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[SeaBIOS] [PATCH v3 2/2] pci: let firmware reserve IO for pcie-pci-bridge

Igor Mammedov posted 2 patches 3 years, 11 months ago
[SeaBIOS] [PATCH v3 2/2] pci: let firmware reserve IO for pcie-pci-bridge
Posted by Igor Mammedov 3 years, 11 months ago 
With [1] patch hotplug of rtl8139 succeeds, with caveat that it
fails to initialize IO bar, which is caused by [2] that makes
firmware skip IO reservation for any PCIe device, which isn't
correct in case of pcie-pci-bridge.
Fix it by exposing hotplug type and making IO resource optional
only if PCIe hotplug is in use.

[1]
 "pci: reserve resources for pcie-pci-bridge to fix regressed hotplug on q35"
[2]
Fixes: 76327b9f32a ("fw/pci: do not automatically allocate IO region for PCIe bridges")
Signed-off-by: Igor Mammedov imammedo@redhat.com
CC: mapfelba@redhat.com
CC: kraxel@redhat.com
CC: mst@redhat.com
CC: lvivier@redhat.com
CC: jusual@redhat.com
---
 src/fw/pciinit.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
index 7342d8d8..badf13d3 100644
--- a/src/fw/pciinit.c
+++ b/src/fw/pciinit.c
@@ -793,7 +793,13 @@ pci_region_create_entry(struct pci_bus *bus, struct pci_device *dev,
     return entry;
 }
 
-static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
+typedef enum hotplug_type_t {
+    HOTPLUG_NO_SUPPORTED = 0,
+    HOTPLUG_PCIE,
+    HOTPLUG_SHPC
+} hotplug_type_t;
+
+static hotplug_type_t pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
 {
     u8 shpc_cap;
 
@@ -819,12 +825,13 @@ static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
          */
         u16 slot_implemented = pcie_flags & PCI_EXP_FLAGS_SLOT;
 
-        return downstream_port && slot_implemented;
+        return downstream_port && slot_implemented ?
+            HOTPLUG_PCIE : HOTPLUG_NO_SUPPORTED;
     }
 
 check_shpc:
     shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
-    return !!shpc_cap;
+    return !!shpc_cap ? HOTPLUG_SHPC : HOTPLUG_NO_SUPPORTED;
 }
 
 /* Test whether bridge support forwarding of transactions
@@ -909,7 +916,7 @@ static int pci_bios_check_devices(struct pci_bus *busses)
         u8 pcie_cap = pci_find_capability(bdf, PCI_CAP_ID_EXP, 0);
         u8 qemu_cap = pci_find_resource_reserve_capability(bdf);
 
-        int hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
+        hotplug_type_t hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
         for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
             u64 align = (type == PCI_REGION_TYPE_IO) ?
                 PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN;
@@ -953,7 +960,9 @@ static int pci_bios_check_devices(struct pci_bus *busses)
             if (pci_region_align(&s->r[type]) > align)
                  align = pci_region_align(&s->r[type]);
             u64 sum = pci_region_sum(&s->r[type]);
-            int resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
+            int resource_optional = 0;
+            if (hotplug_support == HOTPLUG_PCIE)
+                resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
             if (!sum && hotplug_support && !resource_optional)
                 sum = align; /* reserve min size for hot-plug */
             if (size > sum) {
-- 
2.27.0

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[SeaBIOS] Re: [PATCH v3 2/2] pci: let firmware reserve IO for pcie-pci-bridge
Posted by Laurent Vivier 3 years, 11 months ago 
On 29/11/2021 12:48, Igor Mammedov wrote:
> With [1] patch hotplug of rtl8139 succeeds, with caveat that it
> fails to initialize IO bar, which is caused by [2] that makes
> firmware skip IO reservation for any PCIe device, which isn't
> correct in case of pcie-pci-bridge.
> Fix it by exposing hotplug type and making IO resource optional
> only if PCIe hotplug is in use.
> 
> [1]
>   "pci: reserve resources for pcie-pci-bridge to fix regressed hotplug on q35"
> [2]
> Fixes: 76327b9f32a ("fw/pci: do not automatically allocate IO region for PCIe bridges")
> Signed-off-by: Igor Mammedov imammedo@redhat.com
> CC: mapfelba@redhat.com
> CC: kraxel@redhat.com
> CC: mst@redhat.com
> CC: lvivier@redhat.com
> CC: jusual@redhat.com
> ---
>   src/fw/pciinit.c | 19 ++++++++++++++-----
>   1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
> index 7342d8d8..badf13d3 100644
> --- a/src/fw/pciinit.c
> +++ b/src/fw/pciinit.c
> @@ -793,7 +793,13 @@ pci_region_create_entry(struct pci_bus *bus, struct pci_device *dev,
>       return entry;
>   }
>   
> -static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
> +typedef enum hotplug_type_t {
> +    HOTPLUG_NO_SUPPORTED = 0,
> +    HOTPLUG_PCIE,
> +    HOTPLUG_SHPC
> +} hotplug_type_t;
> +
> +static hotplug_type_t pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
>   {
>       u8 shpc_cap;
>   
> @@ -819,12 +825,13 @@ static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
>            */
>           u16 slot_implemented = pcie_flags & PCI_EXP_FLAGS_SLOT;
>   
> -        return downstream_port && slot_implemented;
> +        return downstream_port && slot_implemented ?
> +            HOTPLUG_PCIE : HOTPLUG_NO_SUPPORTED;
>       }
>   
>   check_shpc:
>       shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
> -    return !!shpc_cap;
> +    return !!shpc_cap ? HOTPLUG_SHPC : HOTPLUG_NO_SUPPORTED;
>   }
>   
>   /* Test whether bridge support forwarding of transactions
> @@ -909,7 +916,7 @@ static int pci_bios_check_devices(struct pci_bus *busses)
>           u8 pcie_cap = pci_find_capability(bdf, PCI_CAP_ID_EXP, 0);
>           u8 qemu_cap = pci_find_resource_reserve_capability(bdf);
>   
> -        int hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
> +        hotplug_type_t hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
>           for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
>               u64 align = (type == PCI_REGION_TYPE_IO) ?
>                   PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN;
> @@ -953,7 +960,9 @@ static int pci_bios_check_devices(struct pci_bus *busses)
>               if (pci_region_align(&s->r[type]) > align)
>                    align = pci_region_align(&s->r[type]);
>               u64 sum = pci_region_sum(&s->r[type]);
> -            int resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
> +            int resource_optional = 0;
> +            if (hotplug_support == HOTPLUG_PCIE)
> +                resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
>               if (!sum && hotplug_support && !resource_optional)
>                   sum = align; /* reserve min size for hot-plug */
>               if (size > sum) {
> 

