From mboxrd@z Thu Jan 1 00:00:00 1970 From: tn@semihalf.com (Tomasz Nowicki) Date: Tue, 16 Feb 2016 14:53:34 +0100 Subject: [PATCH V5 04/15] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not. In-Reply-To: <1455630825-27253-1-git-send-email-tn@semihalf.com> References: <1455630825-27253-1-git-send-email-tn@semihalf.com> Message-ID: <1455630825-27253-5-git-send-email-tn@semihalf.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Tested-by: Suravee Suthikulpanit Tested-by: Jeremy Linton Tested-by: Duc Dang Tested-by: Dongdong Liu Tested-by: Hanjun Guo Tested-by: Graeme Gregory Tested-by: Sinan Kaya --- 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