- Sep 26, 2018
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Stephen Hemminger authored
The UIO driver needs the ring buffer to be persistent(reused) across open/close. Split the allocation and setup of ring buffer out of vmbus_open. For normal usage vmbus_open/vmbus_close there are no changes; only impacts uio_hv_generic which needs to keep ring buffer memory and reuse when application restarts. Signed-off-by:
Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Stephen Hemminger authored
Avoid going from struct page to virt address (and back) by just keeping pointer to the allocated pages instead of virt address. Signed-off-by:
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Stephen Hemminger authored
Rather than passing relid and then looking up the channel. Pass the channel directly, since caller already knows it. Signed-off-by:
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Roman Kiryanov authored
No symbols were used from this header. Signed-off-by:
Roman Kiryanov <rkir@google.com> Signed-off-by:
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Roman Kiryanov authored
goldfish_pipe_command is defines just after declaration and nothing refers to goldfish_pipe before it is defined. Signed-off-by:
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Roman Kiryanov authored
The blank line is not required there. Signed-off-by:
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Roman Kiryanov authored
platform: goldfish: pipe: Prevent memory corruption from several threads writing to the same variable Move the "pages" buffer into "struct goldfish_pipe". Since we are locking the mutex on the pipe in transfer_max_buffers, other threads willnot be able to write into it, but other pipe instances could be served because they have its own buffer. Signed-off-by:
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Roman Kiryanov authored
The boilerplate license is not necessary when the SPDX line is present. Signed-off-by:
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Suzuki K Poulose authored
Use CLAIM tags to make sure the device is available for use. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by:
Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by:
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zhong jiang authored
module.h has duplicated include. hence just remove redundant include file. Signed-off-by:
zhong jiang <zhongjiang@huawei.com> Signed-off-by:
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zhong jiang authored
The function should return -EFAULT when copy_from_user fails. Even though the caller does not distinguish them. but we should keep backward compatibility. Signed-off-by:
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Nathan Chancellor authored
Clang warns when a variable is assigned to itself. drivers/misc/mic/scif/scif_dma.c:1577:12: warning: explicitly assigning value of variable of type 'bool' (aka '_Bool') to itself [-Wself-assign] dst_local = dst_local; ~~~~~~~~~ ^ ~~~~~~~~~ 1 warning generated. This is usually done to avoid an unused variable warning, which is the case here. dst_local is used nowhere in this function, which has been the case since the initial code drop in commit 7cc31cd2 ("misc: mic: SCIF DMA and CPU copy interface") in 2015. Just remove the variable, it can be added back if it was intended to be used. Link: https://github.com/ClangBuiltLinux/linux/issues/107 Signed-off-by:Nathan Chancellor <natechancellor@gmail.com> Signed-off-by:
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zhong jiang authored
module.h already contains moduleparam.h, so it is safe to remove the redundant include. The issue is detected with the help of Coccinelle. Signed-off-by:
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Laura Abbott authored
kgdbts current fails when compiled with restrict: drivers/misc/kgdbts.c: In function ‘configure_kgdbts’: drivers/misc/kgdbts.c:1070:2: error: ‘strcpy’ source argument is the same as destination [-Werror=restrict] strcpy(config, opt); ^~~~~~~~~~~~~~~~~~~ As the error says, config is being used in both the source and destination. Refactor the code to avoid the extra copy and put the parsing closer to the actual location. Signed-off-by:
Laura Abbott <labbott@redhat.com> Acked-by:
Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by:
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Nathan Chancellor authored
Clang warns when multiple pairs of parentheses are used for a single conditional statement. drivers/misc/echo/echo.c:384:27: warning: equality comparison with extraneous parentheses [-Wparentheses-equality] if ((ec->nonupdate_dwell == 0)) { ~~~~~~~~~~~~~~~~~~~~^~~~ drivers/misc/echo/echo.c:384:27: note: remove extraneous parentheses around the comparison to silence this warning if ((ec->nonupdate_dwell == 0)) { ~ ^ ~ drivers/misc/echo/echo.c:384:27: note: use '=' to turn this equality comparison into an assignment if ((ec->nonupdate_dwell == 0)) { ^~ = 1 warning generated. Remove them and while we're at it, simplify the zero check as '!var' is used more than 'var == 0'. Reported-by:Nick Desaulniers <ndesaulniers@google.com> Signed-off-by:
