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Merge branch 'iommu' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6.git into devel

hifive-unleashed-5.1
Russell King 2009-05-25 10:15:59 +01:00 committed by Russell King
parent fc05505b77 5c651ffaee
commit 56a459314a
14 changed files with 2774 additions and 0 deletions
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8
arch/arm/include/asm/mach/map.h
View File

@ -30,6 +30,14 @@ struct map_desc {
#ifdef CONFIG_MMU
extern void iotable_init(struct map_desc *, int);
struct mem_type;
extern const struct mem_type *get_mem_type(unsigned int type);
/*
* external interface to remap single page with appropriate type
*/
extern int ioremap_page(unsigned long virt, unsigned long phys,
const struct mem_type *mtype);
#else
#define iotable_init(map,num) do { } while (0)
#endif

5
arch/arm/mach-omap2/Makefile
View File

@ -28,6 +28,11 @@ endif
obj-$(CONFIG_ARCH_OMAP2) += clock24xx.o
obj-$(CONFIG_ARCH_OMAP3) += clock34xx.o
iommu-y += iommu2.o
iommu-$(CONFIG_ARCH_OMAP3) += omap3-iommu.o
obj-$(CONFIG_OMAP_IOMMU) += $(iommu-y)
# Specific board support
obj-$(CONFIG_MACH_OMAP_GENERIC) += board-generic.o
obj-$(CONFIG_MACH_OMAP_H4) += board-h4.o

323
arch/arm/mach-omap2/iommu2.c 100644
View File

@ -0,0 +1,323 @@
/*
* omap iommu: omap2/3 architecture specific functions
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
* Paul Mundt and Toshihiro Kobayashi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/stringify.h>
#include <mach/iommu.h>
/*
* omap2 architecture specific register bit definitions
*/
#define IOMMU_ARCH_VERSION 0x00000011
/* SYSCONF */
#define MMU_SYS_IDLE_SHIFT 3
#define MMU_SYS_IDLE_FORCE (0 << MMU_SYS_IDLE_SHIFT)
#define MMU_SYS_IDLE_NONE (1 << MMU_SYS_IDLE_SHIFT)
#define MMU_SYS_IDLE_SMART (2 << MMU_SYS_IDLE_SHIFT)
#define MMU_SYS_IDLE_MASK (3 << MMU_SYS_IDLE_SHIFT)
#define MMU_SYS_SOFTRESET (1 << 1)
#define MMU_SYS_AUTOIDLE 1
/* SYSSTATUS */
#define MMU_SYS_RESETDONE 1
/* IRQSTATUS & IRQENABLE */
#define MMU_IRQ_MULTIHITFAULT (1 << 4)
#define MMU_IRQ_TABLEWALKFAULT (1 << 3)
#define MMU_IRQ_EMUMISS (1 << 2)
#define MMU_IRQ_TRANSLATIONFAULT (1 << 1)
#define MMU_IRQ_TLBMISS (1 << 0)
#define MMU_IRQ_MASK \
(MMU_IRQ_MULTIHITFAULT | MMU_IRQ_TABLEWALKFAULT | MMU_IRQ_EMUMISS | \
MMU_IRQ_TRANSLATIONFAULT)
/* MMU_CNTL */
#define MMU_CNTL_SHIFT 1
#define MMU_CNTL_MASK (7 << MMU_CNTL_SHIFT)
#define MMU_CNTL_EML_TLB (1 << 3)
#define MMU_CNTL_TWL_EN (1 << 2)
#define MMU_CNTL_MMU_EN (1 << 1)
#define get_cam_va_mask(pgsz) \
(((pgsz) == MMU_CAM_PGSZ_16M) ? 0xff000000 : \
((pgsz) == MMU_CAM_PGSZ_1M) ? 0xfff00000 : \
((pgsz) == MMU_CAM_PGSZ_64K) ? 0xffff0000 : \
((pgsz) == MMU_CAM_PGSZ_4K) ? 0xfffff000 : 0)
static int omap2_iommu_enable(struct iommu *obj)
{
u32 l, pa;
unsigned long timeout;
if (!obj->iopgd || !IS_ALIGNED((u32)obj->iopgd, SZ_16K))
return -EINVAL;
pa = virt_to_phys(obj->iopgd);
if (!IS_ALIGNED(pa, SZ_16K))
return -EINVAL;
iommu_write_reg(obj, MMU_SYS_SOFTRESET, MMU_SYSCONFIG);
timeout = jiffies + msecs_to_jiffies(20);
do {
l = iommu_read_reg(obj, MMU_SYSSTATUS);
if (l & MMU_SYS_RESETDONE)
break;
} while (time_after(jiffies, timeout));
if (!(l & MMU_SYS_RESETDONE)) {
dev_err(obj->dev, "can't take mmu out of reset\n");
return -ENODEV;
}
l = iommu_read_reg(obj, MMU_REVISION);
dev_info(obj->dev, "%s: version %d.%d\n", obj->name,
(l >> 4) & 0xf, l & 0xf);
l = iommu_read_reg(obj, MMU_SYSCONFIG);
l &= ~MMU_SYS_IDLE_MASK;
l |= (MMU_SYS_IDLE_SMART | MMU_SYS_AUTOIDLE);
iommu_write_reg(obj, l, MMU_SYSCONFIG);
iommu_write_reg(obj, MMU_IRQ_MASK, MMU_IRQENABLE);
iommu_write_reg(obj, pa, MMU_TTB);
l = iommu_read_reg(obj, MMU_CNTL);
l &= ~MMU_CNTL_MASK;
l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN);
iommu_write_reg(obj, l, MMU_CNTL);
return 0;
}
static void omap2_iommu_disable(struct iommu *obj)
{
u32 l = iommu_read_reg(obj, MMU_CNTL);
l &= ~MMU_CNTL_MASK;
iommu_write_reg(obj, l, MMU_CNTL);
iommu_write_reg(obj, MMU_SYS_IDLE_FORCE, MMU_SYSCONFIG);
dev_dbg(obj->dev, "%s is shutting down\n", obj->name);
}
static u32 omap2_iommu_fault_isr(struct iommu *obj, u32 *ra)
{
int i;
u32 stat, da;
const char *err_msg[] = {
"tlb miss",
"translation fault",
"emulation miss",
"table walk fault",
"multi hit fault",
};
stat = iommu_read_reg(obj, MMU_IRQSTATUS);
stat &= MMU_IRQ_MASK;
if (!stat)
return 0;
da = iommu_read_reg(obj, MMU_FAULT_AD);
*ra = da;
dev_err(obj->dev, "%s:\tda:%08x ", __func__, da);
for (i = 0; i < ARRAY_SIZE(err_msg); i++) {
if (stat & (1 << i))
printk("%s ", err_msg[i]);
}
printk("\n");
iommu_write_reg(obj, stat, MMU_IRQSTATUS);
return stat;
}
static void omap2_tlb_read_cr(struct iommu *obj, struct cr_regs *cr)
{
cr->cam = iommu_read_reg(obj, MMU_READ_CAM);
cr->ram = iommu_read_reg(obj, MMU_READ_RAM);
}
static void omap2_tlb_load_cr(struct iommu *obj, struct cr_regs *cr)
{
iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM);
iommu_write_reg(obj, cr->ram, MMU_RAM);
}
static u32 omap2_cr_to_virt(struct cr_regs *cr)
{
u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK;
u32 mask = get_cam_va_mask(cr->cam & page_size);
return cr->cam & mask;
}
static struct cr_regs *omap2_alloc_cr(struct iommu *obj, struct iotlb_entry *e)
{
struct cr_regs *cr;
if (e->da & ~(get_cam_va_mask(e->pgsz))) {
dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__,
e->da);
return ERR_PTR(-EINVAL);
}
cr = kmalloc(sizeof(*cr), GFP_KERNEL);
if (!cr)
return ERR_PTR(-ENOMEM);
cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz;
cr->ram = e->pa | e->endian | e->elsz | e->mixed;
return cr;
}
static inline int omap2_cr_valid(struct cr_regs *cr)
{
return cr->cam & MMU_CAM_V;
}
static u32 omap2_get_pte_attr(struct iotlb_entry *e)
{
u32 attr;
attr = e->mixed << 5;
attr |= e->endian;
attr |= e->elsz >> 3;
attr <<= ((e->pgsz & MMU_CAM_PGSZ_4K) ? 0 : 6);
return attr;
}
static ssize_t omap2_dump_cr(struct iommu *obj, struct cr_regs *cr, char *buf)
{
char *p = buf;
/* FIXME: Need more detail analysis of cam/ram */
p += sprintf(p, "%08x %08x\n", cr->cam, cr->ram);
return p - buf;
}
#define pr_reg(name) \
p += sprintf(p, "%20s: %08x\n", \
__stringify(name), iommu_read_reg(obj, MMU_##name));
static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf)
{
char *p = buf;
pr_reg(REVISION);
pr_reg(SYSCONFIG);
pr_reg(SYSSTATUS);
pr_reg(IRQSTATUS);
pr_reg(IRQENABLE);
pr_reg(WALKING_ST);
pr_reg(CNTL);
pr_reg(FAULT_AD);
pr_reg(TTB);
pr_reg(LOCK);
pr_reg(LD_TLB);
pr_reg(CAM);
pr_reg(RAM);
pr_reg(GFLUSH);
pr_reg(FLUSH_ENTRY);
pr_reg(READ_CAM);
pr_reg(READ_RAM);
pr_reg(EMU_FAULT_AD);
return p - buf;
}
static void omap2_iommu_save_ctx(struct iommu *obj)
{
int i;
u32 *p = obj->ctx;
for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
p[i] = iommu_read_reg(obj, i * sizeof(u32));
dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]);
}
BUG_ON(p[0] != IOMMU_ARCH_VERSION);
}
static void omap2_iommu_restore_ctx(struct iommu *obj)
{
int i;
u32 *p = obj->ctx;
for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
iommu_write_reg(obj, p[i], i * sizeof(u32));
dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]);
}
BUG_ON(p[0] != IOMMU_ARCH_VERSION);
}
static void omap2_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
{
e->da = cr->cam & MMU_CAM_VATAG_MASK;
e->pa = cr->ram & MMU_RAM_PADDR_MASK;
e->valid = cr->cam & MMU_CAM_V;
e->pgsz = cr->cam & MMU_CAM_PGSZ_MASK;
e->endian = cr->ram & MMU_RAM_ENDIAN_MASK;
e->elsz = cr->ram & MMU_RAM_ELSZ_MASK;
e->mixed = cr->ram & MMU_RAM_MIXED;
}
static const struct iommu_functions omap2_iommu_ops = {
.version = IOMMU_ARCH_VERSION,
.enable = omap2_iommu_enable,
.disable = omap2_iommu_disable,
.fault_isr = omap2_iommu_fault_isr,
.tlb_read_cr = omap2_tlb_read_cr,
.tlb_load_cr = omap2_tlb_load_cr,
.cr_to_e = omap2_cr_to_e,
.cr_to_virt = omap2_cr_to_virt,
.alloc_cr = omap2_alloc_cr,
.cr_valid = omap2_cr_valid,
.dump_cr = omap2_dump_cr,
.get_pte_attr = omap2_get_pte_attr,
.save_ctx = omap2_iommu_save_ctx,
.restore_ctx = omap2_iommu_restore_ctx,
.dump_ctx = omap2_iommu_dump_ctx,
};
static int __init omap2_iommu_init(void)
{
return install_iommu_arch(&omap2_iommu_ops);
}
module_init(omap2_iommu_init);
static void __exit omap2_iommu_exit(void)
{
uninstall_iommu_arch(&omap2_iommu_ops);
}
module_exit(omap2_iommu_exit);
MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi");
MODULE_DESCRIPTION("omap iommu: omap2/3 architecture specific functions");
MODULE_LICENSE("GPL v2");

