Commit c1d4d5cd authored by Marc Zyngier's avatar Marc Zyngier
Browse files

irqchip/gic-v3-its: Add its_vlpi_map helpers 



Obtaining the mapping information for a VLPI is something quite common,
and the GICv4.1 code is going to make even more use of it. Expose it as
a separate set of helpers.

Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Reviewed-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20191027144234.8395-8-maz@kernel.org
Link: https://lore.kernel.org/r/20191108165805.3071-8-maz@kernel.org
parent 576a8342

drivers/irqchip/irq-gic-v3-its.c

+32 −15
Original line number Diff line number Diff line
@@ -207,6 +207,15 @@ static struct its_collection *dev_event_to_col(struct its_device *its_dev, 
	return its->collections + its_dev->event_map.col_map[event];

}



static struct its_vlpi_map *dev_event_to_vlpi_map(struct its_device *its_dev,

					       u32 event)

{

	if (WARN_ON_ONCE(event >= its_dev->event_map.nr_lpis))

		return NULL;



	return &its_dev->event_map.vlpi_maps[event];

}



static struct its_collection *irq_to_col(struct irq_data *d)

{

	struct its_device *its_dev = irq_data_get_irq_chip_data(d);
@@ -971,7 +980,7 @@ static void its_send_invall(struct its_node *its, struct its_collection *col) 


static void its_send_vmapti(struct its_device *dev, u32 id)

{

	struct its_vlpi_map *map = &dev->event_map.vlpi_maps[id];

	struct its_vlpi_map *map = dev_event_to_vlpi_map(dev, id);

	struct its_cmd_desc desc;



	desc.its_vmapti_cmd.vpe = map->vpe;
@@ -985,7 +994,7 @@ static void its_send_vmapti(struct its_device *dev, u32 id) 


static void its_send_vmovi(struct its_device *dev, u32 id)

{

	struct its_vlpi_map *map = &dev->event_map.vlpi_maps[id];

	struct its_vlpi_map *map = dev_event_to_vlpi_map(dev, id);

	struct its_cmd_desc desc;



	desc.its_vmovi_cmd.vpe = map->vpe;
@@ -1063,20 +1072,26 @@ static void its_send_vinvall(struct its_node *its, struct its_vpe *vpe) 
/*

 * irqchip functions - assumes MSI, mostly.

 */

static struct its_vlpi_map *get_vlpi_map(struct irq_data *d)

{

	struct its_device *its_dev = irq_data_get_irq_chip_data(d);

	u32 event = its_get_event_id(d);



	if (!irqd_is_forwarded_to_vcpu(d))

		return NULL;



	return dev_event_to_vlpi_map(its_dev, event);

}



static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)

{

	struct its_vlpi_map *map = get_vlpi_map(d);

	irq_hw_number_t hwirq;

	void *va;

	u8 *cfg;



	if (irqd_is_forwarded_to_vcpu(d)) {

		struct its_device *its_dev = irq_data_get_irq_chip_data(d);

		u32 event = its_get_event_id(d);

		struct its_vlpi_map *map;



		va = page_address(its_dev->event_map.vm->vprop_page);

		map = &its_dev->event_map.vlpi_maps[event];

	if (map) {

		va = page_address(map->vm->vprop_page);

		hwirq = map->vintid;



		/* Remember the updated property */
@@ -1136,11 +1151,14 @@ static void its_vlpi_set_doorbell(struct irq_data *d, bool enable) 
{

	struct its_device *its_dev = irq_data_get_irq_chip_data(d);

	u32 event = its_get_event_id(d);

	struct its_vlpi_map *map;



	if (its_dev->event_map.vlpi_maps[event].db_enabled == enable)

	map = dev_event_to_vlpi_map(its_dev, event);



	if (map->db_enabled == enable)

		return;



	its_dev->event_map.vlpi_maps[event].db_enabled = enable;

	map->db_enabled = enable;



	/*

	 * More fun with the architecture:
@@ -1369,19 +1387,18 @@ out: 
static int its_vlpi_get(struct irq_data *d, struct its_cmd_info *info)

{

	struct its_device *its_dev = irq_data_get_irq_chip_data(d);

	u32 event = its_get_event_id(d);

	struct its_vlpi_map *map = get_vlpi_map(d);

	int ret = 0;



	mutex_lock(&its_dev->event_map.vlpi_lock);



	if (!its_dev->event_map.vm ||

	    !its_dev->event_map.vlpi_maps[event].vm) {

	if (!its_dev->event_map.vm || !map->vm) {

		ret = -EINVAL;

		goto out;

	}



	/* Copy our mapping information to the incoming request */

	*info->map = its_dev->event_map.vlpi_maps[event];

	*info->map = *map;



out:

	mutex_unlock(&its_dev->event_map.vlpi_lock);

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