Re: [PATCH v5 12/22] arm/acpi: Prepare EFI memory descriptor for Dom0

[Stefano Stabellini <stefano.stabellini@eu.citrix.com>]

On Fri, 4 Mar 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@linaro.org>
> 
> Create a few EFI memory descriptors to tell Dom0 the RAM region
> information, ACPI table regions and EFI tables reserved resions.
> 
> Signed-off-by: Parth Dixit <parth.dixit@linaro.org>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> ---
> v5: move to efi-dom0.c
> ---
>  xen/arch/arm/domain_build.c |  2 ++
>  xen/arch/arm/efi/efi-dom0.c | 47 +++++++++++++++++++++++++++++++++++++++++++++
>  xen/include/asm-arm/setup.h |  5 +++++
>  3 files changed, 54 insertions(+)
> 
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 613551c..008fc76 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1688,6 +1688,8 @@ static int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
>      acpi_map_other_tables(d);
>      acpi_create_efi_system_table(d->arch.efi_acpi_gpa, d->arch.efi_acpi_table,
>                                   tbl_add);
> +    acpi_create_efi_mmap_table(d->arch.efi_acpi_gpa, d->arch.efi_acpi_len,
> +                               d->arch.efi_acpi_table, &kinfo->mem, tbl_add);
>  
>      return 0;
>  }
> diff --git a/xen/arch/arm/efi/efi-dom0.c b/xen/arch/arm/efi/efi-dom0.c
> index 36a1283..0ff6309 100644
> --- a/xen/arch/arm/efi/efi-dom0.c
> +++ b/xen/arch/arm/efi/efi-dom0.c
> @@ -22,6 +22,7 @@
>   */
>  
>  #include "efi.h"
> +#include <xen/pfn.h>
>  #include <asm/setup.h>
>  #include <asm/acpi.h>
>  
> @@ -90,3 +91,49 @@ void __init acpi_create_efi_system_table(paddr_t paddr, void *efi_acpi_table,
>      tbl_add[TBL_EFIT].start = table_addr;
>      tbl_add[TBL_EFIT].size = table_size;
>  }
> +
> +void __init acpi_create_efi_mmap_table(paddr_t paddr, paddr_t size,
> +                                       void *efi_acpi_table,
> +                                       const struct meminfo *mem,
> +                                       struct membank tbl_add[])
> +{
> +    EFI_MEMORY_DESCRIPTOR *memory_map;
> +    struct meminfo *acpi_mem;
> +    int acpi_mem_nr_banks = 0;
> +    unsigned int i, offset;
> +    u8 *base_ptr;
> +
> +    base_ptr = efi_acpi_table + acpi_get_table_offset(tbl_add, TBL_MMAP);
> +    memory_map = (EFI_MEMORY_DESCRIPTOR *)(base_ptr);
> +
> +    offset = 0;
> +    for( i = 0; i < mem->nr_banks; i++, offset++ )
> +    {
> +        memory_map[offset].Type = EfiConventionalMemory;
> +        memory_map[offset].PhysicalStart = mem->bank[i].start;
> +        memory_map[offset].NumberOfPages = PFN_UP(mem->bank[i].size);
> +        memory_map[offset].Attribute = EFI_MEMORY_WB;
> +    }
> +
> +    if ( !acpi_disabled )
> +    {

Isn't this check redundant, givem that the function is name is
acpi_create_efi_mmap_table and is called by prepare_acpi?


> +        acpi_mem = get_acpi_meminfo();

Would it be possible to call get_acpi_meminfo from prepare_acpi and pass
acpi_mem to this function?


> +        acpi_mem_nr_banks = acpi_mem->nr_banks;
> +        for( i = 0; i < acpi_mem_nr_banks; i++, offset++ )
> +        {
> +            memory_map[offset].Type = EfiACPIReclaimMemory;
> +            memory_map[offset].PhysicalStart = acpi_mem->bank[i].start;
> +            memory_map[offset].NumberOfPages = PFN_UP(acpi_mem->bank[i].size);
> +            memory_map[offset].Attribute = EFI_MEMORY_WB;
> +        }
> +    }
> +
> +    memory_map[offset].Type = EfiACPIReclaimMemory;
> +    memory_map[offset].PhysicalStart = paddr;
> +    memory_map[offset].NumberOfPages = PFN_UP(size);
> +    memory_map[offset].Attribute = EFI_MEMORY_WB;
> +
> +    tbl_add[TBL_MMAP].start = paddr + acpi_get_table_offset(tbl_add, TBL_MMAP);
> +    tbl_add[TBL_MMAP].size = sizeof(EFI_MEMORY_DESCRIPTOR)
> +                             * (mem->nr_banks + acpi_mem_nr_banks + 1);
> +}
> diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
> index e423b15..b2899f2 100644
> --- a/xen/include/asm-arm/setup.h
> +++ b/xen/include/asm-arm/setup.h
> @@ -56,6 +56,11 @@ size_t estimate_efi_size(int mem_nr_banks);
>  void acpi_create_efi_system_table(paddr_t paddr, void *efi_acpi_table,
>                                    struct membank tbl_add[]);
>  
> +void acpi_create_efi_mmap_table(paddr_t paddr, paddr_t size,
> +                                void *efi_acpi_table,
> +                                const struct meminfo *mem,
> +                                struct membank tbl_add[]);
> +
>  int construct_dom0(struct domain *d);
>  
>  void discard_initial_modules(void);
> -- 
> 2.0.4
> 
> 

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