Message-ID: <49ac8217-1e89-bb4a-8592-9d57039f792c@acm.org>
Date:   Fri, 27 Oct 2017 13:32:28 -0500
From:   Corey Minyard <minyard@....org>
To:     Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        catalin.marinas@....com, will.deacon@....com, robh+dt@...nel.org,
        frowand.list@...il.com, bhelgaas@...gle.com, rafael@...nel.org,
        arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
        lorenzo.pieralisi@....com
Cc:     mark.rutland@....com, brian.starkey@....com, olof@...om.net,
        benh@...nel.crashing.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linuxarm@...wei.com,
        linux-pci@...r.kernel.org, john.garry@...wei.com,
        xuwei5@...ilicon.com, "zhichang.yuan" <yuanzhichang@...ilicon.com>
Subject: Re: [PATCH v10 1/9] LIB: Introduce a generic PIO mapping method

On 10/27/2017 11:11 AM, Gabriele Paoloni wrote:
> From: "zhichang.yuan" <yuanzhichang@...ilicon.com>
>
> In commit 41f8bba7f555 ("of/pci: Add pci_register_io_range() and
> pci_pio_to_address()"), a new I/O space management was supported. With
> that driver, the I/O ranges configured for PCI/PCIE hosts on some
> architectures can be mapped to logical PIO, converted easily between
> CPU address and the corresponding logicial PIO. Based on this, PCI
> I/O devices can be accessed in a memory read/write way through the
> unified in/out accessors.
>
> But on some archs/platforms, there are bus hosts which access I/O
> peripherals with host-local I/O port addresses rather than memory
> addresses after memory-mapped.
> To support those devices, a more generic I/O mapping method is introduced
> here. Through this patch, both the CPU addresses and the host-local port
> can be mapped into the logical PIO space with different logical/fake PIOs.
> After this, all the I/O accesses to either PCI MMIO devices or host-local
> I/O peripherals can be unified into the existing I/O accessors defined in
> asm-generic/io.h and be redirected to the right device-specific hooks
> based on the input logical PIO.
>
> Signed-off-by: zhichang.yuan <yuanzhichang@...ilicon.com>
> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@...wei.com>
> ---
>   include/asm-generic/io.h  |  26 +++++
>   include/linux/logic_pio.h | 118 +++++++++++++++++++
>   lib/Kconfig               |  26 +++++
>   lib/Makefile              |   2 +
>   lib/logic_pio.c           | 286 ++++++++++++++++++++++++++++++++++++++++++++++
>   5 files changed, 458 insertions(+)
>   create mode 100644 include/linux/logic_pio.h
>   create mode 100644 lib/logic_pio.c
>
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index 7ef015e..334e5db 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -351,6 +351,8 @@ static inline void writesq(volatile void __iomem *addr, const void *buffer,
>   #define IO_SPACE_LIMIT 0xffff
>   #endif
>   
> +#include <linux/logic_pio.h>

This whole thing would be a lot simpler if you had:

#ifdef CONFIG_INDIRECT_PIO
#define inb logic_inb
#define outb logic outb
.
.
#endif /* CONFIG_INDIRECT_PIO */

and let the "ifndef XXX" below handle not enabling the standard code.
You could even put that in logic_pio.h to avoid polluting io.h.

You might have to add "#ifndef inb", etc. above, but I still think it would
be better.

I'm not sure if this wouldn't be better done in arm64/include/asm/io.h, 
though.
A specific machine may want to only do this in ranges, for instance.

