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Merge branches 'x86/vt-d', 'x86/amd', 'arm/omap', 'ppc/pamu', 'arm/smmu', 'arm/exynos' and 'core' into next

Browse source
This commit is contained in:
Joerg Roedel 2014-07-31 20:29:02 +02:00
commit 4c5e9d9f0d
734 changed files with 6943 additions and 4599 deletions
Download patch file Download diff file Expand all files Collapse all files

13
drivers/iommu/Kconfig
View file

@ -76,7 +76,7 @@ config AMD_IOMMU_STATS
config AMD_IOMMU_V2
tristate "AMD IOMMU Version 2 driver"
depends on AMD_IOMMU && PROFILING
depends on AMD_IOMMU
select MMU_NOTIFIER
---help---
This option enables support for the AMD IOMMUv2 features of the IOMMU
@ -143,16 +143,12 @@ config OMAP_IOMMU
depends on ARCH_OMAP2PLUS
select IOMMU_API
config OMAP_IOVMM
tristate "OMAP IO Virtual Memory Manager Support"
depends on OMAP_IOMMU
config OMAP_IOMMU_DEBUG
tristate "Export OMAP IOMMU/IOVMM internals in DebugFS"
depends on OMAP_IOVMM && DEBUG_FS
tristate "Export OMAP IOMMU internals in DebugFS"
depends on OMAP_IOMMU && DEBUG_FS
help
Select this to see extensive information about
the internal state of OMAP IOMMU/IOVMM in debugfs.
the internal state of OMAP IOMMU in debugfs.
Say N unless you know you need this.
@ -180,6 +176,7 @@ config EXYNOS_IOMMU
bool "Exynos IOMMU Support"
depends on ARCH_EXYNOS
select IOMMU_API
select ARM_DMA_USE_IOMMU
help
Support for the IOMMU (System MMU) of Samsung Exynos application
processor family. This enables H/W multimedia accelerators to see

1
drivers/iommu/Makefile
View file

@ -12,7 +12,6 @@ obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o
obj-$(CONFIG_OMAP_IOMMU) += omap-iommu2.o
obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o
obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o

6
drivers/iommu/amd_iommu_types.h
View file

@ -390,12 +390,6 @@ struct amd_iommu_fault {
};
#define PPR_FAULT_EXEC (1 << 1)
#define PPR_FAULT_READ (1 << 2)
#define PPR_FAULT_WRITE (1 << 5)
#define PPR_FAULT_USER (1 << 6)
#define PPR_FAULT_RSVD (1 << 7)
#define PPR_FAULT_GN (1 << 8)
struct iommu_domain;

