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Date:   Wed, 30 Dec 2020 18:28:23 +0100
From:   Michael Walle <michael@...le.cc>
To:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH] PCI: add Intel i210 quirk

The Intel i210 doesn't work if the Expansion ROM BAR overlaps with
another BAR. Networking won't work at all and once a packet is sent the
netdev watchdog will bite:

[   89.059374] ------------[ cut here ]------------
[   89.064019] NETDEV WATCHDOG: enP2p1s0 (igb): transmit queue 0 timed out
[   89.070681] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:443 dev_watchdog+0x3a8/0x3b0
[   89.078989] Modules linked in:
[   89.082053] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W         5.11.0-rc1-00020-gc16f033804b #289
[   89.091574] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT)
[   89.099870] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
[   89.105900] pc : dev_watchdog+0x3a8/0x3b0
[   89.109923] lr : dev_watchdog+0x3a8/0x3b0
[   89.113945] sp : ffff80001000bd50
[   89.117268] x29: ffff80001000bd50 x28: 0000000000000008
[   89.122602] x27: 0000000000000004 x26: 0000000000000140
[   89.127935] x25: ffff002001c6c000 x24: ffff002001c2b940
[   89.133267] x23: ffff8000118c7000 x22: ffff002001c6c39c
[   89.138600] x21: ffff002001c6bfb8 x20: ffff002001c6c3b8
[   89.143932] x19: 0000000000000000 x18: 0000000000000010
[   89.149264] x17: 0000000000000000 x16: 0000000000000000
[   89.154596] x15: ffffffffffffffff x14: 0720072007200720
[   89.159928] x13: 0720072007740775 x12: ffff80001195b980
[   89.165260] x11: 0000000000000003 x10: ffff800011943940
[   89.170592] x9 : ffff800010100d44 x8 : 0000000000017fe8
[   89.175924] x7 : c0000000ffffefff x6 : 0000000000000001
[   89.181255] x5 : 0000000000000000 x4 : 0000000000000000
[   89.186587] x3 : 00000000ffffffff x2 : ffff8000118eb908
[   89.191919] x1 : 84d8200845006900 x0 : 0000000000000000
[   89.197251] Call trace:
[   89.199701]  dev_watchdog+0x3a8/0x3b0
[   89.203374]  call_timer_fn+0x38/0x208
[   89.207049]  run_timer_softirq+0x290/0x540
[   89.211158]  __do_softirq+0x138/0x404
[   89.214831]  irq_exit+0xe8/0xf8
[   89.217981]  __handle_domain_irq+0x70/0xc8
[   89.222091]  gic_handle_irq+0xc8/0x2b0
[   89.225850]  el1_irq+0xb8/0x180
[   89.228999]  arch_cpu_idle+0x18/0x40
[   89.232587]  default_idle_call+0x70/0x214
[   89.236610]  do_idle+0x21c/0x290
[   89.239848]  cpu_startup_entry+0x2c/0x70
[   89.243783]  secondary_start_kernel+0x1a0/0x1f0
[   89.248332] ---[ end trace 1687af62576397bc ]---
[   89.253350] igb 0002:01:00.0 enP2p1s0: Reset adapter

Before this fixup the Expansion ROM BAR will overlap with BAR3:
  # lspci -ns 2:1:0 -xx
  0002:01:00.0 0200: 8086:1533 (rev 03)
  00: 86 80 33 15 06 04 10 00 03 00 00 02 08 00 00 00
  10: 00 00 00 40 00 00 00 00 00 00 00 00 00 00 20 40
  20: 00 00 00 00 00 00 00 00 00 00 00 00 3c 10 03 00
  30: 00 00 20 40 40 00 00 00 00 00 00 00 22 01 00 00

Add a quirk which will update the Expansion ROM BAR for Intel i210s even
if the ROM is disabled. This was tested on an ARM64 board (kontron
sl28).

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/pci/quirks.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 653660e3ba9e..59c204ef5df7 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5612,3 +5612,37 @@ static void apex_pci_fixup_class(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_CLASS_HEADER(0x1ac1, 0x089a,
 			       PCI_CLASS_NOT_DEFINED, 8, apex_pci_fixup_class);
+
+/*
+ * Some devices doesn't work if the Expansion ROM has the same base address as
+ * one of the other BARs although it is disabled.
+ * This might happen if the bootloader/BIOS enumerate the BARs in a different
+ * way than linux. If the Expansion ROM is disabled, linux deliberately skip
+ * writing the ROM BAR if the BAR is not enabled because of some broken
+ * devices, see pci_std_update_resource(). Thus, the ROM BAR of the device will
+ * still contain the value assigned by the booloader, which might be the same
+ * value as one of the other BARs then.
+ *
+ * As a workaround, update the Expansion ROM BAR even if the Expansion ROM is
+ * disabled.
+ */
+static void pci_fixup_rewrite_rom_bar(struct pci_dev *dev)
+{
+	struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
+	struct pci_bus_region region;
+	u32 rom_addr;
+
+	pci_read_config_dword(dev, dev->rom_base_reg, &rom_addr);
+
+	if (rom_addr & PCI_ROM_ADDRESS_ENABLE)
+		return;
+
+	pcibios_resource_to_bus(dev->bus, &region, res);
+	rom_addr &= ~PCI_ROM_ADDRESS_MASK;
+	rom_addr |= region.start;
+	pci_write_config_dword(dev, dev->rom_base_reg, rom_addr);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1533, pci_fixup_rewrite_rom_bar);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1536, pci_fixup_rewrite_rom_bar);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1537, pci_fixup_rewrite_rom_bar);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x1538, pci_fixup_rewrite_rom_bar);
-- 
2.20.1

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