* the COPYING file in the top-level directory.
*/
-#include <asm/irqchip.h>
-#include <asm/sysregs.h>
#include <jailhouse/entry.h>
+#include <jailhouse/mmio.h>
#include <jailhouse/paging.h>
#include <jailhouse/printk.h>
#include <jailhouse/string.h>
+#include <asm/gic_common.h>
+#include <asm/irqchip.h>
+#include <asm/platform.h>
+#include <asm/setup.h>
+#include <asm/sysregs.h>
+
+/* AMBA's biosfood */
+#define AMBA_DEVICE 0xb105f00d
+
+void *gicd_base;
+unsigned long gicd_size;
/*
* The init function must be called after the MMU setup, and whilst in the
static bool irqchip_is_init;
static struct irqchip_ops irqchip;
+bool spi_in_cell(struct cell *cell, unsigned int spi)
+{
+ /* FIXME: Change the configuration to a bitmask range */
+ u32 spi_mask;
+
+ if (spi >= 64)
+ return false;
+ else if (spi >= 32)
+ spi_mask = cell->arch.spis >> 32;
+ else
+ spi_mask = cell->arch.spis;
+
+ return spi_mask & (1 << (spi & 31));
+}
+
+static int irqchip_init_pending(struct per_cpu *cpu_data)
+{
+ struct pending_irq *pend_array;
+
+ if (cpu_data->pending_irqs == NULL) {
+ cpu_data->pending_irqs = pend_array = page_alloc(&mem_pool, 1);
+ if (pend_array == NULL)
+ return -ENOMEM;
+ } else {
+ pend_array = cpu_data->pending_irqs;
+ }
+
+ memset(pend_array, 0, PAGE_SIZE);
+
+ cpu_data->pending_irqs = pend_array;
+ cpu_data->first_pending = NULL;
+
+ return 0;
+}
+
+/*
+ * Find the first available pending struct for insertion. The `prev' pointer is
+ * set to the previous pending interrupt, if any, to help inserting the new one
+ * into the list.
+ * Returns NULL when no slot is available
+ */
+static struct pending_irq* get_pending_slot(struct per_cpu *cpu_data,
+ struct pending_irq **prev)
+{
+ u32 i, pending_idx;
+ struct pending_irq *pending = cpu_data->first_pending;
+
+ *prev = NULL;
+
+ for (i = 0; i < MAX_PENDING_IRQS; i++) {
+ pending_idx = pending - cpu_data->pending_irqs;
+ if (pending == NULL || i < pending_idx)
+ return cpu_data->pending_irqs + i;
+
+ *prev = pending;
+ pending = pending->next;
+ }
+
+ return NULL;
+}
+
+int irqchip_insert_pending(struct per_cpu *cpu_data, struct pending_irq *irq)
+{
+ struct pending_irq *prev = NULL;
+ struct pending_irq *slot;
+
+ spin_lock(&cpu_data->gic_lock);
+
+ slot = get_pending_slot(cpu_data, &prev);
+ if (slot == NULL) {
+ spin_unlock(&cpu_data->gic_lock);
+ return -ENOMEM;
+ }
+
+ /*
+ * Don't override the pointers yet, they may be read by the injection
+ * loop. Odds are astronomically low, but hey.
+ */
+ memcpy(slot, irq, sizeof(struct pending_irq) - 2 * sizeof(void *));
+ slot->prev = prev;
+ if (prev) {
+ slot->next = prev->next;
+ prev->next = slot;
+ } else {
+ slot->next = cpu_data->first_pending;
+ cpu_data->first_pending = slot;
+ }
+ if (slot->next)
+ slot->next->prev = slot;
+
+ spin_unlock(&cpu_data->gic_lock);
+
+ return 0;
+}
+
+int irqchip_set_pending(struct per_cpu *cpu_data, u32 irq_id, bool try_inject)
+{
+ struct pending_irq pending;
+
+ pending.virt_id = irq_id;
+
+ if (try_inject && irqchip.inject_irq(cpu_data, &pending) == 0)
+ return 0;
+
+ return irqchip_insert_pending(cpu_data, &pending);
+}
+
+/*
+ * Only executed by `irqchip_inject_pending' on a CPU to inject its own stuff.
+ */
+int irqchip_remove_pending(struct per_cpu *cpu_data, struct pending_irq *irq)
+{
+ spin_lock(&cpu_data->gic_lock);
+
+ if (cpu_data->first_pending == irq)
+ cpu_data->first_pending = irq->next;
+ if (irq->prev)
+ irq->prev->next = irq->next;
+ if (irq->next)
+ irq->next->prev = irq->prev;
+
+ spin_unlock(&cpu_data->gic_lock);
+
+ return 0;
+}
+
+void irqchip_inject_pending(struct per_cpu *cpu_data)
+{
+ int err;
+ struct pending_irq *pending = cpu_data->first_pending;
+
+ while (pending != NULL) {
+ err = irqchip.inject_irq(cpu_data, pending);
+ if (err == -EBUSY)
+ /* The list registers are full. */
+ break;
+ else
+ /*
+ * Removal only changes the pointers, but does not
+ * deallocate anything.
