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authorBjorn Helgaas <bhelgaas@google.com>2021-11-05 19:28:53 +0300
committerBjorn Helgaas <bhelgaas@google.com>2021-11-05 19:28:53 +0300
commit7b4bc1011182bacd5bec8bf6c2c5096ecbb80061 (patch)
tree5a27abbe0cefb4e5b076e19dee7a9480727e5f28 /drivers/pci/controller/vmd.c
parent607f7f0b4cb22059a4ed4c2bb69987da9894f8a4 (diff)
parent42cf2a633d5dc2b5abc440d61b6c1c5fb7dddbbb (diff)
downloadlinux-7b4bc1011182bacd5bec8bf6c2c5096ecbb80061.tar.xz
Merge branch 'remotes/lorenzo/pci/vmd'
- Assign a number to each VMD controller to distinguish them in /proc/interrupts (Chunguang Xu) - Don't disable VMD MSI-X remapping if IOMMU remapping is enabled (Adrian Huang) - Add Kconfig dependency on !UML for allyesconfig build issue (Johannes Berg) * remotes/lorenzo/pci/vmd: PCI: vmd: depend on !UML PCI: vmd: Do not disable MSI-X remapping if interrupt remapping is enabled by IOMMU PCI: vmd: Assign a number to each VMD controller
Diffstat (limited to 'drivers/pci/controller/vmd.c')
-rw-r--r--drivers/pci/controller/vmd.c45
1 files changed, 36 insertions, 9 deletions
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 1ed2667069ab..a45e8e59d3d4 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -6,6 +6,7 @@
#include <linux/device.h>
#include <linux/interrupt.h>
+#include <linux/iommu.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -68,6 +69,8 @@ enum vmd_features {
VMD_FEAT_CAN_BYPASS_MSI_REMAP = (1 << 4),
};
+static DEFINE_IDA(vmd_instance_ida);
+
/*
* Lock for manipulating VMD IRQ lists.
*/
@@ -118,6 +121,8 @@ struct vmd_dev {
struct pci_bus *bus;
u8 busn_start;
u8 first_vec;
+ char *name;
+ int instance;
};
static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
@@ -648,7 +653,7 @@ static int vmd_alloc_irqs(struct vmd_dev *vmd)
INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
vmd_irq, IRQF_NO_THREAD,
- "vmd", &vmd->irqs[i]);
+ vmd->name, &vmd->irqs[i]);
if (err)
return err;
}
@@ -759,7 +764,8 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
* acceptable because the guest is usually CPU-limited and MSI
* remapping doesn't become a performance bottleneck.
*/
- if (!(features & VMD_FEAT_CAN_BYPASS_MSI_REMAP) ||
+ if (iommu_capable(vmd->dev->dev.bus, IOMMU_CAP_INTR_REMAP) ||
+ !(features & VMD_FEAT_CAN_BYPASS_MSI_REMAP) ||
offset[0] || offset[1]) {
ret = vmd_alloc_irqs(vmd);
if (ret)
@@ -832,18 +838,32 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
return -ENOMEM;
vmd->dev = dev;
+ vmd->instance = ida_simple_get(&vmd_instance_ida, 0, 0, GFP_KERNEL);
+ if (vmd->instance < 0)
+ return vmd->instance;
+
+ vmd->name = kasprintf(GFP_KERNEL, "vmd%d", vmd->instance);
+ if (!vmd->name) {
+ err = -ENOMEM;
+ goto out_release_instance;
+ }
+
err = pcim_enable_device(dev);
if (err < 0)
- return err;
+ goto out_release_instance;
vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
- if (!vmd->cfgbar)
- return -ENOMEM;
+ if (!vmd->cfgbar) {
+ err = -ENOMEM;
+ goto out_release_instance;
+ }
pci_set_master(dev);
if (dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64)) &&
- dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)))
- return -ENODEV;
+ dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32))) {
+ err = -ENODEV;
+ goto out_release_instance;
+ }
if (features & VMD_FEAT_OFFSET_FIRST_VECTOR)
vmd->first_vec = 1;
@@ -852,11 +872,16 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
pci_set_drvdata(dev, vmd);
err = vmd_enable_domain(vmd, features);
if (err)
- return err;
+ goto out_release_instance;
dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
vmd->sysdata.domain);
return 0;
+
+ out_release_instance:
+ ida_simple_remove(&vmd_instance_ida, vmd->instance);
+ kfree(vmd->name);
+ return err;
}
static void vmd_cleanup_srcu(struct vmd_dev *vmd)
@@ -877,6 +902,8 @@ static void vmd_remove(struct pci_dev *dev)
vmd_cleanup_srcu(vmd);
vmd_detach_resources(vmd);
vmd_remove_irq_domain(vmd);
+ ida_simple_remove(&vmd_instance_ida, vmd->instance);
+ kfree(vmd->name);
}
#ifdef CONFIG_PM_SLEEP
@@ -901,7 +928,7 @@ static int vmd_resume(struct device *dev)
for (i = 0; i < vmd->msix_count; i++) {
err = devm_request_irq(dev, pci_irq_vector(pdev, i),
vmd_irq, IRQF_NO_THREAD,
- "vmd", &vmd->irqs[i]);
+ vmd->name, &vmd->irqs[i]);
if (err)
return err;
}