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-rw-r--r--drivers/iommu/Kconfig10
-rw-r--r--drivers/iommu/Makefile1
-rw-r--r--drivers/iommu/omap-iommu-debug.c114
-rw-r--r--drivers/iommu/omap-iommu.c13
-rw-r--r--drivers/iommu/omap-iommu.h8
-rw-r--r--drivers/iommu/omap-iovmm.c791
-rw-r--r--include/linux/omap-iommu.h37
7 files changed, 8 insertions, 966 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index d260605e6d5f..154e5a838257 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -143,16 +143,12 @@ config OMAP_IOMMU
143 depends on ARCH_OMAP2PLUS 143 depends on ARCH_OMAP2PLUS
144 select IOMMU_API 144 select IOMMU_API
145 145
146config OMAP_IOVMM
147 tristate "OMAP IO Virtual Memory Manager Support"
148 depends on OMAP_IOMMU
149
150config OMAP_IOMMU_DEBUG 146config OMAP_IOMMU_DEBUG
151 tristate "Export OMAP IOMMU/IOVMM internals in DebugFS" 147 tristate "Export OMAP IOMMU internals in DebugFS"
152 depends on OMAP_IOVMM && DEBUG_FS 148 depends on OMAP_IOMMU && DEBUG_FS
153 help 149 help
154 Select this to see extensive information about 150 Select this to see extensive information about
155 the internal state of OMAP IOMMU/IOVMM in debugfs. 151 the internal state of OMAP IOMMU in debugfs.
156 152
157 Say N unless you know you need this. 153 Say N unless you know you need this.
158 154
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 8893bad048e0..6a4a00ef088b 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -11,7 +11,6 @@ obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
11obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o 11obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
12obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o 12obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o
13obj-$(CONFIG_OMAP_IOMMU) += omap-iommu2.o 13obj-$(CONFIG_OMAP_IOMMU) += omap-iommu2.o
14obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o
15obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o 14obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
16obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o 15obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
17obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o 16obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
index 80fffba7f12d..531658d17333 100644
--- a/drivers/iommu/omap-iommu-debug.c
+++ b/drivers/iommu/omap-iommu-debug.c
@@ -213,116 +213,6 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
213 return bytes; 213 return bytes;
214} 214}
215 215
216static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
217 size_t count, loff_t *ppos)
218{
219 struct device *dev = file->private_data;
220 struct omap_iommu *obj = dev_to_omap_iommu(dev);
221 char *p, *buf;
222 struct iovm_struct *tmp;
223 int uninitialized_var(i);
224 ssize_t bytes;
225
226 buf = (char *)__get_free_page(GFP_KERNEL);
227 if (!buf)
228 return -ENOMEM;
229 p = buf;
230
231 p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n",
232 "No", "start", "end", "size", "flags");
233 p += sprintf(p, "-------------------------------------------------\n");
234
235 mutex_lock(&iommu_debug_lock);
236
237 list_for_each_entry(tmp, &obj->mmap, list) {
238 size_t len;
239 const char *str = "%3d %08x-%08x %6x %8x\n";
240 const int maxcol = 39;
241
242 len = tmp->da_end - tmp->da_start;
243 p += snprintf(p, maxcol, str,
244 i, tmp->da_start, tmp->da_end, len, tmp->flags);
245
246 if (PAGE_SIZE - (p - buf) < maxcol)
247 break;
248 i++;
249 }
250
251 bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
252
253 mutex_unlock(&iommu_debug_lock);
254 free_page((unsigned long)buf);
255
256 return bytes;
257}
258
