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authorRichard Purdie <rpurdie@linux.intel.com>2010-08-27 15:14:24 +0100
committerRichard Purdie <rpurdie@linux.intel.com>2010-08-27 15:29:45 +0100
commit29d6678fd546377459ef75cf54abeef5b969b5cf (patch)
tree8edd65790e37a00d01c3f203f773fe4b5012db18 /meta/recipes-kernel/linux/linux-omap-2.6.29/isp/iommu/0004-omap-iommu-simple-virtual-address-space-management.patch
parentda49de6885ee1bc424e70bc02f21f6ab920efb55 (diff)
downloadpoky-29d6678fd546377459ef75cf54abeef5b969b5cf.tar.gz
Major layout change to the packages directory
Having one monolithic packages directory makes it hard to find things and is generally overwhelming. This commit splits it into several logical sections roughly based on function, recipes.txt gives more information about the classifications used. The opportunity is also used to switch from "packages" to "recipes" as used in OpenEmbedded as the term "packages" can be confusing to people and has many different meanings. Not all recipes have been classified yet, this is just a first pass at separating things out. Some packages are moved to meta-extras as they're no longer actively used or maintained. Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap-2.6.29/isp/iommu/0004-omap-iommu-simple-virtual-address-space-management.patch')
-rw-r--r--meta/recipes-kernel/linux/linux-omap-2.6.29/isp/iommu/0004-omap-iommu-simple-virtual-address-space-management.patch1083
1 files changed, 1083 insertions, 0 deletions
diff --git a/meta/recipes-kernel/linux/linux-omap-2.6.29/isp/iommu/0004-omap-iommu-simple-virtual-address-space-management.patch b/meta/recipes-kernel/linux/linux-omap-2.6.29/isp/iommu/0004-omap-iommu-simple-virtual-address-space-management.patch
new file mode 100644
index 0000000000..945778b943
--- /dev/null
+++ b/meta/recipes-kernel/linux/linux-omap-2.6.29/isp/iommu/0004-omap-iommu-simple-virtual-address-space-management.patch
@@ -0,0 +1,1083 @@
1From 07365182b998af3dc2b79e822b8e21a3f50262c4 Mon Sep 17 00:00:00 2001
2From: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
3Date: Wed, 28 Jan 2009 21:32:08 +0200
4Subject: [PATCH] omap iommu: simple virtual address space management
5
6This patch provides a device drivers, which has a omap iommu, with
7address mapping APIs between device virtual address(iommu), physical
8address and MPU virtual address.
9
10There are 4 possible patterns for iommu virtual address(iova/da) mapping.
11
12 |iova/ mapping iommu_ page
13 | da pa va (d)-(p)-(v) function type
14 ---------------------------------------------------------------------------
15 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s
16 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s
17 3 | c d c 1 - n - 1 _vmap() / _vunmap() s
18 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n*
19
20 'iova': device iommu virtual address
21 'da': alias of 'iova'
22 'pa': physical address
23 'va': mpu virtual address
24
25 'c': contiguous memory area
26 'd': dicontiguous memory area
27 'a': anonymous memory allocation
28 '()': optional feature
29
30 'n': a normal page(4KB) size is used.
31 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used.
32
33 '*': not yet, but feasible.
34
35Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
36---
37 arch/arm/include/asm/io.h | 6 +
38 arch/arm/mm/ioremap.c | 11 +
39 arch/arm/plat-omap/include/mach/iovmm.h | 94 ++++
40 arch/arm/plat-omap/iovmm.c | 891 +++++++++++++++++++++++++++++++
41 4 files changed, 1002 insertions(+), 0 deletions(-)
42 create mode 100644 arch/arm/plat-omap/include/mach/iovmm.h
43 create mode 100644 arch/arm/plat-omap/iovmm.c
44
45diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
46index d2a59cf..cbdadfe 100644
47--- a/arch/arm/include/asm/io.h
48+++ b/arch/arm/include/asm/io.h
49@@ -75,6 +75,12 @@ extern void __iomem * __arm_ioremap(unsigned long, size_t, unsigned int);
50 extern void __iounmap(volatile void __iomem *addr);
51
52 /*
53+ * external interface to remap single page with appropriate type
54+ */
55+extern int ioremap_page(unsigned long virt, unsigned long phys,
56+ unsigned int mtype);
57+
58+/*
59 * Bad read/write accesses...
