967e012ef3
irq_radix_revmap() currently serves 2 purposes, irq mapping lookup and insertion which happen in interrupt and process context respectively. Separate the function into its 2 components, one for lookup only and one for insertion only. Fix the only user of the revmap tree (XICS) to use the new functions. Also, move the insertion into the radix tree of those irqs that were requested before it was initialized at said tree initialization. Mutual exclusion between the tree initialization and readers/writers is handled via a state variable (revmap_trees_allocated) set to 1 when the tree has been initialized and set to 2 after the already requested irqs have been inserted in the tree by the init path. This state is checked before any reader or writer access just like we used to check for tree.gfp_mask != 0 before. Finally, now that we're not any longer inserting nodes into the radix-tree in interrupt context, turn the GFP_ATOMIC allocations into GFP_KERNEL ones. Signed-off-by: Sebastien Dugue <sebastien.dugue@bull.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
379 lines
13 KiB
C
379 lines
13 KiB
C
#ifdef __KERNEL__
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#ifndef _ASM_POWERPC_IRQ_H
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#define _ASM_POWERPC_IRQ_H
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/threads.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <asm/types.h>
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#include <asm/atomic.h>
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#define get_irq_desc(irq) (&irq_desc[(irq)])
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/* Define a way to iterate across irqs. */
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#define for_each_irq(i) \
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for ((i) = 0; (i) < NR_IRQS; ++(i))
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extern atomic_t ppc_n_lost_interrupts;
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/* This number is used when no interrupt has been assigned */
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#define NO_IRQ (0)
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/* This is a special irq number to return from get_irq() to tell that
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* no interrupt happened _and_ ignore it (don't count it as bad). Some
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* platforms like iSeries rely on that.
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*/
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#define NO_IRQ_IGNORE ((unsigned int)-1)
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/* Total number of virq in the platform (make it a CONFIG_* option ? */
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#define NR_IRQS 512
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/* Number of irqs reserved for the legacy controller */
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#define NUM_ISA_INTERRUPTS 16
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/* This type is the placeholder for a hardware interrupt number. It has to
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* be big enough to enclose whatever representation is used by a given
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* platform.
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*/
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typedef unsigned long irq_hw_number_t;
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/* Interrupt controller "host" data structure. This could be defined as a
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* irq domain controller. That is, it handles the mapping between hardware
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* and virtual interrupt numbers for a given interrupt domain. The host
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* structure is generally created by the PIC code for a given PIC instance
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* (though a host can cover more than one PIC if they have a flat number
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* model). It's the host callbacks that are responsible for setting the
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* irq_chip on a given irq_desc after it's been mapped.
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*
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* The host code and data structures are fairly agnostic to the fact that
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* we use an open firmware device-tree. We do have references to struct
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* device_node in two places: in irq_find_host() to find the host matching
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* a given interrupt controller node, and of course as an argument to its
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* counterpart host->ops->match() callback. However, those are treated as
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* generic pointers by the core and the fact that it's actually a device-node
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* pointer is purely a convention between callers and implementation. This
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* code could thus be used on other architectures by replacing those two
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* by some sort of arch-specific void * "token" used to identify interrupt
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* controllers.
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*/
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struct irq_host;
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struct radix_tree_root;
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/* Functions below are provided by the host and called whenever a new mapping
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* is created or an old mapping is disposed. The host can then proceed to
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* whatever internal data structures management is required. It also needs
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* to setup the irq_desc when returning from map().
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*/
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struct irq_host_ops {
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/* Match an interrupt controller device node to a host, returns
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* 1 on a match
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*/
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int (*match)(struct irq_host *h, struct device_node *node);
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/* Create or update a mapping between a virtual irq number and a hw
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* irq number. This is called only once for a given mapping.
