Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

1 files changed, 861 insertions, 0 deletions

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
new file mode 100644
index 000000000..f075e7881
--- /dev/null
+++ b/drivers/pci/devres.c
@@ -0,0 +1,861 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/device.h>
+#include <linux/pci.h>
+#include "pci.h"
+
+/*
+ * On the state of PCI's devres implementation:
+ *
+ * The older PCI devres API has one significant problem:
+ *
+ * It is very strongly tied to the statically allocated mapping table in struct
+ * pcim_iomap_devres below. This is mostly solved in the sense of the pcim_
+ * functions in this file providing things like ranged mapping by bypassing
+ * this table, whereas the functions that were present in the old API still
+ * enter the mapping addresses into the table for users of the old API.
+ *
+ * TODO:
+ * Remove the legacy table entirely once all calls to pcim_iomap_table() in
+ * the kernel have been removed.
+ */
+
+/*
+ * Legacy struct storing addresses to whole mapped BARs.
+ */
+struct pcim_iomap_devres {
+	void __iomem *table[PCI_NUM_RESOURCES];
+};
+
+/* Used to restore the old INTx state on driver detach. */
+struct pcim_intx_devres {
+	int orig_intx;
+};
+
+enum pcim_addr_devres_type {
+	/* Default initializer. */
+	PCIM_ADDR_DEVRES_TYPE_INVALID,
+
+	/* A requested region spanning an entire BAR. */
+	PCIM_ADDR_DEVRES_TYPE_REGION,
+
+	/*
+	 * A requested region spanning an entire BAR, and a mapping for
+	 * the entire BAR.
+	 */
+	PCIM_ADDR_DEVRES_TYPE_REGION_MAPPING,
+
+	/*
+	 * A mapping within a BAR, either spanning the whole BAR or just a
+	 * range.  Without a requested region.
+	 */
+	PCIM_ADDR_DEVRES_TYPE_MAPPING,
+};
+
+/*
+ * This struct envelops IO or MEM addresses, i.e., mappings and region
+ * requests, because those are very frequently requested and released
+ * together.
+ */
+struct pcim_addr_devres {
+	enum pcim_addr_devres_type type;
+	void __iomem *baseaddr;
+	unsigned long offset;
+	unsigned long len;
+	int bar;
+};
+
+static inline void pcim_addr_devres_clear(struct pcim_addr_devres *res)
+{
+	memset(res, 0, sizeof(*res));
+	res->bar = -1;
+}
+
+static void pcim_addr_resource_release(struct device *dev, void *resource_raw)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pcim_addr_devres *res = resource_raw;
+
+	switch (res->type) {
+	case PCIM_ADDR_DEVRES_TYPE_REGION:
+		pci_release_region(pdev, res->bar);
+		break;
+	case PCIM_ADDR_DEVRES_TYPE_REGION_MAPPING:
+		pci_iounmap(pdev, res->baseaddr);
+		pci_release_region(pdev, res->bar);
+		break;
+	case PCIM_ADDR_DEVRES_TYPE_MAPPING:
+		pci_iounmap(pdev, res->baseaddr);
+		break;
+	default:
+		break;
+	}
+}
+
+static struct pcim_addr_devres *pcim_addr_devres_alloc(struct pci_dev *pdev)
+{
+	struct pcim_addr_devres *res;
+
+	res = devres_alloc_node(pcim_addr_resource_release, sizeof(*res),
+				GFP_KERNEL, dev_to_node(&pdev->dev));
+	if (res)
+		pcim_addr_devres_clear(res);
+	return res;
+}
+
+/* Just for consistency and readability. */
+static inline void pcim_addr_devres_free(struct pcim_addr_devres *res)
+{
+	devres_free(res);
+}
+
+/*
+ * Used by devres to identify a pcim_addr_devres.
