cregit-Linux how code gets into the kernel

Release 4.11 drivers/scsi/cxlflash/lunmgt.c

/*
 * 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 <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 "vlun.h"
#include "superpipe.h"

/**
 * create_local() - allocate and initialize a local LUN information structure
 * @sdev:       SCSI device associated with LUN.
 * @wwid:       World Wide Node Name for LUN.
 *
 * Return: Allocated local llun_info structure on success, NULL on failure
 */

static struct llun_info *create_local(struct scsi_device *sdev, u8 *wwid) { struct cxlflash_cfg *cfg = shost_priv(sdev->host); struct device *dev = &cfg->dev->dev; struct llun_info *lli = NULL; lli = kzalloc(sizeof(*lli), GFP_KERNEL); if (unlikely(!lli)) { dev_err(dev, "%s: could not allocate lli\n", __func__); goto out; } lli->sdev = sdev; lli->host_no = sdev->host->host_no; lli->in_table = false; memcpy(lli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN); out: return lli; }

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Matthew R. Ochs121100.00%3100.00%
Total121100.00%3100.00%

/** * create_global() - allocate and initialize a global LUN information structure * @sdev: SCSI device associated with LUN. * @wwid: World Wide Node Name for LUN. * * Return: Allocated global glun_info structure on success, NULL on failure */
static struct glun_info *create_global(struct scsi_device *sdev, u8 *wwid) { struct cxlflash_cfg *cfg = shost_priv(sdev->host); struct device *dev = &cfg->dev->dev; struct glun_info *gli = NULL; gli = kzalloc(sizeof(*gli), GFP_KERNEL); if (unlikely(!gli)) { dev_err(dev, "%s: could not allocate gli\n", __func__); goto out; } mutex_init(&gli->mutex); memcpy(gli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN); out: return gli; }

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Matthew R. Ochs107100.00%2100.00%
Total107100.00%2100.00%

/** * lookup_local() - find a local LUN information structure by WWID * @cfg: Internal structure associated with the host. * @wwid: WWID associated with LUN. * * Return: Found local lun_info structure on success, NULL on failure */
static struct llun_info *lookup_local(struct cxlflash_cfg *cfg, u8 *wwid) { struct llun_info *lli, *temp; list_for_each_entry_safe(lli, temp, &cfg->lluns, list) if (!memcmp(lli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN)) return lli; return NULL; }

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Matthew R. Ochs55100.00%2100.00%
Total55100.00%2100.00%

/** * lookup_global() - find a global LUN information structure by WWID * @wwid: WWID associated with LUN. * * Return: Found global lun_info structure on success, NULL on failure */
static struct glun_info *lookup_global(u8 *wwid) { struct glun_info *gli, *temp; list_for_each_entry_safe(gli, temp, &global.gluns, list) if (!memcmp(gli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN)) return gli; return NULL; }

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Matthew R. Ochs50100.00%1100.00%
Total50100.00%1100.00%

/** * find_and_create_lun() - find or create a local LUN information structure * @sdev: SCSI device associated with LUN. * @wwid: WWID associated with LUN. * * The LUN is kept both in a local list (per adapter) and in a global list * (across all adapters). Certain attributes of the LUN are local to the * adapter (such as index, port selection mask, etc.). * * The block allocation map is shared across all adapters (i.e. associated * wih the global list). Since different attributes are associated with * the per adapter and global entries, allocate two separate structures for each * LUN (one local, one global). * * Keep a pointer back from the local to the global entry. * * This routine assumes the caller holds the global mutex. * * Return: Found/Allocated local lun_info structure on success, NULL on failure */
static struct llun_info *find_and_create_lun(struct scsi_device *sdev, u8 *wwid) { struct cxlflash_cfg *cfg = shost_priv(sdev->host); struct device *dev = &cfg->dev->dev; struct llun_info *lli = NULL; struct glun_info *gli = NULL; if (unlikely(!wwid)) goto out; lli = lookup_local(cfg, wwid); if (lli) goto out; lli = create_local(sdev, wwid); if (unlikely(!lli)) goto out; gli = lookup_global(wwid); if (gli) { lli->parent = gli; list_add(&lli->list, &cfg->lluns); goto out; } gli = create_global(sdev, wwid); if (unlikely(!gli)) { kfree(lli); lli = NULL; goto out; } lli->parent = gli; list_add(&lli->list, &cfg->lluns); list_add(&gli->list, &global.gluns); out: dev_dbg(dev, "%s: returning lli=%p, gli=%p\n", __func__, lli, gli); return lli; }

