Re: [Xen-devel] intel IGD driver intel_detect_pch() failure

["G.R." <firemeteor@xxxxxxxxxxxxxxxxxxxxx>]

On Fri, Dec 14, 2012 at 10:39 AM, G.R. <firemeteor@xxxxxxxxxxxxxxxxxxxxx> wrote:
> On Fri, Dec 14, 2012 at 1:39 AM, G.R. <firemeteor@xxxxxxxxxxxxxxxxxxxxx> 
> wrote:
>> On Thu, Dec 13, 2012 at 10:33 PM, G.R. <firemeteor@xxxxxxxxxxxxxxxxxxxxx> 
>> wrote:
>>> On Thu, Dec 13, 2012 at 8:43 PM, Stefano Stabellini
>>> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>>>>
>>>> Does this patch work for you?
>>>>
>>>
>>> It appears that you change the exposed 1f.0 bridge into an ISA bridge.
>>> The driver should be able to recognize it -- as long as it is not
>>> hidden by the PIIX3 bridge.
>>> I wonder if there is way to entirely override that one...
>>> But anyway I'll try it out first.
>>>
>>
>> Stefano, your patch does not produce an ISA bridge as expected.
>> The device as viewed from the domU is like this:
>> 00:1f.0 Non-VGA unclassified device [0000]: Intel Corporation H77
>> Express Chipset LPC Controller [8086:1e4a] (rev 04)
>>
>> I'm on the latest 4.2-testing branch just synced && built for your patch.
>>
>
> Some more info from lspci:
>
> Intel ISA bridge as seen from dom0:
> 00:1f.0 ISA bridge: Intel Corporation H77 Express Chipset LPC
> Controller (rev 04)
> 00: 86 80 4a 1e 07 00 10 02 04 00 01 06 00 00 80 00
> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 20: 00 00 00 00 00 00 00 00 00 00 00 00 49 18 4a 1e
> 30: 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00
>
> After exposed to domU
> 00:1f.0 Non-VGA unclassified device: Intel Corporation H77 Express
> Chipset LPC Controller (rev 04)
> 00: 86 80 4a 1e 07 00 a0 00 04 00 01 06 00 10 81 00
> 10: 00 50 42 f1 10 50 42 f1 00 01 01 f1 30 50 42 f1
> 20: 40 50 42 f1 50 50 42 f1 00 00 00 00 f4 1a 00 11
> 30: 60 50 42 f1 00 00 00 00 00 00 00 00 00 00 00 00
>
> The PIIX3 ISA bridge as emulated by qemu:
>
> 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
> 00: 86 80 00 70 07 00 00 02 00 00 01 06 00 00 80 00
> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 20: 00 00 00 00 00 00 00 00 00 00 00 00 f4 1a 00 11
> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> I have no idea if this is due to the header type set to 0x81 (pci-pci
> bridge, multi-functional), or some other fields need to be cleared...
>

I did another experiment to change the header type to 0x80.
The devices now shows up as an ISA bridge.
But as long as the PIIX3 bridge cannot be overridden, I need another
hack in intel driver to make it work.

This is the local hack I made, based on kernel 3.2.31.
But the function does not change in new version, other than new chip support.
Not sure if this change is acceptable to upstream...

--- i915_drv.c.orig    2012-10-10 10:31:37.000000000 +0800
+++ i915_drv.c    2012-12-14 19:10:32.000000000 +0800
@@ -303,6 +303,7 @@
 {
     struct drm_i915_private *dev_priv = dev->dev_private;
     struct pci_dev *pch;
+    unsigned found = 0;

     /*
      * The reason to probe ISA bridge instead of Dev31:Fun0 is to
@@ -311,11 +312,13 @@
      * underneath. This is a requirement from virtualization team.
      */
     pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
-    if (pch) {
+    while (pch) {
         if (pch->vendor == PCI_VENDOR_ID_INTEL) {
             int id;
             id = pch->device & INTEL_PCH_DEVICE_ID_MASK;

+            found = pch->device;
+
             if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
                 dev_priv->pch_type = PCH_IBX;
                 DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
@@ -326,9 +329,21 @@
                 /* PantherPoint is CPT compatible */
                 dev_priv->pch_type = PCH_CPT;
                 DRM_DEBUG_KMS("Found PatherPoint PCH\n");
+            } else {
+                found = 0;
             }
+                }
+                if (found) {
+            pci_dev_put(pch);
+            break;
+        } else {
+            struct pci_dev *curr = pch;
+            pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, curr);
+            pci_dev_put(curr);
         }
-        pci_dev_put(pch);
+    }
+    if (!found) {
+        DRM_DEBUG_KMS("intel PCH detect failed, nothing found\n");
     }
 }



