1 files changed, 48 insertions, 58 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_module.c b/drivers/gpu/drm/ttm/ttm_module.c
index d7f92fe9d904..aa137ead5cc5 100644
--- a/drivers/gpu/drm/ttm/ttm_module.c
+++ b/drivers/gpu/drm/ttm/ttm_module.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
 /**************************************************************************
  *
  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
@@ -30,73 +31,62 @@
  */
 #include <linux/module.h>
 #include <linux/device.h>
+#include <linux/pgtable.h>
 #include <linux/sched.h>
-#include <drm/ttm/ttm_module.h>
+#include <linux/debugfs.h>
 #include <drm/drm_sysfs.h>
+#include <drm/ttm/ttm_caching.h>
 
-static DECLARE_WAIT_QUEUE_HEAD(exit_q);
-atomic_t device_released;
+#include "ttm_module.h"
 
-static struct device_type ttm_drm_class_type = {
-	.name = "ttm",
-	/**
-	 * Add pm ops here.
-	 */
-};
-
-static void ttm_drm_class_device_release(struct device *dev)
-{
-	atomic_set(&device_released, 1);
-	wake_up_all(&exit_q);
-}
-
-static struct device ttm_drm_class_device = {
-	.type = &ttm_drm_class_type,
-	.release = &ttm_drm_class_device_release
-};
-
-struct kobject *ttm_get_kobj(void)
-{
-	struct kobject *kobj = &ttm_drm_class_device.kobj;
-	BUG_ON(kobj == NULL);
-	return kobj;
-}
-
-static int __init ttm_init(void)
-{
-	int ret;
-
-	ret = dev_set_name(&ttm_drm_class_device, "ttm");
-	if (unlikely(ret != 0))
-		return ret;
-
-	atomic_set(&device_released, 0);
-	ret = drm_class_device_register(&ttm_drm_class_device);
-	if (unlikely(ret != 0))
-		goto out_no_dev_reg;
-
-	return 0;
-out_no_dev_reg:
-	atomic_set(&device_released, 1);
-	wake_up_all(&exit_q);
-	return ret;
-}
+/**
+ * DOC: TTM
+ *
+ * TTM is a memory manager for accelerator devices with dedicated memory.
+ *
+ * The basic idea is that resources are grouped together in buffer objects of
+ * certain size and TTM handles lifetime, movement and CPU mappings of those
+ * objects.
+ *
+ * TODO: Add more design background and information here.
+ */
 
-static void __exit ttm_exit(void)
+/**
+ * ttm_prot_from_caching - Modify the page protection according to the
+ * ttm cacing mode
+ * @caching: The ttm caching mode
+ * @tmp: The original page protection
+ *
+ * Return: The modified page protection
+ */
+pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp)
 {
-	drm_class_device_unregister(&ttm_drm_class_device);
+	/* Cached mappings need no adjustment */
+	if (caching == ttm_cached)
+		return tmp;
 
-	/**
-	 * Refuse to unload until the TTM device is released.
-	 * Not sure this is 100% needed.
-	 */
-
-	wait_event(exit_q, atomic_read(&device_released) == 1);
+#if defined(__i386__) || defined(__x86_64__)
+	if (caching == ttm_write_combined)
+		tmp = pgprot_writecombine(tmp);
+#ifndef CONFIG_UML
+	else if (boot_cpu_data.x86 > 3)
+		tmp = pgprot_noncached(tmp);
+#endif /* CONFIG_UML */
+#endif /* __i386__ || __x86_64__ */
+#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
+	defined(__powerpc__) || defined(__mips__) || defined(__loongarch__) || \
+	defined(__riscv)
+	if (caching == ttm_write_combined)
+		tmp = pgprot_writecombine(tmp);
+	else
+		tmp = pgprot_noncached(tmp);
+#endif
+#if defined(__sparc__)
+	tmp = pgprot_noncached(tmp);
+#endif
+	return tmp;
 }
 
-module_init(ttm_init);
-module_exit(ttm_exit);
-
 MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
 MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
 MODULE_LICENSE("GPL and additional rights");