kernel/linux.git/drivers/pci/switch, branch v6.12.80

PCI: switchtec: Add Microchip PCI100X device IDs

2025-02-21T13:01:24+00:00

[ Upstream commit a3282f84b2151d254dc4abf24d1255c6382be774 ] Add Microchip parts to the Device ID table so the driver supports PCI100x devices. Add a new macro to quirk the Microchip Switchtec PCI100x parts to allow DMA access via NTB to work when the IOMMU is turned on. PCI100x family has 6 variants; each variant is designed for different application usages, different port counts and lane counts: PCI1001 has 1 x4 upstream port and 3 x4 downstream ports PCI1002 has 1 x4 upstream port and 4 x2 downstream ports PCI1003 has 2 x4 upstream ports, 2 x2 upstream ports, and 2 x2 downstream ports PCI1004 has 4 x4 upstream ports PCI1005 has 1 x4 upstream port and 6 x2 downstream ports PCI1006 has 6 x2 upstream ports and 2 x2 downstream ports [Historical note: these parts use PCI_VENDOR_ID_EFAR (0x1055), from EFAR Microsystems, which was acquired in 1996 by Standard Microsystems Corp, which was acquired by Microchip Technology in 2012. The PCI-SIG confirms that Vendor ID 0x1055 is assigned to Microchip even though it's not visible via https://pcisig.com/membership/member-companies] Link: https://lore.kernel.org/r/20250120095524.243103-1-Saladi.Rakeshbabu@microchip.com Signed-off-by: Rakesh Babu Saladi [bhelgaas: Vendor ID history] Signed-off-by: Bjorn Helgaas Acked-By: Logan Gunthorpe Signed-off-by: Sasha Levin

PCI: switchtec: Make switchtec_class constant

2024-06-10T20:03:30+00:00

Now that the driver core allows for struct class to be in read-only memory, we should make all 'class' structures declared at build time placing them into read-only memory, instead of having to be dynamically allocated at runtime. Link: https://lore.kernel.org/r/2024061053-online-unwound-b173@gregkh Signed-off-by: Greg Kroah-Hartman Signed-off-by: Bjorn Helgaas Reviewed-by: Dave Jiang Reviewed-By: Logan Gunthorpe Cc: Kurt Schwemmer Cc: Jon Mason Cc: Allen Hubbe

PCI: switchtec: Fix an error handling path in switchtec_pci_probe()

2024-02-08T21:35:38+00:00

The commit in Fixes changed the logic on how resources are released and introduced a new switchtec_exit_pci() that need to be called explicitly in order to undo a corresponding switchtec_init_pci(). This was done in the remove function, but not in the probe. Fix the probe now. Fixes: df25461119d9 ("PCI: switchtec: Fix stdev_release() crash after surprise hot remove") Link: https://lore.kernel.org/r/01446d2ccb91a578239915812f2b7dfbeb2882af.1703428183.git.christophe.jaillet@wanadoo.fr Signed-off-by: Christophe JAILLET Signed-off-by: Bjorn Helgaas

PCI: switchtec: Fix stdev_release() crash after surprise hot remove

2023-11-22T15:44:06+00:00

A PCI device hot removal may occur while stdev->cdev is held open. The call to stdev_release() then happens during close or exit, at a point way past switchtec_pci_remove(). Otherwise the last ref would vanish with the trailing put_device(), just before return. At that later point in time, the devm cleanup has already removed the stdev->mmio_mrpc mapping. Also, the stdev->pdev reference was not a counted one. Therefore, in DMA mode, the iowrite32() in stdev_release() will cause a fatal page fault, and the subsequent dma_free_coherent(), if reached, would pass a stale &stdev->pdev->dev pointer. Fix by moving MRPC DMA shutdown into switchtec_pci_remove(), after stdev_kill(). Counting the stdev->pdev ref is now optional, but may prevent future accidents. Reproducible via the script at https://lore.kernel.org/r/20231113212150.96410-1-dns@arista.com Link: https://lore.kernel.org/r/20231122042316.91208-2-dns@arista.com Signed-off-by: Daniel Stodden Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe Reviewed-by: Dmitry Safonov

PCI: switchtec: Add support for PCIe Gen5 devices

2023-08-09T19:16:44+00:00

Advertise support of Gen5 devices in the driver's device ID table and add the same IDs for the switchtec quirks. Also update driver code to accommodate them. Link: https://lore.kernel.org/r/20230624000003.2315364-3-kelvin.cao@microchip.com Signed-off-by: Kelvin Cao Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe

PCI: switchtec: Use normal comment style

2023-08-09T19:16:35+00:00

Use normal comment style '/* */' for device ID description. Link: https://lore.kernel.org/r/20230624000003.2315364-2-kelvin.cao@microchip.com Signed-off-by: Kelvin Cao Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe

driver core: class: remove module * from class_create()

2023-03-17T14:16:33+00:00

The module pointer in class_create() never actually did anything, and it shouldn't have been requred to be set as a parameter even if it did something. So just remove it and fix up all callers of the function in the kernel tree at the same time. Cc: "Rafael J. Wysocki" Acked-by: Benjamin Tissoires Link: https://lore.kernel.org/r/20230313181843.1207845-4-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

PCI: switchtec: Return -EFAULT for copy_to_user() errors

2023-01-18T17:11:20+00:00

switchtec_dev_read() didn't handle copy_to_user() errors correctly: it assigned "rc = -EFAULT", but actually returned either "size", -ENXIO, or -EBADMSG instead. Update the failure cases to unlock mrpc_mutex and return -EFAULT directly. Link: https://lore.kernel.org/r/20221216162126.207863-3-helgaas@kernel.org Fixes: 080b47def5e5 ("MicroSemi Switchtec management interface driver") Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe

PCI: switchtec: Simplify switchtec_dma_mrpc_isr()

2023-01-18T17:11:14+00:00

The "ret" variable in switchtec_dma_mrpc_isr() is superfluous. Remove it and just return the value. No functional change intended. Link: https://lore.kernel.org/r/20221216162126.207863-2-helgaas@kernel.org Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe

PCI: switchtec: Prefer ida_alloc()/free() over ida_simple_get()/remove()

2022-06-09T17:28:21+00:00

Use ida_alloc() and ida_free() instead of deprecated ida_simple_get() and ida_simple_remove(). Link: https://lore.kernel.org/r/20220602071115.3833935-1-liuke94@huawei.com Signed-off-by: Ke Liu Signed-off-by: Bjorn Helgaas Acked-by: Logan Gunthorpe