> -----Original Message-----
> From: Sin, David
> Sent: Saturday, July 24, 2010 4:52 AM
> To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx;
> Tony Lindgren; Russell King
> Cc: Kanigeri, Hari; Ohad Ben-Cohen; Hiremath, Vaibhav; Shilimkar, Santosh;
> Molnar, Lajos; Sin, David; Ramachandra, Ravikiran
> Subject: [RFC 2/8] TILER-DMM: Container manager interface and utility
> definitons
>
> From: Lajos Molnar <molnar@xxxxxx>
>
> This patch defined the TILER Container Manager (TCM) interface and
> provides utility methods for implementing a TCM.
>
> Signed-off-by: Lajos Molnar <molnar@xxxxxx>
> Signed-off-by: David Sin <davidsin@xxxxxx>
> Signed-off-by: Ravi Ramachandra <r.ramachandra@xxxxxx>
> ---
> drivers/media/video/tiler/tcm.h | 209
> +++++++++++++++++++++++++++++
> drivers/media/video/tiler/tcm/tcm-utils.h | 54 ++++++++
> 2 files changed, 263 insertions(+), 0 deletions(-)
> create mode 100644 drivers/media/video/tiler/tcm.h
> create mode 100644 drivers/media/video/tiler/tcm/tcm-utils.h
>
> diff --git a/drivers/media/video/tiler/tcm.h
> b/drivers/media/video/tiler/tcm.h
> new file mode 100644
> index 0000000..52a022a
> --- /dev/null
> +++ b/drivers/media/video/tiler/tcm.h
> @@ -0,0 +1,209 @@
> +/*
> + * tcm.h
> + *
> + * TILER container manager specification and support functions for TI
> + * TILER driver.
> + *
> + * Author: Lajos Molnar <molnar@xxxxxx>
> + *
> + * Copyright (C) 2009-2010 Texas Instruments, Inc.
> + *
> + * This package 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 PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
> + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
> + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
> + */
> +
> +#ifndef TCM_H
> +#define TCM_H
> +
> +struct tcm;
> +
> +/* point */
> +struct tcm_pt {
> + u16 x;
> + u16 y;
> +};
> +
> +/* 2d area */
> +struct tcm_area {
> + struct tcm *tcm; /* parent */
> + struct tcm_pt p0;
> + struct tcm_pt p1;
> +};
> +
> +struct tcm {
> + u16 width, height; /* container dimensions */
> +
> + /* 'pvt' structure shall contain any tcm details (attr) along with
> + linked list of allocated areas and mutex for mutually exclusive
> access
> + to the list. It may also contain copies of width and height to
> notice
> + any changes to the publicly available width and height fields. */
Commenting style ...
> + void *pvt;
> +
> + /* function table */
> + s32 (*reserve_2d)(struct tcm *tcm, u16 height, u16 width, u8 align,
> + struct tcm_area *area);
> + s32 (*free) (struct tcm *tcm, struct tcm_area *area);
> + void (*deinit) (struct tcm *tcm);
> +};
> +
> +/*=======================================================================
> ======
> + BASIC TILER CONTAINER MANAGER INTERFACE
> +=========================================================================
> ====*/
Commenting style.
> +
> +/*
> + * NOTE:
> + *
> + * Since some basic parameter checking is done outside the TCM
> algorithms,
> + * TCM implementation do NOT have to check the following:
> + *
> + * area pointer is NULL
> + * width and height fits within container
> + * number of pages is more than the size of the container
> + *
> + */
> +
> +/**
> + * Template for <ALGO_NAME>_tcm_init method. Define as:
> + * TCM_INIT(<ALGO_NAME>_tcm_init)
> + *
> + * Allocates and initializes a tiler container manager.
> + *
> + * @param width Width of container
> + * @param height Height of container
> + * @param attr Container manager specific configuration
> + * arguments. Please describe these in
> + * your header file.
> + *
> + * @return Pointer to the allocated and initialized container
> + * manager. NULL on failure. DO NOT leak any memory on
> + * failure!
> + */
> +#define TCM_INIT(name, attr_t) \
> +struct tcm *name(u16 width, u16 height, typeof(attr_t) *attr);
> +
> +/**
> + * Deinitialize tiler container manager.
> + *
> + * @param tcm Pointer to container manager.
> + *
> + * @return 0 on success, non-0 error value on error. The call
> + * should free as much memory as possible and meaningful
> + * even on failure. Some error codes: -ENODEV: invalid
> + * manager.
> + */
> +static inline void tcm_deinit(struct tcm *tcm)
> +{
> + if (tcm)
> + tcm->deinit(tcm);
> +}
> +
> +/**
> + * Reserves a 2D area in the container.
> + *
> + * @param tcm Pointer to container manager.
> + * @param height Height(in pages) of area to be reserved.
> + * @param width Width(in pages) of area to be reserved.
> + * @param align Alignment requirement for top-left corner of area.
> Not
> + * all values may be supported by the container manager,
> + * but it must support 0 (1), 32 and 64.
> + * 0 value is equivalent to 1.
> + * @param area Pointer to where the reserved area should be
> stored.
> + *
> + * @return 0 on success. Non-0 error code on failure. Also,
> + * the tcm field of the area will be set to NULL on
> + * failure. Some error codes: -ENODEV: invalid manager,
> + * -EINVAL: invalid area, -ENOMEM: not enough space for
> + * allocation.
