884525655d
Done per Linus' request and suggestions. Linus has explained that better than I'll be able to explain: On Thu, Mar 27, 2008 at 10:12:10AM -0700, Linus Torvalds wrote: > Actually, before we go any further, there might be a less intrusive > alternative: add just a couple of flags to the resource flags field (we > still have something like 8 unused bits on 32-bit), and use those to > implement a generic "resource_alignment()" routine. > > Two flags would do it: > > - IORESOURCE_SIZEALIGN: size indicates alignment (regular PCI device > resources) > > - IORESOURCE_STARTALIGN: start field is alignment (PCI bus resources > during probing) > > and then the case of both flags zero (or both bits set) would actually be > "invalid", and we would also clear the IORESOURCE_STARTALIGN flag when we > actually allocate the resource (so that we don't use the "start" field as > alignment incorrectly when it no longer indicates alignment). > > That wouldn't be totally generic, but it would have the nice property of > automatically at least add sanity checking for that whole "res->start has > the odd meaning of 'alignment' during probing" and remove the need for a > new field, and it would allow us to have a generic "resource_alignment()" > routine that just gets a resource pointer. Besides, I removed IORESOURCE_BUS_HAS_VGA flag which was unused for ages. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Gary Hade <garyhade@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
312 lines
7.6 KiB
C
312 lines
7.6 KiB
C
/*
|
|
* drivers/pci/setup-res.c
|
|
*
|
|
* Extruded from code written by
|
|
* Dave Rusling (david.rusling@reo.mts.dec.com)
|
|
* David Mosberger (davidm@cs.arizona.edu)
|
|
* David Miller (davem@redhat.com)
|
|
*
|
|
* Support routines for initializing a PCI subsystem.
|
|
*/
|
|
|
|
/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
|
|
|
|
/*
|
|
* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
|
|
* Resource sorting
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/slab.h>
|
|
#include "pci.h"
|
|
|
|
|
|
void
|
|
pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
|
|
{
|
|
struct pci_bus_region region;
|
|
u32 new, check, mask;
|
|
int reg;
|
|
|
|
/*
|
|
* Ignore resources for unimplemented BARs and unused resource slots
|
|
* for 64 bit BARs.
|
|
*/
|
|
if (!res->flags)
|
|
return;
|
|
|
|
/*
|
|
* Ignore non-moveable resources. This might be legacy resources for
|
|
* which no functional BAR register exists or another important
|
|
* system resource we should better not move around in system address
|
|
* space.
|
|
*/
|
|
if (res->flags & IORESOURCE_PCI_FIXED)
|
|
return;
|
|
|
|
pcibios_resource_to_bus(dev, ®ion, res);
|
|
|
|
pr_debug(" got res [%llx:%llx] bus [%llx:%llx] flags %lx for "
|
|
"BAR %d of %s\n", (unsigned long long)res->start,
|
|
(unsigned long long)res->end,
|
|
(unsigned long long)region.start,
|
|
(unsigned long long)region.end,
|
|
(unsigned long)res->flags, resno, pci_name(dev));
|
|
|
|
new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
|
|
if (res->flags & IORESOURCE_IO)
|
|
mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
|
|
else
|
|
mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
|
|
|
|
if (resno < 6) {
|
|
reg = PCI_BASE_ADDRESS_0 + 4 * resno;
|
|
} else if (resno == PCI_ROM_RESOURCE) {
|
|
if (!(res->flags & IORESOURCE_ROM_ENABLE))
|
|
return;
|
|
new |= PCI_ROM_ADDRESS_ENABLE;
|
|
reg = dev->rom_base_reg;
|
|
} else {
|
|
/* Hmm, non-standard resource. */
|
|
|
|
return; /* kill uninitialised var warning */
|
|
}
|
|
|
|
pci_write_config_dword(dev, reg, new);
|
|
pci_read_config_dword(dev, reg, &check);
|
|
|
|
if ((new ^ check) & mask) {
|
|
printk(KERN_ERR "PCI: Error while updating region "
|
|
"%s/%d (%08x != %08x)\n", pci_name(dev), resno,
|
|
new, check);
|
|
}
|
|
|
|
if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
|
|
(PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
|
|
new = region.start >> 16 >> 16;
|
|
pci_write_config_dword(dev, reg + 4, new);
|
|
pci_read_config_dword(dev, reg + 4, &check);
|
|
if (check != new) {
|
|
printk(KERN_ERR "PCI: Error updating region "
|
|
"%s/%d (high %08x != %08x)\n",
|
|
pci_name(dev), resno, new, check);
|
|
}
|
|
}
|
|
res->flags &= ~IORESOURCE_UNSET;
|
|
pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
|
|
pci_name(dev), resno, res->flags,
|
|
new & ~PCI_REGION_FLAG_MASK);
|
|
}
|
|
|
|
int pci_claim_resource(struct pci_dev *dev, int resource)
|
|
{
|
|
struct resource *res = &dev->resource[resource];
|
|
struct resource *root = NULL;
|
|
char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
|
|
int err;
|
|
|
|
root = pcibios_select_root(dev, res);
|
|
|
|
err = -EINVAL;
|
|
if (root != NULL)
|
|
err = insert_resource(root, res);
|
|
|
|
if (err) {
|
|
printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",
|
|
root ? "Address space collision on" :
|
|
"No parent found for",
|
|
resource, dtype, pci_name(dev),
|
|
(unsigned long long)res->start,
|
|
(unsigned long long)res->end);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int pci_assign_resource(struct pci_dev *dev, int resno)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
struct resource *res = dev->resource + resno;
|
|
resource_size_t size, min, align;
|
|
int ret;
|
|
|
|
size = res->end - res->start + 1;
|
|
min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
|
|
|
|
align = resource_alignment(res);
|
|
if (!align) {
|
|
printk(KERN_ERR "PCI: Cannot allocate resource (bogus "
|
|
"alignment) %d [%llx:%llx] (flags %lx) of %s\n",
|
|
resno, (unsigned long long)res->start,
|
|
(unsigned long long)res->end, res->flags,
|
|
pci_name(dev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* First, try exact prefetching match.. */
|
|
ret = pci_bus_alloc_resource(bus, res, size, align, min,
|
|
IORESOURCE_PREFETCH,
|
|
pcibios_align_resource, dev);
|
|
|
|
if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
|
|
/*
|
|
* That failed.
