[PATCH v4] PCI: vmd: Assign a number to each VMD controller

From: brookxu
Date: Fri Sep 17 2021 - 09:13:31 EST


From: Chunguang Xu <brookxu@xxxxxxxxxxx>

If the system has multiple VMD controllers, the driver does not assign
a number to each controller, so when analyzing the interrupt through
/proc/interrupts, the names of all controllers are the same, which is
not very convenient for problem analysis. Here, try to assign a number
to each VMD controller.

Signed-off-by: Chunguang Xu <brookxu@xxxxxxxxxxx>
Reviewed-by: Jon Derrick <jonathan.derrick@xxxxxxxxx>
---
v4: remove out label.
v3: update subject line.
v2: update commit message.

drivers/pci/controller/vmd.c | 41 +++++++++++++++++++++++++++++++++--------
1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index e3fcdfe..feaab36 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -69,6 +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.
*/
@@ -119,6 +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)
@@ -599,7 +603,7 @@ 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;
}
@@ -779,18 +783,32 @@ 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;
@@ -799,11 +817,16 @@ 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)
@@ -824,6 +847,8 @@ 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
@@ -848,7 +873,7 @@ 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;
}
--
1.8.3.1