105
arch/arm/mach-omap2/omap3-iommu.c 100644
View File

@ -0,0 +1,105 @@
/*
* omap iommu: omap3 device registration
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/platform_device.h>
#include <mach/iommu.h>
#define OMAP3_MMU1_BASE 0x480bd400
#define OMAP3_MMU2_BASE 0x5d000000
#define OMAP3_MMU1_IRQ 24
#define OMAP3_MMU2_IRQ 28
static unsigned long iommu_base[] __initdata = {
OMAP3_MMU1_BASE,
OMAP3_MMU2_BASE,
};
static int iommu_irq[] __initdata = {
OMAP3_MMU1_IRQ,
OMAP3_MMU2_IRQ,
};
static const struct iommu_platform_data omap3_iommu_pdata[] __initconst = {
{
.name = "isp",
.nr_tlb_entries = 8,
.clk_name = "cam_ick",
},
#if defined(CONFIG_MPU_BRIDGE_IOMMU)
{
.name = "iva2",
.nr_tlb_entries = 32,
.clk_name = "iva2_ck",
},
#endif
};
#define NR_IOMMU_DEVICES ARRAY_SIZE(omap3_iommu_pdata)
static struct platform_device *omap3_iommu_pdev[NR_IOMMU_DEVICES];
static int __init omap3_iommu_init(void)
{
int i, err;
for (i = 0; i < NR_IOMMU_DEVICES; i++) {
struct platform_device *pdev;
struct resource res[2];
pdev = platform_device_alloc("omap-iommu", i);
if (!pdev) {
err = -ENOMEM;
goto err_out;
}
memset(res, 0, sizeof(res));
res[0].start = iommu_base[i];
res[0].end = iommu_base[i] + MMU_REG_SIZE - 1;
res[0].flags = IORESOURCE_MEM;
res[1].start = res[1].end = iommu_irq[i];
res[1].flags = IORESOURCE_IRQ;
err = platform_device_add_resources(pdev, res,
ARRAY_SIZE(res));
if (err)
goto err_out;
err = platform_device_add_data(pdev, &omap3_iommu_pdata[i],
sizeof(omap3_iommu_pdata[0]));
if (err)
goto err_out;
err = platform_device_add(pdev);
if (err)
goto err_out;
omap3_iommu_pdev[i] = pdev;
}
return 0;
err_out:
while (i--)
platform_device_put(omap3_iommu_pdev[i]);
return err;
}
module_init(omap3_iommu_init);
static void __exit omap3_iommu_exit(void)
{
int i;
for (i = 0; i < NR_IOMMU_DEVICES; i++)
platform_device_unregister(omap3_iommu_pdev[i]);
}
module_exit(omap3_iommu_exit);
MODULE_AUTHOR("Hiroshi DOYU");
MODULE_DESCRIPTION("omap iommu: omap3 device registration");
MODULE_LICENSE("GPL v2");

6
arch/arm/mm/ioremap.c
View File

@ -110,6 +110,12 @@ static int remap_area_pages(unsigned long start, unsigned long pfn,
return err;
}
int ioremap_page(unsigned long virt, unsigned long phys,
const struct mem_type *mtype)
{
return remap_area_pages(virt, __phys_to_pfn(phys), PAGE_SIZE, mtype);
}
EXPORT_SYMBOL(ioremap_page);
void __check_kvm_seq(struct mm_struct *mm)
{

1
arch/arm/mm/mmu.c
View File

@ -255,6 +255,7 @@ const struct mem_type *get_mem_type(unsigned int type)
{
return type < ARRAY_SIZE(mem_types) ? &mem_types[type] : NULL;
}
EXPORT_SYMBOL(get_mem_type);
/*
* Adjust the PMD section entries according to the CPU in use.

3
arch/arm/plat-omap/Kconfig
View File

@ -115,6 +115,9 @@ config OMAP_MBOX_FWK
Say Y here if you want to use OMAP Mailbox framework support for
DSP, IVA1.0 and IVA2 in OMAP1/2/3.
config OMAP_IOMMU
tristate
choice
prompt "System timer"
default OMAP_MPU_TIMER

1
arch/arm/plat-omap/Makefile
View File

@ -13,6 +13,7 @@ obj- :=
obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o
obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
obj-$(CONFIG_OMAP_IOMMU) += iommu.o iovmm.o
obj-$(CONFIG_CPU_FREQ) += cpu-omap.o
obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o

168
arch/arm/plat-omap/include/mach/iommu.h 100644
View File

@ -0,0 +1,168 @@
/*
* omap iommu: main structures
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __MACH_IOMMU_H
#define __MACH_IOMMU_H
struct iotlb_entry {
u32 da;
u32 pa;
u32 pgsz, prsvd, valid;
union {
u16 ap;
struct {
u32 endian, elsz, mixed;
};
};
};
struct iommu {
const char *name;
struct module *owner;
struct clk *clk;
void __iomem *regbase;
struct device *dev;
unsigned int refcount;
struct mutex iommu_lock; /* global for this whole object */
/*
* We don't change iopgd for a situation like pgd for a task,
* but share it globally for each iommu.
*/
u32 *iopgd;
spinlock_t page_table_lock; /* protect iopgd */
int nr_tlb_entries;
struct list_head mmap;
struct mutex mmap_lock; /* protect mmap */
int (*isr)(struct iommu *obj);
void *ctx; /* iommu context: registres saved area */
};
struct cr_regs {
union {
struct {
u16 cam_l;
u16 cam_h;
};
u32 cam;
};
union {
struct {
u16 ram_l;
u16 ram_h;
};
u32 ram;
};
};
struct iotlb_lock {
short base;
short vict;
};
/* architecture specific functions */
struct iommu_functions {
unsigned long version;
int (*enable)(struct iommu *obj);
void (*disable)(struct iommu *obj);
u32 (*fault_isr)(struct iommu *obj, u32 *ra);
void (*tlb_read_cr)(struct iommu *obj, struct cr_regs *cr);
void (*tlb_load_cr)(struct iommu *obj, struct cr_regs *cr);
struct cr_regs *(*alloc_cr)(struct iommu *obj, struct iotlb_entry *e);
int (*cr_valid)(struct cr_regs *cr);
u32 (*cr_to_virt)(struct cr_regs *cr);
void (*cr_to_e)(struct cr_regs *cr, struct iotlb_entry *e);
ssize_t (*dump_cr)(struct iommu *obj, struct cr_regs *cr, char *buf);
u32 (*get_pte_attr)(struct iotlb_entry *e);
void (*save_ctx)(struct iommu *obj);
void (*restore_ctx)(struct iommu *obj);
ssize_t (*dump_ctx)(struct iommu *obj, char *buf);
};
struct iommu_platform_data {
const char *name;
const char *clk_name;
const int nr_tlb_entries;
};
#if defined(CONFIG_ARCH_OMAP1)
#error "iommu for this processor not implemented yet"
#else
#include <mach/iommu2.h>
#endif
/*
* utilities for super page(16MB, 1MB, 64KB and 4KB)
*/
#define iopgsz_max(bytes) \
(((bytes) >= SZ_16M) ? SZ_16M : \
((bytes) >= SZ_1M) ? SZ_1M : \
((bytes) >= SZ_64K) ? SZ_64K : \
((bytes) >= SZ_4K) ? SZ_4K : 0)
#define bytes_to_iopgsz(bytes) \
(((bytes) == SZ_16M) ? MMU_CAM_PGSZ_16M : \
((bytes) == SZ_1M) ? MMU_CAM_PGSZ_1M : \
((bytes) == SZ_64K) ? MMU_CAM_PGSZ_64K : \
((bytes) == SZ_4K) ? MMU_CAM_PGSZ_4K : -1)
#define iopgsz_to_bytes(iopgsz) \
(((iopgsz) == MMU_CAM_PGSZ_16M) ? SZ_16M : \
((iopgsz) == MMU_CAM_PGSZ_1M) ? SZ_1M : \
((iopgsz) == MMU_CAM_PGSZ_64K) ? SZ_64K : \
((iopgsz) == MMU_CAM_PGSZ_4K) ? SZ_4K : 0)
#define iopgsz_ok(bytes) (bytes_to_iopgsz(bytes) >= 0)
/*
* global functions
*/
extern u32 iommu_arch_version(void);
extern void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e);
extern u32 iotlb_cr_to_virt(struct cr_regs *cr);
extern int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e);
extern void flush_iotlb_page(struct iommu *obj, u32 da);
extern void flush_iotlb_range(struct iommu *obj, u32 start, u32 end);
extern void flush_iotlb_all(struct iommu *obj);
extern int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e);
extern size_t iopgtable_clear_entry(struct iommu *obj, u32 iova);
extern struct iommu *iommu_get(const char *name);
extern void iommu_put(struct iommu *obj);
extern void iommu_save_ctx(struct iommu *obj);
extern void iommu_restore_ctx(struct iommu *obj);
extern int install_iommu_arch(const struct iommu_functions *ops);
extern void uninstall_iommu_arch(const struct iommu_functions *ops);
extern int foreach_iommu_device(void *data,
int (*fn)(struct device *, void *));
extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf);
extern size_t dump_tlb_entries(struct iommu *obj, char *buf);
#endif /* __MACH_IOMMU_H */

