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Date: Wed, 13 Jun 2012 12:40:19 +0200
From: Luca Pizzamiglio <l.pizzamiglio@bally-wulff.de>
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Subject: Intel KMS: a memory problem
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Hi people,

I'm using 9-RELENG with KMS and the last port updated on a SandyBridge 
platform (Intel Graphics)
With a quite simple openGL application, a panic occurred:

panic: pmap_mapdev: Couldn't alloc kernel virtual memory
Tracing pid 944 tid 100105 td 0xca85c8a0
kdb_enter(c0ffe535,c0ffe535,c103dcff,efa62ac0,1,...) at kdb_enter+0x3a
panic(c103dcff,5000,c9879151,0,c1a02000,...) at panic+0x18c
pmap_mapdev_attr(c1a02000,4800,1,1,c911d980,...) at pmap_mapdev_attr+0x7e
i915_gem_obj_io(2d014008,0,4800,0,0,...) at i915_gem_obj_io+0x513
i915_gem_pwrite_ioctl(c9925800,ca827120,ca871300,c0a78b5b,efa62bd4,...) 
at i915_gem_pwrite_ioctl+0x4b
drm_ioctl(c97e0400,8020645d,ca827120,3,ca85c8a0,...) at drm_ioctl+0x2d8
devfs_ioctl_f(c91cb850,8020645d,ca827120,c91b5e80,ca85c8a0,...) at 
devfs_ioctl_f+0x10a
kern_ioctl(ca85c8a0,4,8020645d,ca827120,a62ccc,...) at kern_ioctl+0x2a0
sys_ioctl(ca85c8a0,efa62ccc,c67c4c80,293d3b4e,1,...) at sys_ioctl+0x134
syscall(efa62d08) at syscall+0x34a
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (54, FreeBSD ELF32, sys_ioctl), eip = 0x293d5b93, esp = 
0xbfbf7f4c, ebp = 0xbfbf7f68 ---

I tried to increase vm.kmem_size and vm.kmem_size_max to 512M, but the 
problem persists.

Any easy idea or workaround?
In the meanwhile, I'll try to investigate this problem deeper.

Thanks in advance,
Luca

PS I compiled apitrace (https://github.com/apitrace/apitrace) on FreeBSD 
and it works! Ok, a couple of patch and fix to build it correctly, but 
it works. It was developed by intel as an easy way to have repeatable 
openGL test cases.