> + */
> +static inline s32 tcm_reserve_2d(struct tcm *tcm, u16 width, u16 height,
> + u16 align, struct tcm_area *area)
> +{
> + /* perform rudimentary error checking */
> + s32 res = (tcm == NULL ? -ENODEV :
> + (area == NULL || width == 0 || height == 0 ||
> + /* align must be a 2 power */
> + align & (align - 1)) ? -EINVAL :
> + (height > tcm->height || width > tcm->width) ? -ENOMEM :
> + tcm->reserve_2d(tcm, height, width, align, area));
> +
> + if (area)
> + area->tcm = res ? NULL : tcm;
> +
> + return res;
> +}
> +
> +/**
> + * Free a previously reserved area from the container.
> + *
> + * @param area Pointer to area reserved by a prior call to
> tcm_reserve_2d call,
> + * whether it was successful or not. (Note: all fields of
> + * the structure must match.)
> + *
> + * @return 0 on success. Non-0 error code on failure. Also, the tcm
> + * field of the area is set to NULL on success to avoid subsequent
> + * freeing. This call will succeed even if supplying
> + * the area from a failed reserved call.
> + */
> +static inline s32 tcm_free(struct tcm_area *area)
> +{
> + s32 res = 0; /* free succeeds by default */
> +
> + if (area && area->tcm) {
> + res = area->tcm->free(area->tcm, area);
> + if (res == 0)
> + area->tcm = NULL;
> + }
> +
> + return res;
> +}
> +
> +/*=======================================================================
> ======
> + HELPER FUNCTION FOR ANY TILER CONTAINER MANAGER
> +=========================================================================
> ====*/
> +
> +/* Verify if a tcm area is logically valid */
> +static inline bool tcm_area_is_valid(struct tcm_area *area)
> +{
> + return area && area->tcm &&
> + /* coordinate bounds */
> + area->p1.x < area->tcm->width &&
> + area->p1.y < area->tcm->height &&
> + area->p0.y <= area->p1.y &&
> + area->p0.x <= area->p1.x;
> +}
> +
> +/* see if a coordinate is within an area */
> +static inline bool __tcm_is_in(struct tcm_pt *p, struct tcm_area *a)
> +{
> + return p->x >= a->p0.x && p->x <= a->p1.x &&
> + p->y >= a->p0.y && p->y <= a->p1.y;
> +}
> +
> +/* calculate area width */
> +static inline u16 __tcm_area_width(struct tcm_area *area)
> +{
> + return area->p1.x - area->p0.x + 1;
> +}
> +
> +/* calculate area height */
> +static inline u16 __tcm_area_height(struct tcm_area *area)
> +{
> + return area->p1.y - area->p0.y + 1;
> +}
> +
> +/* calculate number of slots in an area */
> +static inline u16 __tcm_sizeof(struct tcm_area *area)
> +{
> + return __tcm_area_width(area) * __tcm_area_height(area);
> +}
> +#define tcm_sizeof(area) __tcm_sizeof(&(area))
> +#define tcm_awidth(area) __tcm_area_width(&(area))
> +#define tcm_aheight(area) __tcm_area_height(&(area))
> +#define tcm_is_in(pt, area) __tcm_is_in(&(pt), &(area))
> +
> +#endif
> diff --git a/drivers/media/video/tiler/tcm/tcm-utils.h
> b/drivers/media/video/tiler/tcm/tcm-utils.h
> new file mode 100644
> index 0000000..0d1260a
> --- /dev/null
> +++ b/drivers/media/video/tiler/tcm/tcm-utils.h
> @@ -0,0 +1,54 @@
> +/*
> + * tcm_utils.h
> + *
> + * Utility functions for implementing TILER container managers.
> + *
> + * Author: Lajos Molnar <molnar@xxxxxx>
> + *
> + * Copyright (C) 2009-2010 Texas Instruments, Inc.
> + *
> + * This package 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 PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
> + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
> + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
> + */
> +
> +#ifndef TCM_UTILS_H
> +#define TCM_UTILS_H
> +
> +#include "../tcm.h"
Should avoid this type
> +
> +/* TCM_ALG_NAME must be defined to use the debug methods */
> +
> +#ifdef DEBUG
> +#define IFDEBUG(x) x
> +#else
> +/* compile-check debug statements even if not DEBUG */
> +#define IFDEBUG(x) do { if (0) x; } while (0)
> +#endif
> +
> +#define P(level, fmt, ...) \
> + IFDEBUG(printk(level TCM_ALG_NAME ":%d:%s()" fmt "\n", \
> + __LINE__, __func__, ##__VA_ARGS__))
> +
> +#define P1(fmt, ...) P(KERN_NOTICE, fmt, ##__VA_ARGS__)
> +#define P2(fmt, ...) P(KERN_INFO, fmt, ##__VA_ARGS__)
> +#define P3(fmt, ...) P(KERN_DEBUG, fmt, ##__VA_ARGS__)
Macro names can be bit more informative than p1 , P2 , P etc
> +
> +#define PA(level, msg, p_area) P##level(msg " (%03d %03d)-(%03d %03d)\n",
> \
> + (p_area)->p0.x, (p_area)->p0.y, (p_area)->p1.x, (p_area)->p1.y)
> +
> +/* assign coordinates to area */
> +static inline
> +void assign(struct tcm_area *a, u16 x0, u16 y0, u16 x1, u16 y1)
> +{
> + a->p0.x = x0;
> + a->p0.y = y0;
> + a->p1.x = x1;
> + a->p1.y = y1;
> +}
> +
> +#endif
> --
> 1.6.3.3
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