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*/
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int (*map)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
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/* Dispose of such a mapping */
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void (*unmap)(struct irq_host *h, unsigned int virq);
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/* Update of such a mapping */
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void (*remap)(struct irq_host *h, unsigned int virq, irq_hw_number_t hw);
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/* Translate device-tree interrupt specifier from raw format coming
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* from the firmware to a irq_hw_number_t (interrupt line number) and
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* type (sense) that can be passed to set_irq_type(). In the absence
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* of this callback, irq_create_of_mapping() and irq_of_parse_and_map()
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* will return the hw number in the first cell and IRQ_TYPE_NONE for
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* the type (which amount to keeping whatever default value the
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* interrupt controller has for that line)
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*/
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int (*xlate)(struct irq_host *h, struct device_node *ctrler,
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u32 *intspec, unsigned int intsize,
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irq_hw_number_t *out_hwirq, unsigned int *out_type);
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};
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struct irq_host {
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struct list_head link;
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/* type of reverse mapping technique */
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unsigned int revmap_type;
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#define IRQ_HOST_MAP_LEGACY 0 /* legacy 8259, gets irqs 1..15 */
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#define IRQ_HOST_MAP_NOMAP 1 /* no fast reverse mapping */
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#define IRQ_HOST_MAP_LINEAR 2 /* linear map of interrupts */
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#define IRQ_HOST_MAP_TREE 3 /* radix tree */
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union {
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struct {
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unsigned int size;
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unsigned int *revmap;
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} linear;
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struct radix_tree_root tree;
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} revmap_data;
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struct irq_host_ops *ops;
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void *host_data;
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irq_hw_number_t inval_irq;
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/* Optional device node pointer */
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struct device_node *of_node;
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};
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/* The main irq map itself is an array of NR_IRQ entries containing the
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* associate host and irq number. An entry with a host of NULL is free.
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* An entry can be allocated if it's free, the allocator always then sets
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* hwirq first to the host's invalid irq number and then fills ops.
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*/
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struct irq_map_entry {
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irq_hw_number_t hwirq;
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struct irq_host *host;
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};
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extern struct irq_map_entry irq_map[NR_IRQS];
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extern irq_hw_number_t virq_to_hw(unsigned int virq);
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/**
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* irq_alloc_host - Allocate a new irq_host data structure
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* @of_node: optional device-tree node of the interrupt controller
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* @revmap_type: type of reverse mapping to use
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* @revmap_arg: for IRQ_HOST_MAP_LINEAR linear only: size of the map
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* @ops: map/unmap host callbacks
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* @inval_irq: provide a hw number in that host space that is always invalid
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*
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* Allocates and initialize and irq_host structure. Note that in the case of
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* IRQ_HOST_MAP_LEGACY, the map() callback will be called before this returns
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* for all legacy interrupts except 0 (which is always the invalid irq for
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* a legacy controller). For a IRQ_HOST_MAP_LINEAR, the map is allocated by
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* this call as well. For a IRQ_HOST_MAP_TREE, the radix tree will be allocated
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* later during boot automatically (the reverse mapping will use the slow path
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* until that happens).
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*/
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extern struct irq_host *irq_alloc_host(struct device_node *of_node,
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unsigned int revmap_type,
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unsigned int revmap_arg,
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struct irq_host_ops *ops,
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irq_hw_number_t inval_irq);
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/**
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* irq_find_host - Locates a host for a given device node
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* @node: device-tree node of the interrupt controller
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*/
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extern struct irq_host *irq_find_host(struct device_node *node);
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/**
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* irq_set_default_host - Set a "default" host
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* @host: default host pointer
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*
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* For convenience, it's possible to set a "default" host that will be used
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* whenever NULL is passed to irq_create_mapping(). It makes life easier for
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* platforms that want to manipulate a few hard coded interrupt numbers that
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* aren't properly represented in the device-tree.
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*/
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extern void irq_set_default_host(struct irq_host *host);
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/**
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* irq_set_virq_count - Set the maximum number of virt irqs
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* @count: number of linux virtual irqs, capped with NR_IRQS
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*
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* This is mainly for use by platforms like iSeries who want to program
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* the virtual irq number in the controller to avoid the reverse mapping
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*/
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extern void irq_set_virq_count(unsigned int count);
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/**
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* irq_create_mapping - Map a hardware interrupt into linux virq space
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* @host: host owning this hardware interrupt or NULL for default host
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* @hwirq: hardware irq number in that host space
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*
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* Only one mapping per hardware interrupt is permitted. Returns a linux
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* virq number.
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* If the sense/trigger is to be specified, set_irq_type() should be called
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* on the number returned from that call.
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*/
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extern unsigned int irq_create_mapping(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_dispose_mapping - Unmap an interrupt
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* @virq: linux virq number of the interrupt to unmap
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*/
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extern void irq_dispose_mapping(unsigned int virq);
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/**
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* irq_find_mapping - Find a linux virq from an hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a slow path, for use by generic code. It's expected that an
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* irq controller implementation directly calls the appropriate low level
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* mapping function.
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*/
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extern unsigned int irq_find_mapping(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_create_direct_mapping - Allocate a virq for direct mapping
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* @host: host to allocate the virq for or NULL for default host
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*
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* This routine is used for irq controllers which can choose the hardware
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* interrupt numbers they generate. In such a case it's simplest to use
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* the linux virq as the hardware interrupt number.
