From: "Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>
To: linux-scsi@vger.kernel.org,
James.Bottomley@HansenPartnership.com, nab@linux-iscsi.org,
brking@linux.vnet.ibm.com
Cc: hch@infradead.org, mikey@neuling.org, imunsie@au1.ibm.com,
dja@ozlabs.au.ibm.com,
"Manoj N. Kumar" <manoj@linux.vnet.ibm.com>
Subject: [PATCH 1/2] cxlflash: Base superpipe support
Date: Fri, 19 Jun 2015 17:37:53 -0500 [thread overview]
Message-ID: <1434753473-6218-1-git-send-email-mrochs@linux.vnet.ibm.com> (raw)
Add superpipe supporting infrastructure to device driver for the IBM CXL
Flash adapter. This patch allows userspace applications to take advantage
of the accelerated I/O features that this adapter provides and bypass the
traditional filesystem stack.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
---
Documentation/powerpc/cxlflash.txt | 298 ++++++
drivers/scsi/cxlflash/Makefile | 2 +-
drivers/scsi/cxlflash/common.h | 18 +
drivers/scsi/cxlflash/main.c | 12 +
drivers/scsi/cxlflash/superpipe.c | 1856 ++++++++++++++++++++++++++++++++++++
drivers/scsi/cxlflash/superpipe.h | 210 ++++
include/uapi/scsi/cxlflash_ioctl.h | 159 +++
7 files changed, 2554 insertions(+), 1 deletion(-)
create mode 100644 Documentation/powerpc/cxlflash.txt
create mode 100644 drivers/scsi/cxlflash/superpipe.c
create mode 100644 drivers/scsi/cxlflash/superpipe.h
create mode 100644 include/uapi/scsi/cxlflash_ioctl.h
diff --git a/Documentation/powerpc/cxlflash.txt b/Documentation/powerpc/cxlflash.txt
new file mode 100644
index 0000000..c4d3849
--- /dev/null
+++ b/Documentation/powerpc/cxlflash.txt
@@ -0,0 +1,298 @@
+Introduction
+============
+
+ The IBM Power architecture provides support for CAPI (Coherent
+ Accelerator Power Interface), which is available to certain PCIe slots
+ on Power 8 systems. CAPI can be thought of as a special tunneling
+ protocol through PCIe that allow PCIe adapters to look like special
+ purpose co-processors which can read or write an application's
+ memory and generate page faults. As a result, the host interface to
+ an adapter running in CAPI mode does not require the data buffers to
+ be mapped to the device's memory (IOMMU bypass) nor does it require
+ memory to be pinned.
+
+ On Linux, Coherent Accelerator (CXL) kernel services present CAPI
+ devices as a PCI device by implementing a virtual PCI host bridge.
+ This abstraction simplifies the infrastructure and programming
+ model, allowing for drivers to look similar to other native PCI
+ device drivers.
+
+ CXL provides a mechanism by which user space applications can
+ directly talk to a device (network or storage) bypassing the typical
+ kernel/device driver stack. The CXL Flash Adapter Driver enables a
+ user space application direct access to Flash storage.
+
+ The CXL Flash Adapter Driver is a kernel module that sits in the
+ SCSI stack as a low level device driver (below the SCSI disk and
+ protocol drivers) for the IBM CXL Flash Adapter. This driver is
+ responsible for the initialization of the adapter, setting up the
+ special path for user space access, and performing error recovery. It
+ communicates directly the Flash Accelerator Functional Unit (AFU)
+ as described in Documentation/powerpc/cxl.txt.
+
+ The cxlflash driver supports two, mutually exclusive, modes of
+ operation at the device (LUN) level:
+
+ - Any flash device (LUN) can be configured to be accessed as a
+ regular disk device (i.e.: /dev/sdc). This is the default mode.
+
+ - Any flash device (LUN) can be configured to be accessed from
+ user space with a special block library. This mode further
+ specifies the means of accessing the device and provides for
+ either raw access to the entire LUN (referred to as direct
+ or physical LUN access) or access to a kernel/AFU-mediated
+ partition of the LUN (referred to as virtual LUN access). The
+ segmentation of a disk device into virtual LUNs is assisted
+ by special translation services provided by the Flash AFU.
+
+Overview
+========
+
+ The Coherent Accelerator Interface Architecture (CAIA) introduces a
+ concept of a master context. A master typically has special privileges
+ granted to it by the kernel or hypervisor allowing it to perform AFU
+ wide management and control. The master may or may not be involved
+ directly in each user I/O, but at the minimum is involved in the
+ initial setup before the user application is allowed to send requests
+ directly to the AFU.
+
+ The CXL Flash Adapter Driver establishes a master context with the
+ AFU. It uses memory mapped I/O (MMIO) for this control and setup. The
+ Adapter Problem Space Memory Map looks like this:
+
+ +-------------------------------+
+ | 512 * 64 KB User MMIO |
+ | (per context) |
+ | User Accessible |
+ +-------------------------------+
+ | 512 * 128 B per context |
+ | Provisioning and Control |
+ | Trusted Process accessible |
+ +-------------------------------+
+ | 64 KB Global |
+ | Trusted Process accessible |
+ +-------------------------------+
+
+ This driver configures itself into the SCSI software stack as an
+ adapter driver. The driver is the only entity that is considered a
+ Trusted Process to program the Provisioning and Control and Global
+ areas in the MMIO Space shown above. The master context driver
+ discovers all LUNs attached to the CXL Flash adapter and instantiates
+ scsi block devices (/dev/sdb, /dev/sdc etc.) for each unique LUN
+ seen from each path.
+
+ Once these scsi block devices are instantiated, an application
+ written to a specification provided by the block library may get
+ access to the Flash from user space (without requiring a system call).
+
+ This master context driver also provides a series of ioctls for this
+ block library to enable this user space access. The driver supports
+ two modes for accessing the block device.
+
+ The first mode is called a virtual mode. In this mode a single scsi
+ block device (/dev/sdb) may be carved up into any number of distinct
+ virtual LUNs. The virtual LUNs may be resized as long as the sum of
+ the sizes of all the virtual LUNs, along with the meta-data associated
+ with it does not exceed the physical capacity.
+
+ The second mode is called the physical mode. In this mode a single
+ block device (/dev/sdb) may be opened directly by the block library
+ and the entire space for the LUN is available to the application.
+
+ Only the physical mode provides persistence of the data. i.e. The
+ data written to the block device will survive application exit and
+ restart and also reboot. The virtual LUNs do not persist (i.e. do
+ not survive after the application terminates or the system reboots).
+
+
+Block library API
+=================
+
+ Applications intending to get access to the CXL Flash from user
+ space should use the block library, as it abstracts the details of
+ interfacing directly with the cxlflash driver that are necessary for
+ performing administrative actions (i.e.: setup, tear down, resize).
+ The block library can be thought of as a 'user' of services,
+ implemented as IOCTLs, that are provided by the cxlflash driver
+ specifically for devices (LUNs) operating in user space access
+ mode. While it is not a requirement that applications understand
+ the interface between the block library and the cxlflash driver,
+ a high-level overview of each supported service (IOCTL) is provided
+ below.
+
+ The block library can be found on GitHub:
+ http://www.github.com/mikehollinger/ibmcapikv
+
+
+CXL Flash Driver IOCTLs
+=======================
+
+ Users, such as the block library, that wish to interface with a flash
+ device (LUN) via user space access need to use the services provided
+ by the cxlflash driver. As these services are implemented as ioctls,
+ a file descriptor handle must first be obtained in order to establish
+ the communication channel between a user and the kernel. This file
+ descriptor is obtained by opening the device special file associated
+ with the scsi disk device (/dev/sdb) that was created during LUN
+ discovery. As per the location of the cxlflash driver within the
+ SCSI protocol stack, this open is actually not seen by the cxlflash
+ driver. Upon successful open, the user receives a file descriptor
+ (herein referred to as fd1) that should be used for issuing the
+ subsequent ioctls listed below.
+
+ The structure definitions for these IOCTLs are available in:
+ uapi/scsi/cxlflash_ioctl.h
+
+DK_CXLFLASH_ATTACH
+------------------
+
+ This ioctl obtains, initializes, and starts a context using the CXL
+ kernel services. These services specify a context id (u16) by which
+ to uniquely identify the context and its allocated resources. The
+ services additionally provide a second file descriptor (herein
+ referred to as fd2) that is used by the block library to initiate
+ memory mapped I/O (via mmap()) to the CXL flash device and poll for
+ completion events. This file descriptor is intentionally installed by
+ this driver and not the CXL kernel services to allow for intermediary
+ notification and access in the event of a non-user-initiated close(),
+ such as a killed process. This design point is described in further
+ detail in the description for the DK_CXLFLASH_DETACH ioctl.
+
+ There are a few important aspects regarding the "tokens" (context id
+ and fd2) that are provided back to the user:
+
+ - These tokens are only valid for the process under which they
+ were created. The child of a forked process cannot continue
+ to use the context id or file descriptor created by its parent
+ (see DK_CXLFLASH_CLONE for further details).
+
+ - These tokens are only valid for the lifetime of the context and
+ the process under which they were created. Once either is
+ destroyed, the tokens are to be considered stale and subsequent
+ usage will result in errors.
+
+ - When a context is no longer needed, the user shall detach from
+ the context via the DK_CXLFLASH_DETACH ioctl.
+
+ - A close on fd2 will invalidate the tokens. This operation is not
+ required by the user.
+
+DK_CXLFLASH_USER_DIRECT
+-----------------------
+ This ioctl is responsible for transitioning the LUN to direct
+ (physical) mode access and configuring the AFU for direct access from
+ user space on a per-context basis. Additionally, the block size and
+ last logical block address (LBA) are returned to the user.
+
+ As mentioned previously, when operating in user space access mode,
+ LUNs may be accessed in whole or in part. Only one mode is allowed
+ at a time and if one mode is active (outstanding references exist),
+ requests to use the LUN in a different mode are denied.
+
+ The AFU is configured for direct access from user space by adding an
+ entry to the AFU's resource handle table. The index of the entry is
+ treated as a resource handle that is returned to the user. The user
+ is then able to use the handle to reference the LUN during I/O.
+
+DK_CXLFLASH_USER_VIRTUAL
+------------------------
+ This ioctl is responsible for transitioning the LUN to virtual mode
+ of access and configuring the AFU for virtual access from user space
+ on a per-context basis. Additionally, the block size and last logical
+ block address (LBA) are returned to the user.
+
+ As mentioned previously, when operating in user space access mode,
+ LUNs may be accessed in whole or in part. Only one mode is allowed
+ at a time and if one mode is active (outstanding references exist),
+ requests to use the LUN in a different mode are denied.
+
+ The AFU is configured for virtual access from user space by adding
+ an entry to the AFU's resource handle table. The index of the entry
+ is treated as a resource handle that is returned to the user. The
+ user is then able to use the handle to reference the LUN during I/O.
+
+ By default, the virtual LUN is created with a size of 0. The user
+ would need to use the DK_CXLFLASH_VLUN_RESIZE ioctl to adjust the grow
+ the virtual LUN to a desired size. To avoid having to perform this
+ resize for the initial creation of the virtual LUN, the user has the
+ option of specifying a size as part of the DK_CXLFLASH_USER_VIRTUAL
+ ioctl, such that when success is returned to the user, the
+ resource handle that is provided is already referencing provisioned
+ storage. This is reflected by the last LBA being a non-zero value.
+
+DK_CXLFLASH_VLUN_RESIZE
+-----------------------
+ This ioctl is responsible for resizing a previously created virtual
+ LUN and will fail if invoked upon a LUN that is not in virtual
+ mode. Upon success, an updated last LBA is returned to the user
+ indicating the new size of the virtual LUN associated with the
+ resource handle.
+
+ The partitioning of virtual LUNs is jointly mediated by the cxlflash
+ driver and the AFU. An allocation table is kept for each LUN that is
+ operating in the virtual mode and used to program a LUN translation
+ table that the AFU references when provided with a resource handle.
+
+DK_CXLFLASH_RELEASE
+-------------------
+ This ioctl is responsible for releasing a previously obtained
+ reference to either a physical or virtual LUN. This can be
+ thought of as the inverse of the DK_CXLFLASH_USER_DIRECT or
+ DK_CXLFLASH_USER_VIRTUAL ioctls. Upon success, the resource handle
+ is no longer valid and the entry in the resource handle table is
+ made available to be used again.
