mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Highlights: - Restructure Linux PTE on Book3S/64 to Radix format from Paul Mackerras - Book3s 64 MMU cleanup in preparation for Radix MMU from Aneesh Kumar K.V - Add POWER9 cputable entry from Michael Neuling - FPU/Altivec/VSX save/restore optimisations from Cyril Bur - Add support for new ftrace ABI on ppc64le from Torsten Duwe Various cleanups & minor fixes from: - Adam Buchbinder, Andrew Donnellan, Balbir Singh, Christophe Leroy, Cyril Bur, Luis Henriques, Madhavan Srinivasan, Pan Xinhui, Russell Currey, Sukadev Bhattiprolu, Suraj Jitindar Singh. General: - atomics: Allow architectures to define their own __atomic_op_* helpers from Boqun Feng - Implement atomic{, 64}_*_return_* variants and acquire/release/relaxed variants for (cmp)xchg from Boqun Feng - Add powernv_defconfig from Jeremy Kerr - Fix BUG_ON() reporting in real mode from Balbir Singh - Add xmon command to dump OPAL msglog from Andrew Donnellan - Add xmon command to dump process/task similar to ps(1) from Douglas Miller - Clean up memory hotplug failure paths from David Gibson pci/eeh: - Redesign SR-IOV on PowerNV to give absolute isolation between VFs from Wei Yang. - EEH Support for SRIOV VFs from Wei Yang and Gavin Shan. - PCI/IOV: Rename and export virtfn_{add, remove} from Wei Yang - PCI: Add pcibios_bus_add_device() weak function from Wei Yang - MAINTAINERS: Update EEH details and maintainership from Russell Currey cxl: - Support added to the CXL driver for running on both bare-metal and hypervisor systems, from Christophe Lombard and Frederic Barrat. - Ignore probes for virtual afu pci devices from Vaibhav Jain perf: - Export Power8 generic and cache events to sysfs from Sukadev Bhattiprolu - hv-24x7: Fix usage with chip events, display change in counter values, display domain indices in sysfs, eliminate domain suffix in event names, from Sukadev Bhattiprolu Freescale: - Updates from Scott: "Highlights include 8xx optimizations, 32-bit checksum optimizations, 86xx consolidation, e5500/e6500 cpu hotplug, more fman and other dt bits, and minor fixes/cleanup." -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJW69OrAAoJEFHr6jzI4aWAe5EQAJw/hE6WBQc6a7Tj70AnXOqR qk/m5pZjuTwQxfBteIvHR1pE5eXdlvtAjcD254LVkFkAbIn19W/h2k0VX/nlee7P n/VRHRifjtGmukqHrPYJJ7ua9mNlY7pxh3leGSixBFASnSWqMxNNNziNQtSTcuCs TjHiw6NkZ/kzeunA4bAfE4yHVUZjmL74oiS9JbLyaVHqoW4fqWLlh26AKo2yYMZI qPicBBG4HBi3FGvoexnKxlJNdcV4HO7LzDjJmCSfUKYCJi+Pw19T5qmhso0q0qVz vHg/A8HNeG4Hn83pNVmLeQSAIQRZ3DvTtcLgbjPo+TVwm/hzrRRBWipTeOVbkLW8 2bcOXT4t7LWUq15EAJ1LYgYZGzcLrfRfUeOcuQ1TWd3+PcfY9pE7FmizsxAAfaVe E9j9mpz4XnIqBtWkFHneTIHkQ5OWptyKuZJEaYH0nut4VsP0k8NarkseafGqBPu7 5eG83gbiQbCVixfOgblV9eocJ29JcwpjPAY4CZSGJimShg909FV7WRgZgJkKWrbK dBRco8Jcp4VglGfo2qymv7Uj4KwQoypBREOhiKUvrAsVlDxPfx+bcskhjGu9xGDC xs/+nme0/lKa/wg5K4C3mQ1GAlkMWHI0ojhJjsyODbetup5UbkEu03wjAaTdO9dT Y6ptGm0rYAJluPNlziFj =qkAt -----END PGP SIGNATURE----- Merge tag 'powerpc-4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: "This was delayed a day or two by some build-breakage on old toolchains which we've now fixed. There's two PCI commits both acked by Bjorn. There's one commit to mm/hugepage.c which is (co)authored by Kirill. Highlights: - Restructure Linux PTE on Book3S/64 to Radix format from Paul Mackerras - Book3s 64 MMU cleanup in preparation for Radix MMU from Aneesh Kumar K.V - Add POWER9 cputable entry from Michael Neuling - FPU/Altivec/VSX save/restore optimisations from Cyril Bur - Add support for new ftrace ABI on ppc64le from Torsten Duwe Various cleanups & minor fixes from: - Adam Buchbinder, Andrew Donnellan, Balbir Singh, Christophe Leroy, Cyril Bur, Luis Henriques, Madhavan Srinivasan, Pan Xinhui, Russell Currey, Sukadev Bhattiprolu, Suraj Jitindar Singh. General: - atomics: Allow architectures to define their own __atomic_op_* helpers from Boqun Feng - Implement atomic{, 64}_*_return_* variants and acquire/release/ relaxed variants for (cmp)xchg from Boqun Feng - Add powernv_defconfig from Jeremy Kerr - Fix BUG_ON() reporting in real mode from Balbir Singh - Add xmon command to dump OPAL msglog from Andrew Donnellan - Add xmon command to dump process/task similar to ps(1) from Douglas Miller - Clean up memory hotplug failure paths from David Gibson pci/eeh: - Redesign SR-IOV on PowerNV to give