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Srinivas Kandagatla authored
This patch adds support to uevent to help automatic module loading. Signed-off-by:
Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by:
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Srinivas Kandagatla authored
device status update can be racy with probe in some cases, so make sure it take lock during the probe. Also after probe the device is expected to be ready for communications, so make sure that a logical address can be assigned to it after probe. If it fails to do so then probe defer such instances. Signed-off-by:
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Srinivas Kandagatla authored
device_id for device tree based devices come from dt compatible string, such drivers need not provide non dt style device id table. Match those device using compatible strings. Signed-off-by:
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Srinivas Kandagatla authored
Validate logical address assigned by remote, in failure cases this value is all zeors. Signed-off-by:
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Srinivas Kandagatla authored
Register slimbus controller only after finishing powerup sequnce so that we do not endup in situation where core starts sending transactions before the controller is ready. Signed-off-by:
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Srinivas Kandagatla authored
It looks like there is a typo in probe return. Fix it. Signed-off-by:
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Srinivas Kandagatla authored
Move ngd platform driver out of loop so that it registers only once. Signed-off-by:
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zhong jiang authored
of_node_put has taken the null pinter check into account. So it is safe to remove the duplicated check before of_node_put. Signed-off-by:
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Colin Ian King authored
Trivial fix to spelling mistake in comment Signed-off-by:
Colin Ian King <colin.king@canonical.com> Reviewed-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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Nadav Amit authored
It is useful to expose how many times the balloon resets. If it happens more than very rarely - this is an indication for a problem. Reviewed-by:
Xavier Deguillard <xdeguillard@vmware.com> Signed-off-by:
Nadav Amit <namit@vmware.com> Signed-off-by:
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Nadav Amit authored
Change all the remaining return values to int to avoid mistakes. Reduce indentation when possible. Reviewed-by:
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Nadav Amit authored
In preparation for supporting compaction and OOM notification, this patch reworks the inflate/deflate loops. The main idea is to separate the allocation, communication with the hypervisor, and the handling of errors from each other. Doing will allow us to perform concurrent inflation and deflation, excluding the actual communication with the hypervisor. To do so, we need to get rid of the remaining global state that is kept in the balloon struct, specifically the refuse_list. When the VM communicates with the hypervisor, it does not free or put back pages to the balloon list and instead only moves the pages whose status indicated failure into a refuse_list on the stack. Once the operation completes, the inflation or deflation functions handle the list appropriately. As we do that, we can consolidate the communication with the hypervisor for both the lock and unlock operations into a single function. We also reuse the deflation function for popping the balloon. As a preparation for preventing races, we hold a spinlock when the communication actually takes place, and use atomic operations for updating the balloon size. The balloon page list is still racy and will be handled in the next patch. Reviewed-by:
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Nadav Amit authored
To allow the balloon statistics to be updated concurrently, we change the statistics to be held per core and aggregate it when needed. To avoid the memory overhead of keeping the statistics per core, and since it is likely not used by most users, we start updating the statistics only after the first use. A read-write semaphore is used to protect the statistics initialization and avoid races. This semaphore is (and will) be used to protect configuration changes during reset. While we are at it, address some other issues: change the statistics update to inline functions instead of define; use ulong for saving the statistics; and clean the statistics printouts. Note that this patch changes the format of the outputs. If there are any automatic tools that use the statistics, they might fail. Reviewed-by:
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Nadav Amit authored
As we want to leave as little as possible on the global balloon structure, to avoid possible future races, we want to get rid sysinfo. We can actually get the total_ram directly, and simplify the logic of vmballoon_send_get_target() a little. While we are doing that, let's return int and avoid mistakes due to bool/int conversions. Reviewed-by:
