[Mesa-dev] how to run gallium/tests/trivial/compute.c on r600
Liu Xin
navy.xliu at gmail.com
Fri Oct 5 07:24:00 PDT 2012
Hi, Tom,
thanks for your kind guidance. within a daunting day, we have made clover
work on our APU platform. for your information, we are running on ubuntu
12-04, i386.
out of curiosity, r600 driver relies on the newest llvm API, see llvm 3.2.
is it stable? we know LLVM is a fast moving project and their APIs are
subject to change year by year. I assume you are working tightly to llvm
3.2 because AMD backend will merge to trunk, right? we ask this question
because android-x86 can not support up-to-date llvm. it only has llvm 2.8
now. we may port a certain version of llvm to satisfy with android and
mesa.
thanks,
--lx
On Thu, Oct 4, 2012 at 11:04 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Thu, Oct 4, 2012 at 10:53 AM, Tom Stellard <tom at stellard.net> wrote:
> > On Thu, Oct 04, 2012 at 10:42:45PM +0800, Liu Xin wrote:
> >> Hi, Tom,
> >>
> >> thank you for your instant response. we decide to try clover for r600.
> it
> >> should work on ubuntu(11.10), right?
> >> have you refined tgsi compiler for r600?
> >>
> >
> > Build instructions for clover + r600g are here:
> > http://dri.freedesktop.org/wiki/GalliumCompute#How_to_Install
> > these should work on most any distro.
> >
> > We are in the process of transitioning from LLVM 3.2 to LLVM 3.1, so
> > these instructions may change in the near future.
>
> 3.1 to 3.2 ;)
>
> >
> > There are no plans to update the r600g tgsi compiler to handle TGSI
> > compute instructions. LLVM IR is the preferred IR for compute programs,
> > and it is well supported.
> >
> > -Tom
> >
> >
> >> thanks,
> >> --lx
> >>
> >>
> >>
> >>
> >>
> >> On Thu, Oct 4, 2012 at 9:42 PM, Tom Stellard <tom at stellard.net> wrote:
> >>
> >> > On Wed, Oct 03, 2012 at 08:15:07PM +0800, Liu Xin wrote:
> >> > > Hi, Gallium Hackers,
> >> > >
> >> > > We are working on Gallium3D on android-x86, APU. We want to run
> general
> >> > > compute programs on r600 GPU, specifically, "Radeon HD6310(Evergreen
> >> > > family)".
> >> > >
> >> > > The first thing drawn our eyes are gallium/tests/trivial/compute.c
> >> > because
> >> > > it calls general compute APIs and attempts to execute tgsi programs
> on a
> >> > > back-end. unfortunately, we failed to execute it even we have
> >> > pipe_r600.so
> >> > > on android-x86. now we have a healthy android-x86 and it supports
> opengl
> >> > > well. further, we can run tri.c under tests/trivial/ directory as
> well.
> >> > >
> >> >
> >> > The gallium/tests/trivial/compute.c program won't work on r600g,
> because
> >> > the driver only supports compute programs written in LLVM IR and not
> >> > TGSI.
> >> >
> >> > There are some example OpenCL programs here:
> >> > http://cgit.freedesktop.org/~tstellar/opencl-example/
> >> > that work with r600g. Make sure you build Mesa with the
> --enable-opencl
> >> > configure flag.
> >> >
> >> > If you don't want to use OpenCL and just want to play with the Gallium
> >> > compute interface, you can replace the TGSI program with LLVM IR.
> >> > You can use the LLVM C API builder interface to create a program (see:
> >> > http://llvm.org/docs/doxygen/html/Core_8h.html) or you can write the
> >> > LLVM IR by hand and then parse it into LLVM bitcode (I think there
> are C
> >> > API functions that will do this too).
> >> >
> >> >
> >> > Hope this helps.
> >> >
> >> > -Tom
> >> > > let's take a simple example. can a kind person give us pointers?
