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SubjectRe: [PATCH] iommu/intel: Use fallback generic_device_group() for ACPI devices
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Hi Chris,

Just a quick scan of the dmesg attached in the bugzilla.

There are 6 devices reported in ANDD.

[ 0.458662] DMAR: ANDD device: 1 name: \_SB.PCI0.I2C0
[ 0.458683] DMAR: ANDD device: 2 name: \_SB.PCI0.I2C1
[ 0.458704] DMAR: ANDD device: 3 name: \_SB.PCI0.SPI0
[ 0.458724] DMAR: ANDD device: 4 name: \_SB.PCI0.SPI1
[ 0.458745] DMAR: ANDD device: 6 name: \_SB.PCI0.UA01
[ 0.458766] DMAR: ANDD device: 7 name: \_SB.PCI0.SDHC

On 10/5/19 4:55 AM, Chris Wilson wrote:
> [ 2.073922] DMAR: ACPI device "INT33C2:00" under DMAR at fed91000 as 00:15.1
> [ 2.073983] DMAR: ACPI device "INT33C3:00" under DMAR at fed91000 as 00:15.2
> [ 2.074027] DMAR: ACPI device "INT33C0:00" under DMAR at fed91000 as 00:15.3
> [ 2.074072] DMAR: ACPI device "INT33C1:00" under DMAR at fed91000 as 00:15.4

Four of them have been mapped to pci devices with device# 15:

> [ 2.074114] DMAR: Failed to find handle for ACPI object \_SB.PCI0.UA01
> [ 2.074156] DMAR: Failed to find handle for ACPI object \_SB.PCI0.SDHC

And 2 failed to be probed due to lack of ACPI objects.

> [ 2.074208] DMAR: No ATSR found
> [ 2.074572] DMAR: dmar0: Using Queued invalidation
> [ 2.074629] DMAR: dmar1: Using Queued invalidation
> [ 2.110029] pci 0000:00:00.0: Adding to iommu group 0
> [ 2.115703] pci 0000:00:02.0: Adding to iommu group 1
> [ 2.116221] pci 0000:00:03.0: Adding to iommu group 2
> [ 2.116759] pci 0000:00:14.0: Adding to iommu group 3
> [ 2.117276] pci 0000:00:16.0: Adding to iommu group 4
> [ 2.117762] pci 0000:00:1b.0: Adding to iommu group 5
> [ 2.118264] pci 0000:00:1c.0: Adding to iommu group 6
> [ 2.118733] pci 0000:00:1c.2: Adding to iommu group 7
> [ 2.119289] pci 0000:00:1d.0: Adding to iommu group 8
> [ 2.119846] pci 0000:00:1f.0: Adding to iommu group 9
> [ 2.119960] pci 0000:00:1f.2: Adding to iommu group 9
> [ 2.120073] pci 0000:00:1f.3: Adding to iommu group 9
> [ 2.120549] pci 0000:06:00.0: Adding to iommu group 10

IOMMU pci bus scan didn't see pci devices with device# 15.

Are these hidden devices? Do you mind posting the output of lspci
command? With this fix, do these devices work well?