60 */
61 extern void __readwrite_bug(const char *fn);
62diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
63index 9f88dd3..8441351 100644
64--- a/arch/arm/mm/ioremap.c
65+++ b/arch/arm/mm/ioremap.c
66@@ -110,6 +110,17 @@ static int remap_area_pages(unsigned long start, unsigned long pfn,
67 return err;
68 }
69
70+int ioremap_page(unsigned long virt, unsigned long phys, unsigned int mtype)
71+{
72+ const struct mem_type *type;
73+
74+ type = get_mem_type(mtype);
75+ if (!type)
76+ return -EINVAL;
77+
78+ return remap_area_pages(virt, __phys_to_pfn(phys), PAGE_SIZE, type);
79+}
80+EXPORT_SYMBOL(ioremap_page);
81
82 void __check_kvm_seq(struct mm_struct *mm)
83 {
84diff --git a/arch/arm/plat-omap/include/mach/iovmm.h b/arch/arm/plat-omap/include/mach/iovmm.h
85new file mode 100644
86index 0000000..bdc7ce5
87--- /dev/null
88+++ b/arch/arm/plat-omap/include/mach/iovmm.h
89@@ -0,0 +1,94 @@
90+/*
91+ * omap iommu: simple virtual address space management
92+ *
93+ * Copyright (C) 2008-2009 Nokia Corporation
94+ *
95+ * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
96+ *
97+ * This program is free software; you can redistribute it and/or modify
98+ * it under the terms of the GNU General Public License version 2 as
99+ * published by the Free Software Foundation.
100+ */
101+
102+#ifndef __IOMMU_MMAP_H
103+#define __IOMMU_MMAP_H
104+
105+struct iovm_struct {
106+ struct iommu *iommu; /* iommu object which this belongs to */
107+ u32 da_start; /* area definition */
108+ u32 da_end;
109+ u32 flags; /* IOVMF_: see below */
110+ struct list_head list; /* linked in ascending order */
111+ const struct sg_table *sgt; /* keep 'page' <-> 'da' mapping */
112+ void *va; /* mpu side mapped address */
113+};
114+
115+/*
116+ * IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
117+ *
118+ * lower 16 bit is used for h/w and upper 16 bit is for s/w.
119+ */
120+#define IOVMF_SW_SHIFT 16
121+#define IOVMF_HW_SIZE (1 << IOVMF_SW_SHIFT)
122+#define IOVMF_HW_MASK (IOVMF_HW_SIZE - 1)
123+#define IOVMF_SW_MASK (~IOVMF_HW_MASK)UL
124+
125+/*
126+ * iovma: h/w flags derived from cam and ram attribute
127+ */
128+#define IOVMF_CAM_MASK (~((1 << 10) - 1))
129+#define IOVMF_RAM_MASK (~IOVMF_CAM_MASK)
130+
131+#define IOVMF_PGSZ_MASK (3 << 0)
132+#define IOVMF_PGSZ_1M MMU_CAM_PGSZ_1M
133+#define IOVMF_PGSZ_64K MMU_CAM_PGSZ_64K
134+#define IOVMF_PGSZ_4K MMU_CAM_PGSZ_4K
135+#define IOVMF_PGSZ_16M MMU_CAM_PGSZ_16M
136+
137+#define IOVMF_ENDIAN_MASK (1 << 9)
138+#define IOVMF_ENDIAN_BIG MMU_RAM_ENDIAN_BIG
139+#define IOVMF_ENDIAN_LITTLE MMU_RAM_ENDIAN_LITTLE
140+
141+#define IOVMF_ELSZ_MASK (3 << 7)
142+#define IOVMF_ELSZ_8 MMU_RAM_ELSZ_8
143+#define IOVMF_ELSZ_16 MMU_RAM_ELSZ_16
144+#define IOVMF_ELSZ_32 MMU_RAM_ELSZ_32
145+#define IOVMF_ELSZ_NONE MMU_RAM_ELSZ_NONE
146+
147+#define IOVMF_MIXED_MASK (1 << 6)
148+#define IOVMF_MIXED MMU_RAM_MIXED
149+
150+/*
151+ * iovma: s/w flags, used for mapping and umapping internally.
152+ */
153+#define IOVMF_MMIO (1 << IOVMF_SW_SHIFT)
154+#define IOVMF_ALLOC (2 << IOVMF_SW_SHIFT)
155+#define IOVMF_ALLOC_MASK (3 << IOVMF_SW_SHIFT)
156+
157+/* "superpages" is supported just with physically linear pages */
158+#define IOVMF_DISCONT (1 << (2 + IOVMF_SW_SHIFT))
159+#define IOVMF_LINEAR (2 << (2 + IOVMF_SW_SHIFT))
160+#define IOVMF_LINEAR_MASK (3 << (2 + IOVMF_SW_SHIFT))
161+
162+#define IOVMF_DA_FIXED (1 << (4 + IOVMF_SW_SHIFT))
163+#define IOVMF_DA_ANON (2 << (4 + IOVMF_SW_SHIFT))
164+#define IOVMF_DA_MASK (3 << (4 + IOVMF_SW_SHIFT))
165+
166+
167+extern struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da);
168+extern u32 iommu_vmap(struct iommu *obj, u32 da,
169+ const struct sg_table *sgt, u32 flags);
170+extern struct sg_table *iommu_vunmap(struct iommu *obj, u32 da);
171+extern u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes,
172+ u32 flags);
173+extern void iommu_vfree(struct iommu *obj, const u32 da);
174+extern u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
175+ u32 flags);
176+extern void iommu_kunmap(struct iommu *obj, u32 da);
177+extern u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes,
178+ u32 flags);
179+extern void iommu_kfree(struct iommu *obj, u32 da);
180+
181+extern void *da_to_va(struct iommu *obj, u32 da);
182+
183+#endif /* __IOMMU_MMAP_H */
184diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c
185new file mode 100644
186index 0000000..6726d10
187--- /dev/null
188+++ b/arch/arm/plat-omap/iovmm.c
189@@ -0,0 +1,891 @@
190+/*
191+ * omap iommu: simple virtual address space management
192+ *
193+ * Copyright (C) 2008-2009 Nokia Corporation
194+ *
195+ * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
196+ *
197+ * This program is free software; you can redistribute it and/or modify
198+ * it under the terms of the GNU General Public License version 2 as
199+ * published by the Free Software Foundation.
