- 08 Jan, 2016 2 commits
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Insu Yun authored
Return value of snprintf is not bound by size value, 2nd argument. (https://www.kernel.org/doc/htmldocs/kernel-api/API-snprintf.html). Return value is number of printed chars, can be larger than 2nd argument. Therefore, it can write null byte out of bounds ofbuffer. Since snprintf puts null, it does not need to put additional null byte. Signed-off-by:
Insu Yun <wuninsu@gmail.com> Reviewed-by:
Shane Seymour <shane.seymour@hpe.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com>
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Mike Christie authored
Another iscsi target that cannot handle large IOs, but does not tell us a limit. The Synology iSCSI targets report: Block limits VPD page (SBC): Write same no zero (WSNZ): 0 Maximum compare and write length: 0 blocks Optimal transfer length granularity: 0 blocks Maximum transfer length: 0 blocks Optimal transfer length: 0 blocks Maximum prefetch length: 0 blocks Maximum unmap LBA count: 0 Maximum unmap block descriptor count: 0 Optimal unmap granularity: 0 Unmap granularity alignment valid: 0 Unmap granularity alignment: 0 Maximum write same length: 0x0 blocks and the size of the command it can handle seems to depend on how much memory it can allocate at the time. This results in IO errors when handling large IOs. This patch just has us use the old 1024 default sectors for this target by adding it to the scsi blacklist. We do not have good contacs with this vendors, so I have not been able to try and fix on their side. I have posted this a long while back, but it was not merged. This version just fixes it up for merge/patch failures in the original version. Reported-by:
Ancoron Luciferis <ancoron.luciferis@googlemail.com> Reported-by:
Michael Meyers <steltek@tcnnet.com> Signed-off-by:
Mike Christie <mchristi@redhat.com> Signed-off-by:
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- 07 Jan, 2016 38 commits
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Ondrej Zary authored
HP C2502 cards (based on 53C400A chips) use different magic numbers for software-based I/O address configuration than other cards. The configuration is also extended to allow setting the IRQ. Move the configuration to a new function magic_configure() and move magic the magic numbers into an array. Add new magic numbers for these HP cards and hp_c2502 module parameter to use them, e.g.: modprobe g_NCR5380 ncr_irq=7 ncr_addr=0x280 hp_c2502=1 Tested with HP C2502 and DTCT-436P. Signed-off-by:
Ondrej Zary <linux@rainbow-software.org> Signed-off-by:
Finn Thain <fthain@telegraphics.com.au> Reviewed-by:
Hannes Reinecke <hare@suse.com> Signed-off-by:
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Ondrej Zary authored
The check for 53C80 registers accessibility was commented out because it was broken (inverted). Fix and enable it. Signed-off-by:
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Ondrej Zary authored
Add I/O register mapping for DTC chips and enable PDMA mode. These chips have 16-bit wide HOST BUFFER register and it must be read by 16-bit accesses (we lose data otherwise). Large PIO transfers crash at least the DTCT-436P chip (all reads result in 0xFF) so this patch actually makes it work. The chip also crashes when we bang on the C400 host status register too heavily after PDMA write - a small udelay is needed. Tested on DTCT-436P and verified that it does not break 53C400A. Signed-off-by:
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Ondrej Zary authored
Add I/O register mapping for NCR53C400A and enable PDMA mode to improve performance and fix non-working IRQ. Tested with HP C2502 (and user-space enabler). Signed-off-by:
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Ondrej Zary authored
Convert compile-time C400_ register mapping to runtime mapping. This removes the weird negative register offsets and allows adding additional mappings. While at it, convert read/write loops into insb/outsb. Signed-off-by:
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Ondrej Zary authored
Pseudo-DMA (PDMA) has been broken for ages, resulting in hangs on 53C400-based cards. According to 53C400 datasheet, PDMA transfer length must be a multiple of 128. Check if that's true and use PIO if it's not. This makes PDMA work on 53C400 (Canon FG2-5202). Signed-off-by:
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Finn Thain authored
Signed-off-by:
Michael Schmitz <schmitzmic@gmail.com> Signed-off-by:
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Finn Thain authored
In the past, atari_NCR5380.c was overlooked by those working on NCR5380.c and this caused needless divergence. All of the changes in this patch were taken from NCR5380.c. This removes some unimportant discrepancies between the two core driver forks so that 'diff' can be used to reveal the important ones, to facilitate reunification. Signed-off-by:
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Finn Thain authored