96
arch/arm/plat-omap/include/mach/iommu2.h 100644
View File

@ -0,0 +1,96 @@
/*
* omap iommu: omap2 architecture specific definitions
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __MACH_IOMMU2_H
#define __MACH_IOMMU2_H
#include <linux/io.h>
/*
* MMU Register offsets
*/
#define MMU_REVISION 0x00
#define MMU_SYSCONFIG 0x10
#define MMU_SYSSTATUS 0x14
#define MMU_IRQSTATUS 0x18
#define MMU_IRQENABLE 0x1c
#define MMU_WALKING_ST 0x40
#define MMU_CNTL 0x44
#define MMU_FAULT_AD 0x48
#define MMU_TTB 0x4c
#define MMU_LOCK 0x50
#define MMU_LD_TLB 0x54
#define MMU_CAM 0x58
#define MMU_RAM 0x5c
#define MMU_GFLUSH 0x60
#define MMU_FLUSH_ENTRY 0x64
#define MMU_READ_CAM 0x68
#define MMU_READ_RAM 0x6c
#define MMU_EMU_FAULT_AD 0x70
#define MMU_REG_SIZE 256
/*
* MMU Register bit definitions
*/
#define MMU_LOCK_BASE_SHIFT 10
#define MMU_LOCK_BASE_MASK (0x1f << MMU_LOCK_BASE_SHIFT)
#define MMU_LOCK_BASE(x) \
((x & MMU_LOCK_BASE_MASK) >> MMU_LOCK_BASE_SHIFT)
#define MMU_LOCK_VICT_SHIFT 4
#define MMU_LOCK_VICT_MASK (0x1f << MMU_LOCK_VICT_SHIFT)
#define MMU_LOCK_VICT(x) \
((x & MMU_LOCK_VICT_MASK) >> MMU_LOCK_VICT_SHIFT)
#define MMU_CAM_VATAG_SHIFT 12
#define MMU_CAM_VATAG_MASK \
((~0UL >> MMU_CAM_VATAG_SHIFT) << MMU_CAM_VATAG_SHIFT)
#define MMU_CAM_P (1 << 3)
#define MMU_CAM_V (1 << 2)
#define MMU_CAM_PGSZ_MASK 3
#define MMU_CAM_PGSZ_1M (0 << 0)
#define MMU_CAM_PGSZ_64K (1 << 0)
#define MMU_CAM_PGSZ_4K (2 << 0)
#define MMU_CAM_PGSZ_16M (3 << 0)
#define MMU_RAM_PADDR_SHIFT 12
#define MMU_RAM_PADDR_MASK \
((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)
#define MMU_RAM_ENDIAN_SHIFT 9
#define MMU_RAM_ENDIAN_MASK (1 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_BIG (1 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_LITTLE (0 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ELSZ_SHIFT 7
#define MMU_RAM_ELSZ_MASK (3 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_8 (0 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_16 (1 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_32 (2 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_ELSZ_NONE (3 << MMU_RAM_ELSZ_SHIFT)
#define MMU_RAM_MIXED_SHIFT 6
#define MMU_RAM_MIXED_MASK (1 << MMU_RAM_MIXED_SHIFT)
#define MMU_RAM_MIXED MMU_RAM_MIXED_MASK
/*
* register accessors
*/
static inline u32 iommu_read_reg(struct iommu *obj, size_t offs)
{
return __raw_readl(obj->regbase + offs);
}
static inline void iommu_write_reg(struct iommu *obj, u32 val, size_t offs)
{
__raw_writel(val, obj->regbase + offs);
}
#endif /* __MACH_IOMMU2_H */

94
arch/arm/plat-omap/include/mach/iovmm.h 100644
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@ -0,0 +1,94 @@
/*
* omap iommu: simple virtual address space management
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __IOMMU_MMAP_H
#define __IOMMU_MMAP_H
struct iovm_struct {
struct iommu *iommu; /* iommu object which this belongs to */
u32 da_start; /* area definition */
u32 da_end;
u32 flags; /* IOVMF_: see below */
struct list_head list; /* linked in ascending order */
const struct sg_table *sgt; /* keep 'page' <-> 'da' mapping */
void *va; /* mpu side mapped address */
};
/*
* IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
*
* lower 16 bit is used for h/w and upper 16 bit is for s/w.
*/
#define IOVMF_SW_SHIFT 16
#define IOVMF_HW_SIZE (1 << IOVMF_SW_SHIFT)
#define IOVMF_HW_MASK (IOVMF_HW_SIZE - 1)
#define IOVMF_SW_MASK (~IOVMF_HW_MASK)UL
/*
* iovma: h/w flags derived from cam and ram attribute
*/
#define IOVMF_CAM_MASK (~((1 << 10) - 1))
#define IOVMF_RAM_MASK (~IOVMF_CAM_MASK)
#define IOVMF_PGSZ_MASK (3 << 0)
#define IOVMF_PGSZ_1M MMU_CAM_PGSZ_1M
#define IOVMF_PGSZ_64K MMU_CAM_PGSZ_64K
#define IOVMF_PGSZ_4K MMU_CAM_PGSZ_4K
#define IOVMF_PGSZ_16M MMU_CAM_PGSZ_16M
#define IOVMF_ENDIAN_MASK (1 << 9)
#define IOVMF_ENDIAN_BIG MMU_RAM_ENDIAN_BIG
#define IOVMF_ENDIAN_LITTLE MMU_RAM_ENDIAN_LITTLE
#define IOVMF_ELSZ_MASK (3 << 7)
#define IOVMF_ELSZ_8 MMU_RAM_ELSZ_8
#define IOVMF_ELSZ_16 MMU_RAM_ELSZ_16
#define IOVMF_ELSZ_32 MMU_RAM_ELSZ_32
#define IOVMF_ELSZ_NONE MMU_RAM_ELSZ_NONE
#define IOVMF_MIXED_MASK (1 << 6)
#define IOVMF_MIXED MMU_RAM_MIXED
/*
* iovma: s/w flags, used for mapping and umapping internally.
*/
#define IOVMF_MMIO (1 << IOVMF_SW_SHIFT)
#define IOVMF_ALLOC (2 << IOVMF_SW_SHIFT)
#define IOVMF_ALLOC_MASK (3 << IOVMF_SW_SHIFT)
/* "superpages" is supported just with physically linear pages */
#define IOVMF_DISCONT (1 << (2 + IOVMF_SW_SHIFT))
#define IOVMF_LINEAR (2 << (2 + IOVMF_SW_SHIFT))
#define IOVMF_LINEAR_MASK (3 << (2 + IOVMF_SW_SHIFT))
#define IOVMF_DA_FIXED (1 << (4 + IOVMF_SW_SHIFT))
#define IOVMF_DA_ANON (2 << (4 + IOVMF_SW_SHIFT))
#define IOVMF_DA_MASK (3 << (4 + IOVMF_SW_SHIFT))
extern struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da);
extern u32 iommu_vmap(struct iommu *obj, u32 da,
const struct sg_table *sgt, u32 flags);
extern struct sg_table *iommu_vunmap(struct iommu *obj, u32 da);
extern u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes,
u32 flags);
extern void iommu_vfree(struct iommu *obj, const u32 da);
extern u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
u32 flags);
extern void iommu_kunmap(struct iommu *obj, u32 da);
extern u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes,
u32 flags);
extern void iommu_kfree(struct iommu *obj, u32 da);
extern void *da_to_va(struct iommu *obj, u32 da);
#endif /* __IOMMU_MMAP_H */

