/*
 * Freescale QUICC Engine USB Host Controller Driver
 *
 * Copyright (c) Freescale Semicondutor, Inc. 2006.
 *               Shlomi Gridish <gridish@freescale.com>
 *               Jerry Huang <Chang-Ming.Huang@freescale.com>
 * Copyright (c) Logic Product Development, Inc. 2007
 *               Peter Barada <peterb@logicpd.com>
 * Copyright (c) MontaVista Software, Inc. 2008.
 *               Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "fhci.h"

void fhci_dbg_isr(struct fhci_hcd *fhci, int usb_er)
{
	int i;

	if (usb_er == -1) {
		fhci->usb_irq_stat[12]++;
		return;
	}

	for (i = 0; i < 12; ++i) {
		if (usb_er & (1 << i))
			fhci->usb_irq_stat[i]++;
	}
}

static int fhci_dfs_regs_show(struct seq_file *s, void *v)
{
	struct fhci_hcd *fhci = s->private;
	struct qe_usb_ctlr __iomem *regs = fhci->regs;

	seq_printf(s,
		"mode: 0x%x\n" "addr: 0x%x\n"
		"command: 0x%x\n" "ep0: 0x%x\n"
		"event: 0x%x\n" "mask: 0x%x\n"
		"status: 0x%x\n" "SOF timer: %d\n"
		"frame number: %d\n"
		"lines status: 0x%x\n",
		in_8(&regs->usb_usmod), in_8(&regs->usb_usadr),
		in_8(&regs->usb_uscom), in_be16(&regs->usb_usep[0]),
		in_be16(&regs->usb_usber), in_be16(&regs->usb_usbmr),
		in_8(&regs->usb_usbs), in_be16(&regs->usb_ussft),
		in_be16(&regs->usb_usfrn),
		fhci_ioports_check_bus_state(fhci));

	return 0;
}

static int fhci_dfs_irq_stat_show(struct seq_file *s, void *v)
{
	struct fhci_hcd *fhci = s->private;
	int *usb_irq_stat = fhci->usb_irq_stat;

	seq_printf(s,
		"RXB: %d\n" "TXB: %d\n" "BSY: %d\n"
		"SOF: %d\n" "TXE0: %d\n" "TXE1: %d\n"
		"TXE2: %d\n" "TXE3: %d\n" "IDLE: %d\n"
		"RESET: %d\n" "SFT: %d\n" "MSF: %d\n"
		"IDLE_ONLY: %d\n",
		usb_irq_stat[0], usb_irq_stat[1], usb_irq_stat[2],
		usb_irq_stat[3], usb_irq_stat[4], usb_irq_stat[5],
		usb_irq_stat[6], usb_irq_stat[7], usb_irq_stat[8],
		usb_irq_stat[9], usb_irq_stat[10], usb_irq_stat[11],
		usb_irq_stat[12]);

	return 0;
}

static int fhci_dfs_regs_open(struct inode *inode, struct file *file)
{
	return single_open(file, fhci_dfs_regs_show, inode->i_private);
}

static int fhci_dfs_irq_stat_open(struct inode *inode, struct file *file)
{
	return single_open(file, fhci_dfs_irq_stat_show, inode->i_private);
}

static const struct file_operations fhci_dfs_regs_fops = {
	.open = fhci_dfs_regs_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static const struct file_operations fhci_dfs_irq_stat_fops = {
	.open = fhci_dfs_irq_stat_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

void fhci_dfs_create(struct fhci_hcd *fhci)
{
	struct device *dev = fhci_to_hcd(fhci)->self.controller;

	fhci->dfs_root = debugfs_create_dir(dev_name(dev), usb_debug_root);
	if (!fhci->dfs_root) {
		WARN_ON(1);
		return;
	}

	fhci->dfs_regs = debugfs_create_file("regs", S_IFREG | S_IRUGO,
		fhci->dfs_root, fhci, &fhci_dfs_regs_fops);

	fhci->dfs_irq_stat = debugfs_create_file("irq_stat",
		S_IFREG | S_IRUGO, fhci->dfs_root, fhci,
		&fhci_dfs_irq_stat_fops);

	WARN_ON(!fhci->dfs_regs || !fhci->dfs_irq_stat);
}

void fhci_dfs_destroy(struct fhci_hcd *fhci)
{
	if (!fhci->dfs_root)
		return;

	debugfs_remove(fhci->dfs_irq_stat);
	debugfs_remove(fhci->dfs_regs);
	debugfs_remove(fhci->dfs_root);
}
orm.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>Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;</td><td class='right'>2017-02-01 17:45:02 +0000</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-02-01 21:17:49 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>sound</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92&amp;id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff</a>)</td></tr></table>
<div class='commit-subject'>efi/fdt: Avoid FDT manipulation after ExitBootServices()</div><div class='commit-msg'>Some AArch64 UEFI implementations disable the MMU in ExitBootServices(),
after which unaligned accesses to RAM are no longer supported.

Commit:

  abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")

fixed an issue in the memory map handling of the stub FDT code, but
inadvertently created an issue with such firmware, by moving some
of the FDT manipulation to after the invocation of ExitBootServices().

Given that the stub's libfdt implementation uses the ordinary, accelerated
string functions, which rely on hardware handling of unaligned accesses,
manipulating the FDT with the MMU off may result in alignment faults.

So fix the situation by moving the update_fdt_memmap() call into the
callback function invoked by efi_exit_boot_services() right before it
calls the ExitBootServices() UEFI service (which is arguably a better
place for it anyway)

Note that disabling the MMU in ExitBootServices() is not compliant with
the UEFI spec, and carries great risk due to the fact that switching from
cached to uncached memory accesses halfway through compiler generated code
(i.e., involving a stack) can never be done in a way that is architecturally
safe.

Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")
Signed-off-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Tested-by: Riku Voipio &lt;riku.voipio@linaro.org&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Cc: mark.rutland@arm.com
Cc: linux-efi@vger.kernel.org
Cc: matt@codeblueprint.co.uk
Cc: leif.lindholm@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Diffstat</a> (limited to 'sound')</div><table summary='diffstat' class='diffstat'>