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Subject[PATCH -v2 20/26] PCI: Add addon_resource support for pci_dev
Date
Will add addon_resources list in pci_dev, it will be used for resources
other than standard, rom, sriov, bridges.
Some could be same as std reg, but using different register.
Some could have own way to read/write to them.

Kernel using different way to hack those resources like abusing
pci bridge resource spot on non bridge pci device.

With this patch, will treat addon-resource like standard resource with
special ops.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/probe.c | 18 ++++++++++++++++++
include/linux/pci.h | 16 ++++++++++++++++
2 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index dfa56fb..6dbad5b 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -82,6 +82,12 @@ struct resource *pci_dev_resource_n(struct pci_dev *dev, int n)
if (n < PCI_NUM_RESOURCES)
return &dev->resource[n];

+ n -= PCI_NUM_RESOURCES;
+ list_for_each_entry(addon_res, &dev->addon_resources, list) {
+ if (n-- == 0)
+ return &addon_res->res;
+ }
+
return NULL;
}

@@ -97,6 +103,16 @@ int pci_dev_resource_idx(struct pci_dev *dev, struct resource *res)
return -1;
}

+static void pci_release_dev_addon_res(struct pci_dev *dev)
+{
+ struct pci_dev_addon_resource *addon_res, *tmp;
+
+ list_for_each_entry_safe(addon_res, tmp, &dev->addon_resources, list) {
+ list_del(&addon_res->list);
+ kfree(addon_res);
+ }
+}
+
static u64 pci_size(u64 base, u64 maxbase, u64 mask)
{
u64 size = mask & maxbase; /* Find the significant bits */
@@ -1288,6 +1304,7 @@ static void pci_release_dev(struct device *dev)
pci_dev = to_pci_dev(dev);
pci_release_capabilities(pci_dev);
pci_release_of_node(pci_dev);
+ pci_release_dev_addon_res(pci_dev);
kfree(pci_dev);
}

@@ -1367,6 +1384,7 @@ struct pci_dev *alloc_pci_dev(void)
return NULL;

INIT_LIST_HEAD(&dev->bus_list);
+ INIT_LIST_HEAD(&dev->addon_resources);

return dev;
}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c7a2806..2c8b1a4 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -299,6 +299,7 @@ struct pci_dev {
*/
unsigned int irq;
struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
+ struct list_head addon_resources; /* addon I/O and memory resource */

/* These fields are used by common fixups */
unsigned int transparent:1; /* Transparent PCI bridge */
@@ -347,6 +348,21 @@ struct pci_dev {
#endif
};

+struct resource_ops {
+ int (*read)(struct pci_dev *dev, struct resource *res, int addr);
+ int (*write)(struct pci_dev *dev, struct resource *res, int addr);
+};
+
+struct pci_dev_addon_resource {
+ struct list_head list;
+ int reg_addr;
+ int size;
+ struct resource res;
+ struct resource_ops *ops;
+};
+#define to_pci_dev_addon_resource(n) \
+ container_of(n, struct pci_dev_addon_resource, res)
+
struct resource *pci_dev_resource_n(struct pci_dev *dev, int n);
int pci_dev_resource_idx(struct pci_dev *dev, struct resource *res);

--
1.7.7


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