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, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
index 58367bcb..b3efdc8a 100644
--- a/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/hal_gm20b.c
@@ -436,6 +436,7 @@ static const struct gpu_ops gm20b_ops = {
                 .get_syncpt_wait_cmd_size = gk20a_fifo_get_syncpt_wait_cmd_size,
                 .add_syncpt_incr_cmd = gk20a_fifo_add_syncpt_incr_cmd,
                 .get_syncpt_incr_cmd_size = gk20a_fifo_get_syncpt_incr_cmd_size,
+                .get_sync_ro_map = NULL,
 #endif
         },
         .gr_ctx = {