Re: writing custom driver for VGA emulation ?

Christian König <ckoenig.leichtzumerken@xxxxxxxxx> · Tue, 18 Feb 2020 20:22:56 +0100



    Hi Yusuf,

      
      Is that means driver can do its job
        without powerplay support ?
      No, the driver tries to bind to the device but fails to load
      correctly. You won't get any functionality from this.

      
      If so, how does userspace programs like
        Xorg or as you mentioned Vesa can interact with driver.
      No, sounds like you misunderstood what Vesa driver is here.

      
      Vesa is driver the hardware without the amdgpu kernel driver
      through calls into the video BIOS.

      
      You wouldn't have any acceleration and only limited display modes,
      but at least you get a picture on the screen.

      
      I see no driver node named 'amdgpu' under
        '/dev/' directory or subdirectories ?
      That's normal. The driver doesn't have a dedicated node.

      
      Take a look under /dev/dri instead. The graphics cards in the
      system are just named card0, card1, card2....

      
      Regards,

      Christian.

      
      Am 18.02.20 um 19:59 schrieb Yusuf Altıparmak:

    
      Hello Christian,
        

        Even if powerplay fails, gpu driver seems still working
          according to output of "lsmod' command. I can see amdgpu
          there. Is that means driver can do its job without powerplay
          support ?
        

        If so, how does userspace programs like Xorg or as you
          mentioned Vesa can interact with driver. I see no driver node
          named 'amdgpu' under '/dev/' directory or subdirectories ?
          Does this driver provide a driver node ?
        

        By the way, thanks for your interest.
        

        Best regards.
        

          Christian König <ckoenig.leichtzumerken@xxxxxxxxx>,
            18 Şub 2020 Sal, 18:33 tarihinde şunu yazdı:

          
              Hi Yusuf,

                
                good to hear that you were able to solve your MMIO
                problems.

                
                And yes amdgpu has unfortunately some bugs on big endian
                systems.

                
                But as John noted when you solved the issues with the
                MMIO BARs you can also use the Vesa driver with the VGA
                emulation.

                
                Regards,

                Christian.

                
                Am 18.02.20 um 16:00 schrieb Yusuf Altıparmak:

              
                        Hello Mr. Alex, Mr. Cönig and
                            Mr. Bridgman, 
                        

                        Mr. Cönig, we have talked
                            about MMIO problem before. You helped me a
                            lot about that and now driver is not giving
                            any error about MMIO. That problem was about
                            bus configuration of my embedded system. It
                            does not proceed more than 4GB besides 0x0
                            adress is aligned for I/O and MMIO is
                            allowed between 0xE0000000 and 0xffffffff.
                            Fortunately, I now am able to claim 256 MB
                            and other 4 BARs adress between this range.
                            I can attach lspci -v output. 
                        

                        Mr. Bridgman, I am using
                            U-boot as bootloader and the system is 64
                            bit PowerPc e5500 core. This means big
                            endian kernel. 
                        

                        Right now, the driver
                            'amdgpu' is having error when 
                        it tries to load smc
                            firmware. I ve been trying to solve this
                            problem for months but I haven't solve it
                            yet. 
                        

                        Other firmwares seems loading
                            without any error. I was suspecting that
                            endianness is causing this problem but if it
                            was shouldn't other firmwares get fail
                            before smc firmware gets loaded? 
                        

                        I tried all of the firmwares
                            in repository but result remained same. 
                        

                        Full dmesg:

                        
                        [    5.426009] [drm] amdgpu
                          kernel modesetting enabled.                   
                                                                       
                              
                        [    5.430109] [drm] initializing kernel
                        modesetting (POLARIS12 0x1002:0x6987
                        0x1787:0x2389 0x80).                          