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*/
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extern unsigned int irq_create_direct_mapping(struct irq_host *host);
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/**
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* irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping.
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* @host: host owning this hardware interrupt
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* @virq: linux irq number
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* @hwirq: hardware irq number in that host space
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*
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* This is for use by irq controllers that use a radix tree reverse
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* mapping for fast lookup.
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*/
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extern void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
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irq_hw_number_t hwirq);
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/**
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* irq_radix_revmap_lookup - Find a linux virq from a hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a fast path, for use by irq controller code that uses radix tree
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* revmaps
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*/
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extern unsigned int irq_radix_revmap_lookup(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_linear_revmap - Find a linux virq from a hw irq number.
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* @host: host owning this hardware interrupt
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* @hwirq: hardware irq number in that host space
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*
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* This is a fast path, for use by irq controller code that uses linear
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* revmaps. It does fallback to the slow path if the revmap doesn't exist
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* yet and will create the revmap entry with appropriate locking
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*/
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extern unsigned int irq_linear_revmap(struct irq_host *host,
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irq_hw_number_t hwirq);
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/**
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* irq_alloc_virt - Allocate virtual irq numbers
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* @host: host owning these new virtual irqs
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* @count: number of consecutive numbers to allocate
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* @hint: pass a hint number, the allocator will try to use a 1:1 mapping
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*
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* This is a low level function that is used internally by irq_create_mapping()
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* and that can be used by some irq controllers implementations for things
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* like allocating ranges of numbers for MSIs. The revmaps are left untouched.
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*/
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extern unsigned int irq_alloc_virt(struct irq_host *host,
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unsigned int count,
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unsigned int hint);
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/**
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* irq_free_virt - Free virtual irq numbers
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* @virq: virtual irq number of the first interrupt to free
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* @count: number of interrupts to free
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*
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* This function is the opposite of irq_alloc_virt. It will not clear reverse
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* maps, this should be done previously by unmap'ing the interrupt. In fact,
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* all interrupts covered by the range being freed should have been unmapped
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* prior to calling this.
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*/
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extern void irq_free_virt(unsigned int virq, unsigned int count);
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/* -- OF helpers -- */
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/* irq_create_of_mapping - Map a hardware interrupt into linux virq space
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* @controller: Device node of the interrupt controller
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* @inspec: Interrupt specifier from the device-tree
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* @intsize: Size of the interrupt specifier from the device-tree
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*
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* This function is identical to irq_create_mapping except that it takes
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* as input informations straight from the device-tree (typically the results
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* of the of_irq_map_*() functions.
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*/
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extern unsigned int irq_create_of_mapping(struct device_node *controller,
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u32 *intspec, unsigned int intsize);
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/* irq_of_parse_and_map - Parse nad Map an interrupt into linux virq space
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* @device: Device node of the device whose interrupt is to be mapped
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* @index: Index of the interrupt to map
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*
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* This function is a wrapper that chains of_irq_map_one() and
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* irq_create_of_mapping() to make things easier to callers
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*/
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extern unsigned int irq_of_parse_and_map(struct device_node *dev, int index);
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/* -- End OF helpers -- */
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/**
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* irq_early_init - Init irq remapping subsystem
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*/
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extern void irq_early_init(void);
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static __inline__ int irq_canonicalize(int irq)
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{
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return irq;
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}
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extern int distribute_irqs;
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struct irqaction;
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struct pt_regs;
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#define __ARCH_HAS_DO_SOFTIRQ
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#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
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/*
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* Per-cpu stacks for handling critical, debug and machine check
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* level interrupts.
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*/
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extern struct thread_info *critirq_ctx[NR_CPUS];
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extern struct thread_info *dbgirq_ctx[NR_CPUS];
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extern struct thread_info *mcheckirq_ctx[NR_CPUS];
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extern void exc_lvl_ctx_init(void);
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#else
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#define exc_lvl_ctx_init()
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#endif
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#ifdef CONFIG_IRQSTACKS
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/*
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* Per-cpu stacks for handling hard and soft interrupts.
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*/
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extern struct thread_info *hardirq_ctx[NR_CPUS];
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extern struct thread_info *softirq_ctx[NR_CPUS];
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extern void irq_ctx_init(void);
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extern void call_do_softirq(struct thread_info *tp);
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extern int call_handle_irq(int irq, void *p1,
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struct thread_info *tp, void *func);
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#else
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#define irq_ctx_init()
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#endif /* CONFIG_IRQSTACKS */
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extern void do_IRQ(struct pt_regs *regs);
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#endif /* _ASM_IRQ_H */
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#endif /* __KERNEL__ */
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