Re: [PATCH] drm/amdgpu: Bail earlier when amdgpu.cik_/si_support is not set to 1

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Hi,

On 10-10-2019 18:59, Daniel Vetter wrote:
On Thu, Oct 10, 2019 at 6:28 PM Hans de Goede <hdegoede@xxxxxxxxxx> wrote:

Bail from the pci_driver probe function instead of from the drm_driver
load function.

This avoid /dev/dri/card0 temporarily getting registered and then
unregistered again, sending unwanted add / remove udev events to
userspace.

Specifically this avoids triggering the (userspace) bug fixed by this
plymouth merge-request:
https://gitlab.freedesktop.org/plymouth/plymouth/merge_requests/59

Note that despite that being a userspace bug, not sending unnecessary
udev events is a good idea in general.

I think even better would be getting rid of the load/unload callbacks,
this issue here isn't the only problem with them.

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

Thanks,

I guess also cc: stable material?

Yes.

amdgpu maintainers, can you please add a Cc: stable while merging?
Let me know if you want a new version with this added.

Regards,

Hans



BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1490490
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 35 +++++++++++++++++++++++++
  drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 35 -------------------------
  2 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 6f8aaf655a9f..2a00a36106b2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1048,6 +1048,41 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
                 return -ENODEV;
         }

+#ifdef CONFIG_DRM_AMDGPU_SI
+       if (!amdgpu_si_support) {
+               switch (flags & AMD_ASIC_MASK) {
+               case CHIP_TAHITI:
+               case CHIP_PITCAIRN:
+               case CHIP_VERDE:
+               case CHIP_OLAND:
+               case CHIP_HAINAN:
+                       dev_info(&pdev->dev,
+                                "SI support provided by radeon.\n");
+                       dev_info(&pdev->dev,
+                                "Use radeon.si_support=0 amdgpu.si_support=1 to override.\n"
+                               );
+                       return -ENODEV;
+               }
+       }
+#endif
+#ifdef CONFIG_DRM_AMDGPU_CIK
+       if (!amdgpu_cik_support) {
+               switch (flags & AMD_ASIC_MASK) {
+               case CHIP_KAVERI:
+               case CHIP_BONAIRE:
+               case CHIP_HAWAII:
+               case CHIP_KABINI:
+               case CHIP_MULLINS:
+                       dev_info(&pdev->dev,
+                                "CIK support provided by radeon.\n");
+                       dev_info(&pdev->dev,
+                                "Use radeon.cik_support=0 amdgpu.cik_support=1 to override.\n"
+                               );
+                       return -ENODEV;
+               }
+       }
+#endif
+
         /* Get rid of things like offb */
         ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "amdgpudrmfb");
         if (ret)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index f2c097983f48..d55f5baa83d3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -144,41 +144,6 @@ int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags)
         struct amdgpu_device *adev;
         int r, acpi_status;

-#ifdef CONFIG_DRM_AMDGPU_SI
-       if (!amdgpu_si_support) {
-               switch (flags & AMD_ASIC_MASK) {
-               case CHIP_TAHITI:
-               case CHIP_PITCAIRN:
-               case CHIP_VERDE:
-               case CHIP_OLAND:
-               case CHIP_HAINAN:
-                       dev_info(dev->dev,
-                                "SI support provided by radeon.\n");
-                       dev_info(dev->dev,
-                                "Use radeon.si_support=0 amdgpu.si_support=1 to override.\n"
-                               );
-                       return -ENODEV;
-               }
-       }
-#endif
-#ifdef CONFIG_DRM_AMDGPU_CIK
-       if (!amdgpu_cik_support) {
-               switch (flags & AMD_ASIC_MASK) {
-               case CHIP_KAVERI:
-               case CHIP_BONAIRE:
-               case CHIP_HAWAII:
-               case CHIP_KABINI:
-               case CHIP_MULLINS:
-                       dev_info(dev->dev,
-                                "CIK support provided by radeon.\n");
-                       dev_info(dev->dev,
-                                "Use radeon.cik_support=0 amdgpu.cik_support=1 to override.\n"
-                               );
-                       return -ENODEV;
-               }
-       }
-#endif
-
         adev = kzalloc(sizeof(struct amdgpu_device), GFP_KERNEL);
         if (adev == NULL) {
                 return -ENOMEM;
--
2.23.0




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