+ */
+static int pcim_addr_resources_match(struct device *dev,
+				     void *a_raw, void *b_raw)
+{
+	struct pcim_addr_devres *a, *b;
+
+	a = a_raw;
+	b = b_raw;
+
+	if (a->type != b->type)
+		return 0;
+
+	switch (a->type) {
+	case PCIM_ADDR_DEVRES_TYPE_REGION:
+	case PCIM_ADDR_DEVRES_TYPE_REGION_MAPPING:
+		return a->bar == b->bar;
+	case PCIM_ADDR_DEVRES_TYPE_MAPPING:
+		return a->baseaddr == b->baseaddr;
+	default:
+		return 0;
+	}
+}
+
+static void devm_pci_unmap_iospace(struct device *dev, void *ptr)
+{
+	struct resource **res = ptr;
+
+	pci_unmap_iospace(*res);
+}
+
+/**
+ * devm_pci_remap_iospace - Managed pci_remap_iospace()
+ * @dev: Generic device to remap IO address for
+ * @res: Resource describing the I/O space
+ * @phys_addr: physical address of range to be mapped
+ *
+ * Managed pci_remap_iospace().  Map is automatically unmapped on driver
+ * detach.
+ */
+int devm_pci_remap_iospace(struct device *dev, const struct resource *res,
+			   phys_addr_t phys_addr)
+{
+	const struct resource **ptr;
+	int error;
+
+	ptr = devres_alloc(devm_pci_unmap_iospace, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	error = pci_remap_iospace(res, phys_addr);
+	if (error) {
+		devres_free(ptr);
+	} else	{
+		*ptr = res;
+		devres_add(dev, ptr);
+	}
+
+	return error;
+}
+EXPORT_SYMBOL(devm_pci_remap_iospace);
+
+/**
+ * devm_pci_remap_cfgspace - Managed pci_remap_cfgspace()
+ * @dev: Generic device to remap IO address for
+ * @offset: Resource address to map
+ * @size: Size of map
+ *
+ * Managed pci_remap_cfgspace().  Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem *devm_pci_remap_cfgspace(struct device *dev,
+				      resource_size_t offset,
+				      resource_size_t size)
+{
+	void __iomem **ptr, *addr;
+
+	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return NULL;
+
+	addr = pci_remap_cfgspace(offset, size);
+	if (addr) {
+		*ptr = addr;
+		devres_add(dev, ptr);
+	} else
+		devres_free(ptr);
+
+	return addr;
+}
+EXPORT_SYMBOL(devm_pci_remap_cfgspace);
+
+/**
+ * devm_pci_remap_cfg_resource - check, request region and ioremap cfg resource
+ * @dev: generic device to handle the resource for
+ * @res: configuration space resource to be handled
+ *
+ * Checks that a resource is a valid memory region, requests the memory
+ * region and ioremaps with pci_remap_cfgspace() API that ensures the
+ * proper PCI configuration space memory attributes are guaranteed.
+ *
+ * All operations are managed and will be undone on driver detach.
