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1 | /* |
2 | * Copyright 2017 IBM Corp. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #ifndef _MISC_CXLLIB_H | |
11 | #define _MISC_CXLLIB_H | |
12 | ||
13 | #include <linux/pci.h> | |
14 | #include <asm/reg.h> | |
15 | ||
16 | /* | |
17 | * cxl driver exports a in-kernel 'library' API which can be called by | |
18 | * other drivers to help interacting with an IBM XSL. | |
19 | */ | |
20 | ||
21 | /* | |
22 | * tells whether capi is supported on the PCIe slot where the | |
23 | * device is seated | |
24 | * | |
25 | * Input: | |
26 | * dev: device whose slot needs to be checked | |
27 | * flags: 0 for the time being | |
28 | */ | |
29 | bool cxllib_slot_is_supported(struct pci_dev *dev, unsigned long flags); | |
30 | ||
31 | ||
32 | /* | |
33 | * Returns the configuration parameters to be used by the XSL or device | |
34 | * | |
35 | * Input: | |
36 | * dev: device, used to find PHB | |
37 | * Output: | |
38 | * struct cxllib_xsl_config: | |
39 | * version | |
40 | * capi BAR address, i.e. 0x2000000000000-0x2FFFFFFFFFFFF | |
41 | * capi BAR size | |
42 | * data send control (XSL_DSNCTL) | |
43 | * dummy read address (XSL_DRA) | |
44 | */ | |
45 | #define CXL_XSL_CONFIG_VERSION1 1 | |
46 | struct cxllib_xsl_config { | |
47 | u32 version; /* format version for register encoding */ | |
48 | u32 log_bar_size;/* log size of the capi_window */ | |
49 | u64 bar_addr; /* address of the start of capi window */ | |
50 | u64 dsnctl; /* matches definition of XSL_DSNCTL */ | |
51 | u64 dra; /* real address that can be used for dummy read */ | |
52 | }; | |
53 | ||
54 | int cxllib_get_xsl_config(struct pci_dev *dev, struct cxllib_xsl_config *cfg); | |
55 | ||
56 | ||
57 | /* | |
58 | * Activate capi for the pci host bridge associated with the device. | |
59 | * Can be extended to deactivate once we know how to do it. | |
60 | * Device must be ready to accept messages from the CAPP unit and | |
61 | * respond accordingly (TLB invalidates, ...) | |
62 | * | |
63 | * PHB is switched to capi mode through calls to skiboot. | |
64 | * CAPP snooping is activated | |
65 | * | |
66 | * Input: | |
67 | * dev: device whose PHB should switch mode | |
68 | * mode: mode to switch to i.e. CAPI or PCI | |
69 | * flags: options related to the mode | |
70 | */ | |
71 | enum cxllib_mode { | |
72 | CXL_MODE_CXL, | |
73 | CXL_MODE_PCI, | |
74 | }; | |
75 | ||
76 | #define CXL_MODE_NO_DMA 0 | |
77 | #define CXL_MODE_DMA_TVT0 1 | |
78 | #define CXL_MODE_DMA_TVT1 2 | |
79 | ||
80 | int cxllib_switch_phb_mode(struct pci_dev *dev, enum cxllib_mode mode, | |
81 | unsigned long flags); | |
82 | ||
83 | ||
84 | /* | |
85 | * Set the device for capi DMA. | |
86 | * Define its dma_ops and dma offset so that allocations will be using TVT#1 | |
87 | * | |
88 | * Input: | |
89 | * dev: device to set | |
90 | * flags: options. CXL_MODE_DMA_TVT1 should be used | |
91 | */ | |
92 | int cxllib_set_device_dma(struct pci_dev *dev, unsigned long flags); | |
93 | ||
94 | ||
95 | /* | |
96 | * Get the Process Element structure for the given thread | |
97 | * | |
98 | * Input: | |
99 | * task: task_struct for the context of the translation | |
100 | * translation_mode: whether addresses should be translated | |
101 | * Output: | |
102 | * attr: attributes to fill up the Process Element structure from CAIA | |
103 | */ | |
104 | struct cxllib_pe_attributes { | |
105 | u64 sr; | |
106 | u32 lpid; | |
107 | u32 tid; | |
108 | u32 pid; | |
109 | }; | |
110 | #define CXL_TRANSLATED_MODE 0 | |
111 | #define CXL_REAL_MODE 1 | |
112 | ||
113 | int cxllib_get_PE_attributes(struct task_struct *task, | |
114 | unsigned long translation_mode, struct cxllib_pe_attributes *attr); | |
115 | ||
116 | ||
117 | /* | |
118 | * Handle memory fault. | |
119 | * Fault in all the pages of the specified buffer for the permissions | |
120 | * provided in ‘flags’ | |
121 | * | |
122 | * Shouldn't be called from interrupt context | |
123 | * | |
124 | * Input: | |
125 | * mm: struct mm for the thread faulting the pages | |
126 | * addr: base address of the buffer to page in | |
127 | * size: size of the buffer to page in | |
128 | * flags: permission requested (DSISR_ISSTORE...) | |
129 | */ | |
130 | int cxllib_handle_fault(struct mm_struct *mm, u64 addr, u64 size, u64 flags); | |
131 | ||
132 | ||
133 | #endif /* _MISC_CXLLIB_H */ |