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PCI: Extending pci=resource_alignment to specify device/vendor IDs

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Some uio-based PCI drivers, e.g., uio_cif do not work if the assigned PCI
memory resources are not page aligned.

By using the kernel option "pci=resource_alignment" it is possible to force
single PCI boards to use page alignment for their memory resources.
However, this is fairly cumbersome if several of these boards are in use
as the specification of the cards has to be done via PCI bus/slot/function
number which might change, e.g., by adding another board.

Extend the kernel option "pci=resource_alignment" to allow specification of
relevant devices via PCI device/vendor (and subdevice/subvendor) IDs.  The
specification of the devices via device/vendor is indicated by a leading
string "pci:" as argument to "pci=resource_alignment".  The format of the
specification is pci:<vendor>:<device>[:<subvendor>:<subdevice>]

Signed-off-by: Mathias Koehrer <mathias.koehrer@etas.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Koehrer Mathias (ETAS/ESW5) 2016-06-07 14:24:17 +00:00 committed by Bjorn Helgaas
parent 3b146b24a4
commit 644a544fd9
2 changed files with 49 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/kernel-parameters.txt
View File

@ -2998,6 +2998,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
resource_alignment=
Format:
[<order of align>@][<domain>:]<bus>:<slot>.<func>[; ...]
[<order of align>@]pci:<vendor>:<device>\
[:<subvendor>:<subdevice>][; ...]
Specifies alignment and device to reassign
aligned memory resources.
If <order of align> is not specified,

66
drivers/pci/pci.c
View File

@ -4755,6 +4755,7 @@ static DEFINE_SPINLOCK(resource_alignment_lock);
static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
{
int seg, bus, slot, func, align_order, count;
unsigned short vendor, device, subsystem_vendor, subsystem_device;
resource_size_t align = 0;
char *p;
@ -4768,28 +4769,55 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
} else {
align_order = -1;
}
if (sscanf(p, "%x:%x:%x.%x%n",
&seg, &bus, &slot, &func, &count) != 4) {
seg = 0;
if (sscanf(p, "%x:%x.%x%n",
&bus, &slot, &func, &count) != 3) {
/* Invalid format */
printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n",
p);
if (strncmp(p, "pci:", 4) == 0) {
/* PCI vendor/device (subvendor/subdevice) ids are specified */
p += 4;
if (sscanf(p, "%hx:%hx:%hx:%hx%n",
&vendor, &device, &subsystem_vendor, &subsystem_device, &count) != 4) {
if (sscanf(p, "%hx:%hx%n", &vendor, &device, &count) != 2) {
printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: pci:%s\n",
p);
break;
}
subsystem_vendor = subsystem_device = 0;
}
p += count;
if ((!vendor || (vendor == dev->vendor)) &&
(!device || (device == dev->device)) &&
(!subsystem_vendor || (subsystem_vendor == dev->subsystem_vendor)) &&
(!subsystem_device || (subsystem_device == dev->subsystem_device))) {
if (align_order == -1)
align = PAGE_SIZE;
else
align = 1 << align_order;
/* Found */
break;
}
}
p += count;
if (seg == pci_domain_nr(dev->bus) &&
bus == dev->bus->number &&
slot == PCI_SLOT(dev->devfn) &&
func == PCI_FUNC(dev->devfn)) {
if (align_order == -1)
align = PAGE_SIZE;
else
align = 1 << align_order;
/* Found */
break;
else {
if (sscanf(p, "%x:%x:%x.%x%n",
&seg, &bus, &slot, &func, &count) != 4) {
seg = 0;
if (sscanf(p, "%x:%x.%x%n",
&bus, &slot, &func, &count) != 3) {
/* Invalid format */
printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n",
p);
break;
}
}
p += count;
if (seg == pci_domain_nr(dev->bus) &&
bus == dev->bus->number &&
slot == PCI_SLOT(dev->devfn) &&
func == PCI_FUNC(dev->devfn)) {
if (align_order == -1)
align = PAGE_SIZE;
else
align = 1 << align_order;
/* Found */
break;
}
}
if (*p != ';' && *p != ',') {
/* End of param or invalid format */