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- // SPDX-License-Identifier: GPL-2.0
- /* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/pci.h>
- #include <uapi/linux/idxd.h>
- #include "idxd.h"
- #include "registers.h"
- static struct idxd_desc *__get_desc(struct idxd_wq *wq, int idx, int cpu)
- {
- struct idxd_desc *desc;
- desc = wq->descs[idx];
- memset(desc->hw, 0, sizeof(struct dsa_hw_desc));
- memset(desc->completion, 0, sizeof(struct dsa_completion_record));
- desc->cpu = cpu;
- return desc;
- }
- struct idxd_desc *idxd_alloc_desc(struct idxd_wq *wq, enum idxd_op_type optype)
- {
- int cpu, idx;
- struct idxd_device *idxd = wq->idxd;
- DEFINE_SBQ_WAIT(wait);
- struct sbq_wait_state *ws;
- struct sbitmap_queue *sbq;
- if (idxd->state != IDXD_DEV_ENABLED)
- return ERR_PTR(-EIO);
- sbq = &wq->sbq;
- idx = sbitmap_queue_get(sbq, &cpu);
- if (idx < 0) {
- if (optype == IDXD_OP_NONBLOCK)
- return ERR_PTR(-EAGAIN);
- } else {
- return __get_desc(wq, idx, cpu);
- }
- ws = &sbq->ws[0];
- for (;;) {
- sbitmap_prepare_to_wait(sbq, ws, &wait, TASK_INTERRUPTIBLE);
- if (signal_pending_state(TASK_INTERRUPTIBLE, current))
- break;
- idx = sbitmap_queue_get(sbq, &cpu);
- if (idx >= 0)
- break;
- schedule();
- }
- sbitmap_finish_wait(sbq, ws, &wait);
- if (idx < 0)
- return ERR_PTR(-EAGAIN);
- return __get_desc(wq, idx, cpu);
- }
- void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc)
- {
- int cpu = desc->cpu;
- desc->cpu = -1;
- sbitmap_queue_clear(&wq->sbq, desc->id, cpu);
- }
- int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
- {
- struct idxd_device *idxd = wq->idxd;
- int vec = desc->hw->int_handle;
- void __iomem *portal;
- if (idxd->state != IDXD_DEV_ENABLED)
- return -EIO;
- portal = wq->dportal;
- /*
- * The wmb() flushes writes to coherent DMA data before possibly
- * triggering a DMA read. The wmb() is necessary even on UP because
- * the recipient is a device.
- */
- wmb();
- iosubmit_cmds512(portal, desc->hw, 1);
- /*
- * Pending the descriptor to the lockless list for the irq_entry
- * that we designated the descriptor to.
- */
- if (desc->hw->flags & IDXD_OP_FLAG_RCI)
- llist_add(&desc->llnode,
- &idxd->irq_entries[vec].pending_llist);
- return 0;
- }
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