200+ */
201+
202+#include <linux/err.h>
203+#include <linux/vmalloc.h>
204+#include <linux/device.h>
205+#include <linux/scatterlist.h>
206+
207+#include <asm/io.h>
208+#include <asm/cacheflush.h>
209+
210+#include <mach/iommu.h>
211+#include <mach/iovmm.h>
212+
213+#include "iopgtable.h"
214+
215+/*
216+ * A device driver needs to create address mappings between:
217+ *
218+ * - iommu/device address
219+ * - physical address
220+ * - mpu virtual address
221+ *
222+ * There are 4 possible patterns for them:
223+ *
224+ * |iova/ mapping iommu_ page
225+ * | da pa va (d)-(p)-(v) function type
226+ * ---------------------------------------------------------------------------
227+ * 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s
228+ * 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s
229+ * 3 | c d c 1 - n - 1 _vmap() / _vunmap() s
230+ * 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n*
231+ *
232+ *
233+ * 'iova': device iommu virtual address
234+ * 'da': alias of 'iova'
235+ * 'pa': physical address
236+ * 'va': mpu virtual address
237+ *
238+ * 'c': contiguous memory area
239+ * 'd': dicontiguous memory area
240+ * 'a': anonymous memory allocation
241+ * '()': optional feature
242+ *
243+ * 'n': a normal page(4KB) size is used.
244+ * 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used.
245+ *
246+ * '*': not yet, but feasible.
247+ */
248+
249+static struct kmem_cache *iovm_area_cachep;
250+
251+/* return total bytes of sg buffers */
252+static size_t sgtable_len(const struct sg_table *sgt)
253+{
254+ unsigned int i, total = 0;
255+ struct scatterlist *sg;
256+
257+ if (!sgt)
258+ return 0;
259+
260+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
261+ size_t bytes;
262+
263+ bytes = sg_dma_len(sg);
264+
265+ if (!iopgsz_ok(bytes)) {
266+ pr_err("%s: sg[%d] not iommu pagesize(%x)\n",
267+ __func__, i, bytes);
268+ return 0;
269+ }
270+
271+ total += bytes;
272+ }
273+
274+ return total;
275+}
276+#define sgtable_ok(x) (!!sgtable_len(x))
277+
278+/*
279+ * calculate the optimal number sg elements from total bytes based on
280+ * iommu superpages
281+ */
282+static unsigned int sgtable_nents(size_t bytes)
283+{
284+ int i;
285+ unsigned int nr_entries;
286+ const unsigned long pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
287+
288+ if (!IS_ALIGNED(bytes, PAGE_SIZE)) {
289+ pr_err("%s: wrong size %08x\n", __func__, bytes);
290+ return 0;
291+ }
292+
293+ nr_entries = 0;
294+ for (i = 0; i < ARRAY_SIZE(pagesize); i++) {
295+ if (bytes >= pagesize[i]) {
296+ nr_entries += (bytes / pagesize[i]);
297+ bytes %= pagesize[i];
298+ }
299+ }
300+ BUG_ON(bytes);
301+
302+ return nr_entries;
303+}
304+
305+/* allocate and initialize sg_table header(a kind of 'superblock') */
306+static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags)
307+{
308+ unsigned int nr_entries;
309+ int err;
310+ struct sg_table *sgt;
311+
312+ if (!bytes)
313+ return ERR_PTR(-EINVAL);
314+
315+ if (!IS_ALIGNED(bytes, PAGE_SIZE))
316+ return ERR_PTR(-EINVAL);
