[Bug 215652] New: kernel 5.17-rc fail to load radeon DRM "modprobe: ERROR: could not insert 'radeon': Unknown symbol in module, or unknown parameter (see dmesg)"

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https://bugzilla.kernel.org/show_bug.cgi?id=215652

            Bug ID: 215652
           Summary: kernel 5.17-rc fail to load radeon DRM "modprobe:
                    ERROR: could not insert 'radeon': Unknown symbol in
                    module, or unknown parameter (see dmesg)"
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.17-rc5
          Hardware: PPC-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
          Reporter: erhard_f@xxxxxxxxxxx
                CC: platform_ppc-64@xxxxxxxxxxxxxxxxxxxx
        Regression: No

Created attachment 300520
  --> https://bugzilla.kernel.org/attachment.cgi?id=300520&action=edit
kernel dmesg (kernel 5.17-rc5, CONFIG_DRM_RADEON=m, Talos II)

Kernel 5.17-rc5 has problems loading the radeon KMS module on my Talos II:

 # modprobe -v radeon
insmod /lib/modules/5.17.0-rc5-P9+/kernel/drivers/gpu/drm/drm_kms_helper.ko 
modprobe: ERROR: could not insert 'radeon': Unknown symbol in module, or
unknown parameter (see dmesg)

dmesg show no further output then.

When I build a kernel with CONFIG_DRM_RADEON=y I get this in dmesg:
[...]
ATOM BIOS: X1550
[drm] Generation 2 PCI interface, using max accessible memory
radeon 0000:01:00.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M
used)
radeon 0000:01:00.0: GTT: 512M 0x0000000020000000 - 0x000000003FFFFFFF
[drm] Detected VRAM RAM=512M, BAR=256M
[drm] RAM width 128bits DDR
radeon 0000:01:00.0: dma_iommu_get_required_mask: returning bypass mask
0xfffffffffffffff
[drm] radeon: 512M of VRAM memory ready
[drm] radeon: 512M of GTT memory ready.
[drm] GART: num cpu pages 131072, num gpu pages 131072
[drm] radeon: 1 quad pipes, 1 z pipes initialized.
[drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
radeon 0000:01:00.0: WB enabled
radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000020000000
radeon 0000:01:00.0: radeon: MSI limited to 32-bit
[drm] radeon: irq initialized.
[drm] Loading R500 Microcode
radeon 0000:01:00.0: Direct firmware load for radeon/R520_cp.bin failed with
error -2
radeon_cp: Failed to load firmware "radeon/R520_cp.bin"
[drm:.r100_cp_init] *ERROR* Failed to load firmware!
radeon 0000:01:00.0: failed initializing CP (-2).
radeon 0000:01:00.0: Disabling GPU acceleration

So it complains about not finding the relevant firmware. But the firmware being
located in everything should be ok. This used to work on kernels 5.16.x and
before.

 # ls -al /lib/firmware/radeon/R520_cp.bin
-rw-r--r-- 1 root root 2048  2. Mär 20:43 /lib/firmware/radeon/R520_cp.bin


Some data about the machine:
 # lspci 
0000:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0000:01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RV516 [Radeon X1300/X1550 Series]
0000:01:00.1 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] RV516
[Radeon X1300/X1550 Series] (Secondary)
0001:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0001:01:00.0 Non-Volatile memory controller: Phison Electronics Corporation
Device 5008 (rev 01)
0002:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0003:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0003:01:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI
Host Controller (rev 02)
0004:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0004:01:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme
BCM5719 Gigabit Ethernet PCIe (rev 01)
0004:01:00.1 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme
BCM5719 Gigabit Ethernet PCIe (rev 01)
0005:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0005:01:00.0 PCI bridge: ASPEED Technology, Inc. AST1150 PCI-to-PCI Bridge (rev
04)
0005:02:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED Graphics
Family (rev 41)
0030:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0031:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0032:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)
0033:00:00.0 PCI bridge: IBM POWER9 Host Bridge (PHB4)

 # lspci -s 0000:01:00.0 -vv
0000:01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RV516 [Radeon X1300/X1550 Series] (prog-if 00 [VGA controller])
        Subsystem: PC Partner Limited / Sapphire Technology RV516 [Radeon
X1300/X1550 Series]
        Device tree node:
/sys/firmware/devicetree/base/pciex@600c3c0000000/pci@0/vga@0
        Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr+
Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Interrupt: pin A routed to IRQ 42
        NUMA node: 0
        IOMMU group: 0
        Region 0: Memory at 6000000000000 (64-bit, prefetchable) [size=256M]
        Region 2: Memory at 600c000020000 (64-bit, non-prefetchable) [size=64K]
        Region 4: I/O ports at <unassigned> [disabled]
        Expansion ROM at 600c000000000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [58] Express (v1) Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1
unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE- FLReset-
SlotPowerLimit 0.000W
                DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit
Latency L0s <64ns, L1 <1us
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s (ok), Width x16 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Kernel driver in use: radeon

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