user/sven/linux.git/drivers/ntb, branch v5.3.1

NTB/msi: remove incorrect MODULE defines

2019-08-05T19:42:27Z

msi.c is not a module on its own right and should not have the MODULE_[LICENSE|VERSION|AUTHOR|DESCRIPTION] definitions. This caused a regression noticed by lkp with the following back trace: WARNING: CPU: 0 PID: 1 at kernel/params.c:861 param_sysfs_init+0xb1/0x20a Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.2.0-rc1-00018-g26b3a37b928457 #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 RIP: 0010:param_sysfs_init+0xb1/0x20a Code: 24 38 e8 ec 17 2e fd 49 8b 7c 24 38 e8 76 fe ff ff 48 85 c0 48 89 c5 74 25 31 d2 4c 89 e6 48 89 c7 e8 6d 6f 3c fd 85 c0 74 02 <0f> 0b 48 89 ef 31 f6 e8 5d 70 a7 fe 48 89 ef e8 95 52 a7 fe 48 83 RSP: 0000:ffff88806b0ffe30 EFLAGS: 00010282 RAX: 00000000ffffffef RBX: ffffffff83774220 RCX: ffff88806a85e880 RDX: 00000000ffffffef RSI: ffff88806b000400 RDI: ffff88806a8608c0 RBP: ffff88806b392000 R08: ffffed100d61ff59 R09: ffffed100d61ff59 R10: 0000000000000001 R11: ffffed100d61ff58 R12: ffffffff83974bc0 R13: 0000000000000004 R14: 0000000000000028 R15: 00000000000003b9 FS: 0000000000000000(0000) GS:ffff88806b800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000380e000 CR4: 00000000000406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? file_caps_disable+0x10/0x10 ? locate_module_kobject+0xf2/0xf2 do_one_initcall+0x47/0x1f0 kernel_init_freeable+0x1b1/0x243 ? rest_init+0xd0/0xd0 kernel_init+0xa/0x130 ? calculate_sigpending+0x63/0x80 ? rest_init+0xd0/0xd0 ret_from_fork+0x1f/0x30 ---[ end trace 78201497ae74cc91 ]--- Reported-by: kernel test robot Fixes: 26b3a37b9284 ("NTB: Introduce MSI library") Signed-off-by: Logan Gunthorpe Signed-off-by: Jon Mason

Merge tag 'ntb-5.3' of git://github.com/jonmason/ntb

2019-07-21T16:46:59Z

Pull NTB updates from Jon Mason: "New feature to add support for NTB virtual MSI interrupts, the ability to test and use this feature in the NTB transport layer. Also, bug fixes for the AMD and Switchtec drivers, as well as some general patches" * tag 'ntb-5.3' of git://github.com/jonmason/ntb: (22 commits) NTB: Describe the ntb_msi_test client in the documentation. NTB: Add MSI interrupt support to ntb_transport NTB: Add ntb_msi_test support to ntb_test NTB: Introduce NTB MSI Test Client NTB: Introduce MSI library NTB: Rename ntb.c to support multiple source files in the module NTB: Introduce functions to calculate multi-port resource index NTB: Introduce helper functions to calculate logical port number PCI/switchtec: Add module parameter to request more interrupts PCI/MSI: Support allocating virtual MSI interrupts ntb_hw_switchtec: Fix setup MW with failure bug ntb_hw_switchtec: Skip unnecessary re-setup of shared memory window for crosslink case ntb_hw_switchtec: Remove redundant steps of switchtec_ntb_reinit_peer() function NTB: correct ntb_dev_ops and ntb_dev comment typos NTB: amd: Silence shift wrapping warning in amd_ntb_db_vector_mask() ntb_hw_switchtec: potential shift wrapping bug in switchtec_ntb_init_sndev() NTB: ntb_transport: Ensure qp->tx_mw_dma_addr is initaliazed NTB: ntb_hw_amd: set peer limit register NTB: ntb_perf: Clear stale values in doorbell and command SPAD register NTB: ntb_perf: Disable NTB link after clearing peer XLAT registers ...

NTB: Add MSI interrupt support to ntb_transport

2019-06-13T13:03:04Z

Introduce the module parameter 'use_msi' which, when set, uses MSI interrupts instead of doorbells for each queue pair (QP). The parameter is only available if NTB MSI support is configured into the kernel. We also require there to be more than one memory window (MW) so that an extra one is available to forward the APIC region. To use MSIs, we request one interrupt per QP and forward the MSI address and data to the peer using scratch pad registers (SPADS) above the MW SPADS. (If there are not enough SPADS the MSI interrupt will not be used.) Once registered, we simply use ntb_msi_peer_trigger and the receiving ISR simply queues up the rxc_db_work for the queue. This addition can significantly improve performance of ntb_transport. In a simple, untuned, apples-to-apples comparision using ntb_netdev and iperf with switchtec hardware, I see 3.88Gb/s without MSI interrupts and 14.1Gb/s wit MSI, which is a more than 3x improvement. Signed-off-by: Logan Gunthorpe Cc: Dave Jiang Cc: Allen Hubbe Signed-off-by: Jon Mason