317+
318+ /* FIXME: IOVMF_DA_FIXED should support 'superpages' */
319+ if ((flags & IOVMF_LINEAR) && (flags & IOVMF_DA_ANON)) {
320+ nr_entries = sgtable_nents(bytes);
321+ if (!nr_entries)
322+ return ERR_PTR(-EINVAL);
323+ } else
324+ nr_entries = bytes / PAGE_SIZE;
325+
326+ sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
327+ if (!sgt)
328+ return ERR_PTR(-ENOMEM);
329+
330+ err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL);
331+ if (err)
332+ return ERR_PTR(err);
333+
334+ pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries);
335+
336+ return sgt;
337+}
338+
339+/* free sg_table header(a kind of superblock) */
340+static void sgtable_free(struct sg_table *sgt)
341+{
342+ if (!sgt)
343+ return;
344+
345+ sg_free_table(sgt);
346+ kfree(sgt);
347+
348+ pr_debug("%s: sgt:%p\n", __func__, sgt);
349+}
350+
351+/* map 'sglist' to a contiguous mpu virtual area and return 'va' */
352+static void *vmap_sg(const struct sg_table *sgt)
353+{
354+ u32 va;
355+ size_t total;
356+ unsigned int i;
357+ struct scatterlist *sg;
358+ struct vm_struct *new;
359+
360+ total = sgtable_len(sgt);
361+ if (!total)
362+ return ERR_PTR(-EINVAL);
363+
364+ new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END);
365+ if (!new)
366+ return ERR_PTR(-ENOMEM);
367+ va = (u32)new->addr;
368+
369+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
370+ size_t bytes;
371+ u32 pa;
372+ int err;
373+
374+ pa = sg_phys(sg);
375+ bytes = sg_dma_len(sg);
376+
377+ BUG_ON(bytes != PAGE_SIZE);
378+
379+ err = ioremap_page(va, pa, MT_DEVICE);
380+ if (err)
381+ goto err_out;
382+
383+ va += bytes;
384+ }
385+
386+ flush_cache_vmap(new->addr, total);
387+ return new->addr;
388+
389+err_out:
390+ WARN_ON(1); /* FIXME: cleanup some mpu mappings */
391+ vunmap(new->addr);
392+ return ERR_PTR(-EAGAIN);
393+}
394+
395+static inline void vunmap_sg(const void *va)
396+{
397+ vunmap(va);
398+}
399+
400+static struct iovm_struct *__find_iovm_area(struct iommu *obj, const u32 da)
401+{
402+ struct iovm_struct *tmp;
403+
404+ list_for_each_entry(tmp, &obj->mmap, list) {
405+ if ((da >= tmp->da_start) && (da < tmp->da_end)) {
406+ size_t len;
407+
408+ len = tmp->da_end - tmp->da_start;
409+
410+ dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n",
411+ __func__, tmp->da_start, da, tmp->da_end, len,
412+ tmp->flags);
413+
414+ return tmp;
415+ }
416+ }
417+
418+ return NULL;
419+}
420+
421+/**
422+ * find_iovm_area - find iovma which includes @da
423+ * @da: iommu device virtual address
424+ *
425+ * Find the existing iovma starting at @da
426+ */
427+struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da)
428+{
429+ struct iovm_struct *area;
430+
431+ mutex_lock(&obj->mmap_lock);
432+ area = __find_iovm_area(obj, da);
433+ mutex_unlock(&obj->mmap_lock);
434+
435+ return area;
436+}
437+EXPORT_SYMBOL_GPL(find_iovm_area);
438+
439+/*
440+ * This finds the hole(area) which fits the requested address and len
441+ * in iovmas mmap, and returns the new allocated iovma.