+
+ As part of the release process for virtual LUNs, the virtual LUN
+ is first resized to 0 to clear out and free the translation tables
+ associated with the virtual LUN reference.
+
+DK_CXLFLASH_DETACH
+------------------
+ This ioctl is responsible for unregistering a context with the
+ cxlflash driver and release outstanding resources that were
+ not explicitly released via the DK_CXLFLASH_RELEASE ioctl. Upon
+ success, all "tokens" which had been provided to the user from the
+ DK_CXLFLASH_ATTACH onward are no longer valid.
+
+DK_CXLFLASH_CLONE
+-----------------
+ This ioctl is responsible for cloning a previously created
+ context to a more recently created context. It exists solely to
+ support maintaining user space access to storage after a process
+ forks. Upon success, the child process (which invoked the ioctl)
+ will have access to the same LUNs via the same resource handle(s)
+ and fd2 as the parent, but under a different context.
+
+ Context sharing across processes is not supported with CXL and
+ therefore each fork must be met with establishing a new context
+ for the child process. This ioctl simplifies the state management
+ and playback required by a user in such a scenario. When a process
+ forks, child process can clone the parents context by first creating
+ a context (via DK_CXLFLASH_ATTACH) and then using this ioctl to
+ perform the clone from the parent to the child.
+
+ The clone itself is fairly simple. The resource handle and lun
+ translation tables are copied from the parent context to the child's
+ and then synced with the AFU.
+
+DK_CXLFLASH_VERIFY
+------------------
+ The DK_CXLFLASH_VERIFY ioctl is used to detect various changes such
+ as the capacity of the disk changing, the number of LUNs visible
+ changing, etc. In cases where the changes affect the application
+ (such as a LUN resize), the cxlflash driver will report the changed
+ state to the application.
+
+DK_CXLFLASH_RECOVER_AFU
+-----------------------
+ This ioctl is used to drive recovery (if such an action is warranted)
+ by resetting the adapter. Any state associated with all the open
+ contexts, will be re-established.
+
+DK_CXLFLASH_MANAGE_LUN
+----------------------
+ This ioctl is used to switch a LUN from a mode where it is available
+ for file-system access (legacy), to a mode where it is set aside for
+ exclusive user space access (superpipe). In case a LUN is visible
+ across multiple ports and adapters, this ioctl is used to uniquely
+ identify each LUN by its World Wide Node Name (WWNN).
diff --git a/drivers/scsi/cxlflash/Makefile b/drivers/scsi/cxlflash/Makefile
index dc95e20..3de309c 100644
--- a/drivers/scsi/cxlflash/Makefile
+++ b/drivers/scsi/cxlflash/Makefile
@@ -1,2 +1,2 @@
obj-$(CONFIG_CXLFLASH) += cxlflash.o
-cxlflash-y += main.o
+cxlflash-y += main.o superpipe.o
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index fe86bfe..9cf9fa3 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -103,6 +103,14 @@ struct cxlflash_cfg {
struct pci_pool *cxlflash_cmd_pool;
struct pci_dev *parent_dev;
+ spinlock_t ctx_tbl_slock;
+ struct ctx_info *ctx_tbl[MAX_CONTEXT];
+ struct list_head ctx_err_recovery; /* contexts w/ recovery pending */
+ struct file_operations cxl_fops;
+
+ int num_user_contexts;
+ int last_lun_index[CXLFLASH_NUM_FC_PORTS];
+
wait_queue_head_t tmf_waitq;
bool tmf_active;
u8 err_recovery_active:1;
@@ -177,5 +185,15 @@ int cxlflash_afu_reset(struct cxlflash_cfg *);
struct afu_cmd *cxlflash_cmd_checkout(struct afu *);
void cxlflash_cmd_checkin(struct afu_cmd *);
int cxlflash_afu_sync(struct afu *, ctx_hndl_t, res_hndl_t, u8);
+int cxlflash_alloc_lun(struct scsi_device *);
+void cxlflash_init_lun(struct scsi_device *);
+void cxlflash_list_init(void);
+void cxlflash_list_terminate(void);
+int cxlflash_slave_alloc(struct scsi_device *);
+int cxlflash_slave_configure(struct scsi_device *);
+void cxlflash_slave_destroy(struct scsi_device *);
+int cxlflash_ioctl(struct scsi_device *, int, void __user *);
+int cxlflash_mark_contexts_error(struct cxlflash_cfg *);
+
#endif /* ifndef _CXLFLASH_COMMON_H */
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 76a7286..2773177 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -679,10 +679,13 @@ static struct scsi_host_template driver_template = {
.module = THIS_MODULE,
.name = CXLFLASH_ADAPTER_NAME,
.info = cxlflash_driver_info,
+ .ioctl = cxlflash_ioctl,
.proc_name = CXLFLASH_NAME,
.queuecommand = cxlflash_queuecommand,
.eh_device_reset_handler = cxlflash_eh_device_reset_handler,
.eh_host_reset_handler = cxlflash_eh_host_reset_handler,
+ .slave_alloc = cxlflash_slave_alloc,
+ .slave_configure = cxlflash_slave_configure,
.change_queue_depth = cxlflash_change_queue_depth,
.cmd_per_lun = 16,
.can_queue = CXLFLASH_MAX_CMDS,
@@ -2198,9 +2201,12 @@ static int cxlflash_probe(struct pci_dev *pdev,
cfg->init_state = INIT_STATE_NONE;
cfg->dev = pdev;
+ cfg->last_lun_index[0] = 0;
+ cfg->last_lun_index[1] = 0;
cfg->dev_id = (struct pci_device_id *)dev_id;
cfg->mcctx = NULL;
cfg->err_recovery_active = 0;
+ cfg->num_user_contexts = 0;
init_waitqueue_head(&cfg->tmf_waitq);
init_waitqueue_head(&cfg->eeh_waitq);
@@ -2208,6 +2214,8 @@ static int cxlflash_probe(struct pci_dev *pdev,
INIT_WORK(&cfg->work_q, cxlflash_worker_thread);
cfg->lr_state = LINK_RESET_INVALID;
cfg->lr_port = -1;
+ spin_lock_init(&cfg->ctx_tbl_slock);
+ INIT_LIST_HEAD(&cfg->ctx_err_recovery);
pci_set_drvdata(pdev, cfg);
@@ -2279,6 +2287,8 @@ static int __init init_cxlflash(void)
pr_info("%s: IBM Power CXL Flash Adapter: %s\n",
__func__, CXLFLASH_DRIVER_DATE);
+ cxlflash_list_init();
+
return pci_register_driver(&cxlflash_driver);
}
@@ -2287,6 +2297,8 @@ static int __init init_cxlflash(void)
*/
static void __exit exit_cxlflash(void)
{
+ cxlflash_list_terminate();
+
pci_unregister_driver(&cxlflash_driver);
}
diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c
new file mode 100644
index 0000000..4ea6c72
--- /dev/null
+++ b/drivers/scsi/cxlflash/superpipe.c
@@ -0,0 +1,1856 @@
+/*
+ * CXL Flash Device Driver
+ *
+ * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
+ * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) 2015 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/file.h>
+#include <linux/moduleparam.h>
+#include <linux/syscalls.h>
+#include <misc/cxl.h>
+#include <asm/unaligned.h>
+
+#include <scsi/scsi_host.h>
+#include <uapi/scsi/cxlflash_ioctl.h>
+
+#include "sislite.h"
+#include "common.h"
+#include "superpipe.h"
+
+struct cxlflash_global global;
+
+/**
+ * marshall_det_to_rele() - translate detach to release structure
+ * @detach: Destination structure for the translate/copy.
+ * @rele: Source structure from which to translate/copy.
+ */
+static void marshall_det_to_rele(struct dk_cxlflash_detach *detach,
+ struct dk_cxlflash_release *release)
+{
+ release->hdr = detach->hdr;
+ release->context_id = detach->context_id;
+}
+
+/**
+ * create_lun_info() - allocate and initialize a LUN information structure
+ * @sdev: SCSI device associated with LUN.
+ *
+ * Return: Allocated lun_info structure on success, NULL on failure
+ */
+static struct lun_info *create_lun_info(struct scsi_device *sdev)
+{
+ struct lun_info *lun_info = NULL;
+
+ lun_info = kzalloc(sizeof(*lun_info), GFP_KERNEL);
+ if (unlikely(!lun_info)) {
+ pr_err("%s: could not allocate lun_info\n", __func__);
+ goto create_lun_info_exit;
+ }
+
+ lun_info->sdev = sdev;
+
+ spin_lock_init(&lun_info->slock);
+
+create_lun_info_exit:
+ return lun_info;
+}
+
+/**
+ * lookup_lun() - find or create a LUN information structure
+ * @sdev: SCSI device associated with LUN.
+ * @wwid: WWID associated with LUN.
+ *
+ * Return: Found/Allocated lun_info structure on success, NULL on failure
+ */
+static struct lun_info *lookup_lun(struct scsi_device *sdev, __u8 *wwid)
+{
+ struct lun_info *lun_info, *temp;
+ ulong flags = 0UL;
+
+ if (wwid)
+ list_for_each_entry_safe(lun_info, temp, &global.luns, list) {
+ if (!memcmp(lun_info->wwid, wwid,
+ DK_CXLFLASH_MANAGE_LUN_WWID_LEN))
+ return lun_info;
+ }
+
+ lun_info = create_lun_info(sdev);
+ if (unlikely(!lun_info))
+ goto out;
+
+ spin_lock_irqsave(&global.slock, flags);
+ if (wwid)
+ memcpy(lun_info->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN);
+ list_add(&lun_info->list, &global.luns);
+ spin_unlock_irqrestore(&global.slock, flags);
+
+out:
+ pr_debug("%s: returning %p\n", __func__, lun_info);
+ return lun_info;
+}
+
+/**
+ * cxlflash_slave_alloc() - allocate and associate LUN information structure
+ * @sdev: SCSI device associated with LUN.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int cxlflash_slave_alloc(struct scsi_device *sdev)
+{
+ int rc = 0;
+ struct lun_info *lun_info = NULL;
+
+ lun_info = lookup_lun(sdev, NULL);
+ if (unlikely(!lun_info)) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ sdev->hostdata = lun_info;
+
+out:
+ pr_debug("%s: returning sdev %p rc=%d\n", __func__, sdev, rc);
+ return rc;
+}
+
+/**
+ * cxlflash_slave_configure() - configure and make device aware of LUN
+ * @sdev: SCSI device associated with LUN.
+ *
+ * Stores the LUN id and lun_index and programs the AFU's LUN mapping table.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int cxlflash_slave_configure(struct scsi_device *sdev)
+{
+ struct Scsi_Host *shost = sdev->host;
+ struct lun_info *lun_info = sdev->hostdata;
+ struct cxlflash_cfg *cfg = shost_priv(shost);
+ struct afu *afu = cfg->afu;
+
+ pr_debug("%s: id = %d/%d/%d/%llu\n", __func__, shost->host_no,
+ sdev->channel, sdev->id, sdev->lun);
+
+ /* Store off lun in unpacked, AFU-friendly format */
+ lun_info->lun_id = lun_to_lunid(sdev->lun);
+ lun_info->lun_index = cfg->last_lun_index[sdev->channel];
+
+ writeq_be(lun_info->lun_id,
+ &afu->afu_map->global.fc_port[sdev->channel]
+ [cfg->last_lun_index[sdev->channel]++]);
+
+ return 0;
+}
+
+/**
+ * cxlflash_list_init() - initializes the global LUN list
+ */
+void cxlflash_list_init(void)
+{
+ INIT_LIST_HEAD(&global.luns);
+ spin_lock_init(&global.slock);
+ global.err_page = NULL;
+}
+
+/**
+ * cxlflash_list_terminate() - frees resources associated with global LUN list
+ */
+void cxlflash_list_terminate(void)
+{
+ struct lun_info *lun_info, *temp;
+ ulong flags = 0;
+
+ spin_lock_irqsave(&global.slock, flags);
+ list_for_each_entry_safe(lun_info, temp, &global.luns, list) {
+ list_del(&lun_info->list);
+ kfree(lun_info);
+ }
+
+ if (global.err_page) {
+ __free_page(global.err_page);
+ global.err_page = NULL;
+ }
+ spin_unlock_irqrestore(&global.slock, flags);
+}
+
+/**
+ * find_error_context() - locates a context by cookie on the error recovery list
+ * @cfg: Internal structure associated with the host.
