On Fri, Jan 10, 2020 at 03:54:04PM +0100, Eric Auger wrote:
> Allocate the command queue and initialize related registers:
> CBASER, CREADR, CWRITER.
>
> The command queue is 64kB. This aims at not bothing with fullness.
I think these means that the goal isn't completeness? If so, please
write "minimal implementation" or nothing, as all of kvm-unit-tests
is a minimal implementation.
>
> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
>
> ---
>
> v2 -> v3:
> - removed readr
> ---
> lib/arm/asm/gic-v3-its.h | 6 ++++++
> lib/arm/gic-v3-its.c | 22 ++++++++++++++++++++++
> 2 files changed, 28 insertions(+)
>
> diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h
> index 2f8b8f1..93814f7 100644
> --- a/lib/arm/asm/gic-v3-its.h
> +++ b/lib/arm/asm/gic-v3-its.h
> @@ -75,10 +75,16 @@ struct its_baser {
> int esz;
> };
>
> +struct its_cmd_block {
> + u64 raw_cmd[4];
Do we need these spaces (not even a tab) after the u64?
> +};
> +
> 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;
> };
>
> extern struct its_data its_data;
> diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c
> index 6c97569..3037c84 100644
> --- a/lib/arm/gic-v3-its.c
> +++ b/lib/arm/gic-v3-its.c
> @@ -177,3 +177,25 @@ void set_pending_table_bit(int rdist, int n, bool set)
> byte &= ~mask;
> *ptr = byte;
> }
> +
> +/**
> + * init_cmd_queue: Allocate the command queue and initialize
> + * CBASER, CREADR, CWRITER
> + */
> +void init_cmd_queue(void);
> +void init_cmd_queue(void)
its_cmd_queue_init
> +{
> + unsigned long n = SZ_64K >> PAGE_SHIFT;
> + unsigned long order = fls(n);
> + u64 cbaser;
> +
> + its_data.cmd_base = (void *)virt_to_phys(alloc_pages(order));
> +
> + cbaser = ((u64)its_data.cmd_base | (SZ_64K / SZ_4K - 1) |
> + GITS_CBASER_VALID);
120 chars
> +
> + writeq(cbaser, its_data.base + GITS_CBASER);
> +
> + its_data.cmd_write = its_data.cmd_base;
> + writeq(0, its_data.base + GITS_CWRITER);
> +}
> --
> 2.20.1
>
Thanks,
drew