442+ */
443+static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
444+ size_t bytes, u32 flags)
445+{
446+ struct iovm_struct *new, *tmp;
447+ u32 start, prev_end, alignement;
448+
449+ if (!obj || !bytes)
450+ return ERR_PTR(-EINVAL);
451+
452+ start = da;
453+ alignement = PAGE_SIZE;
454+
455+ if (flags & IOVMF_DA_ANON) {
456+ /*
457+ * Reserve the first page for NULL
458+ */
459+ start = PAGE_SIZE;
460+ if (flags & IOVMF_LINEAR)
461+ alignement = iopgsz_max(bytes);
462+ start = roundup(start, alignement);
463+ }
464+
465+ tmp = NULL;
466+ if (list_empty(&obj->mmap))
467+ goto found;
468+
469+ prev_end = 0;
470+ list_for_each_entry(tmp, &obj->mmap, list) {
471+
472+ if ((prev_end <= start) && (start + bytes < tmp->da_start))
473+ goto found;
474+
475+ if (flags & IOVMF_DA_ANON)
476+ start = roundup(tmp->da_end, alignement);
477+
478+ prev_end = tmp->da_end;
479+ }
480+
481+ if ((start >= prev_end) && (ULONG_MAX - start >= bytes))
482+ goto found;
483+
484+ dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n",
485+ __func__, da, bytes, flags);
486+
487+ return ERR_PTR(-EINVAL);
488+
489+found:
490+ new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL);
491+ if (!new)
492+ return ERR_PTR(-ENOMEM);
493+
494+ new->iommu = obj;
495+ new->da_start = start;
496+ new->da_end = start + bytes;
497+ new->flags = flags;
498+
499+ /*
500+ * keep ascending order of iovmas
501+ */
502+ if (tmp)
503+ list_add_tail(&new->list, &tmp->list);
504+ else
505+ list_add(&new->list, &obj->mmap);
506+
507+ dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n",
508+ __func__, new->da_start, start, new->da_end, bytes, flags);
509+
510+ return new;
511+}
512+
513+static void free_iovm_area(struct iommu *obj, struct iovm_struct *area)
514+{
515+ size_t bytes;
516+
517+ BUG_ON(!obj || !area);
518+
519+ bytes = area->da_end - area->da_start;
520+
521+ dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n",
522+ __func__, area->da_start, area->da_end, bytes, area->flags);
523+
524+ list_del(&area->list);
525+ kmem_cache_free(iovm_area_cachep, area);
526+}
527+
528+/**
529+ * da_to_va - convert (d) to (v)
530+ * @obj: objective iommu
531+ * @da: iommu device virtual address
532+ * @va: mpu virtual address
533+ *
534+ * Returns mpu virtual addr which corresponds to a given device virtual addr
535+ */
536+void *da_to_va(struct iommu *obj, u32 da)
537+{
538+ void *va = NULL;
539+ struct iovm_struct *area;
540+
541+ mutex_lock(&obj->mmap_lock);
542+
543+ area = __find_iovm_area(obj, da);
544+ if (!area) {
545+ dev_warn(obj->dev, "%s: no da area(%08x)\n", __func__, da);
546+ goto out;
547+ }
548+ va = area->va;
549+ mutex_unlock(&obj->mmap_lock);
550+out:
551+ return va;
552+}
553+EXPORT_SYMBOL_GPL(da_to_va);
554+
555+static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va)
556+{
557+ unsigned int i;
558+ struct scatterlist *sg;
559+ void *va = _va;
560+ void *va_end;
561+
562+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
563+ struct page *pg;
564+ const size_t bytes = PAGE_SIZE;
565+
566+ /*
567+ * iommu 'superpage' isn't supported with 'iommu_vmalloc()'
568+ */
569+ pg = vmalloc_to_page(va);
570+ BUG_ON(!pg);
571+ sg_set_page(sg, pg, bytes, 0);
572+
573+ va += bytes;
574+ }
575+
576+ va_end = _va + PAGE_SIZE * i;
577+ flush_cache_vmap(_va, va_end);
578+}
579+
580+static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
581+{
582+ /*
583+ * Actually this is not necessary at all, just exists for
584+ * consistency of the code readibility.
585+ */
586+ BUG_ON(!sgt);
587+}
588+
589+static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len)
590+{
591+ unsigned int i;
592+ struct scatterlist *sg;
593+ void *va;
594+
595+ va = phys_to_virt(pa);
596+
597+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
598+ size_t bytes;
599+
600+ bytes = iopgsz_max(len);
601+
602+ BUG_ON(!iopgsz_ok(bytes));
603+
604+ sg_set_buf(sg, phys_to_virt(pa), bytes);
605+ /*
606+ * 'pa' is cotinuous(linear).
607+ */
608+ pa += bytes;
609+ len -= bytes;
610+ }
611+ BUG_ON(len);
612+
613+ clean_dcache_area(va, len);
614+}
615+
616+static inline void sgtable_drain_kmalloc(struct sg_table *sgt)
617+{
618+ /*
619+ * Actually this is not necessary at all, just exists for
620+ * consistency of the code readibility
621+ */
622+ BUG_ON(!sgt);
623+}
624+