107
drivers/iommu/amd_iommu_v2.c
View file

@ -47,12 +47,13 @@ struct pasid_state {
atomic_t count; /* Reference count */
unsigned mmu_notifier_count; /* Counting nested mmu_notifier
calls */
struct task_struct *task; /* Task bound to this PASID */
struct mm_struct *mm; /* mm_struct for the faults */
struct mmu_notifier mn; /* mmu_otifier handle */
struct mmu_notifier mn; /* mmu_notifier handle */
struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */
struct device_state *device_state; /* Link to our device_state */
int pasid; /* PASID index */
bool invalid; /* Used during setup and
teardown of the pasid */
spinlock_t lock; /* Protect pri_queues and
mmu_notifer_count */
wait_queue_head_t wq; /* To wait for count == 0 */
@ -99,7 +100,6 @@ static struct workqueue_struct *iommu_wq;
static u64 *empty_page_table;
static void free_pasid_states(struct device_state *dev_state);
static void unbind_pasid(struct device_state *dev_state, int pasid);
static u16 device_id(struct pci_dev *pdev)
{
@ -297,37 +297,29 @@ static void put_pasid_state_wait(struct pasid_state *pasid_state)
schedule();
finish_wait(&pasid_state->wq, &wait);
mmput(pasid_state->mm);
free_pasid_state(pasid_state);
}
static void __unbind_pasid(struct pasid_state *pasid_state)
static void unbind_pasid(struct pasid_state *pasid_state)
{
struct iommu_domain *domain;
domain = pasid_state->device_state->domain;
/*
* Mark pasid_state as invalid, no more faults will we added to the
* work queue after this is visible everywhere.
*/
pasid_state->invalid = true;
/* Make sure this is visible */
smp_wmb();
/* After this the device/pasid can't access the mm anymore */
amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid);
clear_pasid_state(pasid_state->device_state, pasid_state->pasid);
/* Make sure no more pending faults are in the queue */
flush_workqueue(iommu_wq);
mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
put_pasid_state(pasid_state); /* Reference taken in bind() function */
}
static void unbind_pasid(struct device_state *dev_state, int pasid)
{
struct pasid_state *pasid_state;
pasid_state = get_pasid_state(dev_state, pasid);
if (pasid_state == NULL)
return;
__unbind_pasid(pasid_state);
put_pasid_state_wait(pasid_state); /* Reference taken in this function */
}
static void free_pasid_states_level1(struct pasid_state **tbl)
@ -373,6 +365,12 @@ static void free_pasid_states(struct device_state *dev_state)
* unbind the PASID
*/
mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
put_pasid_state_wait(pasid_state); /* Reference taken in
amd_iommu_bind_pasid */
/* Drop reference taken in amd_iommu_bind_pasid */
put_device_state(dev_state);
}
if (dev_state->pasid_levels == 2)
@ -411,14 +409,6 @@ static int mn_clear_flush_young(struct mmu_notifier *mn,
return 0;
}
static void mn_change_pte(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long address,
pte_t pte)
{
__mn_flush_page(mn, address);
}
static void mn_invalidate_page(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long address)
@ -472,22 +462,23 @@ static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct pasid_state *pasid_state;
struct device_state *dev_state;
bool run_inv_ctx_cb;
might_sleep();
pasid_state = mn_to_state(mn);
dev_state = pasid_state->device_state;
pasid_state = mn_to_state(mn);
dev_state = pasid_state->device_state;
run_inv_ctx_cb = !pasid_state->invalid;
if (pasid_state->device_state->inv_ctx_cb)
if (run_inv_ctx_cb && pasid_state->device_state->inv_ctx_cb)
dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid);
unbind_pasid(dev_state, pasid_state->pasid);
unbind_pasid(pasid_state);
}
static struct mmu_notifier_ops iommu_mn = {
.release = mn_release,
.clear_flush_young = mn_clear_flush_young,
.change_pte = mn_change_pte,
.invalidate_page = mn_invalidate_page,
.invalidate_range_start = mn_invalidate_range_start,
.invalidate_range_end = mn_invalidate_range_end,
@ -529,7 +520,7 @@ static void do_fault(struct work_struct *work)
write = !!(fault->flags & PPR_FAULT_WRITE);
down_read(&fault->state->mm->mmap_sem);
npages = get_user_pages(fault->state->task, fault->state->mm,
npages = get_user_pages(NULL, fault->state->mm,
fault->address, 1, write, 0, &page, NULL);
up_read(&fault->state->mm->mmap_sem);
@ -587,7 +578,7 @@ static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
goto out;
pasid_state = get_pasid_state(dev_state, iommu_fault->pasid);
if (pasid_state == NULL) {
if (pasid_state == NULL || pasid_state->invalid) {
/* We know the device but not the PASID -> send INVALID */
amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid,
PPR_INVALID, tag);
@ -612,6 +603,7 @@ static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
fault->state = pasid_state;
fault->tag = tag;
fault->finish = finish;
fault->pasid = iommu_fault->pasid;
fault->flags = iommu_fault->flags;
INIT_WORK(&fault->work, do_fault);
@ -620,6 +612,10 @@ static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
ret = NOTIFY_OK;
out_drop_state:
if (ret != NOTIFY_OK && pasid_state)
put_pasid_state(pasid_state);
put_device_state(dev_state);
out:
@ -635,6 +631,7 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
{
struct pasid_state *pasid_state;
struct device_state *dev_state;
struct mm_struct *mm;
u16 devid;
int ret;
@ -658,20 +655,23 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
if (pasid_state == NULL)
goto out;
atomic_set(&pasid_state->count, 1);
init_waitqueue_head(&pasid_state->wq);
spin_lock_init(&pasid_state->lock);
pasid_state->task = task;
pasid_state->mm = get_task_mm(task);
mm = get_task_mm(task);
pasid_state->mm = mm;
pasid_state->device_state = dev_state;
pasid_state->pasid = pasid;
pasid_state->invalid = true; /* Mark as valid only if we are
done with setting up the pasid */
pasid_state->mn.ops = &iommu_mn;
if (pasid_state->mm == NULL)
goto out_free;
mmu_notifier_register(&pasid_state->mn, pasid_state->mm);
mmu_notifier_register(&pasid_state->mn, mm);
ret = set_pasid_state(dev_state, pasid_state, pasid);
if (ret)
@ -682,15 +682,26 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
if (ret)
goto out_clear_state;
/* Now we are ready to handle faults */
pasid_state->invalid = false;
/*
* Drop the reference to the mm_struct here. We rely on the
* mmu_notifier release call-back to inform us when the mm
* is going away.
*/
mmput(mm);
return 0;
out_clear_state:
clear_pasid_state(dev_state, pasid);
out_unregister:
mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
mmu_notifier_unregister(&pasid_state->mn, mm);
out_free:
mmput(mm);
free_pasid_state(pasid_state);
out:
@ -728,10 +739,22 @@ void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid)
*/
put_pasid_state(pasid_state);
/* This will call the mn_release function and unbind the PASID */
/* Clear the pasid state so that the pasid can be re-used */
clear_pasid_state(dev_state, pasid_state->pasid);
/*
* Call mmu_notifier_unregister to drop our reference
* to pasid_state->mm
*/
mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
put_pasid_state_wait(pasid_state); /* Reference taken in
amd_iommu_bind_pasid */
out:
/* Drop reference taken in this function */
put_device_state(dev_state);
/* Drop reference taken in amd_iommu_bind_pasid */
put_device_state(dev_state);
}
EXPORT_SYMBOL(amd_iommu_unbind_pasid);

