[igt-dev] [PATCH i-g-t 01/35] lib/gem_submission: Add gem_has_relocations() check
From: Zbigniew Kempczyński <hidden>
Date: 2021-02-16 11:40:23
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Add check which probes kernel supports relocation or not for i915 device. Signed-off-by: Zbigniew Kempczyński <redacted> Signed-off-by: Chris Wilson <redacted> Cc: Dominik Grzegorzek <redacted> Cc: Petri Latvala <redacted> --- lib/i915/gem_submission.c | 30 ++++++++++++++++++++++++++++++ lib/i915/gem_submission.h | 1 + 2 files changed, 31 insertions(+)
diff --git a/lib/i915/gem_submission.c b/lib/i915/gem_submission.c
index 320340a5d..051f9d046 100644
--- a/lib/i915/gem_submission.c
+++ b/lib/i915/gem_submission.c@@ -398,3 +398,33 @@ unsigned int gem_submission_measure(int i915, unsigned int engine) return size; } + +/** + * gem_has_relocations: + * @fd: opened i915 drm file descriptor + * + * Feature test macro to query whether kernel allows for generation to + * use relocations. + * + * Returns: true if we can use relocations, otherwise false + */ + +bool gem_has_relocations(int i915) +{ + struct drm_i915_gem_relocation_entry reloc = {}; + struct drm_i915_gem_exec_object2 obj = { + .handle = gem_create(i915, 4096), + .relocs_ptr = to_user_pointer(&reloc), + .relocation_count = 1, + }; + struct drm_i915_gem_execbuffer2 execbuf = { + .buffers_ptr = to_user_pointer(&obj), + .buffer_count = 1, + }; + bool has_relocs; + + has_relocs = __gem_execbuf(i915, &execbuf) == -ENOENT; + gem_close(i915, obj.handle); + + return has_relocs; +}
diff --git a/lib/i915/gem_submission.h b/lib/i915/gem_submission.h
index 773e7b516..0faba6a3e 100644
--- a/lib/i915/gem_submission.h
+++ b/lib/i915/gem_submission.h@@ -49,5 +49,6 @@ void gem_require_blitter(int i915); unsigned int gem_submission_measure(int i915, unsigned int engine); void gem_test_engine(int fd, unsigned int engine); +bool gem_has_relocations(int fd); #endif /* GEM_SUBMISSION_H */
--
2.26.0
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