Re: [Xen-devel] [PATCH V2 03/10] arm/gic-v3: Fold GICR subtable parsing into a new function

[Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>]

On 06/27/2016 06:26 AM, Julien Grall wrote:
> Hi Shanker,
>
> Title: I think you want to say "Move GICR..." rather than "Fold GICR...".
>
> On 26/06/16 18:48, Shanker Donthineni wrote:
> > Add a new function for parsing GICR subtable and move the code
> Add a new function to parse GICR...
>
> > that is specific to GICR table to new function without changing
> to a new function
>
> > the function gicv3_acpi_init() behavior.
> >
> > Signed-off-by: Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>
> > ---
> > Changes since v1:
> >    Removed the unnecessary GICR ioremap operation inside GICR table
> parse code.
> >   xen/arch/arm/gic-v3.c | 61
> ++++++++++++++++++++++++++++++++-------------------
> >   1 file changed, 39 insertions(+), 22 deletions(-)
> >
> > diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
> > index 542c4f3..0471fea 100644
> > --- a/xen/arch/arm/gic-v3.c
> > +++ b/xen/arch/arm/gic-v3.c
> > @@ -1282,6 +1282,14 @@ static int gicv3_iomem_deny_access(const struct
> domain *d)
> >   }
> >
> >   #ifdef CONFIG_ACPI
> > +static void __init gic_acpi_add_rdist_region(u64 base_addr, u32 size)
> Please use paddr_t for both parameter. Also the suffix _addr is 
> pointless.
> > +{
> > +    unsigned int idx = gicv3.rdist_count++;
> > +
> > +    gicv3.rdist_regions[idx].base = base_addr;
> > +    gicv3.rdist_regions[idx].size = size;
> > +}
> > +
> >   static int gicv3_make_hwdom_madt(const struct domain *d, u32 offset)
> >   {
> >       struct acpi_subtable_header *header;
> > @@ -1387,6 +1395,25 @@ gic_acpi_parse_madt_distributor(struct
> acpi_subtable_header *header,
> >       return 0;
> >   }
> > +
> > +static int __init
> > +gic_acpi_parse_madt_redistributor(struct acpi_subtable_header *header,
> > +                                  const unsigned long end)
> > +{
> > +    struct acpi_madt_generic_redistributor *rdist;
> > +
> > +    rdist = (struct acpi_madt_generic_redistributor *)header;
> > +    if ( BAD_MADT_ENTRY(rdist, end) )
> > +        return -EINVAL;
> > +
> > +    if ( !rdist->base_address || !rdist->length )
> > +        return -EINVAL;
> In the commit message you said that the behavior is unchanged, however 
> this check is not part of the previous code.
> Anyway, I don't think this check is necessary.
>
> > +
> > +    gic_acpi_add_rdist_region(rdist->base_address, rdist->length);
> > +
> > +    return 0;
> > +}
> > +
> >   static int __init
> >   gic_acpi_get_madt_redistributor_num(struct acpi_subtable_header
> *header,
> > const unsigned long end)
> > @@ -1402,7 +1429,7 @@ static void __init gicv3_acpi_init(void)
> >       struct acpi_table_header *table;
> >       struct rdist_region *rdist_regs;
> >       acpi_status status;
> > -    int count, i;
> > +    int count;
> >
> >       status = acpi_get_table(ACPI_SIG_MADT, 0, &table);
> >
> > @@ -1433,37 +1460,27 @@ static void __init gicv3_acpi_init(void)
> >       if ( count <= 0 )
> >           panic("GICv3: No valid GICR entries exists");
> >
> > -    gicv3.rdist_count = count;
> > -
> > -    if ( gicv3.rdist_count > MAX_RDIST_COUNT )
> > +    if ( count > MAX_RDIST_COUNT )
> >           panic("GICv3: Number of redistributor regions is more than"
> >                 "%d (Increase MAX_RDIST_COUNT!!)\n", MAX_RDIST_COUNT);
> >
> > -    rdist_regs = xzalloc_array(struct rdist_region, gicv3.rdist_count);
> > +    rdist_regs = xzalloc_array(struct rdist_region, count);
> >       if ( !rdist_regs )
> >           panic("GICv3: Failed to allocate memory for rdist regions\n");
> >
> > -    for ( i = 0; i < gicv3.rdist_count; i++ )
> > -    {
> > -        struct acpi_subtable_header *header;
> > -        struct acpi_madt_generic_redistributor *gic_rdist;
> > -
> > -        header =
> acpi_table_get_entry_madt(ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
> > - i);
> > -        if ( !header )
> > -            panic("GICv3: Can't get GICR entry");
> > -
> > -        gic_rdist =
> > -           container_of(header, struct acpi_madt_generic_redistributor,
> header);
> > -        rdist_regs[i].base = gic_rdist->base_address;
> > -        rdist_regs[i].size = gic_rdist->length;
> > -    }
> > +    gicv3.rdist_regions = rdist_regs;
> > +
> > +    /* Parse always-on power domain Re-distributor entries */
> > +    count = acpi_parse_entries(ACPI_SIG_MADT,
> > +                               sizeof(struct acpi_table_madt),
> > + gic_acpi_parse_madt_redistributor,
> table,
> > + ACPI_MADT_TYPE_GENERIC_REDISTRIBUTOR,
> count);
>
> Please use acpi_table_parse_madt here.
How do we pass MADT table pointer that we are using to a function 
acpi_table_parse_madt()?  We have already obtained  the MADT table 
address by calling  acpi_get_table() at the beginning of the function 
gicv3_acpi_init().

> > +    if ( count <= 0 )
> > +        panic("GICv3: Can't get Redistributor entry");
> >
> >       /* The vGIC code requires the region to be sorted */
> >       sort(rdist_regs, gicv3.rdist_count, sizeof(*rdist_regs),
> cmp_rdist, NULL);
> > -    gicv3.rdist_regions= rdist_regs;
> > -
> >       /* Collect CPU base addresses */
> >       count = acpi_parse_entries(ACPI_SIG_MADT, sizeof(struct
> acpi_table_madt),
> > gic_acpi_parse_madt_cpu, table,
> Regards,
--
Shanker Donthineni
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux 
Foundation Collaborative Project


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