From fb794a708a71d7c6af55f04cc4ed2d5823fb8b33 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Wed, 25 Sep 2019 11:16:55 +1000 Subject: PCI: Protect pci_reassign_bridge_resources() against concurrent addition/removal pci_reassign_bridge_resources() can be called by pci_resize_resource() at runtime, it walks the PCI tree up and down, and it isn't currently protected against any changes or hotplug operation. Hold the pci_bus_sem to protect it. Link: https://lore.kernel.org/r/7339fd73ccaf58552737ab10008333fd9f7723f2.camel@kernel.crashing.org Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Bjorn Helgaas --- drivers/pci/setup-bus.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'drivers/pci') diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index e7dbe21705ba..f1c51943bdfc 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -2066,6 +2066,8 @@ int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type) unsigned int i; int ret; + down_read(&pci_bus_sem); + /* Walk to the root hub, releasing bridge BARs when possible */ next = bridge; do { @@ -2100,8 +2102,10 @@ int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type) next = bridge->bus ? bridge->bus->self : NULL; } while (next); - if (list_empty(&saved)) + if (list_empty(&saved)) { + up_read(&pci_bus_sem); return -ENOENT; + } __pci_bus_size_bridges(bridge->subordinate, &added); __pci_bridge_assign_resources(bridge, &added, &failed); @@ -2122,6 +2126,7 @@ int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type) } free_list(&saved); + up_read(&pci_bus_sem); return 0; cleanup: @@ -2150,6 +2155,7 @@ cleanup: pci_setup_bridge(bridge->subordinate); } free_list(&saved); + up_read(&pci_bus_sem); return ret; } -- cgit From 7608158df3ed87a5c938c4a0b91f5b11101a9be1 Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Mon, 7 Oct 2019 20:23:25 -0500 Subject: PCI: Fix missing bridge dma_ranges resource list cleanup Commit e80a91ad302b ("PCI: Add dma_ranges window list") added a dma_ranges resource list, but failed to correctly free the list when devm_pci_alloc_host_bridge() is used. Only the iproc host bridge driver is using the dma_ranges list. Fixes: e80a91ad302b ("PCI: Add dma_ranges window list") Link: https://lore.kernel.org/r/20191008012325.25700-1-robh@kernel.org Signed-off-by: Rob Herring Signed-off-by: Bjorn Helgaas Cc: Srinath Mannam --- drivers/pci/probe.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/pci') diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 3d5271a7a849..bdbc8490f962 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -572,6 +572,7 @@ static void devm_pci_release_host_bridge_dev(struct device *dev) bridge->release_fn(bridge); pci_free_resource_list(&bridge->windows); + pci_free_resource_list(&bridge->dma_ranges); } static void pci_release_host_bridge_dev(struct device *dev) -- cgit From c9c13ba428ef90a9b408a6cdf874e14ab5754516 Mon Sep 17 00:00:00 2001 From: Denis Efremov Date: Sat, 28 Sep 2019 02:43:08 +0300 Subject: PCI: Add PCI_STD_NUM_BARS for the number of standard BARs Code that iterates over all standard PCI BARs typically uses PCI_STD_RESOURCE_END. However, that requires the unusual test "i <= PCI_STD_RESOURCE_END" rather than something the typical "i < PCI_STD_NUM_BARS". Add a definition for PCI_STD_NUM_BARS and change loops to use the more idiomatic C style to help avoid fencepost errors. Link: https://lore.kernel.org/r/20190927234026.23342-1-efremov@linux.com Link: https://lore.kernel.org/r/20190927234308.23935-1-efremov@linux.com Link: https://lore.kernel.org/r/20190916204158.6889-3-efremov@linux.com Signed-off-by: Denis Efremov Signed-off-by: Bjorn Helgaas Acked-by: Sebastian Ott # arch/s390/ Acked-by: Bartlomiej Zolnierkiewicz # video/fbdev/ Acked-by: Gustavo Pimentel # pci/controller/dwc/ Acked-by: Jack Wang # scsi/pm8001/ Acked-by: Martin K. Petersen # scsi/pm8001/ Acked-by: Ulf Hansson # memstick/ --- drivers/pci/controller/dwc/pci-dra7xx.c | 2 +- drivers/pci/controller/dwc/pci-layerscape-ep.c | 2 +- drivers/pci/controller/dwc/pcie-artpec6.c | 2 +- drivers/pci/controller/dwc/pcie-designware-plat.c | 2 +- drivers/pci/controller/dwc/pcie-designware.h | 2 +- drivers/pci/controller/pci-hyperv.c | 10 +++++----- drivers/pci/endpoint/functions/pci-epf-test.c | 10 +++++----- drivers/pci/pci-sysfs.c | 4 ++-- drivers/pci/pci.c | 13 +++++++------ drivers/pci/proc.c | 4 ++-- drivers/pci/quirks.c | 4 ++-- 11 files changed, 28 insertions(+), 27 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c index 4234ddb4722f..b20651cea09f 100644 --- a/drivers/pci/controller/dwc/pci-dra7xx.c +++ b/drivers/pci/controller/dwc/pci-dra7xx.c @@ -353,7 +353,7 @@ static void dra7xx_pcie_ep_init(struct dw_pcie_ep *ep) struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci); enum pci_barno bar; - for (bar = BAR_0; bar <= BAR_5; bar++) + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) dw_pcie_ep_reset_bar(pci, bar); dra7xx_pcie_enable_wrapper_interrupts(dra7xx); diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c index ca9aa4501e7e..0d151cead1b7 100644 --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c @@ -58,7 +58,7 @@ static void ls_pcie_ep_init(struct dw_pcie_ep *ep) struct dw_pcie *pci = to_dw_pcie_from_ep(ep); enum pci_barno bar; - for (bar = BAR_0; bar <= BAR_5; bar++) + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) dw_pcie_ep_reset_bar(pci, bar); } diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c index d00252bd8fae..9e2482bd7b6d 100644 --- a/drivers/pci/controller/dwc/pcie-artpec6.c +++ b/drivers/pci/controller/dwc/pcie-artpec6.c @@ -422,7 +422,7 @@ static void artpec6_pcie_ep_init(struct dw_pcie_ep *ep) artpec6_pcie_wait_for_phy(artpec6_pcie); artpec6_pcie_set_nfts(artpec6_pcie); - for (bar = BAR_0; bar <= BAR_5; bar++) + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) dw_pcie_ep_reset_bar(pci, bar); } diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c index b58fdcbc664b..73646b677aff 100644 --- a/drivers/pci/controller/dwc/pcie-designware-plat.c +++ b/drivers/pci/controller/dwc/pcie-designware-plat.c @@ -70,7 +70,7 @@ static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep) struct dw_pcie *pci = to_dw_pcie_from_ep(ep); enum pci_barno bar; - for (bar = BAR_0; bar <= BAR_5; bar++) + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) dw_pcie_ep_reset_bar(pci, bar); } diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 5a18e94e52c8..5accdd6bc388 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -214,7 +214,7 @@ struct dw_pcie_ep { phys_addr_t phys_base; size_t addr_size; size_t page_size; - u8 bar_to_atu[6]; + u8 bar_to_atu[PCI_STD_NUM_BARS]; phys_addr_t *outbound_addr; unsigned long *ib_window_map; unsigned long *ob_window_map; diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index f1f300218fab..ad40e848d564 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -307,7 +307,7 @@ struct pci_bus_relations { struct pci_q_res_req_response { struct vmpacket_descriptor hdr; s32 status; /* negative values are failures */ - u32 probed_bar[6]; + u32 probed_bar[PCI_STD_NUM_BARS]; } __packed; struct pci_set_power { @@ -539,7 +539,7 @@ struct hv_pci_dev { * What would be observed if one wrote 0xFFFFFFFF to a BAR and then * read it back, for each of the BAR offsets within config space. */ - u32 probed_bar[6]; + u32 probed_bar[PCI_STD_NUM_BARS]; }; struct hv_pci_compl { @@ -1610,7 +1610,7 @@ static void survey_child_resources(struct hv_pcibus_device *hbus) * so it's sufficient to just add them up without tracking alignment. */ list_for_each_entry(hpdev, &hbus->children, list_entry) { - for (i = 0; i < 6; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { if (hpdev->probed_bar[i] & PCI_BASE_ADDRESS_SPACE_IO) dev_err(&hbus->hdev->device, "There's an I/O BAR in this list!