linux-kernel - [PATCH v16] drm/etnaviv: Fix page property being used for non writecombine buffers

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Message-Id: <20241104004156.8635-1-sui.jingfeng@linux.dev>
Date: Mon,  4 Nov 2024 08:41:56 +0800
From: Sui Jingfeng <sui.jingfeng@...ux.dev>
To: Lucas Stach <l.stach@...gutronix.de>,
	Russell King <linux+etnaviv@...linux.org.uk>,
	Christian Gmeiner <christian.gmeiner@...il.com>
Cc: David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	etnaviv@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: [PATCH v16] drm/etnaviv: Fix page property being used for non writecombine buffers

In the etnaviv_gem_vmap_impl() function, the driver vmap whatever buffers
with write combine(WC) page property, this is incorrect. Cached buffers
should be mapped with the cached page property and uncached buffers should
be mapped with the uncached page property.

Fixes: a0a5ab3e99b8 ("drm/etnaviv: call correct function when trying to vmap a DMABUF")
Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
---
Split from my PCIe device driver wrapper support series, since this probably
should be resend as a standalone patch.

v15: Use `obj->flags & ETNA_BO_CACHE_MASK` (Lucas)
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index d51843d9a476..d2cb9dded051 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -362,6 +362,7 @@ static void etnaviv_gem_object_vunmap(struct drm_gem_object *obj,
 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 {
 	struct page **pages;
+	pgprot_t prot;
 
 	lockdep_assert_held(&obj->lock);
 
@@ -369,8 +370,19 @@ static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 	if (IS_ERR(pages))
 		return NULL;
 
-	return vmap(pages, obj->base.size >> PAGE_SHIFT,
-			VM_MAP, pgprot_writecombine(PAGE_KERNEL));
+	switch (obj->flags & ETNA_BO_CACHE_MASK) {
+	case ETNA_BO_CACHED:
+		prot = PAGE_KERNEL;
+		break;
+	case ETNA_BO_UNCACHED:
+		prot = pgprot_noncached(PAGE_KERNEL);
+		break;
+	case ETNA_BO_WC:
+	default:
+		prot = pgprot_writecombine(PAGE_KERNEL);
+	}
+
+	return vmap(pages, obj->base.size >> PAGE_SHIFT, VM_MAP, prot);
 }
 
 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
-- 
2.34.1