259static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
260 size_t count, loff_t *ppos)
261{
262 struct device *dev = file->private_data;
263 char *p, *buf;
264 struct iovm_struct *area;
265 ssize_t bytes;
266
267 count = min_t(ssize_t, count, PAGE_SIZE);
268
269 buf = (char *)__get_free_page(GFP_KERNEL);
270 if (!buf)
271 return -ENOMEM;
272 p = buf;
273
274 mutex_lock(&iommu_debug_lock);
275
276 area = omap_find_iovm_area(dev, (u32)ppos);
277 if (!area) {
278 bytes = -EINVAL;
279 goto err_out;
280 }
281 memcpy(p, area->va, count);
282 p += count;
283
284 bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
285err_out:
286 mutex_unlock(&iommu_debug_lock);
287 free_page((unsigned long)buf);
288
289 return bytes;
290}
291
292static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
293 size_t count, loff_t *ppos)
294{
295 struct device *dev = file->private_data;
296 struct iovm_struct *area;
297 char *p, *buf;
298
299 count = min_t(size_t, count, PAGE_SIZE);
300
301 buf = (char *)__get_free_page(GFP_KERNEL);
302 if (!buf)
303 return -ENOMEM;
304 p = buf;
305
306 mutex_lock(&iommu_debug_lock);
307
308 if (copy_from_user(p, userbuf, count)) {
309 count = -EFAULT;
310 goto err_out;
311 }
312
313 area = omap_find_iovm_area(dev, (u32)ppos);
314 if (!area) {
315 count = -EINVAL;
316 goto err_out;
317 }
318 memcpy(area->va, p, count);
319err_out:
320 mutex_unlock(&iommu_debug_lock);
321 free_page((unsigned long)buf);
322
323 return count;
324}
325
326#define DEBUG_FOPS(name) \ 216#define DEBUG_FOPS(name) \
327 static const struct file_operations debug_##name##_fops = { \ 217 static const struct file_operations debug_##name##_fops = { \
328 .open = simple_open, \ 218 .open = simple_open, \
@@ -342,8 +232,6 @@ DEBUG_FOPS_RO(ver);
342DEBUG_FOPS_RO(regs); 232DEBUG_FOPS_RO(regs);
343DEBUG_FOPS_RO(tlb); 233DEBUG_FOPS_RO(tlb);
344DEBUG_FOPS(pagetable); 234DEBUG_FOPS(pagetable);
345DEBUG_FOPS_RO(mmap);
346DEBUG_FOPS(mem);
347 235
348#define __DEBUG_ADD_FILE(attr, mode) \ 236#define __DEBUG_ADD_FILE(attr, mode) \
349 { \ 237 { \
@@ -389,8 +277,6 @@ static int iommu_debug_register(struct device *dev, void *data)
389 DEBUG_ADD_FILE_RO(regs); 277 DEBUG_ADD_FILE_RO(regs);
390 DEBUG_ADD_FILE_RO(tlb); 278 DEBUG_ADD_FILE_RO(tlb);
391 DEBUG_ADD_FILE(pagetable); 279 DEBUG_ADD_FILE(pagetable);
392 DEBUG_ADD_FILE_RO(mmap);
393 DEBUG_ADD_FILE(mem);
394 280
395 return 0; 281 return 0;
396 282
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 895af06a667f..61599e2b33ca 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -959,31 +959,18 @@ static int omap_iommu_probe(struct platform_device *pdev)
959 return err; 959 return err;
960 if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8) 960 if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8)
961 return -EINVAL; 961 return -EINVAL;
962 /*
963 * da_start and da_end are needed for omap-iovmm, so hardcode
964 * these values as used by OMAP3 ISP - the only user for
965 * omap-iovmm
966 */
967 obj->da_start = 0;
968 obj->da_end = 0xfffff000;
969 if (of_find_property(of, "ti,iommu-bus-err-back", NULL)) 962 if (of_find_property(of, "ti,iommu-bus-err-back", NULL))
970 obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN; 963 obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN;
971 } else { 964 } else {
972 obj->nr_tlb_entries = pdata->nr_tlb_entries; 965 obj->nr_tlb_entries = pdata->nr_tlb_entries;
973 obj->name = pdata->name; 966 obj->name = pdata->name;
974 obj->da_start = pdata->da_start;
975 obj->da_end = pdata->da_end;
976 } 967 }
977 if (obj->da_end <= obj->da_start)
978 return -EINVAL;
979 968
980 obj->dev = &pdev->dev; 969 obj->dev = &pdev->dev;
