61 lines
2.1 KiB
Diff
61 lines
2.1 KiB
Diff
From a191f73d85484f804284674c14f2d9f572c18adb Mon Sep 17 00:00:00 2001
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From: Donald Robson <donald.robson@imgtec.com>
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Date: Wed, 22 Nov 2023 16:34:23 +0000
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Subject: [PATCH] drm/gpuvm: Helper to get range of unmap from a remap op.
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Determining the start and range of the unmap stage of a remap op is a
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common piece of code currently implemented by multiple drivers. Add a
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helper for this.
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Changes since v7:
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- Renamed helper to drm_gpuva_op_remap_to_unmap_range()
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- Improved documentation
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Changes since v6:
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- Remove use of __always_inline
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Signed-off-by: Donald Robson <donald.robson@imgtec.com>
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Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
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Reviewed-by: Danilo Krummrich <dakr@redhat.com>
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Link: https://lore.kernel.org/r/8a0a5b5eeec459d3c60fcdaa5a638ad14a18a59e.1700668843.git.donald.robson@imgtec.com
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Signed-off-by: Maxime Ripard <mripard@kernel.org>
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---
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include/drm/drm_gpuvm.h | 28 ++++++++++++++++++++++++++++
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1 file changed, 28 insertions(+)
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--- a/include/drm/drm_gpuvm.h
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+++ b/include/drm/drm_gpuvm.h
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@@ -1213,4 +1213,32 @@ void drm_gpuva_remap(struct drm_gpuva *p
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void drm_gpuva_unmap(struct drm_gpuva_op_unmap *op);
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+/**
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+ * drm_gpuva_op_remap_to_unmap_range() - Helper to get the start and range of
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+ * the unmap stage of a remap op.
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+ * @op: Remap op.
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+ * @start_addr: Output pointer for the start of the required unmap.
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+ * @range: Output pointer for the length of the required unmap.
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+ *
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+ * The given start address and range will be set such that they represent the
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+ * range of the address space that was previously covered by the mapping being
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+ * re-mapped, but is now empty.
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+ */
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+static inline void
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+drm_gpuva_op_remap_to_unmap_range(const struct drm_gpuva_op_remap *op,
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+ u64 *start_addr, u64 *range)
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+{
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+ const u64 va_start = op->prev ?
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+ op->prev->va.addr + op->prev->va.range :
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+ op->unmap->va->va.addr;
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+ const u64 va_end = op->next ?
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+ op->next->va.addr :
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+ op->unmap->va->va.addr + op->unmap->va->va.range;
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+
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+ if (start_addr)
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+ *start_addr = va_start;
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+ if (range)
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+ *range = va_end - va_start;
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+}
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+
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#endif /* __DRM_GPUVM_H__ */
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