diff mbox series

sam460ex: Fix PCI interrupts with multiple devices

Message ID 20180731112006.737F77456B6@zero.eik.bme.hu (mailing list archive)
State New, archived
Headers show
Series sam460ex: Fix PCI interrupts with multiple devices | expand

Commit Message

BALATON Zoltan July 31, 2018, 11:08 a.m. UTC 
The four interrupts of the PCI bus are connected to the same UIC pin
on the real Sam460ex. Evidence for this can be found in the UBoot
source for the Sam460ex in the Sam460ex.c file where
PCI_INTERRUPT_LINE is written. Change the ppc440_pcix model to behave
more like this.

This fixes the problem that can be observed when adding further PCI
cards that got their interrupt rotated to other interrupts than PCI
INT A. In particular, the bug was observed with an additional OHCI PCI
card or an ES1370 sound device.

Signed-off-by: Sebastian Bauer <mail@sebastianbauer.info>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 hw/ppc/ppc440_pcix.c | 21 ++++++++-------------
 hw/ppc/sam460ex.c    |  6 ++----
 2 files changed, 10 insertions(+), 17 deletions(-)

Comments

Sebastian Bauer July 31, 2018, 9:55 p.m. UTC | #1 
Am 2018-07-31 13:08, schrieb BALATON Zoltan:
> The four interrupts of the PCI bus are connected to the same UIC pin
> on the real Sam460ex. Evidence for this can be found in the UBoot
> source for the Sam460ex in the Sam460ex.c file where
> PCI_INTERRUPT_LINE is written. Change the ppc440_pcix model to behave
> more like this.
> 
> This fixes the problem that can be observed when adding further PCI
> cards that got their interrupt rotated to other interrupts than PCI
> INT A. In particular, the bug was observed with an additional OHCI PCI
> card or an ES1370 sound device.
[...]
> diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
> index 0999efc..9c77183 100644
> --- a/hw/ppc/sam460ex.c
> +++ b/hw/ppc/sam460ex.c
> @@ -515,10 +515,8 @@ static void sam460ex_init(MachineState *machine)
> 
>      /* PCI bus */
>      ppc460ex_pcie_init(env);
> -    /* FIXME: is this correct? */
> -    dev = sysbus_create_varargs("ppc440-pcix-host", 0xc0ec00000,
> -                                uic[1][0], uic[1][20], uic[1][21], 
> uic[1][22],
> -                                NULL);
> +    /* All PCI irqs are connected to the same UIC pin (cf. UBoot 
> source) */
> +    dev = sysbus_create_simple("ppc440-pcix-host", 0xc0ec00000, 
> uic[1][0]);
>      pci_bus = (PCIBus *)qdev_get_child_bus(dev, "pci.0");
>      if (!pci_bus) {
>          error_report("couldn't create PCI controller!");

I'm fine with that change. I tested it with an additional OHCI 
controller on an emulated SAM machine under guest AmigaOS and it works.

Tested-by: Sebastian Bauer <mail@sebastianbauer.info>

Better usage of QOM etc. can IMO be done at a later time point as this 
fixes an unpleasant bug and any side change will just increase the 
probability to introduce new bugs.

Bye
Sebastian
David Gibson Aug. 1, 2018, 1:02 a.m. UTC | #2 
On Tue, Jul 31, 2018 at 11:55:02PM +0200, Sebastian Bauer wrote:
> Am 2018-07-31 13:08, schrieb BALATON Zoltan:
> > The four interrupts of the PCI bus are connected to the same UIC pin
> > on the real Sam460ex. Evidence for this can be found in the UBoot
> > source for the Sam460ex in the Sam460ex.c file where
> > PCI_INTERRUPT_LINE is written. Change the ppc440_pcix model to behave
> > more like this.
> > 
> > This fixes the problem that can be observed when adding further PCI
> > cards that got their interrupt rotated to other interrupts than PCI
> > INT A. In particular, the bug was observed with an additional OHCI PCI
> > card or an ES1370 sound device.
> [...]
> > diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
> > index 0999efc..9c77183 100644
> > --- a/hw/ppc/sam460ex.c
> > +++ b/hw/ppc/sam460ex.c
> > @@ -515,10 +515,8 @@ static void sam460ex_init(MachineState *machine)
> > 
> >      /* PCI bus */
> >      ppc460ex_pcie_init(env);
> > -    /* FIXME: is this correct? */
> > -    dev = sysbus_create_varargs("ppc440-pcix-host", 0xc0ec00000,
> > -                                uic[1][0], uic[1][20], uic[1][21],
> > uic[1][22],
> > -                                NULL);
> > +    /* All PCI irqs are connected to the same UIC pin (cf. UBoot
> > source) */
> > +    dev = sysbus_create_simple("ppc440-pcix-host", 0xc0ec00000,
> > uic[1][0]);
> >      pci_bus = (PCIBus *)qdev_get_child_bus(dev, "pci.0");
> >      if (!pci_bus) {
> >          error_report("couldn't create PCI controller!");
> 
> I'm fine with that change. I tested it with an additional OHCI controller on
> an emulated SAM machine under guest AmigaOS and it works.
> 
> Tested-by: Sebastian Bauer <mail@sebastianbauer.info>
> 
> Better usage of QOM etc. can IMO be done at a later time point as this fixes
> an unpleasant bug and any side change will just increase the probability to
> introduce new bugs.

