There are two ways we can get ECAM (aka MCFG) regions using ACPI,
from MCFG static table and from _CBA method. We cannot remove static
regions, however regions coming from _CBA should be removed while removing
bridge device.
In the light of above we need flag to mark hot added ECAM entries
so that user should use pci_mmconfig_inject while adding regions from
_CBA method.
Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Tested-by: Jeremy Linton <jeremy.linton@xxxxxxx>
Tested-by: Duc Dang <dhdang@xxxxxxx>
Tested-by: Dongdong Liu <liudongdong3@xxxxxxxxxx>
Tested-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Tested-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
Tested-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
---
drivers/pci/ecam.c | 2 ++
include/linux/ecam.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
index 7bc75af..fea5700 100644
--- a/drivers/pci/ecam.c
+++ b/drivers/pci/ecam.c
@@ -131,6 +131,7 @@ struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
new->segment = segment;
new->start_bus = start;
new->end_bus = end;
+ new->hot_added = false;
res = &new->res;
res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
@@ -221,6 +222,7 @@ int pci_mmconfig_inject(struct pci_mmcfg_region *cfg)
err = -ENOMEM;
goto out;
} else {
+ cfg->hot_added = true;
list_add_sorted(cfg);
pr_info("MMCONFIG at %pR (base %#lx)\n",
&cfg->res, (unsigned long)cfg->address);
diff --git a/include/linux/ecam.h b/include/linux/ecam.h
index 813acd1..e0f322e 100644
--- a/include/linux/ecam.h
+++ b/include/linux/ecam.h
@@ -17,6 +17,7 @@ struct pci_mmcfg_region {
u8 start_bus;
u8 end_bus;
char name[PCI_MMCFG_RESOURCE_NAME_LEN];
+ bool hot_added;
};
struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
--
1.9.1
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