1 files changed, 252 insertions, 293 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 07369f32e8bb..1febe90831b4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -431,6 +431,32 @@ pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
 }
 
 /**
+ * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos
+ * @dev: the PCI device to operate on
+ * @pos: config space offset of status word
+ * @mask: mask of bit(s) to care about in status word
+ *
+ * Return 1 when mask bit(s) in status word clear, 0 otherwise.
+ */
+int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask)
+{
+        int i;
+
+        /* Wait for Transaction Pending bit clean */
+        for (i = 0; i < 4; i++) {
+                u16 status;
+                if (i)
+                        msleep((1 << (i - 1)) * 100);
+
+                pci_read_config_word(dev, pos, &status);
+                if (!(status & mask))
+                        return 1;
+        }
+
+        return 0;
+}
+
+/**
  * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
  * @dev: PCI device to have its BARs restored
  *
@@ -657,6 +683,28 @@ static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state)
 }
 
 /**
+ * pci_wakeup - Wake up a PCI device
+ * @pci_dev: Device to handle.
+ * @ign: ignored parameter
+ */
+static int pci_wakeup(struct pci_dev *pci_dev, void *ign)
+{
+        pci_wakeup_event(pci_dev);
+        pm_request_resume(&pci_dev->dev);
+        return 0;
+}
+
+/**
+ * pci_wakeup_bus - Walk given bus and wake up devices on it
+ * @bus: Top bus of the subtree to walk.
+ */
+static void pci_wakeup_bus(struct pci_bus *bus)
+{
+        if (bus)
+                pci_walk_bus(bus, pci_wakeup, NULL);
+}
+
+/**
  * __pci_start_power_transition - Start power transition of a PCI device
  * @dev: PCI device to handle.
  * @state: State to put the device into.
@@ -835,18 +883,28 @@ EXPORT_SYMBOL(pci_choose_state);
 #define PCI_EXP_SAVE_REGS       7
 
 
-static struct pci_cap_saved_state *pci_find_saved_cap(
-        struct pci_dev *pci_dev, char cap)
+static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev,
+                                                       u16 cap, bool extended)
 {
         struct pci_cap_saved_state *tmp;
 
         hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) {
-                if (tmp->cap.cap_nr == cap)
+                if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap)
                         return tmp;
         }
         return NULL;
 }
 
+struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap)
+{
+        return _pci_find_saved_cap(dev, cap, false);
+}
+
+struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap)
+{
+        return _pci_find_saved_cap(dev, cap, true);
+}
+
 static int pci_save_pcie_state(struct pci_dev *dev)
 {
         int i = 0;
@@ -948,6 +1006,8 @@ pci_save_state(struct pci_dev *dev)
                 return i;
         if ((i = pci_save_pcix_state(dev)) != 0)
                 return i;
+        if ((i = pci_save_vc_state(dev)) != 0)
+                return i;
         return 0;
 }
 
@@ -1010,6 +1070,7 @@ void pci_restore_state(struct pci_dev *dev)
         /* PCI Express register must be restored first */
         pci_restore_pcie_state(dev);
         pci_restore_ats_state(dev);
+        pci_restore_vc_state(dev);
 
         pci_restore_config_space(dev);
 
@@ -1071,7 +1132,8 @@ EXPORT_SYMBOL_GPL(pci_store_saved_state);
  * @dev: PCI device that we're dealing with
  * @state: Saved state returned from pci_store_saved_state()
  */
-int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state)
+static int pci_load_saved_state(struct pci_dev *dev,
+                                struct pci_saved_state *state)
 {
         struct pci_cap_saved_data *cap;
 
@@ -1087,7 +1149,7 @@ int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state)
         while (cap->size) {
                 struct pci_cap_saved_state *tmp;
 
-                tmp = pci_find_saved_cap(dev, cap->cap_nr);
+                tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended);
                 if (!tmp || tmp->cap.size != cap->size)
                         return -EINVAL;
 
@@ -1099,7 +1161,6 @@ int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state)
         dev->state_saved = true;
         return 0;
 }
-EXPORT_SYMBOL_GPL(pci_load_saved_state);
 
