Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 340 insertions, 0 deletions

diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
new file mode 100644
index 0000000000..de6229e27b
--- /dev/null
+++ b/drivers/scsi/cxlflash/common.h
@@ -0,0 +1,340 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * 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
+ */
+
+#ifndef _CXLFLASH_COMMON_H
+#define _CXLFLASH_COMMON_H
+
+#include <linux/async.h>
+#include <linux/cdev.h>
+#include <linux/irq_poll.h>
+#include <linux/list.h>
+#include <linux/rwsem.h>
+#include <linux/types.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+
+#include "backend.h"
+
+extern const struct file_operations cxlflash_cxl_fops;
+
+#define MAX_CONTEXT	CXLFLASH_MAX_CONTEXT	/* num contexts per afu */
+#define MAX_FC_PORTS	CXLFLASH_MAX_FC_PORTS	/* max ports per AFU */
+#define LEGACY_FC_PORTS	2			/* legacy ports per AFU */
+
+#define CHAN2PORTBANK(_x)	((_x) >> ilog2(CXLFLASH_NUM_FC_PORTS_PER_BANK))
+#define CHAN2BANKPORT(_x)	((_x) & (CXLFLASH_NUM_FC_PORTS_PER_BANK - 1))
+
+#define CHAN2PORTMASK(_x)	(1 << (_x))	/* channel to port mask */
+#define PORTMASK2CHAN(_x)	(ilog2((_x)))	/* port mask to channel */
+#define PORTNUM2CHAN(_x)	((_x) - 1)	/* port number to channel */
+
+#define CXLFLASH_BLOCK_SIZE	4096		/* 4K blocks */
+#define CXLFLASH_MAX_XFER_SIZE	16777216	/* 16MB transfer */
+#define CXLFLASH_MAX_SECTORS	(CXLFLASH_MAX_XFER_SIZE/512)	/* SCSI wants
+								 * max_sectors
+								 * in units of
+								 * 512 byte
+								 * sectors
+								 */
+
+#define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry))
+
+/* AFU command retry limit */
+#define MC_RETRY_CNT	5	/* Sufficient for SCSI and certain AFU errors */
+
+/* Command management definitions */
+#define CXLFLASH_MAX_CMDS               256
+#define CXLFLASH_MAX_CMDS_PER_LUN       CXLFLASH_MAX_CMDS
+
+/* RRQ for master issued cmds */
+#define NUM_RRQ_ENTRY                   CXLFLASH_MAX_CMDS
+
+/* SQ for master issued cmds */
+#define NUM_SQ_ENTRY			CXLFLASH_MAX_CMDS
+
+/* Hardware queue definitions */
+#define CXLFLASH_DEF_HWQS		1
+#define CXLFLASH_MAX_HWQS		8
+#define PRIMARY_HWQ			0
+
+
+static inline void check_sizes(void)
+{
+	BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_NUM_FC_PORTS_PER_BANK);
+	BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_MAX_CMDS);
+}
+
+/* AFU defines a fixed size of 4K for command buffers (borrow 4K page define) */
+#define CMD_BUFSIZE     SIZE_4K
+
+enum cxlflash_lr_state {
+	LINK_RESET_INVALID,
+	LINK_RESET_REQUIRED,
+	LINK_RESET_COMPLETE
+};
+
+enum cxlflash_init_state {
+	INIT_STATE_NONE,
+	INIT_STATE_PCI,
+	INIT_STATE_AFU,
+	INIT_STATE_SCSI,
+	INIT_STATE_CDEV
+};
+
+enum cxlflash_state {
+	STATE_PROBING,	/* Initial state during probe */
+	STATE_PROBED,	/* Temporary state, probe completed but EEH occurred */
+	STATE_NORMAL,	/* Normal running state, everything good */
+	STATE_RESET,	/* Reset state, trying to reset/recover */
+	STATE_FAILTERM	/* Failed/terminating state, error out users/threads */
+};
+
+enum cxlflash_hwq_mode {
+	HWQ_MODE_RR,	/* Roundrobin (default) */
+	HWQ_MODE_TAG,	/* Distribute based on block MQ tag */
+	HWQ_MODE_CPU,	/* CPU affinity */
+	MAX_HWQ_MODE
+};
+
+/*
+ * Each context has its own set of resource handles that is visible
+ * only from that context.
