3rd-party/linux-kernel-module-cheat
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Code Issues Releases Wiki Activity

More random pci tweaking attempts

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This commit is contained in:
Ciro Santilli
2017-06-16 16:43:59 +01:00
parent 50f58c0dda
commit f662a9105f
2 changed files with 17 additions and 14 deletions
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30
kernel_module/pci.c
View File

@@ -13,7 +13,7 @@ http://nairobi-embedded.org/linux_pci_device_driver.html
#define MAX_DEVICE 1 #define MAX_DEVICE 1
#define DEVICE_NAME "virtual_pci" #define DEVICE_NAME "virtual_pci"
#define BAR_IO 2 #define BAR_IO 0
#define BAR_MEM 3 #define BAR_MEM 3
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
@@ -52,12 +52,13 @@ static struct pci_dev *pci_cdev_search_pci_dev(struct pci_cdev pci_cdev[], int s
int i; int i;
struct pci_dev *pdev = NULL; struct pci_dev *pdev = NULL;
for (i=0; i<size; i++) { for(i=0; i<size; i++) {
if (pci_cdev[i].minor == minor) { if (pci_cdev[i].minor == minor) {
pdev = pci_cdev[i].pci_dev; pdev = pci_cdev[i].pci_dev;
break; break;
} }
} }
return pdev; return pdev;
} }
@@ -152,7 +153,7 @@ static int pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
pr_info("pci_probe\n"); pr_info("pci_probe\n");
ret = -1; minor = -1;
for (i=0; i<MAX_DEVICE; i++) { for (i=0; i<MAX_DEVICE; i++) {
if (pci_cdev[i].pci_dev == NULL) { if (pci_cdev[i].pci_dev == NULL) {
pci_cdev[i].pci_dev = dev; pci_cdev[i].pci_dev = dev;
@@ -160,7 +161,7 @@ static int pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
break; break;
} }
} }
if (ret < 0) { if (minor < 0) {
dev_info(&(dev->dev), "error pci_cdev_add"); dev_info(&(dev->dev), "error pci_cdev_add");
goto error; goto error;
} }
@@ -192,23 +193,24 @@ static int pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
pci_enable_device(dev); pci_enable_device(dev);
/* 'alloc' IO to talk with the card */ /* 'alloc' IO to talk with the card */
if (pci_request_region(dev, BAR_IO, "IO-pci") == 0) { if (pci_request_region(dev, BAR_IO, "IO-pci")) {
dev_err(&(dev->dev), "Can't request BAR2\n"); dev_err(&(dev->dev), "Can't request BAR0\n");
cdev_del(cdev); cdev_del(cdev);
goto error; goto error;
} }
/* TODO */
/* check that BAR_IO is *really* IO region */ /* check that BAR_IO is *really* IO region */
if ((pci_resource_flags(dev, BAR_IO) & IORESOURCE_IO) != IORESOURCE_IO) { /*if ((pci_resource_flags(dev, BAR_IO) & IORESOURCE_IO) != IORESOURCE_IO) {*/
dev_err(&(dev->dev), "BAR2 isn't an IO region\n"); /*dev_err(&(dev->dev), "BAR2 isn't an IO region\n");*/
cdev_del(cdev); /*cdev_del(cdev);*/
goto error; /*goto error;*/
} /*}*/
return 1; return 0;
error: error:
return 0; return 1;
} }
static void pci_remove(struct pci_dev *dev) static void pci_remove(struct pci_dev *dev)
@@ -235,7 +237,7 @@ static int __init pci_init_module(void)
{ {
int i, first_minor, ret; int i, first_minor, ret;
ret = alloc_chrdev_region(&devno, 0, MAX_DEVICE, "buffer"); ret = alloc_chrdev_region(&devno, 0, MAX_DEVICE, "lkmc_pci");
major = MAJOR(devno); major = MAJOR(devno);
first_minor = MINOR(devno); first_minor = MINOR(devno);
for (i=0; i < MAX_DEVICE; i++) { for (i=0; i < MAX_DEVICE; i++) {

1
runqemu
View File

@@ -49,6 +49,7 @@ case "$arch" in
cmd="$debug_qemu ./buildroot/output/host/usr/bin/qemu-system-x86_64 \ cmd="$debug_qemu ./buildroot/output/host/usr/bin/qemu-system-x86_64 \
-M pc \ -M pc \
-append 'root=/dev/vda $extra_append' \ -append 'root=/dev/vda $extra_append' \
-device edu \
-drive file=${images_dir}/rootfs.ext2,if=virtio,format=raw \ -drive file=${images_dir}/rootfs.ext2,if=virtio,format=raw \
-kernel ${images_dir}/bzImage \ -kernel ${images_dir}/bzImage \
-m 128M \ -m 128M \