blob: 2c6965484fe8c69866dd6d7d73b73e15612ab463 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * DMA memory management for framework level HCD code (hc_driver)
3 *
4 * This implementation plugs in through generic "usb_bus" level methods,
5 * and should work with all USB controllers, regardles of bus type.
6 */
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/slab.h>
11#include <linux/device.h>
12#include <linux/mm.h>
13#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/dma-mapping.h>
15#include <linux/dmapool.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/usb.h>
Eric Lescouet27729aa2010-04-24 23:21:52 +020017#include <linux/usb/hcd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19
20/*
21 * DMA-Coherent Buffers
22 */
23
24/* FIXME tune these based on pool statistics ... */
25static const size_t pool_max [HCD_BUFFER_POOLS] = {
26 /* platforms without dma-friendly caches might need to
27 * prevent cacheline sharing...
28 */
29 32,
30 128,
31 512,
32 PAGE_SIZE / 2
33 /* bigger --> allocate pages */
34};
35
36
37/* SETUP primitives */
38
39/**
40 * hcd_buffer_create - initialize buffer pools
41 * @hcd: the bus whose buffer pools are to be initialized
42 * Context: !in_interrupt()
43 *
44 * Call this as part of initializing a host controller that uses the dma
45 * memory allocators. It initializes some pools of dma-coherent memory that
46 * will be shared by all drivers using that controller, or returns a negative
47 * errno value on error.
48 *
49 * Call hcd_buffer_destroy() to clean up after using those pools.
50 */
Oliver Neukum1a68f712007-01-25 11:17:41 +010051int hcd_buffer_create(struct usb_hcd *hcd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
Oliver Neukum1a68f712007-01-25 11:17:41 +010053 char name[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 int i, size;
55
Magnus Dammb3476672008-01-23 15:58:35 +090056 if (!hcd->self.controller->dma_mask &&
57 !(hcd->driver->flags & HCD_LOCAL_MEM))
Chris Humbertbd39b7f2005-11-28 09:29:23 -080058 return 0;
59
Greg Kroah-Hartman2c044a42008-01-30 15:21:33 -080060 for (i = 0; i < HCD_BUFFER_POOLS; i++) {
61 size = pool_max[i];
62 if (!size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 continue;
Oliver Neukum1a68f712007-01-25 11:17:41 +010064 snprintf(name, sizeof name, "buffer-%d", size);
65 hcd->pool[i] = dma_pool_create(name, hcd->self.controller,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 size, size, 0);
67 if (!hcd->pool [i]) {
Oliver Neukum1a68f712007-01-25 11:17:41 +010068 hcd_buffer_destroy(hcd);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return -ENOMEM;
70 }
71 }
72 return 0;
73}
74
75
76/**
77 * hcd_buffer_destroy - deallocate buffer pools
78 * @hcd: the bus whose buffer pools are to be destroyed
79 * Context: !in_interrupt()
80 *
81 * This frees the buffer pools created by hcd_buffer_create().
82 */
Oliver Neukum1a68f712007-01-25 11:17:41 +010083void hcd_buffer_destroy(struct usb_hcd *hcd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
Greg Kroah-Hartman2c044a42008-01-30 15:21:33 -080085 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Greg Kroah-Hartman2c044a42008-01-30 15:21:33 -080087 for (i = 0; i < HCD_BUFFER_POOLS; i++) {
88 struct dma_pool *pool = hcd->pool[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 if (pool) {
Oliver Neukum1a68f712007-01-25 11:17:41 +010090 dma_pool_destroy(pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 hcd->pool[i] = NULL;
92 }
93 }
94}
95
96
Christoph Lameter441e1432006-12-06 20:33:19 -080097/* sometimes alloc/free could use kmalloc with GFP_DMA, for
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 * better sharing and to leverage mm/slab.c intelligence.
99 */
100
Oliver Neukum1a68f712007-01-25 11:17:41 +0100101void *hcd_buffer_alloc(
102 struct usb_bus *bus,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 size_t size,
Al Viro55016f12005-10-21 03:21:58 -0400104 gfp_t mem_flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 dma_addr_t *dma
106)
107{
Alan Stern17200582006-08-30 11:32:52 -0400108 struct usb_hcd *hcd = bus_to_hcd(bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 int i;
110
111 /* some USB hosts just use PIO */
Magnus Dammb3476672008-01-23 15:58:35 +0900112 if (!bus->controller->dma_mask &&
113 !(hcd->driver->flags & HCD_LOCAL_MEM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 *dma = ~(dma_addr_t) 0;
Oliver Neukum1a68f712007-01-25 11:17:41 +0100115 return kmalloc(size, mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 }
117
118 for (i = 0; i < HCD_BUFFER_POOLS; i++) {
119 if (size <= pool_max [i])
Oliver Neukum1a68f712007-01-25 11:17:41 +0100120 return dma_pool_alloc(hcd->pool [i], mem_flags, dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
Johannes Berga8aa4012009-04-18 11:00:39 +0200122 return dma_alloc_coherent(hcd->self.controller, size, dma, mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
Oliver Neukum1a68f712007-01-25 11:17:41 +0100125void hcd_buffer_free(
126 struct usb_bus *bus,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 size_t size,
128 void *addr,
129 dma_addr_t dma
130)
131{
Alan Stern17200582006-08-30 11:32:52 -0400132 struct usb_hcd *hcd = bus_to_hcd(bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 int i;
134
135 if (!addr)
136 return;
137
Magnus Dammb3476672008-01-23 15:58:35 +0900138 if (!bus->controller->dma_mask &&
139 !(hcd->driver->flags & HCD_LOCAL_MEM)) {
Oliver Neukum1a68f712007-01-25 11:17:41 +0100140 kfree(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 return;
142 }
143
144 for (i = 0; i < HCD_BUFFER_POOLS; i++) {
145 if (size <= pool_max [i]) {
Oliver Neukum1a68f712007-01-25 11:17:41 +0100146 dma_pool_free(hcd->pool [i], addr, dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 return;
148 }
149 }
Oliver Neukum1a68f712007-01-25 11:17:41 +0100150 dma_free_coherent(hcd->self.controller, size, addr, dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}