[PATCH 6.6 249/299] powerpc/pseries/iommu: DLPAR add doesnt completely initialize pci_controller

Greg Kroah-Hartman
2024-02-27T13:59:45Z

From: Gaurav Batra <gbatra@linux.ibm.com>

[ Upstream commit a5c57fd2e9bd1c8ea8613a8f94fd0be5eccbf321 ]

When a PCI device is dynamically added, the kernel oopses with a NULL
pointer dereference:

BUG: Kernel NULL pointer dereference on read at 0x00000030
Faulting instruction address: 0xc0000000006bbe5c
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
Modules linked in: rpadlpar_io rpaphp rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs xsk_diag bonding nft_compat nf_tables nfnetlink rfkill binfmt_misc dm_multipath rpcrdma sunrpc rdma_ucm ib_srpt ib_isert iscsi_target_mod target_core_mod ib_umad ib_iser libiscsi scsi_transport_iscsi ib_ipoib rdma_cm iw_cm ib_cm mlx5_ib ib_uverbs ib_core pseries_rng drm drm_panel_orientation_quirks xfs libcrc32c mlx5_core mlxfw sd_mod t10_pi sg tls ibmvscsi ibmveth scsi_transport_srp vmx_crypto pseries_wdt psample dm_mirror dm_region_hash dm_log dm_mod fuse
CPU: 17 PID: 2685 Comm: drmgr Not tainted 6.7.0-203405+ #66
Hardware name: IBM,9080-HEX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_008) hv:phyp pSeries
NIP: c0000000006bbe5c LR: c000000000a13e68 CTR: c0000000000579f8
REGS: c00000009924f240 TRAP: 0300 Not tainted (6.7.0-203405+)
MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 24002220 XER: 20040006
CFAR: c000000000a13e64 DAR: 0000000000000030 DSISR: 40000000 IRQMASK: 0
...
NIP sysfs_add_link_to_group+0x34/0x94
LR iommu_device_link+0x5c/0x118
Call Trace:
iommu_init_device+0x26c/0x318 (unreliable)
iommu_device_link+0x5c/0x118
iommu_init_device+0xa8/0x318
iommu_probe_device+0xc0/0x134
iommu_bus_notifier+0x44/0x104
notifier_call_chain+0xb8/0x19c
blocking_notifier_call_chain+0x64/0x98
bus_notify+0x50/0x7c
device_add+0x640/0x918
pci_device_add+0x23c/0x298
of_create_pci_dev+0x400/0x884
of_scan_pci_dev+0x124/0x1b0
__of_scan_bus+0x78/0x18c
pcibios_scan_phb+0x2a4/0x3b0
init_phb_dynamic+0xb8/0x110
dlpar_add_slot+0x170/0x3b8 [rpadlpar_io]
add_slot_store.part.0+0xb4/0x130 [rpadlpar_io]
kobj_attr_store+0x2c/0x48
sysfs_kf_write+0x64/0x78
kernfs_fop_write_iter+0x1b0/0x290
vfs_write+0x350/0x4a0
ksys_write+0x84/0x140
system_call_exception+0x124/0x330
system_call_vectored_common+0x15c/0x2ec

Commit a940904443e4 ("powerpc/iommu: Add iommu_ops to report capabilities
and allow blocking domains") broke DLPAR add of PCI devices.

The above added iommu_device structure to pci_controller. During
system boot, PCI devices are discovered and this newly added iommu_device
structure is initialized by a call to iommu_device_register().

During DLPAR add of a PCI device, a new pci_controller structure is
allocated but there are no calls made to iommu_device_register()
interface.

Fix is to register the iommu device during DLPAR add as well.

Fixes: a940904443e4 ("powerpc/iommu: Add iommu_ops to report capabilities and allow blocking domains")
Signed-off-by: Gaurav Batra <gbatra@linux.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240215221833.4817-1-gbatra@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/include/asm/ppc-pci.h | 10 ++++++++++
arch/powerpc/kernel/iommu.c | 23 ++++++++++++++++------
arch/powerpc/platforms/pseries/pci_dlpar.c | 4 ++++
3 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h
index d9fcff5750271..2689e7139b9ea 100644
--- a/arch/powerpc/include/asm/ppc-pci.h
+++ b/arch/powerpc/include/asm/ppc-pci.h
@@ -30,6 +30,16 @@ void *pci_traverse_device_nodes(struct device_node *start,
void *data);
extern void pci_devs_phb_init_dynamic(struct pci_controller *phb);

+#if defined(CONFIG_IOMMU_API) && (defined(CONFIG_PPC_PSERIES) || \
+ defined(CONFIG_PPC_POWERNV))
+extern void ppc_iommu_register_device(struct pci_controller *phb);
+extern void ppc_iommu_unregister_device(struct pci_controller *phb);
+#else
+static inline void ppc_iommu_register_device(struct pci_controller *phb) { }
+static inline void ppc_iommu_unregister_device(struct pci_controller *phb) { }
+#endif
+
+
/* From rtas_pci.h */
extern void init_pci_config_tokens (void);
extern unsigned long get_phb_buid (struct device_node *);
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 14251bc5219eb..efaca0c6eff9d 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1344,7 +1344,7 @@ static struct iommu_device *spapr_tce_iommu_probe_device(struct device *dev)
struct pci_controller *hose;

if (!dev_is_pci(dev))
- return ERR_PTR(-EPERM);
+ return ERR_PTR(-ENODEV);

pdev = to_pci_dev(dev);
hose = pdev->bus->sysdata;
@@ -1393,6 +1393,21 @@ static const struct attribute_group *spapr_tce_iommu_groups[] = {
NULL,
};

+void ppc_iommu_register_device(struct pci_controller *phb)
+{
+ iommu_device_sysfs_add(&phb->iommu, phb->parent,
+ spapr_tce_iommu_groups, "iommu-phb%04x",
+ phb->global_number);
+ iommu_device_register(&phb->iommu, &spapr_tce_iommu_ops,
+ phb->parent);
+}
+
+void ppc_iommu_unregister_device(struct pci_controller *phb)
+{
+ iommu_device_unregister(&phb->iommu);
+ iommu_device_sysfs_remove(&phb->iommu);
+}
+
/*
* This registers IOMMU devices of PHBs. This needs to happen
* after core_initcall(iommu_init) + postcore_initcall(pci_driver_init) and
@@ -1403,11 +1418,7 @@ static int __init spapr_tce_setup_phb_iommus_initcall(void)
struct pci_controller *hose;

list_for_each_entry(hose, &hose_list, list_node) {
- iommu_device_sysfs_add(&hose->iommu, hose->parent,
- spapr_tce_iommu_groups, "iommu-phb%04x",
- hose->global_number);
- iommu_device_register(&hose->iommu, &spapr_tce_iommu_ops,
- hose->parent);
+ ppc_iommu_register_device(hose);
}
return 0;
}
diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c
index 4ba8245681192..4448386268d99 100644
--- a/arch/powerpc/platforms/pseries/pci_dlpar.c
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -35,6 +35,8 @@ struct pci_controller *init_phb_dynamic(struct device_node *dn)

pseries_msi_allocate_domains(phb);

+ ppc_iommu_register_device(phb);
+
/* Create EEH devices for the PHB */
eeh_phb_pe_create(phb);

@@ -76,6 +78,8 @@ int remove_phb_dynamic(struct pci_controller *phb)
}
}

+ ppc_iommu_unregister_device(phb);
+
pseries_msi_free_domains(phb);

/* Keep a reference so phb isn't freed yet */
--
2.43.0