493
drivers/iommu/arm-smmu.c
View file

File diff suppressed because it is too large Load diff

10
drivers/iommu/fsl_pamu.c
View file

@ -92,7 +92,7 @@ struct gen_pool *spaace_pool;
* subwindow count per liodn.
*
*/
u32 pamu_get_max_subwin_cnt()
u32 pamu_get_max_subwin_cnt(void)
{
return max_subwindow_count;
}
@ -170,10 +170,10 @@ int pamu_disable_liodn(int liodn)
static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
{
/* Bug if not a power of 2 */
BUG_ON(!is_power_of_2(addrspace_size));
BUG_ON((addrspace_size & (addrspace_size - 1)));
/* window size is 2^(WSE+1) bytes */
return __ffs(addrspace_size) - 1;
return fls64(addrspace_size) - 2;
}
/* Derive the PAACE window count encoding for the subwindow count */
@ -351,7 +351,7 @@ int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
struct paace *ppaace;
unsigned long fspi;
if (!is_power_of_2(win_size) || win_size < PAMU_PAGE_SIZE) {
if ((win_size & (win_size - 1)) || win_size < PAMU_PAGE_SIZE) {
pr_debug("window size too small or not a power of two %llx\n", win_size);
return -EINVAL;
}
@ -464,7 +464,7 @@ int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin,
return -ENOENT;
}
if (!is_power_of_2(subwin_size) || subwin_size < PAMU_PAGE_SIZE) {
if ((subwin_size & (subwin_size - 1)) || subwin_size < PAMU_PAGE_SIZE) {
pr_debug("subwindow size out of range, or not a power of 2\n");
return -EINVAL;
}

