mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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5a0e3ad6af
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
661 lines
15 KiB
C
661 lines
15 KiB
C
/*
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* Core registration and callback routines for MTD
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* drivers and users.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/major.h>
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#include <linux/fs.h>
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#include <linux/err.h>
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#include <linux/ioctl.h>
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#include <linux/init.h>
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#include <linux/mtd/compatmac.h>
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#include <linux/proc_fs.h>
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#include <linux/mtd/mtd.h>
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#include "internal.h"
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#include "mtdcore.h"
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static int mtd_cls_suspend(struct device *dev, pm_message_t state);
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static int mtd_cls_resume(struct device *dev);
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static struct class mtd_class = {
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.name = "mtd",
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.owner = THIS_MODULE,
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.suspend = mtd_cls_suspend,
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.resume = mtd_cls_resume,
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};
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/* These are exported solely for the purpose of mtd_blkdevs.c. You
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should not use them for _anything_ else */
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DEFINE_MUTEX(mtd_table_mutex);
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struct mtd_info *mtd_table[MAX_MTD_DEVICES];
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EXPORT_SYMBOL_GPL(mtd_table_mutex);
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EXPORT_SYMBOL_GPL(mtd_table);
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static LIST_HEAD(mtd_notifiers);
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#if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE)
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#define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2)
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#else
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#define MTD_DEVT(index) 0
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#endif
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/* REVISIT once MTD uses the driver model better, whoever allocates
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* the mtd_info will probably want to use the release() hook...
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*/
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static void mtd_release(struct device *dev)
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{
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dev_t index = MTD_DEVT(dev_to_mtd(dev)->index);
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/* remove /dev/mtdXro node if needed */
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if (index)
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device_destroy(&mtd_class, index + 1);
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}
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static int mtd_cls_suspend(struct device *dev, pm_message_t state)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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if (mtd && mtd->suspend)
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return mtd->suspend(mtd);
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else
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return 0;
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}
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static int mtd_cls_resume(struct device *dev)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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if (mtd && mtd->resume)
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mtd->resume(mtd);
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return 0;
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}
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static ssize_t mtd_type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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char *type;
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switch (mtd->type) {
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case MTD_ABSENT:
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type = "absent";
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break;
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case MTD_RAM:
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type = "ram";
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break;
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case MTD_ROM:
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type = "rom";
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break;
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case MTD_NORFLASH:
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type = "nor";
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break;
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case MTD_NANDFLASH:
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type = "nand";
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break;
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case MTD_DATAFLASH:
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type = "dataflash";
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break;
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case MTD_UBIVOLUME:
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type = "ubi";
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break;
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default:
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type = "unknown";
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}
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return snprintf(buf, PAGE_SIZE, "%s\n", type);
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}
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static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL);
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static ssize_t mtd_flags_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags);
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}
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static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL);
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static ssize_t mtd_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)mtd->size);
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}
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static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL);
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static ssize_t mtd_erasesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize);
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}
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static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL);
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static ssize_t mtd_writesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize);
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}
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static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL);
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static ssize_t mtd_subpagesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft;
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return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize);
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}
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static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL);
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static ssize_t mtd_oobsize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize);
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}
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static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL);
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static ssize_t mtd_numeraseregions_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions);
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}
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static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show,
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NULL);
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static ssize_t mtd_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_to_mtd(dev);
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return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name);
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}
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static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL);
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static struct attribute *mtd_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_flags.attr,
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&dev_attr_size.attr,
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&dev_attr_erasesize.attr,
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&dev_attr_writesize.attr,
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&dev_attr_subpagesize.attr,
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&dev_attr_oobsize.attr,
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&dev_attr_numeraseregions.attr,
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&dev_attr_name.attr,
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NULL,
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};
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static struct attribute_group mtd_group = {
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.attrs = mtd_attrs,
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};
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static const struct attribute_group *mtd_groups[] = {
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&mtd_group,
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NULL,
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};
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static struct device_type mtd_devtype = {
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.name = "mtd",
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.groups = mtd_groups,
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.release = mtd_release,
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};
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/**
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* add_mtd_device - register an MTD device
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* @mtd: pointer to new MTD device info structure
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*
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* Add a device to the list of MTD devices present in the system, and
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* notify each currently active MTD 'user' of its arrival. Returns
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* zero on success or 1 on failure, which currently will only happen
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* if the number of present devices exceeds MAX_MTD_DEVICES (i.e. 16)
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* or there's a sysfs error.