                        [    5.437591] [drm] register mmio base:
                        0x20200000                                      
                                                           

                        [    5.440899] [drm] register mmio size: 262144
                                                                       
                                                     
                        [    5.443888] [drm] add ip block number 0
                        <vi_common>                              
                                                               

                        [    5.447465] [drm] add ip block number 1
                        <gmc_v8_0>                                
                                                               

                        [    5.450953] [drm] add ip block number 2
                        <tonga_ih>                                
                                                               

                        [    5.454442] [drm] add ip block number 3
                        <powerplay>                              
                                                               

                        [    5.458018] [drm] add ip block number 4
                        <dm>                                      
                                                               

                        [    5.460979] [drm] add ip block number 5
                        <gfx_v8_0>                                
                                                               

                        [    5.464466] [drm] add ip block number 6
                        <sdma_v3_0>                              
                                                               

                        [    5.468042] [drm] add ip block number 7
                        <uvd_v6_0>                                
                                                               

                        [    5.471531] [drm] add ip block number 8
                        <vce_v3_0>                                
                                                               

                        [    5.475047] [drm] UVD is enabled in VM mode  
                                                                       
                                                   
                        [    5.477928] [drm] UVD ENC is enabled in VM
                        mode                                            
                                                     

                        [    5.481154] [drm] VCE enabled in VM mode    
                                                                       
                                                     
                        [    5.712355] ATOM BIOS: 113-ER16BFC-001      
                                                                       
                                                     
                        [    5.714830] [drm] GPU posting now...        
                                                                       
                                                     
                        [    5.833704] [drm] vm size is 64 GB, 2 levels,
                        block size is 10-bit, fragment size is 9-bit    
                                                   

                        [    5.840950] amdgpu 0001:01:00.0: BAR 2:
                        releasing [mem 0x220000000-0x2201fffff 64bit
                        pref]                                

                        [    5.847930] amdgpu 0001:01:00.0: BAR 0:
                        releasing [mem 0x210000000-0x21fffffff 64bit
                        pref]                                

                        [    5.855688] [drm:.amdgpu_device_resize_fb_bar
                        [amdgpu]] *ERROR* Problem resizing BAR0 (-2).  
                                                   

                        [    5.855706] amdgpu 0001:01:00.0: BAR 0:
                        assigned [mem 0x230000000-0x23fffffff 64bit
                        pref]                                

                        [    5.869663] amdgpu 0001:01:00.0: BAR 2:
                        assigned [mem 0x240000000-0x2401fffff 64bit
                        pref]                                

                        [    5.876582] amdgpu 0001:01:00.0: VRAM: 4096M
                        0x000000F400000000 - 0x000000F4FFFFFFFF (4096M
                        used)                        

                        [    5.884160] amdgpu 0001:01:00.0: GART: 256M
                        0x0000000000000000 - 0x000000000FFFFFFF        
                                                     

                        [    5.890519] [drm] Detected VRAM RAM=4096M,
                        BAR=256M                                        
                                                     

                        [    5.894093] [drm] RAM width 128bits GDDR5    
                                                                       
                                                   
                        [    5.896941] [TTM] Zone  kernel: Available
                        graphics memory: 4062380 kiB                    
                                                       

                        [    5.902177] [TTM] Zone   dma32: Available
                        graphics memory: 2097152 kiB                    
                                                       

                        [    5.907402] [TTM] Initializing pool allocator
                                                                       
                                                   
                        [    5.910464] [TTM] Initializing DMA pool
                        allocator                                      
                                                         

                        [    5.919973] [drm] amdgpu: 4096M of VRAM
                        memory ready                                    
                                                         

                        [    5.923659] [drm] amdgpu: 4096M of GTT memory
                        ready.                                          
                                                   

                        [    5.927358] [drm] GART: num cpu pages 65536,
                        num gpu pages 65536                            
                                                     

                        [    5.932957] [drm] PCIE GART of 256M enabled
                        (table at 0x000000F400000000).                  
                                                     

                        [    5.939122] [drm] Chained IB support enabled!
                                                                       
                                                   
                        [    5.948873] [drm] Found UVD firmware Version:
                        1.79 Family ID: 16                              
                                                   