+ * Concurrent accesses are avoided with the spinlock,
+ * but the `next' pointer of the current pending object
+ * may be rewritten by an external insert before or
+ * after this removal, which isn't an issue.
+ */
+ irqchip_remove_pending(cpu_data, pending);
+
+ pending = pending->next;
+ }
+}
+
void irqchip_handle_irq(struct per_cpu *cpu_data)
{
irqchip.handle_irq(cpu_data);
}
+void irqchip_eoi_irq(u32 irqn, bool deactivate)
+{
+ irqchip.eoi_irq(irqn, deactivate);
+}
+
int irqchip_send_sgi(struct sgi *sgi)
{
return irqchip.send_sgi(sgi);
int irqchip_cpu_init(struct per_cpu *cpu_data)
{
+ int err;
+
+ err = irqchip_init_pending(cpu_data);
+ if (err)
+ return err;
+
if (irqchip.cpu_init)
return irqchip.cpu_init(cpu_data);
return 0;
}
+int irqchip_cpu_reset(struct per_cpu *cpu_data)
+{
+ int err;
+
+ err = irqchip_init_pending(cpu_data);
+ if (err)
+ return err;
+
+ if (irqchip.cpu_reset)
+ return irqchip.cpu_reset(cpu_data, false);
+
+ return 0;
+}
+
+void irqchip_cpu_shutdown(struct per_cpu *cpu_data)
+{
+ /*
+ * The GIC backend must take care of only resetting the hyp interface if
+ * it has been initialised: this function may be executed during the
+ * setup phase.
+ */
+ if (irqchip.cpu_reset)
+ irqchip.cpu_reset(cpu_data, true);
+}
+
+static const struct jailhouse_irqchip *
+irqchip_find_config(struct jailhouse_cell_desc *config)
+{
+ const struct jailhouse_irqchip *irq_config =
+ jailhouse_cell_irqchips(config);
+
+ if (config->num_irqchips)
+ return irq_config;
+ else
+ return NULL;
+}
+
+int irqchip_cell_init(struct cell *cell)
+{
+ const struct jailhouse_irqchip *pins = irqchip_find_config(cell->config);
+
+ cell->arch.spis = (pins ? pins->pin_bitmap : 0);
+
+ return irqchip.cell_init(cell);
+}
+
+void irqchip_cell_exit(struct cell *cell)
+{
+ const struct jailhouse_irqchip *root_pins =
+ irqchip_find_config(root_cell.config);
+
+ /* might be called by arch_shutdown while rolling back
+ * a failed setup */
+ if (!irqchip_is_init)
+ return;
+
+ if (root_pins)
+ root_cell.arch.spis |= cell->arch.spis & root_pins->pin_bitmap;
+
+ irqchip.cell_exit(cell);
+}
+
+void irqchip_root_cell_shrink(struct cell *cell)
+{
+ root_cell.arch.spis &= ~(cell->arch.spis);
+}
+
+/* Only the GIC is implemented */
+extern struct irqchip_ops gic_irqchip;
+
int irqchip_init(void)
{
+ int i, err;
+ u32 pidr2, cidr;
+ u32 dev_id = 0;
+
/* Only executed on master CPU */
if (irqchip_is_init)
return 0;
- memset(&irqchip, 0, sizeof(irqchip));
- irqchip_is_init = true;
+ /* FIXME: parse device tree */
+ gicd_base = GICD_BASE;
+ gicd_size = GICD_SIZE;
+
+ if ((err = arch_map_device(gicd_base, gicd_base, gicd_size)) != 0)
+ return err;
+
+ for (i = 3; i >= 0; i--) {
+ cidr = mmio_read32(gicd_base + GICD_CIDR0 + i * 4);
+ dev_id |= cidr << i * 8;
+ }
+ if (dev_id != AMBA_DEVICE)
+ goto err_no_distributor;
+
+ /* Probe the GIC version */
+ pidr2 = mmio_read32(gicd_base + GICD_PIDR2);
+ switch (GICD_PIDR2_ARCH(pidr2)) {
+ case 0x2:
+ case 0x3:
+ case 0x4:
+ memcpy(&irqchip, &gic_irqchip, sizeof(struct irqchip_ops));
+ break;
+ }
+
+ if (irqchip.init) {
+ err = irqchip.init();
+ irqchip_is_init = true;
+
+ return err;
+ }
+
+err_no_distributor:
+ printk("GIC: no distributor found\n");
+ arch_unmap_device(gicd_base, gicd_size);
return -ENODEV;
}
projects / jailhouse.git / blobdiff