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Message-Id: <20221017093726.2070674-8-zhao1.liu@linux.intel.com>
Date: Mon, 17 Oct 2022 17:37:23 +0800
From: Zhao Liu <zhao1.liu@...ux.intel.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Matthew Auld <matthew.auld@...el.com>,
Thomas Hellström
<thomas.hellstrom@...ux.intel.com>,
Nirmoy Das <nirmoy.das@...el.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Chris Wilson <chris@...is-wilson.co.uk>,
Christian König <christian.koenig@....com>,
intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Cc: Ira Weiny <ira.weiny@...el.com>,
"Fabio M . De Francesco" <fmdefrancesco@...il.com>,
Zhenyu Wang <zhenyu.z.wang@...el.com>,
Zhao Liu <zhao1.liu@...el.com>
Subject: [PATCH 7/9] drm/i915: Use memcpy_from_page() in gt/uc/intel_uc_fw.c
From: Zhao Liu <zhao1.liu@...el.com>
The use of kmap_atomic() is being deprecated in favor of
kmap_local_page()[1].
The main difference between atomic and local mappings is that local
mappings doesn't disable page faults or preemption.
In drm/i915/gt/uc/intel_us_fw.c, the function intel_uc_fw_copy_rsa()
just use the mapping to do memory copy so it doesn't need to disable
pagefaults and preemption for mapping. Thus the local mapping without
atomic context (not disable pagefaults / preemption) is enough.
Therefore, intel_uc_fw_copy_rsa() is a function where the use of
memcpy_from_page() with kmap_local_page() in place of memcpy() with
kmap_atomic() is correctly suited.
Convert the calls of memcpy() with kmap_atomic() / kunmap_atomic() to
memcpy_from_page() which uses local mapping to copy.
[1]: https://lore.kernel.org/all/20220813220034.806698-1-ira.weiny@intel.com/T/#u
Suggested-by: Ira Weiny <ira.weiny@...el.com>
Suggested-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
Signed-off-by: Zhao Liu <zhao1.liu@...el.com>
---
Suggested by credits:
Ira: Referred to his task document and suggestions about using
memcpy_from_page() directly.
Fabio: Referred to his boiler plate commit message.
---
drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index b91ad4aede1f..64d56f175d32 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -962,16 +962,13 @@ size_t intel_uc_fw_copy_rsa(struct intel_uc_fw *uc_fw, void *dst, u32 max_len)
for_each_sgt_page(page, iter, uc_fw->obj->mm.pages) {
u32 len = min_t(u32, size, PAGE_SIZE - offset);
- void *vaddr;
if (idx > 0) {
idx--;
continue;
}
- vaddr = kmap_atomic(page);
- memcpy(dst, vaddr + offset, len);
- kunmap_atomic(vaddr);
+ memcpy_from_page(dst, page, offset, len);
offset = 0;
dst += len;
--
2.34.1
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