gpu: nvgpu: add cg and pg function

Add new power/clock gating functions that can be called by
other units.

New clock_gating functions will reside in cg.c under
common/power_features/cg unit.

New power gating functions will reside in pg.c under
common/power_features/pg unit.

Use nvgpu_pg_elpg_disable and nvgpu_pg_elpg_enable to disable/enable
elpg and also in gr_gk20a_elpg_protected macro to access gr registers.

Add cg_pg_lock to make elpg_enabled, elcg_enabled, blcg_enabled
and slcg_enabled thread safe.

JIRA NVGPU-2014

Change-Id: I00d124c2ee16242c9a3ef82e7620fbb7f1297aff
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2025493
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
(cherry-picked from c90585856567a547173a8b207365b3a4a3ccdd57 in
dev-kernel)
Reviewed-on: https://git-master.nvidia.com/r/2108406
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/power_features/pg/pg.c b/drivers/gpu/nvgpu/common/power_features/pg/pg.c
new file mode 100644
index 00000000..fa31f4e3
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/power_features/pg/pg.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2019, NVIDIA CORPORATION.  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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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 <nvgpu/gk20a.h>
+#include <nvgpu/pmu.h>
+#include <nvgpu/power_features/pg.h>
+
+bool nvgpu_pg_elpg_is_enabled(struct gk20a *g)
+{
+        bool elpg_enabled;
+
+        nvgpu_log_fn(g, " ");
+
+        nvgpu_mutex_acquire(&g->cg_pg_lock);
+        elpg_enabled = g->elpg_enabled;
+        nvgpu_mutex_release(&g->cg_pg_lock);
+        return elpg_enabled;
+}
+
+int nvgpu_pg_elpg_enable(struct gk20a *g)
+{
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!g->can_elpg) {
+                return 0;
+        }
+
+        nvgpu_mutex_acquire(&g->cg_pg_lock);
+        if (g->elpg_enabled) {
+                err = nvgpu_pmu_pg_global_enable(g, true);
+        }
+        nvgpu_mutex_release(&g->cg_pg_lock);
+        return err;
+}
+
+int nvgpu_pg_elpg_disable(struct gk20a *g)
+{
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!g->can_elpg) {
+                return 0;
+        }
+
+        nvgpu_mutex_acquire(&g->cg_pg_lock);
+        if (g->elpg_enabled) {
+                err = nvgpu_pmu_pg_global_enable(g, false);
+        }
+        nvgpu_mutex_release(&g->cg_pg_lock);
+        return err;
+}
+
+int nvgpu_pg_elpg_set_elpg_enabled(struct gk20a *g, bool enable)
+{
+        int err = 0;
+        bool change_mode = false;
+
+        nvgpu_log_fn(g, " ");
+
+        if (!g->can_elpg) {
+                return 0;
+        }
+
+        nvgpu_mutex_acquire(&g->cg_pg_lock);
+        if (enable) {
+                if (!g->elpg_enabled) {
+                        change_mode = true;
+                        g->elpg_enabled = true;
+                }
+        } else {
+                if (g->elpg_enabled) {
+                        change_mode = true;
+                        g->elpg_enabled = false;
+                }
+        }
+        if (!change_mode) {
+                goto done;
+        }
+
+        err = nvgpu_pmu_pg_global_enable(g, enable);
+done:
+        nvgpu_mutex_release(&g->cg_pg_lock);
+        return err;
+}