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/*
* 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
*
* 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.
*/
#define OCXL_MAX_IRQS 4 /* Max interrupts per process */
struct ocxlflash_irqs {
int hwirq;
u32 virq;
u64 ptrig;
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 */
};
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