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authorDonald Robson <donald.robson@imgtec.com>2023-11-22 19:34:23 +0300
committerMaxime Ripard <mripard@kernel.org>2023-11-23 11:01:45 +0300
commita191f73d85484f804284674c14f2d9f572c18adb (patch)
tree85ff47373fee7bd03c0b5e36f9fc38281563494b /include/drm/drm_gpuvm.h
parent66b73e9a402d822723b3af5263eb12d735628eac (diff)
downloadlinux-a191f73d85484f804284674c14f2d9f572c18adb.tar.xz
drm/gpuvm: Helper to get range of unmap from a remap op.
Determining the start and range of the unmap stage of a remap op is a common piece of code currently implemented by multiple drivers. Add a helper for this. Changes since v7: - Renamed helper to drm_gpuva_op_remap_to_unmap_range() - Improved documentation Changes since v6: - Remove use of __always_inline Signed-off-by: Donald Robson <donald.robson@imgtec.com> Signed-off-by: Sarah Walker <sarah.walker@imgtec.com> Reviewed-by: Danilo Krummrich <dakr@redhat.com> Link: https://lore.kernel.org/r/8a0a5b5eeec459d3c60fcdaa5a638ad14a18a59e.1700668843.git.donald.robson@imgtec.com Signed-off-by: Maxime Ripard <mripard@kernel.org>
Diffstat (limited to 'include/drm/drm_gpuvm.h')
-rw-r--r--include/drm/drm_gpuvm.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index 8ca10461d8ac..f94fec9a8517 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -1213,4 +1213,32 @@ void drm_gpuva_remap(struct drm_gpuva *prev,
void drm_gpuva_unmap(struct drm_gpuva_op_unmap *op);
+/**
+ * drm_gpuva_op_remap_to_unmap_range() - Helper to get the start and range of
+ * the unmap stage of a remap op.
+ * @op: Remap op.
+ * @start_addr: Output pointer for the start of the required unmap.
+ * @range: Output pointer for the length of the required unmap.
+ *
+ * The given start address and range will be set such that they represent the
+ * range of the address space that was previously covered by the mapping being
+ * re-mapped, but is now empty.
+ */
+static inline void
+drm_gpuva_op_remap_to_unmap_range(const struct drm_gpuva_op_remap *op,
+ u64 *start_addr, u64 *range)
+{
+ const u64 va_start = op->prev ?
+ op->prev->va.addr + op->prev->va.range :
+ op->unmap->va->va.addr;
+ const u64 va_end = op->next ?
+ op->next->va.addr :
+ op->unmap->va->va.addr + op->unmap->va->va.range;
+
+ if (start_addr)
+ *start_addr = va_start;
+ if (range)
+ *range = va_end - va_start;
+}
+
#endif /* __DRM_GPUVM_H__ */