 /**
  * pci_load_and_free_saved_state - Reload the save state pointed to by state,
@@ -1531,27 +1592,6 @@ void pci_pme_wakeup_bus(struct pci_bus *bus)
                 pci_walk_bus(bus, pci_pme_wakeup, (void *)true);
 }
 
-/**
- * pci_wakeup - Wake up a PCI device
- * @pci_dev: Device to handle.
- * @ign: ignored parameter
- */
-static int pci_wakeup(struct pci_dev *pci_dev, void *ign)
-{
-        pci_wakeup_event(pci_dev);
-        pm_request_resume(&pci_dev->dev);
-        return 0;
-}
-
-/**
- * pci_wakeup_bus - Walk given bus and wake up devices on it
- * @bus: Top bus of the subtree to walk.
- */
-void pci_wakeup_bus(struct pci_bus *bus)
-{
-        if (bus)
-                pci_walk_bus(bus, pci_wakeup, NULL);
-}
 
 /**
  * pci_pme_capable - check the capability of PCI device to generate PME#
@@ -1765,7 +1805,7 @@ int pci_wake_from_d3(struct pci_dev *dev, bool enable)
  * If the platform can't manage @dev, return the deepest state from which it
  * can generate wake events, based on any available PME info.
  */
-pci_power_t pci_target_state(struct pci_dev *dev)
+static pci_power_t pci_target_state(struct pci_dev *dev)
 {
         pci_power_t target_state = PCI_D3hot;
 
@@ -2021,18 +2061,24 @@ static void pci_add_saved_cap(struct pci_dev *pci_dev,
 }
 
 /**
- * pci_add_cap_save_buffer - allocate buffer for saving given capability registers
+ * _pci_add_cap_save_buffer - allocate buffer for saving given
+ *                            capability registers
  * @dev: the PCI device
  * @cap: the capability to allocate the buffer for
+ * @extended: Standard or Extended capability ID
  * @size: requested size of the buffer
  */
-static int pci_add_cap_save_buffer(
-        struct pci_dev *dev, char cap, unsigned int size)
+static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap,
+                                    bool extended, unsigned int size)
 {
         int pos;
         struct pci_cap_saved_state *save_state;
 
-        pos = pci_find_capability(dev, cap);
+        if (extended)
+                pos = pci_find_ext_capability(dev, cap);
+        else
+                pos = pci_find_capability(dev, cap);
+
         if (pos <= 0)
                 return 0;
 
@@ -2041,12 +2087,23 @@ static int pci_add_cap_save_buffer(
                 return -ENOMEM;
 
         save_state->cap.cap_nr = cap;
+        save_state->cap.cap_extended = extended;
         save_state->cap.size = size;
         pci_add_saved_cap(dev, save_state);
 
         return 0;
 }
 
+int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size)
+{
+        return _pci_add_cap_save_buffer(dev, cap, false, size);
+}
+
+int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size)
+{
+        return _pci_add_cap_save_buffer(dev, cap, true, size);
+}
+
 /**
  * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
  * @dev: the PCI device
@@ -2065,6 +2122,8 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev)
         if (error)
                 dev_err(&dev->dev,
                         "unable to preallocate PCI-X save buffer\n");
+
+        pci_allocate_vc_save_buffers(dev);
 }
 
 void pci_free_cap_save_buffers(struct pci_dev *dev)
@@ -2110,242 +2169,6 @@ void pci_configure_ari(struct pci_dev *dev)
         }
 }
 