In the past, NCR5380.c was overlooked by those working on atari_NCR5380.c and this caused needless divergence. All of the changes in this patch were taken from atari_NCR5380.c. This removes some unimportant discrepancies between the two core driver forks so that 'diff' can be used to reveal the important ones, to facilitate reunification. Signed-off-by:
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Finn Thain authored
Hanging indentation was a poor choice for the text inside comments. It has been used in the wrong places and done badly elsewhere. There is little consistency within any file. One fork of the core driver uses tabs for this indentation while the other uses spaces. Better to use flush-left alignment throughout. This patch is the result of the following substitution. It replaces tabs and spaces at the start of a comment line with a single space. perl -i -pe 's,^(\t*[/ ]\*)[ \t]+,$1 ,' drivers/scsi/{atari_,}NCR5380.c This removes some unimportant discrepancies between the two core driver forks so that the important ones become obvious, to facilitate reunification. Signed-off-by: -
Finn Thain authored
This patch is the result of the following substitution. It removes any tabs and spaces at the end of a line. perl -i -pe 's,[\t ]+$,,' drivers/scsi/{atari_,}NCR5380.c This removes some unimportant discrepancies between the two core driver forks so that the important ones become obvious, to facilitate reunification. Signed-off-by: -
Finn Thain authored
The CVS revision log is not nearly as useful as the history/history.git repo, so remove it. Roman's commentary at the top of his driver repeats the same information elsewhere in the file so remove it. Also remove some other redundant or obsolete comments. Both the driver and the datasheets confusingly refer to a DMA access for a SCSI WRITE command as a "DMA write". Similarly a SCSI READ command is called a "DMA read". This is the opposite of the usual convention. Thankfully, the chip documentation and driver code also use "DMA send" and "DMA receive", so adopt this terminology. This removes some unimportant discrepancies between the two core driver forks so that 'diff' can be used to reveal the important ones, to facilitate reunification. Signed-off-by:
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Finn Thain authored
Because of the rudimentary design of the chip, it is necessary to poll the SCSI bus signals during PIO and this tends to hog the CPU. The driver will accept new commands while others execute, and this causes a soft lockup because the workqueue item will not terminate until the issue queue is emptied. When exercising dmx3191d using sequential IO from dd, the driver is sent 512 KiB WRITE commands and 128 KiB READs. For a PIO transfer, the rate is is only about 300 KiB/s, so these are long-running commands. And although PDMA may run at several MiB/s, interrupts are disabled for the duration of the transfer. Fix the unresponsiveness and soft lockup issues by calling cond_resched() after each command is completed and by limiting max_sectors for drivers that don't implement real DMA. Signed-off-by:
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Finn Thain authored
This refactoring removes two global Scsi_Host pointers. This improves consistency with other ncr5380 drivers. Adopting the same conventions as the other drivers makes them easier to read. Signed-off-by:
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Finn Thain authored
Keep the two core driver forks in sync. Signed-off-by:
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Finn Thain authored
Remove the HOSTNO macro that is peculiar to atari_NCR5380.c and contributes to the problem of divergence of the NCR5380 core drivers. Keep NCR5380.c in sync. Signed-off-by:
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Finn Thain authored
NCR5380.c lacks a sane eh_bus_reset_handler. The atari_NCR5380.c code is much better but it should not throw out the issue queue (that would be a host reset) and it neglects to set the result code for commands that it throws out. Fix these bugs and keep the two core drivers in sync. Signed-off-by:
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Finn Thain authored
During arbitration and selection, the relevant command is invisible to exception handlers and can be found only in a pointer on the stack of a different thread. When eh_abort_handler can't find a given command, it can't decide whether that command was completed already or is still in arbitration or selection phase. But it must return either SUCCESS (e.g. command completed earlier) or FAILED (could not abort the nexus, try bus reset). The solution is to make sure all commands belonging to the LLD are always visible to exception handlers. Add another scsi_cmnd pointer to the hostdata struct to track the command in arbitration or selection phase. Replace 'retain_dma_irq' with the new 'selecting' pointer, to bring atari_NCR5380.c into line with NCR5380.c. Signed-off-by:
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Finn Thain authored
