eaf9954929
[ Upstream commit cabe13d0bd2efb8dd50ed2310f57b33e1a69a0d4 ]
In previous capability register implementation, qm irq related values
were read from capability registers dynamically when needed. But in
abnormal scenario, e.g. the core is timeout and the device needs to
soft reset and reset failed after disabling the MSE, the device can
not be removed normally, causing the following call trace:
| Call trace:
| pci_irq_vector+0xfc/0x140
| hisi_qm_uninit+0x278/0x3b0 [hisi_qm]
| hpre_remove+0x16c/0x1c0 [hisi_hpre]
| pci_device_remove+0x6c/0x264
| device_release_driver_internal+0x1ec/0x3e0
| device_release_driver+0x3c/0x60
| pci_stop_bus_device+0xfc/0x22c
| pci_stop_and_remove_bus_device+0x38/0x70
| pci_iov_remove_virtfn+0x108/0x1c0
| sriov_disable+0x7c/0x1e4
| pci_disable_sriov+0x4c/0x6c
| hisi_qm_sriov_disable+0x90/0x160 [hisi_qm]
| hpre_remove+0x1a8/0x1c0 [hisi_hpre]
| pci_device_remove+0x6c/0x264
| device_release_driver_internal+0x1ec/0x3e0
| driver_detach+0x168/0x2d0
| bus_remove_driver+0xc0/0x230
| driver_unregister+0x58/0xdc
| pci_unregister_driver+0x40/0x220
| hpre_exit+0x34/0x64 [hisi_hpre]
| __arm64_sys_delete_module+0x374/0x620
[...]
| Call trace:
| free_msi_irqs+0x25c/0x300
| pci_disable_msi+0x19c/0x264
| pci_free_irq_vectors+0x4c/0x70
| hisi_qm_pci_uninit+0x44/0x90 [hisi_qm]
| hisi_qm_uninit+0x28c/0x3b0 [hisi_qm]
| hpre_remove+0x16c/0x1c0 [hisi_hpre]
| pci_device_remove+0x6c/0x264
[...]
The reason for this call trace is that when the MSE is disabled, the value
of capability registers in the BAR space become invalid. This will make the
subsequent unregister process get the wrong irq vector through capability
registers and get the wrong irq number by pci_irq_vector().
So add a capability table structure to pre-store the valid value of the irq
information capability register in qm init process, avoid obtaining invalid
capability register value after the MSE is disabled.
Fixes: 3536cc55cada ("crypto: hisilicon/qm - support get device irq information from hardware registers")
Signed-off-by: Zhiqi Song <songzhiqi1@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
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