Best regards,
baolu

> [ 2.120631] ------------[ cut here ]------------
> [ 2.120681] WARNING: CPU: 2 PID: 1 at drivers/iommu/iommu.c:1275 pci_device_group+0x109/0x120
> [ 2.120723] Modules linked in:
> [ 2.120744] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc1-CI-CI_DRM_7000+ #1
> [ 2.120782] Hardware name: Dell Inc. XPS 12-9Q33/XPS 12-9Q33, BIOS A04 12/03/2013
> [ 2.120821] RIP: 0010:pci_device_group+0x109/0x120
> [ 2.120848] Code: e9 ff ff 48 85 c0 48 89 c5 75 bd 48 8d 74 24 10 4c 89 e7 e8 49 ea ff ff 48 85 c0 48 89 c5 75 a8 e8 fc ee ff ff 48 89 c5 eb 9e <0f> 0b 48 c7 c5 ea ff ff ff eb 93 e8 37 5f a7 ff 0f 1f 80 00 00 00
> [ 2.120933] RSP: 0000:ffffc90000037cd0 EFLAGS: 00010202
> [ 2.120961] RAX: ffffffff81639810 RBX: ffffffffffffffea RCX: 0000000000000000
> [ 2.120996] RDX: 0000000000000000 RSI: 00000000403efd19 RDI: ffff888119999c08
> [ 2.121031] RBP: ffff888119999c08 R08: ffff88811a5188f8 R09: 00000000fffffffe
> [ 2.121066] R10: 00000000ca7d066a R11: 000000002161dc90 R12: ffff888118320a58
> [ 2.121100] R13: ffff888119fc1e50 R14: 0000000000000001 R15: ffff888119fc2300
> [ 2.121136] FS: 0000000000000000(0000) GS:ffff88811b900000(0000) knlGS:0000000000000000
> [ 2.121176] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 2.121205] CR2: 0000000000000000 CR3: 0000000005210001 CR4: 00000000001606e0
> [ 2.121240] Call Trace:
> [ 2.121264] iommu_group_get_for_dev+0x77/0x210
> [ 2.121295] intel_iommu_add_device+0x54/0x1c0
> [ 2.121323] iommu_probe_device+0x43/0xc0
> [ 2.121350] intel_iommu_init+0x11fb/0x12c9
> [ 2.121383] ? set_debug_rodata+0xc/0xc
> [ 2.121410] ? set_debug_rodata+0xc/0xc
> [ 2.121434] ? e820__memblock_setup+0x5b/0x5b
> [ 2.121458] ? pci_iommu_init+0x11/0x3a
> [ 2.121471] ? rcu_read_lock_sched_held+0x4d/0x80
> [ 2.121471] pci_iommu_init+0x11/0x3a
> [ 2.121471] do_one_initcall+0x58/0x2ff
> [ 2.121471] ? set_debug_rodata+0xc/0xc
> [ 2.121471] ? rcu_read_lock_sched_held+0x4d/0x80
> [ 2.121471] kernel_init_freeable+0x137/0x1c7
> [ 2.121471] ? rest_init+0x250/0x250
> [ 2.121471] kernel_init+0x5/0x100
> [ 2.121471] ret_from_fork+0x3a/0x50
> [ 2.121471] irq event stamp: 1252438
> [ 2.121471] hardirqs last enabled at (1252437): [<ffffffff8123f4ed>] __slab_alloc.isra.84.constprop.89+0x4d/0x70
> [ 2.121471] hardirqs last disabled at (1252438): [<ffffffff81001bba>] trace_hardirqs_off_thunk+0x1a/0x20
> [ 2.121471] softirqs last enabled at (1252382): [<ffffffff81c00385>] __do_softirq+0x385/0x47f
> [ 2.121471] softirqs last disabled at (1252375): [<ffffffff810b7f4a>] irq_exit+0xba/0xc0
> [ 2.121471] ---[ end trace 610717c918cf08f3 ]---
> [ 2.121974] DMAR: ACPI name space devices didn't probe correctly
> [ 2.122069] DMAR: Intel(R) Virtualization Technology for Directed I/O
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111906
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Joerg Roedel <joro@8bytes.org>
> ---
> Take the patch with a pinch of salt; it seems to be the pattern used by
> other iommu backends, but I don't know if it is even suitable for iommu
> and what appear to be ACPI devices rather than the expected PCI.
> ---
> drivers/iommu/intel-iommu.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index ed321b808176..e231be0d0534 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -5939,6 +5939,14 @@ static bool intel_iommu_is_attach_deferred(struct iommu_domain *domain,
> return dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO;
> }
>
> +static struct iommu_group *intel_iommu_device_group(struct device *dev)
> +{
> + if (dev_is_pci(dev))
> + return pci_device_group(dev);
> + else
> + return generic_device_group(dev);
> +}
> +
> const struct iommu_ops intel_iommu_ops = {
> .capable = intel_iommu_capable,
> .domain_alloc = intel_iommu_domain_alloc,
> @@ -5956,7 +5964,7 @@ const struct iommu_ops intel_iommu_ops = {
> .get_resv_regions = intel_iommu_get_resv_regions,
> .put_resv_regions = intel_iommu_put_resv_regions,
> .apply_resv_region = intel_iommu_apply_resv_region,
> - .device_group = pci_device_group,
> + .device_group = intel_iommu_device_group,
> .dev_has_feat = intel_iommu_dev_has_feat,
> .dev_feat_enabled = intel_iommu_dev_feat_enabled,
> .dev_enable_feat = intel_iommu_dev_enable_feat,
>

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