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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>
329 lines
8.4 KiB
C
329 lines
8.4 KiB
C
/* -*-linux-c-*-
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* vendor-specific code for SCSI CD-ROM's goes here.
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*
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* This is needed becauce most of the new features (multisession and
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* the like) are too new to be included into the SCSI-II standard (to
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* be exact: there is'nt anything in my draft copy).
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*
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* Aug 1997: Ha! Got a SCSI-3 cdrom spec across my fingers. SCSI-3 does
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* multisession using the READ TOC command (like SONY).
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*
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* Rearranged stuff here: SCSI-3 is included allways, support
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* for NEC/TOSHIBA/HP commands is optional.
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*
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* Gerd Knorr <kraxel@cs.tu-berlin.de>
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*
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* --------------------------------------------------------------------------
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*
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* support for XA/multisession-CD's
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*
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* - NEC: Detection and support of multisession CD's.
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*
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* - TOSHIBA: Detection and support of multisession CD's.
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* Some XA-Sector tweaking, required for older drives.
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*
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* - SONY: Detection and support of multisession CD's.
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* added by Thomas Quinot <thomas@cuivre.freenix.fr>
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*
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* - PIONEER, HITACHI, PLEXTOR, MATSHITA, TEAC, PHILIPS: known to
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* work with SONY (SCSI3 now) code.
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*
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* - HP: Much like SONY, but a little different... (Thomas)
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* HP-Writers only ??? Maybe other CD-Writers work with this too ?
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* HP 6020 writers now supported.
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*/
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#include <linux/cdrom.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/bcd.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include "sr.h"
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#if 0
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#define DEBUG
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#endif
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/* here are some constants to sort the vendors into groups */
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#define VENDOR_SCSI3 1 /* default: scsi-3 mmc */
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#define VENDOR_NEC 2
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#define VENDOR_TOSHIBA 3
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#define VENDOR_WRITER 4 /* pre-scsi3 writers */
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#define VENDOR_TIMEOUT 30*HZ
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void sr_vendor_init(Scsi_CD *cd)
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{
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#ifndef CONFIG_BLK_DEV_SR_VENDOR
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cd->vendor = VENDOR_SCSI3;
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#else
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const char *vendor = cd->device->vendor;
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const char *model = cd->device->model;
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/* default */
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cd->vendor = VENDOR_SCSI3;
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if (cd->readcd_known)
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/* this is true for scsi3/mmc drives - no more checks */
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return;
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if (cd->device->type == TYPE_WORM) {
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cd->vendor = VENDOR_WRITER;
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} else if (!strncmp(vendor, "NEC", 3)) {
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cd->vendor = VENDOR_NEC;
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if (!strncmp(model, "CD-ROM DRIVE:25", 15) ||
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!strncmp(model, "CD-ROM DRIVE:36", 15) ||
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!strncmp(model, "CD-ROM DRIVE:83", 15) ||
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!strncmp(model, "CD-ROM DRIVE:84 ", 16)
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#if 0
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/* my NEC 3x returns the read-raw data if a read-raw
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is followed by a read for the same sector - aeb */
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|| !strncmp(model, "CD-ROM DRIVE:500", 16)
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#endif
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)
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/* these can't handle multisession, may hang */
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cd->cdi.mask |= CDC_MULTI_SESSION;
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} else if (!strncmp(vendor, "TOSHIBA", 7)) {
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cd->vendor = VENDOR_TOSHIBA;
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}
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#endif
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}
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/* small handy function for switching block length using MODE SELECT,
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* used by sr_read_sector() */
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int sr_set_blocklength(Scsi_CD *cd, int blocklength)
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{
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unsigned char *buffer; /* the buffer for the ioctl */
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struct packet_command cgc;
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struct ccs_modesel_head *modesel;
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int rc, density = 0;
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#ifdef CONFIG_BLK_DEV_SR_VENDOR
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if (cd->vendor == VENDOR_TOSHIBA)
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density = (blocklength > 2048) ? 0x81 : 0x83;
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#endif
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buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
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if (!buffer)
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return -ENOMEM;
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#ifdef DEBUG
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printk("%s: MODE SELECT 0x%x/%d\n", cd->cdi.name, density, blocklength);
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#endif
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memset(&cgc, 0, sizeof(struct packet_command));
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cgc.cmd[0] = MODE_SELECT;
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cgc.cmd[1] = (1 << 4);
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cgc.cmd[4] = 12;
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modesel = (struct ccs_modesel_head *) buffer;
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memset(modesel, 0, sizeof(*modesel));
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modesel->block_desc_length = 0x08;
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modesel->density = density;
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modesel->block_length_med = (blocklength >> 8) & 0xff;
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modesel->block_length_lo = blocklength & 0xff;
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cgc.buffer = buffer;
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cgc.buflen = sizeof(*modesel);
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cgc.data_direction = DMA_TO_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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if (0 == (rc = sr_do_ioctl(cd, &cgc))) {
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cd->device->sector_size = blocklength;
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}
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#ifdef DEBUG
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else
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printk("%s: switching blocklength to %d bytes failed\n",
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cd->cdi.name, blocklength);
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#endif
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kfree(buffer);
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return rc;
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}
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/* This function gets called after a media change. Checks if the CD is
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multisession, asks for offset etc. */
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int sr_cd_check(struct cdrom_device_info *cdi)
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{
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Scsi_CD *cd = cdi->handle;
