Commit 3171a47a authored by Marc Zyngier's avatar Marc Zyngier

irqchip/gic-v3-its: Add VPE affinity changes

When we're about to run a vcpu, it is crucial that the redistributor
associated with the physical CPU is being told about the new residency.

This is abstracted by hijacking the irq_set_affinity method for the
doorbell interrupt associated with the VPE. It is expected that the
hypervisor will call this method before scheduling the VPE.
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 5e2f7642
......@@ -148,6 +148,9 @@ static struct irq_domain *its_parent;
#define ITS_LIST_MAX 16
static unsigned long its_list_map;
static u16 vmovp_seq_num;
static DEFINE_RAW_SPINLOCK(vmovp_lock);
static DEFINE_IDA(its_vpeid_ida);
#define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist))
......@@ -238,6 +241,13 @@ struct its_cmd_desc {
u32 event_id;
bool db_enabled;
} its_vmovi_cmd;
struct {
struct its_vpe *vpe;
struct its_collection *col;
u16 seq_num;
u16 its_list;
} its_vmovp_cmd;
};
};
......@@ -329,6 +339,16 @@ static void its_encode_db_valid(struct its_cmd_block *cmd, bool db_valid)
its_mask_encode(&cmd->raw_cmd[2], db_valid, 0, 0);
}
static void its_encode_seq_num(struct its_cmd_block *cmd, u16 seq_num)
{
its_mask_encode(&cmd->raw_cmd[0], seq_num, 47, 32);
}
static void its_encode_its_list(struct its_cmd_block *cmd, u16 its_list)
{
its_mask_encode(&cmd->raw_cmd[1], its_list, 15, 0);
}
static void its_encode_vpt_addr(struct its_cmd_block *cmd, u64 vpt_pa)
{
its_mask_encode(&cmd->raw_cmd[3], vpt_pa >> 16, 50, 16);
......@@ -571,6 +591,20 @@ static struct its_vpe *its_build_vmovi_cmd(struct its_cmd_block *cmd,
return desc->its_vmovi_cmd.vpe;
}
static struct its_vpe *its_build_vmovp_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
its_encode_cmd(cmd, GITS_CMD_VMOVP);
its_encode_seq_num(cmd, desc->its_vmovp_cmd.seq_num);
its_encode_its_list(cmd, desc->its_vmovp_cmd.its_list);
its_encode_vpeid(cmd, desc->its_vmovp_cmd.vpe->vpe_id);
its_encode_target(cmd, desc->its_vmovp_cmd.col->target_address);
its_fixup_cmd(cmd);
return desc->its_vmovp_cmd.vpe;
}
static u64 its_cmd_ptr_to_offset(struct its_node *its,
struct its_cmd_block *ptr)
{
......@@ -871,6 +905,48 @@ static void its_send_vmapp(struct its_vpe *vpe, bool valid)
}
}
static void its_send_vmovp(struct its_vpe *vpe)
{
struct its_cmd_desc desc;
struct its_node *its;
unsigned long flags;
int col_id = vpe->col_idx;
desc.its_vmovp_cmd.vpe = vpe;
desc.its_vmovp_cmd.its_list = (u16)its_list_map;
if (!its_list_map) {
its = list_first_entry(&its_nodes, struct its_node, entry);
desc.its_vmovp_cmd.seq_num = 0;
desc.its_vmovp_cmd.col = &its->collections[col_id];
its_send_single_vcommand(its, its_build_vmovp_cmd, &desc);
return;
}
/*
* Yet another marvel of the architecture. If using the
* its_list "feature", we need to make sure that all ITSs
* receive all VMOVP commands in the same order. The only way
* to guarantee this is to make vmovp a serialization point.
*
* Wall <-- Head.
*/
raw_spin_lock_irqsave(&vmovp_lock, flags);
desc.its_vmovp_cmd.seq_num = vmovp_seq_num++;
/* Emit VMOVPs */
list_for_each_entry(its, &its_nodes, entry) {
if (!its->is_v4)
continue;
desc.its_vmovp_cmd.col = &its->collections[col_id];
its_send_single_vcommand(its, its_build_vmovp_cmd, &desc);
}
raw_spin_unlock_irqrestore(&vmovp_lock, flags);
}
static void its_send_vinvall(struct its_vpe *vpe)
{
struct its_cmd_desc desc;
......@@ -2154,6 +2230,25 @@ static const struct irq_domain_ops its_domain_ops = {
.deactivate = its_irq_domain_deactivate,
};
static int its_vpe_set_affinity(struct irq_data *d,
const struct cpumask *mask_val,
bool force)
{
struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
int cpu = cpumask_first(mask_val);
/*
* Changing affinity is mega expensive, so let's be as lazy as
* we can and only do it if we really have to.
*/
if (vpe->col_idx != cpu) {
vpe->col_idx = cpu;
its_send_vmovp(vpe);
}
return IRQ_SET_MASK_OK_DONE;
}
static void its_vpe_schedule(struct its_vpe *vpe)
{
void * __iomem vlpi_base = gic_data_rdist_vlpi_base();
......@@ -2243,6 +2338,7 @@ static int its_vpe_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
static struct irq_chip its_vpe_irq_chip = {
.name = "GICv4-vpe",
.irq_set_affinity = its_vpe_set_affinity,
.irq_set_vcpu_affinity = its_vpe_set_vcpu_affinity,
};
......
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