+ * @ctxid: Desired context.
+ *
+ * Return: Found context on success, NULL on failure
+ */
+static struct ctx_info *find_error_context(struct cxlflash_cfg *cfg, u64 ctxid)
+{
+ struct ctx_info *ctx_info;
+
+ list_for_each_entry(ctx_info, &cfg->ctx_err_recovery, list)
+ if (ctx_info->ctxid == ctxid)
+ return ctx_info;
+
+ return NULL;
+}
+
+/**
+ * get_context() - obtains a validated context reference
+ * @cfg: Internal structure associated with the host.
+ * @ctxid: Desired context.
+ * @lun_info: LUN associated with request.
+ * @ctx_ctrl: Control information to 'steer' desired lookup.
+ *
+ * NOTE: despite the name pid, in linux, current->pid actually refers
+ * to the lightweight process id (tid) and can change if the process is
+ * multi threaded. The tgid remains constant for the process and only changes
+ * when the process of fork. For all intents and purposes, think of tgid
+ * as a pid in the traditional sense.
+ *
+ * Return: Validated context on success, NULL on failure
+ */
+struct ctx_info *get_context(struct cxlflash_cfg *cfg, u64 ctxid,
+ struct lun_info *lun_info, enum ctx_ctrl ctx_ctrl)
+{
+ struct ctx_info *ctx_info = NULL;
+ struct lun_access *lun_access = NULL;
+ bool found = false;
+ pid_t pid = current->tgid, ctxpid = 0;
+ ulong flags = 0;
+
+ if (unlikely(ctx_ctrl & CTX_CTRL_CLONE))
+ pid = current->parent->tgid;
+
+ if (likely(ctxid < MAX_CONTEXT)) {
+ spin_lock_irqsave(&cfg->ctx_tbl_slock, flags);
+ ctx_info = cfg->ctx_tbl[ctxid];
+
+ if (unlikely(ctx_ctrl & CTX_CTRL_ERR))
+ ctx_info = find_error_context(cfg, ctxid);
+ if (unlikely(!ctx_info)) {
+ if (ctx_ctrl & CTX_CTRL_ERR_FALLBACK) {
+ ctx_info = find_error_context(cfg, ctxid);
+ if (ctx_info)
+ goto found_context;
+ }
+ spin_unlock_irqrestore(&cfg->ctx_tbl_slock, flags);
+ goto out;
+ }
+found_context:
+ /*
+ * Increment the reference count under lock so the context
+ * is not yanked from under us on a removal thread.
+ */
+ atomic_inc(&ctx_info->nrefs);
+ spin_unlock_irqrestore(&cfg->ctx_tbl_slock, flags);
+
+ ctxpid = ctx_info->pid;
+ if (likely(!(ctx_ctrl & CTX_CTRL_NOPID)))
+ if (pid != ctxpid)
+ goto denied;
+
+ if (likely(lun_info)) {
+ list_for_each_entry(lun_access, &ctx_info->luns, list)
+ if (lun_access->lun_info == lun_info) {
+ found = true;
+ break;
+ }
+
+ if (!found)
+ goto denied;
+ }
+ }
+
+out:
+ pr_debug("%s: ctxid=%llu ctxinfo=%p ctxpid=%u pid=%u ctx_ctrl=%u "
+ "found=%d\n", __func__, ctxid, ctx_info, ctxpid, pid,
+ ctx_ctrl, found);
+
+ return ctx_info;
+
+denied:
+ atomic_dec(&ctx_info->nrefs);
+ ctx_info = NULL;
+ goto out;
+}
+
+/**
+ * afu_attach() - attach a context to the AFU
+ * @cfg: Internal structure associated with the host.
+ * @ctx_info: Context to attach.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int afu_attach(struct cxlflash_cfg *cfg, struct ctx_info *ctx_info)
+{
+ struct afu *afu = cfg->afu;
+ int rc = 0;
+ u64 reg;
+
+ /* Restrict user to read/write cmds in translated mode */
+ (void)readq_be(&ctx_info->ctrl_map->mbox_r); /* unlock ctx_cap */
+ writeq_be((SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD),
+ &ctx_info->ctrl_map->ctx_cap);
+
+ reg = readq_be(&ctx_info->ctrl_map->ctx_cap);
+
+ /* if the write failed, the ctx must have been
+ * closed since the mbox read and the ctx_cap
+ * register locked up. Fail the registration.
+ */
+ if (reg != (SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD)) {
+ pr_err("%s: ctx may be closed reg=%llx\n", __func__, reg);
+ rc = -EAGAIN;
+ goto out;
+ }
+
+ /* set up MMIO registers pointing to the RHT */
+ writeq_be((u64)ctx_info->rht_start, &ctx_info->ctrl_map->rht_start);
+ writeq_be(SISL_RHT_CNT_ID((u64)MAX_RHT_PER_CONTEXT,
+ (u64)(afu->ctx_hndl)),
+ &ctx_info->ctrl_map->rht_cnt_id);
+out:
+ pr_debug("%s: returning rc=%d\n", __func__, rc);
+ return rc;
+
+}
+
+/**
+ * cxlflash_check_status() - evaluates the status of an AFU command
+ * @ioasa: The IOASA of an AFU command.
+ *
+ * Return: 1 when IOASA has error, 0 when IOASA does not have an error
+ */
+int cxlflash_check_status(struct afu_cmd *cmd)
+{
+ struct sisl_ioasa *ioasa = &cmd->sa;
+ ulong lock_flags;
+
+ /* not retrying afu timeouts (B_TIMEOUT) */
+ /* returns 1 if the cmd should be retried, 0 otherwise */
+ /* sets B_ERROR flag based on IOASA */
+
+ if (ioasa->ioasc == 0)
+ return 0;
+
+ spin_lock_irqsave(&cmd->slock, lock_flags);
+ ioasa->host_use_b[0] |= B_ERROR;
+ spin_unlock_irqrestore(&cmd->slock, lock_flags);
+
+ if (!(ioasa->host_use_b[1]++ < MC_RETRY_CNT))
+ return 0;
+
+ switch (ioasa->rc.afu_rc) {
+ case SISL_AFU_RC_NO_CHANNELS:
+ case SISL_AFU_RC_OUT_OF_DATA_BUFS:
+ msleep(20);
+ return 1;
+
+ case 0:
+ /* no afu_rc, but either scsi_rc and/or fc_rc is set */
+ /* retry all scsi_rc and fc_rc after a small delay */
+ msleep(20);
+ return 1;
+ }
+
+ return 0;
+}
+
+/**
+ * read_cap16() - issues a SCSI READ_CAP16 command
+ * @afu: AFU associated with the host.
+ * @lun_info: LUN to destined for capacity request.
+ * @port_sel: Port to send request.
+ *
+ * Return: 0 on success, -1 on failure
+ */
+static int read_cap16(struct afu *afu, struct lun_info *lun_info, u32 port_sel)
+{
+ struct afu_cmd *cmd = NULL;
+ int rc = 0;
+
+ cmd = cxlflash_cmd_checkout(afu);
+ if (unlikely(!cmd)) {
+ pr_err("%s: could not get a free command\n", __func__);
+ return -1;
+ }
+
+ cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID |
+ SISL_REQ_FLAGS_SUP_UNDERRUN |
+ SISL_REQ_FLAGS_HOST_READ);
+
+ cmd->rcb.port_sel = port_sel;
+ cmd->rcb.lun_id = lun_info->lun_id;
+ cmd->rcb.data_len = CMD_BUFSIZE;
+ cmd->rcb.data_ea = (u64) cmd->buf;
+ cmd->rcb.timeout = MC_DISCOVERY_TIMEOUT;
+
+ cmd->rcb.cdb[0] = 0x9E; /* read cap(16) */
+ cmd->rcb.cdb[1] = 0x10; /* service action */
+ put_unaligned_be32(CMD_BUFSIZE, &cmd->rcb.cdb[10]);
+
+ pr_debug("%s: sending cmd(0x%x) with RCB EA=%p data EA=0x%llx\n",
+ __func__, cmd->rcb.cdb[0], &cmd->rcb, cmd->rcb.data_ea);
+
+ do {
+ rc = cxlflash_send_cmd(afu, cmd);
+ if (unlikely(rc))
+ goto out;
+ cxlflash_wait_resp(afu, cmd);
+ } while (cxlflash_check_status(cmd));
+
+ if (unlikely(cmd->sa.host_use_b[0] & B_ERROR)) {
+ pr_err("%s: command failed\n", __func__);
+ rc = -1;
+ goto out;
+ }
+
+ /*
+ * Read cap was successful, grab values from the buffer;
+ * note that we don't need to worry about unaligned access
+ * as the buffer is allocated on an aligned boundary.
+ */
+ spin_lock(&lun_info->slock);
+ lun_info->max_lba = swab64(*((u64 *)&cmd->buf[0]));
+ lun_info->blk_len = swab32(*((u32 *)&cmd->buf[8]));
+ spin_unlock(&lun_info->slock);
+
+out:
+ if (cmd)
+ cxlflash_cmd_checkin(cmd);
+ pr_debug("%s: maxlba=%lld blklen=%d pcmd %p\n",
+ __func__, lun_info->max_lba, lun_info->blk_len, cmd);
+ return rc;
+}
+
+/**
+ * get_rhte() - obtains validated resource handle table entry reference
+ * @ctx_info: Context owning the resource handle.
+ * @res_hndl: Resource handle associated with entry.
+ * @lun_info: LUN associated with request.
+ *
+ * Return: Validated RHTE on success, NULL on failure
+ */
+struct sisl_rht_entry *get_rhte(struct ctx_info *ctx_info, res_hndl_t res_hndl,
+ struct lun_info *lun_info)
+{
+ struct sisl_rht_entry *rhte = NULL;
+
+ if (unlikely(!ctx_info->rht_start)) {
+ pr_err("%s: Context does not have an allocated RHT!\n",
+ __func__);
+ goto out;
+ }
+
+ if (unlikely(res_hndl >= MAX_RHT_PER_CONTEXT)) {
+ pr_err("%s: Invalid resource handle! (%d)\n",
+ __func__, res_hndl);
+ goto out;
+ }
+
+ if (unlikely(ctx_info->rht_lun[res_hndl] != lun_info)) {
+ pr_err("%s: Resource handle invalid for LUN! (%d)\n",
+ __func__, res_hndl);
+ goto out;
+ }
+
+ rhte = &ctx_info->rht_start[res_hndl];
+ if (unlikely(rhte->nmask == 0)) {
+ pr_err("%s: Unopened resource handle! (%d)\n",
+ __func__, res_hndl);
+ rhte = NULL;
+ goto out;
+ }
+
+out:
+ return rhte;
+}
+
+/**
+ * rhte_checkout() - obtains free/empty resource handle table entry
+ * @ctx_info: Context owning the resource handle.
+ * @lun_info: LUN associated with request.
+ *
+ * Return: Free RHTE on success, NULL on failure
+ */
+struct sisl_rht_entry *rhte_checkout(struct ctx_info *ctx_info,
+ struct lun_info *lun_info)
+{
+ struct sisl_rht_entry *rht_entry = NULL;
+ int i;
+
+ /* Find a free RHT entry */
+ for (i = 0; i < MAX_RHT_PER_CONTEXT; i++)
+ if (ctx_info->rht_start[i].nmask == 0) {
+ rht_entry = &ctx_info->rht_start[i];
+ ctx_info->rht_out++;
+ break;
+ }
+
+ if (likely(rht_entry))
+ ctx_info->rht_lun[i] = lun_info;
+
+ pr_debug("%s: returning rht_entry=%p (%d)\n", __func__, rht_entry, i);
+ return rht_entry;
+}
+
+/**
+ * rhte_checkin() - releases a resource handle table entry
+ * @ctx_info: Context owning the resource handle.
+ * @rht_entry: RHTE to release.
+ */
+void rhte_checkin(struct ctx_info *ctx_info,
+ struct sisl_rht_entry *rht_entry)
+{
+ rht_entry->nmask = 0;
+ rht_entry->fp = 0;
+ ctx_info->rht_out--;
+ ctx_info->rht_lun[rht_entry - ctx_info->rht_start] = NULL;
+}
+
+/**
+ * rhte_format1() - populates a RHTE for format 1
+ * @rht_entry: RHTE to populate.
