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>
313 lines
7.6 KiB
C
313 lines
7.6 KiB
C
/*
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* drivers/pci/setup-res.c
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*
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* Extruded from code written by
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* Dave Rusling (david.rusling@reo.mts.dec.com)
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* David Mosberger (davidm@cs.arizona.edu)
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* David Miller (davem@redhat.com)
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*
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* Support routines for initializing a PCI subsystem.
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*/
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/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
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/*
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* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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* Resource sorting
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/cache.h>
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#include <linux/slab.h>
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#include "pci.h"
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void
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pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
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{
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struct pci_bus_region region;
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u32 new, check, mask;
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int reg;
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/*
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* Ignore resources for unimplemented BARs and unused resource slots
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* for 64 bit BARs.
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*/
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if (!res->flags)
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return;
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/*
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* Ignore non-moveable resources. This might be legacy resources for
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* which no functional BAR register exists or another important
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* system resource we should better not move around in system address
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* space.
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*/
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if (res->flags & IORESOURCE_PCI_FIXED)
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return;
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pcibios_resource_to_bus(dev, ®ion, res);
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pr_debug(" got res [%llx:%llx] bus [%llx:%llx] flags %lx for "
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"BAR %d of %s\n", (unsigned long long)res->start,
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(unsigned long long)res->end,
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(unsigned long long)region.start,
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(unsigned long long)region.end,
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(unsigned long)res->flags, resno, pci_name(dev));
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new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
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if (res->flags & IORESOURCE_IO)
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mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
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else
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mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
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if (resno < 6) {
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reg = PCI_BASE_ADDRESS_0 + 4 * resno;
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} else if (resno == PCI_ROM_RESOURCE) {
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if (!(res->flags & IORESOURCE_ROM_ENABLE))
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return;
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new |= PCI_ROM_ADDRESS_ENABLE;
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reg = dev->rom_base_reg;
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} else {
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/* Hmm, non-standard resource. */
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return; /* kill uninitialised var warning */
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}
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pci_write_config_dword(dev, reg, new);
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pci_read_config_dword(dev, reg, &check);
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if ((new ^ check) & mask) {
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printk(KERN_ERR "PCI: Error while updating region "
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"%s/%d (%08x != %08x)\n", pci_name(dev), resno,
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new, check);
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}
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if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
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(PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
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new = region.start >> 16 >> 16;
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pci_write_config_dword(dev, reg + 4, new);
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pci_read_config_dword(dev, reg + 4, &check);
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if (check != new) {
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printk(KERN_ERR "PCI: Error updating region "
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"%s/%d (high %08x != %08x)\n",
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pci_name(dev), resno, new, check);
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}
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}
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res->flags &= ~IORESOURCE_UNSET;
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pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
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pci_name(dev), resno, res->flags,
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new & ~PCI_REGION_FLAG_MASK);
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}
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int pci_claim_resource(struct pci_dev *dev, int resource)
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{
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struct resource *res = &dev->resource[resource];
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struct resource *root = NULL;
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char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
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int err;
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root = pcibios_select_root(dev, res);
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err = -EINVAL;
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if (root != NULL)
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err = insert_resource(root, res);
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if (err) {
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printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",
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root ? "Address space collision on" :
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"No parent found for",
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resource, dtype, pci_name(dev),
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(unsigned long long)res->start,
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(unsigned long long)res->end);
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}
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return err;
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}
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int pci_assign_resource(struct pci_dev *dev, int resno)
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{
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struct pci_bus *bus = dev->bus;
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struct resource *res = dev->resource + resno;
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resource_size_t size, min, align;
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int ret;
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size = res->end - res->start + 1;
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min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
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align = resource_alignment(res);
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if (!align) {
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printk(KERN_ERR "PCI: Cannot allocate resource (bogus "
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"alignment) %d [%llx:%llx] (flags %lx) of %s\n",
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resno, (unsigned long long)res->start,
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(unsigned long long)res->end, res->flags,
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pci_name(dev));
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return -EINVAL;
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}
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/* First, try exact prefetching match.. */
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ret = pci_bus_alloc_resource(bus, res, size, align, min,
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IORESOURCE_PREFETCH,
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pcibios_align_resource, dev);
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if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
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/*
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* That failed.
