Re: [PATCH v9 1/3] i915/gvt: Separate the MMIO tracking table from GVT-g

From: Alex Williamson
Date: Mon Aug 08 2022 - 16:27:27 EST

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On Thu, 7 Apr 2022 03:19:43 -0400
Zhi Wang <zhi.wang.linux@xxxxxxxxx> wrote:

> From: Zhi Wang <zhi.a.wang@xxxxxxxxx>
>
> To support the new mdev interfaces and the re-factor patches from
> Christoph, which moves the GVT-g code into a dedicated module, the GVT-g
> MMIO tracking table needs to be separated from GVT-g.
>

Since this commit I'm unable to make use of GVT-g on a Xeon W-1290 IGD.
The following in dmesg is the first sign of trouble:

------------[ cut here ]------------
assign a handler to a non-tracked mmio 4ab8
WARNING: CPU: 16 PID: 504 at drivers/gpu/drm/i915/gvt/handlers.c:123 setup_mmio_info.constprop.0+0xd1/0xf0 [i915]
ixgbe 0000:02:00.0: 31.504 Gb/s available PCIe bandwidth (8.0 GT/s PCIe x4 link)
Modules linked in: nouveau(+) i915(+) mdev vfio_iommu_type1 vfio prime_numbers intel_gtt ast drm_buddy mxm_wmi drm_dp_helper drm_vram_helper drm_ttm_helper drm_kms_helper sd_mod t10_pi syscopyarea sysfillrect sysimgblt sg fb_sys_fops cec ttm crct10dif_pclmul drm ixgbe(+) crc32_pclmul igb crc32c_intel ahci e1000e libahci mdio libata ghash_clmulni_intel i2c_algo_bit dca wmi video pinctrl_cannonlake rndis_host cdc_ether usbnet mii dm_mirror dm_region_hash dm_log dm_mod fuse
ixgbe 0000:02:00.0: MAC: 4, PHY: 0, PBA No: 020C08-0F8
CPU: 16 PID: 504 Comm: systemd-udevd Not tainted 5.18.0-rc1+ #16
ixgbe 0000:02:00.0: 3c:ec:ef:27:ef:0e
Hardware name: Supermicro Super Server/X12SCZ-F, BIOS 1.0 06/16/2020
RIP: 0010:setup_mmio_info.constprop.0+0xd1/0xf0 [i915]
Code: 83 c6 04 81 ef e4 e6 dd 78 39 f5 77 a2 31 c0 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 c7 c7 d8 c1 07 c1 e8 fe 83 cc c9 <0f> 0b 48 83 c4 08 b8 ed ff ff ff 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 0018:ffffa2014090fa28 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff934754a38000 RCX: 0000000000000000
RDX: ffff9346ce42c740 RSI: ffff9346ce41fca0 RDI: ffff9346ce41fca0
RBP: 0000000000004abc R08: 0000000000000000 R09: 00000000ffff7fff
R10: ffffa2014090f868 R11: ffffffff8bfe65e8 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000
FS: 00007f345634d540(0000) GS:ffff9346ce400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562eacfa8980 CR3: 0000002058ac0001 CR4: 00000000007706e0
PKRU: 55555554
Call Trace:
<TASK>
init_skl_mmio_info+0x1532/0x15a0 [i915]
intel_gvt_setup_mmio_info+0x1aa/0x240 [i915]
? gen9_dbuf_ctl_mmio_write+0x40/0x40 [i915]
intel_gvt_init_device+0x106/0x300 [i915]
intel_gvt_init+0x41/0xa0 [i915]
i915_driver_hw_probe+0x2b2/0x340 [i915]
i915_driver_probe+0x1fd/0x570 [i915]
? drm_privacy_screen_get+0x15f/0x190 [drm]
i915_pci_probe+0x56/0x1e0 [i915]
local_pci_probe+0x42/0x80
pci_call_probe+0x56/0x160
pci_device_probe+0x75/0xf0
? driver_sysfs_add+0x6f/0xd0
really_probe+0x199/0x380
ixgbe 0000:02:00.0: Intel(R) 10 Gigabit Network Connection
__driver_probe_device+0xfe/0x180
driver_probe_device+0x1e/0x90
__driver_attach+0xc0/0x1c0
? __device_attach_driver+0xe0/0xe0
? __device_attach_driver+0xe0/0xe0
bus_for_each_dev+0x75/0xc0
bus_add_driver+0x149/0x1e0
driver_register+0x8f/0xe0
i915_init+0x1d/0x7c [i915]
? 0xffffffffc0768000
do_one_initcall+0x41/0x200
? kmem_cache_alloc_trace+0x174/0x2f0
do_init_module+0x4c/0x250
__do_sys_finit_module+0xb4/0x120
do_syscall_64+0x59/0x80
? syscall_exit_to_user_mode+0x12/0x30
? do_syscall_64+0x69/0x80
? do_syscall_64+0x69/0x80
? do_syscall_64+0x69/0x80
? sysvec_call_function+0x3c/0x90
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3456e5a3ed
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 03 aa 1b 00 f7 d8 64 89 01 48
RSP: 002b:00007fff4df686b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 0000562eacf62920 RCX: 00007f3456e5a3ed
RDX: 0000000000000000 RSI: 0000562eacf886b0 RDI: 000000000000001a
RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000002
R10: 000000000000001a R11: 0000000000000246 R12: 0000562eacf886b0
R13: 0000562eacf627c0 R14: 0000000000000000 R15: 0000562eacf8d2d0
</TASK>
---[ end trace 0000000000000000 ]---

> diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
> index 520a7e1942f3..9bd3c15bfab6 100644
> --- a/drivers/gpu/drm/i915/gvt/handlers.c
> +++ b/drivers/gpu/drm/i915/gvt/handlers.c
...
> @@ -3440,7 +2729,6 @@ static int init_skl_mmio_info(struct intel_gvt *gvt)
> NULL, NULL);
>
> MMIO_DFH(GAMT_CHKN_BIT_REG, D_KBL | D_CFL, F_CMD_ACCESS, NULL, NULL);
> - MMIO_D(GEN9_CTX_PREEMPT_REG, D_SKL_PLUS & ~D_BXT);
> MMIO_DFH(_MMIO(0xe4cc), D_BDW_PLUS, F_CMD_ACCESS, NULL, NULL);
>
> return 0;

I tracked this to the above code segment, where the untouched line
provides this mmio address:

#define GAMT_CHKN_BIT_REG _MMIO(0x4ab8)

If I comment out setup of this register, GVT-g appears to initialize
and I can list available mdev types. I haven't tried assignment of the
resulting device to a VM yet. I do however get lots of spew about
unclaimed reads:

i915 0000:00:02.0: Unclaimed read from register 0x7257c
i915 0000:00:02.0: Unclaimed read from register 0x60110
i915 0000:00:02.0: Unclaimed read from register 0x6f03c
i915 0000:00:02.0: Unclaimed read from register 0x6003c
i915 0000:00:02.0: Unclaimed read from register 0x61038
i915 0000:00:02.0: Unclaimed read from register 0x45104
i915 0000:00:02.0: Unclaimed read from register 0x70428
i915 0000:00:02.0: Unclaimed read from register 0x68884
i915 0000:00:02.0: Unclaimed read from register 0x7f040
i915 0000:00:02.0: Unclaimed read from register 0x4510c
i915 0000:00:02.0: Unclaimed read from register 0x6203c
i915 0000:00:02.0: Unclaimed read from register 0x70430
i915 0000:00:02.0: Unclaimed read from register 0x704c0
i915 0000:00:02.0: Unclaimed read from register 0x7142c
i915 0000:00:02.0: Unclaimed read from register 0x72428
i915 0000:00:02.0: Unclaimed read from register 0x6f04c
i915 0000:00:02.0: Unclaimed read from register 0x6004c
i915 0000:00:02.0: Unclaimed read from register 0x61048
i915 0000:00:02.0: Unclaimed read from register 0x68070
i915 0000:00:02.0: Unclaimed read from register 0x71284
i915 0000:00:02.0: Unclaimed read from register 0x70438
i915 0000:00:02.0: Unclaimed read from register 0x71434
i915 0000:00:02.0: Unclaimed read from register 0x714c4
i915 0000:00:02.0: Unclaimed read from register 0x72430
i915 0000:00:02.0: Unclaimed read from register 0x724c0
i915 0000:00:02.0: Unclaimed read from register 0x6204c
i915 0000:00:02.0: Unclaimed read from register 0x69074
i915 0000:00:02.0: Unclaimed read from register 0x64044
i915 0000:00:02.0: Unclaimed read from register 0x7143c
i915 0000:00:02.0: Unclaimed read from register 0x72438
i915 0000:00:02.0: Unclaimed read from register 0x46508
i915 0000:00:02.0: Unclaimed read from register 0x69270
i915 0000:00:02.0: Unclaimed read from register 0x45124
i915 0000:00:02.0: Unclaimed read from register 0x68080
i915 0000:00:02.0: Unclaimed read from register 0x61208
i915 0000:00:02.0: Unclaimed read from register 0x45200
i915 0000:00:02.0: Unclaimed read from register 0x69084
i915 0000:00:02.0: Unclaimed read from register 0x6f020
i915 0000:00:02.0: Unclaimed read from register 0x60020
i915 0000:00:02.0: Unclaimed read from register 0x42020
i915 0000:00:02.0: Unclaimed read from register 0x69280
i915 0000:00:02.0: Unclaimed read from register 0x71184
i915 0000:00:02.0: Unclaimed read from register 0x68090
i915 0000:00:02.0: Unclaimed read from register 0x7f024
i915 0000:00:02.0: Unclaimed read from register 0x70024
i915 0000:00:02.0: Unclaimed read from register 0x70578
i915 0000:00:02.0: Unclaimed read from register 0x43218
