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pci.sh /proc/interrupts and lspci -k, pci.c dev_info

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This commit is contained in:
Ciro Santilli
2017-06-24 10:24:36 +01:00
parent a8e11e6de9
commit b1b2817a68
2 changed files with 23 additions and 2 deletions
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9
kernel_module/pci.c
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@@ -1,4 +1,8 @@
/* /*
Usage:
/pci.sh
Like every other hardware, we could interact with PCI on x86 Like every other hardware, we could interact with PCI on x86
using only IO instructions and memory operations. using only IO instructions and memory operations.
@@ -140,7 +144,7 @@ static irqreturn_t irq_handler(int irq, void *dev)
devi = *(int *)dev; devi = *(int *)dev;
if (devi == major) { if (devi == major) {
irq_status = ioread32(mmio + IO_IRQ_STATUS); irq_status = ioread32(mmio + IO_IRQ_STATUS);
pr_info("interrupt irq = %d dev = %d irq_status = %llx\n", pr_info("irq_handler irq = %d dev = %d irq_status = %llx\n",
irq, devi, (unsigned long long)irq_status); irq, devi, (unsigned long long)irq_status);
/* Must do this ACK, or else the interrupts just keeps firing. */ /* Must do this ACK, or else the interrupts just keeps firing. */
iowrite32(irq_status, mmio + IO_IRQ_ACK); iowrite32(irq_status, mmio + IO_IRQ_ACK);
@@ -162,7 +166,8 @@ static int pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{ {
u8 val; u8 val;
pr_info("pci_probe\n"); /* https://stackoverflow.com/questions/31382803/how-does-dev-family-functions-are-useful-while-debugging-kernel/44734857#44734857 */
dev_info(&(dev->dev), "pci_probe\n");
major = register_chrdev(0, CDEV_NAME, &fops); major = register_chrdev(0, CDEV_NAME, &fops);
pdev = dev; pdev = dev;
if (pci_enable_device(dev) < 0) { if (pci_enable_device(dev) < 0) {

16
rootfs_overlay/pci.sh
View File

@@ -2,10 +2,21 @@
set -ex set -ex
# Our modules does not the PCI device yet.
lspci -k
# => 00:04.0 Class 00ff: 1234:11e8 lkmc_pci
# Interrupt counts before we generate our interrupts.
cat /proc/interrupts
# Setup. # Setup.
insmod /pci.ko insmod /pci.ko
/mknoddev.sh pci /mknoddev.sh pci
# Shows that this module owns the PCI device.
lspci -k
# => 00:04.0 Class 00ff: 1234:11e8 lkmc_pci
# Identifiction: just returns some fixed magic bytes. # Identifiction: just returns some fixed magic bytes.
dd bs=4 status=none if=/dev/lkmc_pci count=1 skip=0 | od -An -t x1 dd bs=4 status=none if=/dev/lkmc_pci count=1 skip=0 | od -An -t x1
# => 010000ed # => 010000ed
@@ -39,3 +50,8 @@ sleep 1
# Teardown. # Teardown.
rm /dev/lkmc_pci rm /dev/lkmc_pci
rmmod pci rmmod pci
# Interrupt counts after we generate our interrupts.
# Compare with before.
cat /proc/interrupts