Follow the example of the atari_NCR5380.c core driver and adopt the NCR5380_dma_xfer_len() hook. Implement NCR5380_dma_xfer_len() for dtc.c and g_NCR5380.c to take care of the limitations of these cards. Keep the default for drivers using PSEUDO_DMA. Eliminate the unused macro LIMIT_TRANSFERSIZE. Signed-off-by: Finn Thain --- drivers/scsi/NCR5380.c | 32 +++++--------------------------- drivers/scsi/arm/cumana_1.c | 3 +++ drivers/scsi/arm/oak.c | 2 ++ drivers/scsi/atari_NCR5380.c | 8 +++++--- drivers/scsi/dtc.c | 14 ++++++++++++++ drivers/scsi/dtc.h | 3 +++ drivers/scsi/g_NCR5380.c | 15 +++++++++++++++ drivers/scsi/g_NCR5380.h | 3 +++ drivers/scsi/mac_scsi.c | 1 + drivers/scsi/pas16.h | 2 ++ drivers/scsi/t128.h | 2 ++ 11 files changed, 55 insertions(+), 30 deletions(-) Index: linux/drivers/scsi/NCR5380.c =================================================================== --- linux.orig/drivers/scsi/NCR5380.c 2015-11-18 19:33:34.000000000 +1100 +++ linux/drivers/scsi/NCR5380.c 2015-11-18 19:33:35.000000000 +1100 @@ -201,11 +201,6 @@ * DONT_USE_INTR - if defined, never use interrupts, even if we probe or * override-configure an IRQ. * - * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 - * bytes at a time. Since interrupts are disabled by default during - * these transfers, we might need this to give reasonable interrupt - * service time if the transfer size gets too large. - * * LINKED - if defined, linked commands are supported. * * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. @@ -1993,29 +1988,12 @@ static void NCR5380_information_transfer */ #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) - /* KLL - * PSEUDO_DMA is defined here. If this is the g_NCR5380 - * driver then it will always be defined, so the - * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base - * NCR5380 case. I think this is a fairly clean solution. - * We supplement these 2 if's with the flag. - */ -#ifdef NCR5380_dma_xfer_len - if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { -#else - transfersize = cmd->transfersize; + transfersize = 0; + if (!cmd->device->borken && + !(hostdata->flags & FLAG_NO_PSEUDO_DMA)) + transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); -#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ - if (transfersize > 512) - transfersize = 512; -#endif /* LIMIT_TRANSFERSIZE */ - - if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { - /* Limit transfers to 32K, for xx400 & xx406 - * pseudoDMA that transfers in 128 bytes blocks. */ - if (transfersize > 32 * 1024) - transfersize = 32 * 1024; -#endif + if (transfersize) { len = transfersize; if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { /* Index: linux/drivers/scsi/atari_NCR5380.c =================================================================== --- linux.orig/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:34.000000000 +1100 +++ linux/drivers/scsi/atari_NCR5380.c 2015-11-18 19:33:35.000000000 +1100 @@ -2164,11 +2164,13 @@ static void NCR5380_information_transfer */ #if defined(REAL_DMA) - if ( #if !defined(CONFIG_SUN3) - !cmd->device->borken && + transfersize = 0; + if (!cmd->device->borken) #endif - (transfersize = NCR5380_dma_xfer_len(instance, cmd, phase)) >= DMA_MIN_SIZE) { + transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); + + if (transfersize >= DMA_MIN_SIZE) { len = transfersize; cmd->SCp.phase = phase; if (NCR5380_transfer_dma(instance, &phase, Index: linux/drivers/scsi/dtc.c =================================================================== --- linux.orig/drivers/scsi/dtc.c 2015-11-18 19:33:27.000000000 +1100 +++ linux/drivers/scsi/dtc.c 2015-11-18 19:33:35.000000000 +1100 @@ -419,6 +419,20 @@ static inline int NCR5380_pwrite(struct return (0); } +static int dtc_dma_xfer_len(struct scsi_cmnd *cmd) +{ + int transfersize = cmd->transfersize; + + /* Limit transfers to 32K, for xx400 & xx406 + * pseudoDMA that transfers in 128 bytes blocks. + */ + if (transfersize > 32 * 1024 && cmd->SCp.this_residual && + !(cmd->SCp.this_residual % transfersize)) + transfersize = 32 * 1024; + + return transfersize; +} + MODULE_LICENSE("GPL"); #include "NCR5380.c" Index: linux/drivers/scsi/g_NCR5380.c =================================================================== --- linux.orig/drivers/scsi/g_NCR5380.c 2015-11-18 19:33:27.000000000 +1100 +++ linux/drivers/scsi/g_NCR5380.c 2015-11-18 19:33:35.000000000 +1100 @@ -701,6 +701,21 @@ static inline int NCR5380_pwrite(struct ; // TIMEOUT return 0; } + +static int generic_NCR5380_dma_xfer_len(struct scsi_cmnd *cmd) +{ + int transfersize = cmd->transfersize; + + /* Limit transfers to 32K, for xx400 & xx406 + * pseudoDMA that transfers in 128 bytes blocks. + */ + if (transfersize > 32 * 1024 && cmd->SCp.this_residual && + !