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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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539 lines
35 KiB
HTML
539 lines
35 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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</head>
|
||
<body id="gem5-graphic-mode-internals" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="gem5-graphic-mode-internals"><a class="anchor" href="#gem5-graphic-mode-internals"></a><a class="link" href="#gem5-graphic-mode-internals">14.3.3. gem5 graphic mode internals</a></h4>
|
||
<div class="paragraph">
|
||
<p>We cannot use mainline Linux because the <a href="gem5-arm-linux-kernel-patches.html">gem5 arm Linux kernel patches</a> are required at least to provide the <code>CONFIG_DRM_VIRT_ENCODER</code> option.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>gem5 emulates the <a href="http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0541c/CHDBAIDI.html">HDLCD</a> ARM Holdings hardware for <code>arm</code> and <code>aarch64</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The kernel uses HDLCD to implement the <a href="drm.html">DRM</a> interface, the required kernel config options are present at: <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/linux_config/display">linux_config/display</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: minimize out the <code>--custom-config-file</code>. If we just remove it on <code>arm</code>: it does not work with a failing dmesg:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>[ 0.066208] [drm] found ARM HDLCD version r0p0
|
||
[ 0.066241] hdlcd 2b000000.hdlcd: bound virt-encoder (ops drm_vencoder_ops)
|
||
[ 0.066247] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
|
||
[ 0.066252] [drm] No driver support for vblank timestamp query.
|
||
[ 0.066276] hdlcd 2b000000.hdlcd: Cannot do DMA to address 0x0000000000000000
|
||
[ 0.066281] swiotlb: coherent allocation failed for device 2b000000.hdlcd size=8294400
|
||
[ 0.066288] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.15.0 #1
|
||
[ 0.066293] Hardware name: V2P-AARCH64 (DT)
|
||
[ 0.066296] Call trace:
|
||
[ 0.066301] dump_backtrace+0x0/0x1b0
|
||
[ 0.066306] show_stack+0x24/0x30
|
||
[ 0.066311] dump_stack+0xb8/0xf0
|
||
[ 0.066316] swiotlb_alloc_coherent+0x17c/0x190
|
||
[ 0.066321] __dma_alloc+0x68/0x160
|
||
[ 0.066325] drm_gem_cma_create+0x98/0x120
|
||
[ 0.066330] drm_fbdev_cma_create+0x74/0x2e0
|
||
[ 0.066335] __drm_fb_helper_initial_config_and_unlock+0x1d8/0x3a0
|
||
[ 0.066341] drm_fb_helper_initial_config+0x4c/0x58
|
||
[ 0.066347] drm_fbdev_cma_init_with_funcs+0x98/0x148
|
||
[ 0.066352] drm_fbdev_cma_init+0x40/0x50
|
||
[ 0.066357] hdlcd_drm_bind+0x220/0x428
|
||
[ 0.066362] try_to_bring_up_master+0x21c/0x2b8
|
||
[ 0.066367] component_master_add_with_match+0xa8/0xf0
|
||
[ 0.066372] hdlcd_probe+0x60/0x78
|
||
[ 0.066377] platform_drv_probe+0x60/0xc8
|
||
[ 0.066382] driver_probe_device+0x30c/0x478
|
||
[ 0.066388] __driver_attach+0x10c/0x128
|
||
[ 0.066393] bus_for_each_dev+0x70/0xb0
|
||
[ 0.066398] driver_attach+0x30/0x40
|
||
[ 0.066402] bus_add_driver+0x1d0/0x298
|
||
[ 0.066408] driver_register+0x68/0x100
|
||
[ 0.066413] __platform_driver_register+0x54/0x60
|
||
[ 0.066418] hdlcd_platform_driver_init+0x20/0x28
|
||
[ 0.066424] do_one_initcall+0x44/0x130
|
||
[ 0.066428] kernel_init_freeable+0x13c/0x1d8
|
||
[ 0.066433] kernel_init+0x18/0x108
|
||
[ 0.066438] ret_from_fork+0x10/0x1c
|
||
[ 0.066444] hdlcd 2b000000.hdlcd: Failed to set initial hw configuration.
|
||
[ 0.066470] hdlcd 2b000000.hdlcd: master bind failed: -12
|
||
[ 0.066477] hdlcd: probe of 2b000000.hdlcd failed with error -12</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So what other options are missing from <code>gem5_defconfig</code>? It would be cool to minimize it out to better understand the options.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
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|
||
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|
||
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|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="gem5-graphic-mode-dp650.html">gem5 graphic mode DP650</a> | ↑ Up: <a href="gem5-graphic-mode.html">gem5 graphic mode</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="x11.html">X11 Buildroot</a> →</p>
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