/*! Helper function to allocate the iobuffer needed by an eventq
* - it ensures the eventq has the correct alignment for the NIC
*
* \param rm Event-queue resource manager
* \param instance Event-queue instance (index)
* \param dma_addrs Array to populate with addrs of allocated pages
* \param page_order Requested size of eventq
* \return < 0 if iobuffer allocation fails
*/
static int
efhw_nic_event_queue_alloc_iobuffer(struct efhw_nic *nic,
struct eventq_resource_hardware *h,
int evq_instance,
dma_addr_t *dma_addrs,
unsigned int page_order)
{
int i, j, rc;
/* Allocate an iobuffer. */
EFHW_TRACE("allocating eventq size %x",
1u << (page_order + PAGE_SHIFT));
rc = efhw_iopages_alloc(nic->pci_dev, &h->iobuff, page_order, NULL,
0UL);
if (rc < 0) {
EFHW_WARN("%s: failed to allocate %u pages",
__FUNCTION__, 1u << page_order);
return rc;
}
/* Set the eventq pages to match EFHW_CLEAR_EVENT() */
if (EFHW_CLEAR_EVENT_VALUE)
memset(efhw_iopages_ptr(&h->iobuff),
EFHW_CLEAR_EVENT_VALUE, (1u << page_order) * PAGE_SIZE);
EFHW_TRACE("%s: allocated %u pages", __FUNCTION__, 1u << (page_order));
/* For Falcon the NIC is programmed with the base buffer address of a
* contiguous region of buffer space. This means that larger than a
* PAGE event queues can be expected to allocate even when the host's
* physical memory is fragmented */
EFHW_ASSERT(efhw_nic_have_hw(nic));
EFHW_ASSERT(1 << EFHW_GFP_ORDER_TO_NIC_ORDER(page_order) <=
EFHW_BUFFER_TABLE_BLOCK_SIZE);
/* Initialise the buffer table entries. */
rc = efhw_nic_buffer_table_alloc(nic, 0, 0, &h->bt_block);
if (rc < 0) {
EFHW_WARN("%s: failed to allocate buffer table block",
__FUNCTION__);
efhw_iopages_free(nic->pci_dev, &h->iobuff, NULL);
return rc;
}
for (i = 0; i < (1 << page_order); ++i) {
for (j = 0; j < EFHW_NIC_PAGES_IN_OS_PAGE; ++j) {
dma_addrs[i * EFHW_NIC_PAGES_IN_OS_PAGE + j] =
efhw_iopages_dma_addr(&h->iobuff, i);
}
}
efhw_nic_buffer_table_set(nic, h->bt_block, 0,
1 << EFHW_GFP_ORDER_TO_NIC_ORDER(page_order),
dma_addrs);
falcon_nic_buffer_table_confirm(nic);
return 0;
}
void efhw_keventq_dtor(struct efhw_nic *nic, struct efhw_keventq *evq)
{
EFHW_ASSERT(evq);
EFHW_TRACE("%s: [%d]", __FUNCTION__, evq->instance);
/* Zero the timer-value for this queue.
And Tell NIC to stop using this event queue. */
efhw_nic_event_queue_disable(nic, evq->instance, 0);
/* free the pages used by the eventq itself */
efhw_iopages_free(nic, &evq->hw.iobuff);
}
void efhw_keventq_dtor(struct efhw_nic *nic, struct efhw_keventq *evq)
{
int order = EFHW_GFP_ORDER_TO_NIC_ORDER(get_order(evq->hw.capacity *
sizeof(efhw_event_t)));
EFHW_ASSERT(evq);
EFHW_TRACE("%s: [%d]", __FUNCTION__, evq->instance);
/* Zero the timer-value for this queue.
And Tell NIC to stop using this event queue. */
efhw_nic_event_queue_disable(nic, evq->instance,
0 /* not used on falcon */);
/* Free buftable entries */
efhw_nic_buffer_table_clear(nic, evq->hw.bt_block, 0,
1 << order);
efhw_nic_buffer_table_free(nic, evq->hw.bt_block);
/* free the pages used by the eventq itself */
efhw_iopages_free(nic->pci_dev, &evq->hw.iobuff, NULL);
}