23
drivers/iommu/fsl_pamu_domain.c
View file

@ -300,7 +300,7 @@ static int check_size(u64 size, dma_addr_t iova)
* Size must be a power of two and at least be equal
* to PAMU page size.
*/
if (!is_power_of_2(size) || size < PAMU_PAGE_SIZE) {
if ((size & (size - 1)) || size < PAMU_PAGE_SIZE) {
pr_debug("%s: size too small or not a power of two\n", __func__);
return -EINVAL;
}
@ -334,11 +334,6 @@ static struct fsl_dma_domain *iommu_alloc_dma_domain(void)
return domain;
}
static inline struct device_domain_info *find_domain(struct device *dev)
{
return dev->archdata.iommu_domain;
}
static void remove_device_ref(struct device_domain_info *info, u32 win_cnt)
{
unsigned long flags;
@ -379,7 +374,7 @@ static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct d
* Check here if the device is already attached to domain or not.
* If the device is already attached to a domain detach it.
*/
old_domain_info = find_domain(dev);
old_domain_info = dev->archdata.iommu_domain;
if (old_domain_info && old_domain_info->domain != dma_domain) {
spin_unlock_irqrestore(&device_domain_lock, flags);
detach_device(dev, old_domain_info->domain);
@ -398,7 +393,7 @@ static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct d
* the info for the first LIODN as all
* LIODNs share the same domain
*/
if (!old_domain_info)
if (!dev->archdata.iommu_domain)
dev->archdata.iommu_domain = info;
spin_unlock_irqrestore(&device_domain_lock, flags);
@ -978,12 +973,15 @@ static struct iommu_group *get_pci_device_group(struct pci_dev *pdev)
group = get_shared_pci_device_group(pdev);
}
if (!group)
group = ERR_PTR(-ENODEV);
return group;
}
static int fsl_pamu_add_device(struct device *dev)
{
struct iommu_group *group = NULL;
struct iommu_group *group = ERR_PTR(-ENODEV);
struct pci_dev *pdev;
const u32 *prop;
int ret, len;
@ -1006,7 +1004,7 @@ static int fsl_pamu_add_device(struct device *dev)
group = get_device_iommu_group(dev);
}
if (!group || IS_ERR(group))
if (IS_ERR(group))
return PTR_ERR(group);
ret = iommu_group_add_device(group, dev);
@ -1054,8 +1052,7 @@ static int fsl_pamu_set_windows(struct iommu_domain *domain, u32 w_count)
ret = pamu_set_domain_geometry(dma_domain, &domain->geometry,
((w_count > 1) ? w_count : 0));
if (!ret) {
if (dma_domain->win_arr)
kfree(dma_domain->win_arr);
kfree(dma_domain->win_arr);
dma_domain->win_arr = kzalloc(sizeof(struct dma_window) *
w_count, GFP_ATOMIC);
if (!dma_domain->win_arr) {
@ -1093,7 +1090,7 @@ static const struct iommu_ops fsl_pamu_ops = {
.remove_device = fsl_pamu_remove_device,
};
int pamu_domain_init()
int pamu_domain_init(void)
{
int ret = 0;

114
drivers/iommu/omap-iommu-debug.c
View file

@ -213,116 +213,6 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
return bytes;
}
static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
char *p, *buf;
struct iovm_struct *tmp;
int uninitialized_var(i);
ssize_t bytes;
buf = (char *)__get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n",
"No", "start", "end", "size", "flags");
p += sprintf(p, "-------------------------------------------------\n");
mutex_lock(&iommu_debug_lock);
list_for_each_entry(tmp, &obj->mmap, list) {
size_t len;
const char *str = "%3d %08x-%08x %6x %8x\n";
const int maxcol = 39;
len = tmp->da_end - tmp->da_start;
p += snprintf(p, maxcol, str,
i, tmp->da_start, tmp->da_end, len, tmp->flags);
if (PAGE_SIZE - (p - buf) < maxcol)
break;
i++;
}
bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
mutex_unlock(&iommu_debug_lock);
free_page((unsigned long)buf);
return bytes;
}
static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct device *dev = file->private_data;
char *p, *buf;
struct iovm_struct *area;
ssize_t bytes;
count = min_t(ssize_t, count, PAGE_SIZE);
buf = (char *)__get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
mutex_lock(&iommu_debug_lock);
area = omap_find_iovm_area(dev, (u32)ppos);
if (!area) {
bytes = -EINVAL;
goto err_out;
}
memcpy(p, area->va, count);
p += count;
bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
err_out:
mutex_unlock(&iommu_debug_lock);
free_page((unsigned long)buf);
return bytes;
}
static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct device *dev = file->private_data;
struct iovm_struct *area;
char *p, *buf;
count = min_t(size_t, count, PAGE_SIZE);
buf = (char *)__get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
mutex_lock(&iommu_debug_lock);
if (copy_from_user(p, userbuf, count)) {
count = -EFAULT;
goto err_out;
}
area = omap_find_iovm_area(dev, (u32)ppos);
if (!area) {
count = -EINVAL;
goto err_out;
}
memcpy(area->va, p, count);
err_out:
mutex_unlock(&iommu_debug_lock);
free_page((unsigned long)buf);
return count;
}
#define DEBUG_FOPS(name) \
static const struct file_operations debug_##name##_fops = { \
.open = simple_open, \
@ -342,8 +232,6 @@ DEBUG_FOPS_RO(ver);
DEBUG_FOPS_RO(regs);
DEBUG_FOPS_RO(tlb);
DEBUG_FOPS(pagetable);
DEBUG_FOPS_RO(mmap);
DEBUG_FOPS(mem);
#define __DEBUG_ADD_FILE(attr, mode) \
{ \
@ -389,8 +277,6 @@ static int iommu_debug_register(struct device *dev, void *data)
DEBUG_ADD_FILE_RO(regs);
DEBUG_ADD_FILE_RO(tlb);
DEBUG_ADD_FILE(pagetable);
DEBUG_ADD_FILE_RO(mmap);
DEBUG_ADD_FILE(mem);
return 0;

