-
-static int msi_free_vector(struct pci_dev* dev, int vector, int reassign);
-static int assign_msi_vector(void)
-{
- static int new_vector_avail = 1;
- int vector;
- unsigned long flags;
-
- /*
- * msi_lock is provided to ensure that successful allocation of MSI
- * vector is assigned unique among drivers.
- */
- spin_lock_irqsave(&msi_lock, flags);
-
- if (!new_vector_avail) {
- int free_vector = 0;
-
- /*
- * vector_irq[] = -1 indicates that this specific vector is:
- * - assigned for MSI (since MSI have no associated IRQ) or
- * - assigned for legacy if less than 16, or
- * - having no corresponding 1:1 vector-to-IOxAPIC IRQ mapping
- * vector_irq[] = 0 indicates that this vector, previously
- * assigned for MSI, is freed by hotplug removed operations.
- * This vector will be reused for any subsequent hotplug added
- * operations.
- * vector_irq[] > 0 indicates that this vector is assigned for
- * IOxAPIC IRQs. This vector and its value provides a 1-to-1
- * vector-to-IOxAPIC IRQ mapping.
- */
- for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) {
- if (vector_irq[vector] != 0)
- continue;
- free_vector = vector;
- if (!msi_desc[vector])
- break;
- else
- continue;
- }
- if (!free_vector) {
- spin_unlock_irqrestore(&msi_lock, flags);
- return -EBUSY;
- }
- vector_irq[free_vector] = -1;
- nr_released_vectors--;
- spin_unlock_irqrestore(&msi_lock, flags);
- if (msi_desc[free_vector] != NULL) {
- struct pci_dev *dev;
- int tail;
-
- /* free all linked vectors before re-assign */
- do {
- spin_lock_irqsave(&msi_lock, flags);
- dev = msi_desc[free_vector]->dev;
- tail = msi_desc[free_vector]->link.tail;
- spin_unlock_irqrestore(&msi_lock, flags);
- msi_free_vector(dev, tail, 1);
- } while (free_vector != tail);
- }
-
- return free_vector;
- }
- vector = assign_irq_vector(AUTO_ASSIGN);
- last_alloc_vector = vector;
- if (vector == LAST_DEVICE_VECTOR)
- new_vector_avail = 0;
-
- spin_unlock_irqrestore(&msi_lock, flags);
- return vector;
-}
-
-static int get_new_vector(void)
-{
- int vector;
-
- if ((vector = assign_msi_vector()) > 0)
- set_intr_gate(vector, interrupt[vector]);
-
- return vector;
-}
-