-/**
- * pci_enable_ido - enable ID-based Ordering on a device
- * @dev: the PCI device
- * @type: which types of IDO to enable
- *
- * Enable ID-based ordering on @dev.  @type can contain the bits
- * %PCI_EXP_IDO_REQUEST and/or %PCI_EXP_IDO_COMPLETION to indicate
- * which types of transactions are allowed to be re-ordered.
- */
-void pci_enable_ido(struct pci_dev *dev, unsigned long type)
-{
-        u16 ctrl = 0;
-
-        if (type & PCI_EXP_IDO_REQUEST)
-                ctrl |= PCI_EXP_DEVCTL2_IDO_REQ_EN;
-        if (type & PCI_EXP_IDO_COMPLETION)
-                ctrl |= PCI_EXP_DEVCTL2_IDO_CMP_EN;
-        if (ctrl)
-                pcie_capability_set_word(dev, PCI_EXP_DEVCTL2, ctrl);
-}
-EXPORT_SYMBOL(pci_enable_ido);
-
-/**
- * pci_disable_ido - disable ID-based ordering on a device
- * @dev: the PCI device
- * @type: which types of IDO to disable
- */
-void pci_disable_ido(struct pci_dev *dev, unsigned long type)
-{
-        u16 ctrl = 0;
-
-        if (type & PCI_EXP_IDO_REQUEST)
-                ctrl |= PCI_EXP_DEVCTL2_IDO_REQ_EN;
-        if (type & PCI_EXP_IDO_COMPLETION)
-                ctrl |= PCI_EXP_DEVCTL2_IDO_CMP_EN;
-        if (ctrl)
-                pcie_capability_clear_word(dev, PCI_EXP_DEVCTL2, ctrl);
-}
-EXPORT_SYMBOL(pci_disable_ido);
-
-/**
- * pci_enable_obff - enable optimized buffer flush/fill
- * @dev: PCI device
- * @type: type of signaling to use
- *
- * Try to enable @type OBFF signaling on @dev.  It will try using WAKE#
- * signaling if possible, falling back to message signaling only if
- * WAKE# isn't supported.  @type should indicate whether the PCIe link
- * be brought out of L0s or L1 to send the message.  It should be either
- * %PCI_EXP_OBFF_SIGNAL_ALWAYS or %PCI_OBFF_SIGNAL_L0.
- *
- * If your device can benefit from receiving all messages, even at the
- * power cost of bringing the link back up from a low power state, use
- * %PCI_EXP_OBFF_SIGNAL_ALWAYS.  Otherwise, use %PCI_OBFF_SIGNAL_L0 (the
- * preferred type).
- *
- * RETURNS:
- * Zero on success, appropriate error number on failure.
- */
-int pci_enable_obff(struct pci_dev *dev, enum pci_obff_signal_type type)
-{
-        u32 cap;
-        u16 ctrl;
-        int ret;
-
-        pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap);
-        if (!(cap & PCI_EXP_DEVCAP2_OBFF_MASK))
-                return -ENOTSUPP; /* no OBFF support at all */
-
-        /* Make sure the topology supports OBFF as well */
-        if (dev->bus->self) {
-                ret = pci_enable_obff(dev->bus->self, type);
-                if (ret)
-                        return ret;
-        }
-
-        pcie_capability_read_word(dev, PCI_EXP_DEVCTL2, &ctrl);
-        if (cap & PCI_EXP_DEVCAP2_OBFF_WAKE)
-                ctrl |= PCI_EXP_DEVCTL2_OBFF_WAKE_EN;
-        else {
-                switch (type) {
-                case PCI_EXP_OBFF_SIGNAL_L0:
-                        if (!(ctrl & PCI_EXP_DEVCTL2_OBFF_WAKE_EN))
-                                ctrl |= PCI_EXP_DEVCTL2_OBFF_MSGA_EN;
-                        break;
-                case PCI_EXP_OBFF_SIGNAL_ALWAYS:
-                        ctrl &= ~PCI_EXP_DEVCTL2_OBFF_WAKE_EN;
-                        ctrl |= PCI_EXP_DEVCTL2_OBFF_MSGB_EN;
-                        break;
-                default:
-                        WARN(1, "bad OBFF signal type\n");
-                        return -ENOTSUPP;
-                }
-        }
-        pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, ctrl);
-
-        return 0;
-}
-EXPORT_SYMBOL(pci_enable_obff);
-
-/**
- * pci_disable_obff - disable optimized buffer flush/fill
- * @dev: PCI device
- *
- * Disable OBFF on @dev.