>
>> Thanks,
>> Timothy
>>
>>>>
>>>>
>>>> diff --git a/hw/pci.c b/hw/pci.c
>>>> index f051de1..d371bd7 100644
>>>> --- a/hw/pci.c
>>>> +++ b/hw/pci.c
>>>> @@ -871,11 +871,6 @@ void pci_unplug_netifs(void)
>>>>      }
>>>>  }
>>>>
>>>> -typedef struct {
>>>> -    PCIDevice dev;
>>>> -    PCIBus *bus;
>>>> -} PCIBridge;
>>>> -
>>>>  void pci_bridge_write_config(PCIDevice *d,
>>>>                               uint32_t address, uint32_t val, int len)
>>>>  {
>>>> diff --git a/hw/pci.h b/hw/pci.h
>>>> index edc58b6..c2acab9 100644
>>>> --- a/hw/pci.h
>>>> +++ b/hw/pci.h
>>>> @@ -222,6 +222,11 @@ struct PCIDevice {
>>>>      int irq_state[4];
>>>>  };
>>>>
>>>> +typedef struct {
>>>> +    PCIDevice dev;
>>>> +    PCIBus *bus;
>>>> +} PCIBridge;
>>>> +
>>>>  extern char direct_pci_str[];
>>>>  extern int direct_pci_msitranslate;
>>>>  extern int direct_pci_power_mgmt;
>>>> diff --git a/hw/pt-graphics.c b/hw/pt-graphics.c
>>>> index c6f8869..d8e789f 100644
>>>> --- a/hw/pt-graphics.c
>>>> +++ b/hw/pt-graphics.c
>>>> @@ -3,6 +3,7 @@
>>>>   */
>>>>
>>>>  #include "pass-through.h"
>>>> +#include "pci.h"
>>>>  #include "pci/header.h"
>>>>  #include "pci/pci.h"
>>>>
>>>> @@ -40,9 +41,26 @@ void intel_pch_init(PCIBus *bus)
>>>>      did = pt_pci_host_read(pci_dev_1f, PCI_DEVICE_ID, 2);
>>>>      rid = pt_pci_host_read(pci_dev_1f, PCI_REVISION, 1);
>>>>
>>>> -    if ( vid == PCI_VENDOR_ID_INTEL )
>>>> -        pci_bridge_init(bus, PCI_DEVFN(0x1f, 0), vid, did, rid,
>>>> -                        pch_map_irq, "intel_bridge_1f");
>>>> +    if (vid == PCI_VENDOR_ID_INTEL) {
>>>> +        PCIBridge *s = (PCIBridge *)pci_register_device(bus, 
>>>> "intel_bridge_1f",
>>>> +                sizeof(PCIBridge), PCI_DEVFN(0x1f, 0), NULL, 
>>>> pci_bridge_write_config);
>>>> +
>>>> +        pci_config_set_vendor_id(s->dev.config, vid);
>>>> +        pci_config_set_device_id(s->dev.config, did);
>>>> +
>>>> +        s->dev.config[PCI_COMMAND] = 0x06; // command = bus master, pci 
>>>> mem
>>>> +        s->dev.config[PCI_COMMAND + 1] = 0x00;
>>>> +        s->dev.config[PCI_STATUS] = 0xa0; // status = fast back-to-back, 
>>>> 66MHz, no error
>>>> +        s->dev.config[PCI_STATUS + 1] = 0x00; // status = fast devsel
>>>> +        s->dev.config[PCI_REVISION] = rid;
>>>> +        s->dev.config[PCI_CLASS_PROG] = 0x00; // programming i/f
>>>> +        pci_config_set_class(s->dev.config, PCI_CLASS_BRIDGE_ISA);
>>>> +        s->dev.config[PCI_LATENCY_TIMER] = 0x10;
>>>> +        s->dev.config[PCI_HEADER_TYPE] = 0x81;
>>>> +        s->dev.config[PCI_SEC_STATUS] = 0xa0;
>>>> +
>>>> +        s->bus = pci_register_secondary_bus(&s->dev, pch_map_irq);
>>>> +    }
>>>>  }
>>>>
>>>>  uint32_t igd_read_opregion(struct pt_dev *pci_dev)

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