\n"); @@ -1684,7 +1684,7 @@ static void prepopulate_bars(struct hv_pcibus_device *hbus) /* Pick addresses for the BARs. */ do { list_for_each_entry(hpdev, &hbus->children, list_entry) { - for (i = 0; i < 6; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { bar_val = hpdev->probed_bar[i]; if (bar_val == 0) continue; @@ -1841,7 +1841,7 @@ static void q_resource_requirements(void *context, struct pci_response *resp, "query resource requirements failed: %x\n", resp->status); } else { - for (i = 0; i < 6; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { completion->hpdev->probed_bar[i] = q_res_req->probed_bar[i]; } diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 1cfe3687a211..5d74f81ddfe4 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -44,7 +44,7 @@ static struct workqueue_struct *kpcitest_workqueue; struct pci_epf_test { - void *reg[6]; + void *reg[PCI_STD_NUM_BARS]; struct pci_epf *epf; enum pci_barno test_reg_bar; struct delayed_work cmd_handler; @@ -377,7 +377,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf) cancel_delayed_work(&epf_test->cmd_handler); pci_epc_stop(epc); - for (bar = BAR_0; bar <= BAR_5; bar++) { + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) { epf_bar = &epf->bar[bar]; if (epf_test->reg[bar]) { @@ -400,7 +400,7 @@ static int pci_epf_test_set_bar(struct pci_epf *epf) epc_features = epf_test->epc_features; - for (bar = BAR_0; bar <= BAR_5; bar += add) { + for (bar = 0; bar < PCI_STD_NUM_BARS; bar += add) { epf_bar = &epf->bar[bar]; /* * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64 @@ -450,7 +450,7 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf) } epf_test->reg[test_reg_bar] = base; - for (bar = BAR_0; bar <= BAR_5; bar += add) { + for (bar = 0; bar < PCI_STD_NUM_BARS; bar += add) { epf_bar = &epf->bar[bar]; add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1; @@ -478,7 +478,7 @@ static void pci_epf_configure_bar(struct pci_epf *epf, bool bar_fixed_64bit; int i; - for (i = BAR_0; i <= BAR_5; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { epf_bar = &epf->bar[i]; bar_fixed_64bit = !!(epc_features->bar_fixed_64bit & (1 << i)); if (bar_fixed_64bit) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 793412954529..07bd84c50238 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1122,7 +1122,7 @@ static void pci_remove_resource_files(struct pci_dev *pdev) { int i; - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { struct bin_attribute *res_attr; res_attr = pdev->res_attr[i]; @@ -1193,7 +1193,7 @@ static int pci_create_resource_files(struct pci_dev *pdev) int retval; /* Expose the PCI resources from this device as files */ - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { /* skip empty resources */ if (!pci_resource_len(pdev, i)) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e7982af9a5d8..184765f12848 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -674,7 +674,7 @@ struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res) { int i; - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { struct resource *r = &dev->resource[i]; if (r->start && resource_contains(r, res)) @@ -3768,7 +3768,7 @@ void pci_release_selected_regions(struct pci_dev *pdev, int bars) { int i; - for (i = 0; i < 6; i++) + for (i = 0; i < PCI_STD_NUM_BARS; i++) if (bars & (1 << i)) pci_release_region(pdev, i); } @@ -3779,7 +3779,7 @@ static int __pci_request_selected_regions(struct pci_dev *pdev, int bars, { int i; - for (i = 0; i < 6; i++) + for (i = 0; i < PCI_STD_NUM_BARS; i++) if (bars & (1 << i)) if (__pci_request_region(pdev, i, res_name, excl)) goto err_out; @@ -3827,7 +3827,7 @@ EXPORT_SYMBOL(pci_request_selected_regions_exclusive); void pci_release_regions(struct pci_dev *pdev) { - pci_release_selected_regions(pdev, (1 << 6) - 