gpu: nvgpu: Remove the use of READ_ONLY for DMA API

READ_ONLY flag for dma API is a Tegra specific API. We use it only
to prevent accidental writes to non-secure ACR bootloader. Its use is
marginal, so remove the flag.

JIRA NVGPU-4

Change-Id: I887dc04aee8f7ace40220294851b210375dfde98
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1648174
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 2 insertions, 6 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/dma.c b/drivers/gpu/nvgpu/common/linux/dma.c
index fe4e9bc8..c13dae8b 100644
--- a/drivers/gpu/nvgpu/common/linux/dma.c
+++ b/drivers/gpu/nvgpu/common/linux/dma.c
@@ -50,7 +50,7 @@
  * added it must be added here as well!!
  */
 #define NVGPU_DMA_STR_SIZE                                      \
-        sizeof("NO_KERNEL_MAPPING FORCE_CONTIGUOUS READ_ONLY")
+        sizeof("NO_KERNEL_MAPPING FORCE_CONTIGUOUS")
 
 /*
  * The returned string is kmalloc()ed here but must be freed by the caller.
@@ -77,7 +77,6 @@ static char *nvgpu_dma_flags_to_str(struct gk20a *g, unsigned long flags)
 
         APPEND_FLAG(NVGPU_DMA_NO_KERNEL_MAPPING, "NO_KERNEL_MAPPING ");
         APPEND_FLAG(NVGPU_DMA_FORCE_CONTIGUOUS,  "FORCE_CONTIGUOUS ");
-        APPEND_FLAG(NVGPU_DMA_READ_ONLY,         "READ_ONLY");
 #undef APPEND_FLAG
 
         return buf;
@@ -171,8 +170,6 @@ static void nvgpu_dma_flags_to_attrs(struct dma_attrs *attrs,
                 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, ATTR_ARG(attrs));
         if (flags & NVGPU_DMA_FORCE_CONTIGUOUS)
                 dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, ATTR_ARG(attrs));
-        if (flags & NVGPU_DMA_READ_ONLY)
-                dma_set_attr(DMA_ATTR_READ_ONLY, ATTR_ARG(attrs));
 #undef ATTR_ARG
 }
 
diff --git a/drivers/gpu/nvgpu/gm20b/acr_gm20b.c b/drivers/gpu/nvgpu/gm20b/acr_gm20b.c
index c57fba45..cffe7199 100644
--- a/drivers/gpu/nvgpu/gm20b/acr_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/acr_gm20b.c
@@ -1348,8 +1348,7 @@ int pmu_exec_gen_bl(struct gk20a *g, void *desc, u8 b_wait_for_halt)
                 /*TODO in code verify that enable PMU is done,
                         scrubbing etc is done*/
                 /*TODO in code verify that gmmu vm init is done*/
-                err = nvgpu_dma_alloc_flags_sys(g,
-                                NVGPU_DMA_READ_ONLY, bl_sz, &acr->hsbl_ucode);
+                err = nvgpu_dma_alloc_sys(g, bl_sz, &acr->hsbl_ucode);
                 if (err) {
                         nvgpu_err(g, "failed to allocate memory");
                         goto err_done;