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, 9 insertions, 1 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index 6821af07..41b4eb8d 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -1968,6 +1968,12 @@ struct nvgpu_as_map_buffer_batch_args {
         __u64 reserved;
 };
 
+struct nvgpu_as_get_sync_ro_map_args {
+        __u64 base_gpuva;
+        __u32 sync_size;
+        __u32 padding;
+};
+
 #define NVGPU_AS_IOCTL_BIND_CHANNEL \
         _IOWR(NVGPU_AS_IOCTL_MAGIC, 1, struct nvgpu_as_bind_channel_args)
 #define NVGPU32_AS_IOCTL_ALLOC_SPACE \
@@ -1990,9 +1996,11 @@ struct nvgpu_as_map_buffer_batch_args {
         _IOWR(NVGPU_AS_IOCTL_MAGIC, 10, struct nvgpu_as_map_buffer_compbits_args)
 #define NVGPU_AS_IOCTL_MAP_BUFFER_BATCH \
         _IOWR(NVGPU_AS_IOCTL_MAGIC, 11, struct nvgpu_as_map_buffer_batch_args)
+#define NVGPU_AS_IOCTL_GET_SYNC_RO_MAP  \
+        _IOR(NVGPU_AS_IOCTL_MAGIC,  12, struct nvgpu_as_get_sync_ro_map_args)
 
 #define NVGPU_AS_IOCTL_LAST            \
-        _IOC_NR(NVGPU_AS_IOCTL_MAP_BUFFER_BATCH)
+        _IOC_NR(NVGPU_AS_IOCTL_GET_SYNC_RO_MAP)
 #define NVGPU_AS_IOCTL_MAX_ARG_SIZE     \
         sizeof(struct nvgpu_as_map_buffer_ex_args)