981 obj->ctx = (void *)obj + sizeof(*obj); 970 obj->ctx = (void *)obj + sizeof(*obj);
982 971
983 spin_lock_init(&obj->iommu_lock); 972 spin_lock_init(&obj->iommu_lock);
984 mutex_init(&obj->mmap_lock);
985 spin_lock_init(&obj->page_table_lock); 973 spin_lock_init(&obj->page_table_lock);
986 INIT_LIST_HEAD(&obj->mmap);
987 974
988 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 975 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
989 obj->regbase = devm_ioremap_resource(obj->dev, res); 976 obj->regbase = devm_ioremap_resource(obj->dev, res);
diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h
index ea920c3e94ff..1275a822934b 100644
--- a/drivers/iommu/omap-iommu.h
+++ b/drivers/iommu/omap-iommu.h
@@ -46,12 +46,7 @@ struct omap_iommu {
46 46
47 int nr_tlb_entries; 47 int nr_tlb_entries;
48 48
49 struct list_head mmap;
50 struct mutex mmap_lock; /* protect mmap */
51
52 void *ctx; /* iommu context: registres saved area */ 49 void *ctx; /* iommu context: registres saved area */
53 u32 da_start;
54 u32 da_end;
55 50
56 int has_bus_err_back; 51 int has_bus_err_back;
57}; 52};
@@ -154,9 +149,12 @@ static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
154#define MMU_RAM_PADDR_MASK \ 149#define MMU_RAM_PADDR_MASK \
155 ((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT) 150 ((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)
156 151
152#define MMU_RAM_ENDIAN_SHIFT 9
157#define MMU_RAM_ENDIAN_MASK (1 << MMU_RAM_ENDIAN_SHIFT) 153#define MMU_RAM_ENDIAN_MASK (1 << MMU_RAM_ENDIAN_SHIFT)
154#define MMU_RAM_ENDIAN_LITTLE (0 << MMU_RAM_ENDIAN_SHIFT)
158#define MMU_RAM_ENDIAN_BIG (1 << MMU_RAM_ENDIAN_SHIFT) 155#define MMU_RAM_ENDIAN_BIG (1 << MMU_RAM_ENDIAN_SHIFT)
159 156
157#define MMU_RAM_ELSZ_SHIFT 7
160#define MMU_RAM_ELSZ_MASK (3 << MMU_RAM_ELSZ_SHIFT) 158#define MMU_RAM_ELSZ_MASK (3 << MMU_RAM_ELSZ_SHIFT)
161#define MMU_RAM_ELSZ_8 (0 << MMU_RAM_ELSZ_SHIFT) 159#define MMU_RAM_ELSZ_8 (0 << MMU_RAM_ELSZ_SHIFT)
162#define MMU_RAM_ELSZ_16 (1 << MMU_RAM_ELSZ_SHIFT) 160#define MMU_RAM_ELSZ_16 (1 << MMU_RAM_ELSZ_SHIFT)
diff --git a/drivers/iommu/omap-iovmm.c b/drivers/iommu/omap-iovmm.c
deleted file mode 100644
index f583ba049168..000000000000
--- a/drivers/iommu/omap-iovmm.c
+++ /dev/null
@@ -1,791 +0,0 @@
1/*
2 * omap iommu: simple virtual address space management
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/err.h>
15#include <linux/slab.h>
16#include <linux/vmalloc.h>
17#include <linux/device.h>
18#include <linux/scatterlist.h>
19#include <linux/iommu.h>
20#include <linux/omap-iommu.h>
21#include <linux/platform_data/iommu-omap.h>
22
23#include <asm/cacheflush.h>
24#include <asm/mach/map.h>
25
26#include "omap-iopgtable.h"
27#include "omap-iommu.h"
28
29/*
30 * IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
31 *
32 * lower 16 bit is used for h/w and upper 16 bit is for s/w.
33 */
34#define IOVMF_SW_SHIFT 16
35
36/*
37 * iovma: h/w flags derived from cam and ram attribute
38 */
39#define IOVMF_CAM_MASK (~((1 << 10) - 1))
40#define IOVMF_RAM_MASK (~IOVMF_CAM_MASK)
41
42#define IOVMF_PGSZ_MASK (3 << 0)
43#define IOVMF_PGSZ_1M MMU_CAM_PGSZ_1M
44#define IOVMF_PGSZ_64K MMU_CAM_PGSZ_64K
45#define IOVMF_PGSZ_4K MMU_CAM_PGSZ_4K
46#define IOVMF_PGSZ_16M MMU_CAM_PGSZ_16M
47
48#define IOVMF_ENDIAN_MASK (1 << 9)
49#define IOVMF_ENDIAN_BIG MMU_RAM_ENDIAN_BIG
50
51#define IOVMF_ELSZ_MASK (3 << 7)
52#define IOVMF_ELSZ_16 MMU_RAM_ELSZ_16
53#define IOVMF_ELSZ_32 MMU_RAM_ELSZ_32
54#define IOVMF_ELSZ_NONE MMU_RAM_ELSZ_NONE
55
56#define IOVMF_MIXED_MASK (1 << 6)
57#define IOVMF_MIXED MMU_RAM_MIXED
58
59/*
60 * iovma: s/w flags, used for mapping and umapping internally.
