[PATCH] powerpc: Split out PCI address cache to its own file

25-pci-address-cache.patch

The core EEH file is rather large. This patch splits out a self-contained
chunk of it into its own file.  This is the chunk that performes the
caching and lookup of pci devices based on the i/o addresses of thier
resoures.  This code is almos architecture-independent and could be
used by any system that wanted to find a pci device based only on
the i/o address used by the device.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
(cherry picked from b0b291d59906d4a9a89ed9e34d9fd684c7188924 commit)

1 files changed, 2 insertions, 293 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index d6560c45637b..57bef2c2f325 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/arch/powerpc/platforms/pseries/eeh.c
@@ -76,9 +76,6 @@
  */
 #define EEH_MAX_FAILS   100000
 
-/* Misc forward declaraions */
-static void eeh_save_bars(struct pci_dev * pdev, struct pci_dn *pdn);
-
 /* RTAS tokens */
 static int ibm_set_eeh_option;
 static int ibm_set_slot_reset;
@@ -107,296 +104,8 @@ static DEFINE_PER_CPU(unsigned long, false_positives);
 static DEFINE_PER_CPU(unsigned long, ignored_failures);
 static DEFINE_PER_CPU(unsigned long, slot_resets);
 
-/**
- * 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
- * address, the corresponding PCI device can be **quickly**
- * found. It is safe to perform an address lookup in an interrupt
- * context; this ability is an important feature.
- *
- * Currently, the only customer of this code is the EEH subsystem;
- * thus, this code has been somewhat tailored to suit EEH better.
- * In particular, the cache does *not* hold the addresses of devices
- * for which EEH is not enabled.
- *
- * (Implementation Note: The RB tree seems to be better/faster
- * 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;
-        unsigned long addr_lo;
-        unsigned long addr_hi;
-        struct pci_dev *pcidev;
-        unsigned int flags;
-};
-
-static struct pci_io_addr_cache
-{
-        struct rb_root rb_root;
-        spinlock_t piar_lock;
-} pci_io_addr_cache_root;
-
-static inline struct pci_dev *__pci_get_device_by_addr(unsigned long addr)
-{
-        struct rb_node *n = pci_io_addr_cache_root.rb_root.rb_node;
-
-        while (n) {
-                struct pci_io_addr_range *piar;
-                piar = rb_entry(n, struct pci_io_addr_range, rb_node);
-
-                if (addr < piar->addr_lo) {
-                        n = n->rb_left;
-                } else {
-                        if (addr > piar->addr_hi) {
-                                n = n->rb_right;
-                        } else {
-                                pci_dev_get(piar->pcidev);
-                                return piar->pcidev;
-                        }
-                }
-        }
-
-        return NULL;
-}
-
-/**
- * pci_get_device_by_addr - Get device, given only address
- * @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
- * from zero (that is, they do *not* have pci_io_addr added in).
- * It is safe to call this function within an interrupt.
- */
-static struct pci_dev *pci_get_device_by_addr(unsigned long addr)
-{
-        struct pci_dev *dev;
-        unsigned long flags;
-
-        spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
-        dev = __pci_get_device_by_addr(addr);
-        spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
-        return dev;
-}
-
-#ifdef DEBUG
-/*
- * Handy-dandy debug print routine, does nothing more
- * than print out the contents of our addr cache.
- */
-static void pci_addr_cache_print(struct pci_io_addr_cache *cache)
-{
-        struct rb_node *n;
-        int cnt = 0;
-
-        n = rb_first(&cache->rb_root);
-        while (n) {
-                struct pci_io_addr_range *piar;
-                piar = rb_entry(n, struct pci_io_addr_range, rb_node);
-                printk(KERN_DEBUG "PCI: %s addr range %d [%lx-%lx]: %s\n",
-                       (piar->flags & IORESOURCE_IO) ? "i/o" : "mem", cnt,
-                       piar->addr_lo, piar->addr_hi, pci_name(piar->pcidev));
-                cnt++;
-                n = rb_next(n);
-        }
-}
-#endif
-
-/* Insert address range into the rb tree. */
-static struct pci_io_addr_range *
-pci_addr_cache_insert(struct pci_dev *dev, unsigned long alo,
-                      unsigned long ahi, unsigned int flags)
-{
-        struct rb_node **p = &pci_io_addr_cache_root.rb_root.rb_node;
-        struct rb_node *parent = NULL;
-        struct pci_io_addr_range *piar;
-
-        /* Walk tree, find a place to insert into tree */
-        while (*p) {
-                parent = *p;
-                piar = rb_entry(parent, struct pci_io_addr_range, rb_node);
-                if (ahi < piar->addr_lo) {
-                        p = &parent->rb_left;
-                } else if (alo > piar->addr_hi) {
-                        p = &parent->rb_right;
-                } else {
-                        if (dev != piar->pcidev ||
-                            alo != piar->addr_lo || ahi != piar->addr_hi) {
-                                printk(KERN_WARNING "PIAR: overlapping address range\n");
-                        }
-                        return piar;
-                }
-        }
-        piar = (struct pci_io_addr_range *)kmalloc(sizeof(struct pci_io_addr_range), GFP_ATOMIC);
-        if (!piar)
-                return NULL;
-
-        piar->addr_lo = alo;
-        piar->addr_hi = ahi;
-        piar->pcidev = dev;
-        piar->flags = flags;
-
-#ifdef DEBUG
-        printk(KERN_DEBUG "PIAR: insert range=[%lx:%lx] dev=%s\n",