Introduce a new eh_abort_handler implementation. This one attempts to follow all of the rules relating to EH handlers. There is still a known bug: during selection, a command becomes invisible to the EH handlers because it only appears in a pointer on the stack of a different thread. This bug is addressed in a subsequent patch. Signed-off-by:
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Finn Thain authored
NCR5380_information_transfer() may re-queue a command for autosense, after calling scsi_eh_prep_cmnd(). This creates several possibilities: 1. Reselection may intervene before the re-queued command gets processed. If the reconnected command then undergoes autosense, this causes the scsi_eh_save data from the previous command to be overwritten. 2. After NCR5380_information_transfer() calls scsi_eh_prep_cmnd(), a new REQUEST SENSE command may arrive. This would be queued ahead of any command already undergoing autosense, which means the scsi_eh_save data might be restored to the wrong command. 3. After NCR5380_information_transfer() calls scsi_eh_prep_cmnd(), eh_abort_handler() may abort the command. But the scsi_eh_save data is not discarded, which means the scsi_eh_save data might be incorrectly restored to the next REQUEST SENSE command issued. This patch adds a new autosense list so that commands that are re-queued because of a CHECK CONDITION result can be kept apart from the REQUEST SENSE commands that arrive via queuecommand. This patch also adds a function dedicated to dequeueing and preparing the next command for processing. By refactoring the main loop in this way, scsi_eh_save takes place when an autosense command is dequeued rather than when re-queued. Signed-off-by:
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Finn Thain authored
Implement a 'complete_cmd' function to complete commands. This is needed by the following patch; the new function provides a site for the logic needed to correctly handle REQUEST SENSE commands. Signed-off-by:
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Finn Thain authored
The NCR5380 drivers have a home-spun linked list implementation for scsi_cmnd structs that uses cmd->host_scribble as a 'next' pointer. Adopt the standard list_head data structure and list operations instead. Remove the eh_abort_handler rather than convert it. Doing the conversion would only be churn because the existing EH handlers don't work and get replaced in a subsequent patch. Signed-off-by:
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Finn Thain authored
The hostdata struct is now protected by a spin lock so the volatile qualifiers are redundant. Remove them. Signed-off-by:
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Finn Thain authored
Printing command pointers can be useful when debugging queues. Other than that, the LIST and REMOVE macros are just clutter. These macros are redundant now that NDEBUG_QUEUES causes pointers to be printed, so remove them. Signed-off-by:
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Finn Thain authored
Print the command pointers in the log messages for debugging queue data structures. The LIST and REMOVE macros can then be removed. Signed-off-by:
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Finn Thain authored
Make use of the shost_priv() helper. Remove HOSTDATA and SETUP_HOSTDATA macros because they harm readability. Signed-off-by:
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Finn Thain authored
Replace all H_NO and some HOSTNO macros (both peculiar to atari_NCR5380.c) with a new dsprintk macro that's more useful and more consistent. The new macro avoids a lot of boilerplate in new code in subsequent patches. Keep NCR5380.c in sync. Remaining HOSTNO macros are removed as side-effects of subsequent patches. Signed-off-by:
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Finn Thain authored
Some NCR5380 hosts offer a .show_info method to access the contents of the various command list data structures from a procfs file. When NDEBUG is set, the same information is sent to the console during EH. The two core drivers, atari_NCR5380.c and NCR5380.c differ here. Because it is just for debugging, the easiest way to fix the discrepancy is simply remove this code. The only remaining users of NCR5380_show_info() and NCR5380_write_info() are drivers that define PSEUDO_DMA. The others have no use for the .show_info method, so don't initialize it. Signed-off-by:
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Finn Thain authored
