gpu: nvgpu: Begin removing variables in struct gk20a

Begin removing all of the myriad flag variables in struct gk20a and
replace that with one API that checks for flags being enabled or
disabled. The API is as follows:

  bool nvgpu_is_enabled(struct gk20a *g, int flag);
  bool __nvgpu_set_enabled(struct gk20a *g, int flag, bool state);

These APIs allow many of the gk20a flags to be replaced by defines.
This makes flag usage consistent and saves a small amount of memory in
struct gk20a. Also it makes struct gk20a easier to read since there's
less clutter scattered through out.

JIRA NVGPU-84

Change-Id: I6525cecbe97c4e8379e5f53e29ef0b4dbd1a7fc2
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1488049
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/enabled.c b/drivers/gpu/nvgpu/common/enabled.c
new file mode 100644
index 00000000..d56f0551
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/enabled.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/enabled.h>
+#include <nvgpu/bitops.h>
+
+#include "gk20a/gk20a.h"
+
+int nvgpu_init_enabled_flags(struct gk20a *g)
+{
+        /*
+         * Zero all flags initially. Flags that should be set to non-zero states
+         * can be done so during driver init.
+         */
+        g->enabled_flags = nvgpu_kzalloc(g,
+                                         BITS_TO_LONGS(NVGPU_MAX_ENABLED_BITS) *
+                                         sizeof(unsigned long));
+        if (!g->enabled_flags)
+                return -ENOMEM;
+
+        return 0;
+}
+
+bool nvgpu_is_enabled(struct gk20a *g, int flag)
+{
+        return test_bit(flag, g->enabled_flags);
+}
+
+bool __nvgpu_set_enabled(struct gk20a *g, int flag, bool state)
+{
+        if (state)
+                return test_and_set_bit(flag, g->enabled_flags);
+        else
+                return test_and_clear_bit(flag, g->enabled_flags);
+}