re: kern/56245: NetBSD 9.2 amd64 with AMD FirePro W4100 throws constant kernel errors of 'Can't enable IRQ/MSI because no handler is installed'

[matthew green <mrg%eterna.com.au@localhost>]

The following reply was made to PR kern/56245; it has been noted by GNATS.

From: matthew green <mrg%eterna.com.au@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost
Subject: re: kern/56245: NetBSD 9.2 amd64 with AMD FirePro W4100 throws constant kernel errors of 'Can't enable IRQ/MSI because no handler is installed'
Date: Mon, 14 Jun 2021 08:11:09 +1000

 this is strange.
 
 > Jun  4 18:33:45 vorlon /netbsd: [   8.6896180] radeon0: info: radeon: MS=
 I limited to 32-bit
 > Jun  4 18:33:45 vorlon /netbsd: [   8.6896180] radeon0: interrupting at =
 ioapic0 pin 16 (radeon0)
 > Jun  4 18:33:45 vorlon /netbsd: [   8.6896180] kern info: [drm] radeon: =
 irq initialized.
 
 so, MSI is not enabled, otherwise this message wuld appear:
 
    dev_info(rdev->dev, "radeon: using MSI.\n");
 
 > Jun  4 18:33:45 vorlon /netbsd: [   9.8597595] warning: /usr/src/sys/ext=
 ernal/bsd/drm2/dist/drm/radeon/radeon_si.c:6101: Can't enable IRQ/MSI beca=
 use no handler is installed
 
 so, this seems impossible.  that message happens if
 rdev->irq.installed is not set in si_irq_set().
 
 si_startup() checks if it's not enabled, and then
 calls radeon_irq_kms_init() to set it, which sets
 installed =3D true, so the call a few lines later to
 si_irq_set() should have it set, instead of the
 error message it displays and doesn't setup.
 
 i don't see a path that doesn't do this, but i guess
 there's something i'm missing.
 
 > spamming syslog messages.
 > [ 428896.996373] kern error: [drm:(/usr/src/sys/external/bsd/drm2/dist/d=
 rm/radeon/radeon_si_dpm.c:6697)si_dpm_set_power_state] *ERROR* si_enable_s=
 mc_cac fail ed
 
 this happens on r600 as well, i never got around to look at why.
 
 
 .mrg.