+ *
+ * Returns a pointer to the remapped memory or an IOMEM_ERR_PTR() encoded error
+ * code on failure. Usage example::
+ *
+ *	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ *	base = devm_pci_remap_cfg_resource(&pdev->dev, res);
+ *	if (IS_ERR(base))
+ *		return PTR_ERR(base);
+ */
+void __iomem *devm_pci_remap_cfg_resource(struct device *dev,
+					  struct resource *res)
+{
+	resource_size_t size;
+	const char *name;
+	void __iomem *dest_ptr;
+
+	BUG_ON(!dev);
+
+	if (!res || resource_type(res) != IORESOURCE_MEM) {
+		dev_err(dev, "invalid resource\n");
+		return IOMEM_ERR_PTR(-EINVAL);
+	}
+
+	size = resource_size(res);
+
+	if (res->name)
+		name = devm_kasprintf(dev, GFP_KERNEL, "%s %s", dev_name(dev),
+				      res->name);
+	else
+		name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
+	if (!name)
+		return IOMEM_ERR_PTR(-ENOMEM);
+
+	if (!devm_request_mem_region(dev, res->start, size, name)) {
+		dev_err(dev, "can't request region for resource %pR\n", res);
+		return IOMEM_ERR_PTR(-EBUSY);
+	}
+
+	dest_ptr = devm_pci_remap_cfgspace(dev, res->start, size);
+	if (!dest_ptr) {
+		dev_err(dev, "ioremap failed for resource %pR\n", res);
+		devm_release_mem_region(dev, res->start, size);
+		dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
+	}
+
+	return dest_ptr;
+}
+EXPORT_SYMBOL(devm_pci_remap_cfg_resource);
+
+static void __pcim_clear_mwi(void *pdev_raw)
+{
+	struct pci_dev *pdev = pdev_raw;
+
+	pci_clear_mwi(pdev);
+}
+
+/**
+ * pcim_set_mwi - a device-managed pci_set_mwi()
+ * @pdev: the PCI device for which MWI is enabled
+ *
+ * Managed pci_set_mwi().
+ *
+ * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
+ */
+int pcim_set_mwi(struct pci_dev *pdev)
+{
+	int ret;
+
+	ret = devm_add_action(&pdev->dev, __pcim_clear_mwi, pdev);
+	if (ret != 0)
+		return ret;
+
+	ret = pci_set_mwi(pdev);
+	if (ret != 0)
+		devm_remove_action(&pdev->dev, __pcim_clear_mwi, pdev);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcim_set_mwi);
+
+static inline bool mask_contains_bar(int mask, int bar)
+{
+	return mask & BIT(bar);
+}
+
+static void pcim_intx_restore(struct device *dev, void *data)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pcim_intx_devres *res = data;
+
+	pci_intx(pdev, res->orig_intx);
+}
+
+static void save_orig_intx(struct pci_dev *pdev, struct pcim_intx_devres *res)
+{
+	u16 pci_command;
+
+	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
+	res->orig_intx = !(pci_command & PCI_COMMAND_INTX_DISABLE);
+}
+
+/**
+ * pcim_intx - managed pci_intx()
+ * @pdev: the PCI device to operate on
+ * @enable: boolean: whether to enable or disable PCI INTx
+ *
+ * Returns: 0 on success, -ENOMEM on error.
+ *
+ * Enable/disable PCI INTx for device @pdev.
+ * Restore the original state on driver detach.
+ */
+int pcim_intx(struct pci_dev *pdev, int enable)
+{
+	struct pcim_intx_devres *res;
+	struct device *dev = &pdev->dev;
+
+	/*
+	 * pcim_intx() must only restore the INTx value that existed before the
+	 * driver was loaded, i.e., before it called pcim_intx() for the
+	 * first time.
+	 */
+	res = devres_find(dev, pcim_intx_restore, NULL, NULL);
+	if (!res) {
+		res = devres_alloc(pcim_intx_restore, sizeof(*res), GFP_KERNEL);
+		if (!res)
+			return -ENOMEM;
+
+		save_orig_intx(pdev, res);
+		devres_add(dev, res);
+	}
+
+	pci_intx(pdev, enable);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pcim_intx);
+
+static void pcim_disable_device(void *pdev_raw)
+{
+	struct pci_dev *pdev = pdev_raw;
+
+	if (!pdev->pinned)
+		pci_disable_device(pdev);
+
+	pdev->is_managed = false;
+}
+
+/**
+ * pcim_enable_device - Managed pci_enable_device()
+ * @pdev: PCI device to be initialized
+ *
+ * Returns: 0 on success, negative error code on failure.
+ *
+ * Managed pci_enable_device(). Device will automatically be disabled on
+ * driver detach.
+ */
+int pcim_enable_device(struct pci_dev *pdev)
+{
+	int ret;
+
+	ret = devm_add_action(&pdev->dev, pcim_disable_device, pdev);
+	if (ret != 0)
+		return ret;
+
+	/*
+	 * We prefer removing the action in case of an error over
+	 * devm_add_action_or_reset() because the latter could theoretically be
+	 * disturbed by users having pinned the device too soon.
