From: James Bottomley Date: Tue, 15 Jan 2008 17:11:46 +0000 (-0600) Subject: [SCSI] remove use_sg_chaining X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d3f46f39b7092594b498abc12f0c73b0b9913bde;p=linux.git [SCSI] remove use_sg_chaining With the sg table code, every SCSI driver is now either chain capable or broken (or has sg_tablesize set so chaining is never activated), so there's no need to have a check in the host template. Also tidy up the code by moving the scatterlist size defines into the SCSI includes and permit the last entry of the scatterlist pools not to be a power of two. Signed-off-by: James Bottomley --- diff --git a/arch/ia64/hp/sim/simscsi.c b/arch/ia64/hp/sim/simscsi.c index 6ef9b52199304..7661bb065fa57 100644 --- a/arch/ia64/hp/sim/simscsi.c +++ b/arch/ia64/hp/sim/simscsi.c @@ -360,7 +360,6 @@ static struct scsi_host_template driver_template = { .max_sectors = 1024, .cmd_per_lun = SIMSCSI_REQ_QUEUE_LEN, .use_clustering = DISABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static int __init diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index f2d2c7e2c76b9..195ce7c123191 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -1571,7 +1571,6 @@ static struct scsi_host_template srp_template = { .this_id = -1, .cmd_per_lun = SRP_SQ_SIZE, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = srp_host_attrs }; diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c index 1c244832c6c8a..b4912d1cee2aa 100644 --- a/drivers/scsi/3w-9xxx.c +++ b/drivers/scsi/3w-9xxx.c @@ -1990,7 +1990,6 @@ static struct scsi_host_template driver_template = { .max_sectors = TW_MAX_SECTORS, .cmd_per_lun = TW_MAX_CMDS_PER_LUN, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = twa_host_attrs, .emulated = 1 }; diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c index 59716ebeb10c1..d09532162217b 100644 --- a/drivers/scsi/3w-xxxx.c +++ b/drivers/scsi/3w-xxxx.c @@ -2261,7 +2261,6 @@ static struct scsi_host_template driver_template = { .max_sectors = TW_MAX_SECTORS, .cmd_per_lun = TW_MAX_CMDS_PER_LUN, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = tw_host_attrs, .emulated = 1 }; diff --git a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c index ead47c143ce04..4d3ebb1af4902 100644 --- a/drivers/scsi/BusLogic.c +++ b/drivers/scsi/BusLogic.c @@ -3575,7 +3575,6 @@ static struct scsi_host_template Bus_Logic_template = { .unchecked_isa_dma = 1, .max_sectors = 128, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; /* diff --git a/drivers/scsi/NCR53c406a.c b/drivers/scsi/NCR53c406a.c index 137d065db3da0..6961f78742aed 100644 --- a/drivers/scsi/NCR53c406a.c +++ b/drivers/scsi/NCR53c406a.c @@ -1065,7 +1065,6 @@ static struct scsi_host_template driver_template = .cmd_per_lun = 1 /* commands per lun */, .unchecked_isa_dma = 1 /* unchecked_isa_dma */, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #include "scsi_module.c" diff --git a/drivers/scsi/a100u2w.c b/drivers/scsi/a100u2w.c index d3a6d15fb77af..f608d4a1d6dae 100644 --- a/drivers/scsi/a100u2w.c +++ b/drivers/scsi/a100u2w.c @@ -1071,7 +1071,6 @@ static struct scsi_host_template inia100_template = { .sg_tablesize = SG_ALL, .cmd_per_lun = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static int __devinit inia100_probe_one(struct pci_dev *pdev, diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c index 61be22774e997..0e8267c1e9155 100644 --- a/drivers/scsi/aacraid/linit.c +++ b/drivers/scsi/aacraid/linit.c @@ -1032,7 +1032,6 @@ static struct scsi_host_template aac_driver_template = { .cmd_per_lun = AAC_NUM_IO_FIB, #endif .