996
arch/arm/plat-omap/iommu.c 100644
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@ -0,0 +1,996 @@
/*
* omap iommu: tlb and pagetable primitives
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
* Paul Mundt and Toshihiro Kobayashi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <asm/cacheflush.h>
#include <mach/iommu.h>
#include "iopgtable.h"
/* accommodate the difference between omap1 and omap2/3 */
static const struct iommu_functions *arch_iommu;
static struct platform_driver omap_iommu_driver;
static struct kmem_cache *iopte_cachep;
/**
* install_iommu_arch - Install archtecure specific iommu functions
* @ops: a pointer to architecture specific iommu functions
*
* There are several kind of iommu algorithm(tlb, pagetable) among
* omap series. This interface installs such an iommu algorighm.
**/
int install_iommu_arch(const struct iommu_functions *ops)
{
if (arch_iommu)
return -EBUSY;
arch_iommu = ops;
return 0;
}
EXPORT_SYMBOL_GPL(install_iommu_arch);
/**
* uninstall_iommu_arch - Uninstall archtecure specific iommu functions
* @ops: a pointer to architecture specific iommu functions
*
* This interface uninstalls the iommu algorighm installed previously.
**/
void uninstall_iommu_arch(const struct iommu_functions *ops)
{
if (arch_iommu != ops)
pr_err("%s: not your arch\n", __func__);
arch_iommu = NULL;
}
EXPORT_SYMBOL_GPL(uninstall_iommu_arch);
/**
* iommu_save_ctx - Save registers for pm off-mode support
* @obj: target iommu
**/
void iommu_save_ctx(struct iommu *obj)
{
arch_iommu->save_ctx(obj);
}
EXPORT_SYMBOL_GPL(iommu_save_ctx);
/**
* iommu_restore_ctx - Restore registers for pm off-mode support
* @obj: target iommu
**/
void iommu_restore_ctx(struct iommu *obj)
{
arch_iommu->restore_ctx(obj);
}
EXPORT_SYMBOL_GPL(iommu_restore_ctx);
/**
* iommu_arch_version - Return running iommu arch version
**/
u32 iommu_arch_version(void)
{
return arch_iommu->version;
}
EXPORT_SYMBOL_GPL(iommu_arch_version);
static int iommu_enable(struct iommu *obj)
{
int err;
if (!obj)
return -EINVAL;
clk_enable(obj->clk);
err = arch_iommu->enable(obj);
clk_disable(obj->clk);
return err;
}
static void iommu_disable(struct iommu *obj)
{
if (!obj)
return;
clk_enable(obj->clk);
arch_iommu->disable(obj);
clk_disable(obj->clk);
}
/*
* TLB operations
*/
void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
{
BUG_ON(!cr || !e);
arch_iommu->cr_to_e(cr, e);
}
EXPORT_SYMBOL_GPL(iotlb_cr_to_e);
static inline int iotlb_cr_valid(struct cr_regs *cr)
{
if (!cr)
return -EINVAL;
return arch_iommu->cr_valid(cr);
}
static inline struct cr_regs *iotlb_alloc_cr(struct iommu *obj,
struct iotlb_entry *e)
{
if (!e)
return NULL;
return arch_iommu->alloc_cr(obj, e);
}
u32 iotlb_cr_to_virt(struct cr_regs *cr)
{
return arch_iommu->cr_to_virt(cr);
}
EXPORT_SYMBOL_GPL(iotlb_cr_to_virt);
static u32 get_iopte_attr(struct iotlb_entry *e)
{
return arch_iommu->get_pte_attr(e);
}
static u32 iommu_report_fault(struct iommu *obj, u32 *da)
{
return arch_iommu->fault_isr(obj, da);
}
static void iotlb_lock_get(struct iommu *obj, struct iotlb_lock *l)
{
u32 val;
val = iommu_read_reg(obj, MMU_LOCK);
l->base = MMU_LOCK_BASE(val);
l->vict = MMU_LOCK_VICT(val);
BUG_ON(l->base != 0); /* Currently no preservation is used */
}
static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l)
{
u32 val;
BUG_ON(l->base != 0); /* Currently no preservation is used */
val = (l->base << MMU_LOCK_BASE_SHIFT);
val |= (l->vict << MMU_LOCK_VICT_SHIFT);
iommu_write_reg(obj, val, MMU_LOCK);
}
static void iotlb_read_cr(struct iommu *obj, struct cr_regs *cr)
{
arch_iommu->tlb_read_cr(obj, cr);
}
static void iotlb_load_cr(struct iommu *obj, struct cr_regs *cr)
{
arch_iommu->tlb_load_cr(obj, cr);
iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
iommu_write_reg(obj, 1, MMU_LD_TLB);
}
/**
* iotlb_dump_cr - Dump an iommu tlb entry into buf
* @obj: target iommu
* @cr: contents of cam and ram register
* @buf: output buffer
**/
static inline ssize_t iotlb_dump_cr(struct iommu *obj, struct cr_regs *cr,
char *buf)
{
BUG_ON(!cr || !buf);
return arch_iommu->dump_cr(obj, cr, buf);
}
/**
* load_iotlb_entry - Set an iommu tlb entry
* @obj: target iommu
* @e: an iommu tlb entry info
**/
int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e)
{
int i;
int err = 0;
struct iotlb_lock l;
struct cr_regs *cr;
if (!obj || !obj->nr_tlb_entries || !e)
return -EINVAL;
clk_enable(obj->clk);
for (i = 0; i < obj->nr_tlb_entries; i++) {
struct cr_regs tmp;
iotlb_lock_get(obj, &l);
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &tmp);
if (!iotlb_cr_valid(&tmp))
break;
}
if (i == obj->nr_tlb_entries) {
dev_dbg(obj->dev, "%s: full: no entry\n", __func__);
err = -EBUSY;
goto out;
}
cr = iotlb_alloc_cr(obj, e);
if (IS_ERR(cr)) {
clk_disable(obj->clk);
return PTR_ERR(cr);
}
iotlb_load_cr(obj, cr);
kfree(cr);
/* increment victim for next tlb load */
if (++l.vict == obj->nr_tlb_entries)
l.vict = 0;
iotlb_lock_set(obj, &l);
out:
clk_disable(obj->clk);
return err;
}
EXPORT_SYMBOL_GPL(load_iotlb_entry);
/**
* flush_iotlb_page - Clear an iommu tlb entry
* @obj: target iommu
* @da: iommu device virtual address
*
* Clear an iommu tlb entry which includes 'da' address.
**/
void flush_iotlb_page(struct iommu *obj, u32 da)
{
struct iotlb_lock l;
int i;
clk_enable(obj->clk);
for (i = 0; i < obj->nr_tlb_entries; i++) {
struct cr_regs cr;
u32 start;
size_t bytes;
iotlb_lock_get(obj, &l);
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &cr);
if (!iotlb_cr_valid(&cr))
continue;
start = iotlb_cr_to_virt(&cr);
bytes = iopgsz_to_bytes(cr.cam & 3);
if ((start <= da) && (da < start + bytes)) {
dev_dbg(obj->dev, "%s: %08x<=%08x(%x)\n",
__func__, start, da, bytes);
iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
}
}
clk_disable(obj->clk);
if (i == obj->nr_tlb_entries)
dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da);
}
EXPORT_SYMBOL_GPL(flush_iotlb_page);
/**
* flush_iotlb_range - Clear an iommu tlb entries
* @obj: target iommu
* @start: iommu device virtual address(start)
* @end: iommu device virtual address(end)
*
* Clear an iommu tlb entry which includes 'da' address.
**/
void flush_iotlb_range(struct iommu *obj, u32 start, u32 end)
{
u32 da = start;
while (da < end) {
flush_iotlb_page(obj, da);
/* FIXME: Optimize for multiple page size */
da += IOPTE_SIZE;
}
}
EXPORT_SYMBOL_GPL(flush_iotlb_range);
/**
* flush_iotlb_all - Clear all iommu tlb entries
* @obj: target iommu
**/
void flush_iotlb_all(struct iommu *obj)
{
struct iotlb_lock l;
clk_enable(obj->clk);
l.base = 0;
l.vict = 0;
iotlb_lock_set(obj, &l);
iommu_write_reg(obj, 1, MMU_GFLUSH);
clk_disable(obj->clk);
}
EXPORT_SYMBOL_GPL(flush_iotlb_all);
#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
ssize_t iommu_dump_ctx(struct iommu *obj, char *buf)
{
ssize_t bytes;
if (!obj || !buf)
return -EINVAL;
clk_enable(obj->clk);
bytes = arch_iommu->dump_ctx(obj, buf);
clk_disable(obj->clk);
return bytes;
}
EXPORT_SYMBOL_GPL(iommu_dump_ctx);
static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
{
int i;
struct iotlb_lock saved, l;
struct cr_regs *p = crs;
clk_enable(obj->clk);
iotlb_lock_get(obj, &saved);
memcpy(&l, &saved, sizeof(saved));
for (i = 0; i < obj->nr_tlb_entries; i++) {
struct cr_regs tmp;
iotlb_lock_get(obj, &l);
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &tmp);
if (!iotlb_cr_valid(&tmp))
continue;
*p++ = tmp;
}
iotlb_lock_set(obj, &saved);
clk_disable(obj->clk);
return p - crs;
}
/**
* dump_tlb_entries - dump cr arrays to given buffer
* @obj: target iommu
* @buf: output buffer
**/
size_t dump_tlb_entries(struct iommu *obj, char *buf)
{
int i, n;
struct cr_regs *cr;
char *p = buf;
cr = kcalloc(obj->nr_tlb_entries, sizeof(*cr), GFP_KERNEL);
if (!cr)
return 0;
n = __dump_tlb_entries(obj, cr);
for (i = 0; i < n; i++)
p += iotlb_dump_cr(obj, cr + i, p);
kfree(cr);
return p - buf;
}
EXPORT_SYMBOL_GPL(dump_tlb_entries);
int foreach_iommu_device(void *data, int (*fn)(struct device *, void *))
{
return driver_for_each_device(&omap_iommu_driver.driver,
NULL, data, fn);
}
EXPORT_SYMBOL_GPL(foreach_iommu_device);
#endif /* CONFIG_OMAP_IOMMU_DEBUG_MODULE */
/*
* H/W pagetable operations
*/
static void flush_iopgd_range(u32 *first, u32 *last)
{
/* FIXME: L2 cache should be taken care of if it exists */
do {
asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pgd"
: : "r" (first));
first += L1_CACHE_BYTES / sizeof(*first);
} while (first <= last);
}
static void flush_iopte_range(u32 *first, u32 *last)
{
/* FIXME: L2 cache should be taken care of if it exists */
do {
asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pte"
: : "r" (first));
first += L1_CACHE_BYTES / sizeof(*first);
} while (first <= last);
}
static void iopte_free(u32 *iopte)
{
/* Note: freed iopte's must be clean ready for re-use */
kmem_cache_free(iopte_cachep, iopte);
}
static u32 *iopte_alloc(struct iommu *obj, u32 *iopgd, u32 da)
{
u32 *iopte;
/* a table has already existed */
if (*iopgd)
goto pte_ready;
/*
* do the allocation outside the page table lock
*/
spin_unlock(&obj->page_table_lock);
iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL);
spin_lock(&obj->page_table_lock);
if (!*iopgd) {
if (!iopte)
return ERR_PTR(-ENOMEM);
*iopgd = virt_to_phys(iopte) | IOPGD_TABLE;
flush_iopgd_range(iopgd, iopgd);
dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
} else {
/* We raced, free the reduniovant table */
iopte_free(iopte);
}
pte_ready:
iopte = iopte_offset(iopgd, da);
dev_vdbg(obj->dev,
"%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
__func__, da, iopgd, *iopgd, iopte, *iopte);
return iopte;
}
static int iopgd_alloc_section(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
*iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
flush_iopgd_range(iopgd, iopgd);
return 0;
}
static int iopgd_alloc_super(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
int i;
for (i = 0; i < 16; i++)
*(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER;
flush_iopgd_range(iopgd, iopgd + 15);
return 0;
}
static int iopte_alloc_page(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
u32 *iopte = iopte_alloc(obj, iopgd, da);
if (IS_ERR(iopte))
return PTR_ERR(iopte);
*iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL;
flush_iopte_range(iopte, iopte);
dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n",
__func__, da, pa, iopte, *iopte);
return 0;
}
static int iopte_alloc_large(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
u32 *iopte = iopte_alloc(obj, iopgd, da);
int i;
if (IS_ERR(iopte))
return PTR_ERR(iopte);
for (i = 0; i < 16; i++)
*(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE;
flush_iopte_range(iopte, iopte + 15);
return 0;
}
static int iopgtable_store_entry_core(struct iommu *obj, struct iotlb_entry *e)
{
int (*fn)(struct iommu *, u32, u32, u32);
u32 prot;
int err;
if (!obj || !e)
return -EINVAL;
switch (e->pgsz) {
case MMU_CAM_PGSZ_16M:
fn = iopgd_alloc_super;
break;
case MMU_CAM_PGSZ_1M:
fn = iopgd_alloc_section;
break;
case MMU_CAM_PGSZ_64K:
fn = iopte_alloc_large;
break;
case MMU_CAM_PGSZ_4K:
fn = iopte_alloc_page;
break;
default:
fn = NULL;
BUG();
break;
}
prot = get_iopte_attr(e);
spin_lock(&obj->page_table_lock);
err = fn(obj, e->da, e->pa, prot);
spin_unlock(&obj->page_table_lock);
return err;
}
/**
* iopgtable_store_entry - Make an iommu pte entry
* @obj: target iommu
* @e: an iommu tlb entry info
**/
int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e)
{
int err;
flush_iotlb_page(obj, e->da);
err = iopgtable_store_entry_core(obj, e);
#ifdef PREFETCH_IOTLB
if (!err)
load_iotlb_entry(obj, e);
#endif
return err;
}
EXPORT_SYMBOL_GPL(iopgtable_store_entry);
/**
* iopgtable_lookup_entry - Lookup an iommu pte entry
* @obj: target iommu
* @da: iommu device virtual address
* @ppgd: iommu pgd entry pointer to be returned
* @ppte: iommu pte entry pointer to be returned
**/
void iopgtable_lookup_entry(struct iommu *obj, u32 da, u32 **ppgd, u32 **ppte)
{
u32 *iopgd, *iopte = NULL;
iopgd = iopgd_offset(obj, da);
if (!*iopgd)
goto out;
if (*iopgd & IOPGD_TABLE)
iopte = iopte_offset(iopgd, da);
out:
*ppgd = iopgd;
*ppte = iopte;
}
EXPORT_SYMBOL_GPL(iopgtable_lookup_entry);
static size_t iopgtable_clear_entry_core(struct iommu *obj, u32 da)
{
size_t bytes;
u32 *iopgd = iopgd_offset(obj, da);
int nent = 1;
if (!*iopgd)
return 0;
if (*iopgd & IOPGD_TABLE) {
int i;
u32 *iopte = iopte_offset(iopgd, da);
bytes = IOPTE_SIZE;
if (*iopte & IOPTE_LARGE) {
nent *= 16;
/* rewind to the 1st entry */
iopte = (u32 *)((u32)iopte & IOLARGE_MASK);
}
bytes *= nent;
memset(iopte, 0, nent * sizeof(*iopte));
flush_iopte_range(iopte, iopte + (nent - 1) * sizeof(*iopte));
/*
* do table walk to check if this table is necessary or not
*/
iopte = iopte_offset(iopgd, 0);
for (i = 0; i < PTRS_PER_IOPTE; i++)
if (iopte[i])
goto out;
iopte_free(iopte);
nent = 1; /* for the next L1 entry */
} else {
bytes = IOPGD_SIZE;
if (*iopgd & IOPGD_SUPER) {
nent *= 16;
/* rewind to the 1st entry */
iopgd = (u32 *)((u32)iopgd & IOSUPER_MASK);
}
bytes *= nent;
}
memset(iopgd, 0, nent * sizeof(*iopgd));
flush_iopgd_range(iopgd, iopgd + (nent - 1) * sizeof(*iopgd));
out:
return bytes;
}
/**
* iopgtable_clear_entry - Remove an iommu pte entry
* @obj: target iommu
* @da: iommu device virtual address
**/
size_t iopgtable_clear_entry(struct iommu *obj, u32 da)
{
size_t bytes;
spin_lock(&obj->page_table_lock);
bytes = iopgtable_clear_entry_core(obj, da);
flush_iotlb_page(obj, da);
spin_unlock(&obj->page_table_lock);
return bytes;
}
EXPORT_SYMBOL_GPL(iopgtable_clear_entry);
static void iopgtable_clear_entry_all(struct iommu *obj)
{
int i;
spin_lock(&obj->page_table_lock);
for (i = 0; i < PTRS_PER_IOPGD; i++) {
u32 da;
u32 *iopgd;
da = i << IOPGD_SHIFT;
iopgd = iopgd_offset(obj, da);
if (!*iopgd)
continue;
if (*iopgd & IOPGD_TABLE)
iopte_free(iopte_offset(iopgd, 0));
*iopgd = 0;
flush_iopgd_range(iopgd, iopgd);
}
flush_iotlb_all(obj);
spin_unlock(&obj->page_table_lock);
}
/*
* Device IOMMU generic operations
*/
static irqreturn_t iommu_fault_handler(int irq, void *data)
{
u32 stat, da;
u32 *iopgd, *iopte;
int err = -EIO;
struct iommu *obj = data;
if (!obj->refcount)
return IRQ_NONE;
/* Dynamic loading TLB or PTE */
if (obj->isr)
err = obj->isr(obj);
if (!err)
return IRQ_HANDLED;
clk_enable(obj->clk);
stat = iommu_report_fault(obj, &da);
clk_disable(obj->clk);
if (!stat)
return IRQ_HANDLED;
iopgd = iopgd_offset(obj, da);
if (!(*iopgd & IOPGD_TABLE)) {
dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x\n", __func__,
da, iopgd, *iopgd);
return IRQ_NONE;
}
iopte = iopte_offset(iopgd, da);
dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
__func__, da, iopgd, *iopgd, iopte, *iopte);
return IRQ_NONE;
}
static int device_match_by_alias(struct device *dev, void *data)
{
struct iommu *obj = to_iommu(dev);
const char *name = data;
pr_debug("%s: %s %s\n", __func__, obj->name, name);
return strcmp(obj->name, name) == 0;
}
/**
* iommu_get - Get iommu handler
* @name: target iommu name
**/
struct iommu *iommu_get(const char *name)
{
int err = -ENOMEM;
struct device *dev;
struct iommu *obj;
dev = driver_find_device(&omap_iommu_driver.driver, NULL, (void *)name,
device_match_by_alias);
if (!dev)
return ERR_PTR(-ENODEV);
obj = to_iommu(dev);
mutex_lock(&obj->iommu_lock);
if (obj->refcount++ == 0) {
err = iommu_enable(obj);
if (err)
goto err_enable;
flush_iotlb_all(obj);
}
if (!try_module_get(obj->owner))
goto err_module;
mutex_unlock(&obj->iommu_lock);
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
return obj;
err_module:
if (obj->refcount == 1)
iommu_disable(obj);
err_enable:
obj->refcount--;
mutex_unlock(&obj->iommu_lock);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(iommu_get);
/**
* iommu_put - Put back iommu handler
* @obj: target iommu
**/
void iommu_put(struct iommu *obj)
{
if (!obj && IS_ERR(obj))
return;
mutex_lock(&obj->iommu_lock);
if (--obj->refcount == 0)
iommu_disable(obj);
module_put(obj->owner);
mutex_unlock(&obj->iommu_lock);
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
}
EXPORT_SYMBOL_GPL(iommu_put);
/*
* OMAP Device MMU(IOMMU) detection
*/
static int __devinit omap_iommu_probe(struct platform_device *pdev)
{
int err = -ENODEV;
void *p;
int irq;
struct iommu *obj;
struct resource *res;
struct iommu_platform_data *pdata = pdev->dev.platform_data;
if (pdev->num_resources != 2)
return -EINVAL;
obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
if (!obj)
return -ENOMEM;
obj->clk = clk_get(&pdev->dev, pdata->clk_name);
if (IS_ERR(obj->clk))
goto err_clk;
obj->nr_tlb_entries = pdata->nr_tlb_entries;
obj->name = pdata->name;
obj->dev = &pdev->dev;
obj->ctx = (void *)obj + sizeof(*obj);
mutex_init(&obj->iommu_lock);
mutex_init(&obj->mmap_lock);
spin_lock_init(&obj->page_table_lock);
INIT_LIST_HEAD(&obj->mmap);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
err = -ENODEV;
goto err_mem;
}
obj->regbase = ioremap(res->start, resource_size(res));
if (!obj->regbase) {
err = -ENOMEM;
goto err_mem;
}
res = request_mem_region(res->start, resource_size(res),
dev_name(&pdev->dev));
if (!res) {
err = -EIO;
goto err_mem;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
err = -ENODEV;
goto err_irq;
}
err = request_irq(irq, iommu_fault_handler, IRQF_SHARED,
dev_name(&pdev->dev), obj);
if (err < 0)
goto err_irq;
platform_set_drvdata(pdev, obj);
p = (void *)__get_free_pages(GFP_KERNEL, get_order(IOPGD_TABLE_SIZE));
if (!p) {
err = -ENOMEM;
goto err_pgd;
}
memset(p, 0, IOPGD_TABLE_SIZE);
clean_dcache_area(p, IOPGD_TABLE_SIZE);
obj->iopgd = p;
BUG_ON(!IS_ALIGNED((unsigned long)obj->iopgd, IOPGD_TABLE_SIZE));
dev_info(&pdev->dev, "%s registered\n", obj->name);
return 0;
err_pgd:
free_irq(irq, obj);
err_irq:
release_mem_region(res->start, resource_size(res));
iounmap(obj->regbase);
err_mem:
clk_put(obj->clk);
err_clk:
kfree(obj);
return err;
}
static int __devexit omap_iommu_remove(struct platform_device *pdev)
{
int irq;
struct resource *res;
struct iommu *obj = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
iopgtable_clear_entry_all(obj);
free_pages((unsigned long)obj->iopgd, get_order(IOPGD_TABLE_SIZE));
irq = platform_get_irq(pdev, 0);
free_irq(irq, obj);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
iounmap(obj->regbase);
clk_put(obj->clk);
dev_info(&pdev->dev, "%s removed\n", obj->name);
kfree(obj);
return 0;
}
static struct platform_driver omap_iommu_driver = {
.probe = omap_iommu_probe,
.remove = __devexit_p(omap_iommu_remove),
.driver = {
.name = "omap-iommu",
},
};
static void iopte_cachep_ctor(void *iopte)
{
clean_dcache_area(iopte, IOPTE_TABLE_SIZE);
}
static int __init omap_iommu_init(void)
{
struct kmem_cache *p;
const unsigned long flags = SLAB_HWCACHE_ALIGN;
size_t align = 1 << 10; /* L2 pagetable alignement */
p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
iopte_cachep_ctor);
if (!p)
return -ENOMEM;
iopte_cachep = p;
return platform_driver_register(&omap_iommu_driver);
}
module_init(omap_iommu_init);
static void __exit omap_iommu_exit(void)
{
kmem_cache_destroy(iopte_cachep);
platform_driver_unregister(&omap_iommu_driver);
}
module_exit(omap_iommu_exit);
MODULE_DESCRIPTION("omap iommu: tlb and pagetable primitives");
MODULE_ALIAS("platform:omap-iommu");
MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi");
MODULE_LICENSE("GPL v2");