|
|
*
|
|
* But a prefetching area can handle a non-prefetching
|
|
* window (it will just not perform as well).
|
|
*/
|
|
ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
|
|
pcibios_align_resource, dev);
|
|
}
|
|
|
|
if (ret) {
|
|
printk(KERN_ERR "PCI: Failed to allocate %s resource "
|
|
"#%d:%llx@%llx for %s\n",
|
|
res->flags & IORESOURCE_IO ? "I/O" : "mem",
|
|
resno, (unsigned long long)size,
|
|
(unsigned long long)res->start, pci_name(dev));
|
|
} else {
|
|
res->flags &= ~IORESOURCE_STARTALIGN;
|
|
if (resno < PCI_BRIDGE_RESOURCES)
|
|
pci_update_resource(dev, res, resno);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if 0
|
|
int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
struct resource *res = dev->resource + resno;
|
|
unsigned int type_mask;
|
|
int i, ret = -EBUSY;
|
|
|
|
type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
|
|
|
|
for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
|
|
struct resource *r = bus->resource[i];
|
|
if (!r)
|
|
continue;
|
|
|
|
/* type_mask must match */
|
|
if ((res->flags ^ r->flags) & type_mask)
|
|
continue;
|
|
|
|
ret = request_resource(r, res);
|
|
|
|
if (ret == 0)
|
|
break;
|
|
}
|
|
|
|
if (ret) {
|
|
printk(KERN_ERR "PCI: Failed to allocate %s resource "
|
|
"#%d:%llx@%llx for %s\n",
|
|
res->flags & IORESOURCE_IO ? "I/O" : "mem",
|
|
resno, (unsigned long long)(res->end - res->start + 1),
|
|
(unsigned long long)res->start, pci_name(dev));
|
|
} else if (resno < PCI_BRIDGE_RESOURCES) {
|
|
pci_update_resource(dev, res, resno);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
|
|
#endif
|
|
|
|
/* Sort resources by alignment */
|
|
void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
|
|
struct resource *r;
|
|
struct resource_list *list, *tmp;
|
|
resource_size_t r_align;
|
|
|
|
r = &dev->resource[i];
|
|
|
|
if (r->flags & IORESOURCE_PCI_FIXED)
|
|
continue;
|
|
|
|
if (!(r->flags) || r->parent)
|
|
continue;
|
|
|
|
r_align = resource_alignment(r);
|
|
if (!r_align) {
|
|
printk(KERN_WARNING "PCI: bogus alignment of resource "
|
|
"%d [%llx:%llx] (flags %lx) of %s\n",
|
|
i, (unsigned long long)r->start,
|
|
(unsigned long long)r->end, r->flags,
|
|
pci_name(dev));
|
|
continue;
|
|
}
|
|
for (list = head; ; list = list->next) {
|
|
resource_size_t align = 0;
|
|
struct resource_list *ln = list->next;
|
|
|
|
if (ln)
|
|
align = resource_alignment(ln->res);
|
|
|
|
if (r_align > align) {
|
|
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
|
|
if (!tmp)
|
|
panic("pdev_sort_resources(): "
|
|
"kmalloc() failed!\n");
|
|
tmp->next = ln;
|
|
tmp->res = r;
|
|
tmp->dev = dev;
|
|
list->next = tmp;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int pci_enable_resources(struct pci_dev *dev, int mask)
|
|
{
|
|
u16 cmd, old_cmd;
|
|
int i;
|
|
struct resource *r;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
old_cmd = cmd;
|
|
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
|
|
if (!(mask & (1 << i)))
|
|
continue;
|
|
|
|
r = &dev->resource[i];
|
|
|
|
if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
|
|
continue;
|
|
if ((i == PCI_ROM_RESOURCE) &&
|
|
(!(r->flags & IORESOURCE_ROM_ENABLE)))
|
|
continue;
|
|
|
|
if (!r->parent) {
|
|
dev_err(&dev->dev, "device not available because of "
|
|
"BAR %d [%llx:%llx] collisions\n", i,
|
|
(unsigned long long) r->start,
|
|
(unsigned long long) r->end);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (r->flags & IORESOURCE_IO)
|
|
cmd |= PCI_COMMAND_IO;
|
|
if (r->flags & IORESOURCE_MEM)
|
|
cmd |= PCI_COMMAND_MEMORY;
|
|
}
|
|
|
|
if (cmd != old_cmd) {
|
|
dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
|
|
old_cmd, cmd);
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
return 0;
|
|
}
|