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![Tejun Heo](/assets/img/avatar_default.png)
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>
405 lines
9.2 KiB
C
405 lines
9.2 KiB
C
/*
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* manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
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*
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* based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
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* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
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* Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pnp.h>
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#include <linux/bitmap.h>
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#include <linux/mutex.h>
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#include "base.h"
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DEFINE_MUTEX(pnp_res_mutex);
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static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
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{
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struct resource *res, local_res;
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res = pnp_get_resource(dev, IORESOURCE_IO, idx);
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if (res) {
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pnp_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
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"flags %#lx\n", idx, (unsigned long long) res->start,
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(unsigned long long) res->end, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = 0;
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res->end = 0;
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if (!rule->size) {
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res->flags |= IORESOURCE_DISABLED;
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pnp_dbg(&dev->dev, " io %d disabled\n", idx);
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goto __add;
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}
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res->start = rule->min;
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res->end = res->start + rule->size - 1;
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while (!pnp_check_port(dev, res)) {
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res->start += rule->align;
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res->end = res->start + rule->size - 1;
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if (res->start > rule->max || !rule->align) {
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pnp_dbg(&dev->dev, " couldn't assign io %d "
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"(min %#llx max %#llx)\n", idx,
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(unsigned long long) rule->min,
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(unsigned long long) rule->max);
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return -EBUSY;
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}
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}
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__add:
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pnp_add_io_resource(dev, res->start, res->end, res->flags);
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return 0;
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}
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static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
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{
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struct resource *res, local_res;
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res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
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if (res) {
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pnp_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
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"flags %#lx\n", idx, (unsigned long long) res->start,
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(unsigned long long) res->end, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = 0;
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res->end = 0;
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if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
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res->flags |= IORESOURCE_READONLY;
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if (rule->flags & IORESOURCE_MEM_CACHEABLE)
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res->flags |= IORESOURCE_CACHEABLE;
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if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
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res->flags |= IORESOURCE_RANGELENGTH;
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if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
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res->flags |= IORESOURCE_SHADOWABLE;
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if (!rule->size) {
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res->flags |= IORESOURCE_DISABLED;
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pnp_dbg(&dev->dev, " mem %d disabled\n", idx);
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goto __add;
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}
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res->start = rule->min;
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res->end = res->start + rule->size - 1;
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while (!pnp_check_mem(dev, res)) {
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res->start += rule->align;
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res->end = res->start + rule->size - 1;
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if (res->start > rule->max || !rule->align) {
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pnp_dbg(&dev->dev, " couldn't assign mem %d "
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"(min %#llx max %#llx)\n", idx,
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(unsigned long long) rule->min,
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(unsigned long long) rule->max);
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return -EBUSY;
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}
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}
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__add:
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pnp_add_mem_resource(dev, res->start, res->end, res->flags);
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return 0;
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}
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static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
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{
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struct resource *res, local_res;
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int i;
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/* IRQ priority: this table is good for i386 */
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static unsigned short xtab[16] = {
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5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
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};
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res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
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if (res) {
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pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
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idx, (int) res->start, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = -1;
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res->end = -1;
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if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
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res->flags |= IORESOURCE_DISABLED;
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pnp_dbg(&dev->dev, " irq %d disabled\n", idx);
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goto __add;
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}
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/* TBD: need check for >16 IRQ */
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res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
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if (res->start < PNP_IRQ_NR) {
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res->end = res->start;
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goto __add;
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}
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for (i = 0; i < 16; i++) {
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if (test_bit(xtab[i], rule->map.bits)) {
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res->start = res->end = xtab[i];
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if (pnp_check_irq(dev, res))
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goto __add;
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}
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}
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if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
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res->start = -1;
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res->end = -1;
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res->flags |= IORESOURCE_DISABLED;
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pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx);
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goto __add;
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}
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pnp_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
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return -EBUSY;
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__add:
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pnp_add_irq_resource(dev, res->start, res->flags);
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return 0;
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}
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static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
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{
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struct resource *res, local_res;
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int i;
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/* DMA priority: this table is good for i386 */
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static unsigned short xtab[8] = {
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1, 3, 5, 6, 7, 0, 2, 4
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};
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res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
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if (res) {
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pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
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idx, (int) res->start, res->flags);
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return 0;
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}
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res = &local_res;
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res->flags = rule->flags | IORESOURCE_AUTO;
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res->start = -1;
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res->end = -1;
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for (i = 0; i < 8; i++) {
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if (rule->map & (1 << xtab[i])) {
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res->start = res->end = xtab[i];
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if (pnp_check_dma(dev, res))
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goto __add;
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}
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}
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#ifdef MAX_DMA_CHANNELS
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res->start = res->end = MAX_DMA_CHANNELS;
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#endif