NTB: Introduce NTB MSI Test Client

2019-06-13T13:02:51Z

Introduce a tool to test NTB MSI interrupts similar to the other NTB test tools. This tool creates a debugfs directory for each NTB device with the following files: port irqX_occurrences peerX/port peerX/count peerX/trigger The 'port' file tells the user the local port number and the 'occurrences' files tell the number of local interrupts that have been received for each interrupt. For each peer, the 'port' file and the 'count' file tell you the peer's port number and number of interrupts respectively. Writing the interrupt number to the 'trigger' file triggers the interrupt handler for the peer which should increment their corresponding 'occurrences' file. The 'ready' file indicates if a peer is ready, writing to this file blocks until it is ready. The module parameter num_irqs can be used to set the number of local interrupts. By default this is 4. This is only limited by the number of unused MSI interrupts registered by the hardware (this will require support of the hardware driver) and there must be at least 2*num_irqs + 1 spads registers available. Signed-off-by: Logan Gunthorpe Cc: Dave Jiang Cc: Allen Hubbe Signed-off-by: Jon Mason

NTB: Introduce MSI library

2019-06-13T13:02:33Z

The NTB MSI library allows passing MSI interrupts across a memory window. This offers similar functionality to doorbells or messages except will often have much better latency and the client can potentially use significantly more remote interrupts than typical hardware provides for doorbells. (Which can be important in high-multiport setups.) The library utilizes one memory window per peer and uses the highest index memory windows. Before any ntb_msi function may be used, the user must call ntb_msi_init(). It may then setup and tear down the memory windows when the link state changes using ntb_msi_setup_mws() and ntb_msi_clear_mws(). The peer which receives the interrupt must call ntb_msim_request_irq() to assign the interrupt handler (this function is functionally similar to devm_request_irq()) and the returned descriptor must be transferred to the peer which can use it to trigger the interrupt. The triggering peer, once having received the descriptor, can trigger the interrupt by calling ntb_msi_peer_trigger(). Signed-off-by: Logan Gunthorpe Cc: Dave Jiang Cc: Allen Hubbe Signed-off-by: Jon Mason

NTB: Rename ntb.c to support multiple source files in the module

2019-06-13T13:02:02Z

The kbuild system does not support having multiple source files in a module if one of those source files has the same name as the module. Therefore, we must rename ntb.c to core.c, while the module remains ntb.ko. This is similar to the way the nvme modules are structured. Signed-off-by: Logan Gunthorpe Cc: Dave Jiang Cc: Allen Hubbe Signed-off-by: Jon Mason

ntb_hw_switchtec: Fix setup MW with failure bug

2019-06-13T12:59:31Z

Switchtec does not support setting multiple MWs simultaneously. The driver takes a hardware lock to ensure that two peers are not doing this simultaneously and it fails if someone else takes the lock. In most cases, this is fine as clients only setup the MWs once on one side of the link. However, there's a race condition when a re-initialization is caused by a link event. The driver will re-setup the shared memory window asynchronously and this races with the client setting up it's memory windows on the link up event. To fix this we ensure do the entire initialization in a work queue and signal the client once it's done. Signed-off-by: Joey Zhang Signed-off-by: Wesley Sheng Signed-off-by: Jon Mason

ntb_hw_switchtec: Skip unnecessary re-setup of shared memory window for crosslink case

2019-06-13T12:59:28Z

In case of NTB crosslink topology, the setting of shared memory window in the virtual partition doesn't reset on peer's reboot. So skip the unnecessary re-setup of shared memory window for that case. Signed-off-by: Wesley Sheng Signed-off-by: Jon Mason

ntb_hw_switchtec: Remove redundant steps of switchtec_ntb_reinit_peer() function

2019-06-13T12:59:25Z

When a re-initialization is caused by a link event, the driver will re-setup the shared memory window. But at that time, the shared memory is still valid, and it's unnecessary to free, reallocate and then initialize it again. We only need to reconfigure the hardware registers. Remove the redundant steps from switchtec_ntb_reinit_peer() function. Signed-off-by: Joey Zhang Signed-off-by: Wesley Sheng Reviewed-by: Logan Gunthorpe Signed-off-by: Jon Mason

NTB: amd: Silence shift wrapping warning in amd_ntb_db_vector_mask()

2019-06-13T12:59:18Z

This code triggers a Smatch warning: drivers/ntb/hw/amd/ntb_hw_amd.c:336 amd_ntb_db_vector_mask() warn: should '(1 << db_vector)' be a 64 bit type? I don't think "db_vector" can be higher than 16 so this doesn't affect runtime, but it's nice to silence the static checker warning and we might increase "ndev->db_count" in the future. Signed-off-by: Dan Carpenter Acked-by: Shyam Sundar S K Signed-off-by: Jon Mason