diff mbox series

[3/5] s390: vfio_pci: Use a PCI Group structure

Message ID 1557499133-24169-4-git-send-email-pmorel@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series Retrieving zPCI specific info from QEMU | expand

Commit Message

Pierre Morel May 10, 2019, 2:38 p.m. UTC 
We use a S390PCIGroup structure to hold the information
related to zPCI Function group.

This allows us to be ready to support multiple groups and to retrieve
the group information from the host.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c  | 42 ++++++++++++++++++++++++++++++++++++++++++
 hw/s390x/s390-pci-bus.h  | 11 ++++++++++-
 hw/s390x/s390-pci-inst.c | 22 +++++++++++++---------
 3 files changed, 65 insertions(+), 10 deletions(-)

Comments

Cornelia Huck May 14, 2019, 11:49 a.m. UTC | #1 
On Fri, 10 May 2019 16:38:51 +0200
Pierre Morel <pmorel@linux.ibm.com> wrote:

> We use a S390PCIGroup structure to hold the information
> related to zPCI Function group.
> 
> This allows us to be ready to support multiple groups and to retrieve
> the group information from the host.

What if there is no host to retrieve information from?

> 
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
>  hw/s390x/s390-pci-bus.c  | 42 ++++++++++++++++++++++++++++++++++++++++++
>  hw/s390x/s390-pci-bus.h  | 11 ++++++++++-
>  hw/s390x/s390-pci-inst.c | 22 +++++++++++++---------
>  3 files changed, 65 insertions(+), 10 deletions(-)

> diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
> index be28962..8147847 100644
> --- a/hw/s390x/s390-pci-inst.c
> +++ b/hw/s390x/s390-pci-inst.c
> @@ -284,21 +284,25 @@ int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra)
>          stq_p(&resquery->edma, ZPCI_EDMA_ADDR);
>          stl_p(&resquery->fid, pbdev->fid);
>          stw_p(&resquery->pchid, 0);
> -        stw_p(&resquery->ug, 1);
> +        stw_p(&resquery->ug, ZPCI_DEFAULT_FN_GRP);
>          stl_p(&resquery->uid, pbdev->uid);
>          stw_p(&resquery->hdr.rsp, CLP_RC_OK);
>          break;
>      }
>      case CLP_QUERY_PCI_FNGRP: {
>          ClpRspQueryPciGrp *resgrp = (ClpRspQueryPciGrp *)resh;
> -        resgrp->fr = 1;
> -        stq_p(&resgrp->dasm, 0);
> -        stq_p(&resgrp->msia, ZPCI_MSI_ADDR);
> -        stw_p(&resgrp->mui, DEFAULT_MUI);
> -        stw_p(&resgrp->i, 128);
> -        stw_p(&resgrp->maxstbl, 128);
> -        resgrp->version = 0;
>  
> +        ClpReqQueryPciGrp *reqgrp = (ClpReqQueryPciGrp *)reqh;
> +        S390PCIGroup *grp;
> +
> +        grp = s390_grp_find(reqgrp->g);
> +        if (!grp) {
> +            /* We do not allow access to unknown groups */
> +            /* The group must have been obtained with a vfio device */

What about non-vfio devices? How does this whole feature work for
emulated devices?

> +            stw_p(&resgrp->hdr.rsp, CLP_RC_QUERYPCIFG_PFGID);
> +            goto out;
> +        }
> +        memcpy(resgrp, &grp->zpci_grp, sizeof(ClpRspQueryPciGrp));
>          stw_p(&resgrp->hdr.rsp, CLP_RC_OK);
>          break;
>      }
> @@ -752,7 +756,7 @@ int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr,
>      }
>      /* Length must be greater than 8, a multiple of 8 */
>      /* and not greater than maxstbl */
> -    if ((len <= 8) || (len % 8) || (len > pbdev->maxstbl)) {
> +    if ((len <= 8) || (len % 8) || (len > pbdev->pci_grp->zpci_grp.maxstbl)) {
>          goto specification_error;
>      }
>      /* Do not cross a 4K-byte boundary */
Pierre Morel May 16, 2019, 8:55 a.m. UTC | #2 
On 14/05/2019 13:49, Cornelia Huck wrote:
> On Fri, 10 May 2019 16:38:51 +0200
> Pierre Morel <pmorel@linux.ibm.com> wrote:
> 
>> We use a S390PCIGroup structure to hold the information
>> related to zPCI Function group.
>>
>> This allows us to be ready to support multiple groups and to retrieve
>> the group information from the host.
> 
> What if there is no host to retrieve information from?

