Add a new debug message for changing a BAR value of a device:
[ 1.851161] pci 0003:0a:00.1: BAR 0 updated: 0x60200c2000000 -> 0x6020142000000
Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@xxxxxxxxx>
---
drivers/pci/setup-res.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 83a491f6a2c2..5fed21aed9b8 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -27,7 +27,8 @@ static void pci_std_update_resource(struct pci_dev *dev, int resno)
struct pci_bus_region region;
bool disable;
u16 cmd;
- u32 new, check, mask;
+ u32 new, check, mask, old;
+ u64 old_start;
int reg;
struct resource *res = dev->resource + resno;
@@ -96,6 +97,9 @@ static void pci_std_update_resource(struct pci_dev *dev, int resno)
cmd & ~PCI_COMMAND_MEMORY);
}
+ pci_read_config_dword(dev, reg, &old);
+ old_start = old & mask;
+
pci_write_config_dword(dev, reg, new);
pci_read_config_dword(dev, reg, &check);
@@ -105,6 +109,9 @@ static void pci_std_update_resource(struct pci_dev *dev, int resno)
}
if (res->flags & IORESOURCE_MEM_64) {
+ pci_read_config_dword(dev, reg + 4, &old);
+ old_start |= (u64)old << 32;
+
new = region.start >> 16 >> 16;
pci_write_config_dword(dev, reg + 4, new);
pci_read_config_dword(dev, reg + 4, &check);
@@ -116,6 +123,11 @@ static void pci_std_update_resource(struct pci_dev *dev, int resno)
if (disable)
pci_write_config_word(dev, PCI_COMMAND, cmd);
+
+ if (old_start != region.start)
+ pci_info(dev, "BAR %d updated: %#llx -> %#llx\n", resno,
+ (unsigned long long)old_start,
+ (unsigned long long)region.start);
}
void pci_update_resource(struct pci_dev *dev, int resno)
--
2.24.1
