From: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
To: linux-scsi@vger.kernel.org,
James Bottomley <jejb@linux.vnet.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
"Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>,
"Manoj N. Kumar" <manoj@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Frederic Barrat <fbarrat@linux.vnet.ibm.com>,
Christophe Lombard <clombard@linux.vnet.ibm.com>
Subject: [PATCH 11/38] cxlflash: Adapter context support for OpenCXL
Date: Thu, 22 Feb 2018 16:24:09 -0600 [thread overview]
Message-ID: <1519338249-52181-1-git-send-email-ukrishn@linux.vnet.ibm.com> (raw)
In-Reply-To: <1519338010-51782-1-git-send-email-ukrishn@linux.vnet.ibm.com>
Add support to create and release the adapter contexts for OpenCXL and
provide means to specify certain contexts as a master.
The existing cxlflash core has a design requirement that each host will
have a single host context available by default. To satisfy this
requirement, one host adapter context is created when the hardware AFU is
initialized. This is returned by the get_context() fop.
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
---
drivers/scsi/cxlflash/ocxl_hw.c | 90 +++++++++++++++++++++++++++++++++++++++++
drivers/scsi/cxlflash/ocxl_hw.h | 6 +++
2 files changed, 96 insertions(+)
diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c
index 677bc34..c5f5c81 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.c
+++ b/drivers/scsi/cxlflash/ocxl_hw.c
@@ -18,6 +18,80 @@
#include "ocxl_hw.h"
/**
+ * ocxlflash_set_master() - sets the context as master
+ * @ctx_cookie: Adapter context to set as master.
+ */
+static void ocxlflash_set_master(void *ctx_cookie)
+{
+ struct ocxlflash_context *ctx = ctx_cookie;
+
+ ctx->master = true;
+}
+
+/**
+ * ocxlflash_get_context() - obtains the context associated with the host
+ * @pdev: PCI device associated with the host.
+ * @afu_cookie: Hardware AFU associated with the host.
+ *
+ * Return: returns the pointer to host adapter context
+ */
+static void *ocxlflash_get_context(struct pci_dev *pdev, void *afu_cookie)
+{
+ struct ocxl_hw_afu *afu = afu_cookie;
+
+ return afu->ocxl_ctx;
+}
+
+/**
+ * ocxlflash_dev_context_init() - allocate and initialize an adapter context
+ * @pdev: PCI device associated with the host.
+ * @afu_cookie: Hardware AFU associated with the host.
+ *
+ * Return: returns the adapter context on success, ERR_PTR on failure
+ */
+static void *ocxlflash_dev_context_init(struct pci_dev *pdev, void *afu_cookie)
+{
+ struct ocxl_hw_afu *afu = afu_cookie;
+ struct device *dev = afu->dev;
+ struct ocxlflash_context *ctx;
+ int rc;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (unlikely(!ctx)) {
+ dev_err(dev, "%s: Context allocation failed\n", __func__);
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ ctx->master = false;
+ ctx->hw_afu = afu;
+out:
+ return ctx;
+err:
+ ctx = ERR_PTR(rc);
+ goto out;
+}
+
+/**
+ * ocxlflash_release_context() - releases an adapter context
+ * @ctx_cookie: Adapter context to be released.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int ocxlflash_release_context(void *ctx_cookie)
+{
+ struct ocxlflash_context *ctx = ctx_cookie;
+ int rc = 0;
+
+ if (!ctx)
+ goto out;
+
+ kfree(ctx);
+out:
+ return rc;
+}
+
+/**
* ocxlflash_destroy_afu() - destroy the AFU structure
* @afu_cookie: AFU to be freed.
*/
@@ -28,6 +102,7 @@ static void ocxlflash_destroy_afu(void *afu_cookie)
if (!afu)
return;
+ ocxlflash_release_context(afu->ocxl_ctx);
kfree(afu);
}
@@ -127,6 +202,7 @@ static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu)
static void *ocxlflash_create_afu(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
+ struct ocxlflash_context *ctx;
struct ocxl_hw_afu *afu;
int rc;
@@ -152,6 +228,16 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev)
__func__, rc);
goto err1;
}
+
+ ctx = ocxlflash_dev_context_init(pdev, afu);
+ if (IS_ERR(ctx)) {
+ rc = PTR_ERR(ctx);
+ dev_err(dev, "%s: ocxlflash_dev_context_init failed rc=%d\n",
+ __func__, rc);
+ goto err1;
+ }
+
+ afu->ocxl_ctx = ctx;
out:
return afu;
err1:
@@ -163,6 +249,10 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev)
/* Backend ops to ocxlflash services */
const struct cxlflash_backend_ops cxlflash_ocxl_ops = {
.module = THIS_MODULE,
+ .set_master = ocxlflash_set_master,
+ .get_context = ocxlflash_get_context,
+ .dev_context_init = ocxlflash_dev_context_init,
+ .release_context = ocxlflash_release_context,
.create_afu = ocxlflash_create_afu,
