diff options
Diffstat (limited to 'arch/powerpc/kernel/eeh_cache.c')
| -rw-r--r-- | arch/powerpc/kernel/eeh_cache.c | 93 |
1 files changed, 37 insertions, 56 deletions
diff --git a/arch/powerpc/kernel/eeh_cache.c b/arch/powerpc/kernel/eeh_cache.c index d4cc26618809..2f9dbf8ad2ee 100644 --- a/arch/powerpc/kernel/eeh_cache.c +++ b/arch/powerpc/kernel/eeh_cache.c @@ -1,22 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * PCI address cache; allows the lookup of PCI devices based on I/O address * * Copyright IBM Corporation 2004 * Copyright Linas Vepstas <linas@austin.ibm.com> 2004 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/list.h> @@ -25,11 +12,14 @@ #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/atomic.h> +#include <linux/debugfs.h> #include <asm/pci-bridge.h> #include <asm/ppc-pci.h> /** + * DOC: Overview + * * The pci address cache subsystem. This subsystem places * PCI device address resources into a red-black tree, sorted * according to the address range, so that given only an i/o @@ -46,6 +36,7 @@ * than any hash algo I could think of for this problem, even * with the penalty of slow pointer chases for d-cache misses). */ + struct pci_io_addr_range { struct rb_node rb_node; resource_size_t addr_lo; @@ -84,8 +75,7 @@ static inline struct eeh_dev *__eeh_addr_cache_get_device(unsigned long addr) * @addr: mmio (PIO) phys address or i/o port number * * Given an mmio phys address, or a port number, find a pci device - * that implements this address. Be sure to pci_dev_put the device - * when finished. I/O port numbers are assumed to be offset + * that implements this address. I/O port numbers are assumed to be offset * from zero (that is, they do *not* have pci_io_addr added in). * It is safe to call this function within an interrupt. */ @@ -114,7 +104,7 @@ static void eeh_addr_cache_print(struct pci_io_addr_cache *cache) while (n) { struct pci_io_addr_range *piar; piar = rb_entry(n, struct pci_io_addr_range, rb_node); - pr_debug("PCI: %s addr range %d [%pap-%pap]: %s\n", + pr_info("PCI: %s addr range %d [%pap-%pap]: %s\n", (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", cnt, &piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev)); cnt++; @@ -158,10 +148,8 @@ eeh_addr_cache_insert(struct pci_dev *dev, resource_size_t alo, piar->pcidev = dev; piar->flags = flags; -#ifdef DEBUG - pr_debug("PIAR: insert range=[%pap:%pap] dev=%s\n", - &alo, &ahi, pci_name(dev)); -#endif + eeh_edev_dbg(piar->edev, "PIAR: insert range=[%pap:%pap]\n", + &alo, &ahi); rb_link_node(&piar->rb_node, parent, p); rb_insert_color(&piar->rb_node, &pci_io_addr_cache_root.rb_root); @@ -171,18 +159,10 @@ eeh_addr_cache_insert(struct pci_dev *dev, resource_size_t alo, static void __eeh_addr_cache_insert_dev(struct pci_dev *dev) { - struct pci_dn *pdn; struct eeh_dev *edev; int i; - pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn); - if (!pdn) { - pr_warn("PCI: no pci dn found for dev=%s\n", - pci_name(dev)); - return; - } - - edev = pdn_to_eeh_dev(pdn); + edev = pci_dev_to_eeh_dev(dev); if (!edev) { pr_warn("PCI: no EEH dev found for %s\n", pci_name(dev)); @@ -241,6 +221,8 @@ restart: piar = rb_entry(n, struct pci_io_addr_range, rb_node); if (piar->pcidev == dev) { + eeh_edev_dbg(piar->edev, "PIAR: remove range=[%pap:%pap]\n", + &piar->addr_lo, &piar->addr_hi); rb_erase(n, &pci_io_addr_cache_root.rb_root); kfree(piar); goto restart; @@ -268,40 +250,39 @@ void eeh_addr_cache_rmv_dev(struct pci_dev *dev) } /** - * eeh_addr_cache_build - Build a cache of I/O addresses + * eeh_addr_cache_init - Initialize a cache of I/O addresses * - * Build a cache of pci i/o addresses. This cache will be used to + * Initialize a cache of pci i/o addresses. This cache will be used to * find the pci device that corresponds to a given address. - * This routine scans all pci busses to build the cache. - * Must be run late in boot process, after the pci controllers - * have been scanned for devices (after all device resources are known). */ -void eeh_addr_cache_build(void) +void eeh_addr_cache_init(void) { - struct pci_dn *pdn; - struct eeh_dev *edev; - struct pci_dev *dev = NULL; - spin_lock_init(&pci_io_addr_cache_root.piar_lock); +} - for_each_pci_dev(dev) { - pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn); - if (!pdn) - continue; - - edev = pdn_to_eeh_dev(pdn); - if (!edev) - continue; +static int eeh_addr_cache_show(struct seq_file *s, void *v) +{ + struct pci_io_addr_range *piar; + struct rb_node *n; + unsigned long flags; - dev->dev.archdata.edev = edev; - edev->pdev = dev; + spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags); + for (n = rb_first(&pci_io_addr_cache_root.rb_root); n; n = rb_next(n)) { + piar = rb_entry(n, struct pci_io_addr_range, rb_node); - eeh_addr_cache_insert_dev(dev); - eeh_sysfs_add_device(dev); + seq_printf(s, "%s addr range [%pap-%pap]: %s\n", + (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", + &piar->addr_lo, &piar->addr_hi, pci_name(piar->pcidev)); } + spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags); -#ifdef DEBUG - /* Verify tree built up above, echo back the list of addrs. */ - eeh_addr_cache_print(&pci_io_addr_cache_root); -#endif + return 0; +} +DEFINE_SHOW_ATTRIBUTE(eeh_addr_cache); + +void __init eeh_cache_debugfs_init(void) +{ + debugfs_create_file_unsafe("eeh_address_cache", 0400, + arch_debugfs_dir, NULL, + &eeh_addr_cache_fops); } |