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From:   Zhao Liu <zhao1.liu@linux.intel.com>
To:     Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Matthew Auld <matthew.auld@intel.com>,
        =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= 
        <thomas.hellstrom@linux.intel.com>,
        Nirmoy Das <nirmoy.das@intel.com>,
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        Chris Wilson <chris@chris-wilson.co.uk>,
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        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
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Cc:     Ira Weiny <ira.weiny@intel.com>,
        "Fabio M . De Francesco" <fmdefrancesco@gmail.com>,
        Zhenyu Wang <zhenyu.z.wang@intel.com>,
        Zhao Liu <zhao1.liu@intel.com>
Subject: [PATCH 7/9] drm/i915: Use memcpy_from_page() in gt/uc/intel_uc_fw.c
Date:   Mon, 17 Oct 2022 17:37:23 +0800
Message-Id: <20221017093726.2070674-8-zhao1.liu@linux.intel.com>
In-Reply-To: <20221017093726.2070674-1-zhao1.liu@linux.intel.com>
References: <20221017093726.2070674-1-zhao1.liu@linux.intel.com>
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From: Zhao Liu <zhao1.liu@intel.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@intel.com>
Suggested-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.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