diff options
Diffstat (limited to 'arch/s390/pci')
| -rw-r--r-- | arch/s390/pci/Makefile | 1 | ||||
| -rw-r--r-- | arch/s390/pci/pci.c | 59 | ||||
| -rw-r--r-- | arch/s390/pci/pci_bus.c | 66 | ||||
| -rw-r--r-- | arch/s390/pci/pci_bus.h | 13 | ||||
| -rw-r--r-- | arch/s390/pci/pci_clp.c | 85 | ||||
| -rw-r--r-- | arch/s390/pci/pci_event.c | 3 | ||||
| -rw-r--r-- | arch/s390/pci/pci_iov.c | 99 | ||||
| -rw-r--r-- | arch/s390/pci/pci_iov.h | 30 |
8 files changed, 215 insertions, 141 deletions
diff --git a/arch/s390/pci/Makefile b/arch/s390/pci/Makefile index b4e3c84772a1..bf557a1b789c 100644 --- a/arch/s390/pci/Makefile +++ b/arch/s390/pci/Makefile @@ -6,3 +6,4 @@ obj-$(CONFIG_PCI) += pci.o pci_irq.o pci_dma.o pci_clp.o pci_sysfs.o \ pci_event.o pci_debug.o pci_insn.o pci_mmio.o \ pci_bus.o +obj-$(CONFIG_PCI_IOV) += pci_iov.o diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index 1804230dd8d8..570016ae8bcd 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -37,6 +37,7 @@ #include <asm/pci_dma.h> #include "pci_bus.h" +#include "pci_iov.h" /* list of all detected zpci devices */ static LIST_HEAD(zpci_list); @@ -226,7 +227,7 @@ void __iowrite64_copy(void __iomem *to, const void *from, size_t count) zpci_memcpy_toio(to, from, count); } -void __iomem *ioremap(phys_addr_t addr, size_t size) +static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot) { unsigned long offset, vaddr; struct vm_struct *area; @@ -247,14 +248,37 @@ void __iomem *ioremap(phys_addr_t addr, size_t size) return NULL; vaddr = (unsigned long) area->addr; - if (ioremap_page_range(vaddr, vaddr + size, addr, PAGE_KERNEL)) { + if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) { free_vm_area(area); return NULL; } return (void __iomem *) ((unsigned long) area->addr + offset); } + +void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot) +{ + return __ioremap(addr, size, __pgprot(prot)); +} +EXPORT_SYMBOL(ioremap_prot); + +void __iomem *ioremap(phys_addr_t addr, size_t size) +{ + return __ioremap(addr, size, PAGE_KERNEL); +} EXPORT_SYMBOL(ioremap); +void __iomem *ioremap_wc(phys_addr_t addr, size_t size) +{ + return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL)); +} +EXPORT_SYMBOL(ioremap_wc); + +void __iomem *ioremap_wt(phys_addr_t addr, size_t size) +{ + return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL)); +} +EXPORT_SYMBOL(ioremap_wt); + void iounmap(volatile void __iomem *addr) { if (static_branch_likely(&have_mio)) @@ -390,15 +414,6 @@ static struct pci_ops pci_root_ops = { .write = pci_write, }; -#ifdef CONFIG_PCI_IOV -static struct resource iov_res = { - .name = "PCI IOV res", - .start = 0, - .end = -1, - .flags = IORESOURCE_MEM, -}; -#endif - static void zpci_map_resources(struct pci_dev *pdev) { struct zpci_dev *zdev = to_zpci(pdev); @@ -419,16 +434,7 @@ static void zpci_map_resources(struct pci_dev *pdev) pdev->resource[i].end = pdev->resource[i].start + len - 1; } -#ifdef CONFIG_PCI_IOV - for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { - int bar = i + PCI_IOV_RESOURCES; - - len = pci_resource_len(pdev, bar); - if (!len) - continue; - pdev->resource[bar].parent = &iov_res; - } -#endif + zpci_iov_map_resources(pdev); } static void zpci_unmap_resources(struct pci_dev *pdev) @@ -684,7 +690,7 @@ void zpci_remove_device(struct zpci_dev *zdev) pdev = pci_get_slot(zbus->bus, zdev->devfn); if (pdev) { if (pdev->is_virtfn) - return zpci_remove_virtfn(pdev, zdev->vfn); + return zpci_iov_remove_virtfn(pdev, zdev->vfn); pci_stop_and_remove_bus_device_locked(pdev); } } @@ -788,6 +794,9 @@ static int zpci_mem_init(void) if (!zpci_iomap_bitmap) goto error_iomap_bitmap; + if (static_branch_likely(&have_mio)) + clp_setup_writeback_mio(); + return 0; error_iomap_bitmap: kfree(zpci_iomap_start); @@ -885,9 +894,3 @@ out: return rc; } subsys_initcall_sync(pci_base_init); - -void zpci_rescan(void) -{ - if (zpci_is_enabled()) - clp_rescan_pci_devices_simple(NULL); -} diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c index 5967f3014156..0c0db7c3a404 100644 --- a/arch/s390/pci/pci_bus.c +++ b/arch/s390/pci/pci_bus.c @@ -24,6 +24,7 @@ #include <asm/pci_dma.h> #include "pci_bus.h" +#include "pci_iov.h" static LIST_HEAD(zbus_list); static DEFINE_SPINLOCK(zbus_list_lock); @@ -126,69 +127,6 @@ static struct zpci_bus *zpci_bus_alloc(int pchid) return zbus; } -#ifdef CONFIG_PCI_IOV -static int zpci_bus_link_virtfn(struct pci_dev *pdev, - struct pci_dev *virtfn, int vfid) -{ - int rc; - - rc = pci_iov_sysfs_link(pdev, virtfn, vfid); - if (rc) - return rc; - - virtfn->is_virtfn = 1; - virtfn->multifunction = 0; - virtfn->physfn = pci_dev_get(pdev); - - return 0; -} - -static int zpci_bus_setup_virtfn(struct zpci_bus *zbus, - struct pci_dev *virtfn, int vfn) -{ - int i, cand_devfn; - struct zpci_dev *zdev; - struct pci_dev *pdev; - int vfid = vfn - 1; /* Linux' vfid's start at 0 vfn at 1*/ - int rc = 0; - - if (!zbus->multifunction) - return 0; - - /* If the parent PF for the given VF is also configured in the - * instance, it must be on the same zbus. - * We can then identify the parent PF by checking what - * devfn the VF would have if it belonged to that PF using the PF's - * stride and offset. Only if this candidate devfn matches the - * actual devfn will we link both functions. - */ - for (i = 0; i < ZPCI_FUNCTIONS_PER_BUS; i++) { - zdev = zbus->function[i]; - if (zdev && zdev->is_physfn) { - pdev = pci_get_slot(zbus->bus, zdev->devfn); - if (!pdev) - continue; - cand_devfn = pci_iov_virtfn_devfn(pdev, vfid); - if (cand_devfn == virtfn->devfn) { - rc = zpci_bus_link_virtfn(pdev, virtfn, vfid); - /* balance pci_get_slot() */ - pci_dev_put(pdev); - break; - } - /* balance pci_get_slot() */ - pci_dev_put(pdev); - } - } - return rc; -} -#else -static inline int zpci_bus_setup_virtfn(struct zpci_bus *zbus, - struct pci_dev *virtfn, int vfn) -{ - return 0; -} -#endif - void pcibios_bus_add_device(struct pci_dev *pdev) { struct zpci_dev *zdev = to_zpci(pdev); @@ -198,7 +136,7 @@ void pcibios_bus_add_device(struct pci_dev *pdev) * perform PF/VF linking. */ if (zdev->vfn) - zpci_bus_setup_virtfn(zdev->zbus, pdev, zdev->vfn); + zpci_iov_setup_virtfn(zdev->zbus, pdev, zdev->vfn); } diff --git a/arch/s390/pci/pci_bus.h b/arch/s390/pci/pci_bus.h index 4972433df458..f8dfac0b5b71 100644 --- a/arch/s390/pci/pci_bus.h +++ b/arch/s390/pci/pci_bus.h @@ -9,7 +9,6 @@ int zpci_bus_device_register(struct zpci_dev *zdev, struct pci_ops *ops); void zpci_bus_device_unregister(struct zpci_dev *zdev); -int zpci_bus_init(void); void zpci_release_device(struct kref *kref); static inline void zpci_zdev_put(struct zpci_dev *zdev) @@ -30,15 +29,3 @@ static inline struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus, return (devfn >= ZPCI_FUNCTIONS_PER_BUS) ? NULL : zbus->function[devfn]; } -#ifdef CONFIG_PCI_IOV -static inline void zpci_remove_virtfn(struct pci_dev *pdev, int vfn) -{ - - pci_lock_rescan_remove(); - /* Linux' vfid's start at 0 vfn at 1 */ - pci_iov_remove_virtfn(pdev->physfn, vfn - 1); - pci_unlock_rescan_remove(); -} -#else /* CONFIG_PCI_IOV */ -static inline void zpci_remove_virtfn(struct pci_dev *pdev, int vfn) {} -#endif /* CONFIG_PCI_IOV */ diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c index 7e735f41a0a6..5a34a1359dc5 100644 --- a/arch/s390/pci/pci_clp.c +++ b/arch/s390/pci/pci_clp.c @@ -244,6 +244,7 @@ error: return rc; } +static int clp_refresh_fh(u32 fid); /* * Enable/Disable a given PCI function and update its function handle if * necessary @@ -286,7 +287,41 @@ static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command) } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY && rrb->response.fh == 0) { /* Function is already in desired state - update handle */ - rc = clp_rescan_pci_devices_simple(&fid); + rc = clp_refresh_fh(fid); + } + clp_free_block(rrb); + return rc; +} + +int clp_setup_writeback_mio(void) +{ + struct clp_req_rsp_slpc_pci *rrb; + u8 wb_bit_pos; + int rc; + + rrb = clp_alloc_block(GFP_KERNEL); + if (!rrb) + return -ENOMEM; + + memset(rrb, 0, sizeof(*rrb)); + rrb->request.hdr.len = sizeof(rrb->request); + rrb->request.hdr.cmd = CLP_SLPC; + rrb->response.hdr.len = sizeof(rrb->response); + + rc = clp_req(rrb, CLP_LPS_PCI); + if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) { + if (rrb->response.vwb) { + wb_bit_pos = rrb->response.mio_wb; + set_bit_inv(wb_bit_pos, &mio_wb_bit_mask); + zpci_dbg(3, "wb bit: %d\n", wb_bit_pos); + } else { + zpci_dbg(3, "wb bit: n.a.\n"); + } + + } else { + zpci_err("SLPC PCI:\n"); + zpci_err_clp(rrb->response.hdr.rsp, rc); + rc = -EIO; } clp_free_block(rrb); return rc; @@ -374,24 +409,6 @@ static void __clp_add(struct clp_fh_list_entry *entry, void *data) clp_add_pci_device(entry->fid, entry->fh, entry->config_state); } -static void __clp_update(struct clp_fh_list_entry *entry, void *data) -{ - struct zpci_dev *zdev; - u32 *fid = data; - - if (!entry->vendor_id) - return; - - if (fid && *fid != entry->fid) - return; - - zdev = get_zdev_by_fid(entry->fid); - if (!zdev) - return; - - zdev->fh = entry->fh; -} - int clp_scan_pci_devices(void) { struct clp_req_rsp_list_pci *rrb; @@ -407,27 +424,25 @@ int clp_scan_pci_devices(void) return rc; } -int clp_rescan_pci_devices(void) +static void __clp_refresh_fh(struct clp_fh_list_entry *entry, void *data) { - struct clp_req_rsp_list_pci *rrb; - int rc; - - zpci_remove_reserved_devices(); + struct zpci_dev *zdev; + u32 fid = *((u32 *)data); - rrb = clp_alloc_block(GFP_KERNEL); - if (!rrb) - return -ENOMEM; + if (!entry->vendor_id || fid != entry->fid) + return; - rc = clp_list_pci(rrb, NULL, __clp_add); + zdev = get_zdev_by_fid(fid); + if (!zdev) + return; - clp_free_block(rrb); - return rc; + zdev->fh = entry->fh; } -/* Rescan PCI functions and refresh function handles. If fid is non-NULL only - * refresh the handle of the function matching @fid +/* + * Refresh the function handle of the function matching @fid */ -int clp_rescan_pci_devices_simple(u32 *fid) +static int clp_refresh_fh(u32 fid) { struct clp_req_rsp_list_pci *rrb; int rc; @@ -436,7 +451,7 @@ int clp_rescan_pci_devices_simple(u32 *fid) if (!rrb) return -ENOMEM; - rc = clp_list_pci(rrb, fid, __clp_update); + rc = clp_list_pci(rrb, &fid, __clp_refresh_fh); clp_free_block(rrb); return rc; @@ -495,7 +510,7 @@ static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb) } } -static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb) +static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc_pci *lpcb) { unsigned long limit = PAGE_SIZE - sizeof(lpcb->request); diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c index d9ae7456dd4c..d33f21545dfd 100644 --- a/arch/s390/pci/pci_event.c +++ b/arch/s390/pci/pci_event.c @@ -152,7 +152,8 @@ static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf) } break; case 0x0306: /* 0x308 or 0x302 for multiple devices */ - clp_rescan_pci_devices(); + zpci_remove_reserved_devices(); + clp_scan_pci_devices(); break; case 0x0308: /* Standby -> Reserved */ if (!zdev) diff --git a/arch/s390/pci/pci_iov.c b/arch/s390/pci/pci_iov.c new file mode 100644 index 000000000000..ead062bf2b41 --- /dev/null +++ b/arch/s390/pci/pci_iov.