* [Qemu-devel] [RFC v4 6/6] i386/acpi-build: pxb-pcie start bus should always be 0 in separate pci domain
@ 2018-08-09 6:35 Zihan Yang
2018-08-17 17:54 ` Marcel Apfelbaum
0 siblings, 1 reply; 3+ messages in thread
From: Zihan Yang @ 2018-08-09 6:35 UTC (permalink / raw)
To: qemu-devel
Cc: Zihan Yang, Michael S. Tsirkin, Igor Mammedov, Marcel Apfelbaum,
Paolo Bonzini, Richard Henderson, Eduardo Habkost
The bus_nr indicates the bus number of pxb-pcie under pcie.0, but since pxb
host can be put into different pci domain, the start bus should always be 0
Signed-off-by: Zihan Yang <whois.zihan.yang@gmail.com>
---
hw/i386/acpi-build.c | 14 ++------------
hw/pci-bridge/pci_expander_bridge.c | 10 +++++-----
2 files changed, 7 insertions(+), 17 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index a7d9af2..0911008 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -91,7 +91,6 @@ typedef struct AcpiMcfgInfo {
uint64_t mcfg_base;
uint32_t mcfg_size;
uint32_t domain_nr;
- uint8_t bus_nr; // start bus number
struct AcpiMcfgInfo *next;
} AcpiMcfgInfo;
@@ -2470,8 +2469,8 @@ build_mcfg_q35(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info)
while (info) {
mcfg[0].allocation[count].address = cpu_to_le64(info->mcfg_base);
mcfg[0].allocation[count].pci_segment = cpu_to_le16(info->domain_nr);
- mcfg[0].allocation[count].start_bus_number = info->bus_nr;
- mcfg[0].allocation[count++].end_bus_number = info->bus_nr + \
+ mcfg[0].allocation[count].start_bus_number = 0;
+ mcfg[0].allocation[count++].end_bus_number = \
PCIE_MMCFG_BUS(info->mcfg_size - 1);
info = info->next;
}
@@ -2694,15 +2693,6 @@ static AcpiMcfgInfo *acpi_get_mcfg(void)
mcfg->mcfg_size = qnum_get_uint(qobject_to(QNum, o));
qobject_unref(o);
- o = object_property_get_qobject(obj, PROP_PXB_BUS_NR, NULL);
- if (!o) {
- /* we are in q35 host again */
- mcfg->bus_nr = 0;
- } else {
- mcfg->bus_nr = qnum_get_uint(qobject_to(QNum, o));
- qobject_unref(o);
- }
-
pci_host = OBJECT(QTAILQ_NEXT(PCI_HOST_BRIDGE(pci_host), next));
}
diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c
index 686b026..53f5776 100644
--- a/hw/pci-bridge/pci_expander_bridge.c
+++ b/hw/pci-bridge/pci_expander_bridge.c
@@ -91,7 +91,7 @@ static int pxb_bus_num(PCIBus *bus)
{
PXBDev *pxb = convert_to_pxb(bus->parent_dev);
- return pxb->bus_nr;
+ return pxb->domain_nr ? 0 : pxb->bus_nr;
}
static int pxb_domain_num(PCIBus *bus)
@@ -145,8 +145,8 @@ static void pxb_pcie_foreach(gpointer data, gpointer user_data)
if (pxb->domain_nr > 0) {
/* only reserve what users ask for to reduce memory cost. Plus one
- * as the interval [bus_nr, max_bus] has (max_bus-bus_nr+1) buses */
- pxb_mcfg_hole_size += ((pxb->max_bus - pxb->bus_nr + 1ULL) * MiB);
+ * as the interval [0, max_bus] has (max_bus+1) buses */
+ pxb_mcfg_hole_size += ((pxb->max_bus + 1ULL) * MiB);
}
