kernel/drivers/hv, branch linux-5.1.y

Drivers: hv: vmbus: Remove the undesired put_cpu_ptr() in hv_synic_cleanup()

2019-05-11T05:49:53Z

commit a0033bd1eae4650b69be07c17cb87393da584563 upstream. With CONFIG_DEBUG_PREEMPT=y, the put_cpu_ptr() triggers an underflow warning in preempt_count_sub(). Fixes: 37cdd991fac8 ("vmbus: put related per-cpu variable together") Cc: stable@vger.kernel.org Cc: Stephen Hemminger Signed-off-by: Dexuan Cui Reviewed-by: Michael Kelley Signed-off-by: Sasha Levin (Microsoft) Signed-off-by: Greg Kroah-Hartman

Merge tag 'char-misc-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2019-03-06T22:18:59Z

Pull char/misc driver updates from Greg KH: "Here is the big char/misc driver patch pull request for 5.1-rc1. The largest thing by far is the new habanalabs driver for their AI accelerator chip. For now it is in the drivers/misc directory but will probably move to a new directory soon along with other drivers of this type. Other than that, just the usual set of individual driver updates and fixes. There's an "odd" merge in here from the DRM tree that they asked me to do as the MEI driver is starting to interact with the i915 driver, and it needed some coordination. All of those patches have been properly acked by the relevant subsystem maintainers. All of these have been in linux-next with no reported issues, most for quite some time" * tag 'char-misc-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (219 commits) habanalabs: adjust Kconfig to fix build errors habanalabs: use %px instead of %p in error print habanalabs: use do_div for 64-bit divisions intel_th: gth: Fix an off-by-one in output unassigning habanalabs: fix little-endian<->cpu conversion warnings habanalabs: use NULL to initialize array of pointers habanalabs: fix little-endian<->cpu conversion warnings habanalabs: soft-reset device if context-switch fails habanalabs: print pointer using %p habanalabs: fix memory leak with CBs with unaligned size habanalabs: return correct error code on MMU mapping failure habanalabs: add comments in uapi/misc/habanalabs.h habanalabs: extend QMAN0 job timeout habanalabs: set DMA0 completion to SOB 1007 habanalabs: fix validation of WREG32 to DMA completion habanalabs: fix mmu cache registers init habanalabs: disable CPU access on timeouts habanalabs: add MMU DRAM default page mapping habanalabs: Dissociate RAZWI info from event types misc/habanalabs: adjust Kconfig to fix build errors ...

hv_balloon: mark inflated pages PG_offline

2019-03-06T05:07:14Z

Mark inflated and never onlined pages PG_offline, to tell the world that the content is stale and should not be dumped. Link: http://lkml.kernel.org/r/20181119101616.8901-6-david@redhat.com Signed-off-by: David Hildenbrand Acked-by: Pankaj gupta Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: Kairui Song Cc: Vitaly Kuznetsov Cc: Matthew Wilcox Cc: Michal Hocko Cc: "Michael S. Tsirkin" Cc: Alexander Duyck Cc: Alexey Dobriyan Cc: Arnd Bergmann Cc: Baoquan He Cc: Borislav Petkov Cc: Boris Ostrovsky Cc: Christian Hansen Cc: Dave Young Cc: David Rientjes Cc: Greg Kroah-Hartman Cc: Jonathan Corbet Cc: Juergen Gross Cc: Julien Freche Cc: Kazuhito Hagio Cc: "Kirill A. Shutemov" Cc: Konstantin Khlebnikov Cc: Len Brown Cc: Lianbo Jiang Cc: Michal Hocko Cc: Mike Rapoport Cc: Miles Chen Cc: Nadav Amit Cc: Naoya Horiguchi Cc: Omar Sandoval Cc: Pavel Machek Cc: Pavel Tatashin Cc: Rafael J. Wysocki Cc: "Rafael J. Wysocki" Cc: Stefano Stabellini Cc: Stephen Rothwell Cc: Vlastimil Babka Cc: Xavier Deguillard Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm/page_alloc.c: memory hotplug: free pages as higher order

2019-03-06T05:07:14Z

When freeing pages are done with higher order, time spent on coalescing pages by buddy allocator can be reduced. With section size of 256MB, hot add latency of a single section shows improvement from 50-60 ms to less than 1 ms, hence improving the hot add latency by 60 times. Modify external providers of online callback to align with the change. [arunks@codeaurora.org: v11] Link: http://lkml.kernel.org/r/1547792588-18032-1-git-send-email-arunks@codeaurora.org [akpm@linux-foundation.org: remove unused local, per Arun] [akpm@linux-foundation.org: avoid return of void-returning __free_pages_core(), per Oscar] [akpm@linux-foundation.org: fix it for mm-convert-totalram_pages-and-totalhigh_pages-variables-to-atomic.patch] [arunks@codeaurora.org: v8] Link: http://lkml.kernel.org/r/1547032395-24582-1-git-send-email-arunks@codeaurora.org [arunks@codeaurora.org: v9] Link: http://lkml.kernel.org/r/1547098543-26452-1-git-send-email-arunks@codeaurora.org Link: http://lkml.kernel.org/r/1538727006-5727-1-git-send-email-arunks@codeaurora.org Signed-off-by: Arun KS Reviewed-by: Andrew Morton Acked-by: Michal Hocko Reviewed-by: Oscar Salvador Reviewed-by: Alexander Duyck Cc: K. Y. Srinivasan Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Dan Williams Cc: Vlastimil Babka Cc: Joonsoo Kim Cc: Greg Kroah-Hartman Cc: Mathieu Malaterre Cc: "Kirill A. Shutemov" Cc: Souptick Joarder Cc: Mel Gorman Cc: Aaron Lu Cc: Srivatsa Vaddagiri Cc: Vinayak Menon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge tag 'hyperv-next-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux into char-misc-next

