_item *item = &glob[i];
+ BUG_ON(item->object != NULL);
+ BUG_ON(item->refcount != 0);
+ }
+}
+
+int drm_global_item_ref(struct drm_global_reference *ref)
+{
+ int ret;
+ struct drm_global_item *item = &glob[ref->global_type];
+ void *object;
+
+ mutex_lock(&item->mutex);
+ if (item->refcount == 0) {
+ item->object = kmalloc(ref->size, GFP_KERNEL);
+ if (unlikely(item->object == NULL)) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ ref->object = item->object;
+ ret = ref->init(ref);
+ if (unlikely(ret != 0))
+ goto out_err;
+
+ ++item->refcount;
+ }
+ ref->object = item->object;
+ object = item->object;
+ mutex_unlock(&item->mutex);
+ return 0;
+ out_err:
+ kfree(item->object);
+ mutex_unlock(&item->mutex);
+ item->object = NULL;
+ return ret;
+}
+
+EXPORT_SYMBOL(drm_global_item_ref);
+
+void drm_global_item_unref(struct drm_global_reference *ref)
+{
+ struct drm_global_item *item = &glob[ref->global_type];
+
+ mutex_lock(&item->mutex);
+ BUG_ON(item->refcount == 0);
+ BUG_ON(ref->object != item->object);
+ if (--item->refcount == 0) {
+ ref->release(ref);
+ kfree(item->object);
+ item->object = NULL;
+ }
+ mutex_unlock(&item->mutex);
+}
+
+EXPORT_SYMBOL(drm_global_item_unref);
Index: linux-2.6.28/include/drm/drmP.h
===================================================================
--- linux-2.6.28.orig/include/drm/drmP.h 2009-03-12 13:15:05.000000000 +0000
+++ linux-2.6.28/include/drm/drmP.h 2009-03-12 13:37:56.000000000 +0000
@@ -1412,5 +1412,25 @@
/*@}*/
+enum drm_global_types {
+ DRM_GLOBAL_TTM_MEM = 0,
+ DRM_GLOBAL_TTM_BO,
+ DRM_GLOBAL_TTM_OBJECT,
+ DRM_GLOBAL_NUM
+};
+
+struct drm_global_reference {
+ enum drm_global_types global_type;
+ size_t size;
+ void *object;
+ int (*init) (struct drm_global_reference *);
+ void (*release) (struct drm_global_reference *);
+};
+
+extern void drm_global_init(void);
+extern void drm_global_release(void);
+extern int drm_global_item_ref(struct drm_global_reference *ref);
+extern void drm_global_item_unref(struct drm_global_reference *ref);
+
#endif /* __KERNEL__ */
#endif
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