gpu: nvgpu: add user API to get read-only syncpoint address map

Add User space API NVGPU_AS_IOCTL_GET_SYNC_RO_MAP to get read-only syncpoint
address map in user space

We already map whole syncpoint shim to each address space with base address
being vm->syncpt_ro_map_gpu_va

This new API exposes this base GPU_VA address of syncpoint map, and unit size
of each syncpoint to user space.
User space can then calculate address of each syncpoint as
syncpoint_address = base_gpu_va + (syncpoint_id * syncpoint_unit_size)

Note that this syncpoint address is read_only, and should be only used for
inserting semaphore acquires.
Adding semaphore release with this address would result in MMU_FAULT

Define new HAL g->ops.fifo.get_sync_ro_map and set this for all GPUs supported
on Xavier SoC

Bug 200327559

Change-Id: Ica0db48fc28fdd0ff2a5eb09574dac843dc5e4fd
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1649365
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/vgpu/gv11b/vgpu_fifo_gv11b.h b/drivers/gpu/nvgpu/common/linux/vgpu/gv11b/vgpu_fifo_gv11b.h
index c2e75680..66f482af 100644
--- a/drivers/gpu/nvgpu/common/linux/vgpu/gv11b/vgpu_fifo_gv11b.h
+++ b/drivers/gpu/nvgpu/common/linux/vgpu/gv11b/vgpu_fifo_gv11b.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2017-2018, 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,
@@ -22,4 +22,6 @@ struct gk20a;
 int vgpu_gv11b_init_fifo_setup_hw(struct gk20a *g);
 int vgpu_gv11b_fifo_alloc_syncpt_buf(struct channel_gk20a *c,
                         u32 syncpt_id, struct nvgpu_mem *syncpt_buf);
+int vgpu_gv11b_fifo_get_sync_ro_map(struct vm_gk20a *vm,
+        u64 *base_gpuva, u32 *sync_size);
 #endif