Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932647AbcDHAWV (ORCPT ); Thu, 7 Apr 2016 20:22:21 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:36595 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932588AbcDHAWQ (ORCPT ); Thu, 7 Apr 2016 20:22:16 -0400 From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Linus Torvalds Cc: Wei Yang , TJ , Yijing Wang , Khalid Aziz , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v11 29/60] PCI: Don't add too much optional size for hotplug bridge MMIO Date: Thu, 7 Apr 2016 17:15:42 -0700 Message-Id: <1460074573-7481-30-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1460074573-7481-1-git-send-email-yinghai@kernel.org> References: <1460074573-7481-1-git-send-email-yinghai@kernel.org> X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4655 Lines: 132 Current code will always add 2M for hotplug bridge MMIO even there is child device under it already. For example: 40:03.0 --- 43:00.0 --- 44:02.0 -+- 45:00.0 \- 45:00.1 44:02.0 will need 1M as must for 45:00.0 and 45:00.1 When we calculate add_size for 44:02.0, we pass 2M as additional size for hotplug bridge, total will be 3M. That is different from code before changes for optional support, or even current code that treat optional as required directly by not passing realloc list. We only need 2M as total. The optional size should be 1M, and total size should be 2M. This patch change to comparing required+optional with min_sum_size to get smaller optional size. Signed-off-by: Yinghai Lu --- drivers/pci/setup-bus.c | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 12fd6d9..f6b7b8f 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1198,7 +1198,6 @@ out: * @type2: second match type * @type3: third match type * @min_size : the minimum memory window that must to be allocated - * @add_size : additional optional memory window * @realloc_head : track the additional memory window on this list * * Calculate the size of the bus and minimal alignment which @@ -1211,10 +1210,11 @@ out: static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long type, unsigned long type2, unsigned long type3, - resource_size_t min_size, resource_size_t add_size, + resource_size_t min_size, struct list_head *realloc_head) { struct pci_dev *dev; + resource_size_t min_sum_size = 0; resource_size_t min_align = 0, min_add_align = 0; resource_size_t max_align = 0, max_add_align = 0; resource_size_t size = 0, size0 = 0, size1 = 0, sum_add_size = 0; @@ -1226,6 +1226,11 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, if (!b_res) return -ENOSPC; + if (realloc_head) { + min_sum_size = min_size; + min_size = 0; + } + list_for_each_entry(dev, &bus->devices, bus_list) { int i; @@ -1298,8 +1303,8 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, } free_align_test_list(&align_test_list); - if ((sum_add_size - size) < add_size) - sum_add_size = size + add_size; + if (sum_add_size < min_sum_size) + sum_add_size = min_sum_size; if (sum_add_size > size && realloc_head) { min_add_align = calculate_mem_align(&align_test_add_list, max_add_align, sum_add_size, @@ -1436,7 +1441,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) { struct pci_dev *dev; unsigned long mask, prefmask, type2 = 0, type3 = 0; - resource_size_t additional_mem_size = 0, additional_io_size = 0; + resource_size_t min_mem_size = 0, additional_io_size = 0; struct resource *b_res; int ret; @@ -1473,7 +1478,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) case PCI_CLASS_BRIDGE_PCI: if (bus->self->is_hotplug_bridge) { additional_io_size = pci_hotplug_io_size; - additional_mem_size = pci_hotplug_mem_size; + min_mem_size = pci_hotplug_mem_size; } /* Fall through */ default: @@ -1493,8 +1498,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) prefmask |= IORESOURCE_MEM_64; ret = pbus_size_mem(bus, prefmask, prefmask, prefmask, prefmask, - realloc_head ? 0 : additional_mem_size, - additional_mem_size, realloc_head); + min_mem_size, realloc_head); /* * If successful, all non-prefetchable resources @@ -1517,8 +1521,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) prefmask &= ~IORESOURCE_MEM_64; ret = pbus_size_mem(bus, prefmask, prefmask, prefmask, prefmask, - realloc_head ? 0 : additional_mem_size, - additional_mem_size, realloc_head); + min_mem_size, realloc_head); /* * If successful, only non-prefetchable resources @@ -1527,7 +1530,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) if (ret == 0) mask = prefmask; else - additional_mem_size += additional_mem_size; + min_mem_size += min_mem_size; type2 = type3 = IORESOURCE_MEM; } @@ -1548,8 +1551,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) * window. */ pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3, - realloc_head ? 0 : additional_mem_size, - additional_mem_size, realloc_head); + min_mem_size, realloc_head); break; } } -- 1.8.4.5