+	 */
+	ret = pci_enable_device(pdev);
+	if (ret != 0) {
+		devm_remove_action(&pdev->dev, pcim_disable_device, pdev);
+		return ret;
+	}
+
+	pdev->is_managed = true;
+
+	return ret;
+}
+EXPORT_SYMBOL(pcim_enable_device);
+
+/**
+ * pcim_pin_device - Pin managed PCI device
+ * @pdev: PCI device to pin
+ *
+ * Pin managed PCI device @pdev. Pinned device won't be disabled on driver
+ * detach. @pdev must have been enabled with pcim_enable_device().
+ */
+void pcim_pin_device(struct pci_dev *pdev)
+{
+	pdev->pinned = true;
+}
+EXPORT_SYMBOL(pcim_pin_device);
+
+static void pcim_iomap_release(struct device *gendev, void *res)
+{
+	/*
+	 * Do nothing. This is legacy code.
+	 *
+	 * Cleanup of the mappings is now done directly through the callbacks
+	 * registered when creating them.
+	 */
+}
+
+/**
+ * pcim_iomap_table - access iomap allocation table (DEPRECATED)
+ * @pdev: PCI device to access iomap table for
+ *
+ * Returns:
+ * Const pointer to array of __iomem pointers on success, NULL on failure.
+ *
+ * Access iomap allocation table for @dev.  If iomap table doesn't
+ * exist and @pdev is managed, it will be allocated.  All iomaps
+ * recorded in the iomap table are automatically unmapped on driver
+ * detach.
+ *
+ * This function might sleep when the table is first allocated but can
+ * be safely called without context and guaranteed to succeed once
+ * allocated.
+ *
+ * This function is DEPRECATED. Do not use it in new code. Instead, obtain a
+ * mapping's address directly from one of the pcim_* mapping functions. For
+ * example:
+ * void __iomem \*mappy = pcim_iomap(pdev, bar, length);
+ */
+void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
+{
+	struct pcim_iomap_devres *dr, *new_dr;
+
+	dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
+	if (dr)
+		return dr->table;
+
+	new_dr = devres_alloc_node(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL,
+				   dev_to_node(&pdev->dev));
+	if (!new_dr)
+		return NULL;
+	dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
+	return dr->table;
+}
+EXPORT_SYMBOL(pcim_iomap_table);
+
+/*
+ * Fill the legacy mapping-table, so that drivers using the old API can
+ * still get a BAR's mapping address through pcim_iomap_table().
+ */
+static int pcim_add_mapping_to_legacy_table(struct pci_dev *pdev,
+					    void __iomem *mapping, int bar)
+{
+	void __iomem **legacy_iomap_table;
+
+	if (!pci_bar_index_is_valid(bar))
+		return -EINVAL;
+
+	legacy_iomap_table = (void __iomem **)pcim_iomap_table(pdev);
+	if (!legacy_iomap_table)
+		return -ENOMEM;
+
+	legacy_iomap_table[bar] = mapping;
+
+	return 0;
+}
+
+/*
+ * Remove a mapping. The table only contains whole-BAR mappings, so this will
+ * never interfere with ranged mappings.
+ */
+static void pcim_remove_mapping_from_legacy_table(struct pci_dev *pdev,
+						  void __iomem *addr)
+{
+	int bar;
+	void __iomem **legacy_iomap_table;
+
+	legacy_iomap_table = (void __iomem **)pcim_iomap_table(pdev);
+	if (!legacy_iomap_table)
+		return;
+
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
+		if (legacy_iomap_table[bar] == addr) {
+			legacy_iomap_table[bar] = NULL;
+			return;
+		}
+	}
+}
+
+/*
+ * The same as pcim_remove_mapping_from_legacy_table(), but identifies the
+ * mapping by its BAR index.
