Similar to regular resizable BAR, VF BAR can also be resized, e.g. by the system firmware or the PCI subsystem itself. Add the capability ID and restore it as a part of IOV state. See PCIe r4.0, sec 9.3.7.4. Signed-off-by: Michał Winiarski <michal.winiarski@xxxxxxxxx> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> --- drivers/pci/iov.c | 29 ++++++++++++++++++++++++++++- include/uapi/linux/pci_regs.h | 1 + 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index aaa33e8dc4c97..6bdc9950b9787 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -7,6 +7,7 @@ * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@xxxxxxxxx> */ +#include <linux/bitfield.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/export.h> @@ -862,6 +863,30 @@ static void sriov_release(struct pci_dev *dev) dev->sriov = NULL; } +static void sriov_restore_vf_rebar_state(struct pci_dev *dev) +{ + unsigned int pos, nbars, i; + u32 ctrl; + + pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VF_REBAR); + if (!pos) + return; + + pci_read_config_dword(dev, pos + PCI_REBAR_CTRL, &ctrl); + nbars = FIELD_GET(PCI_REBAR_CTRL_NBAR_MASK, ctrl); + + for (i = 0; i < nbars; i++, pos += 8) { + int bar_idx, size; + + pci_read_config_dword(dev, pos + PCI_REBAR_CTRL, &ctrl); + bar_idx = FIELD_GET(PCI_REBAR_CTRL_BAR_IDX, ctrl); + size = pci_rebar_bytes_to_size(dev->sriov->barsz[bar_idx]); + ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE; + ctrl |= FIELD_PREP(PCI_REBAR_CTRL_BAR_SIZE, size); + pci_write_config_dword(dev, pos + PCI_REBAR_CTRL, ctrl); + } +} + static void sriov_restore_state(struct pci_dev *dev) { int i; @@ -1021,8 +1046,10 @@ resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno) */ void pci_restore_iov_state(struct pci_dev *dev) { - if (dev->is_physfn) + if (dev->is_physfn) { + sriov_restore_vf_rebar_state(dev); sriov_restore_state(dev); + } } /** diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index 12323b3334a9c..a0cf701c4c3af 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -740,6 +740,7 @@ #define PCI_EXT_CAP_ID_L1SS 0x1E /* L1 PM Substates */ #define PCI_EXT_CAP_ID_PTM 0x1F /* Precision Time Measurement */ #define PCI_EXT_CAP_ID_DVSEC 0x23 /* Designated Vendor-Specific */ +#define PCI_EXT_CAP_ID_VF_REBAR 0x24 /* VF Resizable BAR */ #define PCI_EXT_CAP_ID_DLF 0x25 /* Data Link Feature */ #define PCI_EXT_CAP_ID_PL_16GT 0x26 /* Physical Layer 16.0 GT/s */ #define PCI_EXT_CAP_ID_NPEM 0x29 /* Native PCIe Enclosure Management */ -- 2.47.0