+ * @lun_id: LUN ID of LUN associated with RHTE.
+ * @perm: Desired permissions for RHTE.
+ */
+static void rht_format1(struct sisl_rht_entry *rht_entry, u64 lun_id, u32 perm)
+{
+ /*
+ * Populate the Format 1 RHT entry for direct access (physical
+ * LUN) using the synchronization sequence defined in the
+ * SISLite specification.
+ */
+ struct sisl_rht_entry_f1 dummy = { 0 };
+ struct sisl_rht_entry_f1 *rht_entry_f1 =
+ (struct sisl_rht_entry_f1 *)rht_entry;
+ memset(rht_entry_f1, 0, sizeof(struct sisl_rht_entry_f1));
+ rht_entry_f1->fp = SISL_RHT_FP(1U, 0);
+ smp_wmb(); /* Make setting of format bit visible */
+
+ rht_entry_f1->lun_id = lun_id;
+ smp_wmb(); /* Make setting of LUN id visible */
+
+ /*
+ * Use a dummy RHT Format 1 entry to build the second dword
+ * of the entry that must be populated in a single write when
+ * enabled (valid bit set to TRUE).
+ */
+ dummy.valid = 0x80;
+ dummy.fp = SISL_RHT_FP(1U, perm);
+ dummy.port_sel = BOTH_PORTS;
+ rht_entry_f1->dw = dummy.dw;
+
+ smp_wmb(); /* Make remaining RHT entry fields visible */
+}
+
+/**
+ * cxlflash_lun_attach() - attaches a user to a LUN and manages the LUN's mode
+ * @lun_info: LUN to attach.
+ * @mode: Desired mode of the LUN.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int cxlflash_lun_attach(struct lun_info *lun_info, enum lun_mode mode)
+{
+ int rc = 0;
+
+ spin_lock(&lun_info->slock);
+ if (lun_info->mode == MODE_NONE)
+ lun_info->mode = mode;
+ else if (lun_info->mode != mode) {
+ pr_err("%s: LUN operating in mode %d, requested mode %d\n",
+ __func__, lun_info->mode, mode);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ lun_info->users++;
+ BUG_ON(lun_info->users <= 0);
+out:
+ pr_debug("%s: Returning rc=%d li_mode=%u li_users=%u\n",
+ __func__, rc, lun_info->mode, lun_info->users);
+ spin_unlock(&lun_info->slock);
+ return rc;
+}
+
+/**
+ * cxlflash_lun_detach() - detaches a user from a LUN and resets the LUN's mode
+ * @lun_info: LUN to detach.
+ */
+void cxlflash_lun_detach(struct lun_info *lun_info)
+{
+ spin_lock(&lun_info->slock);
+ if (--lun_info->users == 0)
+ lun_info->mode = MODE_NONE;
+ pr_debug("%s: li_users=%u\n", __func__, lun_info->users);
+ BUG_ON(lun_info->users < 0);
+ spin_unlock(&lun_info->slock);
+}
+
+/**
+ * cxlflash_disk_release() - releases the specified resource entry
+ * @sdev: SCSI device associated with LUN.
+ * @release: Release ioctl data structure.
+ *
+ * For LUN's in virtual mode, the virtual lun associated with the specified
+ * resource handle is resized to 0 prior to releasing the RHTE.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int cxlflash_disk_release(struct scsi_device *sdev,
+ struct dk_cxlflash_release *release)
+{
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct lun_info *lun_info = sdev->hostdata;
+ struct afu *afu = cfg->afu;
+
+ res_hndl_t res_hndl = release->rsrc_handle;
+
+ int rc = 0;
+ u64 ctxid = DECODE_CTXID(release->context_id);
+
+ struct ctx_info *ctx_info = NULL;
+ struct sisl_rht_entry *rht_entry;
+ struct sisl_rht_entry_f1 *rht_entry_f1;
+
+ pr_debug("%s: ctxid=%llu res_hndl=0x%llx li->mode=%u li->users=%u\n",
+ __func__, ctxid, release->rsrc_handle, lun_info->mode,
+ lun_info->users);
+
+ ctx_info = get_context(cfg, ctxid, lun_info, 0);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Invalid context! (%llu)\n", __func__, ctxid);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rht_entry = get_rhte(ctx_info, res_hndl, lun_info);
+ if (unlikely(!rht_entry)) {
+ pr_err("%s: Invalid resource handle! (%d)\n",
+ __func__, res_hndl);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * Resize to 0 for virtual LUNS by setting the size
+ * to 0. This will clear LXT_START and LXT_CNT fields
+ * in the RHT entry and properly sync with the AFU.
+ *
+ * Afterwards we clear the remaining fields.
+ */
+ switch (lun_info->mode) {
+ case MODE_PHYSICAL:
+ /*
+ * Clear the Format 1 RHT entry for direct access
+ * (physical LUN) using the synchronization sequence
+ * defined in the SISLite specification.
+ */
+ rht_entry_f1 = (struct sisl_rht_entry_f1 *)rht_entry;
+
+ rht_entry_f1->valid = 0;
+ smp_wmb(); /* Make revocation of RHT entry visible */
+
+ rht_entry_f1->lun_id = 0;
+ smp_wmb(); /* Make clearing of LUN id visible */
+
+ rht_entry_f1->dw = 0;
+ smp_wmb(); /* Make RHT entry bottom-half clearing visible */
+
+ cxlflash_afu_sync(afu, ctxid, res_hndl, AFU_HW_SYNC);
+ break;
+ default:
+ BUG();
+ goto out;
+ }
+
+ rhte_checkin(ctx_info, rht_entry);
+ cxlflash_lun_detach(lun_info);
+
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ pr_debug("%s: returning rc=%d\n", __func__, rc);
+ return rc;
+}
+
+/**
+ * destroy_context() - releases a context
+ * @cfg: Internal structure associated with the host.
+ * @ctx_info: Context to release.
+ *
+ * Note that the rht_lun member of the context was cut from a single
+ * allocation when the context was created and therefore does not need
+ * to be explicitly freed.
+ */
+static void destroy_context(struct cxlflash_cfg *cfg,
+ struct ctx_info *ctx_info)
+{
+ BUG_ON(!list_empty(&ctx_info->luns));
+
+ /* Clear RHT registers and drop all capabilities for this context */
+ writeq_be(0, &ctx_info->ctrl_map->rht_start);
+ writeq_be(0, &ctx_info->ctrl_map->rht_cnt_id);
+ writeq_be(0, &ctx_info->ctrl_map->ctx_cap);
+
+ /* Free the RHT memory */
+ free_page((ulong)ctx_info->rht_start);
+
+ /* Free the context; note that rht_lun was allocated at same time */
+ kfree(ctx_info);
+ cfg->num_user_contexts--;
+}
+
+/**
+ * create_context() - allocates and initializes a context
+ * @cfg: Internal structure associated with the host.
+ * @ctx: Previously obtained CXL context reference.
+ * @ctxid: Previously obtained process element associated with CXL context.
+ * @adap_fd: Previously obtained adapter fd associated with CXL context.
+ * @perms: User-specified permissions.
+ *
+ * Return: Allocated context on success, NULL on failure
+ */
+static struct ctx_info *create_context(struct cxlflash_cfg *cfg,
+ struct cxl_context *ctx, int ctxid,
+ int adap_fd, u32 perms)
+{
+ char *tmp = NULL;
+ size_t size;
+ struct afu *afu = cfg->afu;
+ struct ctx_info *ctx_info = NULL;
+ struct sisl_rht_entry *rht;
+
+ size = ((MAX_RHT_PER_CONTEXT * sizeof(*ctx_info->rht_lun)) +
+ sizeof(*ctx_info));
+
+ tmp = kzalloc(size, GFP_KERNEL);
+ if (unlikely(!tmp)) {
+ pr_err("%s: Unable to allocate context! (%ld)\n",
+ __func__, size);
+ goto out;
+ }
+
+ rht = (struct sisl_rht_entry *)get_zeroed_page(GFP_KERNEL);
+ if (unlikely(!rht)) {
+ pr_err("%s: Unable to allocate RHT!\n", __func__);
+ goto err;
+ }
+
+ ctx_info = (struct ctx_info *)tmp;
+ ctx_info->rht_lun = (struct lun_info **)(tmp + sizeof(*ctx_info));
+ ctx_info->rht_start = rht;
+ ctx_info->rht_perms = perms;
+
+ ctx_info->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl;
+ ctx_info->ctxid = ENCODE_CTXID(ctx_info, ctxid);
+ ctx_info->lfd = adap_fd;
+ ctx_info->pid = current->tgid; /* tgid = pid */
+ ctx_info->ctx = ctx;
+ INIT_LIST_HEAD(&ctx_info->luns);
+ INIT_LIST_HEAD(&ctx_info->luns);
+ atomic_set(&ctx_info->nrefs, 1);
+
+ cfg->num_user_contexts++;
+
+out:
+ return ctx_info;
+
+err:
+ kfree(tmp);
+ goto out;
+}
+
+/**
+ * cxlflash_disk_detach() - detaches a LUN from a context
+ * @sdev: SCSI device associated with LUN.
+ * @detach: Detach ioctl data structure.
+ *
+ * As part of the detach, all per-context resources associated with the LUN
+ * are cleaned up. When detaching the last LUN for a context, the context
+ * itself is cleaned up and released.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_disk_detach(struct scsi_device *sdev,
+ struct dk_cxlflash_detach *detach)
+{
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct lun_info *lun_info = sdev->hostdata;
+ struct lun_access *lun_access, *t;
+ struct dk_cxlflash_release rel;
+ struct ctx_info *ctx_info = NULL;
+
+ int i;
+ int rc = 0;
+ int lfd;
+ u64 ctxid = DECODE_CTXID(detach->context_id);
+ ulong flags = 0;
+
+ pr_debug("%s: ctxid=%llu\n", __func__, ctxid);
+
+ ctx_info = get_context(cfg, ctxid, lun_info, 0);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Invalid context! (%llu)\n", __func__, ctxid);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ /* Cleanup outstanding resources tied to this LUN */
+ if (ctx_info->rht_out) {
+ marshall_det_to_rele(detach, &rel);
+ for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) {
+ if (ctx_info->rht_lun[i] == lun_info) {
+ rel.rsrc_handle = i;
+ cxlflash_disk_release(sdev, &rel);
+ }
+
+ /* No need to loop further if we're done */
+ if (ctx_info->rht_out == 0)
+ break;
+ }
+ }
+
+ /* Take our LUN out of context, free the node */
+ list_for_each_entry_safe(lun_access, t, &ctx_info->luns, list)
+ if (lun_access->lun_info == lun_info) {
+ list_del(&lun_access->list);
+ kfree(lun_access);
+ lun_access = NULL;
+ break;
+ }
+
+ /* Tear down context following last LUN cleanup */
+ if (list_empty(&ctx_info->luns)) {
+ spin_lock_irqsave(&cfg->ctx_tbl_slock, flags);
+ cfg->ctx_tbl[ctxid] = NULL;
+ spin_unlock_irqrestore(&cfg->ctx_tbl_slock, flags);
+
+ while (atomic_read(&ctx_info->nrefs) > 1) {
+ pr_debug("%s: waiting on threads... (%d)\n",
+ __func__, atomic_read(&ctx_info->nrefs));
+ cpu_relax();
+ }
+
+ lfd = ctx_info->lfd;
+ destroy_context(cfg, ctx_info);
+ ctx_info = NULL;
+
+ /*
+ * As a last step, clean up external resources when not
+ * already on an external cleanup thread, ie: close(adap_fd).
+ *
+ * NOTE: this will free up the context from the CXL services,
+ * allowing it to dole out the same context_id on a future
+ * (or even currently in-flight) disk_attach operation.
+ */
+ if (lfd != -1)
+ sys_close(lfd);
+ }
+
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ pr_debug("%s: returning rc=%d\n", __func__, rc);
+ return rc;
+}
+
+/**
+ * cxlflash_cxl_release() - release handler for adapter file descriptor
+ * @inode: Filesystem inode associated with fd.
+ * @file: File installed with adapter file descriptor.