13
drivers/iommu/omap-iommu.c
View file

@ -959,31 +959,18 @@ static int omap_iommu_probe(struct platform_device *pdev)
return err;
if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8)
return -EINVAL;
/*
* da_start and da_end are needed for omap-iovmm, so hardcode
* these values as used by OMAP3 ISP - the only user for
* omap-iovmm
*/
obj->da_start = 0;
obj->da_end = 0xfffff000;
if (of_find_property(of, "ti,iommu-bus-err-back", NULL))
obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN;
} else {
obj->nr_tlb_entries = pdata->nr_tlb_entries;
obj->name = pdata->name;
obj->da_start = pdata->da_start;
obj->da_end = pdata->da_end;
}
if (obj->da_end <= obj->da_start)
return -EINVAL;
obj->dev = &pdev->dev;
obj->ctx = (void *)obj + sizeof(*obj);
spin_lock_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);
obj->regbase = devm_ioremap_resource(obj->dev, res);

8
drivers/iommu/omap-iommu.h
View file

@ -46,12 +46,7 @@ struct omap_iommu {
int nr_tlb_entries;
struct list_head mmap;
struct mutex mmap_lock; /* protect mmap */
void *ctx; /* iommu context: registres saved area */
u32 da_start;
u32 da_end;
int has_bus_err_back;
};
@ -154,9 +149,12 @@ static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
#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_LITTLE (0 << MMU_RAM_ENDIAN_SHIFT)
#define MMU_RAM_ENDIAN_BIG (1 << 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)