2019-03-01T15:43:50Z

Sasha writes: 1. Exopsing counters for state changes of channel ring buffers; this is useful to investigate performance issues. By Kimberly Brown. 2. Switching to the new generic UUID API, by Andy Shevchenko. * tag 'hyperv-next-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: Drivers: hv: vmbus: Expose counters for interrupts and full conditions vmbus: Switch to use new generic UUID API

Drivers: hv: vmbus: Change server monitor_pages index to 0

2019-02-23T08:57:55Z

Change the monitor_pages index in server_monitor_pending_show() to '0'. '0' is the correct monitor_pages index for the server. A comment for the monitor_pages field in the vmbus_connection struct definition indicates that the 1st page is for parent->child notifications. In addition, the server_monitor_latency_show() and server_monitor_conn_id_show() functions use monitor_pages index '0'. Signed-off-by: Kimberly Brown Acked-by: Stephen Hemminger Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

Drivers: hv: vmbus: Expose counters for interrupts and full conditions

2019-02-15T01:56:10Z

Counter values for per-channel interrupts and ring buffer full conditions are useful for investigating performance. Expose counters in sysfs for 2 types of guest to host interrupts: 1) Interrupts caused by the channel's outbound ring buffer transitioning from empty to not empty 2) Interrupts caused by the channel's inbound ring buffer transitioning from full to not full while a packet is waiting for enough buffer space to become available Expose 2 counters in sysfs for the number of times that write operations encountered a full outbound ring buffer: 1) The total number of write operations that encountered a full condition 2) The number of write operations that were the first to encounter a full condition Increment the outbound full condition counters in the hv_ringbuffer_write() function because, for most drivers, a full outbound ring buffer is detected in that function. Also increment the outbound full condition counters in the set_channel_pending_send_size() function. In the hv_sock driver, a full outbound ring buffer is detected and set_channel_pending_send_size() is called before hv_ringbuffer_write() is called. I tested this patch by confirming that the sysfs files were created and observing the counter values. The values seemed to increase by a reasonable amount when the Hyper-v related drivers were in use. Signed-off-by: Kimberly Brown Reviewed-by: Michael Kelley Signed-off-by: Sasha Levin

vmbus: Switch to use new generic UUID API

2019-02-15T01:45:23Z

There are new types and helpers that are supposed to be used in new code. As a preparation to get rid of legacy types and API functions do the conversion here. Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: devel@linuxdriverproject.org Signed-off-by: Andy Shevchenko Reviewed-by: Michael Kelley Reviewed-by: Christoph Hellwig Signed-off-by: Sasha Levin

vmbus: fix subchannel removal

2019-01-10T00:20:31Z

The changes to split ring allocation from open/close, broke the cleanup of subchannels. This resulted in problems using uio on network devices because the subchannel was left behind when the network device was unbound. The cause was in the disconnect logic which used list splice to move the subchannel list into a local variable. This won't work because the subchannel list is needed later during the process of the rescind messages (relid2channel). The fix is to just leave the subchannel list in place which is what the original code did. The list is cleaned up later when the host rescind is processed. Without the fix, we have a lot of "hang" issues in netvsc when we try to change the NIC's MTU, set the number of channels, etc. Fixes: ae6935ed7d42 ("vmbus: split ring buffer allocation from open") Cc: stable@vger.kernel.org Signed-off-by: Stephen Hemminger Signed-off-by: Dexuan Cui Signed-off-by: Sasha Levin

hv_balloon: avoid touching uninitialized struct page during tail onlining

2019-01-09T19:20:47Z

Hyper-V memory hotplug protocol has 2M granularity and in Linux x86 we use 128M. To deal with it we implement partial section onlining by registering custom page onlining callback (hv_online_page()). Later, when more memory arrives we try to online the 'tail' (see hv_bring_pgs_online()). It was found that in some cases this 'tail' onlining causes issues: BUG: Bad page state in process kworker/0:2 pfn:109e3a page:ffffe08344278e80 count:0 mapcount:1 mapping:0000000000000000 index:0x0 flags: 0xfffff80000000() raw: 000fffff80000000 dead000000000100 dead000000000200 0000000000000000 raw: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 page dumped because: nonzero mapcount ... Workqueue: events hot_add_req [hv_balloon] Call Trace: dump_stack+0x5c/0x80 bad_page.cold.112+0x7f/0xb2 free_pcppages_bulk+0x4b8/0x690 free_unref_page+0x54/0x70 hv_page_online_one+0x5c/0x80 [hv_balloon] hot_add_req.cold.24+0x182/0x835 [hv_balloon] ... Turns out that we now have deferred struct page initialization for memory hotplug so e.g. memory_block_action() in drivers/base/memory.c does pages_correctly_probed() check and in that check it avoids inspecting struct pages and checks sections instead. But in Hyper-V balloon driver we do PageReserved(pfn_to_page()) check and this is now wrong. Switch to checking online_section_nr() instead. Signed-off-by: Vitaly Kuznetsov Cc: stable@kernel.org Signed-off-by: Sasha Levin