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authorSergei Shtylyov <sergei.shtylyov@cogentembedded.com>2016-07-07 10:11:45 -0400
committerLinus Walleij <linus.walleij@linaro.org>2016-07-22 09:30:39 -0400
commite79c583023438309fefaaaa9197c327f2614d57a (patch)
tree9ad6bb1a7bd545c432a7634f427b443447a36015
parentee4fc4013e0d62a3669101299dede0216bc6873e (diff)
gpio: rcar: add R8A7792 support
Renesas R8A7792 SoC is a member of the R-Car gen2 family, add support for its GPIO controllers. Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat
-rw-r--r--Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt1
-rw-r--r--drivers/gpio/gpio-rcar.c3
2 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
index f60e2f477e93..8da26b35b5c3 100644
--- a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
+++ b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
@@ -7,6 +7,7 @@ Required Properties:
7 - "renesas,gpio-r8a7779": for R8A7779 (R-Car H1) compatible GPIO controller. 7 - "renesas,gpio-r8a7779": for R8A7779 (R-Car H1) compatible GPIO controller.
8 - "renesas,gpio-r8a7790": for R8A7790 (R-Car H2) compatible GPIO controller. 8 - "renesas,gpio-r8a7790": for R8A7790 (R-Car H2) compatible GPIO controller.
9 - "renesas,gpio-r8a7791": for R8A7791 (R-Car M2-W) compatible GPIO controller. 9 - "renesas,gpio-r8a7791": for R8A7791 (R-Car M2-W) compatible GPIO controller.
10 - "renesas,gpio-r8a7792": for R8A7792 (R-Car V2H) compatible GPIO controller.
10 - "renesas,gpio-r8a7793": for R8A7793 (R-Car M2-N) compatible GPIO controller. 11 - "renesas,gpio-r8a7793": for R8A7793 (R-Car M2-N) compatible GPIO controller.
11 - "renesas,gpio-r8a7794": for R8A7794 (R-Car E2) compatible GPIO controller. 12 - "renesas,gpio-r8a7794": for R8A7794 (R-Car E2) compatible GPIO controller.
12 - "renesas,gpio-r8a7795": for R8A7795 (R-Car H3) compatible GPIO controller. 13 - "renesas,gpio-r8a7795": for R8A7795 (R-Car H3) compatible GPIO controller.
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 681c93fb9e70..b96e0b466f74 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -335,6 +335,9 @@ static const struct of_device_id gpio_rcar_of_table[] = {
335 .compatible = "renesas,gpio-r8a7791", 335 .compatible = "renesas,gpio-r8a7791",
336 .data = &gpio_rcar_info_gen2, 336 .data = &gpio_rcar_info_gen2,
337 }, { 337 }, {
338 .compatible = "renesas,gpio-r8a7792",
339 .data = &gpio_rcar_info_gen2,
340 }, {
338 .compatible = "renesas,gpio-r8a7793", 341 .compatible = "renesas,gpio-r8a7793",
339 .data = &gpio_rcar_info_gen2, 342 .data = &gpio_rcar_info_gen2,
340 }, { 343 }, {
generated by cgit v1.2.2 (git 2.25.0) at 2026-04-30 18:00:38 -0400
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/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/jhash.h>
#include <linux/kthread.h>

#include <rdma/ib_fmr_pool.h>

#include "core_priv.h"

#define PFX "fmr_pool: "

enum {
	IB_FMR_MAX_REMAPS = 32,

	IB_FMR_HASH_BITS  = 8,
	IB_FMR_HASH_SIZE  = 1 << IB_FMR_HASH_BITS,
	IB_FMR_HASH_MASK  = IB_FMR_HASH_SIZE - 1
};

/*
 * If an FMR is not in use, then the list member will point to either
 * its pool's free_list (if the FMR can be mapped again; that is,
 * remap_count < pool->max_remaps) or its pool's dirty_list (if the
 * FMR needs to be unmapped before being remapped).  In either of
 * these cases it is a bug if the ref_count is not 0.  In other words,
 * if ref_count is > 0, then the list member must not be linked into
 * either free_list or dirty_list.
 *
 * The cache_node member is used to link the FMR into a cache bucket
 * (if caching is enabled).  This is independent of the reference
 * count of the FMR.  When a valid FMR is released, its ref_count is
 * decremented, and if ref_count reaches 0, the FMR is placed in
 * either free_list or dirty_list as appropriate.  However, it is not
 * removed from the cache and may be "revived" if a call to
 * ib_fmr_register_physical() occurs before the FMR is remapped.  In
 * this case we just increment the ref_count and remove the FMR from
 * free_list/dirty_list.
 *
 * Before we remap an FMR from free_list, we remove it from the cache
 * (to prevent another user from obtaining a stale FMR).  When an FMR
 * is released, we add it to the tail of the free list, so that our
 * cache eviction policy is "least recently used."
 *
 * All manipulation of ref_count, list and cache_node is protected by
 * pool_lock to maintain consistency.
 */

struct ib_fmr_pool {
	spinlock_t                pool_lock;

	int                       pool_size;
	int                       max_pages;
	int			  max_remaps;
	int                       dirty_watermark;
	int                       dirty_len;
	struct list_head          free_list;
	struct list_head          dirty_list;
	struct hlist_head        *cache_bucket;

	void                     (*flush_function)(struct ib_fmr_pool *pool,
						   void *              arg);
	void                     *flush_arg;

	struct task_struct       *thread;

	atomic_t                  req_ser;
	atomic_t                  flush_ser;

	wait_queue_head_t         force_wait;
};

static inline u32 ib_fmr_hash(u64 first_page)
{
	return jhash_2words((u32) first_page, (u32) (first_page >> 32), 0) &
		(IB_FMR_HASH_SIZE - 1);
}

