1 files changed, 97 insertions, 2 deletions

diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index c53405e7190e..576a39e6b198 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -318,7 +318,9 @@ static int start_context(struct ocxlflash_context *ctx)
 	void *link_token = afu->link_token;
 	struct device *dev = afu->dev;
 	bool master = ctx->master;
+	struct mm_struct *mm;
 	int rc = 0;
+	u32 pid;
 
 	if (master) {
 		ctx->psn_size = acfg->global_mmio_size;
@@ -328,9 +330,16 @@ static int start_context(struct ocxlflash_context *ctx)
 		ctx->psn_phys = afu->ppmmio_phys + (ctx->pe * ctx->psn_size);
 	}
 
+	/* pid and mm not set for master contexts */
+	if (master) {
+		pid = 0;
+		mm = NULL;
+	} else {
+		pid = current->mm->context.id;
+		mm = current->mm;
+	}
 
-	/* pid, tid, amr and mm are zeroes/NULL for a kernel context */
-	rc = ocxl_link_add_pe(link_token, ctx->pe, 0, 0, 0, NULL, NULL, NULL);
+	rc = ocxl_link_add_pe(link_token, ctx->pe, pid, 0, 0, mm, NULL, NULL);
 	if (unlikely(rc)) {
 		dev_err(dev, "%s: ocxl_link_add_pe failed rc=%d\n",
 			__func__, rc);
@@ -442,10 +451,14 @@ static void *ocxlflash_dev_context_init(struct pci_dev *pdev, void *afu_cookie)
 		goto err2;
 	}
 
+	spin_lock_init(&ctx->slock);
+
 	ctx->pe = rc;
 	ctx->master = false;
 	ctx->mapping = NULL;
 	ctx->hw_afu = afu;
+	ctx->irq_bitmap = 0;
+	ctx->pending_irq = false;
 out:
 	return ctx;
 err2:
@@ -956,6 +969,87 @@ static void *ocxlflash_fops_get_context(struct file *file)
 	return file->private_data;
 }
 
+/**
+ * ocxlflash_afu_irq() - interrupt handler for user contexts
+ * @irq:	Interrupt number.
+ * @data:	Private data provided at interrupt registration, the context.
+ *
+ * Return: Always return IRQ_HANDLED.
+ */
+static irqreturn_t ocxlflash_afu_irq(int irq, void *data)
+{
+	struct ocxlflash_context *ctx = data;
+	struct device *dev = ctx->hw_afu->dev;
+	int i;
+
+	dev_dbg(dev, "%s: Interrupt raised for pe %i virq %i\n",
+		__func__, ctx->pe, irq);
+
+	for (i = 0; i < ctx->num_irqs; i++) {
+		if (ctx->irqs[i].virq == irq)
+			break;
+	}
+	if (unlikely(i >= ctx->num_irqs)) {
+		dev_err(dev, "%s: Received AFU IRQ out of range\n", __func__);
+		goto out;
+	}
+
+	spin_lock(&ctx->slock);
+	set_bit(i - 1, &ctx->irq_bitmap);
+	ctx->pending_irq = true;
+	spin_unlock(&ctx->slock);
+out:
+	return IRQ_HANDLED;
+}
+
+/**
+ * ocxlflash_start_work() - start a user context
+ * @ctx_cookie:	Context to be started.
+ * @num_irqs:	Number of interrupts requested.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int ocxlflash_start_work(void *ctx_cookie, u64 num_irqs)
+{
+	struct ocxlflash_context *ctx = ctx_cookie;
+	struct ocxl_hw_afu *afu = ctx->hw_afu;
+	struct device *dev = afu->dev;
+	char *name;
+	int rc = 0;
+	int i;
+
+	rc = alloc_afu_irqs(ctx, num_irqs);
+	if (unlikely(rc < 0)) {
+		dev_err(dev, "%s: alloc_afu_irqs failed rc=%d\n", __func__, rc);
+		goto out;
+	}
+
+	for (i = 0; i < num_irqs; i++) {
+		name = kasprintf(GFP_KERNEL, "ocxlflash-%s-pe%i-%i",
+				 dev_name(dev), ctx->pe, i);
+		rc = afu_map_irq(0, ctx, i, ocxlflash_afu_irq, ctx, name);
+		kfree(name);
+		if (unlikely(rc < 0)) {
+			dev_err(dev, "%s: afu_map_irq failed rc=%d\n",
+				__func__, rc);
+			goto err;
+		}
+	}
+
+	rc = start_context(ctx);
+	if (unlikely(rc)) {
+		dev_err(dev, "%s: start_context failed rc=%d\n", __func__, rc);
+		goto err;
+	}
+out:
+	return rc;
+err:
+	for (i = i-1; i >= 0; i--)
+		afu_unmap_irq(0, ctx, i, ctx);
+	free_afu_irqs(ctx);
+	goto out;
+}
+
 /* Backend ops to ocxlflash services */
 const struct cxlflash_backend_ops cxlflash_ocxl_ops = {
 	.module			= THIS_MODULE,
@@ -978,4 +1072,5 @@ const struct cxlflash_backend_ops cxlflash_ocxl_ops = {
 	.destroy_afu		= ocxlflash_destroy_afu,
 	.get_fd			= ocxlflash_get_fd,
 	.fops_get_context	= ocxlflash_fops_get_context,
+	.start_work		= ocxlflash_start_work,
 };