512 lines
13 KiB
C
512 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Support routines for initializing a PCI subsystem
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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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* 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/kernel.h>
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#include <linux/export.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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static void pci_std_update_resource(struct pci_dev *dev, int resno)
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{
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struct pci_bus_region region;
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bool disable;
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u16 cmd;
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u32 new, check, mask;
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int reg;
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struct resource *res = dev->resource + resno;
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/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
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if (dev->is_virtfn)
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return;
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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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if (res->flags & IORESOURCE_UNSET)
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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 shouldn't move around.
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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->bus, ®ion, res);
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new = region.start;
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if (res->flags & IORESOURCE_IO) {
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mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
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new |= res->flags & ~PCI_BASE_ADDRESS_IO_MASK;
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} else if (resno == PCI_ROM_RESOURCE) {
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mask = PCI_ROM_ADDRESS_MASK;
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} else {
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mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
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new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK;
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}
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if (resno < PCI_ROM_RESOURCE) {
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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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/*
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* Apparently some Matrox devices have ROM BARs that read
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* as zero when disabled, so don't update ROM BARs unless
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* they're enabled. See
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* https://lore.kernel.org/r/43147B3D.1030309@vc.cvut.cz/
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* But we must update ROM BAR for buggy devices where even a
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* disabled ROM can conflict with other BARs.
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*/
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if (!(res->flags & IORESOURCE_ROM_ENABLE) &&
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!dev->rom_bar_overlap)
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return;
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reg = dev->rom_base_reg;
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if (res->flags & IORESOURCE_ROM_ENABLE)
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new |= PCI_ROM_ADDRESS_ENABLE;
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} else
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return;
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/*
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* We can't update a 64-bit BAR atomically, so when possible,
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* disable decoding so that a half-updated BAR won't conflict
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* with another device.
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*/
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disable = (res->flags & IORESOURCE_MEM_64) && !dev->mmio_always_on;
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if (disable) {
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pci_read_config_word(dev, PCI_COMMAND, &cmd);
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pci_write_config_word(dev, PCI_COMMAND,
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cmd & ~PCI_COMMAND_MEMORY);
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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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pci_err(dev, "BAR %d: error updating (%#08x != %#08x)\n",
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resno, new, check);
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}
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if (res->flags & IORESOURCE_MEM_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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pci_err(dev, "BAR %d: error updating (high %#08x != %#08x)\n",
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resno, new, check);
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}
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}
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if (disable)
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pci_write_config_word(dev, PCI_COMMAND, cmd);
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}
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void pci_update_resource(struct pci_dev *dev, int resno)
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{
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if (resno <= PCI_ROM_RESOURCE)
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pci_std_update_resource(dev, resno);
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#ifdef CONFIG_PCI_IOV
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else if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
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pci_iov_update_resource(dev, resno);
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#endif
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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, *conflict;
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if (res->flags & IORESOURCE_UNSET) {
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pci_info(dev, "can't claim BAR %d %pR: no address assigned\n",
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resource, res);
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return -EINVAL;
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}
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/*
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* If we have a shadow copy in RAM, the PCI device doesn't respond
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* to the shadow range, so we don't need to claim it, and upstream
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* bridges don't need to route the range to the device.
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*/
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if (res->flags & IORESOURCE_ROM_SHADOW)
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return 0;
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root = pci_find_parent_resource(dev, res);
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if (!root) {
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pci_info(dev, "can't claim BAR %d %pR: no compatible bridge window\n",
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resource, res);
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res->flags |= IORESOURCE_UNSET;
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return -EINVAL;
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}
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conflict = request_resource_conflict(root, res);
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if (conflict) {
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pci_info(dev, "can't claim BAR %d %pR: address conflict with %s %pR\n",
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resource, res, conflict->name, conflict);
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res->flags |= IORESOURCE_UNSET;
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return -EBUSY;
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}
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return 0;
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}
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EXPORT_SYMBOL(pci_claim_resource);
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void pci_disable_bridge_window(struct pci_dev *dev)
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{
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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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/*
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* Generic function that returns a value indicating that the device's
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* original BIOS BAR address was not saved and so is not available for
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* reinstatement.
