USB: use genalloc for USB HCs with local memory
[platform/kernel/linux-starfive.git] / drivers / usb / host / ohci-mem.c
1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3  * OHCI HCD (Host Controller Driver) for USB.
4  *
5  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
6  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
7  *
8  * This file is licenced under the GPL.
9  */
10
11 /*-------------------------------------------------------------------------*/
12
13 /*
14  * OHCI deals with three types of memory:
15  *      - data used only by the HCD ... kmalloc is fine
16  *      - async and periodic schedules, shared by HC and HCD ... these
17  *        need to use dma_pool or dma_alloc_coherent
18  *      - driver buffers, read/written by HC ... the hcd glue or the
19  *        device driver provides us with dma addresses
20  *
21  * There's also "register" data, which is memory mapped.
22  * No memory seen by this driver (or any HCD) may be paged out.
23  */
24
25 /*-------------------------------------------------------------------------*/
26
27 static void ohci_hcd_init (struct ohci_hcd *ohci)
28 {
29         ohci->next_statechange = jiffies;
30         spin_lock_init (&ohci->lock);
31         INIT_LIST_HEAD (&ohci->pending);
32         INIT_LIST_HEAD(&ohci->eds_in_use);
33 }
34
35 /*-------------------------------------------------------------------------*/
36
37 static int ohci_mem_init (struct ohci_hcd *ohci)
38 {
39         /*
40          * HCs with local memory allocate from localmem_pool so there's
41          * no need to create the below dma pools.
42          */
43         if (ohci_to_hcd(ohci)->localmem_pool)
44                 return 0;
45
46         ohci->td_cache = dma_pool_create ("ohci_td",
47                 ohci_to_hcd(ohci)->self.controller,
48                 sizeof (struct td),
49                 32 /* byte alignment */,
50                 0 /* no page-crossing issues */);
51         if (!ohci->td_cache)
52                 return -ENOMEM;
53         ohci->ed_cache = dma_pool_create ("ohci_ed",
54                 ohci_to_hcd(ohci)->self.controller,
55                 sizeof (struct ed),
56                 16 /* byte alignment */,
57                 0 /* no page-crossing issues */);
58         if (!ohci->ed_cache) {
59                 dma_pool_destroy (ohci->td_cache);
60                 return -ENOMEM;
61         }
62         return 0;
63 }
64
65 static void ohci_mem_cleanup (struct ohci_hcd *ohci)
66 {
67         dma_pool_destroy(ohci->td_cache);
68         ohci->td_cache = NULL;
69         dma_pool_destroy(ohci->ed_cache);
70         ohci->ed_cache = NULL;
71 }
72
73 /*-------------------------------------------------------------------------*/
74
75 /* ohci "done list" processing needs this mapping */
76 static inline struct td *
77 dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma)
78 {
79         struct td *td;
80
81         td_dma &= TD_MASK;
82         td = hc->td_hash [TD_HASH_FUNC(td_dma)];
83         while (td && td->td_dma != td_dma)
84                 td = td->td_hash;
85         return td;
86 }
87
88 /* TDs ... */
89 static struct td *
90 td_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
91 {
92         dma_addr_t      dma;
93         struct td       *td;
94         struct usb_hcd  *hcd = ohci_to_hcd(hc);
95
96         if (hcd->localmem_pool)
97                 td = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*td), &dma);
98         else
99                 td = dma_pool_zalloc(hc->td_cache, mem_flags, &dma);
100         if (td) {
101                 /* in case hc fetches it, make it look dead */
102                 td->hwNextTD = cpu_to_hc32 (hc, dma);
103                 td->td_dma = dma;
104                 /* hashed in td_fill */
105         }
106         return td;
107 }
108
109 static void
110 td_free (struct ohci_hcd *hc, struct td *td)
111 {
112         struct td       **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];
113         struct usb_hcd  *hcd = ohci_to_hcd(hc);
114
115         while (*prev && *prev != td)
116                 prev = &(*prev)->td_hash;
117         if (*prev)
118                 *prev = td->td_hash;
119         else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0)
120                 ohci_dbg (hc, "no hash for td %p\n", td);
121
122         if (hcd->localmem_pool)
123                 gen_pool_free(hcd->localmem_pool, (unsigned long)td,
124                               sizeof(*td));
125         else
126                 dma_pool_free(hc->td_cache, td, td->td_dma);
127 }
128
129 /*-------------------------------------------------------------------------*/
130
131 /* EDs ... */
132 static struct ed *
133 ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
134 {
135         dma_addr_t      dma;
136         struct ed       *ed;
137         struct usb_hcd  *hcd = ohci_to_hcd(hc);
138
139         if (hcd->localmem_pool)
140                 ed = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*ed), &dma);
141         else
142                 ed = dma_pool_zalloc(hc->ed_cache, mem_flags, &dma);
143         if (ed) {
144                 INIT_LIST_HEAD (&ed->td_list);
145                 ed->dma = dma;
146         }
147         return ed;
148 }
149
150 static void
151 ed_free (struct ohci_hcd *hc, struct ed *ed)
152 {
153         struct usb_hcd  *hcd = ohci_to_hcd(hc);
154
155         if (hcd->localmem_pool)
156                 gen_pool_free(hcd->localmem_pool, (unsigned long)ed,
157                               sizeof(*ed));
158         else
159                 dma_pool_free(hc->ed_cache, ed, ed->dma);
160 }
161