Re: [Qemu-devel] [RFC PATCH 1/3] hw/arm/virt-acpi-build: use acpi_get_mcfg() to calculate bus number

[Wei Yang]

On Wed, Mar 13, 2019 at 01:00:22PM +0100, Igor Mammedov wrote:
>On Wed, 13 Mar 2019 12:42:51 +0800
>Wei Yang <address@hidden> wrote:
>
>> To build MCFG, two information is necessary:
>> 
>>     * bus number
>>     * base address
>> 
>> Abstract these two information to AcpiMcfgInfo so that build_mcfg and
>> build_mcfg_q35 will have the same declaration.
>> 
>> Signed-off-by: Wei Yang <address@hidden>
>> ---
>>  hw/arm/virt-acpi-build.c    | 28 ++++++++++++++++++++--------
>>  hw/i386/acpi-build.c        |  5 -----
>>  include/hw/acpi/aml-build.h |  5 +++++
>>  3 files changed, 25 insertions(+), 13 deletions(-)
>> 
>> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
>> index 57679a89bf..7713c2d809 100644
>> --- a/hw/arm/virt-acpi-build.c
>> +++ b/hw/arm/virt-acpi-build.c
>> @@ -545,23 +545,32 @@ build_srat(GArray *table_data, BIOSLinker *linker, 
>> VirtMachineState *vms)
>>                   "SRAT", table_data->len - srat_start, 3, NULL, NULL);
>>  }
>>  
>> -static void
>> -build_mcfg(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>> +static bool acpi_get_mcfg(AcpiMcfgInfo *mcfg)
>>  {
>> -    AcpiTableMcfg *mcfg;
>> +    VirtMachineState *vms = VIRT_MACHINE(qdev_get_machine());
>>      const MemMapEntry *memmap = vms->memmap;
>>      int ecam_id = VIRT_ECAM_ID(vms->highmem_ecam);
>> +
>> +    mcfg->mcfg_base = memmap[ecam_id].base;
>> +    mcfg->mcfg_size = memmap[ecam_id].size;
>> +
>> +    return true;
>> +}
>> +
>> +static void
>> +build_mcfg(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info)
>> +{
>> +    AcpiTableMcfg *mcfg;
>>      int len = sizeof(*mcfg) + sizeof(mcfg->allocation[0]);
>>      int mcfg_start = table_data->len;
>>  
>>      mcfg = acpi_data_push(table_data, len);
>> -    mcfg->allocation[0].address = cpu_to_le64(memmap[ecam_id].base);
>> +    mcfg->allocation[0].address = cpu_to_le64(info->mcfg_base);
>>  
>>      /* Only a single allocation so no need to play with segments */
>>      mcfg->allocation[0].pci_segment = cpu_to_le16(0);
>>      mcfg->allocation[0].start_bus_number = 0;
>> -    mcfg->allocation[0].end_bus_number =
>> -        PCIE_MMCFG_BUS(memmap[ecam_id].size - 1);
>> +    mcfg->allocation[0].end_bus_number = PCIE_MMCFG_BUS(info->mcfg_size - 
>> 1);
>>  
>>      build_header(linker, table_data, (void *)(table_data->data + 
>> mcfg_start),
>>                   "MCFG", table_data->len - mcfg_start, 1, NULL, NULL);
>> @@ -779,6 +788,7 @@ void virt_acpi_build(VirtMachineState *vms, 
>> AcpiBuildTables *tables)
>>      VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(vms);
>>      GArray *table_offsets;
>>      unsigned dsdt, xsdt;
>> +    AcpiMcfgInfo mcfg;
>>      GArray *tables_blob = tables->table_data;
>>  
>>      table_offsets = g_array_new(false, true /* clear */,
>> @@ -802,8 +812,10 @@ void virt_acpi_build(VirtMachineState *vms, 
>> AcpiBuildTables *tables)
>>      acpi_add_table(table_offsets, tables_blob);
>>      build_gtdt(tables_blob, tables->linker, vms);
>>  
>> -    acpi_add_table(table_offsets, tables_blob);
>> -    build_mcfg(tables_blob, tables->linker, vms);
>> +    if ( acpi_get_mcfg(&mcfg)) {
>> +        acpi_add_table(table_offsets, tables_blob);
>> +        build_mcfg(tables_blob, tables->linker, &mcfg);
>> +    }
>
>acpi_get_mcfg used only once and always true so one doesn't need condition
>I'd go for simpler:
>
>diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
>index d7e2e4885b..a28e04c249 100644
>--- a/hw/arm/virt-acpi-build.c
>+++ b/hw/arm/virt-acpi-build.c
>@@ -803,8 +803,13 @@ void virt_acpi_build(VirtMachineState *vms, 
>AcpiBuildTables *tables)
>     build_gtdt(tables_blob, tables->linker, vms);
> 
>     acpi_add_table(table_offsets, tables_blob);
>-    build_mcfg(tables_blob, tables->linker, vms);
>-
>+    {
>+        const AcpiTableMcfg mcfg = {
>+           .mcfg_base = vms->memmap[VIRT_ECAM_ID(vms->highmem_ecam)].base;
>+           .mcfg_size = vms->memmap[VIRT_ECAM_ID(vms->highmem_ecam)].size;
>+        };
>+        build_mcfg(tables_blob, tables->linker, &mcfg);
>+    }
>     acpi_add_table(table_offsets, tables_blob);
>     build_spcr(tables_blob, tables->linker, vms);
>
>and get rid of acpi_get_mcfg() helper function
>

That's reasonable.

>>      acpi_add_table(table_offsets, tables_blob);
>>      build_spcr(tables_blob, tables->linker, vms);
>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
>> index 9ecc96dcc7..c5b1c3be99 100644
>> --- a/hw/i386/acpi-build.c
>> +++ b/hw/i386/acpi-build.c
>> @@ -86,11 +86,6 @@
>>  /* Default IOAPIC ID */
>>  #define ACPI_BUILD_IOAPIC_ID 0x0
>>  
>> -typedef struct AcpiMcfgInfo {
>> -    uint64_t mcfg_base;
>> -    uint32_t mcfg_size;
>> -} AcpiMcfgInfo;
>> -
>>  typedef struct AcpiPmInfo {
>>      bool s3_disabled;
>>      bool s4_disabled;
>> diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
>> index 1a563ad756..b63b85d67c 100644
>> --- a/include/hw/acpi/aml-build.h
>> +++ b/include/hw/acpi/aml-build.h
>> @@ -223,6 +223,11 @@ struct AcpiBuildTables {
>>      BIOSLinker *linker;
>>  } AcpiBuildTables;
>>  
>> +typedef struct AcpiMcfgInfo {
>> +    uint64_t mcfg_base;
>> +    uint32_t mcfg_size;
>mcfg_ prefix in fields probably isn't necessary.
>

Hmm... I may split this to another patch to address.

>> +} AcpiMcfgInfo;
>> +
>>  /**
>>   * init_aml_allocator:
>>   *
>

-- 
Wei Yang
Help you, Help me