There is a default group for emulate devices.
I will enhance the comment.

Thanks

> 
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>>   hw/s390x/s390-pci-bus.c  | 42 ++++++++++++++++++++++++++++++++++++++++++
>>   hw/s390x/s390-pci-bus.h  | 11 ++++++++++-
>>   hw/s390x/s390-pci-inst.c | 22 +++++++++++++---------
>>   3 files changed, 65 insertions(+), 10 deletions(-)
> 
>> diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
>> index be28962..8147847 100644
>> --- a/hw/s390x/s390-pci-inst.c
>> +++ b/hw/s390x/s390-pci-inst.c
>> @@ -284,21 +284,25 @@ int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra)
>>           stq_p(&resquery->edma, ZPCI_EDMA_ADDR);
>>           stl_p(&resquery->fid, pbdev->fid);
>>           stw_p(&resquery->pchid, 0);
>> -        stw_p(&resquery->ug, 1);
>> +        stw_p(&resquery->ug, ZPCI_DEFAULT_FN_GRP);
>>           stl_p(&resquery->uid, pbdev->uid);
>>           stw_p(&resquery->hdr.rsp, CLP_RC_OK);
>>           break;
>>       }
>>       case CLP_QUERY_PCI_FNGRP: {
>>           ClpRspQueryPciGrp *resgrp = (ClpRspQueryPciGrp *)resh;
>> -        resgrp->fr = 1;
>> -        stq_p(&resgrp->dasm, 0);
>> -        stq_p(&resgrp->msia, ZPCI_MSI_ADDR);
>> -        stw_p(&resgrp->mui, DEFAULT_MUI);
>> -        stw_p(&resgrp->i, 128);
>> -        stw_p(&resgrp->maxstbl, 128);
>> -        resgrp->version = 0;
>>   
>> +        ClpReqQueryPciGrp *reqgrp = (ClpReqQueryPciGrp *)reqh;
>> +        S390PCIGroup *grp;
>> +
>> +        grp = s390_grp_find(reqgrp->g);
>> +        if (!grp) {
>> +            /* We do not allow access to unknown groups */
>> +            /* The group must have been obtained with a vfio device */
> 
> What about non-vfio devices? How does this whole feature work for
> emulated devices?

Emulated devices get a default group with predefined values.
The predefined values we used before this series.
I will modify the patch comment to explain the emulated devices case.
Thanks for the comments.

Regards,
Pierre
diff mbox series

Patch

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 2d0a28d..175ea8c 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -729,6 +729,46 @@  static void s390_pci_iommu_free(S390pciState *s, PCIBus *bus, int32_t devfn)
     object_unref(OBJECT(iommu));
 }
 
+static S390PCIGroup *s390_grp_create(int ug)
+{
+    S390PCIGroup *grp;
+    S390pciState *s = s390_get_phb();
+
+    grp = g_new0(S390PCIGroup, 1);
+    grp->ug = ug;
+    QTAILQ_INSERT_TAIL(&s->zpci_grps, grp, link);
+    return grp;
+}
+
+S390PCIGroup *s390_grp_find(int ug)
+{
+    S390PCIGroup *grp;
+    S390pciState *s = s390_get_phb();
+
+    QTAILQ_FOREACH(grp, &s->zpci_grps, link) {
+        if ((grp->ug & CLP_REQ_QPCIG_MASK_PFGID) == ug) {
+            return grp;
+        }
+    }
+    return NULL;
+}
+
+static void s390_pci_init_default_group(void)
+{
+    S390PCIGroup *grp;
+    ClpRspQueryPciGrp *resgrp;
+
+    grp = s390_grp_create(ZPCI_DEFAULT_FN_GRP);
+    resgrp = &grp->zpci_grp;
+    resgrp->fr = 1;
+    stq_p(&resgrp->dasm, 0);
+    stq_p(&resgrp->msia, ZPCI_MSI_ADDR);
+    stw_p(&resgrp->mui, DEFAULT_MUI);
+    stw_p(&resgrp->i, 128);
+    stw_p(&resgrp->maxstbl, 128);
+    resgrp->version = 0;
+}
+
 static void s390_pcihost_realize(DeviceState *dev, Error **errp)
 {
     PCIBus *b;
@@ -765,7 +805,9 @@  static void s390_pcihost_realize(DeviceState *dev, Error **errp)
     s->bus_no = 0;
     QTAILQ_INIT(&s->pending_sei);
     QTAILQ_INIT(&s->zpci_devs);
+    QTAILQ_INIT(&s->zpci_grps);
 
