linux/drivers/iommu/s390-iommu.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

386 lines
9.5 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* IOMMU API for s390 PCI devices
*
* Copyright IBM Corp. 2015
* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
*/
#include <linux/pci.h>
#include <linux/iommu.h>
#include <linux/iommu-helper.h>
#include <linux/sizes.h>
#include <asm/pci_dma.h>
/*
* Physically contiguous memory regions can be mapped with 4 KiB alignment,
* we allow all page sizes that are an order of 4KiB (no special large page
* support so far).
*/
#define S390_IOMMU_PGSIZES (~0xFFFUL)
static const struct iommu_ops s390_iommu_ops;
struct s390_domain {
struct iommu_domain domain;
struct list_head devices;
unsigned long *dma_table;
spinlock_t dma_table_lock;
spinlock_t list_lock;
};
struct s390_domain_device {
struct list_head list;
struct zpci_dev *zdev;
};
static struct s390_domain *to_s390_domain(struct iommu_domain *dom)
{
return container_of(dom, struct s390_domain, domain);
}
static bool s390_iommu_capable(enum iommu_cap cap)
{
switch (cap) {
case IOMMU_CAP_CACHE_COHERENCY:
return true;
case IOMMU_CAP_INTR_REMAP:
return true;
default:
return false;
}
}
static struct iommu_domain *s390_domain_alloc(unsigned domain_type)
{
struct s390_domain *s390_domain;
if (domain_type != IOMMU_DOMAIN_UNMANAGED)
return NULL;
s390_domain = kzalloc(sizeof(*s390_domain), GFP_KERNEL);
if (!s390_domain)
return NULL;
s390_domain->dma_table = dma_alloc_cpu_table();
if (!s390_domain->dma_table) {
kfree(s390_domain);
return NULL;
}
spin_lock_init(&s390_domain->dma_table_lock);
spin_lock_init(&s390_domain->list_lock);
INIT_LIST_HEAD(&s390_domain->devices);
return &s390_domain->domain;
}
static void s390_domain_free(struct iommu_domain *domain)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
dma_cleanup_tables(s390_domain->dma_table);
kfree(s390_domain);
}
static int s390_iommu_attach_device(struct iommu_domain *domain,
struct device *dev)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
struct s390_domain_device *domain_device;
unsigned long flags;
int rc;
if (!zdev)
return -ENODEV;
domain_device = kzalloc(sizeof(*domain_device), GFP_KERNEL);
if (!domain_device)
return -ENOMEM;
if (zdev->dma_table)
zpci_dma_exit_device(zdev);
zdev->dma_table = s390_domain->dma_table;
rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
(u64) zdev->dma_table);
if (rc)
goto out_restore;
spin_lock_irqsave(&s390_domain->list_lock, flags);
/* First device defines the DMA range limits */
if (list_empty(&s390_domain->devices)) {
domain->geometry.aperture_start = zdev->start_dma;
domain->geometry.aperture_end = zdev->end_dma;
domain->geometry.force_aperture = true;
/* Allow only devices with identical DMA range limits */
} else if (domain->geometry.aperture_start != zdev->start_dma ||
domain->geometry.aperture_end != zdev->end_dma) {
rc = -EINVAL;
spin_unlock_irqrestore(&s390_domain->list_lock, flags);
goto out_restore;
}
domain_device->zdev = zdev;
zdev->s390_domain = s390_domain;
list_add(&domain_device->list, &s390_domain->devices);
spin_unlock_irqrestore(&s390_domain->list_lock, flags);
return 0;
out_restore:
zpci_dma_init_device(zdev);
kfree(domain_device);
return rc;
}
static void s390_iommu_detach_device(struct iommu_domain *domain,
struct device *dev)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
struct s390_domain_device *domain_device, *tmp;
unsigned long flags;
int found = 0;
if (!zdev)
return;
spin_lock_irqsave(&s390_domain->list_lock, flags);
list_for_each_entry_safe(domain_device, tmp, &s390_domain->devices,
list) {
if (domain_device->zdev == zdev) {
list_del(&domain_device->list);
kfree(domain_device);
found = 1;
break;
}
}
spin_unlock_irqrestore(&s390_domain->list_lock, flags);
if (found) {
zdev->s390_domain = NULL;
zpci_unregister_ioat(zdev, 0);
zpci_dma_init_device(zdev);
}
}
static int s390_iommu_add_device(struct device *dev)
{
struct iommu_group *group = iommu_group_get_for_dev(dev);
struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
if (IS_ERR(group))
return PTR_ERR(group);
iommu_group_put(group);
iommu_device_link(&zdev->iommu_dev, dev);
return 0;
}
static void s390_iommu_remove_device(struct device *dev)
{
struct zpci_dev *zdev = to_pci_dev(dev)->sysdata;
struct iommu_domain *domain;
/*
* This is a workaround for a scenario where the IOMMU API common code
* "forgets" to call the detach_dev callback: After binding a device
* to vfio-pci and completing the VFIO_SET_IOMMU ioctl (which triggers
* the attach_dev), removing the device via
* "echo 1 > /sys/bus/pci/devices/.../remove" won't trigger detach_dev,
* only remove_device will be called via the BUS_NOTIFY_REMOVED_DEVICE
* notifier.
*
* So let's call detach_dev from here if it hasn't been called before.