absolute isolation between VFs from Wei Yang. - EEH Support for SRIOV VFs from Wei Yang and Gavin Shan. - PCI/IOV: Rename and export virtfn_{add, remove} from Wei Yang - PCI: Add pcibios_bus_add_device() weak function from Wei Yang - MAINTAINERS: Update EEH details and maintainership from Russell Currey cxl: - Support added to the CXL driver for running on both bare-metal and hypervisor systems, from Christophe Lombard and Frederic Barrat. - Ignore probes for virtual afu pci devices from Vaibhav Jain perf: - Export Power8 generic and cache events to sysfs from Sukadev Bhattiprolu - hv-24x7: Fix usage with chip events, display change in counter values, display domain indices in sysfs, eliminate domain suffix in event names, from Sukadev Bhattiprolu Freescale: - Updates from Scott: "Highlights include 8xx optimizations, 32-bit checksum optimizations, 86xx consolidation, e5500/e6500 cpu hotplug, more fman and other dt bits, and minor fixes/cleanup" * tag 'powerpc-4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (179 commits) powerpc: Fix unrecoverable SLB miss during restore_math() powerpc/8xx: Fix do_mtspr_cpu6() build on older compilers powerpc/rcpm: Fix build break when SMP=n powerpc/book3e-64: Use hardcoded mttmr opcode powerpc/fsl/dts: Add "jedec,spi-nor" flash compatible powerpc/T104xRDB: add tdm riser card node to device tree powerpc32: PAGE_EXEC required for inittext powerpc/mpc85xx: Add pcsphy nodes to FManV3 device tree powerpc/mpc85xx: Add MDIO bus muxing support to the board device tree(s) powerpc/86xx: Introduce and use common dtsi powerpc/86xx: Update device tree powerpc/86xx: Move dts files to fsl directory powerpc/86xx: Switch to kconfig fragments approach powerpc/86xx: Update defconfigs powerpc/86xx: Consolidate common platform code powerpc32: Remove one insn in mulhdu powerpc32: small optimisation in flush_icache_range() powerpc: Simplify test in __dma_sync() powerpc32: move xxxxx_dcache_range() functions inline powerpc32: Remove clear_pages() and define clear_page() inline ...
761 lines
18 KiB
C
761 lines
18 KiB
C
/*
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* drivers/pci/iov.c
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*
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* Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
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*
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* PCI Express I/O Virtualization (IOV) support.
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* Single Root IOV 1.0
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* Address Translation Service 1.0
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*/
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/export.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/pci-ats.h>
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#include "pci.h"
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#define VIRTFN_ID_LEN 16
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int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id)
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{
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if (!dev->is_physfn)
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return -EINVAL;
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return dev->bus->number + ((dev->devfn + dev->sriov->offset +
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dev->sriov->stride * vf_id) >> 8);
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}
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int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id)
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{
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if (!dev->is_physfn)
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return -EINVAL;
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return (dev->devfn + dev->sriov->offset +
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dev->sriov->stride * vf_id) & 0xff;
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}
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/*
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* Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may
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* change when NumVFs changes.