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2020 + * + * Author(s): + * Niklas Schnelle <schnelle@linux.ibm.com> + * + */ + +#define KMSG_COMPONENT "zpci" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/kernel.h> +#include <linux/pci.h> + +#include "pci_iov.h" + +static struct resource iov_res = { + .name = "PCI IOV res", + .start = 0, + .end = -1, + .flags = IORESOURCE_MEM, +}; + +void zpci_iov_map_resources(struct pci_dev *pdev) +{ + resource_size_t len; + int i; + + for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { + int bar = i + PCI_IOV_RESOURCES; + + len = pci_resource_len(pdev, bar); + if (!len) + continue; + pdev->resource[bar].parent = &iov_res; + } +} + +void zpci_iov_remove_virtfn(struct pci_dev *pdev, int vfn) +{ + pci_lock_rescan_remove(); + /* Linux' vfid's start at 0 vfn at 1 */ + pci_iov_remove_virtfn(pdev->physfn, vfn - 1); + pci_unlock_rescan_remove(); +} + +static int zpci_iov_link_virtfn(struct pci_dev *pdev, struct pci_dev *virtfn, int vfid) +{ + int rc; + + rc = pci_iov_sysfs_link(pdev, virtfn, vfid); + if (rc) + return rc; + + virtfn->is_virtfn = 1; + virtfn->multifunction = 0; + virtfn->physfn = pci_dev_get(pdev); + + return 0; +} + +int zpci_iov_setup_virtfn(struct zpci_bus *zbus, struct pci_dev *virtfn, int vfn) +{ + int i, cand_devfn; + struct zpci_dev *zdev; + struct pci_dev *pdev; + int vfid = vfn - 1; /* Linux' vfid's start at 0 vfn at 1*/ + int rc = 0; + + if (!zbus->multifunction) + return 0; + + /* If the parent PF for the given VF is also configured in the + * instance, it must be on the same zbus. + * We can then identify the parent PF by checking what + * devfn the VF would have if it belonged to that PF using the PF's + * stride and offset. Only if this candidate devfn matches the + * actual devfn will we link both functions. + */ + for (i = 0; i < ZPCI_FUNCTIONS_PER_BUS; i++) { + zdev = zbus->function[i]; + if (zdev && zdev->is_physfn) { + pdev = pci_get_slot(zbus->bus, zdev->devfn); + if (!pdev) + continue; + cand_devfn = pci_iov_virtfn_devfn(pdev, vfid); + if (cand_devfn == virtfn->devfn) { + rc = zpci_iov_link_virtfn(pdev, virtfn, vfid); + /* balance pci_get_slot() */ + pci_dev_put(pdev); + break; + } + /* balance pci_get_slot() */ + pci_dev_put(pdev); + } + } + return rc; +} diff --git a/arch/s390/pci/pci_iov.h b/arch/s390/pci/pci_iov.h new file mode 100644 index 000000000000..b2c828003bad --- /dev/null +++ b/arch/s390/pci/pci_iov.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2020 + * + * Author(s): + * Niklas Schnelle <schnelle@linux.ibm.com> + * + */ + +#ifndef __S390_PCI_IOV_H +#define __S390_PCI_IOV_H + +#ifdef CONFIG_PCI_IOV +void zpci_iov_remove_virtfn(struct pci_dev *pdev, int vfn); + +void zpci_iov_map_resources(struct pci_dev *pdev); + +int zpci_iov_setup_virtfn(struct zpci_bus *zbus, struct pci_dev *virtfn, int vfn); + +#else /* CONFIG_PCI_IOV */ +static inline void zpci_iov_remove_virtfn(struct pci_dev *pdev, int vfn) {} + +static inline void zpci_iov_map_resources(struct pci_dev *pdev) {} + +static inline int zpci_iov_setup_virtfn(struct zpci_bus *zbus, struct pci_dev *virtfn, int vfn) +{ + return 0; +} +#endif /* CONFIG_PCI_IOV */ +#endif /* __S390_PCI_IOV_h */ |