gpu: nvgpu: allow bind to be interrupted

This change solves two problems:

(*) the possibility of a crash due to interrupting the gpu
initialization following a bind
(*) a IOVA memory leak that could prevent the GPU from binding after
about 200 bind/unbind cycles

A detailed list of fixes:

- chek that arbiter is initialized before freeing it.
- do not re-enable interrupts when MSI is enabled on unbind.
- free the semaphore sea on unbind.
- ensure we dont double load the vbios.
- check return value of nvgpu_mutex_init for semaphores.
- add corresponding nvgpu_mutex_destroy calls.

bug 1816516

Change-Id: Ia8af73019e0e1183998855d55bb3eea09672a8b7
Signed-off-by: David Nieto <dmartineznie@nvidia.com>
Reviewed-on: http://git-master/r/1465302
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-by: David Jarrett <djarrett@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1563019
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index 13c62691..0cd77d1e 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -1233,6 +1233,7 @@ struct gk20a {
 #ifdef CONFIG_DEBUG_FS
         struct debugfs_blob_wrapper bios_blob;
 #endif
+        bool bios_is_init;
 
         struct nvgpu_clk_arb *clk_arb;
 
diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index 0e0326dd..dd8b900d 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -393,7 +393,7 @@ static void gk20a_remove_mm_support(struct mm_gk20a *mm)
         nvgpu_vm_put(mm->pmu.vm);
         nvgpu_vm_put(mm->cde.vm);
 
-        gk20a_semaphore_sea_destroy(g);
+        nvgpu_semaphore_sea_destroy(g);
         gk20a_vidmem_destroy(g);
         nvgpu_pd_cache_fini(g);
 }