791
drivers/iommu/omap-iovmm.c
View file

@ -1,791 +0,0 @@
/*
* 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/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/device.h>
#include <linux/scatterlist.h>
#include <linux/iommu.h>
#include <linux/omap-iommu.h>
#include <linux/platform_data/iommu-omap.h>
#include <asm/cacheflush.h>
#include <asm/mach/map.h>
#include "omap-iopgtable.h"
#include "omap-iommu.h"
/*
* 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
/*
* 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_ELSZ_MASK (3 << 7)
#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))
static struct kmem_cache *iovm_area_cachep;
/* return the offset of the first scatterlist entry in a sg table */
static unsigned int sgtable_offset(const struct sg_table *sgt)
{
if (!sgt || !sgt->nents)
return 0;
return sgt->sgl->offset;
}
/* 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->length + sg->offset;
if (!iopgsz_ok(bytes)) {
pr_err("%s: sg[%d] not iommu pagesize(%u %u)\n",
__func__, i, bytes, sg->offset);
return 0;
}
if (i && sg->offset) {
pr_err("%s: sg[%d] offset not allowed in internal entries\n",
__func__, i);
return 0;
}
total += bytes;
}
return total;
}
#define sgtable_ok(x) (!!sgtable_len(x))
static unsigned max_alignment(u32 addr)
{
int i;
unsigned pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
for (i = 0; i < ARRAY_SIZE(pagesize) && addr & (pagesize[i] - 1); i++)
;
return (i < ARRAY_SIZE(pagesize)) ? pagesize[i] : 0;
}
/*
* calculate the optimal number sg elements from total bytes based on
* iommu superpages
*/
static unsigned sgtable_nents(size_t bytes, u32 da, u32 pa)
{
unsigned nr_entries = 0, ent_sz;
if (!IS_ALIGNED(bytes, PAGE_SIZE)) {
pr_err("%s: wrong size %08x\n", __func__, bytes);
return 0;
}
while (bytes) {
ent_sz = max_alignment(da | pa);
ent_sz = min_t(unsigned, ent_sz, iopgsz_max(bytes));
nr_entries++;
da += ent_sz;
pa += ent_sz;
bytes -= ent_sz;
}
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,
u32 da, u32 pa)
{
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);
if (flags & IOVMF_LINEAR) {
nr_entries = sgtable_nents(bytes, da, pa);
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) {
kfree(sgt);
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) - sg->offset;
bytes = sg->length + sg->offset;
BUG_ON(bytes != PAGE_SIZE);
err = ioremap_page(va, pa, mtype);
if (err)
goto err_out;
va += bytes;
}
flush_cache_vmap((unsigned long)new->addr,
(unsigned long)(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 omap_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;
}
/**
* omap_find_iovm_area - find iovma which includes @da
* @dev: client device
* @da: iommu device virtual address
*
* Find the existing iovma starting at @da
*/
struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da)
{
struct omap_iommu *obj = dev_to_omap_iommu(dev);
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(omap_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 omap_iommu *obj, u32 da,
size_t bytes, u32 flags)
{
struct iovm_struct *new, *tmp;
u32 start, prev_end, alignment;
if (!obj || !bytes)
return ERR_PTR(-EINVAL);
start = da;
alignment = PAGE_SIZE;
if (~flags & IOVMF_DA_FIXED) {
/* Don't map address 0 */
start = obj->da_start ? obj->da_start : alignment;
if (flags & IOVMF_LINEAR)
alignment = iopgsz_max(bytes);
start = roundup(start, alignment);
} else if (start < obj->da_start || start > obj->da_end ||
obj->da_end - start < bytes) {
return ERR_PTR(-EINVAL);
}
tmp = NULL;
if (list_empty(&obj->mmap))
goto found;
prev_end = 0;
list_for_each_entry(tmp, &obj->mmap, list) {
if (prev_end > start)
break;
if (tmp->da_start > start && (tmp->da_start - start) >= bytes)
goto found;
if (tmp->da_end >= start && ~flags & IOVMF_DA_FIXED)
start = roundup(tmp->da_end + 1, alignment);
prev_end = tmp->da_end;
}
if ((start >= prev_end) && (obj->da_end - 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 omap_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);
}
/**
* omap_da_to_va - convert (d) to (v)
* @dev: client device
* @da: iommu device virtual address
* @va: mpu virtual address
*
* Returns mpu virtual addr which corresponds to a given device virtual addr
*/
void *omap_da_to_va(struct device *dev, u32 da)
{
struct omap_iommu *obj = dev_to_omap_iommu(dev);
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;
out:
mutex_unlock(&obj->mmap_lock);
return va;
}
EXPORT_SYMBOL_GPL(omap_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 'omap_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;
}
static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
{
/*
* Actually this is not necessary at all, just exists for
* consistency of the code readability.
*/
BUG_ON(!sgt);
}
/* create 'da' <-> 'pa' mapping from 'sgt' */