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*
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* Update iov->offset and iov->stride when NumVFs is written.
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*/
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static inline void pci_iov_set_numvfs(struct pci_dev *dev, int nr_virtfn)
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{
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struct pci_sriov *iov = dev->sriov;
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, nr_virtfn);
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_OFFSET, &iov->offset);
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride);
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}
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/*
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* The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride
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* determine how many additional bus numbers will be consumed by VFs.
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*
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* Iterate over all valid NumVFs, validate offset and stride, and calculate
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* the maximum number of bus numbers that could ever be required.
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*/
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static int compute_max_vf_buses(struct pci_dev *dev)
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{
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struct pci_sriov *iov = dev->sriov;
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int nr_virtfn, busnr, rc = 0;
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for (nr_virtfn = iov->total_VFs; nr_virtfn; nr_virtfn--) {
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pci_iov_set_numvfs(dev, nr_virtfn);
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if (!iov->offset || (nr_virtfn > 1 && !iov->stride)) {
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rc = -EIO;
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goto out;
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}
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busnr = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
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if (busnr > iov->max_VF_buses)
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iov->max_VF_buses = busnr;
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}
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out:
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pci_iov_set_numvfs(dev, 0);
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return rc;
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}
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static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
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{
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struct pci_bus *child;
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if (bus->number == busnr)
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return bus;
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child = pci_find_bus(pci_domain_nr(bus), busnr);
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if (child)
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return child;
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child = pci_add_new_bus(bus, NULL, busnr);
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if (!child)
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return NULL;
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pci_bus_insert_busn_res(child, busnr, busnr);
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return child;
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}
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static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus)
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{
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if (physbus != virtbus && list_empty(&virtbus->devices))
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pci_remove_bus(virtbus);
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}
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resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno)
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{
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if (!dev->is_physfn)
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return 0;
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return dev->sriov->barsz[resno - PCI_IOV_RESOURCES];
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}
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int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
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{
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int i;
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int rc = -ENOMEM;
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u64 size;
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char buf[VIRTFN_ID_LEN];
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struct pci_dev *virtfn;
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struct resource *res;
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struct pci_sriov *iov = dev->sriov;
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struct pci_bus *bus;
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mutex_lock(&iov->dev->sriov->lock);
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bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id));
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if (!bus)
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goto failed;
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virtfn = pci_alloc_dev(bus);
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if (!virtfn)
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goto failed0;
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virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
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virtfn->vendor = dev->vendor;
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
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pci_setup_device(virtfn);
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virtfn->dev.parent = dev->dev.parent;
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virtfn->physfn = pci_dev_get(dev);
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virtfn->is_virtfn = 1;
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virtfn->multifunction = 0;
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for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
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res = &dev->resource[i + PCI_IOV_RESOURCES];
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if (!res->parent)
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continue;
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virtfn->resource[i].name = pci_name(virtfn);
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virtfn->resource[i].flags = res->flags;
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size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
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virtfn->resource[i].start = res->start + size * id;
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virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
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rc = request_resource(res, &virtfn->resource[i]);
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BUG_ON(rc);
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}
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if (reset)
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__pci_reset_function(virtfn);
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pci_device_add(virtfn, virtfn->bus);
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mutex_unlock(&iov->dev->sriov->lock);
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pci_bus_add_device(virtfn);
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sprintf(buf, "virtfn%u", id);
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rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
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if (rc)
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goto failed1;
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rc = sysfs_create_link(&virtfn->dev.kobj, &dev->dev.kobj, "physfn");
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if (rc)
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goto failed2;
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kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
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return 0;
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failed2:
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sysfs_remove_link(&dev->dev.kobj, buf);
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failed1:
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pci_dev_put(dev);
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mutex_lock(&iov->dev->sriov->lock);
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pci_stop_and_remove_bus_device(virtfn);
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failed0:
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virtfn_remove_bus(dev->bus, bus);
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failed:
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mutex_unlock(&iov->dev->sriov->lock);
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return rc;
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}
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void pci_iov_remove_virtfn(struct pci_dev *dev, int id, int reset)
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{
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char buf[VIRTFN_ID_LEN];
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struct pci_dev *virtfn;
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struct pci_sriov *iov = dev->sriov;
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virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
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pci_iov_virtfn_bus(dev, id),
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pci_iov_virtfn_devfn(dev, id));
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if (!virtfn)
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return;
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if (reset) {
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device_release_driver(&virtfn->dev);
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__pci_reset_function(virtfn);
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}
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sprintf(buf, "virtfn%u", id);
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sysfs_remove_link(&dev->dev.kobj, buf);
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/*
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* pci_stop_dev() could have been called for this virtfn already,
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* so the directory for the virtfn may have been removed before.