+ */
+
+struct cxlflash_cfg {
+	struct afu *afu;
+
+	const struct cxlflash_backend_ops *ops;
+	struct pci_dev *dev;
+	struct pci_device_id *dev_id;
+	struct Scsi_Host *host;
+	int num_fc_ports;
+	struct cdev cdev;
+	struct device *chardev;
+
+	ulong cxlflash_regs_pci;
+
+	struct work_struct work_q;
+	enum cxlflash_init_state init_state;
+	enum cxlflash_lr_state lr_state;
+	int lr_port;
+	atomic_t scan_host_needed;
+
+	void *afu_cookie;
+
+	atomic_t recovery_threads;
+	struct mutex ctx_recovery_mutex;
+	struct mutex ctx_tbl_list_mutex;
+	struct rw_semaphore ioctl_rwsem;
+	struct ctx_info *ctx_tbl[MAX_CONTEXT];
+	struct list_head ctx_err_recovery; /* contexts w/ recovery pending */
+	struct file_operations cxl_fops;
+
+	/* Parameters that are LUN table related */
+	int last_lun_index[MAX_FC_PORTS];
+	int promote_lun_index;
+	struct list_head lluns; /* list of llun_info structs */
+
+	wait_queue_head_t tmf_waitq;
+	spinlock_t tmf_slock;
+	bool tmf_active;
+	bool ws_unmap;		/* Write-same unmap supported */
+	wait_queue_head_t reset_waitq;
+	enum cxlflash_state state;
+	async_cookie_t async_reset_cookie;
+};
+
+struct afu_cmd {
+	struct sisl_ioarcb rcb;	/* IOARCB (cache line aligned) */
+	struct sisl_ioasa sa;	/* IOASA must follow IOARCB */
+	struct afu *parent;
+	struct scsi_cmnd *scp;
+	struct completion cevent;
+	struct list_head queue;
+	u32 hwq_index;
+
+	u8 cmd_tmf:1,
+	   cmd_aborted:1;
+
+	struct list_head list;	/* Pending commands link */
+
+	/* As per the SISLITE spec the IOARCB EA has to be 16-byte aligned.
+	 * However for performance reasons the IOARCB/IOASA should be
+	 * cache line aligned.
+	 */
+} __aligned(cache_line_size());
+
+static inline struct afu_cmd *sc_to_afuc(struct scsi_cmnd *sc)
+{
+	return PTR_ALIGN(scsi_cmd_priv(sc), __alignof__(struct afu_cmd));
+}
+
+static inline struct afu_cmd *sc_to_afuci(struct scsi_cmnd *sc)
+{
+	struct afu_cmd *afuc = sc_to_afuc(sc);
+
+	INIT_LIST_HEAD(&afuc->queue);
+	return afuc;
+}
+
+static inline struct afu_cmd *sc_to_afucz(struct scsi_cmnd *sc)
+{
+	struct afu_cmd *afuc = sc_to_afuc(sc);
+
+	memset(afuc, 0, sizeof(*afuc));
+	return sc_to_afuci(sc);
+}
+
+struct hwq {
+	/* Stuff requiring alignment go first. */
+	struct sisl_ioarcb sq[NUM_SQ_ENTRY];		/* 16K SQ */
+	u64 rrq_entry[NUM_RRQ_ENTRY];			/* 2K RRQ */
+
+	/* Beware of alignment till here. Preferably introduce new
+	 * fields after this point
+	 */
+	struct afu *afu;
+	void *ctx_cookie;
+	struct sisl_host_map __iomem *host_map;		/* MC host map */
+	struct sisl_ctrl_map __iomem *ctrl_map;		/* MC control map */
+	ctx_hndl_t ctx_hndl;	/* master's context handle */
+	u32 index;		/* Index of this hwq */
+	int num_irqs;		/* Number of interrupts requested for context */
+	struct list_head pending_cmds;	/* Commands pending completion */
+
+	atomic_t hsq_credits;
+	spinlock_t hsq_slock;	/* Hardware send queue lock */
+	struct sisl_ioarcb *hsq_start;
+	struct sisl_ioarcb *hsq_end;
+	struct sisl_ioarcb *hsq_curr;
+	spinlock_t hrrq_slock;
+	u64 *hrrq_start;
+	u64 *hrrq_end;
+	u64 *hrrq_curr;
+	bool toggle;
+	bool hrrq_online;
+
+	s64 room;
+
+	struct irq_poll irqpoll;
+} __aligned(cache_line_size());
+