i915 0000:00:02.0: Unclaimed read from register 0x62020
i915 0000:00:02.0: Unclaimed read from register 0x68870
i915 0000:00:02.0: Unclaimed read from register 0x7157c
i915 0000:00:02.0: Unclaimed read from register 0x72024
i915 0000:00:02.0: Unclaimed read from register 0x72578
i915 0000:00:02.0: Unclaimed read from register 0x46020
i915 0000:00:02.0: Unclaimed read from register 0x6f038
i915 0000:00:02.0: Unclaimed read from register 0x60038
i915 0000:00:02.0: Unclaimed read from register 0x45100
i915 0000:00:02.0: Unclaimed read from register 0x44030
i915 0000:00:02.0: Unclaimed read from register 0x68880
i915 0000:00:02.0: Unclaimed read from register 0x61110
i915 0000:00:02.0: Unclaimed read from register 0x6103c
i915 0000:00:02.0: Unclaimed read from register 0x45108
i915 0000:00:02.0: Unclaimed read from register 0x62038
i915 0000:00:02.0: Unclaimed read from register 0x6e554
i915 0000:00:02.0: Unclaimed read from register 0x7042c
i915 0000:00:02.0: Unclaimed read from register 0x71428
i915 0000:00:02.0: Unclaimed read from register 0x48800
i915 0000:00:02.0: Unclaimed read from register 0x7f044
i915 0000:00:02.0: Unclaimed read from register 0x6f048
i915 0000:00:02.0: Unclaimed read from register 0x60048
i915 0000:00:02.0: Unclaimed read from register 0x48268
i915 0000:00:02.0: Unclaimed read from register 0x45110
i915 0000:00:02.0: Unclaimed read from register 0x70284
i915 0000:00:02.0: Unclaimed read from register 0x7f000
i915 0000:00:02.0: Unclaimed read from register 0x70434
i915 0000:00:02.0: Unclaimed read from register 0x704c4
i915 0000:00:02.0: Unclaimed read from register 0x71430
i915 0000:00:02.0: Unclaimed read from register 0x714c0
i915 0000:00:02.0: Unclaimed read from register 0x44040
i915 0000:00:02.0: Unclaimed read from register 0x7242c
i915 0000:00:02.0: Unclaimed read from register 0x68890
i915 0000:00:02.0: Unclaimed read from register 0x42004
i915 0000:00:02.0: Unclaimed read from register 0x6104c
i915 0000:00:02.0: Unclaimed read from register 0x62048
i915 0000:00:02.0: Unclaimed read from register 0x68074
i915 0000:00:02.0: Unclaimed read from register 0x69070
i915 0000:00:02.0: Unclaimed read from register 0x7043c
i915 0000:00:02.0: Unclaimed read from register 0x72284
i915 0000:00:02.0: Unclaimed read from register 0x71438
i915 0000:00:02.0: Unclaimed read from register 0x72434
i915 0000:00:02.0: Unclaimed read from register 0x724c4
i915 0000:00:02.0: Unclaimed read from register 0x45120
i915 0000:00:02.0: Unclaimed read from register 0x7243c
i915 0000:00:02.0: Unclaimed read from register 0x42014
i915 0000:00:02.0: Unclaimed read from register 0x69274
i915 0000:00:02.0: Unclaimed read from register 0x45128
i915 0000:00:02.0: Unclaimed read from register 0x68084
i915 0000:00:02.0: Unclaimed read from register 0x6120c
i915 0000:00:02.0: Unclaimed read from register 0x69080
i915 0000:00:02.0: Unclaimed read from register 0x70184
i915 0000:00:02.0: Unclaimed read from register 0x43408
i915 0000:00:02.0: Unclaimed read from register 0x61020
i915 0000:00:02.0: Unclaimed read from register 0x72184
i915 0000:00:02.0: Unclaimed read from register 0x69090
i915 0000:00:02.0: Unclaimed read from register 0x7057c
i915 0000:00:02.0: Unclaimed read from register 0x71024
i915 0000:00:02.0: Unclaimed read from register 0x71578
i915 0000:00:02.0: Unclaimed read from register 0x68874

This looks like a regression in v5.19 to me. Thanks,

Alex

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