/* Caller must hold pool_lock */
static inline struct ib_pool_fmr *ib_fmr_cache_lookup(struct ib_fmr_pool *pool,
						      u64 *page_list,
						      int  page_list_len,
						      u64  io_virtual_address)
{
	struct hlist_head *bucket;
	struct ib_pool_fmr *fmr;
	struct hlist_node *pos;

	if (!pool->cache_bucket)
		return NULL;

	bucket = pool->cache_bucket + ib_fmr_hash(*page_list);

	hlist_for_each_entry(fmr, pos, bucket, cache_node)
		if (io_virtual_address == fmr->io_virtual_address &&
		    page_list_len      == fmr->page_list_len      &&
		    !memcmp(page_list, fmr->page_list,
			    page_list_len * sizeof *page_list))
			return fmr;

	return NULL;
}

static void ib_fmr_batch_release(struct ib_fmr_pool *pool)
{
	int                 ret;
	struct ib_pool_fmr *fmr;
	LIST_HEAD(unmap_list);
	LIST_HEAD(fmr_list);

	spin_lock_irq(&pool->pool_lock);

	list_for_each_entry(fmr, &pool->dirty_list, list) {
		hlist_del_init(&fmr->cache_node);
		fmr->remap_count = 0;
		list_add_tail(&fmr->fmr->list, &fmr_list);

#ifdef DEBUG
		if (fmr->ref_count !=0) {
			printk(KERN_WARNING PFX "Unmapping FMR 0x%08x with ref count %d\n",
			       fmr, fmr->ref_count);
		}
#endif
	}

	list_splice_init(&pool->dirty_list, &unmap_list);
	pool->dirty_len = 0;

	spin_unlock_irq(&pool->pool_lock);

	if (list_empty(&unmap_list)) {
		return;
	}

	ret = ib_unmap_fmr(&fmr_list);
	if (ret)
		printk(KERN_WARNING PFX "ib_unmap_fmr returned %d\n", ret);

	spin_lock_irq(&pool->pool_lock);
	list_splice(&unmap_list, &pool->free_list);
	spin_unlock_irq(&pool->pool_lock);
}

static int ib_fmr_cleanup_thread(void *pool_ptr)
{
	struct ib_fmr_pool *pool = pool_ptr;

	do {
		if (atomic_read(&pool->flush_ser) - atomic_read(&pool->req_ser) < 0) {
			ib_fmr_batch_release(pool);

			atomic_inc(&pool->flush_ser);
			wake_up_interruptible(&pool->force_wait);

			if (pool->flush_function)
				pool->flush_function(pool, pool->flush_arg);
		}

		set_current_state(TASK_INTERRUPTIBLE);
		if (atomic_read(&pool->flush_ser) - atomic_read(&pool->req_ser) >= 0 &&
		    !kthread_should_stop())
			schedule();
		__set_current_state(TASK_RUNNING);
	} while (!kthread_should_stop());

	return 0;
}

/**
 * ib_create_fmr_pool - Create an FMR pool
 * @pd:Protection domain for FMRs
 * @params:FMR pool parameters
 *
 * Create a pool of FMRs.  Return value is pointer to new pool or
 * error code if creation failed.
 */
struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd             *pd,
				       struct ib_fmr_pool_param *params)
{
	struct ib_device   *device;
	struct ib_fmr_pool *pool;
	struct ib_device_attr *attr;
	int i;
	int ret;
	int max_remaps;

	if (!params)
		return ERR_PTR(-EINVAL);

	device = pd->device;
	if (!device->alloc_fmr    || !device->dealloc_fmr  ||
	    !device->map_phys_fmr || !device->unmap_fmr) {
		printk(KERN_INFO PFX "Device %s does not support FMRs\n",
		       device->name);
		return ERR_PTR(-ENOSYS);
	}

	attr = kmalloc(sizeof *attr, GFP_KERNEL);
	if (!attr) {
		printk(KERN_WARNING PFX "couldn't allocate device attr struct\n");
		return ERR_PTR(-ENOMEM);
	}

	ret = ib_query_device(device, attr);
	if (ret) {
		printk(KERN_WARNING PFX "couldn't query device: %d\n", ret);
		kfree(attr);
		return ERR_PTR(ret);
	}

	if (!attr->max_map_per_fmr)
		max_remaps = IB_FMR_MAX_REMAPS;
	else
		max_remaps = attr->max_map_per_fmr;

	kfree(attr);

	pool = kmalloc(sizeof *pool, GFP_KERNEL);
	if (!pool) {
		printk(KERN_WARNING PFX "couldn't allocate pool struct\n");
		return ERR_PTR(-ENOMEM);
	}

	pool->cache_bucket   = NULL;

	pool->flush_function = params->flush_function;
	pool->flush_arg      = params->flush_arg;

