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Date: Thu, 1 Jul 2010 10:17:46 -0700
From: Randy Dunlap <randy.dunlap@...cle.com>
To: Zach Pfeffer <zpfeffer@...eaurora.org>
Cc: mel@....ul.ie, andi@...stfloor.org, dwalker@...eaurora.org,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-omap@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager
On Tue, 29 Jun 2010 22:55:50 -0700 Zach Pfeffer wrote:
> arch/arm/mm/vcm.c | 1901 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/vcm.h | 701 +++++++++++++++++
> include/linux/vcm_types.h | 318 ++++++++
> 3 files changed, 2920 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mm/vcm.c
> create mode 100644 include/linux/vcm.h
> create mode 100644 include/linux/vcm_types.h
> diff --git a/include/linux/vcm.h b/include/linux/vcm.h
> new file mode 100644
> index 0000000..d2a1cd1
> --- /dev/null
> +++ b/include/linux/vcm.h
> @@ -0,0 +1,701 @@
> +/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
> + *
> + * 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.
> + * * Neither the name of Code Aurora Forum, Inc. nor the names of its
> + * contributors may be used to endorse or promote products derived
> + * from this software without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
> + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
> + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
> + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
> + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
> + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
> + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + *
> + */
What license (name/type) is this?
> +
> +#ifndef _VCM_H_
> +#define _VCM_H_
> +
> +/* All undefined types must be defined using platform specific headers */
> +
> +#include <linux/vcm_types.h>
> +
> +/*
> + * Creating, freeing and managing VCMs.
> + *
> + * A VCM region is a virtual space that can be reserved from and
> + * associated with one or more devices. At creation the user can
> + * specify an offset to start addresses and a length of the entire VCM
> + * region. Reservations out of a VCM region are always contiguous.
> + */
> +
> +/**
> + * vcm_create() - Create a VCM region
> + * @start_addr The starting address of the VCM region.
* @start_addr: text
* @len: text
I.e., need a colon (':') after each param name. (in multiple places)
> + * @len The len of the VCM region. This must be at least
> + * vcm_get_min_page_size() bytes.
> + *
> + * A VCM typically abstracts a page table.
> + *
> + * All functions in this API are passed and return opaque things
> + * because the underlying implementations will vary. The goal
> + * is really graph management. vcm_create() creates the "device end"
> + * of an edge in the mapping graph.
> + *
> + * The return value is non-zero if a VCM has successfully been
> + * created. It will return zero if a VCM region cannot be created or
> + * len is invalid.
> + */
> +struct vcm *vcm_create(size_t start_addr, size_t len);
> +/**
> + * vcm_get_physmem_from_res() - Return a reservation's physmem_id
> + * @ res_id An existing reservation of interest.
* @res_id: <text>
No space between @ and res_id.
> + *
> + * The return value will be non-zero on success, otherwise it will be:
> + * -EINVAL res is invalid
> + * -ENOMEM res is unbacked
> + */
> +struct physmem *vcm_get_physmem_from_res(struct res *res_id);
> diff --git a/include/linux/vcm_types.h b/include/linux/vcm_types.h
> new file mode 100644
> index 0000000..2cc4770
> --- /dev/null
> +++ b/include/linux/vcm_types.h
> @@ -0,0 +1,318 @@
> +/**
> + * enum memtarget_t - A logical location in a VCM.
> + *
> + * VCM_START Indicates the start of a VCM_REGION.
This is not quite kernel-doc notation (as indicated by the beginning /**).
Please see Documentation/kernel-doc-nano-HOWTO.txt for details, or ask me
if you need help with it.
> + */
> +enum memtarget_t {
> + VCM_START
> +};
> +
> +
> +/**
> + * enum memtype_t - A logical location in a VCM.
not quite kernel-doc notation...
> + *
> + * VCM_MEMTYPE_0 Generic memory type 0
> + * VCM_MEMTYPE_1 Generic memory type 1
> + * VCM_MEMTYPE_2 Generic memory type 2
> + *
> + * A memtype encapsulates a platform specific memory arrangement. The
> + * memtype needn't refer to a single type of memory, it can refer to a
> + * set of memories that can back a reservation.