+ */
+static void pcim_remove_bar_from_legacy_table(struct pci_dev *pdev, int bar)
+{
+	void __iomem **legacy_iomap_table;
+
+	if (!pci_bar_index_is_valid(bar))
+		return;
+
+	legacy_iomap_table = (void __iomem **)pcim_iomap_table(pdev);
+	if (!legacy_iomap_table)
+		return;
+
+	legacy_iomap_table[bar] = NULL;
+}
+
+/**
+ * pcim_iomap - Managed pcim_iomap()
+ * @pdev: PCI device to iomap for
+ * @bar: BAR to iomap
+ * @maxlen: Maximum length of iomap
+ *
+ * Returns: __iomem pointer on success, NULL on failure.
+ *
+ * Managed pci_iomap(). Map is automatically unmapped on driver detach. If
+ * desired, unmap manually only with pcim_iounmap().
+ *
+ * This SHOULD only be used once per BAR.
+ *
+ * NOTE:
+ * Contrary to the other pcim_* functions, this function does not return an
+ * IOMEM_ERR_PTR() on failure, but a simple NULL. This is done for backwards
+ * compatibility.
+ */
+void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
+{
+	void __iomem *mapping;
+	struct pcim_addr_devres *res;
+
+	if (!pci_bar_index_is_valid(bar))
+		return NULL;
+
+	res = pcim_addr_devres_alloc(pdev);
+	if (!res)
+		return NULL;
+	res->type = PCIM_ADDR_DEVRES_TYPE_MAPPING;
+
+	mapping = pci_iomap(pdev, bar, maxlen);
+	if (!mapping)
+		goto err_iomap;
+	res->baseaddr = mapping;
+
+	if (pcim_add_mapping_to_legacy_table(pdev, mapping, bar) != 0)
+		goto err_table;
+
+	devres_add(&pdev->dev, res);
+	return mapping;
+
+err_table:
+	pci_iounmap(pdev, mapping);
+err_iomap:
+	pcim_addr_devres_free(res);
+	return NULL;
+}
+EXPORT_SYMBOL(pcim_iomap);
+
+/**
+ * pcim_iounmap - Managed pci_iounmap()
+ * @pdev: PCI device to iounmap for
+ * @addr: Address to unmap
+ *
+ * Managed pci_iounmap(). @addr must have been mapped using a pcim_* mapping
+ * function.
+ */
+void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
+{
+	struct pcim_addr_devres res_searched;
+
+	pcim_addr_devres_clear(&res_searched);
+	res_searched.type = PCIM_ADDR_DEVRES_TYPE_MAPPING;
+	res_searched.baseaddr = addr;
+
+	if (devres_release(&pdev->dev, pcim_addr_resource_release,
+			pcim_addr_resources_match, &res_searched) != 0) {
+		/* Doesn't exist. User passed nonsense. */
+		return;
+	}
+
+	pcim_remove_mapping_from_legacy_table(pdev, addr);
+}
+EXPORT_SYMBOL(pcim_iounmap);
+
+/**
+ * pcim_iomap_region - Request and iomap a PCI BAR
+ * @pdev: PCI device to map IO resources for
+ * @bar: Index of a BAR to map
+ * @name: Name of the driver requesting the resource
+ *
+ * Returns: __iomem pointer on success, an IOMEM_ERR_PTR on failure.
+ *
+ * Mapping and region will get automatically released on driver detach. If
+ * desired, release manually only with pcim_iounmap_region().
