linux-kernel - [PATCH V4 09/23] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not.

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Message-Id: <1454606941-9523-10-git-send-email-tn@semihalf.com>
Date:	Thu,  4 Feb 2016 18:28:47 +0100
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	bhelgaas@...gle.com, arnd@...db.de, will.deacon@....com,
	catalin.marinas@....com, rjw@...ysocki.net, hanjun.guo@...aro.org,
	Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
	jiang.liu@...ux.intel.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,
	jchandra@...adcom.com, jcm@...hat.com,
	Tomasz Nowicki <tn@...ihalf.com>
Subject: [PATCH V4 09/23] 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,
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@...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/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