drivers/scsi/cxlflash/ocxl_hw.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * CXL Flash Device Driver
   4  *
   5  * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
   6  *             Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
   7  *
   8  * Copyright (C) 2018 IBM Corporation
   9  */
  10
  11 #define OCXL_MAX_IRQS   4       /* Max interrupts per process */
  12
  13 struct ocxlflash_irqs {
  14         int hwirq;
  15         u32 virq;
  16         void __iomem *vtrig;
  17 };
  18
  19 /* OCXL hardware AFU associated with the host */
  20 struct ocxl_hw_afu {
  21         struct ocxlflash_context *ocxl_ctx; /* Host context */
  22         struct pci_dev *pdev;           /* PCI device */
  23         struct device *dev;             /* Generic device */
  24         bool perst_same_image;          /* Same image loaded on perst */
  25
  26         struct ocxl_fn_config fcfg;     /* DVSEC config of the function */
  27         struct ocxl_afu_config acfg;    /* AFU configuration data */
  28
  29         int fn_actag_base;              /* Function acTag base */
  30         int fn_actag_enabled;           /* Function acTag number enabled */
  31         int afu_actag_base;             /* AFU acTag base */
  32         int afu_actag_enabled;          /* AFU acTag number enabled */
  33
  34         phys_addr_t ppmmio_phys;        /* Per process MMIO space */
  35         phys_addr_t gmmio_phys;         /* Global AFU MMIO space */
  36         void __iomem *gmmio_virt;       /* Global MMIO map */
  37
  38         void *link_token;               /* Link token for the SPA */
  39         struct idr idr;                 /* IDR to manage contexts */
  40         int max_pasid;                  /* Maximum number of contexts */
  41         bool is_present;                /* Function has AFUs defined */
  42 };
  43
  44 enum ocxlflash_ctx_state {
  45         CLOSED,
  46         OPENED,
  47         STARTED
  48 };
  49
  50 struct ocxlflash_context {
  51         struct ocxl_hw_afu *hw_afu;     /* HW AFU back pointer */
  52         struct address_space *mapping;  /* Mapping for pseudo filesystem */
  53         bool master;                    /* Whether this is a master context */
  54         int pe;                         /* Process element */
  55
  56         phys_addr_t psn_phys;           /* Process mapping */
  57         u64 psn_size;                   /* Process mapping size */
  58
  59         spinlock_t slock;               /* Protects irq/fault/event updates */
  60         wait_queue_head_t wq;           /* Wait queue for poll and interrupts */
  61         struct mutex state_mutex;       /* Mutex to update context state */
  62         enum ocxlflash_ctx_state state; /* Context state */
  63
  64         struct ocxlflash_irqs *irqs;    /* Pointer to array of structures */
  65         int num_irqs;                   /* Number of interrupts */
  66         bool pending_irq;               /* Pending interrupt on the context */
  67         ulong irq_bitmap;               /* Bits indicating pending irq num */
  68
  69         u64 fault_addr;                 /* Address that triggered the fault */
  70         u64 fault_dsisr;                /* Value of dsisr register at fault */
  71         bool pending_fault;             /* Pending translation fault */
  72 };