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author | 2017-04-28 10:32:50 -0500 | |
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committer | 2017-04-28 10:32:50 -0500 | |
commit | 4940421013672aafdc8c372c17b5ddf63423c805 (patch) | |
tree | 6f1e6e59332a349cd45f7dc6c7aadfb11818f0bc /drivers/pci | |
parent | Merge branch 'pci/host-faraday' into next (diff) | |
parent | PCI: hv: Convert hv_pci_dev.refs from atomic_t to refcount_t (diff) | |
download | linux-4940421013672aafdc8c372c17b5ddf63423c805.tar.gz linux-4940421013672aafdc8c372c17b5ddf63423c805.tar.bz2 linux-4940421013672aafdc8c372c17b5ddf63423c805.zip |
Merge branch 'pci/host-hv' into next
* pci/host-hv:
PCI: hv: Convert hv_pci_dev.refs from atomic_t to refcount_t
PCI: hv: Allocate interrupt descriptors with GFP_ATOMIC
PCI: hv: Specify CPU_AFFINITY_ALL for MSI affinity when >= 32 CPUs
PCI: hv: Lock PCI bus on device eject
PCI: hv: Properly handle PCI bus remove
Diffstat (limited to 'drivers/pci')
-rw-r--r-- | drivers/pci/host/pci-hyperv.c | 46 |
1 files changed, 35 insertions, 11 deletions
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index ada98569b78e..84936383e269 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -56,6 +56,7 @@ #include <asm/apic.h> #include <linux/msi.h> #include <linux/hyperv.h> +#include <linux/refcount.h> #include <asm/mshyperv.h> /* @@ -72,6 +73,7 @@ enum { PCI_PROTOCOL_VERSION_CURRENT = PCI_PROTOCOL_VERSION_1_1 }; +#define CPU_AFFINITY_ALL -1ULL #define PCI_CONFIG_MMIO_LENGTH 0x2000 #define CFG_PAGE_OFFSET 0x1000 #define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET) @@ -350,6 +352,7 @@ enum hv_pcibus_state { hv_pcibus_init = 0, hv_pcibus_probed, hv_pcibus_installed, + hv_pcibus_removed, hv_pcibus_maximum }; @@ -421,7 +424,7 @@ enum hv_pcidev_ref_reason { struct hv_pci_dev { /* List protected by pci_rescan_remove_lock */ struct list_head list_entry; - atomic_t refs; + refcount_t refs; enum hv_pcichild_state state; struct pci_function_description desc; bool reported_missing; @@ -876,7 +879,7 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) hv_int_desc_free(hpdev, int_desc); } - int_desc = kzalloc(sizeof(*int_desc), GFP_KERNEL); + int_desc = kzalloc(sizeof(*int_desc), GFP_ATOMIC); if (!int_desc) goto drop_reference; @@ -897,9 +900,13 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) * processors because Hyper-V only supports 64 in a guest. */ affinity = irq_data_get_affinity_mask(data); - for_each_cpu_and(cpu, affinity, cpu_online_mask) { - int_pkt->int_desc.cpu_mask |= - (1ULL << vmbus_cpu_number_to_vp_number(cpu)); + if (cpumask_weight(affinity) >= 32) { + int_pkt->int_desc.cpu_mask = CPU_AFFINITY_ALL; + } else { + for_each_cpu_and(cpu, affinity, cpu_online_mask) { + int_pkt->int_desc.cpu_mask |= + (1ULL << vmbus_cpu_number_to_vp_number(cpu)); + } } ret = vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt, @@ -1208,9 +1215,11 @@ static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus) hbus->pci_bus->msi = &hbus->msi_chip; hbus->pci_bus->msi->dev = &hbus->hdev->device; + pci_lock_rescan_remove(); pci_scan_child_bus(hbus->pci_bus); pci_bus_assign_resources(hbus->pci_bus); pci_bus_add_devices(hbus->pci_bus); + pci_unlock_rescan_remove(); hbus->state = hv_pcibus_installed; return 0; } @@ -1254,13 +1263,13 @@ static void q_resource_requirements(void *context, struct pci_response *resp, static void get_pcichild(struct hv_pci_dev *hpdev, enum hv_pcidev_ref_reason reason) { - atomic_inc(&hpdev->refs); + refcount_inc(&hpdev->refs); } static void put_pcichild(struct hv_pci_dev *hpdev, enum hv_pcidev_ref_reason reason) { - if (atomic_dec_and_test(&hpdev->refs)) + if (refcount_dec_and_test(&hpdev->refs)) kfree(hpdev); } @@ -1314,7 +1323,7 @@ static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus, wait_for_completion(&comp_pkt.host_event); hpdev->desc = *desc; - get_pcichild(hpdev, hv_pcidev_ref_initial); + refcount_set(&hpdev->refs, 1); get_pcichild(hpdev, hv_pcidev_ref_childlist); spin_lock_irqsave(&hbus->device_list_lock, flags); @@ -1504,13 +1513,24 @@ static void pci_devices_present_work(struct work_struct *work) put_pcichild(hpdev, hv_pcidev_ref_initial); } - /* Tell the core to rescan bus because there may have been changes. */ - if (hbus->state == hv_pcibus_installed) { + switch(hbus->state) { + case hv_pcibus_installed: + /* + * Tell the core to rescan bus + * because there may have been changes. + */ pci_lock_rescan_remove(); pci_scan_child_bus(hbus->pci_bus); pci_unlock_rescan_remove(); - } else { + break; + + case hv_pcibus_init: + case hv_pcibus_probed: survey_child_resources(hbus); + break; + + default: + break; } up(&hbus->enum_sem); @@ -1600,8 +1620,10 @@ static void hv_eject_device_work(struct work_struct *work) pdev = pci_get_domain_bus_and_slot(hpdev->hbus->sysdata.domain, 0, wslot); if (pdev) { + pci_lock_rescan_remove(); pci_stop_and_remove_bus_device(pdev); pci_dev_put(pdev); + pci_unlock_rescan_remove(); } spin_lock_irqsave(&hpdev->hbus->device_list_lock, flags); @@ -2185,6 +2207,7 @@ static int hv_pci_probe(struct hv_device *hdev, hbus = kzalloc(sizeof(*hbus), GFP_KERNEL); if (!hbus) return -ENOMEM; + hbus->state = hv_pcibus_init; /* * The PCI bus "domain" is what is called "segment" in ACPI and @@ -2348,6 +2371,7 @@ static int hv_pci_remove(struct hv_device *hdev) pci_stop_root_bus(hbus->pci_bus); pci_remove_root_bus(hbus->pci_bus); pci_unlock_rescan_remove(); + hbus->state = hv_pcibus_removed; } hv_pci_bus_exit(hdev); |