Disable MSI on Zhaoxin ZX-100/ZX-200/ZX-E StorX to unhang SSD

The Unchartevice 6640MA's BIOS forces one of three SATA speeds:
- Gen1/2: bsd.rd reaches installer, but SSD does not attach
- Gen3:   bsd.rd attaches SSD but hangs

MSI works for iwm(4) and and xhci(4), only ahci(4) bugs out, so add a quirk
for this controller as done for a few other devices already:

 ahci0 at pci0 dev 15 function 0 "Zhaoxin StorX AHCI" rev 0x01: apic 9 int 21, AHCI 1.3.1
-ahci0: device not communicating on port 0
+ahci0: port 0: 6.0Gb/s
 scsibus0 at ahci0: 32 targets
+sd0 at scsibus0 targ 0 lun 0: <ATA, 256GB SSD, V1.3> naa.5000000000000000
+sd0: 244198MB, 512 bytes/sector, 500118192 sectors, thin

OK kettenis

diff --git a/sys/dev/pci/ahci_pci.c b/sys/dev/pci/ahci_pci.c
index 183df33..964abde 100644 (file)
--- a/sys/dev/pci/ahci_pci.c
+++ b/sys/dev/pci/ahci_pci.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: ahci_pci.c,v 1.17 2024/05/24 06:02:53 jsg Exp $ */
+/*     $OpenBSD: ahci_pci.c,v 1.18 2024/06/16 18:00:08 kn Exp $ */
 
 /*
  * Copyright (c) 2006 David Gwynne <dlg@openbsd.org>
@@ -71,6 +71,8 @@ int                   ahci_intel_attach(struct ahci_softc *,
                            struct pci_attach_args *);
 int                    ahci_samsung_attach(struct ahci_softc *,
                            struct pci_attach_args *);
+int                    ahci_storx_attach(struct ahci_softc *,
+                           struct pci_attach_args *);
 
 static const struct ahci_device ahci_devices[] = {
        { PCI_VENDOR_AMD,       PCI_PRODUCT_AMD_HUDSON2_SATA_1,
@@ -148,7 +150,10 @@ static const struct ahci_device ahci_devices[] = {
            NULL,               ahci_samsung_attach },
 
        { PCI_VENDOR_VIATECH,   PCI_PRODUCT_VIATECH_VT8251_SATA,
-         ahci_no_match,        ahci_vt8251_attach }
+         ahci_no_match,        ahci_vt8251_attach },
+
+       { PCI_VENDOR_ZHAOXIN,   PCI_PRODUCT_ZHAOXIN_STORX_AHCI,
+         NULL,                 ahci_storx_attach },
 };
 
 int                    ahci_pci_match(struct device *, void *, void *);
@@ -285,6 +290,19 @@ ahci_samsung_attach(struct ahci_softc *sc, struct pci_attach_args *pa)
        return (0);
 }
 
+int
+ahci_storx_attach(struct ahci_softc *sc, struct pci_attach_args *pa)
+{
+       /*
+        * Disable MSI with the ZX-100/ZX-200/ZX-E StorX AHCI Controller
+        * in the Unchartevice 6640MA notebook, otherwise ahci(4) hangs
+        * with SATA speed set to "Gen3" in BIOS.
+        */
+       sc->sc_flags |= AHCI_F_NO_MSI;
+
+       return (0);
+}
+
 int
 ahci_pci_match(struct device *parent, void *match, void *aux)
 {