61 */
62#define IOVMF_MMIO (1 << IOVMF_SW_SHIFT)
63#define IOVMF_ALLOC (2 << IOVMF_SW_SHIFT)
64#define IOVMF_ALLOC_MASK (3 << IOVMF_SW_SHIFT)
65
66/* "superpages" is supported just with physically linear pages */
67#define IOVMF_DISCONT (1 << (2 + IOVMF_SW_SHIFT))
68#define IOVMF_LINEAR (2 << (2 + IOVMF_SW_SHIFT))
69#define IOVMF_LINEAR_MASK (3 << (2 + IOVMF_SW_SHIFT))
70
71#define IOVMF_DA_FIXED (1 << (4 + IOVMF_SW_SHIFT))
72
73static struct kmem_cache *iovm_area_cachep;
74
75/* return the offset of the first scatterlist entry in a sg table */
76static unsigned int sgtable_offset(const struct sg_table *sgt)
77{
78 if (!sgt || !sgt->nents)
79 return 0;
80
81 return sgt->sgl->offset;
82}
83
84/* return total bytes of sg buffers */
85static size_t sgtable_len(const struct sg_table *sgt)
86{
87 unsigned int i, total = 0;
88 struct scatterlist *sg;
89
90 if (!sgt)
91 return 0;
92
93 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
94 size_t bytes;
95
96 bytes = sg->length + sg->offset;
97
98 if (!iopgsz_ok(bytes)) {
99 pr_err("%s: sg[%d] not iommu pagesize(%u %u)\n",
100 __func__, i, bytes, sg->offset);
101 return 0;
102 }
103
104 if (i && sg->offset) {
105 pr_err("%s: sg[%d] offset not allowed in internal entries\n",
106 __func__, i);
107 return 0;
108 }
109
110 total += bytes;
111 }
112
113 return total;
114}
115#define sgtable_ok(x) (!!sgtable_len(x))
116
117static unsigned max_alignment(u32 addr)
118{
119 int i;
120 unsigned pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
121 for (i = 0; i < ARRAY_SIZE(pagesize) && addr & (pagesize[i] - 1); i++)
122 ;
123 return (i < ARRAY_SIZE(pagesize)) ? pagesize[i] : 0;
124}
125
126/*
127 * calculate the optimal number sg elements from total bytes based on
128 * iommu superpages
129 */
130static unsigned sgtable_nents(size_t bytes, u32 da, u32 pa)
131{
132 unsigned nr_entries = 0, ent_sz;
133
134 if (!PAGE_ALIGNED(bytes)) {
135 pr_err("%s: wrong size %08x\n", __func__, bytes);
136 return 0;
137 }
138
139 while (bytes) {
140 ent_sz = max_alignment(da | pa);
141 ent_sz = min_t(unsigned, ent_sz, iopgsz_max(bytes));
142 nr_entries++;
143 da += ent_sz;
144 pa += ent_sz;
145 bytes -= ent_sz;
146 }
147
148 return nr_entries;
149}
150
151/* allocate and initialize sg_table header(a kind of 'superblock') */
152static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags,
153 u32 da, u32 pa)
154{
155 unsigned int nr_entries;
156 int err;
157 struct sg_table *sgt;
158
159 if (!bytes)
160 return ERR_PTR(-EINVAL);
161
162 if (!PAGE_ALIGNED(bytes))
163 return ERR_PTR(-EINVAL);
164
165 if (flags & IOVMF_LINEAR) {
166 nr_entries = sgtable_nents(bytes, da, pa);
167 if (!nr_entries)
168 return ERR_PTR(-EINVAL);
169 } else
170 nr_entries = bytes / PAGE_SIZE;
171
172 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
173 if (!sgt)
174 return ERR_PTR(-ENOMEM);
175
176 err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL);
177 if (err) {
178 kfree(sgt);
179 return ERR_PTR(err);
180 }
181
182 pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries);
183
184 return sgt;
185}
186
187/* free sg_table header(a kind of superblock) */
188static void sgtable_free(struct sg_table *sgt)
189{
190 if (!sgt)
191 return;
192
193 sg_free_table(sgt);
194 kfree(sgt);
195
196 pr_debug("%s: sgt:%p\n", __func__, sgt);
197}
198
199/* map 'sglist' to a contiguous mpu virtual area and return 'va' */
200static void *vmap_sg(const struct sg_table *sgt)
201{
202 u32 va;
203 size_t total;
204 unsigned int i;
205 struct scatterlist *sg;
206 struct vm_struct *new;
207 const struct mem_type *mtype;
208
209 mtype = get_mem_type(MT_DEVICE);
210 if (!mtype)
211 return ERR_PTR(-EINVAL);
212
213 total = sgtable_len(sgt);
214 if (!total)
215 return ERR_PTR(-EINVAL);
216
217 new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END);
218 if (!new)
219 return ERR_PTR(-ENOMEM);
220 va = (u32)new->addr;
221
222 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
223 size_t bytes;
224 u32 pa;
225 int err;
226
227 pa = sg_phys(sg) - sg->offset;
228 bytes = sg->length + sg->offset;
229
230 BUG_ON(bytes != PAGE_SIZE);
231
232 err = ioremap_page(va, pa, mtype);
233 if (err)
234 goto err_out;
235
236 va += bytes;
237 }
238
239 flush_cache_vmap((unsigned long)new->addr,
240 (unsigned long)(new->addr + total));
241 return new->addr;
242
243err_out:
244 WARN_ON(1); /* FIXME: cleanup some mpu mappings */
245 vunmap(new->addr);
246 return ERR_PTR(-EAGAIN);
247}
248
249static inline void vunmap_sg(const void *va)
250{
251 vunmap(va);
252}
253
254static struct iovm_struct *__find_iovm_area(struct omap_iommu *obj,
255 const u32 da)
256{
257 struct iovm_struct *tmp;
258
