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irqchip/gic-v3-its: Add VPE irq domain [de]activation 

On activation, a VPE is mapped using the VMAPP command, followed
by a VINVALL for a good measure. On deactivation, the VPE is
simply unmapped.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-12-20 14:47:05 +00:00
parent 7d75bbb4bc
commit eb78192be2
1 changed files with 102 additions and 0 deletions
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102
drivers/irqchip/irq-gic-v3-its.c
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@ -213,6 +213,16 @@ struct its_cmd_desc {
struct its_collection *col;
} its_invall_cmd;
struct {
struct its_vpe *vpe;
} its_vinvall_cmd;
struct {
struct its_vpe *vpe;
struct its_collection *col;
bool valid;
} its_vmapp_cmd;
struct {
struct its_vpe *vpe;
struct its_device *dev;
@ -318,6 +328,16 @@ 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_vpt_addr(struct its_cmd_block *cmd, u64 vpt_pa)
{
its_mask_encode(&cmd->raw_cmd[3], vpt_pa >> 16, 50, 16);
}
static void its_encode_vpt_size(struct its_cmd_block *cmd, u8 vpt_size)
{
its_mask_encode(&cmd->raw_cmd[3], vpt_size, 4, 0);
}
static inline void its_fixup_cmd(struct its_cmd_block *cmd)
{
/* Let's fixup BE commands */
@ -476,6 +496,36 @@ static struct its_collection *its_build_invall_cmd(struct its_cmd_block *cmd,
return NULL;
}
static struct its_vpe *its_build_vinvall_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
its_encode_cmd(cmd, GITS_CMD_VINVALL);
its_encode_vpeid(cmd, desc->its_vinvall_cmd.vpe->vpe_id);
its_fixup_cmd(cmd);
return desc->its_vinvall_cmd.vpe;
}
static struct its_vpe *its_build_vmapp_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
unsigned long vpt_addr;
vpt_addr = virt_to_phys(page_address(desc->its_vmapp_cmd.vpe->vpt_page));
its_encode_cmd(cmd, GITS_CMD_VMAPP);
its_encode_vpeid(cmd, desc->its_vmapp_cmd.vpe->vpe_id);
its_encode_valid(cmd, desc->its_vmapp_cmd.valid);
its_encode_target(cmd, desc->its_vmapp_cmd.col->target_address);
its_encode_vpt_addr(cmd, vpt_addr);
its_encode_vpt_size(cmd, LPI_NRBITS - 1);
its_fixup_cmd(cmd);
return desc->its_vmapp_cmd.vpe;
}
static struct its_vpe *its_build_vmapti_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
@ -803,6 +853,37 @@ static void its_send_vmovi(struct its_device *dev, u32 id)
its_send_single_vcommand(dev->its, its_build_vmovi_cmd, &desc);
}
static void its_send_vmapp(struct its_vpe *vpe, bool valid)
{
struct its_cmd_desc desc;
struct its_node *its;
desc.its_vmapp_cmd.vpe = vpe;
desc.its_vmapp_cmd.valid = valid;
list_for_each_entry(its, &its_nodes, entry) {
if (!its->is_v4)
continue;
desc.its_vmapp_cmd.col = &its->collections[vpe->col_idx];
its_send_single_vcommand(its, its_build_vmapp_cmd, &desc);
}
}
static void its_send_vinvall(struct its_vpe *vpe)
{
struct its_cmd_desc desc;
struct its_node *its;
desc.its_vinvall_cmd.vpe = vpe;
list_for_each_entry(its, &its_nodes, entry) {
if (!its->is_v4)
continue;
its_send_single_vcommand(its, its_build_vinvall_cmd, &desc);
}
}
/*
* irqchip functions - assumes MSI, mostly.
*/
@ -2203,9 +2284,30 @@ static int its_vpe_irq_domain_alloc(struct irq_domain *domain, unsigned int virq
return err;
}
static void its_vpe_irq_domain_activate(struct irq_domain *domain,
struct irq_data *d)
{
struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
/* Map the VPE to the first possible CPU */
vpe->col_idx = cpumask_first(cpu_online_mask);
its_send_vmapp(vpe, true);
its_send_vinvall(vpe);
}
static void its_vpe_irq_domain_deactivate(struct irq_domain *domain,
struct irq_data *d)
{
struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
its_send_vmapp(vpe, false);
}
static const struct irq_domain_ops its_vpe_domain_ops = {
.alloc = its_vpe_irq_domain_alloc,
.free = its_vpe_irq_domain_free,
.activate = its_vpe_irq_domain_activate,
.deactivate = its_vpe_irq_domain_deactivate,
};
static int its_force_quiescent(void __iomem *base)