(cmd->SCp.this_residual % transfersize)) + transfersize = 32 * 1024; + + return transfersize; +} + #endif /* PSEUDO_DMA */ /* Index: linux/drivers/scsi/g_NCR5380.h =================================================================== --- linux.orig/drivers/scsi/g_NCR5380.h 2015-11-18 19:33:12.000000000 +1100 +++ linux/drivers/scsi/g_NCR5380.h 2015-11-18 19:33:35.000000000 +1100 @@ -73,6 +73,9 @@ #endif +#define NCR5380_dma_xfer_len(instance, cmd, phase) \ + generic_NCR5380_dma_xfer_len(cmd) + #define NCR5380_intr generic_NCR5380_intr #define NCR5380_queue_command generic_NCR5380_queue_command #define NCR5380_abort generic_NCR5380_abort Index: linux/drivers/scsi/dtc.h =================================================================== --- linux.orig/drivers/scsi/dtc.h 2015-11-18 19:33:05.000000000 +1100 +++ linux/drivers/scsi/dtc.h 2015-11-18 19:33:35.000000000 +1100 @@ -27,6 +27,9 @@ #define NCR5380_read(reg) (readb(DTC_address(reg))) #define NCR5380_write(reg, value) (writeb(value, DTC_address(reg))) +#define NCR5380_dma_xfer_len(instance, cmd, phase) \ + dtc_dma_xfer_len(cmd) + #define NCR5380_intr dtc_intr #define NCR5380_queue_command dtc_queue_command #define NCR5380_abort dtc_abort Index: linux/drivers/scsi/arm/cumana_1.c =================================================================== --- linux.orig/drivers/scsi/arm/cumana_1.c 2015-11-18 19:33:27.000000000 +1100 +++ linux/drivers/scsi/arm/cumana_1.c 2015-11-18 19:33:35.000000000 +1100 @@ -22,6 +22,9 @@ #define priv(host) ((struct NCR5380_hostdata *)(host)->hostdata) #define NCR5380_read(reg) cumanascsi_read(instance, reg) #define NCR5380_write(reg, value) cumanascsi_write(instance, reg, value) + +#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize) + #define NCR5380_intr cumanascsi_intr #define NCR5380_queue_command cumanascsi_queue_command #define NCR5380_info cumanascsi_info Index: linux/drivers/scsi/arm/oak.c =================================================================== --- linux.orig/drivers/scsi/arm/oak.c 2015-11-18 19:33:27.000000000 +1100 +++ linux/drivers/scsi/arm/oak.c 2015-11-18 19:33:35.000000000 +1100 @@ -26,6 +26,8 @@ #define NCR5380_write(reg, value) \ writeb(value, priv(instance)->base + ((reg) << 2)) +#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize) + #define NCR5380_queue_command oakscsi_queue_command #define NCR5380_info oakscsi_info #define NCR5380_show_info oakscsi_show_info Index: linux/drivers/scsi/mac_scsi.c =================================================================== --- linux.orig/drivers/scsi/mac_scsi.c 2015-11-18 19:33:27.000000000 +1100 +++ linux/drivers/scsi/mac_scsi.c 2015-11-18 19:33:35.000000000 +1100 @@ -38,6 +38,7 @@ #define NCR5380_pread macscsi_pread #define NCR5380_pwrite macscsi_pwrite +#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize) #define NCR5380_intr macscsi_intr #define NCR5380_queue_command macscsi_queue_command Index: linux/drivers/scsi/pas16.h =================================================================== --- linux.orig/drivers/scsi/pas16.h 2015-11-18 19:33:05.000000000 +1100 +++ linux/drivers/scsi/pas16.h 2015-11-18 19:33:35.000000000 +1100 @@ -110,6 +110,8 @@ #define NCR5380_read(reg) ( inb(PAS16_io_port(reg)) ) #define NCR5380_write(reg, value) ( outb((value),PAS16_io_port(reg)) ) +#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize) + #define NCR5380_intr pas16_intr #define NCR5380_queue_command pas16_queue_command #define NCR5380_abort pas16_abort Index: linux/drivers/scsi/t128.h =================================================================== --- linux.orig/drivers/scsi/t128.h 2015-11-18 19:33:05.000000000 +1100 +++ linux/drivers/scsi/t128.h 2015-11-18 19:33:35.000000000 +1100 @@ -84,6 +84,8 @@ #define NCR5380_read(reg) readb(T128_address(reg)) #define NCR5380_write(reg, value) writeb((value),(T128_address(reg))) +#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize) + #define NCR5380_intr t128_intr #define NCR5380_queue_command t128_queue_command #define NCR5380_abort t128_abort -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/