static int map_iovm_area(struct iommu_domain *domain, 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 (!domain || !sgt)
return -EINVAL;
BUG_ON(!sgtable_ok(sgt));
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
u32 pa;
size_t bytes;
pa = sg_phys(sg) - sg->offset;
bytes = sg->length + sg->offset;
flags &= ~IOVMF_PGSZ_MASK;
if (bytes_to_iopgsz(bytes) < 0)
goto err_out;
pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
i, da, pa, bytes);
err = iommu_map(domain, da, pa, bytes, flags);
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 = sg->length + sg->offset;
/* ignore failures.. we're already handling one */
iommu_unmap(domain, da, bytes);
da += bytes;
}
return err;
}
/* release 'da' <-> 'pa' mapping */
static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj,
struct iovm_struct *area)
{
u32 start;
size_t total = area->da_end - area->da_start;
const struct sg_table *sgt = area->sgt;
struct scatterlist *sg;
int i;
size_t unmapped;
BUG_ON(!sgtable_ok(sgt));
BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE));
start = area->da_start;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes;
bytes = sg->length + sg->offset;
unmapped = iommu_unmap(domain, start, bytes);
if (unmapped < bytes)
break;
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_domain *domain,
struct omap_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(domain, 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_domain *domain, struct omap_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(domain, 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_domain *domain, struct omap_iommu *obj,
u32 da, const struct sg_table *sgt,
void *va, size_t bytes, u32 flags)
{
return map_iommu_region(domain, obj, da, sgt, va, bytes, flags);
}
/**
* omap_iommu_vmap - (d)-(p)-(v) address mapper
* @domain: iommu domain
* @dev: client device
* @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 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
const struct sg_table *sgt, u32 flags)
{
struct omap_iommu *obj = dev_to_omap_iommu(dev);
size_t bytes;
void *va = NULL;
if (!obj || !obj->dev || !sgt)
return -EINVAL;
bytes = sgtable_len(sgt);
if (!bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
if (flags & IOVMF_MMIO) {
va = vmap_sg(sgt);
if (IS_ERR(va))
return PTR_ERR(va);
}
flags |= IOVMF_DISCONT;
flags |= IOVMF_MMIO;
da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags);
if (IS_ERR_VALUE(da))
vunmap_sg(va);
return da + sgtable_offset(sgt);
}
EXPORT_SYMBOL_GPL(omap_iommu_vmap);
/**
* omap_iommu_vunmap - release virtual mapping obtained by 'omap_iommu_vmap()'
* @domain: iommu domain
* @dev: client device
* @da: iommu device virtual address
*
* Free the iommu virtually contiguous memory area starting at
* @da, which was returned by 'omap_iommu_vmap()'.
*/
struct sg_table *
omap_iommu_vunmap(struct iommu_domain *domain, struct device *dev, u32 da)
{
struct omap_iommu *obj = dev_to_omap_iommu(dev);
struct sg_table *sgt;
/*
* 'sgt' is allocated before 'omap_iommu_vmalloc()' is called.
* Just returns 'sgt' to the caller to free
*/
da &= PAGE_MASK;
sgt = unmap_vm_area(domain, obj, da, vunmap_sg,
IOVMF_DISCONT | IOVMF_MMIO);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
return sgt;
}
EXPORT_SYMBOL_GPL(omap_iommu_vunmap);
/**
* omap_iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
* @dev: client device
* @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_FIXED' is not set.
*/
u32
omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev, u32 da,
size_t bytes, u32 flags)
{
struct omap_iommu *obj = dev_to_omap_iommu(dev);
void *va;
struct sg_table *sgt;
if (!obj || !obj->dev || !bytes)
return -EINVAL;
bytes = PAGE_ALIGN(bytes);
va = vmalloc(bytes);
if (!va)
return -ENOMEM;
flags |= IOVMF_DISCONT;
flags |= IOVMF_ALLOC;
sgt = sgtable_alloc(bytes, flags, da, 0);
if (IS_ERR(sgt)) {
da = PTR_ERR(sgt);
goto err_sgt_alloc;
}
sgtable_fill_vmalloc(sgt, va);
da = __iommu_vmap(domain, 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(omap_iommu_vmalloc);
/**
* omap_iommu_vfree - release memory allocated by 'omap_iommu_vmalloc()'
* @dev: client device
* @da: iommu device virtual address
*
* Frees the iommu virtually continuous memory area starting at
* @da, as obtained from 'omap_iommu_vmalloc()'.
*/
void omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
const u32 da)
{
struct omap_iommu *obj = dev_to_omap_iommu(dev);
struct sg_table *sgt;
sgt = unmap_vm_area(domain, obj, da, vfree,
IOVMF_DISCONT | IOVMF_ALLOC);
if (!sgt)
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
sgtable_free(sgt);
}
EXPORT_SYMBOL_GPL(omap_iommu_vfree);
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 <[email protected]>");
MODULE_LICENSE("GPL v2");