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Matthew R. Ochs218100.00%3100.00%
Total218100.00%3100.00%

/** * cxlflash_term_local_luns() - Delete all entries from local LUN list, free. * @cfg: Internal structure associated with the host. */
void cxlflash_term_local_luns(struct cxlflash_cfg *cfg) { struct llun_info *lli, *temp; mutex_lock(&global.mutex); list_for_each_entry_safe(lli, temp, &cfg->lluns, list) { list_del(&lli->list); kfree(lli); } mutex_unlock(&global.mutex); }

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Matthew R. Ochs59100.00%1100.00%
Total59100.00%1100.00%

/** * cxlflash_list_init() - initializes the global LUN list */
void cxlflash_list_init(void) { INIT_LIST_HEAD(&global.gluns); mutex_init(&global.mutex); global.err_page = NULL; }

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Matthew R. Ochs29100.00%1100.00%
Total29100.00%1100.00%

/** * cxlflash_term_global_luns() - frees resources associated with global LUN list */
void cxlflash_term_global_luns(void) { struct glun_info *gli, *temp; mutex_lock(&global.mutex); list_for_each_entry_safe(gli, temp, &global.gluns, list) { list_del(&gli->list); cxlflash_ba_terminate(&gli->blka.ba_lun); kfree(gli); } mutex_unlock(&global.mutex); }

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Matthew R. Ochs66100.00%2100.00%
Total66100.00%2100.00%

/** * 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 */
int cxlflash_manage_lun(struct scsi_device *sdev, struct dk_cxlflash_manage_lun *manage) { struct cxlflash_cfg *cfg = shost_priv(sdev->host); struct device *dev = &cfg->dev->dev; struct llun_info *lli = NULL; int rc = 0; u64 flags = manage->hdr.flags; u32 chan = sdev->channel; mutex_lock(&global.mutex); lli = find_and_create_lun(sdev, manage->wwid); dev_dbg(dev, "%s: WWID=%016llx%016llx, flags=%016llx lli=%p\n", __func__, get_unaligned_be64(&manage->wwid[0]), get_unaligned_be64(&manage->wwid[8]), manage->hdr.flags, lli); if (unlikely(!lli)) { rc = -ENOMEM; goto out; } if (flags & DK_CXLFLASH_MANAGE_LUN_ENABLE_SUPERPIPE) { /* * Update port selection mask based upon channel, store off LUN * in unpacked, AFU-friendly format, and hang LUN reference in * the sdev. */ lli->port_sel |= CHAN2PORT(chan); lli->lun_id[chan] = lun_to_lunid(sdev->lun); sdev->hostdata = lli; } else if (flags & DK_CXLFLASH_MANAGE_LUN_DISABLE_SUPERPIPE) { if (lli->parent->mode != MODE_NONE) rc = -EBUSY; else { /* * Clean up local LUN for this port and reset table * tracking when no more references exist. */ sdev->hostdata = NULL; lli->port_sel &= ~CHAN2PORT(chan); if (lli->port_sel == 0U) lli->in_table = false; } } dev_dbg(dev, "%s: port_sel=%08x chan=%u lun_id=%016llx\n", __func__, lli->port_sel, chan, lli->lun_id[chan]); out: mutex_unlock(&global.mutex); dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Matthew R. Ochs25489.12%360.00%
Manoj N. Kumar165.61%120.00%
Uma Krishnan155.26%120.00%
Total285100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Matthew R. Ochs99296.88%466.67%
Manoj N. Kumar171.66%116.67%
Uma Krishnan151.46%116.67%
Total1024100.00%6100.00%
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