![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>
275 lines
6.8 KiB
C
275 lines
6.8 KiB
C
/*
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* Serial Attached SCSI (SAS) Expander discovery and configuration
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*
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* Copyright (C) 2007 James E.J. Bottomley
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* <James.Bottomley@HansenPartnership.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 only.
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*/
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#include <linux/scatterlist.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include "sas_internal.h"
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_sas.h>
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#include "../scsi_sas_internal.h"
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static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
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u8 phy_id)
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{
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struct sas_phy *phy;
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struct sas_rphy *rphy;
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if (phy_id >= sas_ha->num_phys) {
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resp_data[2] = SMP_RESP_NO_PHY;
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return;
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}
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resp_data[2] = SMP_RESP_FUNC_ACC;
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phy = sas_ha->sas_phy[phy_id]->phy;
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resp_data[9] = phy_id;
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resp_data[13] = phy->negotiated_linkrate;
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memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE);
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memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr,
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SAS_ADDR_SIZE);
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resp_data[40] = (phy->minimum_linkrate << 4) |
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phy->minimum_linkrate_hw;
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resp_data[41] = (phy->maximum_linkrate << 4) |
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phy->maximum_linkrate_hw;
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if (!sas_ha->sas_phy[phy_id]->port ||
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!sas_ha->sas_phy[phy_id]->port->port_dev)
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return;
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rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
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resp_data[12] = rphy->identify.device_type << 4;
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resp_data[14] = rphy->identify.initiator_port_protocols;
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resp_data[15] = rphy->identify.target_port_protocols;
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}
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static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
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u8 phy_id)
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{
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struct sas_rphy *rphy;
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struct dev_to_host_fis *fis;
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int i;
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if (phy_id >= sas_ha->num_phys) {
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resp_data[2] = SMP_RESP_NO_PHY;
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return;
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}
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resp_data[2] = SMP_RESP_PHY_NO_SATA;
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if (!sas_ha->sas_phy[phy_id]->port)
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return;
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rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
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fis = (struct dev_to_host_fis *)
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sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd;
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if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA)
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return;
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resp_data[2] = SMP_RESP_FUNC_ACC;
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resp_data[9] = phy_id;
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memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr,
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SAS_ADDR_SIZE);
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/* check to see if we have a valid d2h fis */
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if (fis->fis_type != 0x34)
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return;
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/* the d2h fis is required by the standard to be in LE format */
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for (i = 0; i < 20; i += 4) {
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u8 *dst = resp_data + 24 + i, *src =
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&sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i];
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dst[0] = src[3];
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dst[1] = src[2];
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dst[2] = src[1];
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dst[3] = src[0];
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}
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}
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static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id,
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u8 phy_op, enum sas_linkrate min,
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enum sas_linkrate max, u8 *resp_data)
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{
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struct sas_internal *i =
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to_sas_internal(sas_ha->core.shost->transportt);
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struct sas_phy_linkrates rates;
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if (phy_id >= sas_ha->num_phys) {
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resp_data[2] = SMP_RESP_NO_PHY;
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return;
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}
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switch (phy_op) {
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case PHY_FUNC_NOP:
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case PHY_FUNC_LINK_RESET:
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case PHY_FUNC_HARD_RESET:
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case PHY_FUNC_DISABLE:
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case PHY_FUNC_CLEAR_ERROR_LOG:
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case PHY_FUNC_CLEAR_AFFIL:
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case PHY_FUNC_TX_SATA_PS_SIGNAL:
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break;
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default:
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resp_data[2] = SMP_RESP_PHY_UNK_OP;
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return;
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}
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rates.minimum_linkrate = min;
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rates.maximum_linkrate = max;
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if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates))
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resp_data[2] = SMP_RESP_FUNC_FAILED;
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else
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resp_data[2] = SMP_RESP_FUNC_ACC;
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}
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int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
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struct request *rsp)
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{
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u8 *req_data = NULL, *resp_data = NULL, *buf;
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
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int error = -EINVAL;
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/* eight is the minimum size for request and response frames */
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if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
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goto out;
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if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
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bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
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shost_printk(KERN_ERR, shost,
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"SMP request/response frame crosses page boundary");
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goto out;
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}
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req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
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/* make sure frame can always be built ... we copy
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* back only the requested length */
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resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
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if (!req_data || !resp_data) {
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error = -ENOMEM;
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goto out;
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}
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local_irq_disable();
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buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
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memcpy(req_data, buf, blk_rq_bytes(req));
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kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
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local_irq_enable();
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if (req_data[0] != SMP_REQUEST)
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goto out;
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/* always succeeds ... even if we can't process the request
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* the result is in the response frame */
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error = 0;
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/* set up default don't know response */
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resp_data[0] = SMP_RESPONSE;
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resp_data[1] = req_data[1];
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resp_data[2] = SMP_RESP_FUNC_UNK;
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switch (req_data[1]) {
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case SMP_REPORT_GENERAL:
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req->resid_len -= 8;
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rsp->resid_len -= 32;
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resp_data[2] = SMP_RESP_FUNC_ACC;
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resp_data[9] = sas_ha->num_phys;
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break;
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case SMP_REPORT_MANUF_INFO:
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req->resid_len -= 8;
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rsp->resid_len -= 64;
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resp_data[2] = SMP_RESP_FUNC_ACC;
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memcpy(resp_data + 12, shost->hostt->name,
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SAS_EXPANDER_VENDOR_ID_LEN);
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memcpy(resp_data + 20, "libsas virt phy",
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SAS_EXPANDER_PRODUCT_ID_LEN);
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break;
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case SMP_READ_GPIO_REG:
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/* FIXME: need GPIO support in the transport class */
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break;
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case SMP_DISCOVER:
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req->resid_len -= 16;
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if ((int)req->resid_len < 0) {
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req->resid_len = 0;
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error = -EINVAL;
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goto out;
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}
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rsp->resid_len -= 56;
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sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
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break;
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case SMP_REPORT_PHY_ERR_LOG:
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/* FIXME: could implement this with additional
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* libsas callbacks providing the HW supports it */
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break;
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case SMP_REPORT_PHY_SATA:
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req->resid_len -= 16;
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if ((int)req->resid_len < 0) {
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req->resid_len = 0;
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error = -EINVAL;
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goto out;
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}
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rsp->resid_len -= 60;
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sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
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break;
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case SMP_REPORT_ROUTE_INFO:
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/* Can't implement; hosts have no routes */
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break;
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case SMP_WRITE_GPIO_REG:
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/* FIXME: need GPIO support in the transport class */
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break;
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case SMP_CONF_ROUTE_INFO:
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/* Can't implement; hosts have no routes */
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break;
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case SMP_PHY_CONTROL:
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req->resid_len -= 44;
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if ((int)req->resid_len < 0) {
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req->resid_len = 0;
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error = -EINVAL;
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goto out;
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}
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rsp->resid_len -= 8;
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sas_phy_control(sas_ha, req_data[9], req_data[10],
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req_data[32] >> 4, req_data[33] >> 4,
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resp_data);
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break;
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case SMP_PHY_TEST_FUNCTION:
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/* FIXME: should this be implemented? */
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break;
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default:
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/* probably a 2.0 function */
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break;
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}
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local_irq_disable();
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buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
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memcpy(buf, resp_data, blk_rq_bytes(rsp));
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flush_kernel_dcache_page(bio_page(rsp->bio));
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kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
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local_irq_enable();
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out:
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kfree(req_data);
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kfree(resp_data);
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return error;
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}
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