-corey

> +
>   /*
>    * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
>    * implemented on hardware that needs an additional delay for I/O accesses to
> @@ -358,51 +360,75 @@ static inline void writesq(volatile void __iomem *addr, const void *buffer,
>    */
>   
>   #ifndef inb
> +#ifdef CONFIG_INDIRECT_PIO
> +#define inb logic_inb
> +#else
>   #define inb inb
>   static inline u8 inb(unsigned long addr)
>   {
>   	return readb(PCI_IOBASE + addr);
>   }
> +#endif /* CONFIG_INDIRECT_PIO */
>   #endif
>   
>   #ifndef inw
> +#ifdef CONFIG_INDIRECT_PIO
> +#define inw logic_inw
> +#else
>   #define inw inw
>   static inline u16 inw(unsigned long addr)
>   {
>   	return readw(PCI_IOBASE + addr);
>   }
> +#endif /* CONFIG_INDIRECT_PIO */
>   #endif
>   
>   #ifndef inl
> +#ifdef CONFIG_INDIRECT_PIO
> +#define inl logic_inl
> +#else
>   #define inl inl
>   static inline u32 inl(unsigned long addr)
>   {
>   	return readl(PCI_IOBASE + addr);
>   }
> +#endif /* CONFIG_INDIRECT_PIO */
>   #endif
>   
>   #ifndef outb
> +#ifdef CONFIG_INDIRECT_PIO
> +#define outb logic_outb
> +#else
>   #define outb outb
>   static inline void outb(u8 value, unsigned long addr)
>   {
>   	writeb(value, PCI_IOBASE + addr);
>   }
> +#endif /* CONFIG_INDIRECT_PIO */
>   #endif
>   
>   #ifndef outw
> +#ifdef CONFIG_INDIRECT_PIO
> +#define outw logic_outw
> +#else
>   #define outw outw
>   static inline void outw(u16 value, unsigned long addr)
>   {
>   	writew(value, PCI_IOBASE + addr);
>   }
> +#endif /* CONFIG_INDIRECT_PIO */
>   #endif
>   
>   #ifndef outl
> +#ifdef CONFIG_INDIRECT_PIO
> +#define outl logic_outl
> +#else
>   #define outl outl
>   static inline void outl(u32 value, unsigned long addr)
>   {
>   	writel(value, PCI_IOBASE + addr);
>   }
> +#endif /* CONFIG_INDIRECT_PIO */
>   #endif
>   
>   #ifndef inb_p
> diff --git a/include/linux/logic_pio.h b/include/linux/logic_pio.h
> new file mode 100644
> index 0000000..f0a6f15
> --- /dev/null
> +++ b/include/linux/logic_pio.h
> @@ -0,0 +1,118 @@
> +/*
> + * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved.
> + * Author: Gabriele Paoloni <gabriele.paoloni@...wei.com>
> + * Author: Zhichang Yuan <yuanzhichang@...ilicon.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef __LINUX_LOGIC_PIO_H
> +#define __LINUX_LOGIC_PIO_H
> +
> +#ifdef __KERNEL__
> +
> +#include <linux/fwnode.h>
> +
> +#define PIO_INDIRECT		0x01UL /* indirect IO flag */
> +#define PIO_CPU_MMIO		0x00UL /* memory mapped io flag */
> +
> +struct logic_pio_hwaddr {
> +	struct list_head list;
> +	struct fwnode_handle *fwnode;
> +	resource_size_t hw_start;
> +	resource_size_t io_start;
> +	resource_size_t size; /* range size populated */
> +	unsigned long flags;
> +
> +	void *devpara;	/* private parameter of the host device */
> +	struct hostio_ops *ops;	/* ops operating on this node */
> +};
> +
> +struct hostio_ops {
> +	u32 (*pfin)(void *devobj, unsigned long ptaddr,	size_t dlen);
> +	void (*pfout)(void *devobj, unsigned long ptaddr, u32 outval,
> +			size_t dlen);
> +	u32 (*pfins)(void *devobj, unsigned long ptaddr, void *inbuf,
> +			size_t dlen, unsigned int count);
> +	void (*pfouts)(void *devobj, unsigned long ptaddr,
> +			const void *outbuf, size_t dlen, unsigned int count);
> +};
> +
> +#ifdef CONFIG_INDIRECT_PIO
> +u8 logic_inb(unsigned long addr);
> +void logic_outb(u8 value, unsigned long addr);
> +void logic_outw(u16 value, unsigned long addr);
> +void logic_outl(u32 value, unsigned long addr);
> +u16 logic_inw(unsigned long addr);
> +u32 logic_inl(unsigned long addr);
> +void logic_outb(u8 value, unsigned long addr);