- */
-void pci_disable_obff(struct pci_dev *dev)
-{
-        pcie_capability_clear_word(dev, PCI_EXP_DEVCTL2,
-                                   PCI_EXP_DEVCTL2_OBFF_WAKE_EN);
-}
-EXPORT_SYMBOL(pci_disable_obff);
-
-/**
- * pci_ltr_supported - check whether a device supports LTR
- * @dev: PCI device
- *
- * RETURNS:
- * True if @dev supports latency tolerance reporting, false otherwise.
- */
-static bool pci_ltr_supported(struct pci_dev *dev)
-{
-        u32 cap;
-
-        pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap);
-
-        return cap & PCI_EXP_DEVCAP2_LTR;
-}
-
-/**
- * pci_enable_ltr - enable latency tolerance reporting
- * @dev: PCI device
- *
- * Enable LTR on @dev if possible, which means enabling it first on
- * upstream ports.
- *
- * RETURNS:
- * Zero on success, errno on failure.
- */
-int pci_enable_ltr(struct pci_dev *dev)
-{
-        int ret;
-
-        /* Only primary function can enable/disable LTR */
-        if (PCI_FUNC(dev->devfn) != 0)
-                return -EINVAL;
-
-        if (!pci_ltr_supported(dev))
-                return -ENOTSUPP;
-
-        /* Enable upstream ports first */
-        if (dev->bus->self) {
-                ret = pci_enable_ltr(dev->bus->self);
-                if (ret)
-                        return ret;
-        }
-
-        return pcie_capability_set_word(dev, PCI_EXP_DEVCTL2,
-                                        PCI_EXP_DEVCTL2_LTR_EN);
-}
-EXPORT_SYMBOL(pci_enable_ltr);
-
-/**
- * pci_disable_ltr - disable latency tolerance reporting
- * @dev: PCI device
- */
-void pci_disable_ltr(struct pci_dev *dev)
-{
-        /* Only primary function can enable/disable LTR */
-        if (PCI_FUNC(dev->devfn) != 0)
-                return;
-
-        if (!pci_ltr_supported(dev))
-                return;
-
-        pcie_capability_clear_word(dev, PCI_EXP_DEVCTL2,
-                                   PCI_EXP_DEVCTL2_LTR_EN);
-}
-EXPORT_SYMBOL(pci_disable_ltr);
-
-static int __pci_ltr_scale(int *val)
-{
-        int scale = 0;
-
-        while (*val > 1023) {
-                *val = (*val + 31) / 32;
-                scale++;
-        }
-        return scale;
-}
-
-/**
- * pci_set_ltr - set LTR latency values
- * @dev: PCI device
- * @snoop_lat_ns: snoop latency in nanoseconds
- * @nosnoop_lat_ns: nosnoop latency in nanoseconds
- *
- * Figure out the scale and set the LTR values accordingly.
- */
-int pci_set_ltr(struct pci_dev *dev, int snoop_lat_ns, int nosnoop_lat_ns)
-{
-        int pos, ret, snoop_scale, nosnoop_scale;
-        u16 val;
-
-        if (!pci_ltr_supported(dev))
-                return -ENOTSUPP;
-
-        snoop_scale = __pci_ltr_scale(&snoop_lat_ns);
-        nosnoop_scale = __pci_ltr_scale(&nosnoop_lat_ns);
-
-        if (snoop_lat_ns > PCI_LTR_VALUE_MASK ||
-            nosnoop_lat_ns > PCI_LTR_VALUE_MASK)
-                return -EINVAL;
-
-        if ((snoop_scale > (PCI_LTR_SCALE_MASK >> PCI_LTR_SCALE_SHIFT)) ||
-            (nosnoop_scale > (PCI_LTR_SCALE_MASK >> PCI_LTR_SCALE_SHIFT)))
-                return -EINVAL;
-
-        pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR);
-        if (!pos)
-                return -ENOTSUPP;
-
-        val = (snoop_scale << PCI_LTR_SCALE_SHIFT) | snoop_lat_ns;
-        ret = pci_write_config_word(dev, pos + PCI_LTR_MAX_SNOOP_LAT, val);
-        if (ret != 4)
-                return -EIO;
-
-        val = (nosnoop_scale << PCI_LTR_SCALE_SHIFT) | nosnoop_lat_ns;
-        ret = pci_write_config_word(dev, pos + PCI_LTR_MAX_NOSNOOP_LAT, val);
-        if (ret != 4)
-                return -EIO;
-
-        return 0;
-}
-EXPORT_SYMBOL(pci_set_ltr);
-
 static int pci_acs_enable;
 