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*
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* Can be over-ridden by architecture specific code that implements
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* reinstatement functionality rather than leaving it disabled when
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* normal allocation attempts fail.
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*/
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resource_size_t __weak pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
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{
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return 0;
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}
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static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
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int resno, resource_size_t size)
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{
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struct resource *root, *conflict;
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resource_size_t fw_addr, start, end;
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fw_addr = pcibios_retrieve_fw_addr(dev, resno);
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if (!fw_addr)
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return -ENOMEM;
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start = res->start;
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end = res->end;
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res->start = fw_addr;
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res->end = res->start + size - 1;
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res->flags &= ~IORESOURCE_UNSET;
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root = pci_find_parent_resource(dev, res);
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if (!root) {
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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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}
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pci_info(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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pci_info(dev, "BAR %d: %pR conflicts with %s %pR\n",
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resno, res, conflict->name, conflict);
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res->start = start;
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res->end = end;
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res->flags |= IORESOURCE_UNSET;
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return -EBUSY;
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}
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return 0;
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}
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/*
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* We don't have to worry about legacy ISA devices, so nothing to do here.
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* This is marked as __weak because multiple architectures define it; it should
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* eventually go away.
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*/
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resource_size_t __weak pcibios_align_resource(void *data,
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const struct resource *res,
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resource_size_t size,
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resource_size_t align)
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{
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return res->start;
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}
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static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
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int resno, resource_size_t size, resource_size_t align)
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{
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struct resource *res = dev->resource + resno;
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resource_size_t min;
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int ret;
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min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
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/*
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* First, try exact prefetching match. Even if a 64-bit
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* prefetchable bridge window is below 4GB, we can't put a 32-bit
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* prefetchable resource in it because pbus_size_mem() assumes a
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* 64-bit window will contain no 32-bit resources. If we assign
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* things differently than they were sized, not everything will fit.
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*/
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ret = pci_bus_alloc_resource(bus, res, size, align, min,
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IORESOURCE_PREFETCH | IORESOURCE_MEM_64,
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pcibios_align_resource, dev);
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if (ret == 0)
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return 0;
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/*
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* If the prefetchable window is only 32 bits wide, we can put
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* 64-bit prefetchable resources in it.
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*/
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if ((res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) ==
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(IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) {
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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)
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return 0;
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}
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/*
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* If we didn't find a better match, we can put any memory resource
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* in a non-prefetchable window. If this resource is 32 bits and
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* non-prefetchable, the first call already tried the only possibility
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* so we don't need to try again.
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*/
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if (res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64))
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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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return ret;
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}
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static int _pci_assign_resource(struct pci_dev *dev, int resno,
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resource_size_t size, resource_size_t min_align)
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{
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struct pci_bus *bus;
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int ret;
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bus = dev->bus;
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while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
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if (!bus->parent || !bus->self->transparent)
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break;
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bus = bus->parent;
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}
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return ret;
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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 resource *res = dev->resource + resno;
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resource_size_t align, size;
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int ret;