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* Double check to avoid spurious sysfs warnings.
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*/
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if (virtfn->dev.kobj.sd)
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sysfs_remove_link(&virtfn->dev.kobj, "physfn");
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mutex_lock(&iov->dev->sriov->lock);
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pci_stop_and_remove_bus_device(virtfn);
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virtfn_remove_bus(dev->bus, virtfn->bus);
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mutex_unlock(&iov->dev->sriov->lock);
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/* balance pci_get_domain_bus_and_slot() */
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pci_dev_put(virtfn);
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pci_dev_put(dev);
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}
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int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
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{
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return 0;
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}
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int __weak pcibios_sriov_disable(struct pci_dev *pdev)
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{
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return 0;
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}
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static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
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{
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int rc;
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int i;
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int nres;
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u16 initial;
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struct resource *res;
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struct pci_dev *pdev;
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struct pci_sriov *iov = dev->sriov;
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int bars = 0;
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int bus;
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if (!nr_virtfn)
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return 0;
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if (iov->num_VFs)
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return -EINVAL;
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pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
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if (initial > iov->total_VFs ||
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(!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs)))
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return -EIO;
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if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs ||
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(!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
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return -EINVAL;
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nres = 0;
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for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
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bars |= (1 << (i + PCI_IOV_RESOURCES));
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res = &dev->resource[i + PCI_IOV_RESOURCES];
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if (res->parent)
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nres++;
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}
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if (nres != iov->nres) {
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dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
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return -ENOMEM;
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}
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bus = pci_iov_virtfn_bus(dev, nr_virtfn - 1);
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if (bus > dev->bus->busn_res.end) {
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dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n",
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nr_virtfn, bus, &dev->bus->busn_res);
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return -ENOMEM;
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}
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if (pci_enable_resources(dev, bars)) {
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dev_err(&dev->dev, "SR-IOV: IOV BARS not allocated\n");
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return -ENOMEM;
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}
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if (iov->link != dev->devfn) {
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pdev = pci_get_slot(dev->bus, iov->link);
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if (!pdev)
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return -ENODEV;
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if (!pdev->is_physfn) {
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pci_dev_put(pdev);
