linux/arch/alpha/kernel/pci-sysfs.c

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/*
* arch/alpha/kernel/pci-sysfs.c
*
* Copyright (C) 2009 Ivan Kokshaysky
*
* Alpha PCI resource files.
*
* Loosely based on generic HAVE_PCI_MMAP implementation in
* drivers/pci/pci-sysfs.c
*/
#include <linux/sched.h>
#include <linux/stat.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
#include <linux/slab.h>
#include <linux/pci.h>
static int hose_mmap_page_range(struct pci_controller *hose,
struct vm_area_struct *vma,
enum pci_mmap_state mmap_type, int sparse)
{
unsigned long base;
if (mmap_type == pci_mmap_mem)
base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
else
base = sparse ? hose->sparse_io_base : hose->dense_io_base;
vma->vm_pgoff += base >> PAGE_SHIFT;
return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
static int __pci_mmap_fits(struct pci_dev *pdev, int num,
struct vm_area_struct *vma, int sparse)
{
unsigned long nr, start, size;
int shift = sparse ? 5 : 0;
nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
start = vma->vm_pgoff;
size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;
if (start < size && size - start >= nr)
return 1;
WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
"(size 0x%08lx)\n",
current->comm, sparse ? " sparse" : "", start, start + nr,
pci_name(pdev), num, size);
return 0;
}
/**
* pci_mmap_resource - map a PCI resource into user memory space
* @kobj: kobject for mapping
* @attr: struct bin_attribute for the file being mapped
* @vma: struct vm_area_struct passed into the mmap
* @sparse: address space type
*
* Use the bus mapping routines to map a PCI resource into userspace.
*/
static int pci_mmap_resource(struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma, int sparse)
{
struct pci_dev *pdev = to_pci_dev(container_of(kobj,
struct device, kobj));
struct resource *res = attr->private;
enum pci_mmap_state mmap_type;
struct pci_bus_region bar;
int i;
for (i = 0; i < PCI_ROM_RESOURCE; i++)
if (res == &pdev->resource[i])
break;
if (i >= PCI_ROM_RESOURCE)
return -ENODEV;
if (!__pci_mmap_fits(pdev, i, vma, sparse))
return -EINVAL;
if (iomem_is_exclusive(res->start))
return -EINVAL;
pcibios_resource_to_bus(pdev->bus, &bar, res);
vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
}
static int pci_mmap_resource_sparse(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma)
{
return pci_mmap_resource(kobj, attr, vma, 1);
}
static int pci_mmap_resource_dense(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
struct vm_area_struct *vma)
{
return pci_mmap_resource(kobj, attr, vma, 0);
}
/**
* pci_remove_resource_files - cleanup resource files
* @dev: dev to cleanup
*
* If we created resource files for @dev, remove them from sysfs and
* free their resources.
*/
void pci_remove_resource_files(struct pci_dev *pdev)
{
int i;
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
struct bin_attribute *res_attr;
res_attr = pdev->res_attr[i];
if (res_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
kfree(res_attr);
}
res_attr = pdev->res_attr_wc[i];
if (res_attr) {
sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
kfree(res_attr);
}
}
}
static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
{
struct pci_bus_region bar;
struct pci_controller *hose = pdev->sysdata;
long dense_offset;
unsigned long sparse_size;
pcibios_resource_to_bus(pdev->bus, &bar, &pdev->resource[num]);
/* All core logic chips have 4G sparse address space, except
CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
definitions in asm/core_xxx.h files). This corresponds
to 128M or 512M of the bus space. */
dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;
return bar.end < sparse_size;
}
static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name,
char *suffix, struct bin_attribute *res_attr,
unsigned long sparse)
{
size_t size = pci_resource_len(pdev, num);
sprintf(name, "resource%d%s", num, suffix);
res_attr->mmap = sparse ? pci_mmap_resource_sparse :
pci_mmap_resource_dense;
res_attr->attr.name = name;
res_attr->attr.mode = S_IRUSR | S_IWUSR;
res_attr->size = sparse ? size << 5 : size;
res_attr->private = &pdev->resource[num];
return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
}
