[PATCH v2] drm/i915/gem: Downgrade stolen lmem setup warning

[Andi Shyti]

Hi Jonathan,

On Mon, Apr 22, 2024 at 06:59:59AM -0700, Jonathan Cavitt wrote:
> In the case where lmem_size < dsm_base, hardware is reporting that
> stolen lmem is unusable.  In this case, instead of throwing a warning,
> we can continue execution as normal by disabling stolen LMEM support.
> For example, this change will allow the following error report from
> ATS-M to no longer apply:
> 
> <6> [144.859887] pcieport 0000:4b:00.0: bridge window [mem 0xb1000000-0xb11fffff]
> <6> [144.859900] pcieport 0000:4b:00.0: bridge window [mem 0x3bbc00000000-0x3bbc17ffffff 64bit pref]
> <6> [144.859917] pcieport 0000:4c:01.0: PCI bridge to [bus 4d-4e]
> <6> [144.859932] pcieport 0000:4c:01.0: bridge window [mem 0xb1000000-0xb11fffff]
> <6> [144.859945] pcieport 0000:4c:01.0: bridge window [mem 0x3bbc00000000-0x3bbc17ffffff 64bit pref]
> <6> [144.859984] i915 0000:4d:00.0: [drm] BAR2 resized to 256M
> <6> [144.860640] i915 0000:4d:00.0: [drm] Using a reduced BAR size of 256MiB. Consider enabling 'Resizable BAR' or similar, if available in the BIOS.
> <4> [144.860719] -----------[ cut here ]-----------
> <4> [144.860727] WARNING: CPU: 17 PID: 1815 at drivers/gpu/drm/i915/gem/i915_gem_stolen.c:939 i915_gem_stolen_lmem_setup+0x38c/0x430 [i915]
> <4> [144.861430] Modules linked in: i915 snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core snd_pcm vgem drm_shmem_helper prime_numbers i2c_algo_bit ttm video drm_display_helper drm_buddy fuse x86_pkg_temp_thermal coretemp kvm_intel kvm ixgbe mdio irqbypass ptp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pps_core i2c_i801 mei_me i2c_smbus mei wmi acpi_power_meter [last unloaded: i915]
> <4> [144.861611] CPU: 17 PID: 1815 Comm: i915_module_loa Tainted: G U 6.8.0-rc5-drmtip_1515-g78f49af27723+ #1
> <4> [144.861624] Hardware name: Intel Corporation WHITLEY/WHITLEY, BIOS SE5C6200.86B.0020.P41.2109300305 09/30/2021
> <4> [144.861632] RIP: 0010:i915_gem_stolen_lmem_setup+0x38c/0x430 [i915]
> <4> [144.862287] Code: ff 41 c1 e4 05 e9 ac fe ff ff 4d 63 e4 48 89 ef 48 85 ed 74 04 48 8b 7d 08 48 c7 c6 10 a3 7b a0 e8 e9 90 43 e1 e9 ee fd ff ff <0f> 0b 49 c7 c4 ed ff ff ff e9 e0 fd ff ff 0f b7 d2 48 c7 c6 00 d9
> <4> [144.862299] RSP: 0018:ffffc90005607980 EFLAGS: 00010207
> <4> [144.862315] RAX: fffffffffff00000 RBX: 0000000000000003 RCX: 0000000000000000
> 
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/10833
> Suggested-by: Chris Wilson <chris.p.wilson at linux.intel.com>
> Signed-off-by: Jonathan Cavitt <jonathan.cavitt at intel.com>

Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>

Thanks,
Andi