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return -ENOSYS;
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}
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rc = sysfs_create_link(&dev->dev.kobj,
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&pdev->dev.kobj, "dep_link");
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pci_dev_put(pdev);
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if (rc)
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return rc;
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}
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pci_iov_set_numvfs(dev, nr_virtfn);
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iov->ctrl |= PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE;
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pci_cfg_access_lock(dev);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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msleep(100);
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pci_cfg_access_unlock(dev);
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iov->initial_VFs = initial;
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if (nr_virtfn < initial)
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initial = nr_virtfn;
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rc = pcibios_sriov_enable(dev, initial);
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if (rc) {
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dev_err(&dev->dev, "failure %d from pcibios_sriov_enable()\n", rc);
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goto err_pcibios;
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}
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for (i = 0; i < initial; i++) {
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rc = pci_iov_add_virtfn(dev, i, 0);
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if (rc)
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goto failed;
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}
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kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
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iov->num_VFs = nr_virtfn;
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return 0;
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failed:
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while (i--)
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pci_iov_remove_virtfn(dev, i, 0);
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pcibios_sriov_disable(dev);
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err_pcibios:
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iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
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pci_cfg_access_lock(dev);
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pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
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ssleep(1);
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pci_cfg_access_unlock(dev);
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if (iov->link != dev->devfn)
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sysfs_remove_link(&dev->dev.kobj, "dep_link");
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pci_iov_set_numvfs(dev, 0);
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return rc;
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}
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static void sriov_disable(struct pci_dev *dev)
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{
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int i;
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struct pci_sriov *iov = dev->sriov;
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if (!iov->num_VFs)
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|
return;
|
|
|
|
for (i = 0; i < iov->num_VFs; i++)
|
|
pci_iov_remove_virtfn(dev, i, 0);
|
|
|
|
pcibios_sriov_disable(dev);
|
|
|
|
iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
|
|
pci_cfg_access_lock(dev);
|
|
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
|
|
ssleep(1);
|
|
pci_cfg_access_unlock(dev);
|
|
|
|
if (iov->link != dev->devfn)
|
|
sysfs_remove_link(&dev->dev.kobj, "dep_link");
|
|
|
|
iov->num_VFs = 0;
|
|
pci_iov_set_numvfs(dev, 0);
|
|
}
|
|
|
|
static int sriov_init(struct pci_dev *dev, int pos)
|
|
{
|
|
int i, bar64;
|
|
int rc;
|
|
int nres;
|
|
u32 pgsz;
|
|
u16 ctrl, total;
|
|
struct pci_sriov *iov;
|
|
struct resource *res;
|
|
struct pci_dev *pdev;
|
|
|
|
pci_read_config_word(dev, pos + PCI_SRIOV_CTRL, &ctrl);
|
|
if (ctrl & PCI_SRIOV_CTRL_VFE) {
|
|
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
|
|
ssleep(1);
|
|
}
|
|
|
|
ctrl = 0;
|
|
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
|
|
if (pdev->is_physfn)
|
|
goto found;
|
|
|
|
pdev = NULL;
|
|
if (pci_ari_enabled(dev->bus))
|
|
ctrl |= PCI_SRIOV_CTRL_ARI;
|
|
|
|
found:
|
|
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
|
|
|
|
pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
|
|
if (!total)
|
|
return 0;
|
|
|
|
pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz);
|
|
i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0;
|
|
pgsz &= ~((1 << i) - 1);
|
|
if (!pgsz)
|
|
return -EIO;
|
|
|
|
pgsz &= ~(pgsz - 1);
|
|
pci_write_config_dword(dev, pos + PCI_SRIOV_SYS_PGSIZE, pgsz);
|
|
|
|
iov = kzalloc(sizeof(*iov), GFP_KERNEL);