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res->flags |= IORESOURCE_DISABLED;
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pnp_dbg(&dev->dev, " disable dma %d\n", idx);
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__add:
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pnp_add_dma_resource(dev, res->start, res->flags);
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return 0;
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}
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void pnp_init_resources(struct pnp_dev *dev)
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{
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pnp_free_resources(dev);
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}
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static void pnp_clean_resource_table(struct pnp_dev *dev)
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{
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struct pnp_resource *pnp_res, *tmp;
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list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
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if (pnp_res->res.flags & IORESOURCE_AUTO)
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pnp_free_resource(pnp_res);
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}
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}
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/**
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* pnp_assign_resources - assigns resources to the device based on the specified dependent number
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* @dev: pointer to the desired device
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* @set: the dependent function number
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*/
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static int pnp_assign_resources(struct pnp_dev *dev, int set)
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{
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struct pnp_option *option;
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int nport = 0, nmem = 0, nirq = 0, ndma = 0;
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int ret = 0;
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pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
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mutex_lock(&pnp_res_mutex);
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pnp_clean_resource_table(dev);
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list_for_each_entry(option, &dev->options, list) {
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if (pnp_option_is_dependent(option) &&
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pnp_option_set(option) != set)
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continue;
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switch (option->type) {
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case IORESOURCE_IO:
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ret = pnp_assign_port(dev, &option->u.port, nport++);
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break;
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case IORESOURCE_MEM:
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ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
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break;
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case IORESOURCE_IRQ:
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ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
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break;
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case IORESOURCE_DMA:
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ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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if (ret < 0)
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break;
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}
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mutex_unlock(&pnp_res_mutex);
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if (ret < 0) {
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pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
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pnp_clean_resource_table(dev);
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} else
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dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
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return ret;
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}
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/**
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* pnp_auto_config_dev - automatically assigns resources to a device
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* @dev: pointer to the desired device
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*/
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int pnp_auto_config_dev(struct pnp_dev *dev)
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{
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int i, ret;
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if (!pnp_can_configure(dev)) {
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pnp_dbg(&dev->dev, "configuration not supported\n");
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return -ENODEV;
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}
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ret = pnp_assign_resources(dev, 0);
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if (ret == 0)
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return 0;
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for (i = 1; i < dev->num_dependent_sets; i++) {
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ret = pnp_assign_resources(dev, i);
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if (ret == 0)
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return 0;
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}
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dev_err(&dev->dev, "unable to assign resources\n");
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return ret;
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}
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/**
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* pnp_start_dev - low-level start of the PnP device
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* @dev: pointer to the desired device
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*
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* assumes that resources have already been allocated
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*/
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int pnp_start_dev(struct pnp_dev *dev)
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{
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if (!pnp_can_write(dev)) {
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pnp_dbg(&dev->dev, "activation not supported\n");
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return -EINVAL;
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}
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dbg_pnp_show_resources(dev, "pnp_start_dev");
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if (dev->protocol->set(dev) < 0) {
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dev_err(&dev->dev, "activation failed\n");
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return -EIO;
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}
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dev_info(&dev->dev, "activated\n");
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return 0;
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}
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/**
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* pnp_stop_dev - low-level disable of the PnP device
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* @dev: pointer to the desired device
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*
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* does not free resources
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*/
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int pnp_stop_dev(struct pnp_dev *dev)
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{
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if (!pnp_can_disable(dev)) {
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pnp_dbg(&dev->dev, "disabling not supported\n");
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return -EINVAL;
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}
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if (dev->protocol->disable(dev) < 0) {
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dev_err(&dev->dev, "disable failed\n");
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return -EIO;
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}
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dev_info(&dev->dev, "disabled\n");
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return 0;
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}
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/**
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* pnp_activate_dev - activates a PnP device for use
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* @dev: pointer to the desired device
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*
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* does not validate or set resources so be careful.
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*/
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int pnp_activate_dev(struct pnp_dev *dev)
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{
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int error;
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if (dev->active)
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return 0;
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/* ensure resources are allocated */
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if (pnp_auto_config_dev(dev))
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return -EBUSY;
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error = pnp_start_dev(dev);
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if (error)
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return error;
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dev->active = 1;
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return 0;
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}
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/**
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* pnp_disable_dev - disables device
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* @dev: pointer to the desired device
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*
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* inform the correct pnp protocol so that resources can be used by other devices
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*/
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int pnp_disable_dev(struct pnp_dev *dev)
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{
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int error;
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if (!dev->active)
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return 0;
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error = pnp_stop_dev(dev);
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if (error)
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return error;
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dev->active = 0;
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/* release the resources so that other devices can use them */
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mutex_lock(&pnp_res_mutex);
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pnp_clean_resource_table(dev);
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mutex_unlock(&pnp_res_mutex);
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return 0;
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}
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EXPORT_SYMBOL(pnp_start_dev);
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EXPORT_SYMBOL(pnp_stop_dev);
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EXPORT_SYMBOL(pnp_activate_dev);
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EXPORT_SYMBOL(pnp_disable_dev);
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