kernel/drivers/ntb/hw/epf, branch linux-6.9.y

ntb: epf: Remove redundant pci_clear_master

2023-07-08T15:02:37Z

Remove pci_clear_master to simplify the code, the bus-mastering is also cleared in do_pci_disable_device, like this: ./drivers/pci/pci.c:2197 static void do_pci_disable_device(struct pci_dev *dev) { u16 pci_command; pci_read_config_word(dev, PCI_COMMAND, &pci_command); if (pci_command & PCI_COMMAND_MASTER) { pci_command &= ~PCI_COMMAND_MASTER; pci_write_config_word(dev, PCI_COMMAND, pci_command); } pcibios_disable_device(dev); }. And dev->is_busmaster is set to 0 in pci_disable_device. Signed-off-by: Cai Huoqing Signed-off-by: Jon Mason

NTB: epf: Allow more flexibility in the memory BAR map method

2022-08-09T21:54:03Z

Support the below BAR configuration methods for epf NTB. BAR 0: config and scratchpad BAR 2: doorbell BAR 4: memory map windows Set difference BAR number information into struct ntb_epf_data. So difference VID/PID can choose different BAR configurations. There are difference BAR map method between epf NTB and epf vNTB Endpoint function. Signed-off-by: Frank Li Signed-off-by: Jon Mason

NTB: Add support for EPF PCI Non-Transparent Bridge

2021-02-23T20:12:53Z

Add support for EPF PCI Non-Transparent Bridge (NTB) devices. This driver is platform independent and may be used by any platform that has multiple PCI endpoint instances configured using the pci-epf-ntb driver. The driver connnects to the standard NTB subsystem interface. The EPF NTB device has a configurable number of memory windows (max 4), a configurable number of doorbells (max 32), and a configurable number of scratch-pad registers. Link: https://lore.kernel.org/r/20210201195809.7342-16-kishon@ti.com Signed-off-by: Kishon Vijay Abraham I Signed-off-by: Lorenzo Pieralisi Signed-off-by: Bjorn Helgaas Reviewed-by: Dave Jiang