625+/* create 'da' <-> 'pa' mapping from 'sgt' */
626+static int map_iovm_area(struct iommu *obj, struct iovm_struct *new,
627+ const struct sg_table *sgt, u32 flags)
628+{
629+ int err;
630+ unsigned int i, j;
631+ struct scatterlist *sg;
632+ u32 da = new->da_start;
633+
634+ if (!obj || !new || !sgt)
635+ return -EINVAL;
636+
637+ BUG_ON(!sgtable_ok(sgt));
638+
639+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
640+ u32 pa;
641+ int pgsz;
642+ size_t bytes;
643+ struct iotlb_entry e;
644+
645+ pa = sg_phys(sg);
646+ bytes = sg_dma_len(sg);
647+
648+ flags &= ~IOVMF_PGSZ_MASK;
649+ pgsz = bytes_to_iopgsz(bytes);
650+ if (pgsz < 0)
651+ goto err_out;
652+ flags |= pgsz;
653+
654+ pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
655+ i, da, pa, bytes);
656+
657+ iotlb_init_entry(&e, da, pa, flags);
658+ err = iopgtable_store_entry(obj, &e);
659+ if (err)
660+ goto err_out;
661+
662+ da += bytes;
663+ }
664+ return 0;
665+
666+err_out:
667+ da = new->da_start;
668+
669+ for_each_sg(sgt->sgl, sg, i, j) {
670+ size_t bytes;
671+
672+ bytes = iopgtable_clear_entry(obj, da);
673+
674+ BUG_ON(!iopgsz_ok(bytes));
675+
676+ da += bytes;
677+ }
678+ return err;
679+}
680+
681+/* release 'da' <-> 'pa' mapping */
682+static void unmap_iovm_area(struct iommu *obj, struct iovm_struct *area)
683+{
684+ u32 start;
685+ size_t total = area->da_end - area->da_start;
686+
687+ BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE));
688+
689+ start = area->da_start;
690+ while (total > 0) {
691+ size_t bytes;
692+
693+ bytes = iopgtable_clear_entry(obj, start);
694+ if (bytes == 0)
695+ bytes = PAGE_SIZE;
696+ else
697+ dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n",
698+ __func__, start, bytes, area->flags);
699+
700+ BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
701+
702+ total -= bytes;
703+ start += bytes;
704+ }
705+ BUG_ON(total);
706+}
707+
708+/* template function for all unmapping */
709+static struct sg_table *unmap_vm_area(struct iommu *obj, const u32 da,
710+ void (*fn)(const void *), u32 flags)
711+{
712+ struct sg_table *sgt = NULL;
713+ struct iovm_struct *area;
714+
715+ BUG_ON(in_interrupt());
716+
717+ if (!IS_ALIGNED(da, PAGE_SIZE)) {
718+ dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da);
719+ return NULL;
720+ }
721+
722+ mutex_lock(&obj->mmap_lock);
723+
724+ area = __find_iovm_area(obj, da);
725+ if (!area) {
726+ dev_err(obj->dev, "%s: no da area(%08x)\n", __func__, da);
727+ goto out;
728+ }
729+
730+ if ((area->flags & flags) != flags) {
731+ dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__,
732+ area->flags);
733+ goto out;
734+ }
735+ sgt = (struct sg_table *)area->sgt;
736+
737+ unmap_iovm_area(obj, area);
738+
739+ fn(area->va);
740+
741+ dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__,
742+ area->da_start, da, area->da_end,
743+ area->da_end - area->da_start, area->flags);
744+
745+ free_iovm_area(obj, area);
746+out:
747+ mutex_unlock(&obj->mmap_lock);
748+
749+ return sgt;
750+}
751+
752+static u32 map_iommu_region(struct iommu *obj, u32 da,
753+ const struct sg_table *sgt, void *va, size_t bytes, u32 flags)
754+{
755+ int err = -ENOMEM;
756+ struct iovm_struct *new;
757+
758+ mutex_lock(&obj->mmap_lock);
759+
760+ new = alloc_iovm_area(obj, da, bytes, flags);
761+ if (IS_ERR(new)) {
762+ err = PTR_ERR(new);
763+ goto err_alloc_iovma;
764+ }
765+ new->va = va;
766+ new->sgt = sgt;
767+
768+ if (map_iovm_area(obj, new, sgt, new->flags))
769+ goto err_map;
770+
771+ mutex_unlock(&obj->mmap_lock);
772+
773+ dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n",
774+ __func__, new->da_start, bytes, new->flags, va);
775+
776+ return new->da_start;
777+
778+err_map:
779+ free_iovm_area(obj, new);
780+err_alloc_iovma:
781+ mutex_unlock(&obj->mmap_lock);
782+ return err;
783+}
784+
785+static inline u32 __iommu_vmap(struct iommu *obj, u32 da,
786+ const struct sg_table *sgt, void *va, size_t bytes, u32 flags)
787+{
788+ return map_iommu_region(obj, da, sgt, va, bytes, flags);
789+}
790+
791+/**
792+ * iommu_vmap - (d)-(p)-(v) address mapper
793+ * @obj: objective iommu
794+ * @sgt: address of scatter gather table
795+ * @flags: iovma and page property
796+ *
797+ * Creates 1-n-1 mapping with given @sgt and returns @da.
798+ * All @sgt element must be io page size aligned.