259 list_for_each_entry(tmp, &obj->mmap, list) {
260 if ((da >= tmp->da_start) && (da < tmp->da_end)) {
261 size_t len;
262
263 len = tmp->da_end - tmp->da_start;
264
265 dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n",
266 __func__, tmp->da_start, da, tmp->da_end, len,
267 tmp->flags);
268
269 return tmp;
270 }
271 }
272
273 return NULL;
274}
275
276/**
277 * omap_find_iovm_area - find iovma which includes @da
278 * @dev: client device
279 * @da: iommu device virtual address
280 *
281 * Find the existing iovma starting at @da
282 */
283struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da)
284{
285 struct omap_iommu *obj = dev_to_omap_iommu(dev);
286 struct iovm_struct *area;
287
288 mutex_lock(&obj->mmap_lock);
289 area = __find_iovm_area(obj, da);
290 mutex_unlock(&obj->mmap_lock);
291
292 return area;
293}
294EXPORT_SYMBOL_GPL(omap_find_iovm_area);
295
296/*
297 * This finds the hole(area) which fits the requested address and len
298 * in iovmas mmap, and returns the new allocated iovma.
299 */
300static struct iovm_struct *alloc_iovm_area(struct omap_iommu *obj, u32 da,
301 size_t bytes, u32 flags)
302{
303 struct iovm_struct *new, *tmp;
304 u32 start, prev_end, alignment;
305
306 if (!obj || !bytes)
307 return ERR_PTR(-EINVAL);
308
309 start = da;
310 alignment = PAGE_SIZE;
311
312 if (~flags & IOVMF_DA_FIXED) {
313 /* Don't map address 0 */
314 start = obj->da_start ? obj->da_start : alignment;
315
316 if (flags & IOVMF_LINEAR)
317 alignment = iopgsz_max(bytes);
318 start = roundup(start, alignment);
319 } else if (start < obj->da_start || start > obj->da_end ||
320 obj->da_end - start < bytes) {
321 return ERR_PTR(-EINVAL);
322 }
323
324 tmp = NULL;
325 if (list_empty(&obj->mmap))
326 goto found;
327
328 prev_end = 0;
329 list_for_each_entry(tmp, &obj->mmap, list) {
330
331 if (prev_end > start)
332 break;
333
334 if (tmp->da_start > start && (tmp->da_start - start) >= bytes)
335 goto found;
336
337 if (tmp->da_end >= start && ~flags & IOVMF_DA_FIXED)
338 start = roundup(tmp->da_end + 1, alignment);
339
340 prev_end = tmp->da_end;
341 }
342
343 if ((start >= prev_end) && (obj->da_end - start >= bytes))
344 goto found;
345
346 dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n",
347 __func__, da, bytes, flags);
348
349 return ERR_PTR(-EINVAL);
350
351found:
352 new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL);
353 if (!new)
354 return ERR_PTR(-ENOMEM);
355
356 new->iommu = obj;
357 new->da_start = start;
358 new->da_end = start + bytes;
359 new->flags = flags;
360
361 /*
362 * keep ascending order of iovmas
363 */
364 if (tmp)
365 list_add_tail(&new->list, &tmp->list);
366 else
367 list_add(&new->list, &obj->mmap);
368
369 dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n",
370 __func__, new->da_start, start, new->da_end, bytes, flags);
371
372 return new;
373}
374
375static void free_iovm_area(struct omap_iommu *obj, struct iovm_struct *area)
376{
377 size_t bytes;
378
379 BUG_ON(!obj || !area);
380
381 bytes = area->da_end - area->da_start;
382
383 dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n",
384 __func__, area->da_start, area->da_end, bytes, area->flags);
385
386 list_del(&area->list);
387 kmem_cache_free(iovm_area_cachep, area);
388}
389
390/**
391 * omap_da_to_va - convert (d) to (v)
392 * @dev: client device
393 * @da: iommu device virtual address
394 * @va: mpu virtual address
395 *
396 * Returns mpu virtual addr which corresponds to a given device virtual addr
397 */
398void *omap_da_to_va(struct device *dev, u32 da)
399{
400 struct omap_iommu *obj = dev_to_omap_iommu(dev);
401 void *va = NULL;
402 struct iovm_struct *area;
403
404 mutex_lock(&obj->mmap_lock);
405
406 area = __find_iovm_area(obj, da);
407 if (!area) {
408 dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
409 goto out;
410 }
411 va = area->va;
412out:
413 mutex_unlock(&obj->mmap_lock);
414
415 return va;
416}
417EXPORT_SYMBOL_GPL(omap_da_to_va);
418
419static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va)
420{
421 unsigned int i;
422 struct scatterlist *sg;
423 void *va = _va;
424 void *va_end;
425
426 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
427 struct page *pg;
428 const size_t bytes = PAGE_SIZE;
429
430 /*
431 * iommu 'superpage' isn't supported with 'omap_iommu_vmalloc()'
432 */
433 pg = vmalloc_to_page(va);
434 BUG_ON(!pg);
435 sg_set_page(sg, pg, bytes, 0);
436
437 va += bytes;
438 }
439
440 va_end = _va + PAGE_SIZE * i;
441}
442
443static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
444{
445 /*
446 * Actually this is not necessary at all, just exists for
447 * consistency of the code readability.