1); + pci_release_selected_regions(pdev, (1 << PCI_STD_NUM_BARS) - 1); } EXPORT_SYMBOL(pci_release_regions); @@ -3846,7 +3846,8 @@ EXPORT_SYMBOL(pci_release_regions); */ int pci_request_regions(struct pci_dev *pdev, const char *res_name) { - return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); + return pci_request_selected_regions(pdev, + ((1 << PCI_STD_NUM_BARS) - 1), res_name); } EXPORT_SYMBOL(pci_request_regions); @@ -3868,7 +3869,7 @@ EXPORT_SYMBOL(pci_request_regions); int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) { return pci_request_selected_regions_exclusive(pdev, - ((1 << 6) - 1), res_name); + ((1 << PCI_STD_NUM_BARS) - 1), res_name); } EXPORT_SYMBOL(pci_request_regions_exclusive); diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index 5495537c60c2..6ef74bf5013f 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -258,13 +258,13 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) } /* Make sure the caller is mapping a real resource for this device */ - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { if (dev->resource[i].flags & res_bit && pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) break; } - if (i >= PCI_ROM_RESOURCE) + if (i >= PCI_STD_NUM_BARS) return -ENODEV; if (fpriv->mmap_state == pci_mmap_mem && diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 320255e5e8f8..5d5e6f2f7837 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -474,7 +474,7 @@ static void quirk_extend_bar_to_page(struct pci_dev *dev) { int i; - for (i = 0; i <= PCI_STD_RESOURCE_END; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { struct resource *r = &dev->resource[i]; if (r->flags & IORESOURCE_MEM && resource_size(r) < PAGE_SIZE) { @@ -1809,7 +1809,7 @@ static void quirk_alder_ioapic(struct pci_dev *pdev) * The next five BARs all seem to be rubbish, so just clean * them out. */ - for (i = 1; i < 6; i++) + for (i = 1; i < PCI_STD_NUM_BARS; i++) memset(&pdev->resource[i], 0, sizeof(pdev->resource[i])); } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EESSC, quirk_alder_ioapic); -- cgit From d7b8a217521ca21e2c6391da88d4928c6ce1f539 Mon Sep 17 00:00:00 2001 From: Nicholas Johnson Date: Wed, 23 Oct 2019 12:12:29 +0000 Subject: PCI: Add "pci=hpmmiosize" and "pci=hpmmioprefsize" parameters The existing "pci=hpmemsize=nn[KMG]" kernel parameter overrides the default size of both the non-prefetchable and the prefetchable MMIO windows for hotplug bridges. Add "pci=hpmmiosize=nn[KMG]" to override the default size of only the non-prefetchable MMIO window. Add "pci=hpmmioprefsize=nn[KMG]" to override the default size of only the prefetchable MMIO window. Link: https://lore.kernel.org/r/SL2P216MB0187E4D0055791957B7E2660806B0@SL2P216MB0187.KORP216.PROD.OUTLOOK.COM Signed-off-by: Nicholas Johnson Signed-off-by: Bjorn Helgaas Reviewed-by: Mika Westerberg --- drivers/pci/pci.c | 20 ++++++++++++++++---- drivers/pci/pci.h | 3 ++- drivers/pci/setup-bus.c | 24 +++++++++++++----------- 3 files changed, 31 insertions(+), 16 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 184765f12848..66ff1ca5b688 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -85,10 +85,17 @@ unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE; unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE; #define DEFAULT_HOTPLUG_IO_SIZE (256) -#define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024) -/* pci=hpmemsize=nnM,hpiosize=nn can override this */ +#define DEFAULT_HOTPLUG_MMIO_SIZE (2*1024*1024) +#define DEFAULT_HOTPLUG_MMIO_PREF_SIZE (2*1024*1024) +/* hpiosize=nn can override this */ unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE; -unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE; +/* + * pci=hpmmiosize=nnM overrides non-prefetchable MMIO size, + * pci=hpmmioprefsize=nnM overrides prefetchable MMIO size; + * pci=hpmemsize=nnM overrides both + */ +unsigned long