> +void logic_outw(u16 value, unsigned long addr);
> +void logic_outl(u32 value, unsigned long addr);
> +void logic_insb(unsigned long addr, void *buffer, unsigned int count);
> +void logic_insl(unsigned long addr, void *buffer, unsigned int count);
> +void logic_insw(unsigned long addr, void *buffer, unsigned int count);
> +void logic_outsb(unsigned long addr, const void *buffer, unsigned int count);
> +void logic_outsw(unsigned long addr, const void *buffer, unsigned int count);
> +void logic_outsl(unsigned long addr, const void *buffer, unsigned int count);
> +
> +#define insb logic_insb
> +#define insw logic_insw
> +#define insl logic_insl
> +#define outsb logic_outsb
> +#define outsw logic_outsw
> +#define outsl logic_outsl
> +
> +/*
> + * Below we reserve 0x4000 bytes for Indirect IO as so far this library is only
> + * used by Hisilicon LPC Host. If needed in future we may reserve a wider IO
> + * area by redefining the macro below.
> + */
> +#define PIO_INDIRECT_SIZE 0x4000
> +#define MMIO_UPPER_LIMIT (IO_SPACE_LIMIT - PIO_INDIRECT_SIZE)
> +#else
> +#define MMIO_UPPER_LIMIT IO_SPACE_LIMIT
> +#endif
> +
> +#ifdef CONFIG_LOGIC_PIO
> +struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode);
> +
> +unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,
> +			resource_size_t hw_addr, resource_size_t size);
> +
> +int logic_pio_register_range(struct logic_pio_hwaddr *newrange);
> +#else
> +static inline struct logic_pio_hwaddr
> +*find_io_range_by_fwnode(struct fwnode_handle *fwnode)
> +{
> +	return NULL;
> +}
> +
> +static inline unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,
> +			resource_size_t hw_addr, resource_size_t size);
> +{
> +	return -1;
> +}
> +
> +static inline struct logic_pio_hwaddr
> +*logic_pio_register_range(struct logic_pio_hwaddr *newrange);
> +{
> +	return NULL;
> +}
> +#endif
> +
> +extern resource_size_t logic_pio_to_hwaddr(unsigned long pio);
> +
> +extern unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr);
> +
> +#endif /* __KERNEL__ */
> +#endif /* __LINUX_LOGIC_PIO_H */
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 6762529..d7443a6 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -59,6 +59,32 @@ config ARCH_USE_CMPXCHG_LOCKREF
>   config ARCH_HAS_FAST_MULTIPLIER
>   	bool
>   
> +config LOGIC_PIO
> +	bool "Generic logical I/O management"
> +	def_bool y if PCI && !X86 && !IA64 && !POWERPC
> +	help
> +	  For some architectures, there are no IO space. To support the
> +	  accesses to legacy I/O devices on those architectures, kernel
> +	  implemented the memory mapped I/O mechanism based on bridge bus
> +	  supports. But for some buses which do not support MMIO, the
> +	  peripherals there should be accessed with device-specific way.
> +	  To abstract those different I/O accesses into unified I/O accessors,
> +	  this option provide a generic I/O space management way after mapping
> +	  the device I/O to system logical/fake I/O and help to hide all the
> +	  hardware detail.
> +
> +config INDIRECT_PIO
> +	bool "Access I/O in non-MMIO mode" if LOGIC_PIO
> +	help
> +	  On some platforms where no separate I/O space exist, there are I/O
> +	  hosts which can not be accessed in MMIO mode. Based on LOGIC_PIO
> +	  mechanism, the host-local I/O resource can be mapped into system
> +	  logic PIO space shared with MMIO hosts, such as PCI/PCIE, then system
> +	  can access the I/O devices with the mapped logic PIO through I/O
> +	  accessors.
> +	  This way has a little I/O performance cost. Please make sure your
> +	  devices really need this configure item enabled.
> +

If this is always available on the hisilicon chips, I think you would 
want to just always
enable this on those chips.

-corey

>   config CRC_CCITT
>   	tristate "CRC-CCITT functions"
>   	help
> diff --git a/lib/Makefile b/lib/Makefile
> index 40c1837..e0246ad 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -77,6 +77,8 @@ obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
>   obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
>   obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
>   
> +obj-$(CONFIG_LOGIC_PIO) += logic_pio.o
> +
>   obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
>   
>   obj-$(CONFIG_BTREE) += btree.o
> diff --git a/lib/logic_pio.c b/lib/logic_pio.c
> new file mode 100644
> index 0000000..f8427cb
> --- /dev/null
> +++ b/lib/logic_pio.c
> @@ -0,0 +1,286 @@
> +/*
> + * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved.
> + * Author: Gabriele Paoloni <gabriele.paoloni@...wei.com>
> + * Author: Zhichang Yuan <yuanzhichang@...ilicon.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/of.h>
> +#include <linux/io.h>
> +#include <linux/logic_pio.h>
> +#include <linux/mm.h>
> +#include <linux/rculist.h>
> +#include <linux/sizes.h>
> +#include <linux/slab.h>
> +
> +/* The unique hardware address list. */
> +static LIST_HEAD(io_range_list);
> +static DEFINE_MUTEX(io_range_mutex);
> +
> +/*
> + * register a new io range node in the io range list.
> + *
> + * @newrange: pointer to the io range to be registered.
> + *
> + * returns 0 on success, the error code in case of failure
> + */
> +int logic_pio_register_range(struct logic_pio_hwaddr *new_range)
> +{
> +	struct logic_pio_hwaddr *range;
> +	int ret = 0;
> +	resource_size_t start = new_range->hw_start;
> +	resource_size_t end = new_range->hw_start + new_range->size;
> +	resource_size_t allocated_mmio_size = 0;
> +	resource_size_t allocated_iio_size = MMIO_UPPER_LIMIT;
> +
> +	if (!new_range || !new_range->fwnode || !new_range->size)
> +		return -EINVAL;
> +
> +	mutex_lock(&io_range_mutex);
> +	list_for_each_entry_rcu(range, &io_range_list, list) {
> +
> +		if (range->fwnode == new_range->fwnode) {
> +			/* range already there */
> +			ret = -EFAULT;
> +			goto end_register;
> +		}
> +		if (range->flags == PIO_CPU_MMIO &&
> +				new_range->flags == PIO_CPU_MMIO) {
> +			/* for MMIO ranges we need to check for overlap */
> +			if (start >= range->hw_start + range->size ||
> +				end < range->hw_start)
> +				allocated_mmio_size += range->size;
> +			else {
> +				ret = -EFAULT;
> +				goto end_register;
> +			}
> +		} else if (range->flags == PIO_INDIRECT &&
> +				new_range->flags == PIO_INDIRECT) {
> +			allocated_iio_size += range->size;
> +		}
> +	}
> +
> +	/* range not registered yet, check for available space */
> +	if (new_range->flags == PIO_CPU_MMIO) {
> +
> +		if (allocated_mmio_size + new_range->size - 1 >
> +			MMIO_UPPER_LIMIT) {
> +			/* if it's too big check if 64K space can be reserved */
> +			if (allocated_mmio_size + SZ_64K - 1 >
> +			MMIO_UPPER_LIMIT) {
> +				ret = -E2BIG;
> +				goto end_register;
> +			}
> +			new_range->size = SZ_64K;
> +			pr_warn("Requested IO range too big, new size set to 64K\n");
> +		}
> +
> +		new_range->io_start = allocated_mmio_size;
> +
> +	} else if (new_range->flags == PIO_INDIRECT) {
> +
> +		if (allocated_iio_size + new_range->size - 1 >
> +		IO_SPACE_LIMIT) {
> +			ret = -E2BIG;
> +			goto end_register;
> +		}
> +		new_range->io_start = allocated_iio_size;
> +
> +	} else {
> +		/* invalid flag */
> +		ret = -EINVAL;
> +		goto end_register;
> +	}
> +
> +	list_add_tail_rcu(&new_range->list, &io_range_list);
> +
> +end_register:
> +	mutex_unlock(&io_range_mutex);
> +	return ret;
> +}
> +
> +/*
> + * traverse the io_range_list to find the registered node whose device node
> + * and/or physical IO address match to.
> + */
> +struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode)
> +{
> +	struct logic_pio_hwaddr *range;
> +
> +	list_for_each_entry_rcu(range, &io_range_list, list) {
> +		if (range->fwnode == fwnode)
> +			return range;
> +	}
> +	return NULL;
> +}
> +
> +/* return a registered range given an input PIO token */
> +static struct logic_pio_hwaddr *find_io_range(unsigned long pio)
> +{
> +	struct logic_pio_hwaddr *range;
> +
> +	list_for_each_entry_rcu(range, &io_range_list, list) {
> +		if (pio >= range->io_start &&