72
arch/arm/plat-omap/iopgtable.h 100644
View File

@ -0,0 +1,72 @@
/*
* omap iommu: pagetable definitions
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __PLAT_OMAP_IOMMU_H
#define __PLAT_OMAP_IOMMU_H
#define IOPGD_SHIFT 20
#define IOPGD_SIZE (1 << IOPGD_SHIFT)
#define IOPGD_MASK (~(IOPGD_SIZE - 1))
#define IOSECTION_MASK IOPGD_MASK
#define PTRS_PER_IOPGD (1 << (32 - IOPGD_SHIFT))
#define IOPGD_TABLE_SIZE (PTRS_PER_IOPGD * sizeof(u32))
#define IOSUPER_SIZE (IOPGD_SIZE << 4)
#define IOSUPER_MASK (~(IOSUPER_SIZE - 1))
#define IOPTE_SHIFT 12
#define IOPTE_SIZE (1 << IOPTE_SHIFT)
#define IOPTE_MASK (~(IOPTE_SIZE - 1))
#define IOPAGE_MASK IOPTE_MASK
#define PTRS_PER_IOPTE (1 << (IOPGD_SHIFT - IOPTE_SHIFT))
#define IOPTE_TABLE_SIZE (PTRS_PER_IOPTE * sizeof(u32))
#define IOLARGE_SIZE (IOPTE_SIZE << 4)
#define IOLARGE_MASK (~(IOLARGE_SIZE - 1))
#define IOPGD_TABLE (1 << 0)
#define IOPGD_SECTION (2 << 0)
#define IOPGD_SUPER (1 << 18 | 2 << 0)
#define IOPTE_SMALL (2 << 0)
#define IOPTE_LARGE (1 << 0)
#define iopgd_index(da) (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
#define iopgd_offset(obj, da) ((obj)->iopgd + iopgd_index(da))
#define iopte_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
#define iopte_vaddr(iopgd) ((u32 *)phys_to_virt(iopte_paddr(iopgd)))
#define iopte_index(da) (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
#define iopte_offset(iopgd, da) (iopte_vaddr(iopgd) + iopte_index(da))
static inline u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
u32 flags)
{
memset(e, 0, sizeof(*e));
e->da = da;
e->pa = pa;
e->valid = 1;
/* FIXME: add OMAP1 support */
e->pgsz = flags & MMU_CAM_PGSZ_MASK;
e->endian = flags & MMU_RAM_ENDIAN_MASK;
e->elsz = flags & MMU_RAM_ELSZ_MASK;
e->mixed = flags & MMU_RAM_MIXED_MASK;
return iopgsz_to_bytes(e->pgsz);
}
#define to_iommu(dev) \
(struct iommu *)platform_get_drvdata(to_platform_device(dev))
#endif /* __PLAT_OMAP_IOMMU_H */

