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usr
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src
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linux-headers-6.8.0-83
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arch
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powerpc
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include
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asm
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vas.h
/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright 2016-17 IBM Corp. */ #ifndef _ASM_POWERPC_VAS_H #define _ASM_POWERPC_VAS_H #include <linux/sched/mm.h> #include <linux/mmu_context.h> #include <asm/icswx.h> #include <uapi/asm/vas-api.h> /* * Min and max FIFO sizes are based on Version 1.05 Section 3.1.4.25 * (Local FIFO Size Register) of the VAS workbook. */ #define VAS_RX_FIFO_SIZE_MIN (1 << 10) /* 1KB */ #define VAS_RX_FIFO_SIZE_MAX (8 << 20) /* 8MB */ /* * Threshold Control Mode: Have paste operation fail if the number of * requests in receive FIFO exceeds a threshold. * * NOTE: No special error code yet if paste is rejected because of these * limits. So users can't distinguish between this and other errors. */ #define VAS_THRESH_DISABLED 0 #define VAS_THRESH_FIFO_GT_HALF_FULL 1 #define VAS_THRESH_FIFO_GT_QTR_FULL 2 #define VAS_THRESH_FIFO_GT_EIGHTH_FULL 3 /* * VAS window Linux status bits */ #define VAS_WIN_ACTIVE 0x0 /* Used in platform independent */ /* vas mmap() */ /* Window is closed in the hypervisor due to lost credit */ #define VAS_WIN_NO_CRED_CLOSE 0x00000001 /* Window is closed due to migration */ #define VAS_WIN_MIGRATE_CLOSE 0x00000002 /* * Get/Set bit fields */ #define GET_FIELD(m, v) (((v) & (m)) >> MASK_LSH(m)) #define MASK_LSH(m) (__builtin_ffsl(m) - 1) #define SET_FIELD(m, v, val) \ (((v) & ~(m)) | ((((typeof(v))(val)) << MASK_LSH(m)) & (m))) /* * Co-processor Engine type. */ enum vas_cop_type { VAS_COP_TYPE_FAULT, VAS_COP_TYPE_842, VAS_COP_TYPE_842_HIPRI, VAS_COP_TYPE_GZIP, VAS_COP_TYPE_GZIP_HIPRI, VAS_COP_TYPE_FTW, VAS_COP_TYPE_MAX, }; /* * User space VAS windows are opened by tasks and take references * to pid and mm until windows are closed. * Stores pid, mm, and tgid for each window. */ struct vas_user_win_ref { struct pid *pid; /* PID of owner */ struct pid *tgid; /* Thread group ID of owner */ struct mm_struct *mm; /* Linux process mm_struct */ struct mutex mmap_mutex; /* protects paste address mmap() */ /* with DLPAR close/open windows */ struct vm_area_struct *vma; /* Save VMA and used in DLPAR ops */ }; /* * Common VAS window struct on PowerNV and PowerVM */ struct vas_window { u32 winid; u32 wcreds_max; /* Window credits */ u32 status; /* Window status used in OS */ enum vas_cop_type cop; struct vas_user_win_ref task_ref; char *dbgname; struct dentry *dbgdir; }; /* * User space window operations used for powernv and powerVM */ struct vas_user_win_ops { struct vas_window * (*open_win)(int vas_id, u64 flags, enum vas_cop_type); u64 (*paste_addr)(struct vas_window *); int (*close_win)(struct vas_window *); }; static inline void put_vas_user_win_ref(struct vas_user_win_ref *ref) { /* Drop references to pid, tgid, and mm */ put_pid(ref->pid); put_pid(ref->tgid); if (ref->mm) mmdrop(ref->mm); } static inline void vas_user_win_add_mm_context(struct vas_user_win_ref *ref) { mm_context_add_vas_window(ref->mm); /* * Even a process that has no foreign real address mapping can * use an unpaired COPY instruction (to no real effect). Issue * CP_ABORT to clear any pending COPY and prevent a covert * channel. * * __switch_to() will issue CP_ABORT on future context switches * if process / thread has any open VAS window (Use * current->mm->context.vas_windows). */ asm volatile(PPC_CP_ABORT); } /* * Receive window attributes specified by the (in-kernel) owner of window. */ struct vas_rx_win_attr { u64 rx_fifo; int rx_fifo_size; int wcreds_max; bool pin_win; bool rej_no_credit; bool tx_wcred_mode; bool rx_wcred_mode; bool tx_win_ord_mode; bool rx_win_ord_mode; bool data_stamp; bool nx_win; bool fault_win; bool user_win; bool notify_disable; bool intr_disable; bool notify_early; int