	INIT_LIST_HEAD(&pool->free_list);
	INIT_LIST_HEAD(&pool->dirty_list);

	if (params->cache) {
		pool->cache_bucket =
			kmalloc(IB_FMR_HASH_SIZE * sizeof *pool->cache_bucket,
				GFP_KERNEL);
		if (!pool->cache_bucket) {
			printk(KERN_WARNING PFX "Failed to allocate cache in pool\n");
			ret = -ENOMEM;
			goto out_free_pool;
		}

		for (i = 0; i < IB_FMR_HASH_SIZE; ++i)
			INIT_HLIST_HEAD(pool->cache_bucket + i);
	}

	pool->pool_size       = 0;
	pool->max_pages       = params->max_pages_per_fmr;
	pool->max_remaps      = max_remaps;
	pool->dirty_watermark = params->dirty_watermark;
	pool->dirty_len       = 0;
	spin_lock_init(&pool->pool_lock);
	atomic_set(&pool->req_ser,   0);
	atomic_set(&pool->flush_ser, 0);
	init_waitqueue_head(&pool->force_wait);

	pool->thread = kthread_run(ib_fmr_cleanup_thread,
				   pool,
				   "ib_fmr(%s)",
				   device->name);
	if (IS_ERR(pool->thread)) {
		printk(KERN_WARNING PFX "couldn't start cleanup thread\n");
		ret = PTR_ERR(pool->thread);
		goto out_free_pool;
	}

	{
		struct ib_pool_fmr *fmr;
		struct ib_fmr_attr fmr_attr = {
			.max_pages  = params->max_pages_per_fmr,
			.max_maps   = pool->max_remaps,
			.page_shift = params->page_shift
		};
		int bytes_per_fmr = sizeof *fmr;

		if (pool->cache_bucket)
			bytes_per_fmr += params->max_pages_per_fmr * sizeof (u64);

		for (i = 0; i < params->pool_size; ++i) {
			fmr = kmalloc(bytes_per_fmr, GFP_KERNEL);
			if (!fmr) {
				printk(KERN_WARNING PFX "failed to allocate fmr "
				       "struct for FMR %d\n", i);
				goto out_fail;
			}

			fmr->pool             = pool;
			fmr->remap_count      = 0;
			fmr->ref_count        = 0;
			INIT_HLIST_NODE(&fmr->cache_node);

			fmr->fmr = ib_alloc_fmr(pd, params->access, &fmr_attr);
			if (IS_ERR(fmr->fmr)) {
				printk(KERN_WARNING PFX "fmr_create failed "
				       "for FMR %d\n", i);
				kfree(fmr);
				goto out_fail;
			}

			list_add_tail(&fmr->list, &pool->free_list);
			++pool->pool_size;
		}
	}

	return pool;

 out_free_pool:
	kfree(pool->cache_bucket);
	kfree(pool);

	return ERR_PTR(ret);

 out_fail:
	ib_destroy_fmr_pool(pool);

	return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(ib_create_fmr_pool);

/**
 * ib_destroy_fmr_pool - Free FMR pool
 * @pool:FMR pool to free
 *
 * Destroy an FMR pool and free all associated resources.
 */
void ib_destroy_fmr_pool(struct ib_fmr_pool *pool)
{
	struct ib_pool_fmr *fmr;
	struct ib_pool_fmr *tmp;
	LIST_HEAD(fmr_list);
	int                 i;

	kthread_stop(pool->thread);
	ib_fmr_batch_release(pool);

	i = 0;
	list_for_each_entry_safe(fmr, tmp, &pool->free_list, list) {
		if (fmr->remap_count) {
			INIT_LIST_HEAD(&fmr_list);
			list_add_tail(&fmr->fmr->list, &fmr_list);
			ib_unmap_fmr(&fmr_list);
		}
		ib_dealloc_fmr(fmr->fmr);
		list_del(&fmr->list);
		kfree(fmr);
		++i;
	}

	if (i < pool->pool_size)
		printk(KERN_WARNING PFX "pool still has %d regions registered\n",
		       pool->pool_size - i);

	kfree(pool->cache_bucket);
	kfree(pool);
}
EXPORT_SYMBOL(ib_destroy_fmr_pool);

/**
 * ib_flush_fmr_pool - Invalidate all unmapped FMRs
 * @pool:FMR pool to flush
 *
 * Ensure that all unmapped FMRs are fully invalidated.
 */
int ib_flush_fmr_pool(struct ib_fmr_pool *pool)
{
	int serial;
	struct ib_pool_fmr *fmr, *next;

	/*
	 * The free_list holds FMRs that may have been used
	 * but have not been remapped enough times to be dirty.
	 * Put them on the dirty list now so that the cleanup
	 * thread will reap them too.
	 */
	spin_lock_irq(&pool->pool_lock);