NCR5380.c presently uses the instance->host_lock spin lock. Convert this to a new spin lock that protects the NCR5380_hostdata struct. atari_NCR5380.c previously used local_irq_save/restore() rather than a spin lock. Convert this to hostdata->lock in irq mode. For SMP platforms, the interrupt handler now also acquires the spin lock. This brings all locking in the two core drivers into agreement. Adding this locking also means that a bunch of volatile qualifiers can be removed from the members of the NCR5380_hostdata struct. This is done in a subsequent patch. Proper locking will allow the abort handler to locate a command being aborted. This is presently impossible if the abort handler is invoked when the command has been moved from a queue to a pointer on the stack. (If eh_abort_handler can't determine whether a command has been completed or is still being processed then it can't decide whether to return success or failure.) The hostdata spin lock is now held when calling NCR5380_select() and NCR5380_information_transfer(). Where possible, the lock is dropped for polling and PIO transfers. Clean up the now-redundant SELECT_ENABLE_REG writes, that used to provide limited mutual exclusion between information_transfer() and reselect(). Accessing hostdata->connected without data races means taking the lock; cleanup these accesses. The new spin lock falls away for m68k and other UP builds, so this should have little impact there. In the SMP case the new lock should be uncontested even when the SCSI bus is contested. Signed-off-by:
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Finn Thain authored
Remove FLAG_DTC3181E. It was used to suppress a final Arbitration Lost (SEL asserted) test that isn't actually needed. The test was suppressed because it causes problems for DTC436 and DTC536 chips. It takes place after the host wins arbitration, so SEL has been asserted. These chips can't seem to tell whether it was the host or another bus device that did so. This questionable final test appears in a flow chart in an early NCR5380 datasheet. It was removed from later documents like the DP5380 datasheet. By the time this final test takes place, the driver has already tested the Arbitration Lost bit several times. The first test happens 3 us after BUS FREE (or longer due to register access delays). The protocol requires that a device stop signalling within 1.8 us after BUS FREE unless it won arbitration, in which case it must assert SEL, which is detected 1.2 us later by the first Arbitration Lost test. Signed-off-by:
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Finn Thain authored
When a target reports a QUEUE_FULL condition it causes the driver to update the 'queue_size' limit with the number of currently allocated tags. At least, that's what's supposed to happen, according to the comments. Unfortunately the terms in the assignment are swapped. Fix this and cleanup some obsolete comments. Signed-off-by:
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Finn Thain authored
Add missing .module initializer. Use distinct .proc_name values for the g_NCR5380 and g_NCR5380_mmio modules. Remove pointless CAN_QUEUE and CMD_PER_LUN override macros. Cleanup whitespace and code style. Signed-off-by:
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Finn Thain authored
NDEBUG_NO_DATAOUT should not disable DATA IN phases too. Fix this. (This bug has long been fixed in atari_NCR5380.c.) Signed-off-by:
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Finn Thain authored
Remove unused includes (stat.h, signal.h, proc_fs.h) and move includes needed by the core drivers into the common header (delay.h etc). Signed-off-by:
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Finn Thain authored
Fix the array bounds check when transferring an extended message from the target. Signed-off-by:
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Finn Thain authored
Bring the two NCR5380_reselect() implementations into agreement. Replace infinite loops in atari_NCR5380.c with timeouts, as per NCR5380.c. Remove 'abort' flag in NCR5380.c as per atari_NCR5380.c -- if reselection fails, there may be no MESSAGE IN phase so don't attempt data transfer. During selection, don't interfere with the chip registers after a reselection interrupt intervenes. Clean up some trivial issues with code style, comments and printk. Signed-off-by:
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Finn Thain authored
The workarounds for chip errata appear twice, in slightly different forms. One is used when defined(REAL_DMA) || defined(REAL_DMA_POLL), the other when defined(PSEUDO_DMA). In the PDMA case, the workarounds have been made conditional on FLAG_NO_DMA_FIXUPS. Do the same for the DMA case, to eliminate the READ_OVERRUNS macro. Signed-off-by:
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Finn Thain authored
The flags DMA_WORKS_RIGHT, FLAG_NCR53C400 and FLAG_HAS_LAST_BYTE_SENT all mean the same thing, i.e. the chip is not a 538[01]. (More recent devices such as the 53C80 have a 'Last Byte Sent' bit in the Target Command Register as well as other fixes for End-of-DMA errata.) These flags have no additional meanings since previous cleanup patches eliminated the NCR53C400 macro, moved g_NCR5380-specific code out of the core driver and standardized interrupt handling. Use the FLAG_NO_DMA_FIXUP flag to suppress End-of-DMA errata workarounds, for those cards and drivers that make use of the TCR_LAST_BYTE_SENT bit. Remove the old flags. Signed-off-by:
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