On 17/01/2017 11:20, Marc Zyngier wrote:
> The way we encode the various ITS command fields is both tedious
> and error prone. Let's introduce a helper function that performs
> the encoding, and convert the existing encoders to use that
> helper.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> drivers/irqchip/irq-gic-v3-its.c | 34 ++++++++++++++++------------------
> 1 file changed, 16 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 69b040f..49b681e 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -193,58 +193,56 @@ struct its_cmd_block {
> typedef struct its_collection *(*its_cmd_builder_t)(struct its_cmd_block *,
> struct its_cmd_desc *);
>
> +static void its_mask_encode(u64 *raw_cmd, u64 val, int h, int l)
> +{
> + u64 mask = GENMASK_ULL(h, l);
> + *raw_cmd &= ~mask;
> + *raw_cmd |= (val << l) & mask;
> +}
> +
> static void its_encode_cmd(struct its_cmd_block *cmd, u8 cmd_nr)
> {
> - cmd->raw_cmd[0] &= ~0xffULL;
> - cmd->raw_cmd[0] |= cmd_nr;
> + its_mask_encode(&cmd->raw_cmd[0], cmd_nr, 7, 0);
> }
>
> static void its_encode_devid(struct its_cmd_block *cmd, u32 devid)
> {
> - cmd->raw_cmd[0] &= BIT_ULL(32) - 1;
> - cmd->raw_cmd[0] |= ((u64)devid) << 32;
> + its_mask_encode(&cmd->raw_cmd[0], devid, 63, 32);
> }
>
> static void its_encode_event_id(struct its_cmd_block *cmd, u32 id)
> {
> - cmd->raw_cmd[1] &= ~0xffffffffULL;
> - cmd->raw_cmd[1] |= id;
> + its_mask_encode(&cmd->raw_cmd[1], id, 31, 0);
> }
>
> static void its_encode_phys_id(struct its_cmd_block *cmd, u32 phys_id)
> {
> - cmd->raw_cmd[1] &= 0xffffffffULL;
> - cmd->raw_cmd[1] |= ((u64)phys_id) << 32;
> + its_mask_encode(&cmd->raw_cmd[1], phys_id, 63, 32);
> }
>
> static void its_encode_size(struct its_cmd_block *cmd, u8 size)
> {
> - cmd->raw_cmd[1] &= ~0x1fULL;
> - cmd->raw_cmd[1] |= size & 0x1f;
> + its_mask_encode(&cmd->raw_cmd[1], size, 4, 0);
> }
>
> static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr)
> {
> - cmd->raw_cmd[2] &= ~0xffffffffffffULL;
> - cmd->raw_cmd[2] |= itt_addr & 0xffffffffff00ULL;
> + its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 50, 8);
> }
>
> static void its_encode_valid(struct its_cmd_block *cmd, int valid)
> {
> - cmd->raw_cmd[2] &= ~(1ULL << 63);
> - cmd->raw_cmd[2] |= ((u64)!!valid) << 63;
> + its_mask_encode(&cmd->raw_cmd[2], !!valid, 63, 63);
> }
>
> static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr)
> {
> - cmd->raw_cmd[2] &= ~(0xffffffffULL << 16);
> - cmd->raw_cmd[2] |= (target_addr & (0xffffffffULL << 16));
> + its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 50, 16);
Theoretically isn't it 16:51? In the previous code this was encoded as
16-47 I think.
Besides
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Thanks
Eric
> }
>
> static void its_encode_collection(struct its_cmd_block *cmd, u16 col)
> {
> - cmd->raw_cmd[2] &= ~0xffffULL;
> - cmd->raw_cmd[2] |= col;
> + its_mask_encode(&cmd->raw_cmd[2], col, 15, 0);
> }
>
> static inline void its_fixup_cmd(struct its_cmd_block *cmd)
>
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