[PATCH 1/4] PCI: export pci_read_base and add pci_update_base
Export pci_read_base; add pci_update_base to for PCI BAR update.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
Signed-off-by: Eddie Dong <eddie.dong@xxxxxxxxx>
---
drivers/pci/probe.c | 25 ++++++++--------
drivers/pci/setup-res.c | 74 +++++++++++++++++++++++++++--------------------
include/linux/pci.h | 12 ++++++++
3 files changed, 67 insertions(+), 44 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 7098dfb..d030996 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -181,13 +181,6 @@ static u64 pci_size(u64 base, u64 maxbas
return size;
}
-enum pci_bar_type {
- pci_bar_unknown, /* Standard PCI BAR probe */
- pci_bar_io, /* An io port BAR */
- pci_bar_mem32, /* A 32-bit memory BAR */
- pci_bar_mem64, /* A 64-bit memory BAR */
-};
-
static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
{
if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
@@ -202,11 +195,18 @@ static inline enum pci_bar_type decode_b
return pci_bar_mem32;
}
-/*
- * If the type is not unknown, we assume that the lowest bit is 'enable'.
+/**
+ * pci_read_base - read a PCI BAR
+ * @dev: PCI device
+ * @type: type of BAR
+ * @res: resource buffer to be filled in
+ * @pos: BAR position in config space
+ *
* Returns 1 if the BAR was 64-bit and 0 if it was 32-bit.
+ *
+ * If the type is not unknown, we assume that the lowest bit is 'enable'.
*/
-static int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
+int pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
struct resource *res, unsigned int pos)
{
u32 l, sz, mask;
@@ -299,6 +299,7 @@ static int __pci_read_base(struct pci_de
res->flags = 0;
goto out;
}
+EXPORT_SYMBOL_GPL(pci_read_base);
static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
{
@@ -307,7 +308,7 @@ static void pci_read_bases(struct pci_de
for (pos = 0; pos < howmany; pos++) {
struct resource *res = &dev->resource[pos];
reg = PCI_BASE_ADDRESS_0 + (pos << 2);
- pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
+ pos += pci_read_base(dev, pci_bar_unknown, res, reg);
}
if (rom) {
@@ -316,7 +317,7 @@ static void pci_read_bases(struct pci_de
res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
IORESOURCE_SIZEALIGN;
- __pci_read_base(dev, pci_bar_mem32, res, rom);
+ pci_read_base(dev, pci_bar_mem32, res, rom);
}
}
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 1a5fc83..059de16 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -26,11 +26,20 @@ #include <linux/slab.h>
#include "pci.h"
-void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
+/**
+ * pci_update_base - update a PCI BAR
+ * @dev: PCI device
+ * @type: type of BAR
+ * @res: resource info used to update BAR
+ * @pos: BAR position in config space
+ *
+ * If the type is not unknown, we assume that the lowest bit is 'enable'.
+ */
+void pci_update_base(struct pci_dev *dev, enum pci_bar_type type,
+ struct resource *res, unsigned int pos)
{
struct pci_bus_region region;
u32 new, check, mask;
- int reg;
/*
* Ignore resources for unimplemented BARs and unused resource slots
@@ -49,56 +58,57 @@ void pci_update_resource(struct pci_dev
pcibios_resource_to_bus(dev, ®ion, res);
- dev_dbg(&dev->dev, "BAR %d: got res [%#llx-%#llx] bus [%#llx-%#llx] "
- "flags %#lx\n", resno,
- (unsigned long long)res->start,
- (unsigned long long)res->end,
- (unsigned long long)region.start,
- (unsigned long long)region.end,
- (unsigned long)res->flags);
+ dev_dbg(&dev->dev, "BAR at %d: got res [%#llx-%#llx] bus [%#llx-%#llx] "
+ "flags %#lx\n", pos, (unsigned long long)res->start,
+ (unsigned long long)res->end, (unsigned long long)region.start,
+ (unsigned long long)region.end, (unsigned long)res->flags);
new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
+ if (type != pci_bar_unknown)
+ new |= PCI_ROM_ADDRESS_ENABLE;
+
if (res->flags & IORESOURCE_IO)
mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
else
mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
- if (resno < 6) {
- reg = PCI_BASE_ADDRESS_0 + 4 * resno;
- } else if (resno == PCI_ROM_RESOURCE) {
- if (!(res->flags & IORESOURCE_ROM_ENABLE))
- return;
- new |= PCI_ROM_ADDRESS_ENABLE;
- reg = dev->rom_base_reg;
- } else {
- /* Hmm, non-standard resource. */
-
- return; /* kill uninitialised var warning */
- }
-
- pci_write_config_dword(dev, reg, new);
- pci_read_config_dword(dev, reg, &check);
+ pci_write_config_dword(dev, pos, new);
+ pci_read_config_dword(dev, pos, &check);
if ((new ^ check) & mask) {
- dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
- resno, new, check);
+ dev_err(&dev->dev, "BAR at %d: error updating "
+ "(%#08x != %#08x)\n", pos, new, check);
}
if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
(PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
new = region.start >> 16 >> 16;
- pci_write_config_dword(dev, reg + 4, new);
- pci_read_config_dword(dev, reg + 4, &check);
+ pci_write_config_dword(dev, pos + 4, new);
+ pci_read_config_dword(dev, pos + 4, &check);
if (check != new) {
- dev_err(&dev->dev, "BAR %d: error updating "
- "(high %#08x != %#08x)\n", resno, new, check);
+ dev_err(&dev->dev, "BAR at %d: error updating "
+ "(high %#08x != %#08x)\n", pos, new, check);
}
}
res->flags &= ~IORESOURCE_UNSET;
- dev_dbg(&dev->dev, "BAR %d: moved to bus [%#llx-%#llx] flags %#lx\n",
- resno, (unsigned long long)region.start,
+ dev_dbg(&dev->dev, "BAR at %d: moved to bus [%#llx-%#llx] flags %#lx\n",
+ pos, (unsigned long long)region.start,
(unsigned long long)region.end, res->flags);
}
+EXPORT_SYMBOL_GPL(pci_update_base);
+
+void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
+{
+ if (resno < 6) {
+ pci_update_base(dev, pci_bar_unknown, res,
+ PCI_BASE_ADDRESS_0 + 4 * resno);
+ } else if (resno == PCI_ROM_RESOURCE) {
+ if (!(res->flags & IORESOURCE_ROM_ENABLE))
+ return;
+ pci_update_base(dev, pci_bar_mem32, res, dev->rom_base_reg);
+ } else
+ dev_err(&dev->dev, "Invalid BAR resource #%d\n", resno);
+}
int pci_claim_resource(struct pci_dev *dev, int resource)
{
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 825be38..9ea3a1d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -312,6 +312,18 @@ struct pci_bus {
#define pci_bus_b(n) list_entry(n, struct pci_bus, node)
#define to_pci_bus(n) container_of(n, struct pci_bus, dev)
+enum pci_bar_type {
+ pci_bar_unknown, /* Standard PCI BAR probe */
+ pci_bar_io, /* An io port BAR */
+ pci_bar_mem32, /* A 32-bit memory BAR */
+ pci_bar_mem64, /* A 64-bit memory BAR */
+};
+
+int pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
+ struct resource *res, unsigned int reg);
+void pci_update_base(struct pci_dev *dev, enum pci_bar_type type,
+ struct resource *res, unsigned int reg);
+
/*
* Error values that may be returned by PCI functions.
*/
--
1.4.2.1
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