kernel/git/next/linux-next.git/drivers/pci/endpoint/functions, branch master

PCI: endpoint: pci-epf-vntb: Manage virtual NTB and PCI bus lifetime

2026-09-11T21:37:35+00:00

The virtual PCI driver registers an ntb_dev but has no remove callback. Unbinding the endpoint function can therefore free BARs while the NTB device and its client still use them. It also leaves the virtual PCI devices and root bus allocated. Allocate an ntb_dev for each virtual PCI probe and unregister it from the matching remove callback. Start command processing only after registration. Publish the device for doorbell IRQs at the same point. During remove, stop the command work and drain IRQ handlers before unregistering the device. Retain the root bus returned by pci_scan_bus() so it can be removed on unbind. Unregister the virtual PCI driver before releasing endpoint resources. Stop and remove the root bus under the PCI rescan/remove lock, then release its host bridge. Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP") Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Signed-off-by: Bjorn Helgaas Reviewed-by: Frank Li Cc: stable@vger.kernel.org # 6.0+ Link: https://patch.msgid.link/20260901063238.631166-3-den@valinux.co.jp

PCI: endpoint: pci-epf-vntb: Serialize virtual PCI bus scan

2026-09-10T14:58:25+00:00

The virtual PCI bus is scanned without holding the PCI rescan/remove lock. This can race with other PCI topology changes. Hold the lock across the bus scan and device addition. Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP") Suggested-by: Manivannan Sadhasivam Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Reviewed-by: Frank Li Link: https://lore.kernel.org/r/3tgrcel5fl55ulf3zjya4fkz4t2ms7iwwjif5rnzn2rafsydd6@i4e5etm7uqvz/ Link: https://patch.msgid.link/20260901063238.631166-2-den@valinux.co.jp

PCI: endpoint: pci-epf-vntb: Pass PF/VF number when BAR programming

2026-09-03T05:57:15+00:00

vntb_epf_mw_set_trans() programs the memory-window BAR through pci_epc_set_bar() with hardcoded function numbers (0, 0), so the BAR lands on the wrong function whenever the vNTB EPF is bound to anything but PF0. The other BAR programming sites in the vNTB driver already pass the EPF's own numbers. Pass the EPF's own func_no/vfunc_no here as well. Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP") Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Reviewed-by: Frank Li Link: https://patch.msgid.link/20260728172306.2751813-2-den@valinux.co.jp

Merge tag 'char-misc-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2026-08-25T16:38:50+00:00

Pull char/misc/IIO/etc driver updates from Greg KH: "Here is the big set of char, misc, iio, counter, fpga, and other small driver subsystems for 7.3-rc1. Overall, due to some driver removals we only added a bit more code than removed, which was a nice change. Highlights in this merge request are: - Loads of IIO driver updates and additions - binder driver updates (more on that below...) - Removal of the SGI XP and GRU drivers as they are not used anymore and turn out to be pretty insecure overall - Removal of the obsolete ibmasm driver as it's not being used anymore - Coresight driver updates and additions - Mei driver udpates - Counter driver updates - FPGA driver updates - ICC driver updates - lots and lots of other tiny driver updates to resolve reported issues All of these have been in linux-next for a while" * tag 'char-misc-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (513 commits) iio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF iio: adc: pac1921: fix wrong channel used in trigger handler read iio: light: gp2ap002: re-enable irq if runtime suspend fails iio: light: gp2ap002: Fix unbalanced runtime PM on repeated event writes iio: light: apds9306: fix PM reference leak in apds9306_read_data() iio: gyro: mpu3050: fix sign of raw angular velocity readings iio: srf04: fix pm_runtime handling on probe error path iio: adc: ad4080: configure backend data size iio: adc: adi-axi-adc: add data size support for AD408X backend iio: chemical: atlas-sensor: fix PM reference leak in buffer postenable iio: dac: ad5446: fix OF module device table iio: light: opt4001: Fix reversed GENMASK() arguments in fault count mask iio: light: opt4001: Reject integration times with a non-zero seconds part iio: light: opt4001: Fix incompatible pointer type passed to div_u64_rem() iio: light: opt4001: Fix power down clearing bits of the wrong register iio: light: opt4060: Fix incorrect register name in threshold read error message iio: light: opt4060: Fix pointer type passed to div_u64_rem() iio: light: opt4060: Reject integration times with a non-zero seconds part iio: light: ltrf216a: fix runtime PM reference leak in error path iio: pressure: dps310: fix NULL pointer dereference on ACPI probe ...