+ *
+ * This routine is the release handler for the fops registered with
+ * the CXL services on an initial attach for a context. It is called
+ * when a close is performed on the adapter file descriptor returned
+ * to the user. Programmatically, the user is not required to perform
+ * the close, as it is handled internally via the detach ioctl when
+ * a context is being removed. Note that nothing prevents the user
+ * from performing a close, but the user should be aware that doing
+ * so is considered catastrophic and subsequent usage of the superpipe
+ * API with previously saved off tokens will fail.
+ *
+ * When initiated from an external close (either by the user or via
+ * a process tear down), the routine derives the context reference
+ * and calls detach for each LUN associated with the context. The
+ * final detach operation will cause the context itself to be freed.
+ * Note that the saved off lfd is reset prior to calling detach to
+ * signify that the final detach should not perform a close.
+ *
+ * When initiated from a detach operation as part of the tear down
+ * of a context, the context is first completely freed and then the
+ * close is performed. This routine will fail to derive the context
+ * reference (due to the context having already been freed) and then
+ * call into the CXL release entry point.
+ *
+ * Thus, with exception to when the CXL process element (context id)
+ * lookup fails (a case that should theoretically never occur), every
+ * call into this routine results in a complete freeing of a context.
+ *
+ * As part of the detach, all per-context resources associated with the LUN
+ * are cleaned up. When detaching the last LUN for a context, the context
+ * itself is cleaned up and released.
+ *
+ * Return: 0 on success
+ */
+static int cxlflash_cxl_release(struct inode *inode, struct file *file)
+{
+ struct cxl_context *ctx = cxl_fops_get_context(file);
+ struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg,
+ cxl_fops);
+ struct ctx_info *ctx_info = NULL;
+ struct dk_cxlflash_detach detach = { { 0 }, 0 };
+ struct lun_access *lun_access, *t;
+ int ctxid;
+
+ ctxid = cxl_process_element(ctx);
+ if (unlikely(ctxid < 0)) {
+ pr_err("%s: Context %p was closed! (%d)\n",
+ __func__, ctx, ctxid);
+ goto out;
+ }
+
+ ctx_info = get_context(cfg, ctxid, NULL, 0);
+ if (unlikely(!ctx_info)) {
+ ctx_info = get_context(cfg, ctxid, NULL, CTX_CTRL_CLONE);
+ if (!ctx_info) {
+ pr_debug("%s: Context %d already free!\n",
+ __func__, ctxid);
+ goto out_release;
+ }
+
+ pr_debug("%s: Another process owns context %d!\n",
+ __func__, ctxid);
+ goto out;
+ }
+
+ pr_debug("%s: close(%d) for context %d\n",
+ __func__, ctx_info->lfd, ctxid);
+
+ /* Reset the file descriptor to indicate we're on a close() thread */
+ ctx_info->lfd = -1;
+ detach.context_id = ctx_info->ctxid;
+ atomic_dec(&ctx_info->nrefs); /* fix up reference count */
+ list_for_each_entry_safe(lun_access, t, &ctx_info->luns, list)
+ cxlflash_disk_detach(lun_access->sdev, &detach);
+
+ /*
+ * Don't reference lun_access, or t (or ctx_info for that matter, even
+ * though it's invalidated to appease the reference counting code).
+ */
+ ctx_info = NULL;
+
+out_release:
+ cxl_fd_release(inode, file);
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ pr_debug("%s: returning\n", __func__);
+ return 0;
+}
+
+/**
+ * unmap_context() - clears a previously established mapping
+ * @ctx_info: Context owning the mapping.
+ *
+ * This routine is used to switch between the error notification page
+ * (dummy page of all 1's) and the real mapping (established by the CXL
+ * fault handler).
+ */
+static void unmap_context(struct ctx_info *ctx_info)
+{
+ unmap_mapping_range(ctx_info->mapping, 0, 0, 1);
+}
+
+/**
+ * get_err_page() - obtains and allocates the error notification page
+ *
+ * Return: error notification page on success, NULL on failure
+ */
+static struct page *get_err_page(void)
+{
+ struct page *err_page = global.err_page;
+ ulong flags = 0;
+
+ if (unlikely(!err_page)) {
+ err_page = alloc_page(GFP_KERNEL);
+ if (unlikely(!err_page)) {
+ pr_err("%s: Unable to allocate err_page!\n", __func__);
+ goto out;
+ }
+
+ memset(page_address(err_page), -1, PAGE_SIZE);
+
+ /* Serialize update w/ other threads to avoid a leak */
+ spin_lock_irqsave(&global.slock, flags);
+ if (likely(!global.err_page))
+ global.err_page = err_page;
+ else {
+ __free_page(err_page);
+ err_page = global.err_page;
+ }
+ spin_unlock_irqrestore(&global.slock, flags);
+ }
+
+out:
+ pr_debug("%s: returning err_page=%p\n", __func__, err_page);
+ return err_page;
+}
+
+/**
+ * cxlflash_mmap_fault() - mmap fault handler for adapter file descriptor
+ * @vma: VM area associated with mapping.
+ * @vmf: VM fault associated with current fault.
+ *
+ * To support error notification via MMIO, faults are 'caught' by this routine
+ * that was inserted before passing back the adapter file descriptor on attach.
+ * When a fault occurs, this routine evaluates if error recovery is active and
+ * if so, installs the error page to 'notify' the user about the error state.
+ * During normal operation, the fault is simply handled by the original fault
+ * handler that was installed by CXL services as part of initializing the
+ * adapter file descriptor.
+ *
+ * Return: 0 on success, VM_FAULT_SIGBUS on failure
+ */
+static int cxlflash_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct file *file = vma->vm_file;
+ struct cxl_context *ctx = cxl_fops_get_context(file);
+ struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg,
+ cxl_fops);
+ struct ctx_info *ctx_info = NULL;
+ struct page *err_page = NULL;
+ int rc = 0;
+ int ctxid;
+
+ ctxid = cxl_process_element(ctx);
+ if (unlikely(ctxid < 0)) {
+ pr_err("%s: Context %p was closed! (%d)\n",
+ __func__, ctx, ctxid);
+ goto err;
+ }
+
+ ctx_info = get_context(cfg, ctxid, NULL, 0);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Invalid context! (%d)\n", __func__, ctxid);
+ goto err;
+ }
+
+ pr_debug("%s: fault(%d) for context %d\n",
+ __func__, ctx_info->lfd, ctxid);
+
+ if (likely(!ctx_info->err_recovery_active))
+ rc = ctx_info->cxl_mmap_vmops->fault(vma, vmf);
+ else {
+ pr_debug("%s: err recovery active, use err_page!\n", __func__);
+
+ err_page = get_err_page();
+ if (unlikely(!err_page)) {
+ pr_err("%s: Could not obtain error page!\n", __func__);
+ rc = VM_FAULT_RETRY;
+ goto out;
+ }
+
+ get_page(err_page);
+ vmf->page = err_page;
+ }
+
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ pr_debug("%s: returning rc=%d\n", __func__, rc);
+ return rc;
+
+err:
+ rc = VM_FAULT_SIGBUS;
+ goto out;
+}
+
+/*
+ * Local MMAP vmops to 'catch' faults
+ */
+static const struct vm_operations_struct cxlflash_mmap_vmops = {
+ .fault = cxlflash_mmap_fault,
+};
+
+/**
+ * cxlflash_cxl_mmap() - mmap handler for adapter file descriptor
+ * @file: File installed with adapter file descriptor.
+ * @vma: VM area associated with mapping.
+ *
+ * Installs local mmap vmops to 'catch' faults for error notification support.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_cxl_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct cxl_context *ctx = cxl_fops_get_context(file);
+ struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg,
+ cxl_fops);
+ struct ctx_info *ctx_info = NULL;
+ int ctxid;
+ int rc = 0;
+
+ ctxid = cxl_process_element(ctx);
+ if (unlikely(ctxid < 0)) {
+ pr_err("%s: Context %p was closed! (%d)\n",
+ __func__, ctx, ctxid);
+ rc = -EIO;
+ goto out;
+ }
+
+ ctx_info = get_context(cfg, ctxid, NULL, 0);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Invalid context! (%d)\n", __func__, ctxid);
+ rc = -EIO;
+ goto out;
+ }
+
+ pr_debug("%s: mmap(%d) for context %d\n",
+ __func__, ctx_info->lfd, ctxid);
+
+ rc = cxl_fd_mmap(file, vma);
+ if (likely(!rc)) {
+ /*
+ * Insert ourself in the mmap fault handler path and save off
+ * the address space for toggling the mapping on error context.
+ */
+ ctx_info->cxl_mmap_vmops = vma->vm_ops;
+ vma->vm_ops = &cxlflash_mmap_vmops;
+
+ ctx_info->mapping = file->f_inode->i_mapping;
+ }
+
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ return rc;
+}
+
+/*
+ * Local fops for adapter file descriptor
+ */
+static const struct file_operations cxlflash_cxl_fops = {
+ .owner = THIS_MODULE,
+ .mmap = cxlflash_cxl_mmap,
+ .release = cxlflash_cxl_release,
+};
+
+/**
+ * cxlflash_mark_contexts_error() - move contexts to error list and install
+ * error page
+ * @cfg: Internal structure associated with the host.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int cxlflash_mark_contexts_error(struct cxlflash_cfg *cfg)
+{
+ int i, rc = 0;
+ ulong lock_flags;
+ struct ctx_info *ctx_info = NULL;
+
+ spin_lock_irqsave(&cfg->ctx_tbl_slock, lock_flags);
+
+ for (i = 0; i < MAX_CONTEXT; i++) {
+ ctx_info = cfg->ctx_tbl[i];
+
+ if (ctx_info) {
+ cfg->ctx_tbl[i] = NULL;
+ list_add(&ctx_info->list, &cfg->ctx_err_recovery);
+ ctx_info->err_recovery_active = true;
+ unmap_context(ctx_info);
+ }
+ }
+
+ spin_unlock_irqrestore(&cfg->ctx_tbl_slock, lock_flags);
+
+ return rc;
+}
+
+/**
+ * cxlflash_disk_attach() - attach a LUN to a context
+ * @sdev: SCSI device associated with LUN.
+ * @attach: Attach ioctl data structure.
