linux-kernel - [RFC PATCH 3/7] drm/prime: Let drm_prime_pages_to_sg use the page

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Message-ID: <20250218232552.3450939-4-adrian.larumbe@collabora.com>
Date: Tue, 18 Feb 2025 23:25:33 +0000
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Rob Herring <robh@...nel.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: kernel@...labora.com,
	Adrián Larumbe <adrian.larumbe@...labora.com>
Subject: [RFC PATCH 3/7] drm/prime: Let drm_prime_pages_to_sg use the page_array interface

Switch to sg_alloc_table_from_page_array_segment() when generating an sgtable
from an array of pages. This is functionally equivalent, but a future commit
will also let us do the same from a memory page xarray.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
---
 drivers/gpu/drm/drm_prime.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 32a8781cfd67..1549733d3833 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -837,6 +837,7 @@ struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev,
 				       struct page **pages, unsigned int nr_pages)
 {
 	struct sg_table *sg;
+	struct page_array parray = PAGE_ARRAY(pages);
 	size_t max_segment = 0;
 	int err;
 
@@ -848,9 +849,9 @@ struct sg_table *drm_prime_pages_to_sg(struct drm_device *dev,
 		max_segment = dma_max_mapping_size(dev->dev);
 	if (max_segment == 0)
 		max_segment = UINT_MAX;
-	err = sg_alloc_table_from_pages_segment(sg, pages, nr_pages, 0,
-						(unsigned long)nr_pages << PAGE_SHIFT,
-						max_segment, GFP_KERNEL);
+	err = sg_alloc_table_from_page_array_segment(sg, parray, 0, nr_pages, 0,
+						     (unsigned long)nr_pages << PAGE_SHIFT,
+						     max_segment, GFP_KERNEL);
 	if (err) {
 		kfree(sg);
 		sg = ERR_PTR(err);
-- 
2.47.1