Re: [PATCH] intel_get_llc_size: Small tool to query LLC size

Daniel Vetter
2013-07-10T06:34:17Z

On Tue, Jul 09, 2013 at 07:58:03PM -0700, Ben Widawsky wrote:
> CC: Chad Versace <chad.versace@linux.intel.com>
> CC: Bryan Bell <bryan.j.bell@intel.com>
> Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

So I think we should run this from igt and check its return value. And
since we've had a few bugs with other (currently untested) igt tools, can
you please add a new igt_tools testcase which just runs those? I'm
thinking of intel_reg_dumper and intel_reg_read (with some render ring
register that exists everywhere) on top of running intel_get_llc_size
here.

And please also add eLLC size querying.
-Daniel

> ---
> tools/Makefile.am | 1 +
> tools/intel_get_llc_size.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 58 insertions(+)
> create mode 100644 tools/intel_get_llc_size.c
>
> diff --git a/tools/Makefile.am b/tools/Makefile.am
> index 2519169..a064b65 100644
> --- a/tools/Makefile.am
> +++ b/tools/Makefile.am
> @@ -9,6 +9,7 @@ bin_PROGRAMS = \
> intel_bios_dumper \
> intel_bios_reader \
> intel_error_decode \
> + intel_get_llc_size \
> intel_gpu_top \
> intel_gpu_time \
> intel_gtt \
> diff --git a/tools/intel_get_llc_size.c b/tools/intel_get_llc_size.c
> new file mode 100644
> index 0000000..bd384d2
> --- /dev/null
> +++ b/tools/intel_get_llc_size.c
> @@ -0,0 +1,57 @@
> +/*
> + * Copyright © 2013 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + */
> +
> +#include <sys/ioctl.h>
> +#include "drmtest.h"
> +#include "i915_drm.h"
> +
> +static int get_llc_size(int fd)
> +{
> + struct drm_i915_getparam gp;
> + int size;
> +
> + gp.param = I915_PARAM_HAS_LLC;
> + gp.value = &size;
> +
> + if (ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp, sizeof(gp)))
> + return 0;
> +
> + return size;
> +}
> +
> +int main(int argc, char **argv)
> +{
> + int size, fd = drm_open_any();
> +
> + size = get_llc_size(fd);
> +
> + if (size == 0)
> + fprintf(stdout, "Doesn't have LLC\n");
> + else if (size == 1)
> + fprintf(stdout, "Kernel is too old to determine LLC size\n");
> + else
> + fprintf(stdout, "LLC size = %dK\n", size>>10);
> +
> + return 0;
> +}
> --
> 1.8.3.2
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch