Date: Mon, 08 Dec 2025 15:44:14 +0000 From: Bjoern A. Zeeb <bz@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 2032abb31cbe - stable/15 - LinuxKPI: pci: undo the pci_resource_len() check in lkpi_pci_request_region() Message-ID: <6936f24e.384bc.79fe44ba@gitrepo.freebsd.org>
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The branch stable/15 has been updated by bz: URL: https://cgit.FreeBSD.org/src/commit/?id=2032abb31cbe067d41067a81e529d91f1bace4c9 commit 2032abb31cbe067d41067a81e529d91f1bace4c9 Author: Bjoern A. Zeeb <bz@FreeBSD.org> AuthorDate: 2025-12-02 16:04:22 +0000 Commit: Bjoern A. Zeeb <bz@FreeBSD.org> CommitDate: 2025-12-08 15:43:51 +0000 LinuxKPI: pci: undo the pci_resource_len() check in lkpi_pci_request_region() Creating non-passthru SR-IOV interfaces on a mlx5en(4) failed. The problem lies in the pci_resource_len() call but not that the BAR length is tmeporary 0 but in that we call lkpi_pci_get_bar() with a true argument which will create the BAR resource for us and report the approriate length back. However, the later call to bus_alloc_resource_any() will then fail given the resource already exists. Restore the previous behaviour and let bus_alloc_resource_any() do the work. Adjust the return values from -ENODEV to -EBUSY to match callers expectations. In linuxkpi_pcim_request_all_regions(), like in linuxkpi_pci_request_regions(), filter out the -EBUSY errors as "not an error" and try the next bar. This also seems to be consistent with the expectations of the callers. PR: 290793 Reported by: David BOYER (jcduss13 gmail.com) Tested on: mlx5en, iwlwifi, mt7921 Reviewed by: kib Fixes: 7e21158d44cd "implement [linuxkpi_]pcim_request_all_regions()" Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D53902 (cherry picked from commit ed29ffd396e522a45ab1980c12a75b3409b51712) --- sys/compat/linuxkpi/common/src/linux_pci.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c index 8507a59a8df3..fb3f648df496 100644 --- a/sys/compat/linuxkpi/common/src/linux_pci.c +++ b/sys/compat/linuxkpi/common/src/linux_pci.c @@ -1223,13 +1223,6 @@ lkpi_pci_request_region(struct pci_dev *pdev, int bar, const char *res_name, if (!lkpi_pci_bar_id_valid(bar)) return (-EINVAL); - /* - * If the bar is not valid, return success without adding the BAR; - * otherwise linuxkpi_pcim_request_all_regions() will error. - */ - if (pci_resource_len(pdev, bar) == 0) - return (0); - /* Likewise if it is neither IO nor MEM, nothing to do for us. */ type = pci_resource_type(pdev, bar); if (type < 0) return (0); @@ -1241,7 +1234,7 @@ lkpi_pci_request_region(struct pci_dev *pdev, int bar, const char *res_name, device_printf(pdev->dev.bsddev, "%s: failed to alloc " "bar %d type %d rid %d\n", __func__, bar, type, PCIR_BAR(bar)); - return (-ENODEV); + return (-EBUSY); } /* @@ -1285,7 +1278,7 @@ linuxkpi_pci_request_regions(struct pci_dev *pdev, const char *res_name) for (i = 0; i <= PCIR_MAX_BAR_0; i++) { error = pci_request_region(pdev, i, res_name); - if (error && error != -ENODEV) { + if (error && error != -EBUSY) { pci_release_regions(pdev); return (error); } @@ -1300,7 +1293,7 @@ linuxkpi_pcim_request_all_regions(struct pci_dev *pdev, const char *res_name) for (bar = 0; bar <= PCIR_MAX_BAR_0; bar++) { error = lkpi_pci_request_region(pdev, bar, res_name, true); - if (error != 0) { + if (error != 0 && error != -EBUSY) { device_printf(pdev->dev.bsddev, "%s: bar %d res_name '%s': " "lkpi_pci_request_region returned %d\n", __func__, bar, res_name, error);
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