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irqchip/gic-v3-its: Refactor command encoding 

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. It also has the advantage of expressing the encoding in
a way that matches the architecture specification.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-12-19 17:11:52 +00:00
parent 2fd632a003
commit 4d36f136d5
1 changed files with 16 additions and 18 deletions
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34
drivers/irqchip/irq-gic-v3-its.c
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@ -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);
}
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)