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*/
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int add_mtd_device(struct mtd_info *mtd)
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{
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int i;
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if (!mtd->backing_dev_info) {
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switch (mtd->type) {
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case MTD_RAM:
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mtd->backing_dev_info = &mtd_bdi_rw_mappable;
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break;
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case MTD_ROM:
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mtd->backing_dev_info = &mtd_bdi_ro_mappable;
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break;
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default:
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mtd->backing_dev_info = &mtd_bdi_unmappable;
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break;
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}
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}
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BUG_ON(mtd->writesize == 0);
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mutex_lock(&mtd_table_mutex);
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for (i=0; i < MAX_MTD_DEVICES; i++)
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if (!mtd_table[i]) {
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struct mtd_notifier *not;
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mtd_table[i] = mtd;
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mtd->index = i;
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mtd->usecount = 0;
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if (is_power_of_2(mtd->erasesize))
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mtd->erasesize_shift = ffs(mtd->erasesize) - 1;
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else
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mtd->erasesize_shift = 0;
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if (is_power_of_2(mtd->writesize))
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mtd->writesize_shift = ffs(mtd->writesize) - 1;
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else
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mtd->writesize_shift = 0;
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mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1;
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mtd->writesize_mask = (1 << mtd->writesize_shift) - 1;
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/* Some chips always power up locked. Unlock them now */
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if ((mtd->flags & MTD_WRITEABLE)
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&& (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) {
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if (mtd->unlock(mtd, 0, mtd->size))
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printk(KERN_WARNING
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"%s: unlock failed, "
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"writes may not work\n",
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mtd->name);
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}
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/* Caller should have set dev.parent to match the
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* physical device.
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*/
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mtd->dev.type = &mtd_devtype;
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mtd->dev.class = &mtd_class;
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mtd->dev.devt = MTD_DEVT(i);
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dev_set_name(&mtd->dev, "mtd%d", i);
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dev_set_drvdata(&mtd->dev, mtd);
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if (device_register(&mtd->dev) != 0) {
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mtd_table[i] = NULL;
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break;
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}
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if (MTD_DEVT(i))
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device_create(&mtd_class, mtd->dev.parent,
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MTD_DEVT(i) + 1,
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NULL, "mtd%dro", i);
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DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
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/* No need to get a refcount on the module containing
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the notifier, since we hold the mtd_table_mutex */
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list_for_each_entry(not, &mtd_notifiers, list)
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not->add(mtd);
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mutex_unlock(&mtd_table_mutex);
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/* We _know_ we aren't being removed, because
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our caller is still holding us here. So none
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of this try_ nonsense, and no bitching about it
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either. :) */
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__module_get(THIS_MODULE);
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return 0;
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}
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mutex_unlock(&mtd_table_mutex);
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return 1;
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}
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/**
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* del_mtd_device - unregister an MTD device
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* @mtd: pointer to MTD device info structure
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*
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* Remove a device from the list of MTD devices present in the system,
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* and notify each currently active MTD 'user' of its departure.
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* Returns zero on success or 1 on failure, which currently will happen
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* if the requested device does not appear to be present in the list.
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*/
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int del_mtd_device (struct mtd_info *mtd)
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{
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int ret;
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mutex_lock(&mtd_table_mutex);
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if (mtd_table[mtd->index] != mtd) {
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ret = -ENODEV;
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} else if (mtd->usecount) {
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printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
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mtd->index, mtd->name, mtd->usecount);
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ret = -EBUSY;
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} else {
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struct mtd_notifier *not;
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device_unregister(&mtd->dev);
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/* No need to get a refcount on the module containing
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the notifier, since we hold the mtd_table_mutex */
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list_for_each_entry(not, &mtd_notifiers, list)
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not->remove(mtd);
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mtd_table[mtd->index] = NULL;
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module_put(THIS_MODULE);
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ret = 0;
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}
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mutex_unlock(&mtd_table_mutex);
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return ret;
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}
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/**
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* register_mtd_user - register a 'user' of MTD devices.