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*
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* But a prefetching area can handle a non-prefetching
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* window (it will just not perform as well).
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*/
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ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
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pcibios_align_resource, dev);
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}
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if (ret) {
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printk(KERN_ERR "PCI: Failed to allocate %s resource "
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"#%d:%llx@%llx for %s\n",
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res->flags & IORESOURCE_IO ? "I/O" : "mem",
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resno, (unsigned long long)size,
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(unsigned long long)res->start, pci_name(dev));
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} else {
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res->flags &= ~IORESOURCE_STARTALIGN;
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if (resno < PCI_BRIDGE_RESOURCES)
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pci_update_resource(dev, res, resno);
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}
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return ret;
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}
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#if 0
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int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
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{
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struct pci_bus *bus = dev->bus;
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struct resource *res = dev->resource + resno;
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unsigned int type_mask;
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int i, ret = -EBUSY;
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type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
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for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
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struct resource *r = bus->resource[i];
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if (!r)
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continue;
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/* type_mask must match */
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if ((res->flags ^ r->flags) & type_mask)
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continue;
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ret = request_resource(r, res);
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if (ret == 0)
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break;
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}
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if (ret) {
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printk(KERN_ERR "PCI: Failed to allocate %s resource "
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"#%d:%llx@%llx for %s\n",
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res->flags & IORESOURCE_IO ? "I/O" : "mem",
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resno, (unsigned long long)(res->end - res->start + 1),
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(unsigned long long)res->start, pci_name(dev));
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} else if (resno < PCI_BRIDGE_RESOURCES) {
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pci_update_resource(dev, res, resno);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
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#endif
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/* Sort resources by alignment */
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void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
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{
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int i;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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struct resource *r;
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struct resource_list *list, *tmp;
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resource_size_t r_align;
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r = &dev->resource[i];
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if (r->flags & IORESOURCE_PCI_FIXED)
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continue;
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if (!(r->flags) || r->parent)
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continue;
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r_align = resource_alignment(r);
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if (!r_align) {
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printk(KERN_WARNING "PCI: bogus alignment of resource "
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"%d [%llx:%llx] (flags %lx) of %s\n",
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i, (unsigned long long)r->start,
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(unsigned long long)r->end, r->flags,
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pci_name(dev));
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continue;
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}
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for (list = head; ; list = list->next) {
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resource_size_t align = 0;
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struct resource_list *ln = list->next;
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if (ln)
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align = resource_alignment(ln->res);
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if (r_align > align) {
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tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
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if (!tmp)
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panic("pdev_sort_resources(): "
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"kmalloc() failed!\n");
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tmp->next = ln;
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tmp->res = r;
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tmp->dev = dev;
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list->next = tmp;
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break;
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}
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}
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}
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}
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int pci_enable_resources(struct pci_dev *dev, int mask)
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{
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u16 cmd, old_cmd;
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int i;
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struct resource *r;
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pci_read_config_word(dev, PCI_COMMAND, &cmd);
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old_cmd = cmd;
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for (i = 0; i < PCI_NUM_RESOURCES; i++) {
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if (!(mask & (1 << i)))
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continue;
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r = &dev->resource[i];
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if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
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continue;
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if ((i == PCI_ROM_RESOURCE) &&
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(!(r->flags & IORESOURCE_ROM_ENABLE)))
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continue;
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if (!r->parent) {
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dev_err(&dev->dev, "device not available because of "
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"BAR %d [%llx:%llx] collisions\n", i,
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(unsigned long long) r->start,
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(unsigned long long) r->end);
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return -EINVAL;
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}
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if (r->flags & IORESOURCE_IO)
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cmd |= PCI_COMMAND_IO;
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if (r->flags & IORESOURCE_MEM)
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cmd |= PCI_COMMAND_MEMORY;
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}
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if (cmd != old_cmd) {
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dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
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old_cmd, cmd);
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pci_write_config_word(dev, PCI_COMMAND, cmd);
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}
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return 0;
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}
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