gpu: nvgpu: add usermode submission interface HAL

The patch adds the HAL interfaces for handling the usermode
submission, particularly allocating channel specific usermode
userd. These interfaces are currently implemented only on QNX,
and are created accordingly. As and when linux adds the
usermode submission support, we can revisit them
if any further changes are needed.

Change-Id: I790e0ebdfaedcdc5f6bb624652b1af4549b7b062
Signed-off-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1683392
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 39 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 83c49d52..a68968fe 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -376,6 +376,13 @@ static void gk20a_free_channel(struct channel_gk20a *ch, bool force)
         if(g->ops.fifo.free_channel_ctx_header)
                 g->ops.fifo.free_channel_ctx_header(ch);
 
+        if (ch->usermode_submit_enabled) {
+                gk20a_channel_free_usermode_buffers(ch);
+                ch->userd_iova = nvgpu_mem_get_addr(g, &f->userd) +
+                                ch->chid * f->userd_entry_size;
+                ch->usermode_submit_enabled = false;
+        }
+
         gk20a_gr_flush_channel_tlb(gr);
 
         nvgpu_dma_unmap_free(ch_vm, &ch->gpfifo.mem);
@@ -1086,12 +1093,30 @@ int gk20a_channel_alloc_gpfifo(struct channel_gk20a *c,
                 goto clean_up_idle;
         }
 
+        if (gpfifo_args->flags & NVGPU_GPFIFO_FLAGS_USERMODE_SUPPORT) {
+                if (g->ops.fifo.alloc_usermode_buffers) {
+                        err = g->ops.fifo.alloc_usermode_buffers(c,
+                                        gpfifo_args);
+                        if (err) {
+                                nvgpu_err(g, "Usermode buffer alloc failed");
+                                goto clean_up;
+                        }
+                        c->userd_iova = nvgpu_mem_get_addr(g,
+                                &c->usermode_userd);
+                        c->usermode_submit_enabled = true;
+                } else {
+                        nvgpu_err(g, "Usermode submit not supported");
+                        err = -EINVAL;
+                        goto clean_up;
+                }
+        }
+
         err = nvgpu_dma_alloc_map_sys(ch_vm,
                         gpfifo_size * gpfifo_entry_size,
                         &c->gpfifo.mem);
         if (err) {
                 nvgpu_err(g, "%s: memory allocation failed", __func__);
-                goto clean_up;
+                goto clean_up_usermode;
         }
 
         if (c->gpfifo.mem.aperture == APERTURE_VIDMEM || g->mm.force_pramin) {
@@ -1174,6 +1199,13 @@ clean_up_sync:
 clean_up_unmap:
         nvgpu_big_free(g, c->gpfifo.pipe);
         nvgpu_dma_unmap_free(ch_vm, &c->gpfifo.mem);
+clean_up_usermode:
+        if (c->usermode_submit_enabled) {
+                gk20a_channel_free_usermode_buffers(c);
+                c->userd_iova = nvgpu_mem_get_addr(g, &g->fifo.userd) +
+                                c->chid * g->fifo.userd_entry_size;
+                c->usermode_submit_enabled = false;
+        }
 clean_up:
         memset(&c->gpfifo, 0, sizeof(struct gpfifo_desc));
 clean_up_idle:
@@ -1187,6 +1219,12 @@ clean_up_idle:
         return err;
 }
 
+void gk20a_channel_free_usermode_buffers(struct channel_gk20a *c)
+{
+        if (nvgpu_mem_is_valid(&c->usermode_userd))
+                nvgpu_dma_free(c->g, &c->usermode_userd);
+}
+
 /* Update with this periodically to determine how the gpfifo is draining. */
 static inline u32 update_gp_get(struct gk20a *g,
                                 struct channel_gk20a *c)