*/
if (zdev && zdev->s390_domain) {
domain = iommu_get_domain_for_dev(dev);
if (domain)
s390_iommu_detach_device(domain, dev);
}
iommu_device_unlink(&zdev->iommu_dev, dev);
iommu_group_remove_device(dev);
}
static int s390_iommu_update_trans(struct s390_domain *s390_domain,
unsigned long pa, dma_addr_t dma_addr,
size_t size, int flags)
{
struct s390_domain_device *domain_device;
u8 *page_addr = (u8 *) (pa & PAGE_MASK);
dma_addr_t start_dma_addr = dma_addr;
unsigned long irq_flags, nr_pages, i;
unsigned long *entry;
int rc = 0;
if (dma_addr < s390_domain->domain.geometry.aperture_start ||
dma_addr + size > s390_domain->domain.geometry.aperture_end)
return -EINVAL;
nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
if (!nr_pages)
return 0;
spin_lock_irqsave(&s390_domain->dma_table_lock, irq_flags);
for (i = 0; i < nr_pages; i++) {
entry = dma_walk_cpu_trans(s390_domain->dma_table, dma_addr);
if (!entry) {
rc = -ENOMEM;
goto undo_cpu_trans;
}
dma_update_cpu_trans(entry, page_addr, flags);
page_addr += PAGE_SIZE;
dma_addr += PAGE_SIZE;
}
spin_lock(&s390_domain->list_lock);
list_for_each_entry(domain_device, &s390_domain->devices, list) {
rc = zpci_refresh_trans((u64) domain_device->zdev->fh << 32,
start_dma_addr, nr_pages * PAGE_SIZE);
if (rc)
break;
}
spin_unlock(&s390_domain->list_lock);
undo_cpu_trans:
if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID)) {
flags = ZPCI_PTE_INVALID;
while (i-- > 0) {
page_addr -= PAGE_SIZE;
dma_addr -= PAGE_SIZE;
entry = dma_walk_cpu_trans(s390_domain->dma_table,
dma_addr);
if (!entry)
break;
dma_update_cpu_trans(entry, page_addr, flags);
}
}
spin_unlock_irqrestore(&s390_domain->dma_table_lock, irq_flags);
return rc;
}
static int s390_iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
int flags = ZPCI_PTE_VALID, rc = 0;
if (!(prot & IOMMU_READ))
return -EINVAL;
if (!(prot & IOMMU_WRITE))
flags |= ZPCI_TABLE_PROTECTED;
rc = s390_iommu_update_trans(s390_domain, (unsigned long) paddr, iova,
size, flags);
return rc;
}
static phys_addr_t s390_iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
unsigned long *sto, *pto, *rto, flags;
unsigned int rtx, sx, px;
phys_addr_t phys = 0;
if (iova < domain->geometry.aperture_start ||
iova > domain->geometry.aperture_end)
return 0;
rtx = calc_rtx(iova);
sx = calc_sx(iova);
px = calc_px(iova);
rto = s390_domain->dma_table;
spin_lock_irqsave(&s390_domain->dma_table_lock, flags);
if (rto && reg_entry_isvalid(rto[rtx])) {
sto = get_rt_sto(rto[rtx]);
if (sto && reg_entry_isvalid(sto[sx])) {
pto = get_st_pto(sto[sx]);
if (pto && pt_entry_isvalid(pto[px]))
phys = pto[px] & ZPCI_PTE_ADDR_MASK;
}
}
spin_unlock_irqrestore(&s390_domain->dma_table_lock, flags);
return phys;
}
static size_t s390_iommu_unmap(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
int flags = ZPCI_PTE_INVALID;
phys_addr_t paddr;
int rc;
paddr = s390_iommu_iova_to_phys(domain, iova);
if (!paddr)
return 0;
rc = s390_iommu_update_trans(s390_domain, (unsigned long) paddr, iova,
size, flags);
if (rc)
return 0;
return size;
}
int zpci_init_iommu(struct zpci_dev *zdev)
{
int rc = 0;
rc = iommu_device_sysfs_add(&zdev->iommu_dev, NULL, NULL,
"s390-iommu.%08x", zdev->fid);
if (rc)
goto out_err;
iommu_device_set_ops(&zdev->iommu_dev, &s390_iommu_ops);
rc = iommu_device_register(&zdev->iommu_dev);
if (rc)
goto out_sysfs;
return 0;
out_sysfs:
iommu_device_sysfs_remove(&zdev->iommu_dev);
out_err:
return rc;
}
void zpci_destroy_iommu(struct zpci_dev *zdev)
{
iommu_device_unregister(&zdev->iommu_dev);
iommu_device_sysfs_remove(&zdev->iommu_dev);
}
static const struct iommu_ops s390_iommu_ops = {
.capable = s390_iommu_capable,
.domain_alloc = s390_domain_alloc,
.domain_free = s390_domain_free,
.attach_dev = s390_iommu_attach_device,
.detach_dev = s390_iommu_detach_device,
.map = s390_iommu_map,
.unmap = s390_iommu_unmap,
.iova_to_phys = s390_iommu_iova_to_phys,
.add_device = s390_iommu_add_device,
.remove_device = s390_iommu_remove_device,
.device_group = generic_device_group,
.pgsize_bitmap = S390_IOMMU_PGSIZES,
};
static int __init s390_iommu_init(void)
{
return bus_set_iommu(&pci_bus_type, &s390_iommu_ops);
}
subsys_initcall(s390_iommu_init);