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* @new: pointer to notifier info structure
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*
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* Registers a pair of callbacks function to be called upon addition
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* or removal of MTD devices. Causes the 'add' callback to be immediately
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* invoked for each MTD device currently present in the system.
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*/
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void register_mtd_user (struct mtd_notifier *new)
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{
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int i;
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mutex_lock(&mtd_table_mutex);
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list_add(&new->list, &mtd_notifiers);
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__module_get(THIS_MODULE);
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for (i=0; i< MAX_MTD_DEVICES; i++)
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if (mtd_table[i])
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new->add(mtd_table[i]);
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mutex_unlock(&mtd_table_mutex);
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}
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/**
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* unregister_mtd_user - unregister a 'user' of MTD devices.
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* @old: pointer to notifier info structure
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*
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* Removes a callback function pair from the list of 'users' to be
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* notified upon addition or removal of MTD devices. Causes the
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* 'remove' callback to be immediately invoked for each MTD device
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* currently present in the system.
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*/
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int unregister_mtd_user (struct mtd_notifier *old)
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{
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int i;
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mutex_lock(&mtd_table_mutex);
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module_put(THIS_MODULE);
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for (i=0; i< MAX_MTD_DEVICES; i++)
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if (mtd_table[i])
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old->remove(mtd_table[i]);
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list_del(&old->list);
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mutex_unlock(&mtd_table_mutex);
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return 0;
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}
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/**
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* get_mtd_device - obtain a validated handle for an MTD device
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* @mtd: last known address of the required MTD device
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* @num: internal device number of the required MTD device
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*
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* Given a number and NULL address, return the num'th entry in the device
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* table, if any. Given an address and num == -1, search the device table
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* for a device with that address and return if it's still present. Given
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* both, return the num'th driver only if its address matches. Return
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* error code if not.
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*/
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struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
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{
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struct mtd_info *ret = NULL;
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int i, err = -ENODEV;
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mutex_lock(&mtd_table_mutex);
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if (num == -1) {
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for (i=0; i< MAX_MTD_DEVICES; i++)
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if (mtd_table[i] == mtd)
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ret = mtd_table[i];
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} else if (num >= 0 && num < MAX_MTD_DEVICES) {
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ret = mtd_table[num];
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if (mtd && mtd != ret)
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ret = NULL;
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}
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if (!ret)
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goto out_unlock;
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|
|
if (!try_module_get(ret->owner))
|
|
goto out_unlock;
|
|
|
|
if (ret->get_device) {
|
|
err = ret->get_device(ret);
|
|
if (err)
|
|
goto out_put;
|
|
}
|
|
|
|
ret->usecount++;
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return ret;
|
|
|
|
out_put:
|
|
module_put(ret->owner);
|
|
out_unlock:
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* get_mtd_device_nm - obtain a validated handle for an MTD device by
|
|
* device name
|
|
* @name: MTD device name to open
|
|
*
|
|
* This function returns MTD device description structure in case of
|
|
* success and an error code in case of failure.