> +				pio < range->io_start + range->size)
> +			return range;
> +	}
> +	pr_err("PIO entry token invalid\n");
> +	return NULL;
> +}
> +
> +/*
> + * Translate the input logical pio to the corresponding hardware address.
> + * The input pio should be unique in the whole logical PIO space.
> + */
> +resource_size_t logic_pio_to_hwaddr(unsigned long pio)
> +{
> +	struct logic_pio_hwaddr *range;
> +	resource_size_t hwaddr = -1;
> +
> +	range = find_io_range(pio);
> +	if (range)
> +		hwaddr = range->hw_start + pio - range->io_start;
> +
> +	return hwaddr;
> +}
> +
> +/*
> + * This function is generic for translating a hardware address to logical PIO.
> + * @hw_addr: the hardware address of host, can be CPU address or host-local
> + *		address;
> + */
> +unsigned long
> +logic_pio_trans_hwaddr(struct fwnode_handle *fwnode, resource_size_t addr,
> +		       resource_size_t size)
> +{
> +	struct logic_pio_hwaddr *range;
> +
> +	range = find_io_range_by_fwnode(fwnode);
> +	if (!range || range->flags == PIO_CPU_MMIO) {
> +		pr_err("range not found or invalid\n");
> +		return -1;
> +	}
> +	if (range->size < size) {
> +		pr_err("resource size 0x%llx cannot fit in IO range size 0x%llx\n",
> +		       size, range->size);
> +		return -1;
> +	}
> +	return addr - range->hw_start + range->io_start;
> +}
> +
> +unsigned long
> +logic_pio_trans_cpuaddr(resource_size_t addr)
> +{
> +	struct logic_pio_hwaddr *range;
> +
> +	list_for_each_entry_rcu(range, &io_range_list, list) {
> +		if (range->flags != PIO_CPU_MMIO)
> +			continue;
> +		if (addr >= range->hw_start &&
> +			addr < range->hw_start + range->size)
> +			return addr - range->hw_start +
> +				range->io_start;
> +	}
> +	pr_err("addr not registered in io_range_list\n");
> +	return -1;
> +}
> +
> +#if defined(CONFIG_INDIRECT_PIO) && defined(PCI_IOBASE)
> +#define BUILD_LOGIC_IO(bw, type)					\
> +type logic_in##bw(unsigned long addr)					\
> +{									\
> +	type ret = -1;							\
> +									\
> +	if (addr < MMIO_UPPER_LIMIT) {					\
> +		ret = read##bw(PCI_IOBASE + addr);			\
> +	} else {							\
> +		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
> +									\
> +		if (entry && entry->ops)				\
> +			ret = entry->ops->pfin(entry->devpara,		\
> +					addr, sizeof(type));		\
> +		else							\
> +			WARN_ON_ONCE(1);				\
> +	}								\
> +	return ret;							\
> +}									\
> +									\
> +void logic_out##bw(type value, unsigned long addr)			\
> +{									\
> +	if (addr < MMIO_UPPER_LIMIT) {					\
> +		write##bw(value, PCI_IOBASE + addr);			\
> +	} else {							\
> +		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
> +									\
> +		if (entry && entry->ops)				\
> +			entry->ops->pfout(entry->devpara,		\
> +					addr, value, sizeof(type));	\
> +		else							\
> +			WARN_ON_ONCE(1);				\
> +	}								\
> +}									\
> +									\
> +void logic_ins##bw(unsigned long addr, void *buffer, unsigned int count)\
> +{									\
> +	if (addr < MMIO_UPPER_LIMIT) {					\
> +		reads##bw(PCI_IOBASE + addr, buffer, count);		\
> +	} else {							\
> +		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
> +									\
> +		if (entry && entry->ops)				\
> +			entry->ops->pfins(entry->devpara,		\
> +				addr, buffer, sizeof(type), count);	\
> +		else							\
> +			WARN_ON_ONCE(1);				\
> +	}								\
> +									\
> +}									\
> +									\
> +void logic_outs##bw(unsigned long addr, const void *buffer,		\
> +		    unsigned int count)					\
> +{									\
> +	if (addr < MMIO_UPPER_LIMIT)					\
> +		writes##bw(PCI_IOBASE + addr, buffer, count);		\
> +	else {								\
> +		struct logic_pio_hwaddr *entry = find_io_range(addr);	\
> +									\
> +		if (entry && entry->ops)				\
> +			entry->ops->pfouts(entry->devpara,		\
> +				addr, buffer, sizeof(type), count);	\
> +		else							\
> +			WARN_ON_ONCE(1);				\
> +	}								\
> +}
> +
> +BUILD_LOGIC_IO(b, u8)
> +
> +EXPORT_SYMBOL(logic_inb);
> +EXPORT_SYMBOL(logic_outb);
> +EXPORT_SYMBOL(logic_insb);
> +EXPORT_SYMBOL(logic_outsb);
> +
> +BUILD_LOGIC_IO(w, u16)
> +
> +EXPORT_SYMBOL(logic_inw);
> +EXPORT_SYMBOL(logic_outw);
> +EXPORT_SYMBOL(logic_insw);
> +EXPORT_SYMBOL(logic_outsw);
> +
> +BUILD_LOGIC_IO(l, u32)
> +
> +EXPORT_SYMBOL(logic_inl);
> +EXPORT_SYMBOL(logic_outl);
> +EXPORT_SYMBOL(logic_insl);
> +EXPORT_SYMBOL(logic_outsl);
> +#endif /* CONFIG_INDIRECT_PIO && PCI_IOBASE */

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