video: tegra: nvmap: add runtime busy/idle calls

CVSRAM falls under cvnas cluster. nvmap_alloc/free
from cvsram heap requires CV rail to be power ungated/gated.
Presently CV rail is always on/not power gated as CVNAS power
gating is called from driver remove and cvnas driver is statically loaded

The change registers runtime cvnas busy/idle callbacks at
cvsram carveout creation.
It exports CVNAS power gate(nvcvnas_idle()) and CVNAS power
ungate(nvcvnas_busy). The callbacks are used during  nvmap_alloc/free
from CVSRAM.

Bug 200383595

Change-Id: I545c18ea7bcf61bb6356e2d6d05c2f4f9b1f5368
Signed-off-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1666574
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Rajkumar Kasirajan <rkasirajan@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 19 insertions, 2 deletions

diff --git a/include/linux/nvmap.h b/include/linux/nvmap.h
index 1b8020e9b..6e441aad8 100644
--- a/include/linux/nvmap.h
+++ b/include/linux/nvmap.h
@@ -69,6 +69,21 @@ ulong nvmap_iovmm_get_used_pages(void);
 int nvmap_register_vidmem_carveout(struct device *dma_dev,
                 phys_addr_t base, size_t size);
 
+/*
+ * A heap can be mapped to memory other than DRAM.
+ * The HW, controls the memory, can be power gated/ungated
+ * based upon the clients using the memory.
+ * if no client/alloc happens from the memory, the HW needs
+ * to be power gated. Similarly it should power ungated if
+ * alloc happens from the memory.
+ * int (*busy)(void) - trigger runtime power ungate
+ * int (*idle)(void) - trigger runtime power gate
+ */
+struct nvmap_pm_ops {
+        int (*busy)(void);
+        int (*idle)(void);
+};
+
 struct nvmap_platform_carveout {
         const char *name;
         unsigned int usage_mask;
@@ -87,6 +102,7 @@ struct nvmap_platform_carveout {
         bool disable_dynamic_dma_map;
         bool no_cpu_access; /* carveout can't be accessed from cpu at all */
         bool init_done; /* FIXME: remove once all caveouts use reserved-memory */
+        struct nvmap_pm_ops pm_ops;
 };
 
 struct nvmap_platform_data {
diff --git a/include/linux/nvmap_t19x.h b/include/linux/nvmap_t19x.h
index 86e7271e3..0820e0618 100644
--- a/include/linux/nvmap_t19x.h
+++ b/include/linux/nvmap_t19x.h
@@ -3,7 +3,7 @@
  *
  * structure declarations for nvmem and nvmap user-space ioctls
  *
- * Copyright (c) 2009-2017, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2009-2018, 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,
@@ -25,7 +25,8 @@
 #define NVMAP_HEAP_CARVEOUT_GOS     (1ul<<24)
 
 int nvmap_register_cvsram_carveout(struct device *dma_dev,
-                phys_addr_t base, size_t size);
+                phys_addr_t base, size_t size,
+                int (*pmops_busy)(void), int (*pmops_idle)(void));
 
 struct cv_dev_info {
         struct device_node *np;