On Mon, Mar 13, 2017 at 03:41:34PM +0200, Mika Kuoppala wrote: > Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes: > > > i915_drpc_info missed covering a few register read with the runtime pm > > wakelock. Be simple and cover the entire function with a single wakelock > > so that new additions are not similarly missed in future. > > > > WARNING: CPU: 2 PID: 1334 at drivers/gpu/drm/i915/intel_drv.h:1743 gen6_read32+0x192/0x1e0 [i915] > > RPM wakelock ref not held during HW access > > Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver netconsole nfsd auth_rpcgss ipmi_watchdog ipmi_poweroff ipmi_devintf ipmi_msghandler overlay btrfs xor raid6_pq dm_mod sg sd_mod snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ata_generic pata_acpi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_intel kvm_intel snd_hda_codec kvm eeepc_wmi irqbypass snd_hda_core crct10dif_pclmul crc32_pclmul crc32c_intel asus_wmi sparse_keymap ghash_clmulni_intel snd_hwdep i915 rfkill ppdev pcbc aesni_intel ata_piix crypto_simd glue_helper snd_pcm pata_via cryptd pcspkr snd_timer drm_kms_helper syscopyarea snd sysfillrect libata sysimgblt fb_sys_fops soundcore shpchp drm wmi parport_pc parport tpm_infineon video > > CPU: 2 PID: 1334 Comm: php5 Not tainted 4.10.0-rc8-01615-g1f58c8e #1 > > Hardware name: System manufacturer System Product Name/P8H67-M PRO, BIOS 1002 04/01/2011 > > Call Trace: > > dump_stack+0x63/0x8a > > __warn+0xcb/0xf0 > > warn_slowpath_fmt+0x4f/0x60 > > ? seq_vprintf+0x35/0x50 > > gen6_read32+0x192/0x1e0 [i915] > > i915_drpc_info+0x55d/0x990 [i915] > > seq_read+0xf2/0x3b0 > > full_proxy_read+0x51/0x80 > > __vfs_read+0x28/0x130 > > ? security_file_permission+0x9b/0xc0 > > ? rw_verify_area+0x4e/0xb0 > > vfs_read+0xa8/0x170 > > SyS_read+0x46/0xa0 > > entry_SYSCALL_64_fastpath+0x1a/0xa9 > > RIP: 0033:0x7fd97bf175a0 > > RSP: 002b:00007ffdf730db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 > > RAX: ffffffffffffffda RBX: 00007fd978028738 RCX: 00007fd97bf175a0 > > RDX: 0000000000002000 RSI: 00007fd97740e0d8 RDI: 0000000000000005 > > RBP: 0000000000000001 R08: 0000000000e97840 R09: 00007fd977ef8d58 > > R10: 0000000000000027 R11: 0000000000000246 R12: 00007fd977ef8d58 > > R13: 0000000000000000 R14: 0000000000eb4640 R15: 0000000000000000 > > > > Reported-by: kernel test robot <xiaolong.ye@xxxxxxxxx> > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > While reading this I pondered if mutexing the whole read sequence > would add value. To give 'atomic' snapshot of state. > > But that is a separate issue. > > Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx> Thanks, pushed. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
