linux-kernel - [PATCH V5 04/15] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not.

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Date:	Tue, 16 Feb 2016 14:53:34 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	helgaas@...nel.org, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rafael@...nel.org, hanjun.guo@...aro.org,
	Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
	jiang.liu@...ux.intel.com, jchandra@...adcom.com,
	Stefano.Stabellini@...citrix.com
Cc:	robert.richter@...iumnetworks.com, mw@...ihalf.com,
	Liviu.Dudau@....com, ddaney@...iumnetworks.com,
	wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
	msalter@...hat.com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	jcm@...hat.com, Tomasz Nowicki <tn@...ihalf.com>
Subject: [PATCH V5 04/15] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not.

There are two ways we can get ECAM (aka MCFG) regions using ACPI,
first from MCFG static table and second 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
and user to call pci_mmconfig_insert while adding regions from _CBA method.
Similarly pci_mmconfig_delete while removing hot added regions.

Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Tested-by: Jeremy Linton <jeremy.linton@....com>
Tested-by: Duc Dang <dhdang@....com>
Tested-by: Dongdong Liu <liudongdong3@...wei.com>
Tested-by: Hanjun Guo <hanjun.guo@...aro.org>
Tested-by: Graeme Gregory <graeme.gregory@...aro.org>
Tested-by: Sinan Kaya <okaya@...eaurora.org>
---
 drivers/acpi/pci_mcfg.c  | 4 +++-
 include/linux/pci-acpi.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index 0467b00..3282f2a 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -74,6 +74,7 @@ static 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);
@@ -205,6 +206,7 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
 	}
 	rc = pci_mmconfig_map_resource(dev, cfg);
 	if (!rc) {
+		cfg->hot_added = true;
 		list_add_sorted(cfg);
 		dev_info(dev, "MMCONFIG at %pR (base %#lx)\n",
 				 &cfg->res, (unsigned long)addr);
@@ -228,7 +230,7 @@ int pci_mmconfig_delete(u16 seg, u8 start, u8 end)
 	mutex_lock(&pci_mmcfg_lock);
 	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
 		if (cfg->segment == seg && cfg->start_bus == start &&
-		    cfg->end_bus == end) {
+		    cfg->end_bus == end && cfg->hot_added) {
 			list_del_rcu(&cfg->list);
 			synchronize_rcu();
 			pci_mmconfig_unmap_resource(cfg);
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index e9450ef..94d8f38 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -119,6 +119,7 @@ struct pci_mmcfg_region {
 	u8 start_bus;
 	u8 end_bus;
 	char name[PCI_MMCFG_RESOURCE_NAME_LEN];
+	bool hot_added;
 };
 
 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
-- 
1.9.1