linux-kernel - [PATCH v8 02/20] drm/gpuvm: Helper to get range of unmap from a remap op.

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Message-Id: <20231031151257.90350-3-sarah.walker@imgtec.com>
Date:   Tue, 31 Oct 2023 15:12:39 +0000
From:   Sarah Walker <sarah.walker@...tec.com>
To:     <dri-devel@...ts.freedesktop.org>
CC:     <frank.binns@...tec.com>, <donald.robson@...tec.com>,
        <boris.brezillon@...labora.com>, <faith.ekstrand@...labora.com>,
        <airlied@...il.com>, <daniel@...ll.ch>,
        <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <afd@...com>, <hns@...delico.com>,
        <matthew.brost@...el.com>, <christian.koenig@....com>,
        <luben.tuikov@....com>, <dakr@...hat.com>,
        <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <corbet@....net>,
        <linux-doc@...r.kernel.org>
Subject: [PATCH v8 02/20] drm/gpuvm: Helper to get range of unmap from a remap op.

From: Donald Robson <donald.robson@...tec.com>

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@...tec.com>
Signed-off-by: Sarah Walker <sarah.walker@...tec.com>
---
 include/drm/drm_gpuvm.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index c7ed6bf441d4..c64585dc4e8e 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -702,4 +702,32 @@ 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__ */
-- 
2.42.0