896
arch/arm/plat-omap/iovmm.c 100644
View File

@ -0,0 +1,896 @@
/*
* omap iommu: simple virtual address space management
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/vmalloc.h>
#include <linux/device.h>
#include <linux/scatterlist.h>
#include <asm/cacheflush.h>
#include <asm/mach/map.h>
#include <mach/iommu.h>
#include <mach/iovmm.h>
#include "iopgtable.h"
/*
* A device driver needs to create address mappings between:
*
* - iommu/device address
* - physical address
* - mpu virtual address
*
* There are 4 possible patterns for them:
*
* |iova/ mapping iommu_ page
* | da pa va (d)-(p)-(v) function type
* ---------------------------------------------------------------------------
* 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s
* 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s
* 3 | c d c 1 - n - 1 _vmap() / _vunmap() s
* 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n*
*
*
* 'iova': device iommu virtual address
* 'da': alias of 'iova'
* 'pa': physical address
* 'va': mpu virtual address
*
* 'c': contiguous memory area
* 'd': dicontiguous memory area
* 'a': anonymous memory allocation
* '()': optional feature
*
* 'n': a normal page(4KB) size is used.
* 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used.
*
* '*': not yet, but feasible.
*/
static struct kmem_cache *iovm_area_cachep;
/* return total bytes of sg buffers */
static size_t sgtable_len(const struct sg_table *sgt)
{
unsigned int i, total = 0;
struct scatterlist *sg;
if (!sgt)
return 0;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes;
bytes = sg_dma_len(sg);
if (!iopgsz_ok(bytes)) {
pr_err("%s: sg[%d] not iommu pagesize(%x)\n",
__func__, i, bytes);
return 0;
}
total += bytes;
}
return total;
}
#define sgtable_ok(x) (!!sgtable_len(x))
/*
* calculate the optimal number sg elements from total bytes based on
* iommu superpages
*/
static unsigned int sgtable_nents(size_t bytes)
{
int i;
unsigned int nr_entries;
const unsigned long pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
if (!IS_ALIGNED(bytes, PAGE_SIZE)) {
pr_err("%s: wrong size %08x\n", __func__, bytes);
return 0;
}
nr_entries = 0;
for (i = 0; i < ARRAY_SIZE(pagesize); i++) {
if (bytes >= pagesize[i]) {
nr_entries += (bytes / pagesize[i]);
bytes %= pagesize[i];
}
}
BUG_ON(bytes);
return nr_entries;
}
/* allocate and initialize sg_table header(a kind of 'superblock') */
static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags)
{
unsigned int nr_entries;
int err;
struct sg_table *sgt;
if (!bytes)
return ERR_PTR(-EINVAL);
if (!IS_ALIGNED(bytes, PAGE_SIZE))
return ERR_PTR(-EINVAL);
/* FIXME: IOVMF_DA_FIXED should support 'superpages' */
if ((flags & IOVMF_LINEAR) && (flags & IOVMF_DA_ANON)) {
nr_entries = sgtable_nents(bytes);
if (!nr_entries)
return ERR_PTR(-EINVAL);
} else
nr_entries = bytes / PAGE_SIZE;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return ERR_PTR(-ENOMEM);
err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL);
if (err)
return ERR_PTR(err);
pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries);
return sgt;
}
/* free sg_table header(a kind of superblock) */
static void sgtable_free(struct sg_table *sgt)
{
if (!sgt)
return;
sg_free_table(sgt);
kfree(sgt);
pr_debug("%s: sgt:%p\n", __func__, sgt);
}
/* map 'sglist' to a contiguous mpu virtual area and return 'va' */
static void *vmap_sg(const struct sg_table *sgt)
{
u32 va;
size_t total;
unsigned int i;
struct scatterlist *sg;
struct vm_struct *new;
const struct mem_type *mtype;
mtype = get_mem_type(MT_DEVICE);
if (!mtype)
return ERR_PTR(-EINVAL);
total = sgtable_len(sgt);
if (!total)
return ERR_PTR(-EINVAL);
new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END);
if (!new)
return ERR_PTR(-ENOMEM);
va = (u32)new->addr;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes;
u32 pa;
int err;
pa = sg_phys(sg);
bytes = sg_dma_len(sg);
BUG_ON(bytes != PAGE_SIZE);
err = ioremap_page(va, pa, mtype);
if (err)
goto err_out;
va += bytes;
}
flush_cache_vmap(new->addr, total);
return new->addr;
err_out:
WARN_ON(1); /* FIXME: cleanup some mpu mappings */
vunmap(new->addr);
return ERR_PTR(-EAGAIN);
}
static inline void vunmap_sg(const void *va)
{
vunmap(va);
}
static struct iovm_struct *__find_iovm_area(struct iommu *obj, const u32 da)
{
struct iovm_struct *tmp;
list_for_each_entry(tmp, &obj->mmap, list) {
if ((da >= tmp->da_start) && (da < tmp->da_end)) {
size_t len;
len = tmp->da_end - tmp->da_start;
dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n",
__func__, tmp->da_start, da, tmp->da_end, len,
tmp->flags);
return tmp;
}
}
return NULL;
}
/**
* find_iovm_area - find iovma which includes @da
* @da: iommu device virtual address
*
* Find the existing iovma starting at @da
*/
struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da)
{
struct iovm_struct *area;
mutex_lock(&obj->mmap_lock);
area = __find_iovm_area(obj, da);
mutex_unlock(&obj->mmap_lock);
return area;
}
EXPORT_SYMBOL_GPL(find_iovm_area);
/*
* This finds the hole(area) which fits the requested address and len
* in iovmas mmap, and returns the new allocated iovma.
*/
static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
size_t bytes, u32 flags)
{
struct iovm_struct *new, *tmp;
u32 start, prev_end, alignement;
if (!obj || !bytes)
return ERR_PTR(-EINVAL);
start = da;
alignement = PAGE_SIZE;
if (flags & IOVMF_DA_ANON) {
/*
* Reserve the first page for NULL
*/
start = PAGE_SIZE;
if (flags & IOVMF_LINEAR)
alignement = iopgsz_max(bytes);
start = roundup(start, alignement);
}
tmp = NULL;
if (list_empty(&obj->mmap))
goto found;
prev_end = 0;
list_for_each_entry(tmp, &obj->mmap, list) {
if ((prev_end <= start) && (start + bytes < tmp->da_start))
goto found;
if (flags & IOVMF_DA_ANON)
start = roundup(tmp->da_end, alignement);
prev_end = tmp->da_end;
}
if ((start >= prev_end) && (ULONG_MAX - start >= bytes))
goto found;
dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n",
__func__, da, bytes, flags);
return ERR_PTR(-EINVAL);
found:
new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL);
if (!new)
return ERR_PTR(-ENOMEM);
new->iommu = obj;
new->da_start = start;
new->da_end = start + bytes;
new->flags = flags;
/*
* keep ascending order of iovmas
*/
if (tmp)
list_add_tail(&new->list, &tmp->list);
else
list_add(&new->list, &obj->mmap);
dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n",
__func__, new->da_start, start, new->da_end, bytes, flags);
return new;
}
static void free_iovm_area(struct iommu *obj, struct iovm_struct *area)
{
size_t bytes;
BUG_ON(!obj || !area);
bytes = area->da_end - area->da_start;
dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n",
__func__, area->da_start, area->da_end, bytes, area->flags);
list_del(&area->list);
kmem_cache_free(iovm_area_cachep, area);
}
/**
* da_to_va - convert (d) to (v)
* @obj: objective iommu
* @da: iommu device virtual address
* @va: mpu virtual address
*
* Returns mpu virtual addr which corresponds to a given device virtual addr
*/
void *da_to_va(struct iommu *obj, u32 da)
{
void *va = NULL;
struct iovm_struct *area;
mutex_lock(&obj->mmap_lock);
area = __find_iovm_area(obj, da);
if (!area) {
dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
goto out;
}
va = area->va;
mutex_unlock(&obj->mmap_lock);
out:
return va;
}
EXPORT_SYMBOL_GPL(da_to_va);
static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va)
{
unsigned int i;
struct scatterlist *sg;
void *va = _va;
void *va_end;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
struct page *pg;
const size_t bytes = PAGE_SIZE;
/*
* iommu 'superpage' isn't supported with 'iommu_vmalloc()'
*/
pg = vmalloc_to_page(va);
BUG_ON(!pg);
sg_set_page(sg, pg, bytes, 0);
va += bytes;
}
va_end = _va + PAGE_SIZE * i;
flush_cache_vmap(_va, va_end);
}
static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
{
/*
* Actually this is not necessary at all, just exists for
* consistency of the code readibility.
*/
BUG_ON(!sgt);
}
static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len)
{
unsigned int i;
struct scatterlist *sg;
void *va;
va = phys_to_virt(pa);
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes;
bytes = iopgsz_max(len);
BUG_ON(!iopgsz_ok(bytes));
sg_set_buf(sg, phys_to_virt(pa), bytes);
/*
* 'pa' is cotinuous(linear).
*/
pa += bytes;
len -= bytes;
}
BUG_ON(len);
clean_dcache_area(va, len);
}
static inline void sgtable_drain_kmalloc(struct sg_table *sgt)
{
/*
* Actually this is not necessary at all, just exists for
* consistency of the code readibility
*/
BUG_ON(!sgt);
}
/* create 'da' <-> 'pa' mapping from 'sgt' */
static int map_iovm_area(struct iommu *obj, struct iovm_struct *new,
const struct sg_table *sgt, u32 flags)
{
int err;
unsigned int i, j;
struct scatterlist *sg;
u32 da = new->da_start;
if (!obj || !new || !sgt)
return -EINVAL;
BUG_ON(!sgtable_ok(sgt));
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
u32 pa;
int pgsz;
size_t bytes;
struct iotlb_entry e;
pa = sg_phys(sg);
bytes = sg_dma_len(sg);
flags &= ~IOVMF_PGSZ_MASK;
pgsz = bytes_to_iopgsz(bytes);
if (pgsz < 0)