+ *
+ * Creates a context and attaches LUN to it. A LUN can only be attached
+ * one time to a context (subsequent attaches for the same context/LUN pair
+ * are not supported). Additional LUNs can be attached to a context by
+ * specifying the 'reuse' flag defined in the cxlflash_ioctl.h header.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_disk_attach(struct scsi_device *sdev,
+ struct dk_cxlflash_attach *attach)
+{
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct afu *afu = cfg->afu;
+ struct lun_info *lun_info = sdev->hostdata;
+ struct cxl_ioctl_start_work *work;
+ struct ctx_info *ctx_info = NULL;
+ struct lun_access *lun_access = NULL;
+ int rc = 0;
+ u32 perms;
+ int ctxid = -1;
+ struct file *file;
+
+ struct cxl_context *ctx;
+
+ int fd = -1;
+
+ /* On first attach set fileops */
+ if (cfg->num_user_contexts == 0)
+ cfg->cxl_fops = cxlflash_cxl_fops;
+
+ if (attach->num_interrupts > 4) {
+ pr_err("%s: Cannot support this many interrupts %llu\n",
+ __func__, attach->num_interrupts);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (lun_info->max_lba == 0) {
+ pr_debug("%s: No capacity info yet for this LUN "
+ "(%016llX)\n", __func__, lun_info->lun_id);
+ read_cap16(afu, lun_info, sdev->channel + 1);
+ pr_debug("%s: LBA = %016llX\n", __func__, lun_info->max_lba);
+ pr_debug("%s: BLK_LEN = %08X\n", __func__, lun_info->blk_len);
+ }
+
+ if (attach->hdr.flags & DK_CXLFLASH_ATTACH_REUSE_CONTEXT) {
+ ctxid = DECODE_CTXID(attach->context_id);
+ ctx_info = get_context(cfg, ctxid, NULL, 0);
+ if (!ctx_info) {
+ pr_err("%s: Invalid context! (%d)\n", __func__, ctxid);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ list_for_each_entry(lun_access, &ctx_info->luns, list)
+ if (lun_access->lun_info == lun_info) {
+ pr_err("%s: Context already attached!\n",
+ __func__);
+ rc = -EINVAL;
+ goto out;
+ }
+ }
+
+ lun_access = kzalloc(sizeof(*lun_access), GFP_KERNEL);
+ if (unlikely(!lun_access)) {
+ pr_err("%s: Unable to allocate lun_access!\n", __func__);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ lun_access->lun_info = lun_info;
+ lun_access->sdev = sdev;
+
+ /* Non-NULL context indicates reuse */
+ if (ctx_info) {
+ pr_debug("%s: Reusing context for LUN! (%d)\n",
+ __func__, ctxid);
+ list_add(&lun_access->list, &ctx_info->luns);
+ fd = ctx_info->lfd;
+ goto out_attach;
+ }
+
+ ctx = cxl_dev_context_init(cfg->dev);
+ if (!ctx) {
+ pr_err("%s: Could not initialize context\n", __func__);
+ rc = -ENODEV;
+ goto err0;
+ }
+
+ ctxid = cxl_process_element(ctx);
+ if ((ctxid > MAX_CONTEXT) || (ctxid < 0)) {
+ pr_err("%s: ctxid (%d) invalid!\n", __func__, ctxid);
+ rc = -EPERM;
+ goto err1;
+ }
+
+ file = cxl_get_fd(ctx, &cfg->cxl_fops, &fd);
+ if (fd < 0) {
+ rc = -ENODEV;
+ pr_err("%s: Could not get file descriptor\n", __func__);
+ goto err1;
+ }
+
+ /* Translate read/write O_* flags from fcntl.h to AFU permission bits */
+ perms = SISL_RHT_PERM(attach->hdr.flags + 1);
+
+ ctx_info = create_context(cfg, ctx, ctxid, fd, perms);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Failed to create context! (%d)\n", __func__, ctxid);
+ goto err2;
+ }
+
+ work = &ctx_info->work;
+ work->num_interrupts = attach->num_interrupts;
+ work->flags = CXL_START_WORK_NUM_IRQS;
+
+ rc = cxl_start_work(ctx, work);
+ if (rc) {
+ pr_err("%s: Could not start context rc=%d\n", __func__, rc);
+ goto err3;
+ }
+
+ rc = afu_attach(cfg, ctx_info);
+ if (rc) {
+ pr_err("%s: Could not attach AFU rc %d\n", __func__, rc);
+ goto err4;
+ }
+
+ /*
+ * No error paths after this point. Once the fd is installed it's
+ * visible to user space and can't be undone safely on this thread.
+ */
+ list_add(&lun_access->list, &ctx_info->luns);
+ cfg->ctx_tbl[ctxid] = ctx_info;
+ fd_install(fd, file);
+
+out_attach:
+ attach->hdr.return_flags = 0;
+ attach->context_id = ctx_info->ctxid;
+ attach->block_size = lun_info->blk_len;
+ attach->mmio_size = sizeof(afu->afu_map->hosts[0].harea);
+ attach->last_lba = lun_info->max_lba;
+ attach->max_xfer = (sdev->host->max_sectors * 512) / lun_info->blk_len;
+
+out:
+ attach->adap_fd = fd;
+
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+
+ pr_debug("%s: returning ctxid=%d fd=%d bs=%lld rc=%d llba=%lld\n",
+ __func__, ctxid, fd, attach->block_size, rc, attach->last_lba);
+ return rc;
+
+err4:
+ cxl_stop_context(ctx);
+err3:
+ destroy_context(cfg, ctx_info);
+err2:
+ fput(file);
+ put_unused_fd(fd);
+ fd = -1;
+err1:
+ cxl_release_context(ctx);
+err0:
+ kfree(lun_access);
+ goto out;
+}
+
+/**
+ * cxlflash_manage_lun() - handles lun management activities
+ * @sdev: SCSI device associated with LUN.
+ * @manage: Manage ioctl data structure.
+ *
+ * This routine is used to notify the driver about a LUN's WWID and associate
+ * SCSI devices (sdev) with a global LUN instance. Additionally it serves to
+ * change a LUN's operating mode: legacy or superpipe.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_manage_lun(struct scsi_device *sdev,
+ struct dk_cxlflash_manage_lun *manage)
+{
+ struct lun_info *lun_info = NULL;
+
+ lun_info = lookup_lun(sdev, manage->wwid);
+ pr_debug("%s: ENTER: WWID = %016llX%016llX, flags = %016llX li = %p\n",
+ __func__, get_unaligned_le64(&manage->wwid[0]),
+ get_unaligned_le64(&manage->wwid[8]),
+ manage->hdr.flags, lun_info);
+ return 0;
+}
+
+/**
+ * recover_context() - recovers a context in error
+ * @cfg: Internal structure associated with the host.
+ * @ctx_info: Context to release.
+ *
+ * Restablishes the state for a context-in-error.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int recover_context(struct cxlflash_cfg *cfg, struct ctx_info *ctx_info)
+{
+ int rc = 0;
+ int fd = -1;
+ int ctxid = -1;
+ struct file *file;
+ struct cxl_context *ctx;
+ struct afu *afu = cfg->afu;
+
+ ctx = cxl_dev_context_init(cfg->dev);
+ if (!ctx) {
+ pr_err("%s: Could not initialize context\n", __func__);
+ rc = -ENODEV;
+ goto out;
+ }
+
+ ctxid = cxl_process_element(ctx);
+ if ((ctxid > MAX_CONTEXT) || (ctxid < 0)) {
+ pr_err("%s: ctxid (%d) invalid!\n", __func__, ctxid);
+ rc = -EPERM;
+ goto err1;
+ }
+
+ file = cxl_get_fd(ctx, &cfg->cxl_fops, &fd);
+ if (fd < 0) {
+ rc = -ENODEV;
+ pr_err("%s: Could not get file descriptor\n", __func__);
+ goto err1;
+ }
+
+ rc = cxl_start_work(ctx, &ctx_info->work);
+ if (rc) {
+ pr_err("%s: Could not start context rc=%d\n", __func__, rc);
+ goto err2;
+ }
+
+ /* Update with new MMIO area based on updated context id */
+ ctx_info->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl;
+
+ rc = afu_attach(cfg, ctx_info);
+ if (rc) {
+ pr_err("%s: Could not attach AFU rc %d\n", __func__, rc);
+ goto err3;
+ }
+
+ /*
+ * No error paths after this point. Once the fd is installed it's
+ * visible to user space and can't be undone safely on this thread.
+ */
+ ctx_info->ctxid = ENCODE_CTXID(ctx_info, ctxid);
+ ctx_info->lfd = fd;
+ ctx_info->ctx = ctx;
+
+ cfg->ctx_tbl[ctxid] = ctx_info;
+ fd_install(fd, file);
+
+out:
+ pr_debug("%s: returning ctxid=%d fd=%d rc=%d\n",
+ __func__, ctxid, fd, rc);
+ return rc;
+
+err3:
+ cxl_stop_context(ctx);
+err2:
+ fput(file);
+ put_unused_fd(fd);
+err1:
+ cxl_release_context(ctx);
+ goto out;
+}
+
+/**
+ * cxlflash_afu_recover() - initiates AFU recovery
+ * @sdev: SCSI device associated with LUN.
+ * @recover: Recover ioctl data structure.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_afu_recover(struct scsi_device *sdev,
+ struct dk_cxlflash_recover_afu *recover)
+{
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct lun_info *lun_info = sdev->hostdata;
+ struct afu *afu = cfg->afu;
+ struct ctx_info *ctx_info = NULL;
+ u64 ctxid = DECODE_CTXID(recover->context_id);
+ long reg;
+ int rc = 0;
+
+ /* Ensure that this process is attached to the context */
+ ctx_info = get_context(cfg, ctxid, lun_info, 0);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Invalid context! (%llu)\n", __func__, ctxid);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = recover_context(cfg, ctx_info);
+ if (unlikely(rc)) {
+ pr_err("%s: Error recovery failed for context %llu (rc=%d)\n",
+ __func__, ctxid, rc);
+ goto out;
+ }
+
+ ctx_info->err_recovery_active = false;
+ recover->context_id = ctx_info->ctxid;
+ recover->adap_fd = ctx_info->lfd;
+ recover->mmio_size = sizeof(afu->afu_map->hosts[0].harea);
+
+ reg = readq_be(&afu->ctrl_map->mbox_r); /* Try MMIO */
+ /* MMIO returning 0xff, need to reset */
+ if (reg == -1) {
+ pr_info("%s: afu=%p reason 0x%llx\n",
+ __func__, afu, recover->reason);
+ cxlflash_afu_reset(cfg);
+ } else {
+ pr_debug("%s: reason 0x%llx MMIO working, no reset performed\n",
+ __func__, recover->reason);
+ rc = -EINVAL;
+ }
+
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ return rc;
+}
+
+/**
+ * process_sense() - evaluates and processes sense data
+ * @sdev: SCSI device associated with LUN.
+ * @verify: Verify ioctl data structure.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int process_sense(struct scsi_device *sdev,
+ struct dk_cxlflash_verify *verify)
+{
+ struct request_sense_data *sense_data = (struct request_sense_data *)
+ &verify->sense_data;
+ struct lun_info *lun_info = sdev->hostdata;
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct afu *afu = cfg->afu;
+ u64 prev_lba = lun_info->max_lba;
+ int rc = 0;
+
+ switch (sense_data->sense_key) {
+ case NO_SENSE:
+ case RECOVERED_ERROR:
+ /* fall through */
+ case NOT_READY:
+ break;
+ case UNIT_ATTENTION:
+ switch (sense_data->add_sense_key) {
+ case 0x29: /* Power on Reset or Device Reset */
+ /* fall through */
+ case 0x2A: /* Device settings/capacity changed */
+ read_cap16(afu, lun_info, sdev->channel + 1);
+ if (prev_lba != lun_info->max_lba)
+ pr_debug("%s: Capacity changed old=%lld "
+ "new=%lld\n", __func__, prev_lba,
+ lun_info->max_lba);
+ break;
+ case 0x3F: /* Report LUNs changed, Rescan. */
+ scsi_scan_host(cfg->host);
+ break;
+ default:
+ rc = -EIO;
+ break;
+ }
+ break;
+ default:
+ rc = -EIO;
+ break;
+ }
+ pr_debug("%s: sense_key %x asc %x rc %d\n", __func__,
+ sense_data->sense_key, sense_data->add_sense_key, rc);
+ return rc;
+}
+
+/**
+ * cxlflash_disk_verify() - verifies a LUN is the same and handle size changes
+ * @sdev: SCSI device associated with LUN.
+ * @verify: Verify ioctl data structure.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_disk_verify(struct scsi_device *sdev,
+ struct dk_cxlflash_verify *verify)
+{
+ int rc = 0;
+ struct ctx_info *ctx_info = NULL;
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct lun_info *lun_info = sdev->hostdata;
+ struct sisl_rht_entry *rht_entry = NULL;
+ res_hndl_t res_hndl = verify->rsrc_handle;
+ u64 ctxid = DECODE_CTXID(verify->context_id);
+ u64 last_lba = 0;
+
+ pr_debug("%s: ctxid=%llu res_hndl=0x%llx, hint=0x%llx\n",
+ __func__, ctxid, verify->rsrc_handle, verify->hint);
+
+ ctx_info = get_context(cfg, ctxid, lun_info, 0);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Invalid context! (%llu)\n",
+ __func__, ctxid);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rht_entry = get_rhte(ctx_info, res_hndl, lun_info);
+ if (unlikely(!rht_entry)) {
+ pr_err("%s: Invalid resource handle! (%d)\n",
+ __func__, res_hndl);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * Look at the hint/sense to see if it requires us to redrive
+ * inquiry (i.e. the Unit attention is due to the WWN changing).
+ */
+ if (verify->hint & DK_CXLFLASH_VERIFY_HINT_SENSE) {
+ rc = process_sense(sdev, verify);
+ if (unlikely(rc)) {
+ pr_err("%s: Failed to validate sense data! (%d)\n",
+ __func__, rc);
+ goto out;
+ }
+ }
+
+ switch (lun_info->mode) {
+ case MODE_PHYSICAL:
+ last_lba = lun_info->max_lba;
+ break;
+ case MODE_VIRTUAL:
+ last_lba = (((rht_entry->lxt_cnt * MC_CHUNK_SIZE *
+ lun_info->blk_len) / CXLFLASH_BLOCK_SIZE) - 1);
+ break;
+ default:
+ BUG();
+ }
+
+ verify->last_lba = last_lba;
+
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ pr_debug("%s: returning rc=%d llba=%lld\n",
+ __func__, rc, verify->last_lba);
+ return rc;
+}
+
+/**
+ * decode_ioctl() - translates an encoded ioctl to an easily identifiable string
+ * @cmd: The ioctl command to decode.
