2005-04-17 00:20:36 +02:00
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/*
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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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2008-11-21 19:38:52 +01:00
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void pci_update_resource(struct pci_dev *dev, int resno)
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2005-04-17 00:20:36 +02:00
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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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2008-11-21 19:41:27 +01:00
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enum pci_bar_type type;
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2008-11-21 19:38:52 +01:00
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struct resource *res = dev->resource + resno;
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2005-04-17 00:20:36 +02:00
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2006-12-19 22:12:08 +01:00
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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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2005-08-07 11:49:59 +02:00
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if (!res->flags)
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return;
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2006-12-19 22:12:08 +01:00
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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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2008-06-13 18:52:11 +02:00
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* system resource we shouldn't move around.
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2006-12-19 22:12:08 +01:00
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*/
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if (res->flags & IORESOURCE_PCI_FIXED)
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return;
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2005-04-17 00:20:36 +02:00
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pcibios_resource_to_bus(dev, ®ion, res);
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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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2008-11-21 19:41:27 +01:00
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reg = pci_resource_bar(dev, resno, &type);
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if (!reg)
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return;
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if (type != pci_bar_unknown) {
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2005-08-26 19:49:22 +02:00
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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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2005-04-17 00:20:36 +02:00
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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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2008-06-13 18:52:11 +02:00
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dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
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resno, new, check);
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2005-04-17 00:20:36 +02:00
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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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2005-08-07 11:49:59 +02:00
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new = region.start >> 16 >> 16;
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2005-04-17 00:20:36 +02:00
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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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2008-06-13 18:52:11 +02:00
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dev_err(&dev->dev, "BAR %d: error updating "
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"(high %#08x != %#08x)\n", resno, new, check);
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2005-04-17 00:20:36 +02:00
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}
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}
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res->flags &= ~IORESOURCE_UNSET;
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2009-11-04 18:32:57 +01:00
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dev_info(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx]\n",
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resno, res, (unsigned long long)region.start,
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(unsigned long long)region.end);
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2005-04-17 00:20:36 +02:00
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}
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2007-03-27 07:53:30 +02:00
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int pci_claim_resource(struct pci_dev *dev, int resource)
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2005-04-17 00:20:36 +02:00
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{
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struct resource *res = &dev->resource[resource];
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2010-03-12 01:01:19 +01:00
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struct resource *root, *conflict;
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2005-04-17 00:20:36 +02:00
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2009-06-17 22:33:33 +02:00
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root = pci_find_parent_resource(dev, res);
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2009-11-04 18:32:57 +01:00
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if (!root) {
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2010-06-03 21:47:18 +02:00
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dev_info(&dev->dev, "no compatible bridge window for %pR\n",
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res);
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2009-11-04 18:32:57 +01:00
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return -EINVAL;
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2005-04-17 00:20:36 +02:00
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}
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2010-03-12 01:01:19 +01:00
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conflict = request_resource_conflict(root, res);
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if (conflict) {
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2010-06-03 21:47:18 +02:00
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dev_info(&dev->dev,
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"address space collision: %pR conflicts with %s %pR\n",
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res, conflict->name, conflict);
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2010-03-12 01:01:19 +01:00
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return -EBUSY;
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}
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2009-11-04 18:32:57 +01:00
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2010-03-12 01:01:19 +01:00
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return 0;
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2005-04-17 00:20:36 +02:00
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}
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2009-07-01 06:45:44 +02:00
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EXPORT_SYMBOL(pci_claim_resource);
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2005-04-17 00:20:36 +02:00
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2009-03-16 09:13:39 +01:00
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#ifdef CONFIG_PCI_QUIRKS
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void pci_disable_bridge_window(struct pci_dev *dev)
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{
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2009-11-04 18:32:57 +01:00
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dev_info(&dev->dev, "disabling bridge mem windows\n");
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2009-03-16 09:13:39 +01:00
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/* MMIO Base/Limit */
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pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
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/* Prefetchable MMIO Base/Limit */
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pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
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pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
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pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
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}
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#endif /* CONFIG_PCI_QUIRKS */
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2009-04-24 05:49:25 +02:00
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static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
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int resno)
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2005-04-17 00:20:36 +02:00
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{
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struct resource *res = dev->resource + resno;
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2006-06-13 02:06:02 +02:00
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resource_size_t size, min, align;
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2005-04-17 00:20:36 +02:00
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int ret;
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2008-10-13 13:24:28 +02:00
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size = resource_size(res);
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2005-04-17 00:20:36 +02:00
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min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
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2009-08-28 22:00:06 +02:00
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align = pci_resource_alignment(dev, res);
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2005-04-17 00:20:36 +02:00
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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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PCI: fall back to original BIOS BAR addresses
If we fail to assign resources to a PCI BAR, this patch makes us try the
original address from BIOS rather than leaving it disabled.
Linux tries to make sure all PCI device BARs are inside the upstream
PCI host bridge or P2P bridge apertures, reassigning BARs if necessary.
Windows does similar reassignment.
Before this patch, if we could not move a BAR into an aperture, we left
the resource unassigned, i.e., at address zero. Windows leaves such BARs
at the original BIOS addresses, and this patch makes Linux do the same.
This is a bit ugly because we disable the resource long before we try to
reassign it, so we have to keep track of the BIOS BAR address somewhere.
For lack of a better place, I put it in the struct pci_dev.
I think it would be cleaner to attempt the assignment immediately when the
claim fails, so we could easily remember the original address. But we
currently claim motherboard resources in the middle, after attempting to
claim PCI resources and before assigning new PCI resources, and changing
that is a fairly big job.
