testsuite/systemtap.examples/traceio2.stp


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global device_of_interest

probe begin {
  /* The following is not the most efficient way to do this.
      One could directly put the result of usrdev2kerndev()
      into device_of_interest.  However, want to test out
      the other device functions */
  dev = usrdev2kerndev($1)
  device_of_interest = MKDEV(MAJOR(dev), MINOR(dev))
}

probe kernel.function ("vfs_write"),
      kernel.function ("vfs_read")
{
        dev_nr = $file->f_path->dentry->d_inode->i_sb->s_dev

        if (dev_nr == device_of_interest)
                printf ("%s(%d) %s 0x%x\n",
		        execname(), pid(), probefunc(), dev_nr)
}
/*
 * Flash memory access on SA11x0 based devices
 * 
 * (C) 2000 Nicolas Pitre <nico@cam.org>
 * 
 * $Id: sa1100-flash.c,v 1.47 2004/11/01 13:44:36 rmk Exp $
 */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/err.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/concat.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <asm/mach/flash.h>

#if 0
/*
 * This is here for documentation purposes only - until these people
 * submit their machine types.  It will be gone January 2005.
 */
static struct mtd_partition consus_partitions[] = {
	{
		.name		= "Consus boot firmware",
		.offset		= 0,
		.size		= 0x00040000,
		.mask_flags	= MTD_WRITABLE, /* force read-only */
	}, {
		.name		= "Consus kernel",
		.offset		= 0x00040000,
		.size		= 0x00100000,
		.mask_flags	= 0,
	}, {
		.name		= "Consus disk",
		.offset		= 0x00140000,
		/* The rest (up to 16M) for jffs.  We could put 0 and
		   make it find the size automatically, but right now
		   i have 32 megs.  jffs will use all 32 megs if given
		   the chance, and this leads to horrible problems
		   when you try to re-flash the image because blob
		   won't erase the whole partition. */
		.size		= 0x01000000 - 0x00140000,
		.mask_flags	= 0,
	}, {
		/* this disk is a secondary disk, which can be used as
		   needed, for simplicity, make it the size of the other
		   consus partition, although realistically it could be
		   the remainder of the disk (depending on the file
		   system used) */
		 .name		= "Consus disk2",
		 .offset	= 0x01000000,
		 .size		= 0x01000000 - 0x00140000,
		 .mask_flags	= 0,
	}
};

/* Frodo has 2 x 16M 28F128J3A flash chips in bank 0: */
static struct mtd_partition frodo_partitions[] =
{
	{
		.name		= "bootloader",
		.size		= 0x00040000,
		.offset		= 0x00000000,
		.mask_flags	= MTD_WRITEABLE
	}, {
		.name		= "bootloader params",
		.size		= 0x00040000,
		.offset		= MTDPART_OFS_APPEND,
		.mask_flags	= MTD_WRITEABLE
	}, {
		.name		= "kernel",
		.size		= 0x00100000,
		.offset		= MTDPART_OFS_APPEND,
		.mask_flags	= MTD_WRITEABLE
	}, {
		.name		= "ramdisk",
		.size		= 0x00400000,
		.offset		= MTDPART_OFS_APPEND,
		.mask_flags	= MTD_WRITEABLE
	}, {
		.name		= "file system",
		.size		= MTDPART_SIZ_FULL,
		.offset		= MTDPART_OFS_APPEND
	}
};

static struct mtd_partition jornada56x_partitions[] = {
	{
		.name		= "bootldr",
		.size		= 0x00040000,
		.offset		= 0,
		.mask_flags	= MTD_WRITEABLE,
	}, {
		.name		= "rootfs",
		.size		= MTDPART_SIZ_FULL,
		.offset		= MTDPART_OFS_APPEND,
	}
};

static void jornada56x_set_vpp(int vpp)
{
	if (vpp)
		GPSR = GPIO_GPIO26;
	else
		GPCR = GPIO_GPIO26;
	GPDR |= GPIO_GPIO26;
}

/*
 * Machine        Phys          Size    set_vpp
 * Consus    : SA1100_CS0_PHYS SZ_32M
 * Frodo     : SA1100_CS0_PHYS SZ_32M
 * Jornada56x: SA1100_CS0_PHYS SZ_32M jornada56x_set_vpp
 */
#endif

struct sa_subdev_info {
	char name[16];
	struct map_info map;
	struct mtd_info *mtd;
	struct flash_platform_data *plat;
};

struct sa_info {
	struct mtd_partition	*parts;
	struct mtd_info		*mtd;
	int			num_subdev;
	unsigned int		nr_parts;
	struct sa_subdev_info	subdev[0];
};

static void sa1100_set_vpp(struct map_info *map, int on)
{
	struct sa_subdev_info *subdev = container_of(map, struct sa_subdev_info, map);
	subdev->plat->set_vpp(on);
}

static void sa1100_destroy_subdev(struct sa_subdev_info *subdev)
{
	if (subdev->mtd)
		map_destroy(subdev->mtd);
	if (subdev->map.virt)
		iounmap(subdev->map.virt);
	release_mem_region(subdev->map.phys, subdev->map.size);
}

static int sa1100_probe_subdev(struct sa_subdev_info *subdev, struct resource *res)
{
	unsigned long phys;
	unsigned int size;
	int ret;

	phys = res->start;
	size = res->end - phys + 1;

	/*
	 * Retrieve the bankwidth from the MSC registers.
	 * We currently only implement CS0 and CS1 here.
	 */
	switch (phys) {
	default:
		printk(KERN_WARNING "SA1100 flash: unknown base address "
		       "0x%08lx, assuming CS0\n", phys);

	case SA1100_CS0_PHYS:
		subdev->map.bankwidth = (MSC0 & MSC_RBW) ? 2 : 4;
		break;

	case SA1100_CS1_PHYS:
		subdev->map.bankwidth = ((MSC0 >> 16) & MSC_RBW) ? 2 : 4;
		break;
	}

	if (!request_mem_region(phys, size, subdev->name)) {
		ret = -EBUSY;
		goto out;
	}

	if (subdev->plat->set_vpp)
		subdev->map.set_vpp = sa1100_set_vpp;

	subdev->map.phys = phys;
	subdev->map.size = size;