From 98da3f8eed914225e9ffe0f768d7647506e95cdc Mon Sep 17 00:00:00 2001 From: Alex Waterman Date: Mon, 29 Jan 2018 16:21:30 -0800 Subject: gpu: nvgpu: Cleanup usage of bypass_smmu The GPU has multiple different operating modes in respect to IOMMU'ability. As such there needs to be a clean way to tell the driver whether it is IOMMU'able or not. This state also does not always reflect what is possible: all becasue the GPU can generate IOMMU'ed memory requests doesn't mean it wants to. The nvgpu_iommuable() API has now existed for a little while which is a useful way to convey whether nvgpu should consider the GPU as IOMMU'able. However, there is also the g->mm.bypass_smmu flag which used to be able to override what the GPU decided it should do. Typically it was assigned the same value as nvgpu_iommuable() but that was not necessarily a requirment. This patch removes all the usages of g->mm.bypass_smmu and instead uses the nvgpu_iommuable() function. All places where the check against g->mm.bypass_smmu have been replaced with nvgpu_iommuable(). The code should now be much cleaner. Subsequently other checks can also be placed in the nvgpu_iommuable() function. For example, when NVLINK comes online and the GPU should no longer consider DMA addresses and instead use scatter-gather lists directly the ngpu_iommuable() function will be able to check the state of NVLINK and then act accordingly. Change-Id: I0da6262386de15709decac89d63d3eecfec20cd7 Signed-off-by: Alex Waterman Reviewed-on: https://git-master.nvidia.com/r/1648332 Reviewed-by: mobile promotions Tested-by: mobile promotions --- drivers/gpu/nvgpu/common/linux/platform_gv11b_tegra.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/gpu/nvgpu/common/linux/platform_gv11b_tegra.c') diff --git a/drivers/gpu/nvgpu/common/linux/platform_gv11b_tegra.c b/drivers/gpu/nvgpu/common/linux/platform_gv11b_tegra.c index c56bc0f3..7d7fc603 100644 --- a/drivers/gpu/nvgpu/common/linux/platform_gv11b_tegra.c +++ b/drivers/gpu/nvgpu/common/linux/platform_gv11b_tegra.c @@ -81,8 +81,7 @@ static int gv11b_tegra_probe(struct device *dev) g->has_syncpoints = false; #endif - platform->bypass_smmu = !device_is_iommuable(dev); - platform->disable_bigpage = platform->bypass_smmu; + platform->disable_bigpage = !device_is_iommuable(dev); platform->g->gr.ctx_vars.dump_ctxsw_stats_on_channel_close = false; -- cgit v1.2.2