Tested-by: Laurent Vivier <lvivier@redhat.com>

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[SeaBIOS] Re: [PATCH v3 2/2] pci: let firmware reserve IO for pcie-pci-bridge
Posted by Michael S. Tsirkin 3 years, 11 months ago 
On Mon, Nov 29, 2021 at 06:48:12AM -0500, Igor Mammedov wrote:
> With [1] patch hotplug of rtl8139 succeeds, with caveat that it
> fails to initialize IO bar, which is caused by [2] that makes
> firmware skip IO reservation for any PCIe device, which isn't
> correct in case of pcie-pci-bridge.
> Fix it by exposing hotplug type and making IO resource optional
> only if PCIe hotplug is in use.
> 
> [1]
>  "pci: reserve resources for pcie-pci-bridge to fix regressed hotplug on q35"
> [2]
> Fixes: 76327b9f32a ("fw/pci: do not automatically allocate IO region for PCIe bridges")
> Signed-off-by: Igor Mammedov imammedo@redhat.com
> CC: mapfelba@redhat.com
> CC: kraxel@redhat.com
> CC: mst@redhat.com
> CC: lvivier@redhat.com
> CC: jusual@redhat.com

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  src/fw/pciinit.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
> index 7342d8d8..badf13d3 100644
> --- a/src/fw/pciinit.c
> +++ b/src/fw/pciinit.c
> @@ -793,7 +793,13 @@ pci_region_create_entry(struct pci_bus *bus, struct pci_device *dev,
>      return entry;
>  }
>  
> -static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
> +typedef enum hotplug_type_t {
> +    HOTPLUG_NO_SUPPORTED = 0,
> +    HOTPLUG_PCIE,
> +    HOTPLUG_SHPC
> +} hotplug_type_t;
> +
> +static hotplug_type_t pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
>  {
>      u8 shpc_cap;
>  
> @@ -819,12 +825,13 @@ static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
>           */
>          u16 slot_implemented = pcie_flags & PCI_EXP_FLAGS_SLOT;
>  
> -        return downstream_port && slot_implemented;
> +        return downstream_port && slot_implemented ?
> +            HOTPLUG_PCIE : HOTPLUG_NO_SUPPORTED;
>      }
>  
>  check_shpc:
>      shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
> -    return !!shpc_cap;
> +    return !!shpc_cap ? HOTPLUG_SHPC : HOTPLUG_NO_SUPPORTED;
>  }
>  
>  /* Test whether bridge support forwarding of transactions
> @@ -909,7 +916,7 @@ static int pci_bios_check_devices(struct pci_bus *busses)
>          u8 pcie_cap = pci_find_capability(bdf, PCI_CAP_ID_EXP, 0);
>          u8 qemu_cap = pci_find_resource_reserve_capability(bdf);
>  
> -        int hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
> +        hotplug_type_t hotplug_support = pci_bus_hotplug_support(s, pcie_cap);
>          for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) {
>              u64 align = (type == PCI_REGION_TYPE_IO) ?
>                  PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN;
> @@ -953,7 +960,9 @@ static int pci_bios_check_devices(struct pci_bus *busses)
>              if (pci_region_align(&s->r[type]) > align)
>                   align = pci_region_align(&s->r[type]);
>              u64 sum = pci_region_sum(&s->r[type]);
> -            int resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
> +            int resource_optional = 0;
> +            if (hotplug_support == HOTPLUG_PCIE)
> +                resource_optional = pcie_cap && (type == PCI_REGION_TYPE_IO);
>              if (!sum && hotplug_support && !resource_optional)
>                  sum = align; /* reserve min size for hot-plug */
>              if (size > sum) {
> -- 
> 2.27.0

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[SeaBIOS] Re: [PATCH v3 2/2] pci: let firmware reserve IO for pcie-pci-bridge
Posted by Peter Stuge 3 years, 11 months ago 
Igor Mammedov wrote:
> +++ b/src/fw/pciinit.c
..
> @@ -819,12 +825,13 @@ static int pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
>           */
>          u16 slot_implemented = pcie_flags & PCI_EXP_FLAGS_SLOT;
>  
> -        return downstream_port && slot_implemented;
> +        return downstream_port && slot_implemented ?
> +            HOTPLUG_PCIE : HOTPLUG_NO_SUPPORTED;
>      }
>  
>  check_shpc:
>      shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
> -    return !!shpc_cap;
> +    return !!shpc_cap ? HOTPLUG_SHPC : HOTPLUG_NO_SUPPORTED;

Maybe remove !! here.


//Peter
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