                        [    5.953647] [drm] UVD ENC is disabled        
                                                                       
                                                   
                        [    5.975818] [drm] Found VCE firmware Version:
                        52.4 Binary ID: 3                              
                                                   

                        [    6.404774] amdgpu: [powerplay] Failed to
                        send Message.                                  
                                                       

                        [    6.835902] amdgpu: [powerplay] SMU Firmware
                        start failed!                                  
                                                     

                        [    6.840086] amdgpu: [powerplay] Failed to
                        load SMU ucode.                                
                                                       

                        [    6.844184] amdgpu: [powerplay] smc start
                        failed                                          
                                                       

                        [    6.847498] amdgpu: [powerplay] powerplay
                          hw init failed                            
                                                             

                        [    6.852281] [drm:.amdgpu_device_init
                          [amdgpu]] *ERROR* hw_init of IP block
                          <powerplay> failed -22              
                                 

                        [    6.859883] amdgpu 0001:01:00.0:
                          amdgpu_device_ip_init failed            
                                                                     
                           
                          [    6.864330] amdgpu 0001:01:00.0: Fatal
                          error during GPU init                      
                                                                 

                          [    6.868689] [drm] amdgpu: finishing
                          device.                                  
                                                                   

                        [    7.339427] pcieport 0001:00:00.0: AER:
                          Corrected error received: 0001:00:00.0        
                                                             

                          [    7.345374] pcieport 0001:00:00.0: PCIe Bus
                          Error: severity=Corrected, type=Data Link
                          Layer, (Transmitter ID)            

                          [    7.353993] pcieport 0001:00:00.0:   device
                          [1957:0824] error
                          status/mask=00001000/00002000                
                                       

                          [    7.361047] pcieport 0001:00:00.0:    [12]
                          Timeout                                  
                                                             

                        [    7.706137] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [    8.127667] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [    8.966331] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [    9.320290] pcieport 0001:00:00.0: AER:
                        Corrected error received: 0001:00:00.0          
                                                         

                        [    9.326226] pcieport 0001:00:00.0: PCIe Bus
                        Error: severity=Corrected, type=Data Link Layer,
                        (Transmitter ID)            

                        [    9.334845] pcieport 0001:00:00.0:   device
                        [1957:0824] error status/mask=00001000/00002000
                                                     

                        [    9.341899] pcieport 0001:00:00.0:    [12]
                        Timeout                                        
                                                       

                        [    9.387975] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   10.226636] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   10.648275] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   11.486932] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   11.908570] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   12.747228] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   13.168866] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   14.007523] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   14.429161] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   15.267816] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   15.689456] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   16.528114] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   16.949756] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   17.788411] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   18.210051] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   19.048710] amdgpu: [powerplay]              
                                                                       
                                                   
                                        last message was failed ret is 0
                                                                       
                                                   
                        [   19.470347] amdgpu: [powerplay]              
                                                                       
                                                   
                                        failed to send message 261 ret
                        is 0                                            
                                                     

                        [   19.786774] [TTM] Finalizing pool allocator  
                                                                       
                                                   
                        [   19.789696] [TTM] Finalizing DMA pool
                        allocator                                      
                                                           

                        [   19.793004] [TTM] Zone  kernel: Used memory
                        at exit: 0 kiB                                  
                                                     

                        [   19.797209] [TTM] Zone   dma32: Used memory
                        at exit: 0 kiB                                  
                                                     

                        [   19.801410] [drm] amdgpu: ttm finalized      
                                                                         
                                                   
                          [   19.804496] amdgpu: probe of 0001:01:00.0
                          failed with error -22 

                      
                    18 Şub 2020 Sal
                      17:43 tarihinde Bridgman, John <John.Bridgman@xxxxxxx>
                      şunu yazdı:

                    
                         [AMD Official Use Only -
                          Internal Distribution Only]

                        
                          >And
                            we already checked, 256MB is unfortunately
                            the minimum you can resize the VRAM BAR on
                            the E9171 to.

                          
                          Ahh,
                            OK... I didn't realize we had already looked
                            into that. I guess that approach isn't going
                            to work. 