 /**
@@ -3138,7 +2961,7 @@ bool pci_check_and_mask_intx(struct pci_dev *dev)
 EXPORT_SYMBOL_GPL(pci_check_and_mask_intx);
 
 /**
- * pci_check_and_mask_intx - unmask INTx of no interrupt is pending
+ * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
  * @dev: the PCI device to operate on
  *
  * Check if the device dev has its INTx line asserted, unmask it if not
@@ -3204,20 +3027,10 @@ EXPORT_SYMBOL(pci_set_dma_seg_boundary);
  */
 int pci_wait_for_pending_transaction(struct pci_dev *dev)
 {
-        int i;
-        u16 status;
-
-        /* Wait for Transaction Pending bit clean */
-        for (i = 0; i < 4; i++) {
-                if (i)
-                        msleep((1 << (i - 1)) * 100);
-
-                pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &status);
-                if (!(status & PCI_EXP_DEVSTA_TRPND))
-                        return 1;
-        }
+        if (!pci_is_pcie(dev))
+                return 1;
 
-        return 0;
+        return pci_wait_for_pending(dev, PCI_EXP_DEVSTA, PCI_EXP_DEVSTA_TRPND);
 }
 EXPORT_SYMBOL(pci_wait_for_pending_transaction);
 
@@ -3244,10 +3057,8 @@ static int pcie_flr(struct pci_dev *dev, int probe)
 
 static int pci_af_flr(struct pci_dev *dev, int probe)
 {
-        int i;
         int pos;
         u8 cap;
-        u8 status;
 
         pos = pci_find_capability(dev, PCI_CAP_ID_AF);
         if (!pos)
@@ -3261,14 +3072,8 @@ static int pci_af_flr(struct pci_dev *dev, int probe)
                 return 0;
 
         /* Wait for Transaction Pending bit clean */
-        for (i = 0; i < 4; i++) {
-                if (i)
-                        msleep((1 << (i - 1)) * 100);
-
-                pci_read_config_byte(dev, pos + PCI_AF_STATUS, &status);
-                if (!(status & PCI_AF_STATUS_TP))
-                        goto clear;
-        }
+        if (pci_wait_for_pending(dev, PCI_AF_STATUS, PCI_AF_STATUS_TP))
+                goto clear;
 
         dev_err(&dev->dev, "transaction is not cleared; "
                         "proceeding with reset anyway\n");
@@ -3445,6 +3250,18 @@ static void pci_dev_lock(struct pci_dev *dev)
         device_lock(&dev->dev);
 }
 
+/* Return 1 on successful lock, 0 on contention */
+static int pci_dev_trylock(struct pci_dev *dev)
+{
+        if (pci_cfg_access_trylock(dev)) {
+                if (device_trylock(&dev->dev))
+                        return 1;
+                pci_cfg_access_unlock(dev);
+        }
+
+        return 0;
+}
+
 static void pci_dev_unlock(struct pci_dev *dev)
 {
         device_unlock(&dev->dev);
@@ -3588,6 +3405,34 @@ int pci_reset_function(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pci_reset_function);
 
+/**
+ * pci_try_reset_function - quiesce and reset a PCI device function
+ * @dev: PCI device to reset
+ *
+ * Same as above, except return -EAGAIN if unable to lock device.
+ */
+int pci_try_reset_function(struct pci_dev *dev)
+{
+        int rc;
+
+        rc = pci_dev_reset(dev, 1);
+        if (rc)
+                return rc;
+
+        pci_dev_save_and_disable(dev);
+
+        if (pci_dev_trylock(dev)) {
+                rc = __pci_dev_reset(dev, 0);
+                pci_dev_unlock(dev);
+        } else
+                rc = -EAGAIN;
+
+        pci_dev_restore(dev);
+
+        return rc;
+}
+EXPORT_SYMBOL_GPL(pci_try_reset_function);
+
 /* Lock devices from the top of the tree down */
 static void pci_bus_lock(struct pci_bus *bus)
 {
@@ -3612,6 +3457,32 @@ static void pci_bus_unlock(struct pci_bus *bus)
         }
 }
 