448 */
449 BUG_ON(!sgt);
450}
451
452/* create 'da' <-> 'pa' mapping from 'sgt' */
453static int map_iovm_area(struct iommu_domain *domain, struct iovm_struct *new,
454 const struct sg_table *sgt, u32 flags)
455{
456 int err;
457 unsigned int i, j;
458 struct scatterlist *sg;
459 u32 da = new->da_start;
460
461 if (!domain || !sgt)
462 return -EINVAL;
463
464 BUG_ON(!sgtable_ok(sgt));
465
466 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
467 u32 pa;
468 size_t bytes;
469
470 pa = sg_phys(sg) - sg->offset;
471 bytes = sg->length + sg->offset;
472
473 flags &= ~IOVMF_PGSZ_MASK;
474
475 if (bytes_to_iopgsz(bytes) < 0)
476 goto err_out;
477
478 pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
479 i, da, pa, bytes);
480
481 err = iommu_map(domain, da, pa, bytes, flags);
482 if (err)
483 goto err_out;
484
485 da += bytes;
486 }
487 return 0;
488
489err_out:
490 da = new->da_start;
491
492 for_each_sg(sgt->sgl, sg, i, j) {
493 size_t bytes;
494
495 bytes = sg->length + sg->offset;
496
497 /* ignore failures.. we're already handling one */
498 iommu_unmap(domain, da, bytes);
499
500 da += bytes;
501 }
502 return err;
503}
504
505/* release 'da' <-> 'pa' mapping */
506static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj,
507 struct iovm_struct *area)
508{
509 u32 start;
510 size_t total = area->da_end - area->da_start;
511 const struct sg_table *sgt = area->sgt;
512 struct scatterlist *sg;
513 int i;
514 size_t unmapped;
515
516 BUG_ON(!sgtable_ok(sgt));
517 BUG_ON((!total) || !PAGE_ALIGNED(total));
518
519 start = area->da_start;
520 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
521 size_t bytes;
522
523 bytes = sg->length + sg->offset;
524
525 unmapped = iommu_unmap(domain, start, bytes);
526 if (unmapped < bytes)
527 break;
528
529 dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n",
530 __func__, start, bytes, area->flags);
531
532 BUG_ON(!PAGE_ALIGNED(bytes));
533
534 total -= bytes;
535 start += bytes;
536 }
537 BUG_ON(total);
538}
539
540/* template function for all unmapping */
541static struct sg_table *unmap_vm_area(struct iommu_domain *domain,
542 struct omap_iommu *obj, const u32 da,
543 void (*fn)(const void *), u32 flags)
544{
545 struct sg_table *sgt = NULL;
546 struct iovm_struct *area;
547
548 if (!PAGE_ALIGNED(da)) {
549 dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da);
550 return NULL;
551 }
552
553 mutex_lock(&obj->mmap_lock);
554
555 area = __find_iovm_area(obj, da);
556 if (!area) {
557 dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
558 goto out;
559 }
560
561 if ((area->flags & flags) != flags) {
562 dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__,
563 area->flags);
564 goto out;
565 }
566 sgt = (struct sg_table *)area->sgt;
567
568 unmap_iovm_area(domain, obj, area);
569
570 fn(area->va);
571
572 dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__,
573 area->da_start, da, area->da_end,
574 area->da_end - area->da_start, area->flags);
575
576 free_iovm_area(obj, area);
577out:
578 mutex_unlock(&obj->mmap_lock);
579
580 return sgt;
581}
582
583static u32 map_iommu_region(struct iommu_domain *domain, struct omap_iommu *obj,
584 u32 da, const struct sg_table *sgt, void *va,