}
@@ -385,9 +385,9 @@ static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
/* will be overwritten by firmware, but kept for readability */
qdev_prop_set_uint64(ds, PCIE_HOST_MCFG_BASE,
pxb->domain_nr ? pxb_pcie_mcfg_base : MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
- /* +1 because [bus_nr, max_bus] has (max_bus-bus_nr+1) buses */
+ /* +1 because [0, max_bus] has (max_bus+1) buses */
qdev_prop_set_uint64(ds, PCIE_HOST_MCFG_SIZE,
- pxb->domain_nr ? (pxb->max_bus - pxb->bus_nr + 1ULL) * MiB : 0);
+ pxb->domain_nr ? (pxb->max_bus + 1ULL) * MiB : 0);
if (pxb->domain_nr)
pxb_pcie_mcfg_base += ((pxb->max_bus + 1ULL) * MiB);
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [RFC v4 6/6] i386/acpi-build: pxb-pcie start bus should always be 0 in separate pci domain
2018-08-09 6:35 [Qemu-devel] [RFC v4 6/6] i386/acpi-build: pxb-pcie start bus should always be 0 in separate pci domain Zihan Yang
@ 2018-08-17 17:54 ` Marcel Apfelbaum
2018-08-19 2:02 ` Zihan Yang
0 siblings, 1 reply; 3+ messages in thread
From: Marcel Apfelbaum @ 2018-08-17 17:54 UTC (permalink / raw)
To: Zihan Yang, qemu-devel
Cc: Michael S. Tsirkin, Igor Mammedov, Paolo Bonzini,
Richard Henderson, Eduardo Habkost
On 08/09/2018 09:35 AM, Zihan Yang wrote:
> The bus_nr indicates the bus number of pxb-pcie under pcie.0, but since pxb
> host can be put into different pci domain, the start bus should always be 0
I am not sure about this limitation. Do you know where is coming from?
Why do we must start a different pci_domain from 0? (Maybe we do, I just
want to be sure)
Thanks,
Marcel
>
> Signed-off-by: Zihan Yang <whois.zihan.yang@gmail.com>
> ---
> hw/i386/acpi-build.c | 14 ++------------
> hw/pci-bridge/pci_expander_bridge.c | 10 +++++-----
> 2 files changed, 7 insertions(+), 17 deletions(-)
>
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index a7d9af2..0911008 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -91,7 +91,6 @@ typedef struct AcpiMcfgInfo {
> uint64_t mcfg_base;
> uint32_t mcfg_size;
> uint32_t domain_nr;
> - uint8_t bus_nr; // start bus number
> struct AcpiMcfgInfo *next;
> } AcpiMcfgInfo;
>
> @@ -2470,8 +2469,8 @@ build_mcfg_q35(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info)
> while (info) {
> mcfg[0].allocation[count].address = cpu_to_le64(info->mcfg_base);
> mcfg[0].allocation[count].pci_segment = cpu_to_le16(info->domain_nr);
> - mcfg[0].allocation[count].start_bus_number = info->bus_nr;
> - mcfg[0].allocation[count++].end_bus_number = info->bus_nr + \
> + mcfg[0].allocation[count].start_bus_number = 0;
> + mcfg[0].allocation[count++].end_bus_number = \
> PCIE_MMCFG_BUS(info->mcfg_size - 1);
> info = info->next;
> }
> @@ -2694,15 +2693,6 @@ static AcpiMcfgInfo *acpi_get_mcfg(void)
> mcfg->mcfg_size = qnum_get_uint(qobject_to(QNum, o));
> qobject_unref(o);