+ */
+void __iomem *pcim_iomap_region(struct pci_dev *pdev, int bar,
+				       const char *name)
+{
+	int ret;
+	struct pcim_addr_devres *res;
+
+	if (!pci_bar_index_is_valid(bar))
+		return IOMEM_ERR_PTR(-EINVAL);
+
+	res = pcim_addr_devres_alloc(pdev);
+	if (!res)
+		return IOMEM_ERR_PTR(-ENOMEM);
+
+	res->type = PCIM_ADDR_DEVRES_TYPE_REGION_MAPPING;
+	res->bar = bar;
+
+	ret = pci_request_region(pdev, bar, name);
+	if (ret != 0)
+		goto err_region;
+
+	res->baseaddr = pci_iomap(pdev, bar, 0);
+	if (!res->baseaddr) {
+		ret = -EINVAL;
+		goto err_iomap;
+	}
+
+	devres_add(&pdev->dev, res);
+	return res->baseaddr;
+
+err_iomap:
+	pci_release_region(pdev, bar);
+err_region:
+	pcim_addr_devres_free(res);
+
+	return IOMEM_ERR_PTR(ret);
+}
+EXPORT_SYMBOL(pcim_iomap_region);
+
+/**
+ * pcim_iounmap_region - Unmap and release a PCI BAR
+ * @pdev: PCI device to operate on
+ * @bar: Index of BAR to unmap and release
+ *
+ * Unmap a BAR and release its region manually. Only pass BARs that were
+ * previously mapped by pcim_iomap_region().
+ */
+void pcim_iounmap_region(struct pci_dev *pdev, int bar)
+{
+	struct pcim_addr_devres res_searched;
+
+	pcim_addr_devres_clear(&res_searched);
+	res_searched.type = PCIM_ADDR_DEVRES_TYPE_REGION_MAPPING;
+	res_searched.bar = bar;
+
+	devres_release(&pdev->dev, pcim_addr_resource_release,
+			pcim_addr_resources_match, &res_searched);
+}
+EXPORT_SYMBOL(pcim_iounmap_region);
+
+/**
+ * pcim_iomap_regions - Request and iomap PCI BARs (DEPRECATED)
+ * @pdev: PCI device to map IO resources for
+ * @mask: Mask of BARs to request and iomap
+ * @name: Name of the driver requesting the resources
+ *
+ * Returns: 0 on success, negative error code on failure.
+ *
+ * Request and iomap regions specified by @mask.
+ *
+ * This function is DEPRECATED. Do not use it in new code.
+ * Use pcim_iomap_region() instead.
+ */
+int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
+{
+	int ret;
+	int bar;
+	void __iomem *mapping;
+
+	for (bar = 0; bar < DEVICE_COUNT_RESOURCE; bar++) {
+		if (!mask_contains_bar(mask, bar))
+			continue;
+
+		mapping = pcim_iomap_region(pdev, bar, name);
+		if (IS_ERR(mapping)) {
+			ret = PTR_ERR(mapping);
+			goto err;
+		}
+		ret = pcim_add_mapping_to_legacy_table(pdev, mapping, bar);
+		if (ret != 0)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	while (--bar >= 0) {
+		pcim_iounmap_region(pdev, bar);
+		pcim_remove_bar_from_legacy_table(pdev, bar);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(pcim_iomap_regions);
+
+/**
+ * pcim_request_region - Request a PCI BAR
+ * @pdev: PCI device to request region for
+ * @bar: Index of BAR to request
+ * @name: Name of the driver requesting the resource
+ *
+ * Returns: 0 on success, a negative error code on failure.
+ *
+ * Request region specified by @bar.
+ *
+ * The region will automatically be released on driver detach. If desired,
+ * release manually only with pcim_release_region().
+ */
+int pcim_request_region(struct pci_dev *pdev, int bar, const char *name)
+{
+	int ret;
+	struct pcim_addr_devres *res;
+
+	if (!pci_bar_index_is_valid(bar))
+		return -EINVAL;
+
+	res = pcim_addr_devres_alloc(pdev);
+	if (!res)
+		return -ENOMEM;
+	res->type = PCIM_ADDR_DEVRES_TYPE_REGION;
+	res->bar = bar;
+
+	ret = pci_request_region(pdev, bar, name);
+	if (ret != 0) {
+		pcim_addr_devres_free(res);
+		return ret;
+	}
+
+	devres_add(&pdev->dev, res);
+	return 0;
+}
+EXPORT_SYMBOL(pcim_request_region);
+
+/**
+ * pcim_release_region - Release a PCI BAR
+ * @pdev: PCI device to operate on
+ * @bar: Index of BAR to release
+ *
+ * Release a region manually that was previously requested by
+ * pcim_request_region().
