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Subject[PATCH V4 10/23] x86, pci: Cleanup platform specific MCFG data by using ECAM hot_added flag.
Date
Because of two facts:
1. MCFG region has hot_added flag
2. struct acpi_pci_root has topology info (domain, bus number)
we can get rid of arch specific mcfg data from x86 struct pci_root_info.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
arch/x86/pci/acpi.c | 36 ++++++++++++++----------------------
1 file changed, 14 insertions(+), 22 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index a997d7c..8e89921 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -12,11 +12,6 @@
struct pci_root_info {
struct acpi_pci_root_info common;
struct pci_sysdata sd;
-#ifdef CONFIG_PCI_MMCONFIG
- bool mcfg_added;
- u8 start_bus;
- u8 end_bus;
-#endif
};

static bool pci_use_crs = true;
@@ -180,16 +175,13 @@ static int check_segment(u16 seg, struct device *dev, char *estr)

static int setup_mcfg_map(struct acpi_pci_root_info *ci)
{
- int result, seg;
- struct pci_root_info *info;
+ int result, seg, start, end;
struct acpi_pci_root *root = ci->root;
struct device *dev = &ci->bridge->dev;

- info = container_of(ci, struct pci_root_info, common);
- info->start_bus = (u8)root->secondary.start;
- info->end_bus = (u8)root->secondary.end;
- info->mcfg_added = false;
- seg = info->sd.domain;
+ seg = root->segment;
+ start = root->secondary.start;
+ end = root->secondary.end;

/* return success if MMCFG is not in use */
if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
@@ -198,13 +190,11 @@ static int setup_mcfg_map(struct acpi_pci_root_info *ci)
if (!(pci_probe & PCI_PROBE_MMCONF))
return check_segment(seg, dev, "MMCONFIG is disabled,");

- result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
- root->mcfg_addr);
+ result = pci_mmconfig_insert(dev, seg, start, end, root->mcfg_addr);
if (result == 0) {
/* enable MMCFG if it hasn't been enabled yet */
if (raw_pci_ext_ops == NULL)
raw_pci_ext_ops = &pci_mmcfg;
- info->mcfg_added = true;
} else if (result != -EEXIST)
return check_segment(seg, dev,
"fail to add MMCONFIG information,");
@@ -214,14 +204,16 @@ static int setup_mcfg_map(struct acpi_pci_root_info *ci)

static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
{
- struct pci_root_info *info;
+ struct acpi_pci_root *root = ci->root;
+ struct pci_mmcfg_region *cfg;

- info = container_of(ci, struct pci_root_info, common);
- if (info->mcfg_added) {
- pci_mmconfig_delete(info->sd.domain,
- info->start_bus, info->end_bus);
- info->mcfg_added = false;
- }
+ cfg = pci_mmconfig_lookup(root->segment, root->secondary.start);
+ if (!cfg)
+ return;
+
+ if (cfg->hot_added)
+ pci_mmconfig_delete(root->segment, root->secondary.start,
+ root->secondary.end);
}
#else
static int setup_mcfg_map(struct acpi_pci_root_info *ci)
--
1.9.1
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