.destroy_afu = ocxlflash_destroy_afu,
};
diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h
index a807656..f78e5c9 100644
--- a/drivers/scsi/cxlflash/ocxl_hw.h
+++ b/drivers/scsi/cxlflash/ocxl_hw.h
@@ -14,6 +14,7 @@
/* OpenCXL hardware AFU associated with the host */
struct ocxl_hw_afu {
+ struct ocxlflash_context *ocxl_ctx; /* Host context */
struct pci_dev *pdev; /* PCI device */
struct device *dev; /* Generic device */
@@ -27,3 +28,8 @@ struct ocxl_hw_afu {
int max_pasid; /* Maximum number of contexts */
};
+
+struct ocxlflash_context {
+ struct ocxl_hw_afu *hw_afu; /* HW AFU back pointer */
+ bool master; /* Whether this is a master context */
+};
--
2.1.0
next prev parent reply other threads:[~2018-02-22 22:24 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-22 22:20 [PATCH 00/38] cxlflash: OpenCXL transport support Uma Krishnan
2018-02-22 22:21 ` [PATCH 01/38] cxlflash: Preserve number of interrupts for master contexts Uma Krishnan
2018-02-22 22:22 ` [PATCH 02/38] cxlflash: Avoid clobbering context control register value Uma Krishnan
2018-02-22 22:22 ` [PATCH 03/38] cxlflash: Add argument identifier names Uma Krishnan
2018-02-22 22:22 ` [PATCH 04/38] cxlflash: Introduce OpenCXL backend Uma Krishnan
2018-02-23 4:28 ` Andrew Donnellan
2018-02-23 19:36 ` Uma Krishnan
2018-02-22 22:23 ` [PATCH 05/38] cxlflash: Hardware AFU for OpenCXL Uma Krishnan
2018-02-22 22:23 ` [PATCH 06/38] cxlflash: Read host function configuration Uma Krishnan
2018-02-22 22:23 ` [PATCH 07/38] cxlflash: Setup function acTag range Uma Krishnan
2018-02-22 22:23 ` [PATCH 08/38] cxlflash: Read host AFU configuration Uma Krishnan
2018-02-22 22:23 ` [PATCH 09/38] cxlflash: Setup AFU acTag range Uma Krishnan
2018-02-22 22:24 ` [PATCH 10/38] cxlflash: Setup AFU PASID Uma Krishnan
2018-02-22 22:24 ` Uma Krishnan [this message]
2018-02-22 22:24 ` [PATCH 12/38] cxlflash: Use IDR to manage adapter contexts Uma Krishnan
2018-02-22 22:24 ` [PATCH 13/38] cxlflash: Support adapter file descriptors for OpenCXL Uma Krishnan
2018-02-22 22:24 ` [PATCH 14/38] cxlflash: Support adapter context discovery Uma Krishnan
2018-02-22 22:24 ` [PATCH 15/38] cxlflash: Support image reload policy modification Uma Krishnan
2018-02-22 22:24 ` [PATCH 16/38] cxlflash: MMIO map the AFU Uma Krishnan
2018-02-22 22:25 ` [PATCH 17/38] cxlflash: Support starting an adapter context Uma Krishnan
2018-02-22 22:25 ` [PATCH 18/38] cxlflash: Support process specific mappings Uma Krishnan
2018-02-22 22:25 ` [PATCH 19/38] cxlflash: Support AFU state toggling Uma Krishnan
2018-02-22 22:25 ` [PATCH 20/38] cxlflash: Support reading adapter VPD data Uma Krishnan
2018-02-22 22:25 ` [PATCH 21/38] cxlflash: Setup function OpenCXL link Uma Krishnan
2018-02-22 22:26 ` [PATCH 22/38] cxlflash: Setup OpenCXL transaction layer Uma Krishnan
2018-02-22 22:26 ` [PATCH 23/38] cxlflash: Support process element lifecycle Uma Krishnan
2018-02-22 22:26 ` [PATCH 24/38] cxlflash: Support AFU interrupt management Uma Krishnan
2018-02-22 22:26 ` [PATCH 25/38] cxlflash: Support AFU interrupt mapping and registration Uma Krishnan
2018-02-22 22:26 ` [PATCH 26/38] cxlflash: Support starting user contexts Uma Krishnan
2018-02-22 22:27 ` [PATCH 27/38] cxlflash: Support adapter context polling Uma Krishnan
2018-02-22 22:27 ` [PATCH 28/38] cxlflash: Support adapter context reading Uma Krishnan
2018-02-22 22:27 ` [PATCH 29/38] cxlflash: Support adapter context mmap and release Uma Krishnan
2018-02-22 22:27 ` [PATCH 30/38] cxlflash: Support file descriptor mapping Uma Krishnan
2018-02-22 22:27 ` [PATCH 31/38] cxlflash: Introduce object handle fop Uma Krishnan
2018-02-22 22:27 ` [PATCH 32/38] cxlflash: Setup LISNs for user contexts Uma Krishnan
2018-02-22 22:27 ` [PATCH 33/38] cxlflash: Setup LISNs for master contexts Uma Krishnan
2018-02-22 22:28 ` [PATCH 34/38] cxlflash: Update synchronous interrupt status bits Uma Krishnan
2018-02-22 22:28 ` [PATCH 35/38] cxlflash: Introduce OCXL context state machine Uma Krishnan
2018-02-22 22:28 ` [PATCH 36/38] cxlflash: Register for translation errors Uma Krishnan
2018-02-22 22:28 ` [PATCH 37/38] cxlflash: Support AFU reset Uma Krishnan
2018-02-22 22:28 ` [PATCH 38/38] cxlflash: Enable OpenCXL operations Uma Krishnan
2018-02-23 4:13 ` [PATCH 00/38] cxlflash: OpenCXL transport support Andrew Donnellan
2018-02-23 18:05 ` Uma Krishnan
2018-02-23 19:38 ` Uma Krishnan
2018-02-26 14:43 ` Matthew R. Ochs
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