>
> - o = object_property_get_qobject(obj, PROP_PXB_BUS_NR, NULL);
> - if (!o) {
> - /* we are in q35 host again */
> - mcfg->bus_nr = 0;
> - } else {
> - mcfg->bus_nr = qnum_get_uint(qobject_to(QNum, o));
> - qobject_unref(o);
> - }
> -
> pci_host = OBJECT(QTAILQ_NEXT(PCI_HOST_BRIDGE(pci_host), next));
> }
>
> diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c
> index 686b026..53f5776 100644
> --- a/hw/pci-bridge/pci_expander_bridge.c
> +++ b/hw/pci-bridge/pci_expander_bridge.c
> @@ -91,7 +91,7 @@ static int pxb_bus_num(PCIBus *bus)
> {
> PXBDev *pxb = convert_to_pxb(bus->parent_dev);
>
> - return pxb->bus_nr;
> + return pxb->domain_nr ? 0 : pxb->bus_nr;
> }
>
> static int pxb_domain_num(PCIBus *bus)
> @@ -145,8 +145,8 @@ static void pxb_pcie_foreach(gpointer data, gpointer user_data)
>
> if (pxb->domain_nr > 0) {
> /* only reserve what users ask for to reduce memory cost. Plus one
> - * as the interval [bus_nr, max_bus] has (max_bus-bus_nr+1) buses */
> - pxb_mcfg_hole_size += ((pxb->max_bus - pxb->bus_nr + 1ULL) * MiB);
> + * as the interval [0, max_bus] has (max_bus+1) buses */
> + pxb_mcfg_hole_size += ((pxb->max_bus + 1ULL) * MiB);
> }
> }
>
> @@ -385,9 +385,9 @@ static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
> /* will be overwritten by firmware, but kept for readability */
> qdev_prop_set_uint64(ds, PCIE_HOST_MCFG_BASE,
> pxb->domain_nr ? pxb_pcie_mcfg_base : MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
> - /* +1 because [bus_nr, max_bus] has (max_bus-bus_nr+1) buses */
> + /* +1 because [0, max_bus] has (max_bus+1) buses */
> qdev_prop_set_uint64(ds, PCIE_HOST_MCFG_SIZE,
> - pxb->domain_nr ? (pxb->max_bus - pxb->bus_nr + 1ULL) * MiB : 0);
> + pxb->domain_nr ? (pxb->max_bus + 1ULL) * MiB : 0);
> if (pxb->domain_nr)
> pxb_pcie_mcfg_base += ((pxb->max_bus + 1ULL) * MiB);
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [RFC v4 6/6] i386/acpi-build: pxb-pcie start bus should always be 0 in separate pci domain
2018-08-17 17:54 ` Marcel Apfelbaum
@ 2018-08-19 2:02 ` Zihan Yang
0 siblings, 0 replies; 3+ messages in thread
From: Zihan Yang @ 2018-08-19 2:02 UTC (permalink / raw)
To: Marcel Apfelbaum; +Cc: qemu-devel, Michael S. Tsirkin
Marcel Apfelbaum <marcel.apfelbaum@gmail.com> 于2018年8月18日周六 上午1:54写道:
>
>
>
> On 08/09/2018 09:35 AM, Zihan Yang wrote:
> > The bus_nr indicates the bus number of pxb-pcie under pcie.0, but since pxb
> > host can be put into different pci domain, the start bus should always be 0
>
> I am not sure about this limitation. Do you know where is coming from?
> Why do we must start a different pci_domain from 0? (Maybe we do, I just
> want to be sure)
I'm not sure about it either, for the same reason in previous patch. I thought
we should start from bus 0 always. I think I'll bring start_bus back
in next version.