static int pci_create_attr(struct pci_dev *pdev, int num)
{
/* allocate attribute structure, piggyback attribute name */
int retval, nlen1, nlen2 = 0, res_count = 1;
unsigned long sparse_base, dense_base;
struct bin_attribute *attr;
struct pci_controller *hose = pdev->sysdata;
char *suffix, *attr_name;
suffix = ""; /* Assume bwx machine, normal resourceN files. */
nlen1 = 10;
if (pdev->resource[num].flags & IORESOURCE_MEM) {
sparse_base = hose->sparse_mem_base;
dense_base = hose->dense_mem_base;
if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
sparse_base = 0;
suffix = "_dense";
nlen1 = 16; /* resourceN_dense */
}
} else {
sparse_base = hose->sparse_io_base;
dense_base = hose->dense_io_base;
}
if (sparse_base) {
suffix = "_sparse";
nlen1 = 17;
if (dense_base) {
nlen2 = 16; /* resourceN_dense */
res_count = 2;
}
}
attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
if (!attr)
return -ENOMEM;
/* Create bwx, sparse or single dense file */
attr_name = (char *)(attr + res_count);
pdev->res_attr[num] = attr;
retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
sparse_base);
if (retval || res_count == 1)
return retval;
/* Create dense file */
attr_name += nlen1;
attr++;
pdev->res_attr_wc[num] = attr;
return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
}
/**
* pci_create_resource_files - create resource files in sysfs for @dev
* @dev: dev in question
*
* Walk the resources in @dev creating files for each resource available.
*/
int pci_create_resource_files(struct pci_dev *pdev)
{
int i;
int retval;
/* Expose the PCI resources from this device as files */
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
/* skip empty resources */
if (!pci_resource_len(pdev, i))
continue;
retval = pci_create_attr(pdev, i);
if (retval) {
pci_remove_resource_files(pdev);
return retval;
}
}
return 0;
}
/* Legacy I/O bus mapping stuff. */
static int __legacy_mmap_fits(struct pci_controller *hose,
struct vm_area_struct *vma,
unsigned long res_size, int sparse)
{
unsigned long nr, start, size;
nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
start = vma->vm_pgoff;
size = ((res_size - 1) >> PAGE_SHIFT) + 1;
if (start < size && size - start >= nr)
return 1;
WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
"(size 0x%08lx)\n",
current->comm, sparse ? " sparse" : "", start, start + nr,
hose->index, size);
return 0;
}
static inline int has_sparse(struct pci_controller *hose,
enum pci_mmap_state mmap_type)
{
unsigned long base;
base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
hose->sparse_io_base;
return base != 0;
}
int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
enum pci_mmap_state mmap_type)
{
struct pci_controller *hose = bus->sysdata;
int sparse = has_sparse(hose, mmap_type);
unsigned long res_size;
res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
bus->legacy_io->size;
if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
return -EINVAL;
return hose_mmap_page_range(hose, vma, mmap_type, sparse);
}
/**
* pci_adjust_legacy_attr - adjustment of legacy file attributes
* @b: bus to create files under
* @mmap_type: I/O port or memory
*
* Adjust file name and size for sparse mappings.
*/
void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
{
struct pci_controller *hose = bus->sysdata;
if (!has_sparse(hose, mmap_type))
return;
if (mmap_type == pci_mmap_mem) {
bus->legacy_mem->attr.name = "legacy_mem_sparse";
bus->legacy_mem->size <<= 5;
} else {
bus->legacy_io->attr.name = "legacy_io_sparse";
bus->legacy_io->size <<= 5;
}
return;
}
/* Legacy I/O bus read/write functions */
int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
{
struct pci_controller *hose = bus->sysdata;
port += hose->io_space->start;
switch(size) {
case 1:
*((u8 *)val) = inb(port);
return 1;
case 2:
if (port & 1)
return -EINVAL;
*((u16 *)val) = inw(port);
return 2;
case 4:
if (port & 3)
return -EINVAL;
*((u32 *)val) = inl(port);
return 4;
}
return -EINVAL;
}
int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
{
struct pci_controller *hose = bus->sysdata;
port += hose->io_space->start;
switch(size) {
case 1:
outb(port, val);
return 1;
case 2:
if (port & 1)
return -EINVAL;
outw(port, val);
return 2;
case 4:
if (port & 3)
return -EINVAL;
outl(port, val);
return 4;
}
return -EINVAL;
}