585 size_t bytes, u32 flags)
586{
587 int err = -ENOMEM;
588 struct iovm_struct *new;
589
590 mutex_lock(&obj->mmap_lock);
591
592 new = alloc_iovm_area(obj, da, bytes, flags);
593 if (IS_ERR(new)) {
594 err = PTR_ERR(new);
595 goto err_alloc_iovma;
596 }
597 new->va = va;
598 new->sgt = sgt;
599
600 if (map_iovm_area(domain, new, sgt, new->flags))
601 goto err_map;
602
603 mutex_unlock(&obj->mmap_lock);
604
605 dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n",
606 __func__, new->da_start, bytes, new->flags, va);
607
608 return new->da_start;
609
610err_map:
611 free_iovm_area(obj, new);
612err_alloc_iovma:
613 mutex_unlock(&obj->mmap_lock);
614 return err;
615}
616
617static inline u32
618__iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj,
619 u32 da, const struct sg_table *sgt,
620 void *va, size_t bytes, u32 flags)
621{
622 return map_iommu_region(domain, obj, da, sgt, va, bytes, flags);
623}
624
625/**
626 * omap_iommu_vmap - (d)-(p)-(v) address mapper
627 * @domain: iommu domain
628 * @dev: client device
629 * @sgt: address of scatter gather table
630 * @flags: iovma and page property
631 *
632 * Creates 1-n-1 mapping with given @sgt and returns @da.
633 * All @sgt element must be io page size aligned.
634 */
635u32 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
636 const struct sg_table *sgt, u32 flags)
637{
638 struct omap_iommu *obj = dev_to_omap_iommu(dev);
639 size_t bytes;
640 void *va = NULL;
641
642 if (!obj || !obj->dev || !sgt)
643 return -EINVAL;
644
645 bytes = sgtable_len(sgt);
646 if (!bytes)
647 return -EINVAL;
648 bytes = PAGE_ALIGN(bytes);
649
650 if (flags & IOVMF_MMIO) {
651 va = vmap_sg(sgt);
652 if (IS_ERR(va))
653 return PTR_ERR(va);
654 }
655
656 flags |= IOVMF_DISCONT;
657 flags |= IOVMF_MMIO;
658
659 da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags);
660 if (IS_ERR_VALUE(da))
661 vunmap_sg(va);
662
663 return da + sgtable_offset(sgt);
664}
665EXPORT_SYMBOL_GPL(omap_iommu_vmap);
666
667/**
668 * omap_iommu_vunmap - release virtual mapping obtained by 'omap_iommu_vmap()'
669 * @domain: iommu domain
670 * @dev: client device
671 * @da: iommu device virtual address
672 *
673 * Free the iommu virtually contiguous memory area starting at
674 * @da, which was returned by 'omap_iommu_vmap()'.
675 */
676struct sg_table *
677omap_iommu_vunmap(struct iommu_domain *domain, struct device *dev, u32 da)
678{
679 struct omap_iommu *obj = dev_to_omap_iommu(dev);
680 struct sg_table *sgt;
681 /*
682 * 'sgt' is allocated before 'omap_iommu_vmalloc()' is called.
683 * Just returns 'sgt' to the caller to free
684 */
685 da &= PAGE_MASK;
686 sgt = unmap_vm_area(domain, obj, da, vunmap_sg,
687 IOVMF_DISCONT | IOVMF_MMIO);
688 if (!sgt)
689 dev_dbg(obj->dev, "%s: No sgt\n", __func__);
690 return sgt;
691}
692EXPORT_SYMBOL_GPL(omap_iommu_vunmap);
693
694/**
695 * omap_iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
696 * @dev: client device
697 * @da: contiguous iommu virtual memory
698 * @bytes: allocation size
699 * @flags: iovma and page property
700 *
701 * Allocate @bytes linearly and creates 1-n-1 mapping and returns
702 * @da again, which might be adjusted if 'IOVMF_DA_FIXED' is not set.