                          
                          Yusef,
                            guessing you are using a 32-bit CPU ? Is it
                            possible to talk to whoever does SBIOS for
                            your platform to see if you could maybe
                            reduce address space allocated to RAM and
                            bump up the MMIO space ?

                          
                            From: Christian
                                König <ckoenig.leichtzumerken@xxxxxxxxx>

                                Sent: February 18, 2020 9:19 AM

                                To: Bridgman, John <John.Bridgman@xxxxxxx>;
                                Alex Deucher <alexdeucher@xxxxxxxxx>;
                                Yusuf Altıparmak <yusufalti1997@xxxxxxxxx>

                                Cc: amd-gfx list <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>

                                Subject: Re: writing custom
                                driver for VGA emulation ?
                               
                            
                              The problem Yusuf runs into is that
                                his platform has multiple PCIe root
                                hubs, but only 512MB of MMIO address
                                space. That is not enough to fit all the
                                BARs of an E9171 into.

                                
                                But without the BARs neither the VGA
                                emulation nor amdgpu not anything else
                                will work correctly.

                                
                                And we already checked, 256MB is
                                unfortunately the minimum you can resize
                                the VRAM BAR on the E9171 to.

                                
                                What could maybe work is to trick the
                                upstream bridge of the VGA device into
                                not routing all the addresses to the
                                BARs and actually use only a smaller
                                portion of visible VRAM. But that would
                                be highly experimental and requires a
                                rather big hack into the PCI(e)
                                subsystem in the Linux kernel.

                                
                                Regards,

                                Christian.

                                
                                Am 18.02.20 um 15:08 schrieb Bridgman,
                                John:

                              
                                 [AMD Official Use Only -
                                  Internal Distribution Only]

                                
                                  Does the VBIOS come up with
                                    something like a splash screen, ie
                                    is VBIOS able to initialize and
                                    drive the card ?

                                  
                                  If so then another option might
                                    be to use a VESA driver rather than
                                    VGA. 

                                  
                                    From:
                                        amd-gfx 
<amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Alex
                                        Deucher 
                                          <alexdeucher@xxxxxxxxx>

                                        Sent: February 18, 2020
                                        8:50 AM

                                        To: Yusuf Altıparmak 
                                          <yusufalti1997@xxxxxxxxx>

                                        Cc: amd-gfx list 
                                          <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>

                                        Subject: Re: writing
                                        custom driver for VGA emulation
                                        ?
                                       
                                    
                                          On Tue, Feb 18, 2020 at
                                            2:56 AM Yusuf Altıparmak

                                            <yusufalti1997@xxxxxxxxx>
                                            wrote:

                                            >

                                            > Hello AMD team;

                                            >

                                            > I have E 9171 GPU and
                                            want to use it on a embedded
                                            system which has limited
                                            MMIO space on PCIe bus (MAX
                                            512 MB).

                                            >

                                            > I received feedbacks
                                            that I can only use VGA
                                            emulation with this memory
                                            space. I was unable to get
                                            'amdgpu' driver working with
                                            Xorg due to I had many
                                            errors(firmwares are not
                                            loading) in each step and
                                            tired of solving them one by
                                            one.

                                            >

                                            > I want to write a
                                            simple custom driver for
                                            this GPU with kernel version
                                            4.19.

                                            > Is it possible to print
                                            some colors on screen with a
                                            custom driver over PCIe
                                            communication ? or writing
                                            some words on screen as VGA
                                            ?

                                            >

                                            > If answer is yes, then
                                            which code pieces (on amdgpu
                                            driver folder) or reference
                                            documentation should I use?
                                            I have Register Reference
                                            Guide.pdf.

                                            >

                                            > I will be appreciated
                                            for your guidance.

                                            
                                            That is not going to do what
                                            you want on your platform. 
                                            The VGA

                                            emulation requires that you
                                            set up the card first to
                                            enable it, which

                                            in turn requires MMIO access
                                            and thus you are back to
                                            square one.

                                            
                                            Alex

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