[PATCH v2] drm/tegra: Add tegra_gem_mmap2 to fix 64-bit offsets

[Thierry Reding]

On Thu, Jan 29, 2015 at 02:18:41PM -0500, Sean Paul wrote:
> On 64-bit targets, tegra_gem_mmap doesn't return the
> offset to userspace. As such, subsequent calls to mmap(2)
> fail. Add a new tegra_gem_mmap2 ioctl to fix this.
> 
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---
>  drivers/gpu/drm/tegra/drm.c  | 21 +++++++++++++++++++++
>  include/uapi/drm/tegra_drm.h |  9 +++++++++
>  2 files changed, 30 insertions(+)

To be honest, I'd rather just fix the existing IOCTL to do the right
thing on 64-bit. All IOCTLs are still protected by the DRM_TEGRA_STAGING
Kconfig symbol which depends on STAGING. We originally did that
precisely so we'd have some leeway in fixing things up. And we've done
precisely that in the past.

The only user of this IOCTL is libdrm and I don't think that has any
users aside from a few projects that are still under heavy development
(like grate or the xf86-video-opentegra driver).

Cc'ing Erik, who's probably the only one that's ever worked with this,
besides me.

Thierry
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