703 */
704u32
705omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev, u32 da,
706 size_t bytes, u32 flags)
707{
708 struct omap_iommu *obj = dev_to_omap_iommu(dev);
709 void *va;
710 struct sg_table *sgt;
711
712 if (!obj || !obj->dev || !bytes)
713 return -EINVAL;
714
715 bytes = PAGE_ALIGN(bytes);
716
717 va = vmalloc(bytes);
718 if (!va)
719 return -ENOMEM;
720
721 flags |= IOVMF_DISCONT;
722 flags |= IOVMF_ALLOC;
723
724 sgt = sgtable_alloc(bytes, flags, da, 0);
725 if (IS_ERR(sgt)) {
726 da = PTR_ERR(sgt);
727 goto err_sgt_alloc;
728 }
729 sgtable_fill_vmalloc(sgt, va);
730
731 da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags);
732 if (IS_ERR_VALUE(da))
733 goto err_iommu_vmap;
734
735 return da;
736
737err_iommu_vmap:
738 sgtable_drain_vmalloc(sgt);
739 sgtable_free(sgt);
740err_sgt_alloc:
741 vfree(va);
742 return da;
743}
744EXPORT_SYMBOL_GPL(omap_iommu_vmalloc);
745
746/**
747 * omap_iommu_vfree - release memory allocated by 'omap_iommu_vmalloc()'
748 * @dev: client device
749 * @da: iommu device virtual address
750 *
751 * Frees the iommu virtually continuous memory area starting at
752 * @da, as obtained from 'omap_iommu_vmalloc()'.
753 */
754void omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
755 const u32 da)
756{
757 struct omap_iommu *obj = dev_to_omap_iommu(dev);
758 struct sg_table *sgt;
759
760 sgt = unmap_vm_area(domain, obj, da, vfree,
761 IOVMF_DISCONT | IOVMF_ALLOC);
762 if (!sgt)
763 dev_dbg(obj->dev, "%s: No sgt\n", __func__);
764 sgtable_free(sgt);
765}
766EXPORT_SYMBOL_GPL(omap_iommu_vfree);
767
768static int __init iovmm_init(void)
769{
770 const unsigned long flags = SLAB_HWCACHE_ALIGN;
771 struct kmem_cache *p;
772
773 p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0,
774 flags, NULL);
775 if (!p)
776 return -ENOMEM;
777 iovm_area_cachep = p;
778
779 return 0;
780}
781module_init(iovmm_init);
782
783static void __exit iovmm_exit(void)
784{
785 kmem_cache_destroy(iovm_area_cachep);
786}
787module_exit(iovmm_exit);
788
789MODULE_DESCRIPTION("omap iommu: simple virtual address space management");
790MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
791MODULE_LICENSE("GPL v2");
diff --git a/include/linux/omap-iommu.h b/include/linux/omap-iommu.h
index cac78de09c07..c1aede46718b 100644
--- a/include/linux/omap-iommu.h
+++ b/include/linux/omap-iommu.h
@@ -10,41 +10,8 @@
10 * published by the Free Software Foundation. 10 * published by the Free Software Foundation.
11 */ 11 */
12 12
13#ifndef _INTEL_IOMMU_H_ 13#ifndef _OMAP_IOMMU_H_
14#define _INTEL_IOMMU_H_ 14#define _OMAP_IOMMU_H_
15
16struct iovm_struct {
17 struct omap_iommu *iommu; /* iommu object which this belongs to */
18 u32 da_start; /* area definition */
19 u32 da_end;
20 u32 flags; /* IOVMF_: see below */
21 struct list_head list; /* linked in ascending order */
22 const struct sg_table *sgt; /* keep 'page' <-> 'da' mapping */
23 void *va; /* mpu side mapped address */
24};
25
26#define MMU_RAM_ENDIAN_SHIFT 9
27#define MMU_RAM_ENDIAN_LITTLE (0 << MMU_RAM_ENDIAN_SHIFT)
28#define MMU_RAM_ELSZ_8 (0 << MMU_RAM_ELSZ_SHIFT)
29#define IOVMF_ENDIAN_LITTLE MMU_RAM_ENDIAN_LITTLE
30#define MMU_RAM_ELSZ_SHIFT 7
31#define IOVMF_ELSZ_8 MMU_RAM_ELSZ_8
32
33struct iommu_domain;
34
35extern struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da);
36extern u32
37omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
38 const struct sg_table *sgt, u32 flags);
39extern struct sg_table *omap_iommu_vunmap(struct iommu_domain *domain,
40 struct device *dev, u32 da);
41extern u32
42omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev,
43 u32 da, size_t bytes, u32 flags);
44extern void
45omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
46 const u32 da);
47extern void *omap_da_to_va(struct device *dev, u32 da);
48 15
49extern void omap_iommu_save_ctx(struct device *dev); 16extern void omap_iommu_save_ctx(struct device *dev);
50extern void omap_iommu_restore_ctx(struct device *dev); 17extern void omap_iommu_restore_ctx(struct device *dev);
generated by cgit v1.2.2 (git 2.25.0) at 2025-05-20 10:52:54 -0400