pci_hotplug_mmio_size = DEFAULT_HOTPLUG_MMIO_SIZE; +unsigned long pci_hotplug_mmio_pref_size = DEFAULT_HOTPLUG_MMIO_PREF_SIZE; #define DEFAULT_HOTPLUG_BUS_SIZE 1 unsigned long pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE; @@ -6289,8 +6296,13 @@ static int __init pci_setup(char *str) pcie_ecrc_get_policy(str + 5); } else if (!strncmp(str, "hpiosize=", 9)) { pci_hotplug_io_size = memparse(str + 9, &str); + } else if (!strncmp(str, "hpmmiosize=", 11)) { + pci_hotplug_mmio_size = memparse(str + 11, &str); + } else if (!strncmp(str, "hpmmioprefsize=", 15)) { + pci_hotplug_mmio_pref_size = memparse(str + 15, &str); } else if (!strncmp(str, "hpmemsize=", 10)) { - pci_hotplug_mem_size = memparse(str + 10, &str); + pci_hotplug_mmio_size = memparse(str + 10, &str); + pci_hotplug_mmio_pref_size = pci_hotplug_mmio_size; } else if (!strncmp(str, "hpbussize=", 10)) { pci_hotplug_bus_size = simple_strtoul(str + 10, &str, 0); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 3f6947ee3324..9faa55a151cb 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -218,7 +218,8 @@ extern const struct device_type pci_dev_type; extern const struct attribute_group *pci_bus_groups[]; extern unsigned long pci_hotplug_io_size; -extern unsigned long pci_hotplug_mem_size; +extern unsigned long pci_hotplug_mmio_size; +extern unsigned long pci_hotplug_mmio_pref_size; extern unsigned long pci_hotplug_bus_size; /** diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index f1c51943bdfc..b5f9f57f436a 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1178,7 +1178,8 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) { struct pci_dev *dev; unsigned long mask, prefmask, type2 = 0, type3 = 0; - resource_size_t additional_mem_size = 0, additional_io_size = 0; + resource_size_t additional_io_size = 0, additional_mmio_size = 0, + additional_mmio_pref_size = 0; struct resource *b_res; int ret; @@ -1212,7 +1213,8 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) pci_bridge_check_ranges(bus); if (bus->self->is_hotplug_bridge) { additional_io_size = pci_hotplug_io_size; - additional_mem_size = pci_hotplug_mem_size; + additional_mmio_size = pci_hotplug_mmio_size; + additional_mmio_pref_size = pci_hotplug_mmio_pref_size; } /* Fall through */ default: @@ -1230,9 +1232,9 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) if (b_res[2].flags & IORESOURCE_MEM_64) { prefmask |= IORESOURCE_MEM_64; ret = pbus_size_mem(bus, prefmask, prefmask, - prefmask, prefmask, - realloc_head ? 0 : additional_mem_size, - additional_mem_size, realloc_head); + prefmask, prefmask, + realloc_head ? 0 : additional_mmio_pref_size, + additional_mmio_pref_size, realloc_head); /* * If successful, all non-prefetchable resources @@ -1254,9 +1256,9 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) if (!type2) { prefmask &= ~IORESOURCE_MEM_64; ret = pbus_size_mem(bus, prefmask, prefmask, - prefmask, prefmask, - realloc_head ? 0 : additional_mem_size, - additional_mem_size, realloc_head); + prefmask, prefmask, + realloc_head ? 0 : additional_mmio_pref_size, + additional_mmio_pref_size, realloc_head); /* * If successful, only non-prefetchable resources @@ -1265,7 +1267,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) if (ret == 0) mask = prefmask; else - additional_mem_size += additional_mem_size; + additional_mmio_size += additional_mmio_pref_size; type2 = type3 = IORESOURCE_MEM; } @@ -1285,8 +1287,8 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) * prefetchable resource in a 64-bit prefetchable window. */ pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3, - realloc_head ? 0 : additional_mem_size, - additional_mem_size, realloc_head); + realloc_head ? 