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Re: [kvm-unit-tests PATCH v7 08/13] arm/arm64: ITS: Device and collectio


From: Auger Eric
Subject: Re: [kvm-unit-tests PATCH v7 08/13] arm/arm64: ITS: Device and collection Initialization
Date: Wed, 25 Mar 2020 22:20:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

Hi Zenghui,

On 3/25/20 9:10 AM, Zenghui Yu wrote:
> Hi Eric,
> 
> On 2020/3/20 17:24, 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>
>>
>> ---
>>
>> v3 -> v4:
>> - remove unused its_baser variable from its_create_device()
>> - use get_order()
>> - device->itt becomes a GVA instead of GPA
>>
>> v2 -> v3:
>> - s/report_abort/assert
>>
>> v1 -> v2:
>> - s/nb_/nr_
>> ---
>>   lib/arm64/asm/gic-v3-its.h | 19 +++++++++++++++++++
>>   lib/arm64/gic-v3-its.c     | 38 ++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 57 insertions(+)
>>
>> diff --git a/lib/arm64/asm/gic-v3-its.h b/lib/arm64/asm/gic-v3-its.h
>> index 4683011..adcb642 100644
>> --- a/lib/arm64/asm/gic-v3-its.h
>> +++ b/lib/arm64/asm/gic-v3-its.h
>> @@ -31,6 +31,19 @@ struct its_baser {
>>   };
>>     #define GITS_BASER_NR_REGS        8
>> +#define GITS_MAX_DEVICES        8
>> +#define GITS_MAX_COLLECTIONS        8
>> +
>> +struct its_device {
>> +    u32 device_id;    /* device ID */
>> +    u32 nr_ites;    /* Max Interrupt Translation Entries */
>> +    void *itt;    /* Interrupt Translation Table GVA */
>> +};
>> +
>> +struct its_collection {
>> +    u64 target_address;
>> +    u16 col_id;
>> +};
>>     struct its_data {
>>       void *base;
>> @@ -39,6 +52,10 @@ struct its_data {
>>       struct its_baser coll_baser;
>>       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;
>> @@ -93,5 +110,7 @@ extern void its_parse_typer(void);
>>   extern void its_init(void);
>>   extern int its_baser_lookup(int i, struct its_baser *baser);
>>   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);
> 
> Maybe use 'u16 col_id'?
fair enough. At this point, not sure this is worth a respin though ;-)
> 
> Besides,
> Reviewed-by: Zenghui Yu <address@hidden>
Thanks!

Eric




> 
> 
> Thanks
> 
> 




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