[igt-dev] [PATCH i-g-t v17 25/31] lib/ioctl_wrappers: Add gem_has_relocations() check
From: Zbigniew Kempczyński <hidden>
Date: 2021-01-15 12:58:33
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/ioctl_wrappers.c | 30 ++++++++++++++++++++++++++++++ lib/ioctl_wrappers.h | 1 + 2 files changed, 31 insertions(+)
diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 45415621b..27c3cb2ee 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c@@ -868,6 +868,36 @@ uint64_t gem_total_stolen_size(int fd) return aperture.stolen_total_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; +} + /** * gem_has_softpin: * @fd: open i915 drm file descriptor
diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index 69e198419..bccc2ac4d 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h@@ -116,6 +116,7 @@ int gem_gpu_reset_type(int fd); bool gem_gpu_reset_enabled(int fd); bool gem_engine_reset_enabled(int fd); uint64_t gem_total_stolen_size(int fd); +bool gem_has_relocations(int fd); bool gem_has_softpin(int fd); bool gem_has_exec_fence(int fd);
--
2.26.0
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