+ */
+static void pcim_release_region(struct pci_dev *pdev, int bar)
+{
+	struct pcim_addr_devres res_searched;
+
+	pcim_addr_devres_clear(&res_searched);
+	res_searched.type = PCIM_ADDR_DEVRES_TYPE_REGION;
+	res_searched.bar = bar;
+
+	devres_release(&pdev->dev, pcim_addr_resource_release,
+			pcim_addr_resources_match, &res_searched);
+}
+
+
+/**
+ * pcim_release_all_regions - Release all regions of a PCI-device
+ * @pdev: the PCI device
+ *
+ * Release all regions previously requested through pcim_request_region()
+ * or pcim_request_all_regions().
+ *
+ * Can be called from any context, i.e., not necessarily as a counterpart to
+ * pcim_request_all_regions().
+ */
+static void pcim_release_all_regions(struct pci_dev *pdev)
+{
+	int bar;
+
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
+		pcim_release_region(pdev, bar);
+}
+
+/**
+ * pcim_request_all_regions - Request all regions
+ * @pdev: PCI device to map IO resources for
+ * @name: name of the driver requesting the resources
+ *
+ * Returns: 0 on success, negative error code on failure.
+ *
+ * Requested regions will automatically be released at driver detach. If
+ * desired, release individual regions with pcim_release_region() or all of
+ * them at once with pcim_release_all_regions().
+ */
+int pcim_request_all_regions(struct pci_dev *pdev, const char *name)
+{
+	int ret;
+	int bar;
+
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
+		ret = pcim_request_region(pdev, bar, name);
+		if (ret != 0)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	pcim_release_all_regions(pdev);
+
+	return ret;
+}
+EXPORT_SYMBOL(pcim_request_all_regions);
+
+/**
+ * pcim_iomap_range - Create a ranged __iomap mapping within a PCI BAR
+ * @pdev: PCI device to map IO resources for
+ * @bar: Index of the BAR
+ * @offset: Offset from the begin of the BAR
+ * @len: Length in bytes for the mapping
+ *
+ * Returns: __iomem pointer on success, an IOMEM_ERR_PTR on failure.
+ *
+ * Creates a new IO-Mapping within the specified @bar, ranging from @offset to
+ * @offset + @len.
+ *
+ * The mapping will automatically get unmapped on driver detach. If desired,
+ * release manually only with pcim_iounmap().
+ */
+void __iomem *pcim_iomap_range(struct pci_dev *pdev, int bar,
+		unsigned long offset, unsigned long len)
+{
+	void __iomem *mapping;
+	struct pcim_addr_devres *res;
+
+	if (!pci_bar_index_is_valid(bar))
+		return IOMEM_ERR_PTR(-EINVAL);
+
+	res = pcim_addr_devres_alloc(pdev);
+	if (!res)
+		return IOMEM_ERR_PTR(-ENOMEM);
+
+	mapping = pci_iomap_range(pdev, bar, offset, len);
+	if (!mapping) {
+		pcim_addr_devres_free(res);
+		return IOMEM_ERR_PTR(-EINVAL);
+	}
+
+	res->type = PCIM_ADDR_DEVRES_TYPE_MAPPING;
+	res->baseaddr = mapping;
+
+	/*
+	 * Ranged mappings don't get added to the legacy-table, since the table
+	 * only ever keeps track of whole BARs.
+	 */
+
+	devres_add(&pdev->dev, res);
+	return mapping;
+}
+EXPORT_SYMBOL(pcim_iomap_range);