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From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: Felix.Kuehling@amd.com, alexander.deucher@amd.com,
	christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@linux.ie,
	daniel@ffwll.ch
Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH 2/2] drm/amdkfd: Slighly optimize 'init_doorbell_bitmap()'
Date: Sun, 21 Nov 2021 18:41:40 +0100	[thread overview]
Message-ID: <3e54737649cf94daabaa5b51db9f4c21d43124fe.1637516393.git.christophe.jaillet@wanadoo.fr> (raw)
In-Reply-To: <2343a4e6547a8436419308744ba8c433088922a5.1637516393.git.christophe.jaillet@wanadoo.fr>

The 'doorbell_bitmap' bitmap has just been allocated. So we can use the
non-atomic '__set_bit()' function to save a few cycles as no concurrent
access can happen.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
bitmap_set() could certainly also be use, but range checking would be
tricky.
---
 drivers/gpu/drm/amd/amdkfd/kfd_process.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 172ee8763523..2e9d341062c4 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -1447,9 +1447,9 @@ static int init_doorbell_bitmap(struct qcm_process_device *qpd,
 
 	for (i = 0; i < KFD_MAX_NUM_OF_QUEUES_PER_PROCESS / 2; i++) {
 		if (i >= range_start && i <= range_end) {
-			set_bit(i, qpd->doorbell_bitmap);
-			set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
-				qpd->doorbell_bitmap);
+			__set_bit(i, qpd->doorbell_bitmap);
+			__set_bit(i + KFD_QUEUE_DOORBELL_MIRROR_OFFSET,
+				  qpd->doorbell_bitmap);
 		}
 	}
 
-- 
2.30.2


  reply	other threads:[~2021-11-21 17:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-21 17:41 [PATCH 1/2] drm/amdkfd: Use bitmap_zalloc() when applicable Christophe JAILLET
2021-11-21 17:41 ` Christophe JAILLET [this message]
2021-11-22 21:44   ` [PATCH 2/2] drm/amdkfd: Slighly optimize 'init_doorbell_bitmap()' Felix Kuehling
2021-11-23  6:02     ` Christophe JAILLET

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