|
|
if (!iov)
|
|
return -ENOMEM;
|
|
|
|
nres = 0;
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
|
res = &dev->resource[i + PCI_IOV_RESOURCES];
|
|
/*
|
|
* If it is already FIXED, don't change it, something
|
|
* (perhaps EA or header fixups) wants it this way.
|
|
*/
|
|
if (res->flags & IORESOURCE_PCI_FIXED)
|
|
bar64 = (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
|
|
else
|
|
bar64 = __pci_read_base(dev, pci_bar_unknown, res,
|
|
pos + PCI_SRIOV_BAR + i * 4);
|
|
if (!res->flags)
|
|
continue;
|
|
if (resource_size(res) & (PAGE_SIZE - 1)) {
|
|
rc = -EIO;
|
|
goto failed;
|
|
}
|
|
iov->barsz[i] = resource_size(res);
|
|
res->end = res->start + resource_size(res) * total - 1;
|
|
dev_info(&dev->dev, "VF(n) BAR%d space: %pR (contains BAR%d for %d VFs)\n",
|
|
i, res, i, total);
|
|
i += bar64;
|
|
nres++;
|
|
}
|
|
|
|
iov->pos = pos;
|
|
iov->nres = nres;
|
|
iov->ctrl = ctrl;
|
|
iov->total_VFs = total;
|
|
iov->pgsz = pgsz;
|
|
iov->self = dev;
|
|
pci_read_config_dword(dev, pos + PCI_SRIOV_CAP, &iov->cap);
|
|
pci_read_config_byte(dev, pos + PCI_SRIOV_FUNC_LINK, &iov->link);
|
|
if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END)
|
|
iov->link = PCI_DEVFN(PCI_SLOT(dev->devfn), iov->link);
|
|
|
|
if (pdev)
|
|
iov->dev = pci_dev_get(pdev);
|
|
else
|
|
iov->dev = dev;
|
|
|
|
mutex_init(&iov->lock);
|
|
|
|
dev->sriov = iov;
|
|
dev->is_physfn = 1;
|
|
rc = compute_max_vf_buses(dev);
|
|
if (rc)
|
|
goto fail_max_buses;
|
|
|
|
return 0;
|
|
|
|
fail_max_buses:
|
|
dev->sriov = NULL;
|
|
dev->is_physfn = 0;
|
|
failed:
|
|
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
|
|
res = &dev->resource[i + PCI_IOV_RESOURCES];
|
|
res->flags = 0;
|
|
}
|
|
|
|
kfree(iov);
|
|
return rc;
|
|
}
|
|
|
|
static void sriov_release(struct pci_dev *dev)
|
|
{
|
|
BUG_ON(dev->sriov->num_VFs);
|
|
|
|
if (dev != dev->sriov->dev)
|
|
pci_dev_put(dev->sriov->dev);
|
|
|
|
mutex_destroy(&dev->sriov->lock);
|
|
|
|
kfree(dev->sriov);
|
|
dev->sriov = NULL;
|
|
}
|
|
|
|
static void sriov_restore_state(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
u16 ctrl;
|
|
struct pci_sriov *iov = dev->sriov;
|
|
|
|
pci_read_config_word(dev, iov->pos + PCI_SRIOV_CTRL, &ctrl);
|
|
if (ctrl & PCI_SRIOV_CTRL_VFE)
|
|
return;
|
|
|
|
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++)
|
|
pci_update_resource(dev, i);
|
|
|
|
pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
|
|
pci_iov_set_numvfs(dev, iov->num_VFs);
|
|
pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
|
|
if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
|
|
msleep(100);
|
|
}
|
|
|
|
/**
|
|
* pci_iov_init - initialize the IOV capability
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns 0 on success, or negative on failure.
|
|
*/
|
|
int pci_iov_init(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
|
|
if (!pci_is_pcie(dev))
|
|
return -ENODEV;
|
|
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV);
|
|
if (pos)
|
|
return sriov_init(dev, pos);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* pci_iov_release - release resources used by the IOV capability
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_iov_release(struct pci_dev *dev)
|
|
{
|
|
if (dev->is_physfn)
|
|
sriov_release(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_iov_resource_bar - get position of the SR-IOV BAR
|
|
* @dev: the PCI device
|
|
* @resno: the resource number
|
|
*
|
|
* Returns position of the BAR encapsulated in the SR-IOV capability.
|
|
*/
|
|
int pci_iov_resource_bar(struct pci_dev *dev, int resno)
|
|
{
|
|
if (resno < PCI_IOV_RESOURCES || resno > PCI_IOV_RESOURCE_END)
|
|
return 0;
|
|
|
|
BUG_ON(!dev->is_physfn);
|
|
|
|
return dev->sriov->pos + PCI_SRIOV_BAR +
|
|
4 * (resno - PCI_IOV_RESOURCES);
|
|
}
|
|
|
|
resource_size_t __weak pcibios_iov_resource_alignment(struct pci_dev *dev,
|
|
int resno)
|
|
{
|
|
return pci_iov_resource_size(dev, resno);
|
|
}
|
|
|
|
/**
|
|
* pci_sriov_resource_alignment - get resource alignment for VF BAR
|
|
* @dev: the PCI device
|
|
* @resno: the resource number
|
|
*
|
|
* Returns the alignment of the VF BAR found in the SR-IOV capability.
|
|
* This is not the same as the resource size which is defined as
|
|
* the VF BAR size multiplied by the number of VFs. The alignment
|
|
* is just the VF BAR size.
|
|
*/
|
|
resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno)
|
|
{
|
|
return pcibios_iov_resource_alignment(dev, resno);
|
|
}
|
|
|
|
/**
|
|
* pci_restore_iov_state - restore the state of the IOV capability
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_restore_iov_state(struct pci_dev *dev)
|
|
{
|
|
if (dev->is_physfn)
|
|
sriov_restore_state(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_iov_bus_range - find bus range used by Virtual Function
|
|
* @bus: the PCI bus
|
|
*
|
|
* Returns max number of buses (exclude current one) used by Virtual
|
|
* Functions.
|
|
*/
|
|
int pci_iov_bus_range(struct pci_bus *bus)
|
|
{
|
|
int max = 0;
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (!dev->is_physfn)
|
|
continue;
|
|
if (dev->sriov->max_VF_buses > max)
|
|
max = dev->sriov->max_VF_buses;
|
|
}
|
|
|
|
return max ? max - bus->number : 0;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_sriov - enable the SR-IOV capability
|
|
* @dev: the PCI device
|
|
* @nr_virtfn: number of virtual functions to enable
|
|
*
|
|
* Returns 0 on success, or negative on failure.
