[PATCH] nvmet: pci-epf: Remove nvmet_pci_epf_[un]map_queue()

[Damien Le Moal <dlemoal@kernel.org>]

The functions nvmet_pci_epf_map_queue() and nvmet_pci_epf_unmap_queue()
are called respectively only from nvmet_pci_epf_create_cq() and
nvmet_pci_epf_delete_cq(). Remove these functions and open-code them in
their call site.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---

Note: this goes on top of the patch "nvmet: pci-epf: Keep completion
queues mapped". I can squash these 2 patches together if preferred.

 drivers/nvme/target/pci-epf.c | 54 +++++++++++++----------------------
 1 file changed, 20 insertions(+), 34 deletions(-)

diff --git a/drivers/nvme/target/pci-epf.c b/drivers/nvme/target/pci-epf.c
index 6272cd013136..f56994a78066 100644
--- a/drivers/nvme/target/pci-epf.c
+++ b/drivers/nvme/target/pci-epf.c
@@ -271,36 +271,6 @@ static inline void nvmet_pci_epf_mem_unmap(struct nvmet_pci_epf *nvme_epf,
 	pci_epc_mem_unmap(epf->epc, epf->func_no, epf->vfunc_no, map);
 }
 
-static int nvmet_pci_epf_map_queue(struct nvmet_pci_epf_ctrl *ctrl,
-				   struct nvmet_pci_epf_queue *queue)
-{
-	struct nvmet_pci_epf *nvme_epf = ctrl->nvme_epf;
-	int ret;
-
-	ret = nvmet_pci_epf_mem_map(nvme_epf, queue->pci_addr,
-				    queue->pci_size, &queue->pci_map);
-	if (ret) {
-		dev_err(ctrl->dev, "Failed to map queue %u (err=%d)\n",
-			queue->qid, ret);
-		return ret;
-	}
-
-	if (queue->pci_map.pci_size < queue->pci_size) {
-		dev_err(ctrl->dev, "Invalid partial mapping of queue %u\n",
-			queue->qid);
-		nvmet_pci_epf_mem_unmap(nvme_epf, &queue->pci_map);
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static inline void nvmet_pci_epf_unmap_queue(struct nvmet_pci_epf_ctrl *ctrl,
-					     struct nvmet_pci_epf_queue *queue)
-{
-	nvmet_pci_epf_mem_unmap(ctrl->nvme_epf, &queue->pci_map);
-}
-
 struct nvmet_pci_epf_dma_filter {
 	struct device *dev;
 	u32 dma_mask;
@@ -1329,10 +1299,22 @@ static u16 nvmet_pci_epf_create_cq(struct nvmet_ctrl *tctrl,
 	if (status != NVME_SC_SUCCESS)
 		goto err;
 
-	ret = nvmet_pci_epf_map_queue(ctrl, cq);
+	/*
+	 * Map the CQ PCI address space and since PCI endpoint controllers may
+	 * return a partial mapping, check that the mapping is large enough.
+	 */
+	ret = nvmet_pci_epf_mem_map(ctrl->nvme_epf, cq->pci_addr, cq->pci_size,
+				    &cq->pci_map);
 	if (ret) {
-		status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
-		goto err;
+		dev_err(ctrl->dev, "Failed to map CQ %u (err=%d)\n",
+			cq->qid, ret);
+		goto err_internal;
+	}
+
+	if (cq->pci_map.pci_size < cq->pci_size) {
+		dev_err(ctrl->dev, "Invalid partial mapping of queue %u\n",
+			cq->qid);
+		goto err_unmap_queue;
 	}
 
 	set_bit(NVMET_PCI_EPF_Q_LIVE, &cq->flags);
@@ -1342,6 +1324,10 @@ static u16 nvmet_pci_epf_create_cq(struct nvmet_ctrl *tctrl,
 
 	return NVME_SC_SUCCESS;
 
+err_unmap_queue:
+	nvmet_pci_epf_mem_unmap(ctrl->nvme_epf, &cq->pci_map);
+err_internal:
+	status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
 err:
 	if (test_and_clear_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags))
 		nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);
@@ -1359,7 +1345,7 @@ static u16 nvmet_pci_epf_delete_cq(struct nvmet_ctrl *tctrl, u16 cqid)
 	cancel_delayed_work_sync(&cq->work);
 	nvmet_pci_epf_drain_queue(cq);
 	nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);
-	nvmet_pci_epf_unmap_queue(ctrl, cq);
+	nvmet_pci_epf_mem_unmap(ctrl->nvme_epf, &cq->pci_map);
 
 	return NVME_SC_SUCCESS;
 }
-- 
2.48.1