goto err_out;
flags |= pgsz;
pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
i, da, pa, bytes);
iotlb_init_entry(&e, da, pa, flags);
err = iopgtable_store_entry(obj, &e);
if (err)
goto err_out;
da += bytes;
}
return 0;
err_out:
da = new->da_start;
for_each_sg(sgt->sgl, sg, i, j) {
size_t bytes;
bytes = iopgtable_clear_entry(obj, da);
BUG_ON(!iopgsz_ok(bytes));
da += bytes;
}
return err;
}
/* release 'da' <-> 'pa' mapping */
static void unmap_iovm_area(struct iommu *obj, struct iovm_struct *area)
{
u32 start;
size_t total = area->da_end - area->da_start;
BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE));
start = area->da_start;
while (total > 0) {
size_t bytes;
bytes = iopgtable_clear_entry(obj, start);
if (bytes == 0)
bytes = PAGE_SIZE;
else
dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n",
__func__, start, bytes, area->flags);
BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
total -= bytes;
start += bytes;
}
BUG_ON(total);
}
/* template function for all unmapping */
static struct sg_table *unmap_vm_area(struct iommu *obj, const u32 da,
void (*fn)(const void *), u32 flags)
{
struct sg_table *sgt = NULL;
struct iovm_struct *area;
if (!IS_ALIGNED(da, PAGE_SIZE)) {
dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da);
return NULL;
}
mutex_lock(&obj->mmap_lock);
area = __find_iovm_area(obj, da);
if (!area) {
dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
goto out;
}
if ((area->flags & flags) != flags) {
dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__,
area->flags);
goto out;
}
sgt = (struct sg_table *)area->sgt;
unmap_iovm_area(obj, area);
fn(area->va);
dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__,
area->da_start, da, area->da_end,
area->da_end - area->da_start, area->flags);
free_iovm_area(obj, area);
out:
mutex_unlock(&obj->mmap_lock);
return sgt;
}
static u32 map_iommu_region(struct iommu *obj, u32 da,
const struct sg_table *sgt, void *va, size_t bytes, u32 flags)
{
int err = -ENOMEM;
struct iovm_struct *new;
mutex_lock(&obj->mmap_lock);
new = alloc_iovm_area(obj, da, bytes, flags);
if (IS_ERR(new)) {
err = PTR_ERR(new);
goto err_alloc_iovma;
}
new->va = va;
new->sgt = sgt;
if (map_iovm_area(obj, new, sgt, new->flags))
goto err_map;
mutex_unlock(&obj->mmap_lock);
dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n",
__func__, new->da_start, bytes, new->flags, va);
return new->da_start;
err_map:
free_iovm_area(obj, new);
err_alloc_iovma:
mutex_unlock(&obj->mmap_lock);
return err;
}
static inline u32 __iommu_vmap(struct iommu *obj, u32 da,
const struct sg_table *sgt, void *va, size_t bytes, u32 flags)
{
return map_iommu_region(obj, da, sgt, va, bytes, flags);
}
/**
* iommu_vmap - (d)-(p)-(v) address mapper
* @obj: objective iommu
* @sgt: address of scatter gather table
* @flags: iovma and page property
*
* Creates 1-n-1 mapping with given @sgt and returns @da.
* All @sgt element must be io page size aligned.
*/
u32 iommu_vmap(struct iommu *obj, u32 da, const struct sg_table *sgt,
u32 flags)
{
size_t bytes;
void *va;
if (!obj || !obj->dev || !sgt)
return -EINVAL;
bytes = sgtable_len(sgt);
if (!bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = vmap_sg(sgt);
if (IS_ERR(va))
return PTR_ERR(va);
flags &= IOVMF_HW_MASK;
flags |= IOVMF_DISCONT;
flags |= IOVMF_MMIO;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_vmap(obj, da, sgt, va, bytes, flags);
if (IS_ERR_VALUE(da))
vunmap_sg(va);
return da;
}
EXPORT_SYMBOL_GPL(iommu_vmap);
/**
* iommu_vunmap - release virtual mapping obtained by 'iommu_vmap()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Free the iommu virtually contiguous memory area starting at
* @da, which was returned by 'iommu_vmap()'.
*/
struct sg_table *iommu_vunmap(struct iommu *obj, u32 da)
{
struct sg_table *sgt;
/*
* 'sgt' is allocated before 'iommu_vmalloc()' is called.
* Just returns 'sgt' to the caller to free
*/
sgt = unmap_vm_area(obj, da, vunmap_sg, IOVMF_DISCONT | IOVMF_MMIO);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
return sgt;
}
EXPORT_SYMBOL_GPL(iommu_vunmap);
/**
* iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
* @obj: objective iommu
* @da: contiguous iommu virtual memory
* @bytes: allocation size
* @flags: iovma and page property
*
* Allocate @bytes linearly and creates 1-n-1 mapping and returns
* @da again, which might be adjusted if 'IOVMF_DA_ANON' is set.
*/
u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
{
void *va;
struct sg_table *sgt;
if (!obj || !obj->dev || !bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = vmalloc(bytes);
if (!va)
return -ENOMEM;
sgt = sgtable_alloc(bytes, flags);
if (IS_ERR(sgt)) {
da = PTR_ERR(sgt);
goto err_sgt_alloc;
}
sgtable_fill_vmalloc(sgt, va);
flags &= IOVMF_HW_MASK;
flags |= IOVMF_DISCONT;
flags |= IOVMF_ALLOC;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_vmap(obj, da, sgt, va, bytes, flags);
if (IS_ERR_VALUE(da))
goto err_iommu_vmap;
return da;
err_iommu_vmap:
sgtable_drain_vmalloc(sgt);
sgtable_free(sgt);
err_sgt_alloc:
vfree(va);
return da;
}
EXPORT_SYMBOL_GPL(iommu_vmalloc);
/**
* iommu_vfree - release memory allocated by 'iommu_vmalloc()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Frees the iommu virtually continuous memory area starting at
* @da, as obtained from 'iommu_vmalloc()'.
*/
void iommu_vfree(struct iommu *obj, const u32 da)
{
struct sg_table *sgt;
sgt = unmap_vm_area(obj, da, vfree, IOVMF_DISCONT | IOVMF_ALLOC);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
sgtable_free(sgt);
}
EXPORT_SYMBOL_GPL(iommu_vfree);
static u32 __iommu_kmap(struct iommu *obj, u32 da, u32 pa, void *va,
size_t bytes, u32 flags)
{
struct sg_table *sgt;
sgt = sgtable_alloc(bytes, flags);
if (IS_ERR(sgt))
return PTR_ERR(sgt);
sgtable_fill_kmalloc(sgt, pa, bytes);
da = map_iommu_region(obj, da, sgt, va, bytes, flags);
if (IS_ERR_VALUE(da)) {
sgtable_drain_kmalloc(sgt);
sgtable_free(sgt);
}
return da;
}
/**
* iommu_kmap - (d)-(p)-(v) address mapper
* @obj: objective iommu
* @da: contiguous iommu virtual memory
* @pa: contiguous physical memory
* @flags: iovma and page property
*
* Creates 1-1-1 mapping and returns @da again, which can be
* adjusted if 'IOVMF_DA_ANON' is set.
*/
u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
u32 flags)
{
void *va;
if (!obj || !obj->dev || !bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = ioremap(pa, bytes);
if (!va)
return -ENOMEM;
flags &= IOVMF_HW_MASK;
flags |= IOVMF_LINEAR;
flags |= IOVMF_MMIO;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_kmap(obj, da, pa, va, bytes, flags);
if (IS_ERR_VALUE(da))
iounmap(va);
return da;
}
EXPORT_SYMBOL_GPL(iommu_kmap);
/**
* iommu_kunmap - release virtual mapping obtained by 'iommu_kmap()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Frees the iommu virtually contiguous memory area starting at
* @da, which was passed to and was returned by'iommu_kmap()'.
*/
void iommu_kunmap(struct iommu *obj, u32 da)
{
struct sg_table *sgt;
typedef void (*func_t)(const void *);
sgt = unmap_vm_area(obj, da, (func_t)__iounmap,
IOVMF_LINEAR | IOVMF_MMIO);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
sgtable_free(sgt);
}
EXPORT_SYMBOL_GPL(iommu_kunmap);
/**
* iommu_kmalloc - (d)-(p)-(v) address allocator and mapper
* @obj: objective iommu
* @da: contiguous iommu virtual memory
* @bytes: bytes for allocation
* @flags: iovma and page property
*
* Allocate @bytes linearly and creates 1-1-1 mapping and returns
* @da again, which might be adjusted if 'IOVMF_DA_ANON' is set.
*/
u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
{
void *va;
u32 pa;
if (!obj || !obj->dev || !bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = kmalloc(bytes, GFP_KERNEL | GFP_DMA);
if (!va)
return -ENOMEM;
pa = virt_to_phys(va);
flags &= IOVMF_HW_MASK;
flags |= IOVMF_LINEAR;
flags |= IOVMF_ALLOC;
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
da = __iommu_kmap(obj, da, pa, va, bytes, flags);
if (IS_ERR_VALUE(da))
kfree(va);
return da;
}
EXPORT_SYMBOL_GPL(iommu_kmalloc);
/**
* iommu_kfree - release virtual mapping obtained by 'iommu_kmalloc()'
* @obj: objective iommu
* @da: iommu device virtual address
*
* Frees the iommu virtually contiguous memory area starting at
* @da, which was passed to and was returned by'iommu_kmalloc()'.
*/
void iommu_kfree(struct iommu *obj, u32 da)
{
struct sg_table *sgt;
sgt = unmap_vm_area(obj, da, kfree, IOVMF_LINEAR | IOVMF_ALLOC);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
sgtable_free(sgt);
}
EXPORT_SYMBOL_GPL(iommu_kfree);
static int __init iovmm_init(void)
{
const unsigned long flags = SLAB_HWCACHE_ALIGN;
struct kmem_cache *p;
p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0,
flags, NULL);
if (!p)
return -ENOMEM;
iovm_area_cachep = p;
return 0;
}
module_init(iovmm_init);
static void __exit iovmm_exit(void)
{
kmem_cache_destroy(iovm_area_cachep);
}
module_exit(iovmm_exit);
MODULE_DESCRIPTION("omap iommu: simple virtual address space management");
MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
MODULE_LICENSE("GPL v2");