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Since we are touching the device to read the registers, we are required to ensure the device is awake at the time. Currently, we believe ourselves to be inside the active request [thus an active engine wakeref], but since that may be retired in the background, we can spontaneously lose the wakeref and the ability to probe the HW. <4> [379.686703] RPM wakelock ref not held during HW access <4> [379.686805] WARNING: CPU: 7 PID: 4869 at ./drivers/gpu/drm/i915/intel_runtime_pm.h:115 gen12_fwtable_read32+0x233/0x300 [i915] <4> [379.686808] Modules linked in: i915(+) vgem snd_hda_codec_hdmi mei_hdcp x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul ax88179_178a usbnet mii ghash_clmulni_intel snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core snd_pcm e1000e mei_me ptp mei pps_core intel_lpss_pci prime_numbers [last unloaded: i915] <4> [379.686827] CPU: 7 PID: 4869 Comm: i915_selftest Tainted: G U 5.7.0-rc1-CI-CI_DRM_8313+ #1 <4> [379.686830] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake U DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.2457.A13.1912190237 12/19/2019 <4> [379.686883] RIP: 0010:gen12_fwtable_read32+0x233/0x300 [i915] <4> [379.686887] Code: d8 ea e0 0f 0b e9 19 fe ff ff 80 3d ad 12 2d 00 00 0f 85 17 fe ff ff 48 c7 c7 b0 32 3e a0 c6 05 99 12 2d 00 01 e8 2d d8 ea e0 <0f> 0b e9 fd fd ff ff 8b 05 c4 75 56 e2 85 c0 0f 85 84 00 00 00 48 <4> [379.686889] RSP: 0018:ffffc90000727970 EFLAGS: 00010286 <4> [379.686892] RAX: 0000000000000000 RBX: ffff88848cc20ee8 RCX: 0000000000000001 <4> [379.686894] RDX: 0000000080000001 RSI: ffff88843b1f0900 RDI: 00000000ffffffff <4> [379.686896] RBP: 0000000000000000 R08: ffff88843b1f0900 R09: 0000000000000000 <4> [379.686898] R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000a058 <4> [379.686900] R13: 0000000000000001 R14: ffff88848cc2bf30 R15: 00000000ffffffea <4> [379.686902] FS: 00007f7d63f5e300(0000) GS:ffff8884a0180000(0000) knlGS:0000000000000000 <4> [379.686904] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4> [379.686907] CR2: 000055e5c30f4988 CR3: 000000042e190002 CR4: 0000000000760ee0 <4> [379.686910] PKRU: 55555554 <4> [379.686911] Call Trace: <4> [379.686986] live_rps_interrupt+0xb14/0xc10 [i915] <4> [379.687051] ? intel_rps_unpark+0xb0/0xb0 [i915] <4> [379.687057] ? __trace_bprintk+0x57/0x80 <4> [379.687143] __i915_subtests+0xb8/0x210 [i915] <4> [379.687222] ? __i915_live_teardown+0x50/0x50 [i915] <4> [379.687291] ? __intel_gt_live_setup+0x30/0x30 [i915] <4> [379.687361] __run_selftests+0x112/0x170 [i915] <4> [379.687431] i915_live_selftests+0x2c/0x60 [i915] <4> [379.687491] i915_pci_probe+0x93/0x1b0 [i915] Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Andi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200417093928.17822-2-chris@chris-wilson.co.uk |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.