Re: [kvm-unit-tests PATCH v2 11/16] arm/arm64: ITS: Device and collection Initialization

[Andrew Jones]

On Fri, Jan 10, 2020 at 03:54:07PM +0100, Eric Auger wrote:
> Introduce an helper functions to register
> - a new device, characterized by its device id and the
>   max number of event IDs that dimension its ITT (Interrupt
>   Translation Table).  The function allocates the ITT.
> 
> - a new collection, characterized by its ID and the
>   target processing engine (PE).
> 
> Signed-off-by: Eric Auger <address@hidden>
> 
> ---
> 
> v2 -> v3:
> - s/nb_/nr_
> ---
>  lib/arm/asm/gic-v3-its.h | 20 +++++++++++++++++
>  lib/arm/gic-v3-its.c     | 46 ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 66 insertions(+)
> 
> diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h
> index 0e31848..0497a78 100644
> --- a/lib/arm/asm/gic-v3-its.h
> +++ b/lib/arm/asm/gic-v3-its.h
> @@ -55,6 +55,9 @@
>  #define GITS_BASER_TYPE_DEVICE               1
>  #define GITS_BASER_TYPE_COLLECTION   4
>  
> +#define GITS_MAX_DEVICES             8
> +#define GITS_MAX_COLLECTIONS         8
> +
>  struct its_typer {
>       unsigned int ite_size;
>       unsigned int eventid_bits;
> @@ -79,12 +82,27 @@ struct its_cmd_block {
>       u64     raw_cmd[4];
>  };
>  
> +struct its_device {
> +     u32 device_id;  /* device ID */
> +     u32 nr_ites;    /* Max Interrupt Translation Entries */
> +     void *itt;      /* Interrupt Translation Table GPA */
> +};
> +
> +struct its_collection {
> +     u64 target_address;
> +     u16 col_id;
> +};
> +
>  struct its_data {
>       void *base;
>       struct its_typer typer;
>       struct its_baser baser[GITS_BASER_NR_REGS];
>       struct its_cmd_block *cmd_base;
>       struct its_cmd_block *cmd_write;
> +     struct its_device devices[GITS_MAX_DEVICES];
> +     u32 nr_devices;         /* Allocated Devices */
> +     struct its_collection collections[GITS_MAX_COLLECTIONS];
> +     u32 nr_collections;     /* Allocated Collections */
>  };
>  
>  extern struct its_data its_data;
> @@ -101,6 +119,8 @@ extern u8 get_lpi_config(int n);
>  extern void set_pending_table_bit(int rdist, int n, bool set);
>  extern void gicv3_rdist_ctrl_lpi(u32 redist, bool set);
>  extern void its_enable_defaults(void);
> +extern struct its_device *its_create_device(u32 dev_id, int nr_ites);
> +extern struct its_collection *its_create_collection(u32 col_id, u32 
> target_pe);
>  
>  #endif /* !__ASSEMBLY__ */
>  #endif /* _ASMARM_GIC_V3_ITS_H_ */
> diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c
> index f488cca..88c08ee 100644
> --- a/lib/arm/gic-v3-its.c
> +++ b/lib/arm/gic-v3-its.c
> @@ -257,3 +257,49 @@ void its_enable_defaults(void)
>  
>       writel(GITS_CTLR_ENABLE, its_data.base + GITS_CTLR);
>  }
> +
> +struct its_device *its_create_device(u32 device_id, int nr_ites)
> +{
> +     struct its_baser *baser;
> +     struct its_device *new;
> +     unsigned long n, order;
> +
> +     if (its_data.nr_devices >= GITS_MAX_DEVICES)
> +             report_abort("%s redimension GITS_MAX_DEVICES", __func__);
> +
> +     baser = its_lookup_baser(GITS_BASER_TYPE_DEVICE);
> +     if (!baser)
> +             return NULL;
> +
> +     new = &its_data.devices[its_data.nr_devices];
> +
> +     new->device_id = device_id;
> +     new->nr_ites = nr_ites;
> +
> +     n = (its_data.typer.ite_size * nr_ites) >> PAGE_SHIFT;
> +     order = is_power_of_2(n) ? fls(n) : fls(n) + 1;
> +     new->itt = (void *)virt_to_phys(alloc_pages(order));
> +
> +     its_data.nr_devices++;
> +     return new;
> +}
> +
> +struct its_collection *its_create_collection(u32 col_id, u32 pe)
> +{
> +     struct its_collection *new;
> +
> +     if (its_data.nr_collections >= GITS_MAX_COLLECTIONS)
> +             report_abort("%s redimension GITS_MAX_COLLECTIONS", __func__);
> +
> +     new = &its_data.collections[its_data.nr_collections];
> +
> +     new->col_id = col_id;
> +
> +     if (its_data.typer.pta)
> +             new->target_address = (u64)gicv3_data.redist_base[pe];
> +     else
> +             new->target_address = pe << 16;
> +
> +     its_data.nr_collections++;
> +     return new;
> +}
> -- 
> 2.20.1
>

Please replace the if (cond) report_abort(...)'s with assert_msg(cond, ...)'s.

Thanks,
drew