> >> > > static void test_resource_access(struct context *ctx)
> >> > > {
> >> > > const char *src = "COMP\n"
> >> > > "DCL RES[0], BUFFER, RAW, WR\n"
> >> > > "DCL RES[1], 2D, RAW, WR\n"
> >> > > "DCL SV[0], BLOCK_ID[0]\n"
> >> > > "DCL TEMP[0], LOCAL\n"
> >> > > "DCL TEMP[1], LOCAL\n"
> >> > > "IMM UINT32 { 15, 0, 0, 0 }\n"
> >> > > "IMM UINT32 { 16, 1, 0, 0 }\n"
> >> > > "\n"
> >> > > " BGNSUB\n"
> >> > > " UADD TEMP[0].x, SV[0].xxxx, SV[0].yyyy\n"
> >> > > " AND TEMP[0].x, TEMP[0], IMM[0]\n"
> >> > > " UMUL TEMP[0].x, TEMP[0], IMM[1]\n"
> >> > > " LOAD TEMP[0].xyzw, RES[0], TEMP[0]\n"
> >> > > " UMUL TEMP[1], SV[0], IMM[1]\n"
> >> > > " STORE RES[1].xyzw, TEMP[1], TEMP[0]\n"
> >> > > " RET\n"
> >> > > " ENDSUB\n";
> >> > > void init0(void *p, int s, int x, int y) {
> >> > > *(float *)p = 8.0 - (float)x;
> >> > > }
> >> > > void init1(void *p, int s, int x, int y) {
> >> > > *(uint32_t *)p = 0xdeadbeef;
> >> > > }
> >> > > void expect(void *p, int s, int x, int y) {
> >> > > *(float *)p = 8.0 - (float)((x + 4*y) & 0x3f);
> >> > > }
> >> > >
> >> > > printf("- %s\n", __func__);
> >> > >
> >> > > init_prog(ctx, 0, 0, 0, src, NULL);
> >> > > init_tex(ctx, 0, PIPE_BUFFER, true, PIPE_FORMAT_R32_FLOAT,
> >> > > 256, 0, init0);
> >> > > init_tex(ctx, 1, PIPE_TEXTURE_2D, true,
> PIPE_FORMAT_R32_FLOAT,
> >> > > 60, 12, init1);
> >> > > init_compute_resources(ctx, (int []) { 0, 1, -1 });
> >> > > launch_grid(ctx, (uint []){1, 1, 1}, (uint []){15, 12, 1},
> 0,
> >> > NULL);
> >> > > check_tex(ctx, 1, expect, NULL);
> >> > > destroy_compute_resources(ctx);
> >> > > destroy_tex(ctx);
> >> > > destroy_prog(ctx);
> >> > > }
> >> > >
> >> > > for init_prog, here is the key functions:
> >> > > *tgsi_text_translate(psrc, prog, Elements(prog));
> >> > > what's the meaning for this API? the input is tgsi program, what's
> the
> >> > > output?
> >> > > in a nutshell, how can gallium translate tgsi to evergreen's ISA.
> >> > >
> >> > > *ctx->hwcs = pipe->create_compute_state(pipe, &cs);
> >> > > *pipe->bind_compute_state(pipe, ctx->hwcs);
> >> > > in evergreen_compute.c, it doesn't calloc kernels array and process
> >> > > cso->prog if HAVE_OPENCL is not set. should we set HAVE_OPENCL for
> >> > general
> >> > > compute?
> >> > >
> >> > > thanks,
> >> > > --lx
> >> >
> >> > > _______________________________________________
> >> > > mesa-dev mailing list
> >> > > mesa-dev at lists.freedesktop.org
> >> > > http://lists.freedesktop.org/mailman/listinfo/mesa-dev
> >> >
> >> >
> > _______________________________________________
> > mesa-dev mailing list
> > mesa-dev at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/mesa-dev
>
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