799+ */
800+u32 iommu_vmap(struct iommu *obj, u32 da, const struct sg_table *sgt,
801+ u32 flags)
802+{
803+ size_t bytes;
804+ void *va;
805+
806+ if (!obj || !obj->dev || !sgt)
807+ return -EINVAL;
808+
809+ bytes = sgtable_len(sgt);
810+ if (!bytes)
811+ return -EINVAL;
812+ bytes = PAGE_ALIGN(bytes);
813+
814+ va = vmap_sg(sgt);
815+ if (IS_ERR(va))
816+ return PTR_ERR(va);
817+
818+ flags &= IOVMF_HW_MASK;
819+ flags |= IOVMF_DISCONT;
820+ flags |= IOVMF_MMIO;
821+ flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
822+
823+ da = __iommu_vmap(obj, da, sgt, va, bytes, flags);
824+ if (IS_ERR_VALUE(da))
825+ vunmap_sg(va);
826+
827+ return da;
828+}
829+EXPORT_SYMBOL_GPL(iommu_vmap);
830+
831+/**
832+ * iommu_vunmap - release virtual mapping obtained by 'iommu_vmap()'
833+ * @obj: objective iommu
834+ * @da: iommu device virtual address
835+ *
836+ * Free the iommu virtually contiguous memory area starting at
837+ * @da, which was returned by 'iommu_vmap()'.
838+ */
839+struct sg_table *iommu_vunmap(struct iommu *obj, u32 da)
840+{
841+ struct sg_table *sgt;
842+ /*
843+ * 'sgt' is allocated before 'iommu_vmalloc()' is called.
844+ * Just returns 'sgt' to the caller to free
845+ */
846+ sgt = unmap_vm_area(obj, da, vunmap_sg, IOVMF_DISCONT | IOVMF_MMIO);
847+ if (!sgt)
848+ dev_err(obj->dev, "%s: No sgt\n", __func__);
849+ return sgt;
850+}
851+EXPORT_SYMBOL_GPL(iommu_vunmap);
852+
853+/**
854+ * iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
855+ * @obj: objective iommu
856+ * @da: contiguous iommu virtual memory
857+ * @bytes: allocation size
858+ * @flags: iovma and page property
859+ *
860+ * Allocate @bytes linearly and creates 1-n-1 mapping and returns
861+ * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set.
862+ */
863+u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
864+{
865+ void *va;
866+ struct sg_table *sgt;
867+
868+ if (!obj || !obj->dev || !bytes)
869+ return -EINVAL;
870+
871+ bytes = PAGE_ALIGN(bytes);
872+
873+ va = vmalloc(bytes);
874+ if (!va)
875+ return -ENOMEM;
876+
877+ sgt = sgtable_alloc(bytes, flags);
878+ if (IS_ERR(sgt)) {
879+ da = PTR_ERR(sgt);
880+ goto err_sgt_alloc;
881+ }
882+ sgtable_fill_vmalloc(sgt, va);
883+
884+ flags &= IOVMF_HW_MASK;
885+ flags |= IOVMF_DISCONT;
886+ flags |= IOVMF_ALLOC;
887+ flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
888+
889+ da = __iommu_vmap(obj, da, sgt, va, bytes, flags);
890+ if (IS_ERR_VALUE(da))
891+ goto err_iommu_vmap;
892+
893+ return da;
894+
895+err_iommu_vmap:
896+ sgtable_drain_vmalloc(sgt);
897+ sgtable_free(sgt);
898+err_sgt_alloc:
899+ vfree(va);
900+ return da;
901+}
902+EXPORT_SYMBOL_GPL(iommu_vmalloc);
903+
904+/**
905+ * iommu_vfree - release memory allocated by 'iommu_vmalloc()'
906+ * @obj: objective iommu
907+ * @da: iommu device virtual address
908+ *
909+ * Frees the iommu virtually continuous memory area starting at
910+ * @da, as obtained from 'iommu_vmalloc()'.
911+ */
912+void iommu_vfree(struct iommu *obj, const u32 da)
913+{
914+ struct sg_table *sgt;
915+
916+ sgt = unmap_vm_area(obj, da, vfree, IOVMF_DISCONT | IOVMF_ALLOC);
917+ if (!sgt)
918+ dev_err(obj->dev, "%s: No sgt\n", __func__);
919+ sgtable_free(sgt);
920+}
921+EXPORT_SYMBOL_GPL(iommu_vfree);
922+
923+static u32 __iommu_kmap(struct iommu *obj, u32 da, u32 pa, void *va,
924+ size_t bytes, u32 flags)
925+{
926+ struct sg_table *sgt;
927+
928+ sgt = sgtable_alloc(bytes, flags);
929+ if (IS_ERR(sgt))
930+ return PTR_ERR(sgt);
931+
932+ sgtable_fill_kmalloc(sgt, pa, bytes);
933+
934+ da = map_iommu_region(obj, da, sgt, va, bytes, flags);
935+ if (IS_ERR_VALUE(da)) {
936+ sgtable_drain_kmalloc(sgt);
937+ sgtable_free(sgt);
938+ }
939+
940+ return da;
941+}
942+
943+/**
944+ * iommu_kmap - (d)-(p)-(v) address mapper
945+ * @obj: objective iommu
946+ * @da: contiguous iommu virtual memory
947+ * @pa: contiguous physical memory
948+ * @flags: iovma and page property
949+ *
950+ * Creates 1-1-1 mapping and returns @da again, which can be
951+ * adjusted if 'IOVMF_DA_ANON' is set.
