linux-kernel - [RESEND PATCH 1/3] drm/i915: Replace kmap() with kmap_local

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Message-Id: <20221016180938.17403-2-fmdefrancesco@gmail.com>
Date:   Sun, 16 Oct 2022 20:09:36 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.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>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        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>,
        Christian König <christian.koenig@....com>,
        Matt Roper <matthew.d.roper@...el.com>,
        John Harrison <John.C.Harrison@...el.com>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, intel-gvt-dev@...ts.freedesktop.org
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        "Venkataramanan, Anirudh" <anirudh.venkataramanan@...el.com>,
        Ira Weiny <ira.weiny@...el.com>
Subject: [RESEND PATCH 1/3] drm/i915: Replace kmap() with kmap_local_page()

kmap() is being deprecated in favor of kmap_local_page().

There are two main problems with kmap(): (1) It comes with an overhead as
mapping space is restricted and protected by a global lock for
synchronization and (2) it also requires global TLB invalidation when the
kmap’s pool wraps and it might block when the mapping space is fully
utilized until a slot becomes available.

With kmap_local_page() the mappings are per thread, CPU local, can take
page faults, and can be called from any context (including interrupts).
It is faster than kmap() in kernels with HIGHMEM enabled. Furthermore,
the tasks can be preempted and, when they are scheduled to run again, the
kernel virtual addresses are restored and are still valid.

Since its use in i915_gem.c is safe everywhere, it should be preferred.

Therefore, replace kmap() with kmap_local_page() in i915_gem.c

Cc: "Venkataramanan, Anirudh" <anirudh.venkataramanan@...el.com>
Suggested-by: Ira Weiny <ira.weiny@...el.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 702e5b89be22..43effce60e1b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -212,14 +212,14 @@ shmem_pread(struct page *page, int offset, int len, char __user *user_data,
 	char *vaddr;
 	int ret;
 
-	vaddr = kmap(page);
+	vaddr = kmap_local_page(page);
 
 	if (needs_clflush)
 		drm_clflush_virt_range(vaddr + offset, len);
 
 	ret = __copy_to_user(user_data, vaddr + offset, len);
 
-	kunmap(page);
+	kunmap_local(vaddr);
 
 	return ret ? -EFAULT : 0;
 }
@@ -634,7 +634,7 @@ shmem_pwrite(struct page *page, int offset, int len, char __user *user_data,
 	char *vaddr;
 	int ret;
 
-	vaddr = kmap(page);
+	vaddr = kmap_local_page(page);
 
 	if (needs_clflush_before)
 		drm_clflush_virt_range(vaddr + offset, len);
@@ -643,7 +643,7 @@ shmem_pwrite(struct page *page, int offset, int len, char __user *user_data,
 	if (!ret && needs_clflush_after)
 		drm_clflush_virt_range(vaddr + offset, len);
 
-	kunmap(page);
+	kunmap_local(vaddr);
 
 	return ret ? -EFAULT : 0;
 }
-- 
2.37.1