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Nadav Amit authored
The required change in the balloon size is currently computed in vmballoon_work(), vmballoon_inflate() and vmballoon_deflate(). Refactor it to simplify the next patches. Reviewed-by:
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Nadav Amit authored
The name of the macro'd VMW_BALLOON_2M_SHIFT is misleading. The value reflects 2M huge-page order. Unfortunately, we cannot use HPAGE_PMD_ORDER, since it is not defined when transparent huge-pages are off, so we need to define our own one. Rename it to VMW_BALLOON_2M_ORDER. No functional change. Signed-off-by:
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Nadav Amit authored
Currently, when the hypervisor rejects a page during lock operation, the VM treats pages differently according to the error-code: in certain cases the page is immediately freed, and in others it is put on a rejection list and only freed later. The behavior does not make too much sense. If the page is freed immediately it is very likely to be used again in the next batch of allocations, and be rejected again. In addition, for support of compaction and OOM notifiers, we wish to separate the logic that communicates with the hypervisor (as well as analyzes the status of each page) from the logic that allocates or free pages. Treat all errors the same way, queuing the pages on the refuse list. Move to the next allocation size (4k) when too many pages are refused. Free the refused pages when moving to the next size to avoid situations in which too much memory is waiting to be freed on the refused list. Reviewed-by:
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Nadav Amit authored
The current abstractions for batch vs single operations seem suboptimal and complicate the implementation of additional features (OOM, compaction). The immediate problem of the current abstractions is that they cause differences in how operations are handled when batching is on or off. For example, the refused_alloc counter is not updated when batching is on. These discrepancies are caused by code redundancies. Instead, this patch presents three type of operations, according to whether batching is on or off: (1) add page, (2) communication with the hypervisor and (3) retrieving the status of a page. To avoid the overhead of virtual functions, and since we do not expect additional interfaces for communication with the hypervisor, we use static keys instead of virtual functions. Finally, while we are at it, change vmballoon_init_batching() to return int instead of bool, to be consistent in the return type and avoid potential coding errors. Reviewed-by:
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Nadav Amit authored
Splitting the allocations between sleeping and non-sleeping made some sort of sense as long as rate-limiting was enabled. Now that it is removed, we need to decide - either we want sleeping allocations or not. Since no other Linux balloon driver (hv, Xen, virtio) uses sleeping allocations, use the same approach. We do distinguish, however, between 2MB allocations and 4kB allocations and prevent reclamation on 2MB. In both cases, we avoid using emergency low-memory pools, as it may cause undesired effects. Reviewed-by:
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Nadav Amit authored
The use of accessors for batch entries complicates the code and makes it less readable. Remove it an instead use bit-fields. Reviewed-by:
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Nadav Amit authored
The lock and unlock code paths are very similar, so avoid the duplicate code by merging them together. Reviewed-by:
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Nadav Amit authored
Now that we have a single point, unify the tracing and collecting the statistics for commands and their failure. While it might somewhat reduce the control over debugging, it cleans the code a lot. Reviewed-by:
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Nadav Amit authored
By inlining the hypercall interface, we can unify several operations into one central point in the code: - Updating the target. - Updating when a reset is needed. - Update statistics (which will be done later in the patch-set). - Print debug-messages (although they cannot be enabled as selectively). Reviewed-by:
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zhong jiang authored
of_node_put and put_device has taken the null pointer check into account. So it is safe to remove the duplicated check. Signed-off-by:
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Suzuki K Poulose authored
While we updated the coresight DT bindings, some of the new examples were not updated due to the order in which they were merged. Let us update all the missed out ones to the new bindings to avoid confusion. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Rob Herring <robh@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Signed-off-by:
Rob Herring <robh@kernel.org> Signed-off-by:
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