/*
 * DMA memory management for framework level HCD code (hc_driver)
 *
 * This implementation plugs in through generic "usb_bus" level methods,
 * and should work with all USB controllers, regardless of bus type.
 *
 * Released under the GPLv2 only.
 * SPDX-License-Identifier: GPL-2.0
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>


/*
 * DMA-Coherent Buffers
 */

/* FIXME tune these based on pool statistics ... */
static size_t pool_max[HCD_BUFFER_POOLS] = {
	32, 128, 512, 2048,
};

void __init usb_init_pool_max(void)
{
	/*
	 * The pool_max values must never be smaller than
	 * ARCH_KMALLOC_MINALIGN.
	 */
	if (ARCH_KMALLOC_MINALIGN <= 32)
		;			/* Original value is okay */
	else if (ARCH_KMALLOC_MINALIGN <= 64)
		pool_max[0] = 64;
	else if (ARCH_KMALLOC_MINALIGN <= 128)
		pool_max[0] = 0;	/* Don't use this pool */
	else
		BUILD_BUG();		/* We don't allow this */
}

/* SETUP primitives */

/**
 * hcd_buffer_create - initialize buffer pools
 * @hcd: the bus whose buffer pools are to be initialized
 * Context: !in_interrupt()
 *
 * Call this as part of initializing a host controller that uses the dma
 * memory allocators.  It initializes some pools of dma-coherent memory that
 * will be shared by all drivers using that controller.
 *
 * Call hcd_buffer_destroy() to clean up after using those pools.
 *
 * Return: 0 if successful. A negative errno value otherwise.
 */
int hcd_buffer_create(struct usb_hcd *hcd)
{
	char		name[16];
	int		i, size;

	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
	    (!hcd->self.controller->dma_mask &&
	     !(hcd->driver->flags & HCD_LOCAL_MEM)))
		return 0;

	for (i = 0; i < HCD_BUFFER_POOLS; i++) {
		size = pool_max[i];
		if (!size)
			continue;
		snprintf(name, sizeof(name), "buffer-%d", size);
		hcd->pool[i] = dma_pool_create(name, hcd->self.controller,
				size, size, 0);
		if (!hcd->pool[i]) {
			hcd_buffer_destroy(hcd);
			return -ENOMEM;
		}
	}
	return 0;
}


/**
 * hcd_buffer_destroy - deallocate buffer pools
 * @hcd: the bus whose buffer pools are to be destroyed
 * Context: !in_interrupt()
 *
 * This frees the buffer pools created by hcd_buffer_create().
 */
void hcd_buffer_destroy(struct usb_hcd *hcd)
{
	int i;

	if (!IS_ENABLED(CONFIG_HAS_DMA))
		return;

	for (i = 0; i < HCD_BUFFER_POOLS; i++) {
		struct dma_pool *pool = hcd->pool[i];

		if (pool) {
			dma_pool_destroy(pool);
			hcd->pool[i] = NULL;
		}
	}
}


/* sometimes alloc/free could use kmalloc with GFP_DMA, for
 * better sharing and to leverage mm/slab.c intelligence.
 */

void *hcd_buffer_alloc(
	struct usb_bus		*bus,
	size_t			size,
	gfp_t			mem_flags,
	dma_addr_t		*dma
)
{
	struct usb_hcd		*hcd = bus_to_hcd(bus);
	int			i;

	if (size == 0)
		return NULL;

	/* some USB hosts just use PIO */
	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
	    (!bus->controller->dma_mask &&
	     !(hcd->driver->flags & HCD_LOCAL_MEM))) {
		*dma = ~(dma_addr_t) 0;
		return kmalloc(size, mem_flags);
	}

	for (i = 0; i < HCD_BUFFER_POOLS; i++) {
		if (size <= pool_max[i])
			return dma_pool_alloc(hcd->pool[i], mem_flags, dma);
	}
	return dma_alloc_coherent(hcd->self.controller, size, dma, mem_flags);
}

void hcd_buffer_free(
	struct usb_bus		*bus,
	size_t			size,
	void			*addr,
	dma_addr_t		dma
)
{
	struct usb_hcd		*hcd = bus_to_hcd(bus);
	int			i;

	if (!addr)
		return;

	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
	    (!bus->controller->dma_mask &&
	     !(hcd->driver->flags & HCD_LOCAL_MEM))) {
		kfree(addr);
		return;
	}

	for (i = 0; i < HCD_BUFFER_POOLS; i++) {
		if (size <= pool_max[i]) {
			dma_pool_free(hcd->pool[i], addr, dma);
			return;
		}
	}
	dma_free_coherent(hcd->self.controller, size, addr, dma);
}
ption value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Simon Horman &lt;simon.horman@netronome.com&gt;</td><td class='right'>2017-01-30 16:19:02 +0100</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 16:42:09 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/kernel/time/posix-timers.c?id=040587af31228d82c52267f717c9fcdb65f36335'>040587af31228d82c52267f717c9fcdb65f36335</a> (<a href='/cgit.cgi/linux/net-next.git/patch/kernel/time/posix-timers.c?id=040587af31228d82c52267f717c9fcdb65f36335'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=040587af31228d82c52267f717c9fcdb65f36335'>b681c1594f967396fcf3ce80f17444183bb37900</a> /<a href='/cgit.cgi/linux/net-next.git/tree/kernel/time/posix-timers.c?id=040587af31228d82c52267f717c9fcdb65f36335'>kernel/time/posix-timers.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/kernel/time/posix-timers.c?id=0d29ed28da63dd893395c343c7e78b078de93ceb'>0d29ed28da63dd893395c343c7e78b078de93ceb</a> (<a href='/cgit.cgi/linux/net-next.git/diff/kernel/time/posix-timers.c?id=040587af31228d82c52267f717c9fcdb65f36335&amp;id2=0d29ed28da63dd893395c343c7e78b078de93ceb'>diff</a>)</td></tr></table>
<div class='commit-subject'>net/sched: cls_flower: Correct matching on ICMPv6 code</div><div class='commit-msg'>When matching on the ICMPv6 code ICMPV6_CODE rather than
ICMPV4_CODE attributes should be used.

This corrects what appears to be a typo.

Sample usage:

tc qdisc add dev eth0 ingress
tc filter add dev eth0 protocol ipv6 parent ffff: flower \
	indev eth0 ip_proto icmpv6 type 128 code 0 action drop

Without this change the code parameter above is effectively ignored.

Fixes: 7b684884fbfa ("net/sched: cls_flower: Support matching on ICMP type and code")
Signed-off-by: Simon Horman &lt;simon.horman@netronome.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=040587af31228d82c52267f717c9fcdb65f36335'>Diffstat</a> (limited to 'kernel/time/posix-timers.c')</div><table summary='diffstat' class='diffstat'>