|
|
*/
|
|
|
|
struct mtd_info *get_mtd_device_nm(const char *name)
|
|
{
|
|
int i, err = -ENODEV;
|
|
struct mtd_info *mtd = NULL;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
for (i = 0; i < MAX_MTD_DEVICES; i++) {
|
|
if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
|
|
mtd = mtd_table[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!mtd)
|
|
goto out_unlock;
|
|
|
|
if (!try_module_get(mtd->owner))
|
|
goto out_unlock;
|
|
|
|
if (mtd->get_device) {
|
|
err = mtd->get_device(mtd);
|
|
if (err)
|
|
goto out_put;
|
|
}
|
|
|
|
mtd->usecount++;
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return mtd;
|
|
|
|
out_put:
|
|
module_put(mtd->owner);
|
|
out_unlock:
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void put_mtd_device(struct mtd_info *mtd)
|
|
{
|
|
int c;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
c = --mtd->usecount;
|
|
if (mtd->put_device)
|
|
mtd->put_device(mtd);
|
|
mutex_unlock(&mtd_table_mutex);
|
|
BUG_ON(c < 0);
|
|
|
|
module_put(mtd->owner);
|
|
}
|
|
|
|
/* default_mtd_writev - default mtd writev method for MTD devices that
|
|
* don't implement their own
|
|
*/
|
|
|
|
int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
|
|
unsigned long count, loff_t to, size_t *retlen)
|
|
{
|
|
unsigned long i;
|
|
size_t totlen = 0, thislen;
|
|
int ret = 0;
|
|
|
|
if(!mtd->write) {
|
|
ret = -EROFS;
|
|
} else {
|
|
for (i=0; i<count; i++) {
|
|
if (!vecs[i].iov_len)
|
|
continue;
|
|
ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
|
|
totlen += thislen;
|
|
if (ret || thislen != vecs[i].iov_len)
|
|
break;
|
|
to += vecs[i].iov_len;
|
|
}
|
|
}
|
|
if (retlen)
|
|
*retlen = totlen;
|
|
return ret;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(add_mtd_device);
|
|
EXPORT_SYMBOL_GPL(del_mtd_device);
|
|
EXPORT_SYMBOL_GPL(get_mtd_device);
|
|
EXPORT_SYMBOL_GPL(get_mtd_device_nm);
|
|
EXPORT_SYMBOL_GPL(put_mtd_device);
|
|
EXPORT_SYMBOL_GPL(register_mtd_user);
|
|
EXPORT_SYMBOL_GPL(unregister_mtd_user);
|
|
EXPORT_SYMBOL_GPL(default_mtd_writev);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/*====================================================================*/
|
|
/* Support for /proc/mtd */
|
|
|
|
static struct proc_dir_entry *proc_mtd;
|
|
|
|
static inline int mtd_proc_info (char *buf, int i)
|
|
{
|
|
struct mtd_info *this = mtd_table[i];
|
|
|
|
if (!this)
|
|
return 0;
|
|
|
|
return sprintf(buf, "mtd%d: %8.8llx %8.8x \"%s\"\n", i,
|
|
(unsigned long long)this->size,
|
|
this->erasesize, this->name);
|
|
}
|
|
|
|
static int mtd_read_proc (char *page, char **start, off_t off, int count,
|
|
int *eof, void *data_unused)
|
|
{
|
|
int len, l, i;
|
|
off_t begin = 0;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
len = sprintf(page, "dev: size erasesize name\n");
|
|
for (i=0; i< MAX_MTD_DEVICES; i++) {
|
|
|
|
l = mtd_proc_info(page + len, i);
|
|
len += l;
|
|
if (len+begin > off+count)
|
|
goto done;
|
|
if (len+begin < off) {
|
|
begin += len;
|
|
len = 0;
|
|
}
|
|
}
|
|
|
|
*eof = 1;
|
|
|
|
done:
|
|
mutex_unlock(&mtd_table_mutex);
|
|
if (off >= len+begin)
|
|
return 0;
|
|
*start = page + (off-begin);
|
|
return ((count < begin+len-off) ? count : begin+len-off);
|
|
}
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/*====================================================================*/
|
|
/* Init code */
|
|
|
|
static int __init init_mtd(void)
|
|
{
|
|
int ret;
|
|
ret = class_register(&mtd_class);
|
|
|
|
if (ret) {
|
|
pr_err("Error registering mtd class: %d\n", ret);
|
|
return ret;
|
|
}
|
|
#ifdef CONFIG_PROC_FS
|
|
if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
|
|
proc_mtd->read_proc = mtd_read_proc;
|
|
#endif /* CONFIG_PROC_FS */
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cleanup_mtd(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
if (proc_mtd)
|
|
remove_proc_entry( "mtd", NULL);
|
|
#endif /* CONFIG_PROC_FS */
|
|
class_unregister(&mtd_class);
|
|
}
|
|
|
|
module_init(init_mtd);
|
|
module_exit(cleanup_mtd);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
MODULE_DESCRIPTION("Core MTD registration and access routines");
|