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .emulated = 1, }; diff --git a/drivers/scsi/aha1740.c b/drivers/scsi/aha1740.c index be58a0b097c76..7c45d88a205bf 100644 --- a/drivers/scsi/aha1740.c +++ b/drivers/scsi/aha1740.c @@ -563,7 +563,6 @@ static struct scsi_host_template aha1740_template = { .sg_tablesize = AHA1740_SCATTER, .cmd_per_lun = AHA1740_CMDLUN, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .eh_abort_handler = aha1740_eh_abort_handler, }; diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c index 3c4efa4ae543b..0146547929013 100644 --- a/drivers/scsi/aic7xxx/aic79xx_osm.c +++ b/drivers/scsi/aic7xxx/aic79xx_osm.c @@ -766,7 +766,6 @@ struct scsi_host_template aic79xx_driver_template = { .max_sectors = 8192, .cmd_per_lun = 2, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .slave_alloc = ahd_linux_slave_alloc, .slave_configure = ahd_linux_slave_configure, .target_alloc = ahd_linux_target_alloc, diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c index bff7f8c59856e..99a3b33a32335 100644 --- a/drivers/scsi/aic7xxx/aic7xxx_osm.c +++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c @@ -747,7 +747,6 @@ struct scsi_host_template aic7xxx_driver_template = { .max_sectors = 8192, .cmd_per_lun = 2, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .slave_alloc = ahc_linux_slave_alloc, .slave_configure = ahc_linux_slave_configure, .target_alloc = ahc_linux_target_alloc, diff --git a/drivers/scsi/aic7xxx_old.c b/drivers/scsi/aic7xxx_old.c index bcb0b870320c1..3bfd9296bbfaa 100644 --- a/drivers/scsi/aic7xxx_old.c +++ b/drivers/scsi/aic7xxx_old.c @@ -11141,7 +11141,6 @@ static struct scsi_host_template driver_template = { .max_sectors = 2048, .cmd_per_lun = 3, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #include "scsi_module.c" diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c index d80dba913a750..f4a202e8df267 100644 --- a/drivers/scsi/arcmsr/arcmsr_hba.c +++ b/drivers/scsi/arcmsr/arcmsr_hba.c @@ -122,7 +122,6 @@ static struct scsi_host_template arcmsr_scsi_host_template = { .max_sectors = ARCMSR_MAX_XFER_SECTORS, .cmd_per_lun = ARCMSR_MAX_CMD_PERLUN, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = arcmsr_host_attrs, }; #ifdef CONFIG_SCSI_ARCMSR_AER diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c index f93c73c0ba53d..22ef3716e7864 100644 --- a/drivers/scsi/dc395x.c +++ b/drivers/scsi/dc395x.c @@ -4763,7 +4763,6 @@ static struct scsi_host_template dc395x_driver_template = { .eh_bus_reset_handler = dc395x_eh_bus_reset, .unchecked_isa_dma = 0, .use_clustering = DISABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c index 19cce125124c8..c9dd8392aab20 100644 --- a/drivers/scsi/dpt_i2o.c +++ b/drivers/scsi/dpt_i2o.c @@ -3340,7 +3340,6 @@ static struct scsi_host_template driver_template = { .this_id = 7, .cmd_per_lun = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #include "scsi_module.c" MODULE_LICENSE("GPL"); diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c index 05163cefec12f..8be3d76656faa 100644 --- a/drivers/scsi/eata.c +++ b/drivers/scsi/eata.c @@ -524,7 +524,6 @@ static struct scsi_host_template driver_template = { .this_id = 7, .unchecked_isa_dma = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #if !defined(__BIG_ENDIAN_BITFIELD) && !defined(__LITTLE_ENDIAN_BITFIELD) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index 5ea1f986220cf..880c78bff0e14 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -342,7 +342,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) shost->use_clustering = sht->use_clustering; shost->ordered_tag = sht->ordered_tag; shost->active_mode = sht->supported_mode; - shost->use_sg_chaining = sht->use_sg_chaining; if (sht->supported_mode == MODE_UNKNOWN) /* means we didn't set it ... default to INITIATOR */ diff --git a/drivers/scsi/hptiop.c b/drivers/scsi/hptiop.c index 890f44fa0e1a9..ff149ad6bc4ed 100644 --- a/drivers/scsi/hptiop.c +++ b/drivers/scsi/hptiop.c @@ -906,7 +906,6 @@ static struct scsi_host_template driver_template = { .unchecked_isa_dma = 0, .emulated = 0, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .proc_name = driver_name, .shost_attrs = hptiop_attrs, .this_id = -1, diff --git a/drivers/scsi/ibmmca.c b/drivers/scsi/ibmmca.c index db004a4507327..4d15a62914e92 100644 --- a/drivers/scsi/ibmmca.c +++ b/drivers/scsi/ibmmca.c @@ -1501,7 +1501,6 @@ static struct scsi_host_template ibmmca_driver_template = { .sg_tablesize = 16, .cmd_per_lun = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static int ibmmca_probe(struct device *dev) diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 30819012898fc..78d46a900bb51 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -1600,7 +1600,6 @@ static struct scsi_host_template driver_template = { .this_id = -1, .sg_tablesize = SG_ALL, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = ibmvscsi_attrs, }; diff --git a/drivers/scsi/initio.c b/drivers/scsi/initio.c index a10a5c74b48db..0cc8868ea35d0 100644 --- a/drivers/scsi/initio.c +++ b/drivers/scsi/initio.c @@ -2833,7 +2833,6 @@ static struct scsi_host_template initio_template = { .sg_tablesize = SG_ALL, .cmd_per_lun = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static int initio_probe_one(struct pci_dev *pdev, diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index e5be5fd4ef583..b6f99dfbb038b 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -1933,7 +1933,6 @@ static struct scsi_host_template iscsi_sht = { .eh_device_reset_handler= iscsi_eh_device_reset, .eh_host_reset_handler = iscsi_eh_host_reset, .use_clustering = DISABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .slave_configure = iscsi_tcp_slave_configure, .proc_name = "iscsi_tcp", .this_id = -1, diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index 6483c62730b3b..fc5c3a42b05a6 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -1459,7 +1459,6 @@ struct scsi_host_template lpfc_template = { .scan_finished = lpfc_scan_finished, .this_id = -1, .sg_tablesize = LPFC_DEFAULT_SG_SEG_CNT, - .use_sg_chaining = ENABLE_SG_CHAINING, .cmd_per_lun = LPFC_CMD_PER_LUN, .use_clustering = ENABLE_CLUSTERING, .shost_attrs = lpfc_hba_attrs, @@ -1482,7 +1481,6 @@ struct scsi_host_template lpfc_vport_template = { .sg_tablesize = LPFC_DEFAULT_SG_SEG_CNT, .cmd_per_lun = LPFC_CMD_PER_LUN, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = lpfc_vport_attrs, .max_sectors = 0xFFFF, }; diff --git a/drivers/scsi/mac53c94.c b/drivers/scsi/mac53c94.c index a035001f44386..b12ad7c7c6736 100644 --- a/drivers/scsi/mac53c94.c +++ b/drivers/scsi/mac53c94.c @@ -402,7 +402,6 @@ static struct scsi_host_template mac53c94_template = { .sg_tablesize = SG_ALL, .cmd_per_lun = 1, .use_clustering = DISABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static int mac53c94_probe(struct macio_dev *mdev, const struct of_device_id *match) diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c index 765c24d2bc384..4d59ae8491a4e 100644 --- a/drivers/scsi/megaraid.c +++ b/drivers/scsi/megaraid.c @@ -4490,7 +4490,6 @@ static struct scsi_host_template megaraid_template = { .sg_tablesize = MAX_SGLIST, .cmd_per_lun = DEF_CMD_PER_LUN, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .eh_abort_handler = megaraid_abort, .eh_device_reset_handler = megaraid_reset, .eh_bus_reset_handler = megaraid_reset, diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c index 24e32e446e760..6db77c00e3eed 100644 --- a/drivers/scsi/megaraid/megaraid_mbox.c +++ b/drivers/scsi/megaraid/megaraid_mbox.c @@ -361,7 +361,6 @@ static struct scsi_host_template megaraid_template_g = { .eh_host_reset_handler = megaraid_reset_handler, .change_queue_depth = megaraid_change_queue_depth, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .sdev_attrs = megaraid_sdev_attrs, .shost_attrs = megaraid_shost_attrs, }; diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c index d7ec921865c4f..672c759ac24d7 100644 --- a/drivers/scsi/megaraid/megaraid_sas.c +++ b/drivers/scsi/megaraid/megaraid_sas.c @@ -1192,7 +1192,6 @@ static struct scsi_host_template megasas_template = { .eh_timed_out = megasas_reset_timer, .bios_param = megasas_bios_param, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; /** diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c index 7470ff39ab22f..651d09b08f2a2 100644 --- a/drivers/scsi/mesh.c +++ b/drivers/scsi/mesh.c @@ -1843,7 +1843,6 @@ static struct scsi_host_template mesh_template = { .sg_tablesize = SG_ALL, .cmd_per_lun = 2, .use_clustering = DISABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static int mesh_probe(struct macio_dev *mdev, const struct of_device_id *match) diff --git a/drivers/scsi/nsp32.c b/drivers/scsi/nsp32.c index 28161dc95e0d7..7fed35372150a 100644 --- a/drivers/scsi/nsp32.c +++ b/drivers/scsi/nsp32.c @@ -281,7 +281,6 @@ static struct scsi_host_template nsp32_template = { .cmd_per_lun = 1, .this_id = NSP32_HOST_SCSIID, .use_clustering = DISABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .eh_abort_handler = nsp32_eh_abort, .eh_bus_reset_handler = nsp32_eh_bus_reset, .eh_host_reset_handler = nsp32_eh_host_reset, diff --git a/drivers/scsi/pcmcia/sym53c500_cs.c b/drivers/scsi/pcmcia/sym53c500_cs.c index 969b9387a0c37..3454a57147496 100644 --- a/drivers/scsi/pcmcia/sym53c500_cs.c +++ b/drivers/scsi/pcmcia/sym53c500_cs.c @@ -692,7 +692,6 @@ static struct scsi_host_template sym53c500_driver_template = { .sg_tablesize = 32, .cmd_per_lun = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = SYM53C500_shost_attrs }; diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c index c94906abfee35..68c0d09ffe786 100644 --- a/drivers/scsi/qla1280.c +++ b/drivers/scsi/qla1280.c @@ -4204,7 +4204,6 @@ static struct scsi_host_template qla1280_driver_template = { .sg_tablesize = SG_ALL, .cmd_per_lun = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index aba1e6d480669..3954ed2d7b517 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -131,7 +131,6 @@ static struct scsi_host_template qla2x00_driver_template = { .this_id = -1, .cmd_per_lun = 3, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .sg_tablesize = SG_ALL, /* @@ -163,7 +162,6 @@ struct scsi_host_template qla24xx_driver_template = { .this_id = -1, .cmd_per_lun = 3, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .sg_tablesize = SG_ALL, .max_sectors = 0xFFFF, diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c index d3f86646cb088..2e2b9fedffcc7 100644 --- a/drivers/scsi/qla4xxx/ql4_os.c +++ b/drivers/scsi/qla4xxx/ql4_os.c @@ -94,7 +94,6 @@ static struct scsi_host_template qla4xxx_driver_template = { .this_id = -1, .cmd_per_lun = 3, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .sg_tablesize = SG_ALL, .max_sectors = 0xFFFF, diff --git a/drivers/scsi/qlogicfas.c b/drivers/scsi/qlogicfas.c index 1769f965eedf4..1e874f1fb5c64 100644 --- a/drivers/scsi/qlogicfas.c +++ b/drivers/scsi/qlogicfas.c @@ -197,7 +197,6 @@ static struct scsi_host_template