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16263
Reported-by: Andrew <nitr0@seti.kr.ua>
Tested-by: Andrew <nitr0@seti.kr.ua>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2010-07-15 17:41:42 +02:00
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if (ret < 0 && dev->fw_addr[resno]) {
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struct resource *root, *conflict;
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resource_size_t start, end;
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/*
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* If we failed to assign anything, let's try the address
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* where firmware left it. That at least has a chance of
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* working, which is better than just leaving it disabled.
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*/
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if (res->flags & IORESOURCE_IO)
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root = &ioport_resource;
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else
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root = &iomem_resource;
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start = res->start;
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end = res->end;
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res->start = dev->fw_addr[resno];
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res->end = res->start + size - 1;
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dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
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resno, res);
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conflict = request_resource_conflict(root, res);
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if (conflict) {
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dev_info(&dev->dev,
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"BAR %d: %pR conflicts with %s %pR\n", resno,
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res, conflict->name, conflict);
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res->start = start;
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res->end = end;
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} else
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ret = 0;
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}
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2009-04-24 05:49:25 +02:00
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if (!ret) {
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PCI: clean up resource alignment management
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>
2008-03-30 17:50:14 +02:00
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res->flags &= ~IORESOURCE_STARTALIGN;
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2009-11-04 18:32:57 +01:00
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dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
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PCI: clean up resource alignment management
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>
2008-03-30 17:50:14 +02:00
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if (resno < PCI_BRIDGE_RESOURCES)
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2008-11-21 19:38:52 +01:00
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pci_update_resource(dev, resno);
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2005-04-17 00:20:36 +02:00
|
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}
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return ret;
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}
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|
2009-04-24 05:49:25 +02:00
|
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int pci_assign_resource(struct pci_dev *dev, int resno)
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{
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struct resource *res = dev->resource + resno;
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resource_size_t align;
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struct pci_bus *bus;
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int ret;
|
2009-11-04 18:32:57 +01:00
|
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char *type;
|
2009-04-24 05:49:25 +02:00
|
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|
2009-08-28 22:00:06 +02:00
|
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align = pci_resource_alignment(dev, res);
|
2009-04-24 05:49:25 +02:00
|
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if (!align) {
|
2009-11-04 18:32:57 +01:00
|
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dev_info(&dev->dev, "BAR %d: can't assign %pR "
|
2009-10-06 23:33:44 +02:00
|
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"(bogus alignment)\n", resno, res);
|
2009-04-24 05:49:25 +02:00
|
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return -EINVAL;
|
|
|
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}
|
|
|
|
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bus = dev->bus;
|
|
|
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while ((ret = __pci_assign_resource(bus, dev, resno))) {
|
|
|
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if (bus->parent && bus->self->transparent)
|
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|
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bus = bus->parent;
|
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else
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|
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bus = NULL;
|
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|
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if (bus)
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|
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continue;
|
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|
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break;
|
|
|
|
}
|
|
|
|
|
2009-11-04 18:32:57 +01:00
|
|
|
if (ret) {
|
|
|
|
if (res->flags & IORESOURCE_MEM)
|
|
|
|
if (res->flags & IORESOURCE_PREFETCH)
|
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|
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type = "mem pref";
|
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|
|
else
|
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|
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type = "mem";
|
|
|
|
else if (res->flags & IORESOURCE_IO)
|
|
|
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type = "io";
|
|
|
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else
|
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|
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type = "unknown";
|
|
|
|
dev_info(&dev->dev,
|
|
|
|
"BAR %d: can't assign %s (size %#llx)\n",
|
|
|
|
resno, type, (unsigned long long) resource_size(res));
|
|
|
|
}
|
2009-04-24 05:49:25 +02:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* Sort resources by alignment */
|
2007-03-27 07:53:30 +02:00
|
|
|
void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
|
|
|
|
struct resource *r;
|
|
|
|
struct resource_list *list, *tmp;
|
2006-06-13 02:06:02 +02:00
|
|
|
resource_size_t r_align;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
r = &dev->resource[i];
|
2006-12-19 22:12:08 +01:00
|
|
|
|
|
|
|
if (r->flags & IORESOURCE_PCI_FIXED)
|
|
|
|
continue;
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!(r->flags) || r->parent)
|
|
|
|
continue;
|
PCI: clean up resource alignment management
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>
2008-03-30 17:50:14 +02:00
|
|
|
|
2009-08-28 22:00:06 +02:00
|
|
|
r_align = pci_resource_alignment(dev, r);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!r_align) {
|
2009-10-27 20:26:47 +01:00
|
|
|
dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
|
2009-10-06 23:33:44 +02:00
|
|
|
i, r);
|
2005-04-17 00:20:36 +02:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
for (list = head; ; list = list->next) {
|
2006-06-13 02:06:02 +02:00
|
|
|
resource_size_t align = 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
struct resource_list *ln = list->next;
|
PCI: clean up resource alignment management
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>
2008-03-30 17:50:14 +02:00
|
|
|
|
|
|
|
if (ln)
|
2009-08-28 22:00:06 +02:00
|
|
|
align = pci_resource_alignment(ln->dev, ln->res);
|
PCI: clean up resource alignment management
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>
2008-03-30 17:50:14 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2008-03-04 19:56:47 +01:00
|
|
|
|
|
|
|
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) {
|
2009-11-04 18:32:57 +01:00
|
|
|
dev_err(&dev->dev, "device not available "
|
|
|
|
"(can't reserve %pR)\n", r);
|
2008-03-04 19:56:47 +01:00
|
|
|
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;
|
|
|
|
}
|