+ *
+ * Return: A string identifying the decoded ioctl.
+ */
+static char *decode_ioctl(int cmd)
+{
+ switch (cmd) {
+ case DK_CXLFLASH_ATTACH:
+ return __stringify_1(DK_CXLFLASH_ATTACH);
+ case DK_CXLFLASH_USER_DIRECT:
+ return __stringify_1(DK_CXLFLASH_USER_DIRECT);
+ case DK_CXLFLASH_USER_VIRTUAL:
+ return __stringify_1(DK_CXLFLASH_USER_VIRTUAL);
+ case DK_CXLFLASH_VLUN_RESIZE:
+ return __stringify_1(DK_CXLFLASH_VLUN_RESIZE);
+ case DK_CXLFLASH_RELEASE:
+ return __stringify_1(DK_CXLFLASH_RELEASE);
+ case DK_CXLFLASH_DETACH:
+ return __stringify_1(DK_CXLFLASH_DETACH);
+ case DK_CXLFLASH_VERIFY:
+ return __stringify_1(DK_CXLFLASH_VERIFY);
+ case DK_CXLFLASH_CLONE:
+ return __stringify_1(DK_CXLFLASH_CLONE);
+ case DK_CXLFLASH_RECOVER_AFU:
+ return __stringify_1(DK_CXLFLASH_RECOVER_AFU);
+ case DK_CXLFLASH_MANAGE_LUN:
+ return __stringify_1(DK_CXLFLASH_MANAGE_LUN);
+ }
+
+ return "UNKNOWN";
+}
+
+/**
+ * cxlflash_disk_direct_open() - opens a direct (physical) disk
+ * @sdev: SCSI device associated with LUN.
+ * @arg: UDirect ioctl data structure.
+ *
+ * On successful return, the user is informed of the resource handle
+ * to be used to identify the direct lun and the size (in blocks) of
+ * the direct lun in last LBA format.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_disk_direct_open(struct scsi_device *sdev, void *arg)
+{
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct afu *afu = cfg->afu;
+ struct lun_info *lun_info = sdev->hostdata;
+
+ struct dk_cxlflash_udirect *pphys = (struct dk_cxlflash_udirect *)arg;
+
+ u64 ctxid = DECODE_CTXID(pphys->context_id);
+ u64 lun_size = 0;
+ u64 last_lba = 0;
+ u64 rsrc_handle = -1;
+
+ int rc = 0;
+
+ struct ctx_info *ctx_info = NULL;
+ struct sisl_rht_entry *rht_entry = NULL;
+
+ pr_debug("%s: ctxid=%llu ls=0x%llx\n", __func__, ctxid, lun_size);
+
+ rc = cxlflash_lun_attach(lun_info, MODE_PHYSICAL);
+ if (unlikely(rc)) {
+ pr_err("%s: Failed to attach to LUN! mode=%u\n",
+ __func__, MODE_PHYSICAL);
+ goto out;
+ }
+
+ ctx_info = get_context(cfg, ctxid, lun_info, 0);
+ if (unlikely(!ctx_info)) {
+ pr_err("%s: Invalid context! (%llu)\n", __func__, ctxid);
+ rc = -EINVAL;
+ goto err1;
+ }
+
+ rht_entry = rhte_checkout(ctx_info, lun_info);
+ if (unlikely(!rht_entry)) {
+ pr_err("%s: too many opens for this context\n", __func__);
+ rc = -EMFILE; /* too many opens */
+ goto err1;
+ }
+
+ rsrc_handle = (rht_entry - ctx_info->rht_start);
+
+ rht_format1(rht_entry, lun_info->lun_id, ctx_info->rht_perms);
+ cxlflash_afu_sync(afu, ctxid, rsrc_handle, AFU_LW_SYNC);
+
+ last_lba = lun_info->max_lba;
+ pphys->hdr.return_flags = 0;
+ pphys->last_lba = last_lba;
+ pphys->rsrc_handle = rsrc_handle;
+
+out:
+ if (likely(ctx_info))
+ atomic_dec(&ctx_info->nrefs);
+ pr_debug("%s: returning handle 0x%llx rc=%d llba %lld\n",
+ __func__, rsrc_handle, rc, last_lba);
+ return rc;
+
+err1:
+ cxlflash_lun_detach(lun_info);
+ goto out;
+}
+
+/**
+ * cxlflash_ioctl() - IOCTL handler for driver
+ * @sdev: SCSI device associated with LUN.
+ * @arg: Userspace ioctl data structure.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int cxlflash_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
+{
+ typedef int (*sioctl) (struct scsi_device *, void *);
+
+ struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata;
+ struct afu *afu = cfg->afu;
+ struct dk_cxlflash_hdr *hdr;
+ char buf[MAX_CXLFLASH_IOCTL_SZ];
+ size_t size = 0;
+ bool known_ioctl = false;
+ int idx;
+ int rc = 0;
+ struct Scsi_Host *shost = sdev->host;
+ sioctl do_ioctl = NULL;
+
+ static const struct {
+ size_t size;
+ sioctl ioctl;
+ } ioctl_tbl[] = { /* NOTE: order matters here */
+ {sizeof(struct dk_cxlflash_attach), (sioctl)cxlflash_disk_attach},
+ {sizeof(struct dk_cxlflash_udirect), cxlflash_disk_direct_open},
+ {sizeof(struct dk_cxlflash_release), (sioctl)cxlflash_disk_release},
+ {sizeof(struct dk_cxlflash_detach), (sioctl)cxlflash_disk_detach},
+ {sizeof(struct dk_cxlflash_verify), (sioctl)cxlflash_disk_verify},
+ {sizeof(struct dk_cxlflash_recover_afu), (sioctl)cxlflash_afu_recover},
+ {sizeof(struct dk_cxlflash_manage_lun), (sioctl)cxlflash_manage_lun},
+ };
+
+ /* Restrict command set to physical support only for internal LUN */
+ if (afu->internal_lun)
+ switch (cmd) {
+ case DK_CXLFLASH_USER_VIRTUAL:
+ case DK_CXLFLASH_VLUN_RESIZE:
+ case DK_CXLFLASH_RELEASE:
+ case DK_CXLFLASH_CLONE:
+ pr_err("%s: %s not supported for lun_mode=%d\n",
+ __func__, decode_ioctl(cmd), afu->internal_lun);
+ rc = -EINVAL;
+ goto cxlflash_ioctl_exit;
+ }
+
+ switch (cmd) {
+ case DK_CXLFLASH_ATTACH:
+ case DK_CXLFLASH_USER_DIRECT:
+ case DK_CXLFLASH_USER_VIRTUAL:
+ case DK_CXLFLASH_VLUN_RESIZE:
+ case DK_CXLFLASH_RELEASE:
+ case DK_CXLFLASH_DETACH:
+ case DK_CXLFLASH_VERIFY:
+ case DK_CXLFLASH_CLONE:
+ case DK_CXLFLASH_RECOVER_AFU:
+ case DK_CXLFLASH_MANAGE_LUN:
+ known_ioctl = true;
+ idx = _IOC_NR(cmd) - _IOC_NR(DK_CXLFLASH_ATTACH);
+ size = ioctl_tbl[idx].size;
+ do_ioctl = ioctl_tbl[idx].ioctl;
+
+ if (likely(do_ioctl))
+ break;
+
+ /* fall through */
+ default:
+ rc = -EINVAL;
+ goto cxlflash_ioctl_exit;
+ }
+
+ if (unlikely(copy_from_user(&buf, arg, size))) {
+ pr_err("%s: copy_from_user() fail! "
+ "size=%lu cmd=%d (%s) arg=%p\n",
+ __func__, size, cmd, decode_ioctl(cmd), arg);
+ rc = -EFAULT;
+ goto cxlflash_ioctl_exit;
+ }
+
+ hdr = (struct dk_cxlflash_hdr *)&buf;
+ if (hdr->version != 0) {
+ pr_err("%s: Version %u not supported for %s\n",
+ __func__, hdr->version, decode_ioctl(cmd));
+ rc = -EINVAL;
+ goto cxlflash_ioctl_exit;
+ }
+
+ rc = do_ioctl(sdev, (void *)&buf);
+ if (likely(!rc))
+ if (unlikely(copy_to_user(arg, &buf, size))) {
+ pr_err("%s: copy_to_user() fail! "
+ "size=%lu cmd=%d (%s) arg=%p\n",
+ __func__, size, cmd, decode_ioctl(cmd), arg);
+ rc = -EFAULT;
+ }
+
+ /* fall through to exit */
+
+cxlflash_ioctl_exit:
+ if (unlikely(rc && known_ioctl))
+ pr_err("%s: ioctl %s (%08X) on dev(%d/%d/%d/%llu) "
+ "returned rc %d\n", __func__,
+ decode_ioctl(cmd), cmd, shost->host_no,
+ sdev->channel, sdev->id, sdev->lun, rc);
+ else
+ pr_debug("%s: ioctl %s (%08X) on dev(%d/%d/%d/%llu) "
+ "returned rc %d\n", __func__, decode_ioctl(cmd),
+ cmd, shost->host_no, sdev->channel, sdev->id,
+ sdev->lun, rc);
+ return rc;
+}
+
diff --git a/drivers/scsi/cxlflash/superpipe.h b/drivers/scsi/cxlflash/superpipe.h
new file mode 100644
index 0000000..1bf9f60
--- /dev/null
+++ b/drivers/scsi/cxlflash/superpipe.h
@@ -0,0 +1,210 @@
+/*
+ * CXL Flash Device Driver
+ *
+ * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
+ * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) 2015 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _CXLFLASH_SUPERPIPE_H
+#define _CXLFLASH_SUPERPIPE_H
+
+extern struct cxlflash_global global;
+
+/*----------------------------------------------------------------------------*/
+/* Constants */
+/*----------------------------------------------------------------------------*/
+
+#define SL_INI_SINI_MARKER 0x53494e49
+#define SL_INI_ELMD_MARKER 0x454c4d44
+/*----------------------------------------------------------------------------*/
+/* Types */
+/*----------------------------------------------------------------------------*/
+
+#define MAX_AUN_CLONE_CNT 0xFF
+
+/*
+ * Terminology: use afu (and not adapter) to refer to the HW.
+ * Adapter is the entire slot and includes PSL out of which
+ * only the AFU is visible to user space.
+ */
+
+/* Chunk size parms: note sislite minimum chunk size is
+ 0x10000 LBAs corresponding to a NMASK or 16.
+*/
+#define MC_RHT_NMASK 16 /* in bits */
+#define MC_CHUNK_SIZE (1 << MC_RHT_NMASK) /* in LBAs, see mclient.h */
+#define MC_CHUNK_SHIFT MC_RHT_NMASK /* shift to go from LBA to chunk# */
+#define LXT_LUNIDX_SHIFT 8 /* LXT entry, shift for LUN index */
+#define LXT_PERM_SHIFT 4 /* LXT entry, shift for permission bits */
+
+/* LXT tables are allocated dynamically in groups. This is done to
+ avoid a malloc/free overhead each time the LXT has to grow
+ or shrink.
+
+ Based on the current lxt_cnt (used), it is always possible to
+ know how many are allocated (used+free). The number of allocated
+ entries is not stored anywhere.
+
+ The LXT table is re-allocated whenever it needs to cross into
+ another group.
