On Tue, Dec 14, 2010 at 12:11 AM, Jerome Glisse <j.gli...@gmail.com> wrote:
> On Mon, Dec 13, 2010 at 10:18 AM, Arnd Bergmann <a...@arndb.de> wrote: > > On Monday 13 December 2010, Jammy Zhou wrote: > >> On Mon, Dec 13, 2010 at 4:45 AM, Linus Walleij < > linus.wall...@linaro.org>wrote: > >> > >> > On 11 December 2010 22:41, Arnd Bergmann <a...@arndb.de> wrote: > >> > > >> > * amd-gpu -- a single but huge driver for the GPU. As is normally the > >> >> case with GPU drivers, we can expect long discussions > >> >> before it will get considered for mainline > >> >> 4 patches > >> >> 98 files changed, 278321 insertions(+), 0 deletions(-) > >> >> > >> > > >> > Just out of curiosity, following the discussion between Dave Airlie > >> > and Codeaurora this summer re GPU driver shims. > >> > > >> > Is the AMD GPU exposing all functionality in its kernel driver or > >> > is there some userspace blob somewhere with lots of e.g. GL > >> > goodies? > >> > > >> All the functionality for the kernel driver of AMD GPU Z430/Z160 (now > >> belongs to Qualcom) is exposed. But we need accompanied userspace > library to > >> call these functionality (buffer management, command submission, ...). > > > > Who owns these components? If it's closed source, the only options we > > have are lobbying for complete release of the specs for a > reimplementation > > or reverse-engineering the drivers, which may at least get easier with > > a user space driver than it would be with a kernel driver. > > > > Until there is a solution with an open source user space part, I would > > suggest that the driver better be dropped from the Freescale BSP and > > we should at least not waste time reviewing it. > > > > Arnd > > From a quick look it also seems that the API exposed to userspace > would allow easy abuse of the GPU to access any system ram. There is a > reason we do expensive command checking in the other amd gpu driver > (drivers/gpu/drm/radeon/*cs.c files) > No, the memory used by the GPU is reserved at boot time, so I think there is no such a problem. > > Cheers, > Jerome >
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