drm/vmwgfx: Remove vmwgfx_hashtab

jira VULN-8161
cve CVE-2023-5633
commit-author Maaz Mombasawala <mombasawalam@vmware.com>
commit 9da30cd

The vmwgfx driver has migrated from using the hashtable in vmwgfx_hashtab
to the linux/hashtable implementation. Remove the vmwgfx_hashtab from the
driver.

	Signed-off-by: Maaz Mombasawala <mombasawalam@vmware.com>
	Reviewed-by: Martin Krastev <krastevm@vmware.com>
	Reviewed-by: Zack Rusin <zackr@vmware.com>
	Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221022040236.616490-12-zack@kde.org
(cherry picked from commit 9da30cd)
	Signed-off-by: Sultan Alsawaf <sultan@ciq.com>

Author: kerneltoast

drivers/gpu/drm/vmwgfx/Makefile

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-vmwgfx-y := vmwgfx_execbuf.o vmwgfx_gmr.o vmwgfx_hashtab.o vmwgfx_kms.o vmwgfx_drv.o \
+vmwgfx-y := vmwgfx_execbuf.o vmwgfx_gmr.o vmwgfx_kms.o vmwgfx_drv.o \
 	    vmwgfx_ioctl.o vmwgfx_resource.o vmwgfx_ttm_buffer.o \
 	    vmwgfx_cmd.o vmwgfx_irq.o vmwgfx_ldu.o vmwgfx_ttm_glue.o \
 	    vmwgfx_overlay.o vmwgfx_gmrid_manager.o vmwgfx_fence.o \

drivers/gpu/drm/vmwgfx/ttm_object.c

@@ -284,7 +284,7 @@ ttm_base_object_noref_lookup(struct ttm_object_file *tfile, uint64_t key)
 	}
 
 	__release(RCU);
-	return drm_hash_entry(hash, struct ttm_ref_object, hash)->obj;
+	return hlist_entry(hash, struct ttm_ref_object, hash)->obj;
 }
 EXPORT_SYMBOL(ttm_base_object_noref_lookup);
 
@@ -299,7 +299,7 @@ struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file *tfile,
 	ret = ttm_tfile_find_ref_rcu(tfile, key, &hash);
 
 	if (likely(ret == 0)) {
-		base = drm_hash_entry(hash, struct ttm_ref_object, hash)->obj;
+		base = hlist_entry(hash, struct ttm_ref_object, hash)->obj;
 		if (!kref_get_unless_zero(&base->refcount))
 			base = NULL;
 	}
@@ -343,7 +343,7 @@ int ttm_ref_object_add(struct ttm_object_file *tfile,
 		ret = ttm_tfile_find_ref_rcu(tfile, base->handle, &hash);
 
 		if (ret == 0) {
-			ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
+			ref = hlist_entry(hash, struct ttm_ref_object, hash);
 			if (kref_get_unless_zero(&ref->kref)) {
 				rcu_read_unlock();
 				break;
@@ -407,7 +407,7 @@ int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
 		spin_unlock(&tfile->lock);
 		return -EINVAL;
 	}
-	ref = drm_hash_entry(hash, struct ttm_ref_object, hash);
+	ref = hlist_entry(hash, struct ttm_ref_object, hash);
 	kref_put(&ref->kref, ttm_ref_object_release);
 	spin_unlock(&tfile->lock);
 	return 0;

drivers/gpu/drm/vmwgfx/ttm_object.h

@@ -42,8 +42,6 @@
 #include <linux/list.h>
 #include <linux/rcupdate.h>
 
-#include "vmwgfx_hashtab.h"
-
 /**
  * enum ttm_object_type
  *

drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf_res.c

@@ -88,7 +88,7 @@ vmw_cmdbuf_res_lookup(struct vmw_cmdbuf_res_manager *man,
 
 	hash_for_each_possible_rcu(man->resources, hash, head, key) {
 		if (hash->key == key)
-			return drm_hash_entry(hash, struct vmw_cmdbuf_res, hash)->res;
+			return hlist_entry(hash, struct vmw_cmdbuf_res, hash)->res;
 	}
 	return ERR_PTR(-EINVAL);
 }
@@ -243,7 +243,7 @@ int vmw_cmdbuf_res_remove(struct vmw_cmdbuf_res_manager *man,
 
 	hash_for_each_possible_rcu(man->resources, hash, head, key) {
 		if (hash->key == key) {
-			entry = drm_hash_entry(hash, struct vmw_cmdbuf_res, hash);
+			entry = hlist_entry(hash, struct vmw_cmdbuf_res, hash);
 			break;
 		}
 	}

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

@@ -43,7 +43,6 @@
 #include "ttm_object.h"
 
 #include "vmwgfx_fence.h"
-#include "vmwgfx_hashtab.h"
 #include "vmwgfx_reg.h"
 #include "vmwgfx_validation.h"
 
@@ -104,6 +103,11 @@ struct vmw_fpriv {
 	bool gb_aware; /* user-space is guest-backed aware */
 };
 
+struct vmwgfx_hash_item {
+	struct hlist_node head;
+	unsigned long key;
+};
+
 /**
  * struct vmw_buffer_object - TTM buffer object with vmwgfx additions
  * @base: The TTM buffer object