+*/
+#define LXT_GROUP_SIZE 8
+#define LXT_NUM_GROUPS(lxt_cnt) (((lxt_cnt) + 7)/8) /* alloc'ed groups */
+
+#define MC_DISCOVERY_TIMEOUT 5 /* 5 secs */
+
+enum lun_mode {
+ MODE_NONE = 0,
+ MODE_VIRTUAL,
+ MODE_PHYSICAL
+};
+
+/* SCSI Defines */
+
+struct request_sense_data {
+ uint8_t err_code; /* error class and code */
+ uint8_t rsvd0;
+ uint8_t sense_key;
+#define CXLFLASH_VENDOR_UNIQUE 0x09
+#define CXLFLASH_EQUAL_CMD 0x0C
+ uint8_t sense_byte0;
+ uint8_t sense_byte1;
+ uint8_t sense_byte2;
+ uint8_t sense_byte3;
+ uint8_t add_sense_length;
+ uint8_t add_sense_byte0;
+ uint8_t add_sense_byte1;
+ uint8_t add_sense_byte2;
+ uint8_t add_sense_byte3;
+ uint8_t add_sense_key;
+ uint8_t add_sense_qualifier;
+ uint8_t fru;
+ uint8_t flag_byte;
+ uint8_t field_ptrM;
+ uint8_t field_ptrL;
+};
+
+struct ba_lun {
+ u64 lun_id;
+ u64 wwpn;
+ size_t lsize; /* LUN size in number of LBAs */
+ size_t lba_size; /* LBA size in number of bytes */
+ size_t au_size; /* Allocation Unit size in number of LBAs */
+ void *ba_lun_handle;
+};
+
+struct ba_lun_info {
+ u64 *lun_alloc_map;
+ u32 lun_bmap_size;
+ u32 total_aus;
+ u64 free_aun_cnt;
+
+ /* indices to be used for elevator lookup of free map */
+ u32 free_low_idx;
+ u32 free_curr_idx;
+ u32 free_high_idx;
+
+ u8 *aun_clone_map;
+};
+
+/* Block Allocator */
+struct blka {
+ struct ba_lun ba_lun;
+ u64 nchunk; /* number of chunks */
+ struct mutex mutex;
+};
+
+/* LUN discovery results are in lun_info */
+struct lun_info {
+ u64 lun_id; /* from REPORT_LUNS */
+ u64 max_lba; /* from read cap(16) */
+ u32 blk_len; /* from read cap(16) */
+ u32 lun_index;
+ int users; /* Number of users w/ references to LUN */
+ enum lun_mode mode; /* NONE, VIRTUAL, PHYSICAL */
+
+ __u8 wwid[16];
+
+ spinlock_t slock;
+
+ struct blka blka;
+ struct scsi_device *sdev;
+ struct list_head list;
+};
+
+struct lun_access {
+ struct lun_info *lun_info;
+ struct scsi_device *sdev;
+ struct list_head list;
+};
+
+enum ctx_ctrl {
+ CTX_CTRL_CLONE = (1 << 1),
+ CTX_CTRL_ERR = (1 << 2),
+ CTX_CTRL_ERR_FALLBACK = (1 << 3),
+ CTX_CTRL_NOPID = (1 << 4)
+};
+
+#define ENCODE_CTXID(_ctx, _id) (((((u64)_ctx) & 0xFFFFFFFF0) << 28) | _id)
+#define DECODE_CTXID(_val) (_val & 0xFFFFFFFF)
+
+struct ctx_info {
+ struct sisl_ctrl_map *ctrl_map; /* initialized at startup */
+ struct sisl_rht_entry *rht_start; /* 1 page (req'd for alignment),
+ alloc/free on attach/detach */
+ u32 rht_out; /* Number of checked out RHT entries */
+ u32 rht_perms; /* User-defined permissions for RHT entries */
+ struct lun_info **rht_lun; /* Mapping of RHT entries to LUNs */
+
+ struct cxl_ioctl_start_work work;
+ u64 ctxid;
+ int lfd;
+ pid_t pid;
+ atomic_t nrefs; /* Number of active references, must be 0 for removal */
+ bool err_recovery_active;
+ struct cxl_context *ctx;
+ struct list_head luns; /* LUNs attached to this context */
+ const struct vm_operations_struct *cxl_mmap_vmops;
+ struct address_space *mapping;
+ struct list_head list; /* Link contexts in error recovery */
+};
+
+struct cxlflash_global {
+ spinlock_t slock;
+ struct list_head luns; /* list of lun_info structs */
+ struct page *err_page; /* One page of all 0xF for error notification */
+};
+
+
+int cxlflash_vlun_resize(struct scsi_device *, struct dk_cxlflash_resize *);
+
+int cxlflash_disk_release(struct scsi_device *, struct dk_cxlflash_release *);
+
+int cxlflash_disk_clone(struct scsi_device *, struct dk_cxlflash_clone *);
+
+int cxlflash_disk_virtual_open(struct scsi_device *, void *);
+
+int cxlflash_lun_attach(struct lun_info *, enum lun_mode);
+void cxlflash_lun_detach(struct lun_info *);
+
+int cxlflash_check_status(struct afu_cmd *);
+
+struct ctx_info *get_context(struct cxlflash_cfg *, u64, struct lun_info *,
+ enum ctx_ctrl);
+
+struct sisl_rht_entry *get_rhte(struct ctx_info *, res_hndl_t,
+ struct lun_info *);
+
+struct sisl_rht_entry *rhte_checkout(struct ctx_info *, struct lun_info *);
+void rhte_checkin(struct ctx_info *, struct sisl_rht_entry *);
+
+void cxlflash_ba_terminate(struct ba_lun *);
+
+#endif /* ifndef _CXLFLASH_SUPERPIPE_H */
diff --git a/include/uapi/scsi/cxlflash_ioctl.h b/include/uapi/scsi/cxlflash_ioctl.h
new file mode 100644
index 0000000..dd1f954
--- /dev/null
+++ b/include/uapi/scsi/cxlflash_ioctl.h
@@ -0,0 +1,159 @@
+/*
+ * CXL Flash Device Driver
+ *
+ * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
+ * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) 2015 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _CXLFLASH_IOCTL_H
+#define _CXLFLASH_IOCTL_H
+
+#include <linux/types.h>
+
+/*
+ * Structure and flag definitions CXL Flash superpipe ioctls
+ */
+
+struct dk_cxlflash_hdr {
+ __u16 version; /* Version data */
+ __u16 rsvd[3]; /* Reserved for future use */
+ __u64 flags; /* Input flags */
+ __u64 return_flags; /* Returned flags */
+};
+
+/*
+ * Notes:
+ * -----
+ * The 'context_id' field of all ioctl structures contains the context
+ * identifier for a context in the lower 32-bits (upper 32-bits are not
+ * to be used when identifying a context to the AFU). That said, the value
+ * in its entirety (all 64-bits) is to be treated as an opaque cookie and
+ * should be presented as such when issuing ioctls.
+ *
+ * For DK_CXLFLASH_ATTACH ioctl, user specifies read/write access
+ * permissions via the O_RDONLY, O_WRONLY, and O_RDWR flags defined in
+ * the fcntl.h header file.
+ */
+#define DK_CXLFLASH_ATTACH_REUSE_CONTEXT 0x8000000000000000ULL
+
+struct dk_cxlflash_attach {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 num_interrupts; /* Requested number of interrupts */
+ __u64 context_id; /* Returned context */
+ __u64 mmio_size; /* Returned size of MMIO area */
+ __u64 block_size; /* Returned block size, in bytes */
+ __u64 adap_fd; /* Returned adapter file descriptor */
+ __u64 last_lba; /* Returned last LBA on the device */
+ __u64 max_xfer; /* Returned max transfer size, blocks */
+};
+
+struct dk_cxlflash_detach {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context to detach */
+};
+
+struct dk_cxlflash_udirect {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context to own physical resources */
+ __u64 rsrc_handle; /* Returned resource handle */
+ __u64 last_lba; /* Returned last LBA on the device */
+};
+
+struct dk_cxlflash_uvirtual {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context to own virtual resources */
+ __u64 lun_size; /* Requested size, in 4K blocks */
+ __u64 rsrc_handle; /* Returned resource handle */
+ __u64 last_lba; /* Returned last LBA of LUN */
+};
+
+struct dk_cxlflash_release {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context owning resources */
+ __u64 rsrc_handle; /* Resource handle to release */
+};
+
+struct dk_cxlflash_resize {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context owning resources */
+ __u64 rsrc_handle; /* Resource handle of LUN to resize */
+ __u64 req_size; /* New requested size, in 4K blocks */
+ __u64 last_lba; /* Returned last LBA of LUN */
+};
+
+struct dk_cxlflash_clone {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id_src; /* Context to clone from */
+ __u64 context_id_dst; /* Context to clone to */
+ __u64 adap_fd_src; /* Source context adapter fd */
+};
+
+#define DK_CXLFLASH_VERIFY_SENSE_LEN 18
+#define DK_CXLFLASH_VERIFY_HINT_SENSE 0x8000000000000000ULL
+
+struct dk_cxlflash_verify {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context owning resources to verify */
+ __u64 rsrc_handle; /* Resource handle of LUN */
+ __u64 hint; /* Reasons for verify */
+ __u64 last_lba; /* Returned last LBA of device */
+ __u8 sense_data[DK_CXLFLASH_VERIFY_SENSE_LEN]; /* SCSI sense data */
+ __u8 pad[6]; /* Pad to next 8-byte boundary */
+};
+
+struct dk_cxlflash_recover_afu {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 reason; /* Reason for recovery request */
+ __u64 context_id; /* Context to recover / updated ID */
+ __u64 mmio_size; /* Returned size of MMIO area */
+ __u64 adap_fd; /* Returned adapter file descriptor */
+};
+
+#define DK_CXLFLASH_MANAGE_LUN_WWID_LEN 16
+#define DK_CXLFLASH_MANAGE_LUN_ENABLE_SUPERPIPE 0x8000000000000000ULL
+#define DK_CXLFLASH_MANAGE_LUN_DISABLE_SUPERPIPE 0x4000000000000000ULL
+#define DK_CXLFLASH_MANAGE_LUN_ALL_PORTS_ACCESSIBLE 0x2000000000000000ULL
+
+struct dk_cxlflash_manage_lun {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u8 wwid[DK_CXLFLASH_MANAGE_LUN_WWID_LEN]; /* Page83 WWID, NAA-6 */
+};
+
+union cxlflash_ioctls {
+ struct dk_cxlflash_attach attach;
+ struct dk_cxlflash_detach detach;
+ struct dk_cxlflash_udirect udirect;
+ struct dk_cxlflash_uvirtual uvirtual;
+ struct dk_cxlflash_release release;
+ struct dk_cxlflash_resize resize;
+ struct dk_cxlflash_clone clone;
+ struct dk_cxlflash_verify verify;
+ struct dk_cxlflash_recover_afu recover_afu;
+ struct dk_cxlflash_manage_lun manage_lun;
+};
+
+#define MAX_CXLFLASH_IOCTL_SZ (sizeof(union cxlflash_ioctls))
+
+
+#define CXL_MAGIC 0xCA
+#define CXL_IOW(_n, _s) _IOW(CXL_MAGIC, _n, struct _s)
+
+#define DK_CXLFLASH_ATTACH CXL_IOW(0x80, dk_cxlflash_attach)
+#define DK_CXLFLASH_USER_DIRECT CXL_IOW(0x81, dk_cxlflash_udirect)
+#define DK_CXLFLASH_USER_VIRTUAL CXL_IOW(0x82, dk_cxlflash_uvirtual)
+#define DK_CXLFLASH_VLUN_RESIZE CXL_IOW(0x83, dk_cxlflash_resize)
+#define DK_CXLFLASH_RELEASE CXL_IOW(0x84, dk_cxlflash_release)
+#define DK_CXLFLASH_DETACH CXL_IOW(0x85, dk_cxlflash_detach)
+#define DK_CXLFLASH_VERIFY CXL_IOW(0x86, dk_cxlflash_verify)
+#define DK_CXLFLASH_CLONE CXL_IOW(0x87, dk_cxlflash_clone)
+#define DK_CXLFLASH_RECOVER_AFU CXL_IOW(0x88, dk_cxlflash_recover_afu)
+#define DK_CXLFLASH_MANAGE_LUN CXL_IOW(0x89, dk_cxlflash_manage_lun)
+
+#endif /* ifndef _CXLFLASH_IOCTL_H */
--
2.1.0
--
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next reply other threads:[~2015-06-19 22:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-19 22:37 Matthew R. Ochs [this message]
2015-07-02 6:39 ` [PATCH 1/2] cxlflash: Base superpipe support Michael Neuling
2015-07-02 16:57 ` Matthew R. Ochs
2015-07-02 7:00 ` Michael Neuling
2015-07-03 3:47 ` Michael Neuling
2015-07-10 19:49 ` Brian King
2015-07-11 23:36 ` Matthew R. Ochs
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