Add support to allocate and free AFU interrupts using the OCXL provider
services. The trigger page returned upon successful allocation will be
mapped and exposed to the cxlflash core in a future commit.
Signed-off-by: Uma Krishnan <ukrishn@xxxxxxxxxxxxxxxxxx>
Acked-by: Matthew R. Ochs <mrochs@xxxxxxxxxxxxxxxxxx>
---
drivers/scsi/cxlflash/ocxl_hw.c | 104 ++++++++++++++++++++++++++++++++++++++++
drivers/scsi/cxlflash/ocxl_hw.h | 10 ++++
2 files changed, 114 insertions(+)
diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index 8d21f94..75351c3 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -385,6 +385,108 @@ static ssize_t ocxlflash_read_adapter_vpd(struct pci_dev *pdev, void *buf,
}
/**
+ * free_afu_irqs() - internal service to free interrupts
+ * @ctx: Adapter context.
+ */
+static void free_afu_irqs(struct ocxlflash_context *ctx)
+{
+ struct ocxl_hw_afu *afu = ctx->hw_afu;
+ struct device *dev = afu->dev;
+ int i;
+
+ if (!ctx->irqs) {
+ dev_err(dev, "%s: Interrupts not allocated\n", __func__);
+ return;
+ }
+
+ for (i = ctx->num_irqs; i >= 0; i--)
+ ocxl_link_free_irq(afu->link_token, ctx->irqs[i].hwirq);
+
+ kfree(ctx->irqs);
+ ctx->irqs = NULL;
+}
+
+/**
+ * alloc_afu_irqs() - internal service to allocate interrupts
+ * @ctx: Context associated with the request.
+ * @num: Number of interrupts requested.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int alloc_afu_irqs(struct ocxlflash_context *ctx, int num)
+{
+ struct ocxl_hw_afu *afu = ctx->hw_afu;
+ struct device *dev = afu->dev;
+ struct ocxlflash_irqs *irqs;
+ u64 addr;
+ int rc = 0;
+ int hwirq;
+ int i;
+
+ if (ctx->irqs) {
+ dev_err(dev, "%s: Interrupts already allocated\n", __func__);
+ rc = -EEXIST;
+ goto out;
+ }
+
+ if (num > OCXL_MAX_IRQS) {
+ dev_err(dev, "%s: Too many interrupts num=%d\n", __func__, num);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ irqs = kcalloc(num, sizeof(*irqs), GFP_KERNEL);
+ if (unlikely(!irqs)) {
+ dev_err(dev, "%s: Context irqs allocation failed\n", __func__);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ for (i = 0; i < num; i++) {
+ rc = ocxl_link_irq_alloc(afu->link_token, &hwirq, &addr);
+ if (unlikely(rc)) {
+ dev_err(dev, "%s: ocxl_link_irq_alloc failed rc=%d\n",
+ __func__, rc);
+ goto err;
+ }
+
+ irqs[i].hwirq = hwirq;
+ irqs[i].ptrig = addr;
+ }
+
+ ctx->irqs = irqs;
+ ctx->num_irqs = num;
+out:
+ return rc;
+err:
+ for (i = i-1; i >= 0; i--)
+ ocxl_link_free_irq(afu->link_token, irqs[i].hwirq);
+ kfree(irqs);
+ goto out;
+}
+
+/**
+ * ocxlflash_allocate_afu_irqs() - allocates the requested number of interrupts
+ * @ctx_cookie: Context associated with the request.
+ * @num: Number of interrupts requested.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int ocxlflash_allocate_afu_irqs(void *ctx_cookie, int num)
+{
+ return alloc_afu_irqs(ctx_cookie, num);
+}
+
+/**
+ * ocxlflash_free_afu_irqs() - frees the interrupts of an adapter context
+ * @ctx_cookie: Adapter context.
+ */
+static void ocxlflash_free_afu_irqs(void *ctx_cookie)
+{
+ free_afu_irqs(ctx_cookie);
+}
+
+/**
* ocxlflash_unconfig_afu() - unconfigure the AFU
* @afu: AFU associated with the host.
*/
@@ -750,6 +852,8 @@ const struct cxlflash_backend_ops cxlflash_ocxl_ops = {
.release_context = ocxlflash_release_context,
.perst_reloads_same_image = ocxlflash_perst_reloads_same_image,
.read_adapter_vpd = ocxlflash_read_adapter_vpd,
+ .allocate_afu_irqs = ocxlflash_allocate_afu_irqs,
+ .free_afu_irqs = ocxlflash_free_afu_irqs,
.create_afu = ocxlflash_create_afu,
.destroy_afu = ocxlflash_destroy_afu,
.get_fd = ocxlflash_get_fd,
diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h
index 09fa94c..85b3fad 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.h
+++ b/drivers/scsi/cxlflash/ocxl_hw.h
@@ -12,6 +12,13 @@
* 2 of the License, or (at your option) any later version.
*/
+#define OCXL_MAX_IRQS 4 /* Max interrupts per process */
+
+struct ocxlflash_irqs {
+ int hwirq;
+ u64 ptrig;
+};
+
/* OCXL hardware AFU associated with the host */
struct ocxl_hw_afu {
struct ocxlflash_context *ocxl_ctx; /* Host context */
@@ -45,4 +52,7 @@ struct ocxlflash_context {
phys_addr_t psn_phys; /* Process mapping */
u64 psn_size; /* Process mapping size */
+
+ struct ocxlflash_irqs *irqs; /* Pointer to array of structures */
+ int num_irqs; /* Number of interrupts */
};
--
2.1.0
