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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 17:45:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 17:45:29 +0000 |
commit | 83506c85f8d4332b3edfdc8f1fd07aa691415350 (patch) | |
tree | 316b9630e093bb3b80e5d6e1c304151b5597901e /drivers/pci/pcie/rcec.c | |
parent | Adding upstream version 5.10.209. (diff) | |
download | linux-83506c85f8d4332b3edfdc8f1fd07aa691415350.tar.xz linux-83506c85f8d4332b3edfdc8f1fd07aa691415350.zip |
Adding upstream version 5.10.216.upstream/5.10.216
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/pci/pcie/rcec.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/pci/pcie/rcec.c b/drivers/pci/pcie/rcec.c new file mode 100644 index 000000000..038e9d706 --- /dev/null +++ b/drivers/pci/pcie/rcec.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Root Complex Event Collector Support + * + * Authors: + * Sean V Kelley <sean.v.kelley@intel.com> + * Qiuxu Zhuo <qiuxu.zhuo@intel.com> + * + * Copyright (C) 2020 Intel Corp. + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/pci_regs.h> + +#include "../pci.h" + +void pci_rcec_init(struct pci_dev *dev) +{ + struct rcec_ea *rcec_ea; + u32 rcec, hdr, busn; + u8 ver; + + /* Only for Root Complex Event Collectors */ + if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_EC) + return; + + rcec = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_RCEC); + if (!rcec) + return; + + rcec_ea = kzalloc(sizeof(*rcec_ea), GFP_KERNEL); + if (!rcec_ea) + return; + + pci_read_config_dword(dev, rcec + PCI_RCEC_RCIEP_BITMAP, + &rcec_ea->bitmap); + + /* Check whether RCEC BUSN register is present */ + pci_read_config_dword(dev, rcec, &hdr); + ver = PCI_EXT_CAP_VER(hdr); + if (ver >= PCI_RCEC_BUSN_REG_VER) { + pci_read_config_dword(dev, rcec + PCI_RCEC_BUSN, &busn); + rcec_ea->nextbusn = PCI_RCEC_BUSN_NEXT(busn); + rcec_ea->lastbusn = PCI_RCEC_BUSN_LAST(busn); + } else { + /* Avoid later ver check by setting nextbusn */ + rcec_ea->nextbusn = 0xff; + rcec_ea->lastbusn = 0x00; + } + + dev->rcec_ea = rcec_ea; +} + +void pci_rcec_exit(struct pci_dev *dev) +{ + kfree(dev->rcec_ea); + dev->rcec_ea = NULL; +} |