+/* Return 1 on successful lock, 0 on contention */
+static int pci_bus_trylock(struct pci_bus *bus)
+{
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &bus->devices, bus_list) {
+                if (!pci_dev_trylock(dev))
+                        goto unlock;
+                if (dev->subordinate) {
+                        if (!pci_bus_trylock(dev->subordinate)) {
+                                pci_dev_unlock(dev);
+                                goto unlock;
+                        }
+                }
+        }
+        return 1;
+
+unlock:
+        list_for_each_entry_continue_reverse(dev, &bus->devices, bus_list) {
+                if (dev->subordinate)
+                        pci_bus_unlock(dev->subordinate);
+                pci_dev_unlock(dev);
+        }
+        return 0;
+}
+
 /* Lock devices from the top of the tree down */
 static void pci_slot_lock(struct pci_slot *slot)
 {
@@ -3640,6 +3511,37 @@ static void pci_slot_unlock(struct pci_slot *slot)
         }
 }
 
+/* Return 1 on successful lock, 0 on contention */
+static int pci_slot_trylock(struct pci_slot *slot)
+{
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &slot->bus->devices, bus_list) {
+                if (!dev->slot || dev->slot != slot)
+                        continue;
+                if (!pci_dev_trylock(dev))
+                        goto unlock;
+                if (dev->subordinate) {
+                        if (!pci_bus_trylock(dev->subordinate)) {
+                                pci_dev_unlock(dev);
+                                goto unlock;
+                        }
+                }
+        }
+        return 1;
+
+unlock:
+        list_for_each_entry_continue_reverse(dev,
+                                             &slot->bus->devices, bus_list) {
+                if (!dev->slot || dev->slot != slot)
+                        continue;
+                if (dev->subordinate)
+                        pci_bus_unlock(dev->subordinate);
+                pci_dev_unlock(dev);
+        }
+        return 0;
+}
+
 /* Save and disable devices from the top of the tree down */
 static void pci_bus_save_and_disable(struct pci_bus *bus)
 {
@@ -3763,6 +3665,35 @@ int pci_reset_slot(struct pci_slot *slot)
 }
 EXPORT_SYMBOL_GPL(pci_reset_slot);
 
+/**
+ * pci_try_reset_slot - Try to reset a PCI slot
+ * @slot: PCI slot to reset
+ *
+ * Same as above except return -EAGAIN if the slot cannot be locked
+ */
+int pci_try_reset_slot(struct pci_slot *slot)
+{
+        int rc;
+
+        rc = pci_slot_reset(slot, 1);
+        if (rc)
+                return rc;
+
+        pci_slot_save_and_disable(slot);
+
+        if (pci_slot_trylock(slot)) {
+                might_sleep();
+                rc = pci_reset_hotplug_slot(slot->hotplug, 0);
+                pci_slot_unlock(slot);
+        } else
+                rc = -EAGAIN;
+
+        pci_slot_restore(slot);
+
+        return rc;
+}
+EXPORT_SYMBOL_GPL(pci_try_reset_slot);
+
 static int pci_bus_reset(struct pci_bus *bus, int probe)
 {
         if (!bus->self)
@@ -3822,6 +3753,35 @@ int pci_reset_bus(struct pci_bus *bus)
 EXPORT_SYMBOL_GPL(pci_reset_bus);
 
 /**
+ * pci_try_reset_bus - Try to reset a PCI bus
+ * @bus: top level PCI bus to reset
+ *
+ * Same as above except return -EAGAIN if the bus cannot be locked
+ */
+int pci_try_reset_bus(struct pci_bus *bus)
+{
+        int rc;
+
+        rc = pci_bus_reset(bus, 1);
+        if (rc)
+                return rc;
+
+        pci_bus_save_and_disable(bus);
+
+        if (pci_bus_trylock(bus)) {
+                might_sleep();
+                pci_reset_bridge_secondary_bus(bus->self);
+                pci_bus_unlock(bus);
+        } else
+                rc = -EAGAIN;
+
+        pci_bus_restore(bus);
+
+        return rc;
+}
+EXPORT_SYMBOL_GPL(pci_try_reset_bus);
+
+/**
  * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
  * @dev: PCI device to query
  *
@@ -4450,7 +4410,6 @@ EXPORT_SYMBOL(pci_restore_state);
 EXPORT_SYMBOL(pci_pme_capable);
 EXPORT_SYMBOL(pci_pme_active);
 EXPORT_SYMBOL(pci_wake_from_d3);
-EXPORT_SYMBOL(pci_target_state);
 EXPORT_SYMBOL(pci_prepare_to_sleep);
 EXPORT_SYMBOL(pci_back_from_sleep);
 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);