> + *
> + */
> +enum memtype_t {
> + VCM_INVALID,
> + VCM_MEMTYPE_0,
> + VCM_MEMTYPE_1,
> + VCM_MEMTYPE_2,
> +};
> +
> +
> +/**
> + * vcm_handler - The signature of the fault hook.
> + * @dev_id The device id of the faulting device.
> + * @data The generic data pointer.
> + * @fault_data System specific common fault data.
ditto.
> + *
> + * The handler should return 0 for success. This indicates that the
> + * fault was handled. A non-zero return value is an error and will be
> + * propagated up the stack.
> + */
> +typedef int (*vcm_handler)(size_t dev_id, void *data, void *fault_data);
> +
> +
> +enum vcm_type {
> + VCM_DEVICE,
> + VCM_EXT_KERNEL,
> + VCM_EXT_USER,
> + VCM_ONE_TO_ONE,
> +};
> +
> +
> +/**
> + * vcm - A Virtually Contiguous Memory region.
* struct vcm - ...
and add colon after each struct @member:
> + * @start_addr The starting address of the VCM region.
> + * @len The len of the VCM region. This must be at least
> + * vcm_min() bytes.
and missing lots of struct members here.
If some of them are private, you can use:
/* private: */
...
/* public: */
comments in the struct below and then don't add the private ones to the
kernel-doc notation above.
> + */
> +struct vcm {
> + enum vcm_type type;
> +
> + size_t start_addr;
> + size_t len;
> +
> + size_t dev_id; /* opaque device control */
> +
> + /* allocator dependent */
> + struct gen_pool *pool;
> +
> + struct list_head res_head;
> +
> + /* this will be a very short list */
> + struct list_head assoc_head;
> +};
> +
> +/**
> + * avcm - A VCM to device association
not quite kernel-doc notation.
> + * @vcm The VCM region of interest.
> + * @dev_id The device to associate the VCM with.
> + * @attr See 'Association Attributes'.
> + */
> +struct avcm {
> + struct vcm *vcm_id;
> + size_t dev_id;
> + uint32_t attr;
> +
> + struct list_head assoc_elm;
> +
> + int is_active; /* is this particular association active */
> +};
> +
> +/**
> + * bound - A boundary to reserve from in a VCM region.
ditto.
> + * @vcm The VCM that needs a bound.
> + * @len The len of the bound.
> + */
> +struct bound {
> + struct vcm *vcm_id;
> + size_t len;
> +};
> +
> +
> +/**
> + * physmem - A physical memory allocation.
ditto.
> + * @memtype The memory type of the VCM region.
> + * @len The len of the physical memory allocation.
> + * @attr See 'Physical Allocation Attributes'.
> + *
> + */
> +
> +struct physmem {
> + enum memtype_t memtype;
> + size_t len;
> + uint32_t attr;
> +
> + struct phys_chunk alloc_head;
> +
> + /* if the physmem is cont then use the built in VCM */
> + int is_cont;
> + struct res *res;
> +};
> +
> +/**
> + * res - A reservation in a VCM region.
ditto.
> + * @vcm The VCM region to reserve from.
> + * @len The length of the reservation. Must be at least vcm_min()
> + * bytes.
> + * @attr See 'Reservation Attributes'.
> + */
> +struct res {
> + struct vcm *vcm_id;
> + struct physmem *physmem_id;
> + size_t len;
> + uint32_t attr;
> +
> + /* allocator dependent */
> + size_t alignment_req;
> + size_t aligned_len;
> + unsigned long ptr;
> + size_t aligned_ptr;
> +
> + struct list_head res_elm;
> +
> +
> + /* type VCM_EXT_KERNEL */
> + struct vm_struct *vm_area;
> + int mapped;
> +};
> +
> +extern int chunk_sizes[NUM_CHUNK_SIZES];
> +
> +#endif /* VCM_TYPES_H */
> --
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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