+    s390_pci_init_default_group();
     css_register_io_adapters(CSS_IO_ADAPTER_PCI, true, false,
                              S390_ADAPTER_SUPPRESSIBLE, &local_err);
     error_propagate(errp, local_err);
diff --git a/hw/s390x/s390-pci-bus.h b/hw/s390x/s390-pci-bus.h
index a5d2049..e95a797 100644
--- a/hw/s390x/s390-pci-bus.h
+++ b/hw/s390x/s390-pci-bus.h
@@ -312,6 +312,14 @@  typedef struct ZpciFmb {
 } ZpciFmb;
 QEMU_BUILD_BUG_MSG(offsetof(ZpciFmb, fmt0) != 48, "padding in ZpciFmb");
 
+#define ZPCI_DEFAULT_FN_GRP 0x20
+typedef struct S390PCIGroup {
+    ClpRspQueryPciGrp zpci_grp;
+    int ug;
+    QTAILQ_ENTRY(S390PCIGroup) link;
+} S390PCIGroup;
+S390PCIGroup *s390_grp_find(int ug);
+
 struct S390PCIBusDevice {
     DeviceState qdev;
     PCIDevice *pdev;
@@ -327,8 +335,8 @@  struct S390PCIBusDevice {
     QEMUTimer *fmb_timer;
     uint8_t isc;
     uint16_t noi;
-    uint16_t maxstbl;
     uint8_t sum;
+    S390PCIGroup *pci_grp;
     S390MsixInfo msix;
     AdapterRoutes routes;
     S390PCIIOMMU *iommu;
@@ -353,6 +361,7 @@  typedef struct S390pciState {
     GHashTable *zpci_table;
     QTAILQ_HEAD(, SeiContainer) pending_sei;
     QTAILQ_HEAD(, S390PCIBusDevice) zpci_devs;
+    QTAILQ_HEAD(, S390PCIGroup) zpci_grps;
 } S390pciState;
 
 S390pciState *s390_get_phb(void);
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index be28962..8147847 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -284,21 +284,25 @@  int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra)
         stq_p(&resquery->edma, ZPCI_EDMA_ADDR);
         stl_p(&resquery->fid, pbdev->fid);
         stw_p(&resquery->pchid, 0);
-        stw_p(&resquery->ug, 1);
+        stw_p(&resquery->ug, ZPCI_DEFAULT_FN_GRP);
         stl_p(&resquery->uid, pbdev->uid);
         stw_p(&resquery->hdr.rsp, CLP_RC_OK);
         break;
     }
     case CLP_QUERY_PCI_FNGRP: {
         ClpRspQueryPciGrp *resgrp = (ClpRspQueryPciGrp *)resh;
-        resgrp->fr = 1;
-        stq_p(&resgrp->dasm, 0);
-        stq_p(&resgrp->msia, ZPCI_MSI_ADDR);
-        stw_p(&resgrp->mui, DEFAULT_MUI);
-        stw_p(&resgrp->i, 128);
-        stw_p(&resgrp->maxstbl, 128);
-        resgrp->version = 0;
 
+        ClpReqQueryPciGrp *reqgrp = (ClpReqQueryPciGrp *)reqh;
+        S390PCIGroup *grp;
+
+        grp = s390_grp_find(reqgrp->g);
+        if (!grp) {
+            /* We do not allow access to unknown groups */
+            /* The group must have been obtained with a vfio device */
+            stw_p(&resgrp->hdr.rsp, CLP_RC_QUERYPCIFG_PFGID);
+            goto out;
+        }
+        memcpy(resgrp, &grp->zpci_grp, sizeof(ClpRspQueryPciGrp));
         stw_p(&resgrp->hdr.rsp, CLP_RC_OK);
         break;
     }
@@ -752,7 +756,7 @@  int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr,
     }
     /* Length must be greater than 8, a multiple of 8 */
     /* and not greater than maxstbl */
-    if ((len <= 8) || (len % 8) || (len > pbdev->maxstbl)) {
+    if ((len <= 8) || (len % 8) || (len > pbdev->pci_grp->zpci_grp.maxstbl)) {
         goto specification_error;
     }
     /* Do not cross a 4K-byte boundary */