lnotify_lpid; int lnotify_pid; int lnotify_tid; u32 pswid; int tc_mode; }; /* * Window attributes specified by the in-kernel owner of a send window. */ struct vas_tx_win_attr { enum vas_cop_type cop; int wcreds_max; int lpid; int pidr; /* hardware PID (from SPRN_PID) */ int pswid; int rsvd_txbuf_count; int tc_mode; bool user_win; bool pin_win; bool rej_no_credit; bool rsvd_txbuf_enable; bool tx_wcred_mode; bool rx_wcred_mode; bool tx_win_ord_mode; bool rx_win_ord_mode; }; #ifdef CONFIG_PPC_POWERNV /* * Helper to map a chip id to VAS id. * For POWER9, this is a 1:1 mapping. In the future this maybe a 1:N * mapping in which case, we will need to update this helper. * * Return the VAS id or -1 if no matching vasid is found. */ int chip_to_vas_id(int chipid); /* * Helper to initialize receive window attributes to defaults for an * NX window. */ void vas_init_rx_win_attr(struct vas_rx_win_attr *rxattr, enum vas_cop_type cop); /* * Open a VAS receive window for the instance of VAS identified by @vasid * Use @attr to initialize the attributes of the window. * * Return a handle to the window or ERR_PTR() on error. */ struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop, struct vas_rx_win_attr *attr); /* * Helper to initialize send window attributes to defaults for an NX window. */ extern void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr, enum vas_cop_type cop); /* * Open a VAS send window for the instance of VAS identified by @vasid * and the co-processor type @cop. Use @attr to initialize attributes * of the window. * * Note: The instance of VAS must already have an open receive window for * the coprocessor type @cop. * * Return a handle to the send window or ERR_PTR() on error. */ struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop, struct vas_tx_win_attr *attr); /* * Close the send or receive window identified by @win. For receive windows * return -EAGAIN if there are active send windows attached to this receive * window. */ int vas_win_close(struct vas_window *win); /* * Copy the co-processor request block (CRB) @crb into the local L2 cache. */ int vas_copy_crb(void *crb, int offset); /* * Paste a previously copied CRB (see vas_copy_crb()) from the L2 cache to * the hardware address associated with the window @win. @re is expected/ * assumed to be true for NX windows. */ int vas_paste_crb(struct vas_window *win, int offset, bool re); int vas_register_api_powernv(struct module *mod, enum vas_cop_type cop_type, const char *name); void vas_unregister_api_powernv(void); #endif #ifdef CONFIG_PPC_PSERIES /* VAS Capabilities */ #define VAS_GZIP_QOS_FEAT 0x1 #define VAS_GZIP_DEF_FEAT 0x2 #define VAS_GZIP_QOS_FEAT_BIT PPC_BIT(VAS_GZIP_QOS_FEAT) /* Bit 1 */ #define VAS_GZIP_DEF_FEAT_BIT PPC_BIT(VAS_GZIP_DEF_FEAT) /* Bit 2 */ /* NX Capabilities */ #define VAS_NX_GZIP_FEAT 0x1 #define VAS_NX_GZIP_FEAT_BIT PPC_BIT(VAS_NX_GZIP_FEAT) /* Bit 1 */ /* * These structs are used to retrieve overall VAS capabilities that * the hypervisor provides. */ struct hv_vas_all_caps { __be64 descriptor; __be64 feat_type; } __packed __aligned(0x1000); struct vas_all_caps { u64 descriptor; u64 feat_type; }; int h_query_vas_capabilities(const u64 hcall, u8 query_type, u64 result); int vas_register_api_pseries(struct module *mod, enum vas_cop_type cop_type, const char *name); void vas_unregister_api_pseries(void); #endif /* * Register / unregister coprocessor type to VAS API which will be exported * to user space. Applications can use this API to open / close window * which can be used to send / receive requests directly to cooprcessor. * * Only NX GZIP coprocessor type is supported now, but this API can be * used for others in future. */ int vas_register_coproc_api(struct module *mod, enum vas_cop_type cop_type, const char *name, const struct vas_user_win_ops *vops); void vas_unregister_coproc_api(void); int get_vas_user_win_ref(struct vas_user_win_ref *task_ref); void vas_update_csb(struct coprocessor_request_block *crb, struct vas_user_win_ref *task_ref); void vas_dump_crb(struct coprocessor_request_block *crb); #endif /* __ASM_POWERPC_VAS_H */
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