PCI: epf-mhi: Implement mhi_cntrl->flush_async() to flush DMA read/write

2026-07-30T05:19:51+00:00

The MHI core needs to make sure that all the current DMA transactions are completed before removing the channels. So implement the mhi_cntrl->flush_async() callback by first making sure all the in-flight DMA operations are completed and then flushing the DMA workqueue. Reviewed-by: Frank Li Signed-off-by: Manivannan Sadhasivam

PCI: epf-mhi: Use dmaengine_prep_config_single() to simplify code

2026-06-30T11:17:24+00:00

Use dmaengine_prep_config_single() to simplify pci_epf_mhi_edma_read[_sync]() and pci_epf_mhi_edma_write[_sync](). No functional change. Tested-by: Niklas Cassel Acked-by: Manivannan Sadhasivam Signed-off-by: Frank Li Link: https://patch.msgid.link/20260521-dma_prep_config-v7-8-1f73f4899883@nxp.com Signed-off-by: Vinod Koul

PCI: endpoint: pci-epf-test: Use dmaengine_prep_config_single() to simplify code

2026-06-30T11:17:10+00:00

Use dmaengine_prep_config_single() to simplify code. No functional change. Tested-by: Niklas Cassel Reviewed-by: Damien Le Moal Acked-by: Manivannan Sadhasivam Signed-off-by: Frank Li Link: https://patch.msgid.link/20260521-dma_prep_config-v7-3-1f73f4899883@nxp.com Signed-off-by: Vinod Koul

PCI: endpoint: pci-epf-vntb: Implement .db_vector_count()/mask() for doorbells

2026-06-23T16:37:27+00:00

Implement .db_vector_count() and .db_vector_mask() so NTB core/clients can map doorbell events to per-vector work and avoid the thundering-herd behavior. pci-epf-vntb reserves two slots in db_count: slot 0 for link events and slot 1 which is historically unused. Therefore the number of doorbell vectors is (db_count - 2). Report vectors as 0..N-1 and return BIT_ULL(db_vector) for the corresponding doorbell bit. Build db_valid_mask from a validated vector count so out-of-range db_count values cannot create invalid shifts. Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Signed-off-by: Bjorn Helgaas Reviewed-by: Frank Li Link: https://patch.msgid.link/20260513024923.451765-8-den@valinux.co.jp

PCI: endpoint: pci-epf-vntb: Exclude reserved slots from db_valid_mask

2026-06-23T15:41:47+00:00

In pci-epf-vntb, db_count represents the total number of doorbell slots exposed to the peer, including: - slot #0 reserved for link events, and - slot #1 historically unused (kept for compatibility). Only the remaining slots correspond to actual doorbell bits. The current db_valid_mask() exposes all slots as valid doorbells. Limit db_valid_mask() to the real doorbell bits by returning BIT_ULL(db_count - 2) - 1, and guard against db_count < 2. Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP") Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Signed-off-by: Bjorn Helgaas Reviewed-by: Frank Li Link: https://patch.msgid.link/20260513024923.451765-7-den@valinux.co.jp

PCI: endpoint: pci-epf-vntb: Guard configfs writes after EPC attach

2026-06-22T20:31:11+00:00

db_count controls how many doorbell slots are allocated and exposed. It is also used by the doorbell mask helpers. After an EPC has been attached, changing it from configfs can leave runtime paths using a different count than the one used to set up the doorbell resources. Reject db_count writes after EPC attach, and reject values outside MIN_DB_COUNT..MAX_DB_COUNT before attach. Now that MIN_DB_COUNT documents the usable doorbell floor, use it in the store path too. While at it, apply the same after-attach guard to the other vNTB configfs knobs. BAR choices, spad_count, memory-window counts and sizes, and the virtual PCI IDs are also consumed during bind, so changing them later at runtime is meaningless and unsafe. Return -EOPNOTSUPP for after-attach writes. The value itself may be valid, but changing it in that state is not supported. Signed-off-by: Koichiro Den Signed-off-by: Manivannan Sadhasivam Signed-off-by: Bjorn Helgaas Reviewed-by: Frank Li Link: https://patch.msgid.link/20260513024923.451765-6-den@valinux.co.jp