-                          alo, ahi, pci_name (dev));
-#endif
-
-        rb_link_node(&piar->rb_node, parent, p);
-        rb_insert_color(&piar->rb_node, &pci_io_addr_cache_root.rb_root);
-
-        return piar;
-}
-
-static void __pci_addr_cache_insert_device(struct pci_dev *dev)
-{
-        struct device_node *dn;
-        struct pci_dn *pdn;
-        int i;
-        int inserted = 0;
-
-        dn = pci_device_to_OF_node(dev);
-        if (!dn) {
-                printk(KERN_WARNING "PCI: no pci dn found for dev=%s\n", pci_name(dev));
-                return;
-        }
-
-        /* Skip any devices for which EEH is not enabled. */
-        pdn = PCI_DN(dn);
-        if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) ||
-            pdn->eeh_mode & EEH_MODE_NOCHECK) {
-#ifdef DEBUG
-                printk(KERN_INFO "PCI: skip building address cache for=%s - %s\n",
-                       pci_name(dev), pdn->node->full_name);
-#endif
-                return;
-        }
-
-        /* The cache holds a reference to the device... */
-        pci_dev_get(dev);
-
-        /* Walk resources on this device, poke them into the tree */
-        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-                unsigned long start = pci_resource_start(dev,i);
-                unsigned long end = pci_resource_end(dev,i);
-                unsigned int flags = pci_resource_flags(dev,i);
-
-                /* We are interested only bus addresses, not dma or other stuff */
-                if (0 == (flags & (IORESOURCE_IO | IORESOURCE_MEM)))
-                        continue;
-                if (start == 0 || ~start == 0 || end == 0 || ~end == 0)
-                         continue;
-                pci_addr_cache_insert(dev, start, end, flags);
-                inserted = 1;
-        }
-
-        /* If there was nothing to add, the cache has no reference... */
-        if (!inserted)
-                pci_dev_put(dev);
-}
-
-/**
- * pci_addr_cache_insert_device - Add a device to the address cache
- * @dev: PCI device whose I/O addresses we are interested in.
- *
- * In order to support the fast lookup of devices based on addresses,
- * we maintain a cache of devices that can be quickly searched.
- * This routine adds a device to that cache.
- */
-static void pci_addr_cache_insert_device(struct pci_dev *dev)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
-        __pci_addr_cache_insert_device(dev);
-        spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
-}
-
-static inline void __pci_addr_cache_remove_device(struct pci_dev *dev)
-{
-        struct rb_node *n;
-        int removed = 0;
-
-restart:
-        n = rb_first(&pci_io_addr_cache_root.rb_root);
-        while (n) {
-                struct pci_io_addr_range *piar;
-                piar = rb_entry(n, struct pci_io_addr_range, rb_node);
-
-                if (piar->pcidev == dev) {
-                        rb_erase(n, &pci_io_addr_cache_root.rb_root);
-                        removed = 1;
-                        kfree(piar);
-                        goto restart;
-                }
-                n = rb_next(n);
-        }
-
-        /* The cache no longer holds its reference to this device... */
-        if (removed)
-                pci_dev_put(dev);
-}
-
-/**
- * pci_addr_cache_remove_device - remove pci device from addr cache
- * @dev: device to remove
- *
- * Remove a device from the addr-cache tree.
- * This is potentially expensive, since it will walk
- * the tree multiple times (once per resource).
- * But so what; device removal doesn't need to be that fast.
- */
-static void pci_addr_cache_remove_device(struct pci_dev *dev)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&pci_io_addr_cache_root.piar_lock, flags);
-        __pci_addr_cache_remove_device(dev);
-        spin_unlock_irqrestore(&pci_io_addr_cache_root.piar_lock, flags);
-}
-
-/**
- * pci_addr_cache_build - Build a cache of I/O addresses
- *
- * Build 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 scaned for devices (after all device resources are known).
- */
-void __init pci_addr_cache_build(void)
-{
-        struct device_node *dn;
-        struct pci_dev *dev = NULL;
-
-        if (!eeh_subsystem_enabled)
-                return;
-
-        spin_lock_init(&pci_io_addr_cache_root.piar_lock);
-
-        while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
-                /* Ignore PCI bridges ( XXX why ??) */
-                if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) {
-                        continue;
-                }
-                pci_addr_cache_insert_device(dev);
-
-                /* Save the BAR's; firmware doesn't restore these after EEH reset */
-                dn = pci_device_to_OF_node(dev);
-                eeh_save_bars(dev, PCI_DN(dn));
-        }
-
-#ifdef DEBUG
-        /* Verify tree built up above, echo back the list of addrs. */
-        pci_addr_cache_print(&pci_io_addr_cache_root);
-#endif
-}
-
 /* --------------------------------------------------------------- */
-/* Above lies the PCI Address Cache. Below lies the EEH event infrastructure */
+/* Below lies the EEH event infrastructure */
 
 void eeh_slot_error_detail (struct pci_dn *pdn, int severity)
 {
@@ -880,7 +589,7 @@ void eeh_restore_bars(struct pci_dn *pdn)
  * PCI devices are added individuallly; but, for the restore,
  * an entire slot is reset at a time.
  */
-static void eeh_save_bars(struct pci_dev * pdev, struct pci_dn *pdn)
+void eeh_save_bars(struct pci_dev * pdev, struct pci_dn *pdn)
 {
         int i;