qlogicfas_driver_template = { .sg_tablesize = SG_ALL, .cmd_per_lun = 1, .use_clustering = DISABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static __init int qlogicfas_init(void) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 4560713ecb14a..e1c7eebfe9070 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -34,13 +35,6 @@ #define SG_MEMPOOL_NR ARRAY_SIZE(scsi_sg_pools) #define SG_MEMPOOL_SIZE 2 -/* - * The maximum number of SG segments that we will put inside a scatterlist - * (unless chaining is used). Should ideally fit inside a single page, to - * avoid a higher order allocation. - */ -#define SCSI_MAX_SG_SEGMENTS 128 - struct scsi_host_sg_pool { size_t size; char *name; @@ -48,19 +42,26 @@ struct scsi_host_sg_pool { mempool_t *pool; }; -#define SP(x) { x, "sgpool-" #x } +#define SP(x) { x, "sgpool-" __stringify(x) } +#if (SCSI_MAX_SG_SEGMENTS < 32) +#error SCSI_MAX_SG_SEGMENTS is too small (must be 32 or greater) +#endif static struct scsi_host_sg_pool scsi_sg_pools[] = { SP(8), SP(16), -#if (SCSI_MAX_SG_SEGMENTS > 16) - SP(32), #if (SCSI_MAX_SG_SEGMENTS > 32) - SP(64), + SP(32), #if (SCSI_MAX_SG_SEGMENTS > 64) + SP(64), +#if (SCSI_MAX_SG_SEGMENTS > 128) SP(128), +#if (SCSI_MAX_SG_SEGMENTS > 256) +#error SCSI_MAX_SG_SEGMENTS is too large (256 MAX) #endif #endif #endif +#endif + SP(SCSI_MAX_SG_SEGMENTS) }; #undef SP @@ -692,42 +693,16 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error, return NULL; } -/* - * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit - * is totally arbitrary, a setting of 2048 will get you at least 8mb ios. - */ -#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048 - static inline unsigned int scsi_sgtable_index(unsigned short nents) { unsigned int index; - switch (nents) { - case 1 ... 8: + BUG_ON(nents > SCSI_MAX_SG_SEGMENTS); + + if (nents <= 8) index = 0; - break; - case 9 ... 16: - index = 1; - break; -#if (SCSI_MAX_SG_SEGMENTS > 16) - case 17 ... 32: - index = 2; - break; -#if (SCSI_MAX_SG_SEGMENTS > 32) - case 33 ... 64: - index = 3; - break; -#if (SCSI_MAX_SG_SEGMENTS > 64) - case 65 ... 128: - index = 4; - break; -#endif -#endif -#endif - default: - printk(KERN_ERR "scsi: bad segment count=%d\n", nents); - BUG(); - } + else + index = get_count_order(nents) - 3; return index; } @@ -1603,20 +1578,7 @@ struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, * this limit is imposed by hardware restrictions */ blk_queue_max_hw_segments(q, shost->sg_tablesize); - - /* - * In the future, sg chaining support will be mandatory and this - * ifdef can then go away. Right now we don't have all archs - * converted, so better keep it safe. - */ -#ifdef ARCH_HAS_SG_CHAIN - if (shost->use_sg_chaining) - blk_queue_max_phys_segments(q, SCSI_MAX_SG_CHAIN_SEGMENTS); - else - blk_queue_max_phys_segments(q, SCSI_MAX_SG_SEGMENTS); -#else - blk_queue_max_phys_segments(q, SCSI_MAX_SG_SEGMENTS); -#endif + blk_queue_max_phys_segments(q, SCSI_MAX_SG_CHAIN_SEGMENTS); blk_queue_max_sectors(q, shost->max_sectors); blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost)); diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c index e3fab3a6aed79..72f6d8015358d 100644 --- a/drivers/scsi/stex.c +++ b/drivers/scsi/stex.c @@ -1123,7 +1123,6 @@ static struct scsi_host_template driver_template = { .this_id = -1, .sg_tablesize = ST_MAX_SG, .cmd_per_lun = ST_CMD_PER_LUN, - .use_sg_chaining = ENABLE_SG_CHAINING, }; static int stex_set_dma_mask(struct pci_dev * pdev) diff --git a/drivers/scsi/sym53c416.c b/drivers/scsi/sym53c416.c index 1f6fd16803351..6325901e50934 100644 --- a/drivers/scsi/sym53c416.c +++ b/drivers/scsi/sym53c416.c @@ -840,6 +840,5 @@ static struct scsi_host_template driver_template = { .cmd_per_lun = 1, .unchecked_isa_dma = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #include "scsi_module.c" diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c index e939f3813233d..d39107b7669bf 100644 --- a/drivers/scsi/sym53c8xx_2/sym_glue.c +++ b/drivers/scsi/sym53c8xx_2/sym_glue.c @@ -1681,7 +1681,6 @@ static struct scsi_host_template sym2_template = { .eh_host_reset_handler = sym53c8xx_eh_host_reset_handler, .this_id = 7, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, .max_sectors = 0xFFFF, #ifdef SYM_LINUX_PROC_INFO_SUPPORT .proc_info = sym53c8xx_proc_info, diff --git a/drivers/scsi/u14-34f.c b/drivers/scsi/u14-34f.c index 4bc5407f96958..662c00451be44 100644 --- a/drivers/scsi/u14-34f.c +++ b/drivers/scsi/u14-34f.c @@ -451,7 +451,6 @@ static struct scsi_host_template driver_template = { .this_id = 7, .unchecked_isa_dma = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #if !defined(__BIG_ENDIAN_BITFIELD) && !defined(__LITTLE_ENDIAN_BITFIELD) diff --git a/drivers/scsi/ultrastor.c b/drivers/scsi/ultrastor.c index 75eca6b22db56..f385dce8dfbeb 100644 --- a/drivers/scsi/ultrastor.c +++ b/drivers/scsi/ultrastor.c @@ -1204,6 +1204,5 @@ static struct scsi_host_template driver_template = { .cmd_per_lun = ULTRASTOR_MAX_CMDS_PER_LUN, .unchecked_isa_dma = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #include "scsi_module.c" diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c index b4304ae78527e..c975c01b3a024 100644 --- a/drivers/scsi/wd7000.c +++ b/drivers/scsi/wd7000.c @@ -1671,7 +1671,6 @@ static struct scsi_host_template driver_template = { .cmd_per_lun = 1, .unchecked_isa_dma = 1, .use_clustering = ENABLE_CLUSTERING, - .use_sg_chaining = ENABLE_SG_CHAINING, }; #include "scsi_module.c" diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h index 702fcfeb37f19..0f55f5b248963 100644 --- a/include/scsi/scsi.h +++ b/include/scsi/scsi.h @@ -10,6 +10,25 @@ #include +/* + * The maximum number of SG segments that we will put inside a + * scatterlist (unless chaining is used). Should ideally fit inside a + * single page, to avoid a higher order allocation. We could define this + * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The + * minimum value is 32 + */ +#define SCSI_MAX_SG_SEGMENTS 128 + +/* + * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit + * is totally arbitrary, a setting of 2048 will get you at least 8mb ios. + */ +#ifdef ARCH_HAS_SG_CHAIN +#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048 +#else +#define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS +#endif + /* * SCSI command lengths */ diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index cb2bcab41dfb4..5c58d594126a9 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -39,9 +39,6 @@ struct blk_queue_tags; #define DISABLE_CLUSTERING 0 #define ENABLE_CLUSTERING 1 -#define DISABLE_SG_CHAINING 0 -#define ENABLE_SG_CHAINING 1 - enum scsi_eh_timer_return { EH_NOT_HANDLED, EH_HANDLED, @@ -445,15 +442,6 @@ struct scsi_host_template { */ unsigned ordered_tag:1; - /* - * true if the low-level driver can support sg chaining. this - * will be removed eventually when all the drivers are - * converted to support sg chaining. - * - * Status: OBSOLETE - */ - unsigned use_sg_chaining:1; - /* * Countdown for host blocking with no commands outstanding */ @@ -598,7 +586,6 @@ struct Scsi_Host { unsigned unchecked_isa_dma:1; unsigned use_clustering:1; unsigned use_blk_tcq:1; - unsigned use_sg_chaining:1; /* * Host has requested that no further requests come through for the