|
|
*/
|
|
int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
|
|
{
|
|
might_sleep();
|
|
|
|
if (!dev->is_physfn)
|
|
return -ENOSYS;
|
|
|
|
return sriov_enable(dev, nr_virtfn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_enable_sriov);
|
|
|
|
/**
|
|
* pci_disable_sriov - disable the SR-IOV capability
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_disable_sriov(struct pci_dev *dev)
|
|
{
|
|
might_sleep();
|
|
|
|
if (!dev->is_physfn)
|
|
return;
|
|
|
|
sriov_disable(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_disable_sriov);
|
|
|
|
/**
|
|
* pci_num_vf - return number of VFs associated with a PF device_release_driver
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns number of VFs, or 0 if SR-IOV is not enabled.
|
|
*/
|
|
int pci_num_vf(struct pci_dev *dev)
|
|
{
|
|
if (!dev->is_physfn)
|
|
return 0;
|
|
|
|
return dev->sriov->num_VFs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_num_vf);
|
|
|
|
/**
|
|
* pci_vfs_assigned - returns number of VFs are assigned to a guest
|
|
* @dev: the PCI device
|
|
*
|
|
* Returns number of VFs belonging to this device that are assigned to a guest.
|
|
* If device is not a physical function returns 0.
|
|
*/
|
|
int pci_vfs_assigned(struct pci_dev *dev)
|
|
{
|
|
struct pci_dev *vfdev;
|
|
unsigned int vfs_assigned = 0;
|
|
unsigned short dev_id;
|
|
|
|
/* only search if we are a PF */
|
|
if (!dev->is_physfn)
|
|
return 0;
|
|
|
|
/*
|
|
* determine the device ID for the VFs, the vendor ID will be the
|
|
* same as the PF so there is no need to check for that one
|
|
*/
|
|
pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id);
|
|
|
|
/* loop through all the VFs to see if we own any that are assigned */
|
|
vfdev = pci_get_device(dev->vendor, dev_id, NULL);
|
|
while (vfdev) {
|
|
/*
|
|
* It is considered assigned if it is a virtual function with
|
|
* our dev as the physical function and the assigned bit is set
|
|
*/
|
|
if (vfdev->is_virtfn && (vfdev->physfn == dev) &&
|
|
pci_is_dev_assigned(vfdev))
|
|
vfs_assigned++;
|
|
|
|
vfdev = pci_get_device(dev->vendor, dev_id, vfdev);
|
|
}
|
|
|
|
return vfs_assigned;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_vfs_assigned);
|
|
|
|
/**
|
|
* pci_sriov_set_totalvfs -- reduce the TotalVFs available
|
|
* @dev: the PCI PF device
|
|
* @numvfs: number that should be used for TotalVFs supported
|
|
*
|
|
* Should be called from PF driver's probe routine with
|
|
* device's mutex held.
|
|
*
|
|
* Returns 0 if PF is an SRIOV-capable device and
|
|
* value of numvfs valid. If not a PF return -ENOSYS;
|
|
* if numvfs is invalid return -EINVAL;
|
|
* if VFs already enabled, return -EBUSY.
|
|
*/
|
|
int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
|
|
{
|
|
if (!dev->is_physfn)
|
|
return -ENOSYS;
|
|
if (numvfs > dev->sriov->total_VFs)
|
|
return -EINVAL;
|
|
|
|
/* Shouldn't change if VFs already enabled */
|
|
if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
|
|
return -EBUSY;
|
|
else
|
|
dev->sriov->driver_max_VFs = numvfs;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
|
|
|
|
/**
|
|
* pci_sriov_get_totalvfs -- get total VFs supported on this device
|
|
* @dev: the PCI PF device
|
|
*
|
|
* For a PCIe device with SRIOV support, return the PCIe
|
|
* SRIOV capability value of TotalVFs or the value of driver_max_VFs
|
|
* if the driver reduced it. Otherwise 0.
|
|
*/
|
|
int pci_sriov_get_totalvfs(struct pci_dev *dev)
|
|
{
|
|
if (!dev->is_physfn)
|
|
return 0;
|
|
|
|
if (dev->sriov->driver_max_VFs)
|
|
return dev->sriov->driver_max_VFs;
|
|
|
|
return dev->sriov->total_VFs;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);
|