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unsigned long sector;
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unsigned char *buffer; /* the buffer for the ioctl */
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struct packet_command cgc;
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int rc, no_multi;
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if (cd->cdi.mask & CDC_MULTI_SESSION)
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return 0;
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buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
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if (!buffer)
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return -ENOMEM;
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sector = 0; /* the multisession sector offset goes here */
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no_multi = 0; /* flag: the drive can't handle multisession */
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rc = 0;
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memset(&cgc, 0, sizeof(struct packet_command));
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switch (cd->vendor) {
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case VENDOR_SCSI3:
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cgc.cmd[0] = READ_TOC;
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cgc.cmd[8] = 12;
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cgc.cmd[9] = 0x40;
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cgc.buffer = buffer;
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cgc.buflen = 12;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0)
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break;
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if ((buffer[0] << 8) + buffer[1] < 0x0a) {
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printk(KERN_INFO "%s: Hmm, seems the drive "
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"doesn't support multisession CD's\n", cd->cdi.name);
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no_multi = 1;
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break;
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}
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sector = buffer[11] + (buffer[10] << 8) +
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(buffer[9] << 16) + (buffer[8] << 24);
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if (buffer[6] <= 1) {
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/* ignore sector offsets from first track */
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sector = 0;
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}
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break;
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#ifdef CONFIG_BLK_DEV_SR_VENDOR
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case VENDOR_NEC:{
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unsigned long min, sec, frame;
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cgc.cmd[0] = 0xde;
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cgc.cmd[1] = 0x03;
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cgc.cmd[2] = 0xb0;
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cgc.buffer = buffer;
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cgc.buflen = 0x16;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0)
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break;
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if (buffer[14] != 0 && buffer[14] != 0xb0) {
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printk(KERN_INFO "%s: Hmm, seems the cdrom "
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"doesn't support multisession CD's\n",
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cd->cdi.name);
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no_multi = 1;
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break;
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}
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min = bcd2bin(buffer[15]);
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sec = bcd2bin(buffer[16]);
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frame = bcd2bin(buffer[17]);
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sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
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break;
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}
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case VENDOR_TOSHIBA:{
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unsigned long min, sec, frame;
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/* we request some disc information (is it a XA-CD ?,
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* where starts the last session ?) */
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cgc.cmd[0] = 0xc7;
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cgc.cmd[1] = 0x03;
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cgc.buffer = buffer;
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cgc.buflen = 4;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc == -EINVAL) {
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printk(KERN_INFO "%s: Hmm, seems the drive "
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"doesn't support multisession CD's\n",
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cd->cdi.name);
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no_multi = 1;
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break;
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}
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if (rc != 0)
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break;
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min = bcd2bin(buffer[1]);
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sec = bcd2bin(buffer[2]);
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frame = bcd2bin(buffer[3]);
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sector = min * CD_SECS * CD_FRAMES + sec * CD_FRAMES + frame;
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if (sector)
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sector -= CD_MSF_OFFSET;
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sr_set_blocklength(cd, 2048);
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break;
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}
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case VENDOR_WRITER:
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cgc.cmd[0] = READ_TOC;
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cgc.cmd[8] = 0x04;
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cgc.cmd[9] = 0x40;
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cgc.buffer = buffer;
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cgc.buflen = 0x04;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0) {
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break;
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}
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if ((rc = buffer[2]) == 0) {
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printk(KERN_WARNING
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"%s: No finished session\n", cd->cdi.name);
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break;
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}
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cgc.cmd[0] = READ_TOC; /* Read TOC */
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cgc.cmd[6] = rc & 0x7f; /* number of last session */
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cgc.cmd[8] = 0x0c;
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cgc.cmd[9] = 0x40;
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cgc.buffer = buffer;
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cgc.buflen = 12;
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cgc.quiet = 1;
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cgc.data_direction = DMA_FROM_DEVICE;
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cgc.timeout = VENDOR_TIMEOUT;
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rc = sr_do_ioctl(cd, &cgc);
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if (rc != 0) {
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break;
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}
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sector = buffer[11] + (buffer[10] << 8) +
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(buffer[9] << 16) + (buffer[8] << 24);
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break;
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#endif /* CONFIG_BLK_DEV_SR_VENDOR */
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default:
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/* should not happen */
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printk(KERN_WARNING
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"%s: unknown vendor code (%i), not initialized ?\n",
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cd->cdi.name, cd->vendor);
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sector = 0;
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no_multi = 1;
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break;
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}
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cd->ms_offset = sector;
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cd->xa_flag = 0;
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if (CDS_AUDIO != sr_disk_status(cdi) && 1 == sr_is_xa(cd))
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cd->xa_flag = 1;
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if (2048 != cd->device->sector_size) {
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sr_set_blocklength(cd, 2048);
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}
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if (no_multi)
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cdi->mask |= CDC_MULTI_SESSION;
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#ifdef DEBUG
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if (sector)
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printk(KERN_DEBUG "%s: multisession offset=%lu\n",
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cd->cdi.name, sector);
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#endif
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kfree(buffer);
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return rc;
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}
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