Date:   Thu, 27 Dec 2018 09:26:26 +0000
From:   "Qu, Jim" <Jim.Qu@....com>
To:     Kangjie Lu <kjlu@....edu>
CC:     "Zhou, David(ChunMing)" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        "Xu, Feifei" <Feifei.Xu@....com>,
        "Francis, David" <David.Francis@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "Huang, Ray" <Ray.Huang@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel@...ll.ch>,
        "pakki001@....edu" <pakki001@....edu>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Gao, Likun" <Likun.Gao@....com>, "Zhu, Rex" <Rex.Zhu@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Zhang, Hawking" <Hawking.Zhang@....com>
Subject: 答复: [PATCH] gpu: drm: fix an improper check of amdgpu_bo_create_kernel


Comments in line.

Thanks
JimQu
________________________________________
发件人: amd-gfx <amd-gfx-bounces@...ts.freedesktop.org> 代表 Kangjie Lu <kjlu@....edu>
发送时间: 2018年12月26日 14:23
收件人: kjlu@....edu
抄送: Zhou, David(ChunMing); David Airlie; Xu, Feifei; Francis, David; linux-kernel@...r.kernel.org; amd-gfx@...ts.freedesktop.org; Huang, Ray; dri-devel@...ts.freedesktop.org; Daniel Vetter; pakki001@....edu; Deucher, Alexander; Gao, Likun; Zhu, Rex; Koenig, Christian; Zhang, Hawking
主题: [PATCH] gpu: drm: fix an improper check of amdgpu_bo_create_kernel

adev->firmware.fw_buf being not NULL may not indicate kernel buffer is
created successful. A better way is to check the status (return value)
of it. The fix does so.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
index 7b33867036e7..ba3c1cfb2c35 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c
@@ -422,13 +422,19 @@ static int amdgpu_ucode_patch_jt(struct amdgpu_firmware_info *ucode,

 int amdgpu_ucode_create_bo(struct amdgpu_device *adev)
 {
+       int ret;
+
        if (adev->firmware.load_type != AMDGPU_FW_LOAD_DIRECT) {
-               amdgpu_bo_create_kernel(adev, adev->firmware.fw_size, PAGE_SIZE,
-                       amdgpu_sriov_vf(adev) ? AMDGPU_GEM_DOMAIN_VRAM : AMDGPU_GEM_DOMAIN_GTT,
-                       &adev->firmware.fw_buf,
-                       &adev->firmware.fw_buf_mc,
-                       &adev->firmware.fw_buf_ptr);
-               if (!adev->firmware.fw_buf) {
+               ret =
+                       amdgpu_bo_create_kernel(adev,
+                         adev->firmware.fw_size,
+                         PAGE_SIZE,
+                         amdgpu_sriov_vf(adev) ? AMDGPU_GEM_DOMAIN_VRAM :
+                               AMDGPU_GEM_DOMAIN_GTT,
+                         &adev->firmware.fw_buf,
+                         &adev->firmware.fw_buf_mc,
+                               &adev->firmware.fw_buf_ptr);
+               if (ret) {

JimQu: Look into amdgpu_bo_create_kernel(), new bo will be created only if *bo_ptr = NULL, So if you encounter the issue the adev->firmware.fw_buf != NULL but new bo is not created, the only problem I can see are:

1. there is bug in amdgpu_bo_create_kernel()
2. adev->firmware.fw_buf != NULL before it is transferred into amdgpu_bo_create_kernel().

Could you commit what is environment you encounter the issue?

Thanks
JimQu 
                        dev_err(adev->dev, "failed to create kernel buffer for firmware.fw_buf\n");
                        return -ENOMEM;
                } else if (amdgpu_sriov_vf(adev)) {
--
2.17.2 (Apple Git-113)

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