Thanks, applied to ppc-for-3.0.  I hope to send a pull request for
that today.
diff mbox series

Patch

diff --git a/hw/ppc/ppc440_pcix.c b/hw/ppc/ppc440_pcix.c
index d8af04b..64ed07a 100644
--- a/hw/ppc/ppc440_pcix.c
+++ b/hw/ppc/ppc440_pcix.c
@@ -57,7 +57,7 @@  typedef struct PPC440PCIXState {
     struct PLBOutMap pom[PPC440_PCIX_NR_POMS];
     struct PLBInMap pim[PPC440_PCIX_NR_PIMS];
     uint32_t sts;
-    qemu_irq irq[PCI_NUM_PINS];
+    qemu_irq irq;
     AddressSpace bm_as;
     MemoryRegion bm;
 
@@ -418,21 +418,20 @@  static void ppc440_pcix_reset(DeviceState *dev)
  * This may need further refactoring for other boards. */
 static int ppc440_pcix_map_irq(PCIDevice *pci_dev, int irq_num)
 {
-    int slot = pci_dev->devfn >> 3;
-    trace_ppc440_pcix_map_irq(pci_dev->devfn, irq_num, slot);
-    return slot - 1;
+    trace_ppc440_pcix_map_irq(pci_dev->devfn, irq_num, 0);
+    return 0;
 }
 
 static void ppc440_pcix_set_irq(void *opaque, int irq_num, int level)
 {
-    qemu_irq *pci_irqs = opaque;
+    qemu_irq *pci_irq = opaque;
 
     trace_ppc440_pcix_set_irq(irq_num);
     if (irq_num < 0) {
         error_report("%s: PCI irq %d", __func__, irq_num);
         return;
     }
-    qemu_set_irq(pci_irqs[irq_num], level);
+    qemu_set_irq(*pci_irq, level);
 }
 
 static AddressSpace *ppc440_pcix_set_iommu(PCIBus *b, void *opaque, int devfn)
@@ -471,19 +470,15 @@  static int ppc440_pcix_initfn(SysBusDevice *dev)
 {
     PPC440PCIXState *s;
     PCIHostState *h;
-    int i;
 
     h = PCI_HOST_BRIDGE(dev);
     s = PPC440_PCIX_HOST_BRIDGE(dev);
 
-    for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
-        sysbus_init_irq(dev, &s->irq[i]);
-    }
-
+    sysbus_init_irq(dev, &s->irq);
     memory_region_init(&s->busmem, OBJECT(dev), "pci bus memory", UINT64_MAX);
     h->bus = pci_register_root_bus(DEVICE(dev), NULL, ppc440_pcix_set_irq,
-                         ppc440_pcix_map_irq, s->irq, &s->busmem,
-                         get_system_io(), PCI_DEVFN(0, 0), 4, TYPE_PCI_BUS);
+                         ppc440_pcix_map_irq, &s->irq, &s->busmem,
+                         get_system_io(), PCI_DEVFN(0, 0), 1, TYPE_PCI_BUS);
 
     s->dev = pci_create_simple(h->bus, PCI_DEVFN(0, 0), "ppc4xx-host-bridge");
 
diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
index 0999efc..9c77183 100644
--- a/hw/ppc/sam460ex.c
+++ b/hw/ppc/sam460ex.c
@@ -515,10 +515,8 @@  static void sam460ex_init(MachineState *machine)
 
     /* PCI bus */
     ppc460ex_pcie_init(env);
-    /* FIXME: is this correct? */
-    dev = sysbus_create_varargs("ppc440-pcix-host", 0xc0ec00000,
-                                uic[1][0], uic[1][20], uic[1][21], uic[1][22],
-                                NULL);
+    /* All PCI irqs are connected to the same UIC pin (cf. UBoot source) */
+    dev = sysbus_create_simple("ppc440-pcix-host", 0xc0ec00000, uic[1][0]);
     pci_bus = (PCIBus *)qdev_get_child_bus(dev, "pci.0");
     if (!pci_bus) {
         error_report("couldn't create PCI controller!");