952+ */
953+u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
954+ u32 flags)
955+{
956+ void *va;
957+
958+ if (!obj || !obj->dev || !bytes)
959+ return -EINVAL;
960+
961+ bytes = PAGE_ALIGN(bytes);
962+
963+ va = ioremap(pa, bytes);
964+ if (!va)
965+ return -ENOMEM;
966+
967+ flags &= IOVMF_HW_MASK;
968+ flags |= IOVMF_LINEAR;
969+ flags |= IOVMF_MMIO;
970+ flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
971+
972+ da = __iommu_kmap(obj, da, pa, va, bytes, flags);
973+ if (IS_ERR_VALUE(da))
974+ iounmap(va);
975+
976+ return da;
977+}
978+EXPORT_SYMBOL_GPL(iommu_kmap);
979+
980+/**
981+ * iommu_kunmap - release virtual mapping obtained by 'iommu_kmap()'
982+ * @obj: objective iommu
983+ * @da: iommu device virtual address
984+ *
985+ * Frees the iommu virtually contiguous memory area starting at
986+ * @da, which was passed to and was returned by'iommu_kmap()'.
987+ */
988+void iommu_kunmap(struct iommu *obj, u32 da)
989+{
990+ struct sg_table *sgt;
991+
992+ sgt = unmap_vm_area(obj, da, __iounmap, IOVMF_LINEAR | IOVMF_MMIO);
993+ if (!sgt)
994+ dev_err(obj->dev, "%s: No sgt\n", __func__);
995+ sgtable_free(sgt);
996+}
997+EXPORT_SYMBOL_GPL(iommu_kunmap);
998+
999+/**
1000+ * iommu_kmalloc - (d)-(p)-(v) address allocator and mapper
1001+ * @obj: objective iommu
1002+ * @da: contiguous iommu virtual memory
1003+ * @bytes: bytes for allocation
1004+ * @flags: iovma and page property
1005+ *
1006+ * Allocate @bytes linearly and creates 1-1-1 mapping and returns
1007+ * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set.
1008+ */
1009+u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
1010+{
1011+ void *va;
1012+ u32 pa;
1013+
1014+ if (!obj || !obj->dev || !bytes)
1015+ return -EINVAL;
1016+
1017+ bytes = PAGE_ALIGN(bytes);
1018+
1019+ va = kmalloc(bytes, GFP_KERNEL | GFP_DMA);
1020+ if (!va)
1021+ return -ENOMEM;
1022+ pa = virt_to_phys(va);
1023+
1024+ flags &= IOVMF_HW_MASK;
1025+ flags |= IOVMF_LINEAR;
1026+ flags |= IOVMF_ALLOC;
1027+ flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
1028+
1029+ da = __iommu_kmap(obj, da, pa, va, bytes, flags);
1030+ if (IS_ERR_VALUE(da))
1031+ kfree(va);
1032+
1033+ return da;
1034+}
1035+EXPORT_SYMBOL_GPL(iommu_kmalloc);
1036+
1037+/**
1038+ * iommu_kfree - release virtual mapping obtained by 'iommu_kmalloc()'
1039+ * @obj: objective iommu
1040+ * @da: iommu device virtual address
1041+ *
1042+ * Frees the iommu virtually contiguous memory area starting at
1043+ * @da, which was passed to and was returned by'iommu_kmalloc()'.
1044+ */
1045+void iommu_kfree(struct iommu *obj, u32 da)
1046+{
1047+ struct sg_table *sgt;
1048+
1049+ sgt = unmap_vm_area(obj, da, kfree, IOVMF_LINEAR | IOVMF_ALLOC);
1050+ if (!sgt)
1051+ dev_err(obj->dev, "%s: No sgt\n", __func__);
1052+ sgtable_free(sgt);
1053+}
1054+EXPORT_SYMBOL_GPL(iommu_kfree);
1055+
1056+
1057+static int __init iovmm_init(void)
1058+{
1059+ const unsigned long flags = SLAB_HWCACHE_ALIGN;
1060+ struct kmem_cache *p;
1061+
1062+ p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0,
1063+ flags, NULL);
1064+ if (!p)
1065+ return -ENOMEM;
1066+ iovm_area_cachep = p;
1067+
1068+ return 0;
1069+}
1070+module_init(iovmm_init);
1071+
1072+static void __exit iovmm_exit(void)
1073+{
1074+ kmem_cache_destroy(iovm_area_cachep);
1075+}
1076+module_exit(iovmm_exit);
1077+
1078+MODULE_DESCRIPTION("omap iommu: simple virtual address space management");
1079+MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
1080+MODULE_LICENSE("GPL v2");
1081--
10821.5.6.5
1083
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-05-09 01:44:18 +0000