0 : additional_mmio_size, + additional_mmio_size, realloc_head); break; } } -- cgit From c13704f5685deb7d6eb21e293233e0901ed77377 Mon Sep 17 00:00:00 2001 From: Nicholas Johnson Date: Wed, 13 Nov 2019 15:25:28 +0000 Subject: PCI: Avoid double hpmemsize MMIO window assignment Previously, the kernel sometimes assigned more MMIO or MMIO_PREF space than desired. For example, if the user requested 128M of space with "pci=realloc,hpmemsize=128M", we sometimes assigned 256M: pci 0000:06:01.0: BAR 14: assigned [mem 0x90100000-0xa00fffff] = 256M pci 0000:06:04.0: BAR 14: assigned [mem 0xa0200000-0xb01fffff] = 256M With this patch applied: pci 0000:06:01.0: BAR 14: assigned [mem 0x90100000-0x980fffff] = 128M pci 0000:06:04.0: BAR 14: assigned [mem 0x98200000-0xa01fffff] = 128M This happened when in the first pass, the MMIO_PREF succeeded but the MMIO failed. In the next pass, because MMIO_PREF was already assigned, the attempt to assign MMIO_PREF returned an error code instead of success (nothing more to do, already allocated). Hence, the size which was actually allocated, but thought to have failed, was placed in the MMIO window. The bug resulted in the MMIO_PREF being added to the MMIO window, which meant doubling if MMIO_PREF size = MMIO size. With a large MMIO_PREF, the MMIO window would likely fail to be assigned altogether due to lack of 32-bit address space. Change find_free_bus_resource() to do the following: - Return first unassigned resource of the correct type. - If there is none, return first assigned resource of the correct type. - If none of the above, return NULL. Returning an assigned resource of the correct type allows the caller to distinguish between already assigned and no resource of the correct type. Add checks in pbus_size_io() and pbus_size_mem() to return success if resource returned from find_free_bus_resource() is already allocated. This avoids pbus_size_io() and pbus_size_mem() returning error code to __pci_bus_size_bridges() when a resource has been successfully assigned in a previous pass. This fixes the existing behaviour where space for a resource could be reserved multiple times in different parent bridge windows. Link: https://lore.kernel.org/lkml/20190531171216.20532-2-logang@deltatee.com/T/#u Link: https://bugzilla.kernel.org/show_bug.cgi?id=203243 Link: https://lore.kernel.org/r/PS2P216MB075563AA6AD242AA666EDC6A80760@PS2P216MB0755.KORP216.PROD.OUTLOOK.COM Reported-by: Kit Chow Reported-by: Nicholas Johnson Signed-off-by: Nicholas Johnson Signed-off-by: Bjorn Helgaas Reviewed-by: Mika Westerberg Reviewed-by: Logan Gunthorpe --- drivers/pci/setup-bus.c | 38 +++++++++++++++++++++++++++----------- 1 file changed, 27 insertions(+), 11 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index b5f9f57f436a..f279826204eb 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -752,24 +752,32 @@ static void pci_bridge_check_ranges(struct pci_bus *bus) } /* - * Helper function for sizing routines: find first available bus resource - * of a given type. Note: we intentionally skip the bus resources which - * have already been assigned (that is, have non-NULL parent resource). + * Helper function for sizing routines. Assigned resources have non-NULL + * parent resource. + * + * Return first unassigned resource of the correct type. If there is none, + * return first assigned resource of the correct type. If none of the + * above, return NULL. + * + * Returning an assigned resource of the correct type allows the caller to + * distinguish between already assigned and no resource of the correct type. */ -static struct resource *find_free_bus_resource(struct pci_bus *bus, - unsigned long type_mask, - unsigned long type) +static struct resource *find_bus_resource_of_type(struct pci_bus *bus, + unsigned long type_mask, + unsigned long type) { + struct resource *r, *r_assigned = NULL; int i; - struct resource *r; pci_bus_for_each_resource(bus, r, i) { if (r == &ioport_resource || r == &iomem_resource) continue; if (r && (r->flags & type_mask) == type && !r->parent) return r; + if (r && (r->flags & type_mask) == type && !r_assigned) + r_assigned = r; } - return NULL; + return r_assigned; } static resource_size_t calculate_iosize(resource_size_t size, @@ -866,8 +874,8 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, struct list_head *realloc_head) { struct pci_dev *dev; - struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO, - IORESOURCE_IO); + struct resource *b_res = find_bus_resource_of_type(bus, IORESOURCE_IO, + IORESOURCE_IO); resource_size_t size = 0, size0 = 0, size1 = 0; resource_size_t children_add_size = 0; resource_size_t min_align, align; @@ -875,6 +883,10 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, if (!b_res) return; + /* If resource is already assigned, nothing more to do */ + if (b_res->parent) + return; + min_align = window_alignment(bus, IORESOURCE_IO); list_for_each_entry(dev, &bus->devices, bus_list) { int i; @@ -978,7 +990,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, resource_size_t min_align, align, size, size0, size1; resource_size_t aligns[18]; /* Alignments from 1MB to 128GB */ int order, max_order; - struct resource *b_res = find_free_bus_resource(bus, + struct resource *b_res = find_bus_resource_of_type(bus, mask | IORESOURCE_PREFETCH, type); resource_size_t children_add_size = 0; resource_size_t children_add_align = 0; @@ -987,6 +999,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, if (!b_res) return -ENOSPC; + /* If resource is already assigned, nothing more to do */ + if (b_res->parent) + return 0; + memset(aligns, 0, sizeof(aligns)); max_order = 0; size = 0; -- cgit From 73884a7082f466ce6686bb8dd7e6571dd42313b4 Mon Sep 17 00:00:00 2001 From: Subbaraya Sundeep Date: Mon, 4 Nov 2019 12:27:44 +0530 Subject: PCI: Do not use bus number zero from EA capability As per PCIe r5.0, sec 7.8.5.2, fixed bus numbers of a bridge must be zero when no function that uses EA is located behind it. Hence, if EA supplies bus numbers of zero, assign bus numbers normally. A secondary bus can never have a bus number of zero, so setting a bridge's Secondary Bus Number to zero makes downstream devices unreachable. [bhelgaas: retain bool return value so "zero is invalid" logic is local] Fixes: 2dbce5901179 ("PCI: Assign bus numbers present in EA capability for bridges") Link: https://lore.kernel.org/r/1572850664-9861-1-git-send-email-sundeep.lkml@gmail.com Signed-off-by: Subbaraya Sundeep Signed-off-by: Bjorn Helgaas Cc: stable@vger.kernel.org # v5.2+ --- drivers/pci/probe.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index bdbc8490f962..d3033873395d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1090,14 +1090,15 @@ static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus, * @sec: updated with secondary bus number from EA * @sub: updated with subordinate bus number from EA * - * If @dev is a bridge with EA capability, update @sec and @sub with - * fixed bus numbers from the capability and return true. Otherwise, - * return false. + * If @dev is a bridge with EA capability that specifies valid secondary + * and subordinate bus numbers, return true with the bus numbers in @sec + * and @sub. Otherwise return false. */ static bool pci_ea_fixed_busnrs(struct pci_dev *dev, u8 *sec, u8 *sub) { int ea, offset; u32 dw; + u8 ea_sec, ea_sub; if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) return false; @@ -1109,8 +1110,13 @@ static bool pci_ea_fixed_busnrs(struct pci_dev *dev, u8 *sec, u8 *sub) offset = ea + PCI_EA_FIRST_ENT; pci_read_config_dword(dev, offset, &dw); - *sec = dw & PCI_EA_SEC_BUS_MASK; - *sub = (dw & PCI_EA_SUB_BUS_MASK) >> PCI_EA_SUB_BUS_SHIFT; + ea_sec = dw & PCI_EA_SEC_BUS_MASK; + ea_sub = (dw & PCI_EA_SUB_BUS_MASK) >> PCI_EA_SUB_BUS_SHIFT; + if (ea_sec == 0 || ea_sub < ea_sec) + return false; + + *sec = ea_sec; + *sub = ea_sub; return true; } -- cgit