> Thanks,
> Marcel
>
> >
> > Signed-off-by: Zihan Yang <whois.zihan.yang@gmail.com>
> > ---
> > hw/i386/acpi-build.c | 14 ++------------
> > hw/pci-bridge/pci_expander_bridge.c | 10 +++++-----
> > 2 files changed, 7 insertions(+), 17 deletions(-)
> >
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index a7d9af2..0911008 100644
> > --- a/hw/i386/acpi-build.c
> > +++ b/hw/i386/acpi-build.c
> > @@ -91,7 +91,6 @@ typedef struct AcpiMcfgInfo {
> > uint64_t mcfg_base;
> > uint32_t mcfg_size;
> > uint32_t domain_nr;
> > - uint8_t bus_nr; // start bus number
> > struct AcpiMcfgInfo *next;
> > } AcpiMcfgInfo;
> >
> > @@ -2470,8 +2469,8 @@ build_mcfg_q35(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info)
> > while (info) {
> > mcfg[0].allocation[count].address = cpu_to_le64(info->mcfg_base);
> > mcfg[0].allocation[count].pci_segment = cpu_to_le16(info->domain_nr);
> > - mcfg[0].allocation[count].start_bus_number = info->bus_nr;
> > - mcfg[0].allocation[count++].end_bus_number = info->bus_nr + \
> > + mcfg[0].allocation[count].start_bus_number = 0;
> > + mcfg[0].allocation[count++].end_bus_number = \
> > PCIE_MMCFG_BUS(info->mcfg_size - 1);
> > info = info->next;
> > }
> > @@ -2694,15 +2693,6 @@ static AcpiMcfgInfo *acpi_get_mcfg(void)
> > mcfg->mcfg_size = qnum_get_uint(qobject_to(QNum, o));
> > qobject_unref(o);
> >
> > - o = object_property_get_qobject(obj, PROP_PXB_BUS_NR, NULL);
> > - if (!o) {
> > - /* we are in q35 host again */
> > - mcfg->bus_nr = 0;
> > - } else {
> > - mcfg->bus_nr = qnum_get_uint(qobject_to(QNum, o));
> > - qobject_unref(o);
> > - }
> > -
> > pci_host = OBJECT(QTAILQ_NEXT(PCI_HOST_BRIDGE(pci_host), next));
> > }
> >
> > diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c
> > index 686b026..53f5776 100644
> > --- a/hw/pci-bridge/pci_expander_bridge.c
> > +++ b/hw/pci-bridge/pci_expander_bridge.c
> > @@ -91,7 +91,7 @@ static int pxb_bus_num(PCIBus *bus)
> > {
> > PXBDev *pxb = convert_to_pxb(bus->parent_dev);
> >
> > - return pxb->bus_nr;
> > + return pxb->domain_nr ? 0 : pxb->bus_nr;
> > }
> >
> > static int pxb_domain_num(PCIBus *bus)
> > @@ -145,8 +145,8 @@ static void pxb_pcie_foreach(gpointer data, gpointer user_data)
> >
> > if (pxb->domain_nr > 0) {
> > /* only reserve what users ask for to reduce memory cost. Plus one
> > - * as the interval [bus_nr, max_bus] has (max_bus-bus_nr+1) buses */
> > - pxb_mcfg_hole_size += ((pxb->max_bus - pxb->bus_nr + 1ULL) * MiB);
> > + * as the interval [0, max_bus] has (max_bus+1) buses */
> > + pxb_mcfg_hole_size += ((pxb->max_bus + 1ULL) * MiB);
> > }
> > }
> >
> > @@ -385,9 +385,9 @@ static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
> > /* will be overwritten by firmware, but kept for readability */
> > qdev_prop_set_uint64(ds, PCIE_HOST_MCFG_BASE,
> > pxb->domain_nr ? pxb_pcie_mcfg_base : MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
> > - /* +1 because [bus_nr, max_bus] has (max_bus-bus_nr+1) buses */
> > + /* +1 because [0, max_bus] has (max_bus+1) buses */
> > qdev_prop_set_uint64(ds, PCIE_HOST_MCFG_SIZE,
> > - pxb->domain_nr ? (pxb->max_bus - pxb->bus_nr + 1ULL) * MiB : 0);
> > + pxb->domain_nr ? (pxb->max_bus + 1ULL) * MiB : 0);
> > if (pxb->domain_nr)
> > pxb_pcie_mcfg_base += ((pxb->max_bus + 1ULL) * MiB);
> >
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-08-19 2:02 UTC | newest]
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2018-08-09 6:35 [Qemu-devel] [RFC v4 6/6] i386/acpi-build: pxb-pcie start bus should always be 0 in separate pci domain Zihan Yang
2018-08-17 17:54 ` Marcel Apfelbaum
2018-08-19 2:02 ` Zihan Yang
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