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drm: tegra: Disable TEGRA_SYNCPT_INCR IOCTL for T264 platform

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Conditionally disabled the legacy TEGRA_SYNCPT_INCR IOCTL for T264
platforms since it's no longer needed. This IOCTL is superseded by the
newer TEGRA_SYNCPOINT_INCREMENT IOCTL which provides better functionality
and follows the modern API design.

The conditional compilation helps reduce the attack surface on T264
platforms by removing legacy code paths that aren't needed.

Use CONFIG_ARCH_TEGRA_264_SOC as the proper platform-specific flag
to identify T264 platforms, as this is the standard architecture flag
used throughout the codebase.

This change affects:
1. The IOCTL definition in the tegra_drm_ioctls table
2. The IOCTL handler function implementation

This improves code cleanliness by removing unnecessary legacy code
on newer platforms while maintaining backward compatibility for
older platforms that might depend on this IOCTL.

Bug 5060574

Change-Id: Idd21d69ebd992f976770016b5805f7d6af89c88d
Signed-off-by: Mainak Sen <msen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3342657
Reviewed-by: Sourab Gupta <sourabg@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Mainak Sen
2025-04-17 07:22:00 +00:00
committed by Jon Hunter
parent 4736728ec1
commit f0404e50f6
3 changed files with 10 additions and 0 deletions
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1
configs/Makefile.config.embedded-linux
View File

@@ -7,3 +7,4 @@ export NV_OOT_NVMAP_IN_EMBEDDED_LINUX=y
subdir-ccflags-y += -DNV_CONFIG_NVMAP_IN_EMBEDDED_LINUX
export NV_OOT_NVHOST_NATIVE_DIS=y
export NV_OOT_NVHOST_DISABLE_LEGACY_IOCTL=y

5
drivers/gpu/Makefile
View File

@@ -20,6 +20,11 @@ export CONFIG_TEGRA_DRM_NATIVE_DIS=y
subdir-ccflags-y += -DCONFIG_TEGRA_DRM_NATIVE_DIS
endif
ifeq ($(NV_OOT_NVHOST_DISABLE_LEGACY_IOCTL),y)
export CONFIG_TEGRA_DRM_DISABLE_LEGACY_IOCTL=y
subdir-ccflags-y += -DCONFIG_TEGRA_DRM_DISABLE_LEGACY_IOCTL
endif
ifdef CONFIG_DRM
obj-m += drm/tegra/
endif

4
drivers/gpu/drm/tegra/drm.c
View File

@@ -412,6 +412,10 @@ static int tegra_syncpt_incr(struct drm_device *drm, void *data,
struct drm_tegra_syncpt_incr *args = data;
struct host1x_syncpt *sp;
/* Legacy IOCTL is not supported on tegra264 */
if (of_machine_is_compatible("nvidia,tegra264"))
return -EINVAL;
sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
if (!sp)
return -EINVAL;