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if (res->flags & IORESOURCE_PCI_FIXED)
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return 0;
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res->flags |= IORESOURCE_UNSET;
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align = pci_resource_alignment(dev, res);
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if (!align) {
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pci_info(dev, "BAR %d: can't assign %pR (bogus alignment)\n",
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resno, res);
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return -EINVAL;
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}
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size = resource_size(res);
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ret = _pci_assign_resource(dev, resno, size, align);
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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 (ret < 0) {
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pci_info(dev, "BAR %d: no space for %pR\n", resno, res);
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ret = pci_revert_fw_address(res, dev, resno, size);
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}
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if (ret < 0) {
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pci_info(dev, "BAR %d: failed to assign %pR\n", resno, res);
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return ret;
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}
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res->flags &= ~IORESOURCE_UNSET;
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res->flags &= ~IORESOURCE_STARTALIGN;
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pci_info(dev, "BAR %d: assigned %pR\n", resno, res);
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if (resno < PCI_BRIDGE_RESOURCES)
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pci_update_resource(dev, resno);
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return 0;
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}
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EXPORT_SYMBOL(pci_assign_resource);
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int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsize,
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resource_size_t min_align)
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{
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struct resource *res = dev->resource + resno;
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unsigned long flags;
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resource_size_t new_size;
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int ret;
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if (res->flags & IORESOURCE_PCI_FIXED)
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return 0;
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flags = res->flags;
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res->flags |= IORESOURCE_UNSET;
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if (!res->parent) {
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pci_info(dev, "BAR %d: can't reassign an unassigned resource %pR\n",
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resno, res);
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return -EINVAL;
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}
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/* already aligned with min_align */
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new_size = resource_size(res) + addsize;
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ret = _pci_assign_resource(dev, resno, new_size, min_align);
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if (ret) {
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res->flags = flags;
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pci_info(dev, "BAR %d: %pR (failed to expand by %#llx)\n",
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resno, res, (unsigned long long) addsize);
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return ret;
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}
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res->flags &= ~IORESOURCE_UNSET;
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res->flags &= ~IORESOURCE_STARTALIGN;
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pci_info(dev, "BAR %d: reassigned %pR (expanded by %#llx)\n",
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resno, res, (unsigned long long) addsize);
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if (resno < PCI_BRIDGE_RESOURCES)
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pci_update_resource(dev, resno);
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return 0;
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}
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void pci_release_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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pci_info(dev, "BAR %d: releasing %pR\n", resno, res);
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if (!res->parent)
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return;
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release_resource(res);
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res->end = resource_size(res) - 1;
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res->start = 0;
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res->flags |= IORESOURCE_UNSET;
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}
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EXPORT_SYMBOL(pci_release_resource);
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int pci_resize_resource(struct pci_dev *dev, int resno, int size)
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{
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struct resource *res = dev->resource + resno;
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struct pci_host_bridge *host;
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int old, ret;
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u32 sizes;
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u16 cmd;
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/* Check if we must preserve the firmware's resource assignment */
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host = pci_find_host_bridge(dev->bus);
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if (host->preserve_config)
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return -ENOTSUPP;
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||
|
/* Make sure the resource isn't assigned before resizing it. */
|
||
|
if (!(res->flags & IORESOURCE_UNSET))
|
||
|
return -EBUSY;
|
||
|
|
||
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
||
|
if (cmd & PCI_COMMAND_MEMORY)
|
||
|
return -EBUSY;
|
||
|
|
||
|
sizes = pci_rebar_get_possible_sizes(dev, resno);
|
||
|
if (!sizes)
|
||
|
return -ENOTSUPP;
|
||
|
|
||
|
if (!(sizes & BIT(size)))
|
||
|
return -EINVAL;
|
||
|
|
||
|
old = pci_rebar_get_current_size(dev, resno);
|
||
|
if (old < 0)
|
||
|
return old;
|
||
|
|
||
|
ret = pci_rebar_set_size(dev, resno, size);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
res->end = res->start + pci_rebar_size_to_bytes(size) - 1;
|
||
|
|
||
|
/* Check if the new config works by trying to assign everything. */
|
||
|
if (dev->bus->self) {
|
||
|
ret = pci_reassign_bridge_resources(dev->bus->self, res->flags);
|
||
|
if (ret)
|
||
|
goto error_resize;
|
||
|
}
|
||
|
return 0;
|
||
|
|
||
|
error_resize:
|
||
|
pci_rebar_set_size(dev, resno, old);
|
||
|
res->end = res->start + pci_rebar_size_to_bytes(old) - 1;
|
||
|
return ret;
|
||
|
}
|
||
|
EXPORT_SYMBOL(pci_resize_resource);
|
||
|
|
||
|
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->flags & IORESOURCE_UNSET) {
|
||
|
pci_err(dev, "can't enable device: BAR %d %pR not assigned\n",
|
||
|
i, r);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
if (!r->parent) {
|
||
|
pci_err(dev, "can't enable device: BAR %d %pR not claimed\n",
|
||
|
i, r);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
if (r->flags & IORESOURCE_IO)
|
||
|
cmd |= PCI_COMMAND_IO;
|
||
|
if (r->flags & IORESOURCE_MEM)
|
||
|
cmd |= PCI_COMMAND_MEMORY;
|
||
|
}
|
||
|
|
||
|
if (cmd != old_cmd) {
|
||
|
pci_info(dev, "enabling device (%04x -> %04x)\n", old_cmd, cmd);
|
||
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|