From: Yangyu Chen <cyy@cyyself.name>
To: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Cc: Christian Koenig <christian.koenig@amd.com>,
Huang Rui <ray.huang@amd.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Jiuyang Liu <liu@jiuyang.me>, Yichuan Gao <i@gycis.me>,
Yangyu Chen <cyy@cyyself.name>
Subject: [PATCH] drm/ttm: only use DMA32 if needed for dummy_read_page
Date: Tue, 16 Jan 2024 15:24:06 +0800 [thread overview]
Message-ID: <tencent_0B319B215E8D487CC082C0DA5E8E46B86B08@qq.com> (raw)
Some platforms may not have any memory in ZONE_DMA32 and use IOMMU to allow
32-bit-DMA-only device to work. Forcing GFP_DMA32 on dummy_read_page will
fail in such platforms. Only use DMA32 when it must to get the bug
resolved.
Signed-off-by: Yangyu Chen <cyy@cyyself.name>
---
drivers/gpu/drm/ttm/ttm_device.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index d48b39132b32..62f16fb72428 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -63,7 +63,7 @@ static void ttm_global_release(void)
mutex_unlock(&ttm_global_mutex);
}
-static int ttm_global_init(void)
+static int ttm_global_init(bool use_dma32)
{
struct ttm_global *glob = &ttm_glob;
unsigned long num_pages, num_dma32;
@@ -95,7 +95,8 @@ static int ttm_global_init(void)
ttm_pool_mgr_init(num_pages);
ttm_tt_mgr_init(num_pages, num_dma32);
- glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
+ glob->dummy_read_page = use_dma32 ? alloc_page(__GFP_ZERO | GFP_DMA32) :
+ alloc_page(__GFP_ZERO);
if (unlikely(glob->dummy_read_page == NULL)) {
ret = -ENOMEM;
@@ -200,7 +201,7 @@ int ttm_device_init(struct ttm_device *bdev, const struct ttm_device_funcs *func
if (WARN_ON(vma_manager == NULL))
return -EINVAL;
- ret = ttm_global_init();
+ ret = ttm_global_init(use_dma32);
if (ret)
return ret;
--
2.43.0
next reply other threads:[~2024-01-16 7:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-16 7:24 Yangyu Chen [this message]
2024-01-16 9:45 ` [PATCH] drm/ttm: only use DMA32 if needed for dummy_read_page Christian König
2024-01-16 11:27 ` Yangyu Chen
2024-01-16 14:45 ` Christian König
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