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Diffstat (limited to '')
-rw-r--r-- | drivers/scsi/cxlflash/ocxl_hw.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h new file mode 100644 index 0000000000..f2fe88816b --- /dev/null +++ b/drivers/scsi/cxlflash/ocxl_hw.h @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * CXL Flash Device Driver + * + * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation + * Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation + * + * Copyright (C) 2018 IBM Corporation + */ + +#define OCXL_MAX_IRQS 4 /* Max interrupts per process */ + +struct ocxlflash_irqs { + int hwirq; + u32 virq; + void __iomem *vtrig; +}; + +/* OCXL hardware AFU associated with the host */ +struct ocxl_hw_afu { + struct ocxlflash_context *ocxl_ctx; /* Host context */ + struct pci_dev *pdev; /* PCI device */ + struct device *dev; /* Generic device */ + bool perst_same_image; /* Same image loaded on perst */ + + struct ocxl_fn_config fcfg; /* DVSEC config of the function */ + struct ocxl_afu_config acfg; /* AFU configuration data */ + + int fn_actag_base; /* Function acTag base */ + int fn_actag_enabled; /* Function acTag number enabled */ + int afu_actag_base; /* AFU acTag base */ + int afu_actag_enabled; /* AFU acTag number enabled */ + + phys_addr_t ppmmio_phys; /* Per process MMIO space */ + phys_addr_t gmmio_phys; /* Global AFU MMIO space */ + void __iomem *gmmio_virt; /* Global MMIO map */ + + void *link_token; /* Link token for the SPA */ + struct idr idr; /* IDR to manage contexts */ + int max_pasid; /* Maximum number of contexts */ + bool is_present; /* Function has AFUs defined */ +}; + +enum ocxlflash_ctx_state { + CLOSED, + OPENED, + STARTED +}; + +struct ocxlflash_context { + struct ocxl_hw_afu *hw_afu; /* HW AFU back pointer */ + struct address_space *mapping; /* Mapping for pseudo filesystem */ + bool master; /* Whether this is a master context */ + int pe; /* Process element */ + + phys_addr_t psn_phys; /* Process mapping */ + u64 psn_size; /* Process mapping size */ + + spinlock_t slock; /* Protects irq/fault/event updates */ + wait_queue_head_t wq; /* Wait queue for poll and interrupts */ + struct mutex state_mutex; /* Mutex to update context state */ + enum ocxlflash_ctx_state state; /* Context state */ + + struct ocxlflash_irqs *irqs; /* Pointer to array of structures */ + int num_irqs; /* Number of interrupts */ + bool pending_irq; /* Pending interrupt on the context */ + ulong irq_bitmap; /* Bits indicating pending irq num */ + + u64 fault_addr; /* Address that triggered the fault */ + u64 fault_dsisr; /* Value of dsisr register at fault */ + bool pending_fault; /* Pending translation fault */ +}; |