On 8/20/25 14:19, Bernhard Beschow wrote:
This series fixes the Designware PCIe host to work with cards other than
virio-net-pci, e.g. e1000. It was tested on the imx8mp-evk machine.
The series is structured as follows: The first part refactors the device
model to create memory regions for inbound/outbound PCI mappings on demand
rather than upfront since this approach doesn't scale for adding I/O space
support. The second part consists of fixing the memory mapping by adding I/O
space support and fixing default inbound viewport mapping. The third part
concludes the series by implementing device reset and cleaning up the imx8mp SoC
implementation.
Testing done:
* Boot imx8mp-evk machine with Buildroot while having an e1000 card attached.
Observe that it gets an IP address via DHCP and allows for downloading an HTML
file via HTTP.
Crashing for me even if no PCIe card is attached. This is with the series
applied
on top of 10.1.0-rc4 or 10.0.3. I have not tried to track down the problem.
Guenter
---
Build reference: v6.17-rc1-287-g685de850cabf
Compiler version: aarch64-linux-gcc (GCC) 13.4.0
Qemu version: 10.0.94 (v10.1.0-rc4-55-g320ed12bd9)
[ 7.748393] Internal error: synchronous external abort: 0000000096000010
[#1] SMP
[ 7.748917] Modules linked in:
[ 7.749533] CPU: 3 UID: 0 PID: 12 Comm: kworker/u16:0 Tainted: G M
N 6.17.0-rc2-g685de850cabf #1 PREEMPT
[ 7.749689] Tainted: [M]=MACHINE_CHECK, [N]=TEST
[ 7.749745] Hardware name: NXP i.MX8MPlus EVK board (DT)
[ 7.750118] ok 1 block_bits=10 cluster_bits=3 blocks_per_group=8192
group_count=4 desc_size=64
[ 7.749922] Workqueue: async async_run_entry_fn
[ 7.751174] pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 7.751267] pc : pci_generic_config_read+0x38/0xb8
[ 7.751370] lr : pci_generic_config_read+0x24/0xb8
[ 7.751474] sp : ffff8000845fb730
[ 7.751532] x29: ffff8000845fb730 x28: 00000000000000ff x27: 0000000000000000
[ 7.751686] x26: 0000000000000001 x25: ffff80008290c008 x24: ffff8000832cbe80
[ 7.751770] x23: 0000000000000000 x22: ffff8000845fb844 x21: ffff000008a73800
[ 7.751859] x20: ffff8000845fb7a4 x19: 0000000000000004 x18: 00000000ffffffff
[ 7.751942] x17: ffff800080e2f918 x16: ffff800080e2f7ac x15: ffff800080e2e6d8
[ 7.752027] x14: 0000000000000000 x13: 0000000000000000 x12: ffff80008427cab8
[ 7.752120] x11: 0000000000000326 x10: 0000000000000326 x9 : 00000000000c0326
[ 7.752225] x8 : 000000006973b6c5 x7 : ffff800085c00000 x6 : 0000000000000000
[ 7.752320] x5 : ffff000007cc5080 x4 : 0000000000000000 x3 : 0000000000000000
[ 7.752403] x2 : 0000000000000000 x1 : ffff000004bf5680 x0 : ffff800085900000
[ 7.752577] Call trace:
[ 7.752694] pci_generic_config_read+0x38/0xb8 (P)
[ 7.752794] dw_pcie_rd_other_conf+0x38/0xb0
[ 7.752851] pci_bus_read_config_dword+0x80/0xe4
[ 7.752903] pci_bus_generic_read_dev_vendor_id+0x30/0x190
[ 7.752964] pci_scan_device+0xdc/0x184
[ 7.753010] pci_scan_slot+0xe0/0x23c
[ 7.753056] pci_scan_child_bus_extend+0x44/0x2cc
[ 7.753110] pci_scan_bridge_extend+0x514/0x598
[ 7.753166] pci_scan_child_bus_extend+0x104/0x2cc
[ 7.753220] pci_scan_root_bus_bridge+0x64/0xd8
[ 7.753273] pci_host_probe+0x34/0x10c
[ 7.753328] dw_pcie_host_init+0x2f0/0x4b0
[ 7.753376] imx_pcie_probe+0x33c/0x70c
[ 7.753439] platform_probe+0x5c/0x9c
[ 7.753485] really_probe+0xc0/0x390
[ 7.753530] __driver_probe_device+0x7c/0x15c
[ 7.753581] driver_probe_device+0x3c/0x110
[ 7.753633] __device_attach_driver+0xbc/0x158
