[Intel-gfx] [PATCH 1/2] lib/drmtest: add drmtest_disable/enable_prefault() function
Daniel Vetter
daniel at ffwll.ch
Fri Jul 19 18:14:27 CEST 2013
On Fri, Jul 19, 2013 at 06:42:51PM +0800, Xiong Zhang wrote:
> V2: add exit handler to enable prefault (Daniel)
>
> Signed-off-by: Xiong Zhang <xiong.y.zhang at intel.com>
Thanks a lot for doing these patches, I've merged them both. Just to
check: Are the subtests added now instead of your gem_prefault testcase
good enough to still hit all slowpaths? I have to admit that I didn't even
really compile-test my little idea that I've pasted as a diff into my
reply ;-)
Cheers, Daniel
> ---
> lib/drmtest.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
> lib/drmtest.h | 3 +++
> 2 files changed, 53 insertions(+)
>
> diff --git a/lib/drmtest.c b/lib/drmtest.c
> index 011d8c1..980fa49 100644
> --- a/lib/drmtest.c
> +++ b/lib/drmtest.c
> @@ -1593,3 +1593,53 @@ void kmstest_free_connector_config(struct kmstest_connector_config *config)
> drmModeFreeEncoder(config->encoder);
> drmModeFreeConnector(config->connector);
> }
> +
> +#define PREFAULT_DEBUGFS "/sys/module/i915/parameters/prefault_disable"
> +static int drmtest_prefault_control(bool enable)
> +{
> + char *name = PREFAULT_DEBUGFS;
> + int fd;
> + char buf[2] = {'Y', 'N'};
> + int index;
> + int result = 0;
> +
> + fd = open(name, O_RDWR);
> + if (fd == -1) {
> + fprintf(stderr, "Couldn't open prefault_debugfs.%s\n",
> + strerror(errno));
> + return -1;
> + }
> +
> + if (enable)
> + index = 1;
> + else
> + index = 0;
> +
> + if (write(fd, &buf[index], 1) != 1) {
> + fprintf(stderr, "write prefault_debugfs error.%s\n",
> + strerror(errno));
> + result = -1;
> + }
> +
> + close(fd);
> +
> + return result;
> +}
> +
> +static void enable_prefault_at_exit(int sig)
> +{
> + drmtest_enable_prefault();
> +}
> +
> +int drmtest_disable_prefault(void)
> +{
> + drmtest_install_exit_handler(enable_prefault_at_exit);
> +
> + return drmtest_prefault_control(false);
> +}
> +
> +int drmtest_enable_prefault(void)
> +{
> + return drmtest_prefault_control(true);
> +}
> +
> diff --git a/lib/drmtest.h b/lib/drmtest.h
> index e3a9275..80b344c 100644
> --- a/lib/drmtest.h
> +++ b/lib/drmtest.h
> @@ -179,3 +179,6 @@ void drmtest_enable_exit_handler(void);
> void drmtest_disable_exit_handler(void);
>
> int drmtest_set_vt_graphics_mode(void);
> +
> +int drmtest_disable_prefault(void);
> +int drmtest_enable_prefault(void);
> --
> 1.8.3.2
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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