+struct afu {
+	struct hwq hwqs[CXLFLASH_MAX_HWQS];
+	int (*send_cmd)(struct afu *afu, struct afu_cmd *cmd);
+	int (*context_reset)(struct hwq *hwq);
+
+	/* AFU HW */
+	struct cxlflash_afu_map __iomem *afu_map;	/* entire MMIO map */
+
+	atomic_t cmds_active;	/* Number of currently active AFU commands */
+	struct mutex sync_active;	/* Mutex to serialize AFU commands */
+	u64 hb;
+	u32 internal_lun;	/* User-desired LUN mode for this AFU */
+
+	u32 num_hwqs;		/* Number of hardware queues */
+	u32 desired_hwqs;	/* Desired h/w queues, effective on AFU reset */
+	enum cxlflash_hwq_mode hwq_mode; /* Steering mode for h/w queues */
+	u32 hwq_rr_count;	/* Count to distribute traffic for roundrobin */
+
+	char version[16];
+	u64 interface_version;
+
+	u32 irqpoll_weight;
+	struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */
+};
+
+static inline struct hwq *get_hwq(struct afu *afu, u32 index)
+{
+	WARN_ON(index >= CXLFLASH_MAX_HWQS);
+
+	return &afu->hwqs[index];
+}
+
+static inline bool afu_is_irqpoll_enabled(struct afu *afu)
+{
+	return !!afu->irqpoll_weight;
+}
+
+static inline bool afu_has_cap(struct afu *afu, u64 cap)
+{
+	u64 afu_cap = afu->interface_version >> SISL_INTVER_CAP_SHIFT;
+
+	return afu_cap & cap;
+}
+
+static inline bool afu_is_ocxl_lisn(struct afu *afu)
+{
+	return afu_has_cap(afu, SISL_INTVER_CAP_OCXL_LISN);
+}
+
+static inline bool afu_is_afu_debug(struct afu *afu)
+{
+	return afu_has_cap(afu, SISL_INTVER_CAP_AFU_DEBUG);
+}
+
+static inline bool afu_is_lun_provision(struct afu *afu)
+{
+	return afu_has_cap(afu, SISL_INTVER_CAP_LUN_PROVISION);
+}
+
+static inline bool afu_is_sq_cmd_mode(struct afu *afu)
+{
+	return afu_has_cap(afu, SISL_INTVER_CAP_SQ_CMD_MODE);
+}
+
+static inline bool afu_is_ioarrin_cmd_mode(struct afu *afu)
+{
+	return afu_has_cap(afu, SISL_INTVER_CAP_IOARRIN_CMD_MODE);
+}
+
+static inline u64 lun_to_lunid(u64 lun)
+{
+	__be64 lun_id;
+
+	int_to_scsilun(lun, (struct scsi_lun *)&lun_id);
+	return be64_to_cpu(lun_id);
+}
+
+static inline struct fc_port_bank __iomem *get_fc_port_bank(
+					    struct cxlflash_cfg *cfg, int i)
+{
+	struct afu *afu = cfg->afu;
+
+	return &afu->afu_map->global.bank[CHAN2PORTBANK(i)];
+}
+
+static inline __be64 __iomem *get_fc_port_regs(struct cxlflash_cfg *cfg, int i)
+{
+	struct fc_port_bank __iomem *fcpb = get_fc_port_bank(cfg, i);
+
+	return &fcpb->fc_port_regs[CHAN2BANKPORT(i)][0];
+}
+
+static inline __be64 __iomem *get_fc_port_luns(struct cxlflash_cfg *cfg, int i)
+{
+	struct fc_port_bank __iomem *fcpb = get_fc_port_bank(cfg, i);
+
+	return &fcpb->fc_port_luns[CHAN2BANKPORT(i)][0];
+}
+
+int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t c, res_hndl_t r, u8 mode);
+void cxlflash_list_init(void);
+void cxlflash_term_global_luns(void);
+void cxlflash_free_errpage(void);
+int cxlflash_ioctl(struct scsi_device *sdev, unsigned int cmd,
+		   void __user *arg);
+void cxlflash_stop_term_user_contexts(struct cxlflash_cfg *cfg);
+int cxlflash_mark_contexts_error(struct cxlflash_cfg *cfg);
+void cxlflash_term_local_luns(struct cxlflash_cfg *cfg);
+void cxlflash_restore_luntable(struct cxlflash_cfg *cfg);
+
+#endif /* ifndef _CXLFLASH_COMMON_H */