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lib: extract igt_open_forcewake_handle

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... and I immediately regret that I've killed the return value
for igt_debugfs_init, since we have callers which need to work
without the forcewake stuff, e.g. the reg dumper needs to work
without i915 loaded.

Put this new helper to good use in the mmio code and the pm_pc8
testcase.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter
2014-03-14 16:00:22 +01:00
parent 553d594b6e
commit ea18fc16cd
4 changed files with 45 additions and 58 deletions
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lib/igt_debugfs.c
+36 -9
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@@ -76,13 +76,7 @@
* General debugfs helpers
*/
/**
* igt_debugfs_init:
* @debugfs: debugfs access structure to initialize
*
* Initializes the debugfs access helper library.
*/
void igt_debugfs_init(igt_debugfs_t *debugfs)
static bool __igt_debugfs_init(igt_debugfs_t *debugfs)
{
const char *path = "/sys/kernel/debug";
struct stat st;
@@ -107,13 +101,24 @@ find_minor:
sprintf(debugfs->dri_path + len, "/i915_error_state");
if (stat(debugfs->dri_path, &st) == 0) {
debugfs->dri_path[len] = '\0';
return;
return true;
}
}
debugfs->dri_path[0] = '\0';
igt_fail(4);
return false;
}
/**
* igt_debugfs_init:
* @debugfs: debugfs access structure to initialize
*
* Initializes the debugfs access helper library.
*/
void igt_debugfs_init(igt_debugfs_t *debugfs)
{
igt_assert(__igt_debugfs_init(debugfs));
}
/**
@@ -578,3 +583,25 @@ void igt_enable_prefault(void)
{
igt_prefault_control(true);
}
/**
* igt_open_forcewake_handle:
*
* This functions opens the debugfs forcewake file and so prevents the GT from
* suspending. The reference is automatically dropped when the is closed.
*
* Returns: The file descriptor of the forcewake handle or -1 if that didn't
* work out.
*/
int igt_open_forcewake_handle(void)
{
igt_debugfs_t debugfs;
int fd;
if (!__igt_debugfs_init(&debugfs))
return -1;
fd = igt_debugfs_open(&debugfs, "i915_forcewake_user", O_WRONLY);
return fd;
}