Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965185Ab2EWGfG (ORCPT ); Wed, 23 May 2012 02:35:06 -0400 Received: from acsinet15.oracle.com ([141.146.126.227]:34498 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965170Ab2EWGe6 (ORCPT ); Wed, 23 May 2012 02:34:58 -0400 From: Yinghai Lu To: Bjorn Helgaas Cc: Andrew Morton , Linus Torvalds , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH 07/11] PCI: Don't allocate small resource in big empty space. Date: Tue, 22 May 2012 23:34:33 -0700 Message-Id: <1337754877-19759-8-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1337754877-19759-1-git-send-email-yinghai@kernel.org> References: <1337754877-19759-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11977 Lines: 327 Use updated find_resource to return matched resource instead using head of bigger range. Signed-off-by: Yinghai Lu --- drivers/pci/bus.c | 22 ++++++++++++++++++---- drivers/pci/setup-bus.c | 12 ++++++++---- drivers/pci/setup-res.c | 28 ++++++++++++++++++---------- include/linux/ioport.h | 8 ++++++++ include/linux/pci.h | 10 ++++++++++ kernel/resource.c | 22 +++++++++++++++++++--- 6 files changed, 81 insertions(+), 21 deletions(-) diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 2429f1f..a7ba102 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -110,14 +110,14 @@ void pci_bus_remove_resources(struct pci_bus *bus) * for a specific device resource. */ int -pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, +pci_bus_alloc_resource_fit(struct pci_bus *bus, struct resource *res, resource_size_t size, resource_size_t align, resource_size_t min, unsigned int type_mask, resource_size_t (*alignf)(void *, const struct resource *, resource_size_t, resource_size_t), - void *alignf_data) + void *alignf_data, bool fit) { int i, ret = -ENOMEM; struct resource *r; @@ -148,10 +148,10 @@ again: continue; /* Ok, try it out.. */ - ret = allocate_resource(r, res, size, + ret = allocate_resource_fit(r, res, size, max(bottom, r->start ? : min), max, align, - alignf, alignf_data); + alignf, alignf_data, fit); if (ret == 0) return 0; } @@ -164,6 +164,20 @@ again: return ret; } +int +pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, + resource_size_t size, resource_size_t align, + resource_size_t min, unsigned int type_mask, + resource_size_t (*alignf)(void *, + const struct resource *, + resource_size_t, + resource_size_t), + void *alignf_data) +{ + return pci_bus_alloc_resource_fit(bus, res, size, align, min, type_mask, + alignf, alignf_data, false); +} + /** * pci_bus_add_device - add a single device * @dev: device to add diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 0568f29..4d6823f 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -275,7 +275,7 @@ out: * requests that could not satisfied to the failed_list. */ static void assign_requested_resources_sorted(struct list_head *head, - struct list_head *fail_head) + struct list_head *fail_head, bool fit) { struct resource *res; struct pci_dev_resource *dev_res; @@ -285,7 +285,7 @@ static void assign_requested_resources_sorted(struct list_head *head, res = dev_res->res; idx = res - &dev_res->dev->resource[0]; if (resource_size(res) && - pci_assign_resource(dev_res->dev, idx)) { + pci_assign_resource_fit(dev_res->dev, idx, fit)) { if (fail_head) { /* * if the failed res is for ROM BAR, and it will @@ -320,6 +320,7 @@ static void __assign_resources_sorted(struct list_head *head, LIST_HEAD(local_fail_head); struct pci_dev_resource *save_res; struct pci_dev_resource *dev_res; + bool fit = true; /* Check if optional add_size is there */ if (!realloc_head || list_empty(realloc_head)) @@ -339,7 +340,7 @@ static void __assign_resources_sorted(struct list_head *head, dev_res->res); /* Try updated head list with add_size added */ - assign_requested_resources_sorted(head, &local_fail_head); + assign_requested_resources_sorted(head, &local_fail_head, fit); /* all assigned with add_size ? */ if (list_empty(&local_fail_head)) { @@ -366,9 +367,12 @@ static void __assign_resources_sorted(struct list_head *head, } free_list(&save_head); + /* will need to expand later, so not use fit */ + fit = false; + requested_and_reassign: /* Satisfy the must-have resource requests */ - assign_requested_resources_sorted(head, fail_head); + assign_requested_resources_sorted(head, fail_head, fit); /* Try to satisfy any additional optional resource requests */ diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index eea85da..7010ad9 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -128,7 +128,8 @@ void pci_disable_bridge_window(struct pci_dev *dev) } static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, - int resno, resource_size_t size, resource_size_t align) + int resno, resource_size_t size, resource_size_t align, + bool fit) { struct resource *res = dev->resource + resno; resource_size_t min; @@ -137,9 +138,9 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; /* First, try exact prefetching match.. */ - ret = pci_bus_alloc_resource(bus, res, size, align, min, + ret = pci_bus_alloc_resource_fit(bus, res, size, align, min, IORESOURCE_PREFETCH, - pcibios_align_resource, dev); + pcibios_align_resource, dev, fit); if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { /* @@ -148,8 +149,8 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, * But a prefetching area can handle a non-prefetching * window (it will just not perform as well). */ - ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, - pcibios_align_resource, dev); + ret = pci_bus_alloc_resource_fit(bus, res, size, align, min, 0, + pcibios_align_resource, dev, fit); } return ret; } @@ -206,7 +207,8 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev, return ret; } -static int _pci_assign_resource(struct pci_dev *dev, int resno, int size, resource_size_t min_align) +static int _pci_assign_resource(struct pci_dev *dev, int resno, int size, + resource_size_t min_align, bool fit) { struct resource *res = dev->resource + resno; struct pci_bus *bus; @@ -214,7 +216,8 @@ static int _pci_assign_resource(struct pci_dev *dev, int resno, int size, resour char *type; bus = dev->bus; - while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) { + while ((ret = __pci_assign_resource(bus, dev, resno, size, + min_align, fit))) { if (!bus->parent || !bus->self->transparent) break; bus = bus->parent; @@ -253,7 +256,7 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsiz /* already aligned with min_align */ new_size = resource_size(res) + addsize; - ret = _pci_assign_resource(dev, resno, new_size, min_align); + ret = _pci_assign_resource(dev, resno, new_size, min_align, false); if (!ret) { res->flags &= ~IORESOURCE_STARTALIGN; dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res); @@ -263,7 +266,7 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsiz return ret; } -int pci_assign_resource(struct pci_dev *dev, int resno) +int pci_assign_resource_fit(struct pci_dev *dev, int resno, bool fit) { struct resource *res = dev->resource + resno; resource_size_t align, size; @@ -279,7 +282,7 @@ int pci_assign_resource(struct pci_dev *dev, int resno) bus = dev->bus; size = resource_size(res); - ret = _pci_assign_resource(dev, resno, size, align); + ret = _pci_assign_resource(dev, resno, size, align, fit); /* * If we failed to assign anything, let's try the address @@ -298,6 +301,11 @@ int pci_assign_resource(struct pci_dev *dev, int resno) return ret; } +int pci_assign_resource(struct pci_dev *dev, int resno) +{ + return pci_assign_resource_fit(dev, resno, false); +} + int pci_enable_resources(struct pci_dev *dev, int mask) { u16 cmd, old_cmd; diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 589e0e7..255852e 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -148,6 +148,14 @@ extern struct resource *insert_resource_conflict(struct resource *parent, struct extern int insert_resource(struct resource *parent, struct resource *new); extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new); extern void arch_remove_reservations(struct resource *avail); +int allocate_resource_fit(struct resource *root, struct resource *new, + resource_size_t size, resource_size_t min, + resource_size_t max, resource_size_t align, + resource_size_t (*alignf)(void *, + const struct resource *, + resource_size_t, + resource_size_t), + void *alignf_data, bool fit); extern int allocate_resource(struct resource *root, struct resource *new, resource_size_t size, resource_size_t min, resource_size_t max, resource_size_t align, diff --git a/include/linux/pci.h b/include/linux/pci.h index a0e2d7f..c0704a0 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -827,6 +827,7 @@ int __pci_reset_function_locked(struct pci_dev *dev); int pci_reset_function(struct pci_dev *dev); void pci_update_resource(struct pci_dev *dev, int resno); int __must_check pci_assign_resource(struct pci_dev *dev, int i); +int __must_check pci_assign_resource_fit(struct pci_dev *dev, int i, bool fit); int __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align); int pci_select_bars(struct pci_dev *dev, unsigned long flags); @@ -943,6 +944,15 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus, resource_size_t, resource_size_t), void *alignf_data); +int __must_check pci_bus_alloc_resource_fit(struct pci_bus *bus, + struct resource *res, resource_size_t size, + resource_size_t align, resource_size_t min, + unsigned int type_mask, + resource_size_t (*alignf)(void *, + const struct resource *, + resource_size_t, + resource_size_t), + void *alignf_data, bool fit); void pci_enable_bridges(struct pci_bus *bus); /* Proper probing supporting hot-pluggable devices */ diff --git a/kernel/resource.c b/kernel/resource.c index 45ab24d..b4dae55 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -580,7 +580,7 @@ static int __allocate_resource(struct resource *root, struct resource *new, const struct resource *, resource_size_t, resource_size_t), - void *alignf_data, bool lock) + void *alignf_data, bool lock, bool fit) { int err; struct resource_constraint constraint; @@ -602,13 +602,28 @@ static int __allocate_resource(struct resource *root, struct resource *new, if (lock) write_lock(&resource_lock); - err = find_resource(root, new, size, &constraint, false); + err = find_resource(root, new, size, &constraint, fit); if (err >= 0 && __request_resource(root, new)) err = -EBUSY; if (lock) write_unlock(&resource_lock); return err; } +int allocate_resource_fit(struct resource *root, struct resource *new, + resource_size_t size, resource_size_t min, + resource_size_t max, resource_size_t align, + resource_size_t (*alignf)(void *, + const struct resource *, + resource_size_t, + resource_size_t), + void *alignf_data, bool fit) +{ + bool lock = true; + + return __allocate_resource(root, new, size, min, max, align, + alignf, alignf_data, lock, fit); +} + int allocate_resource(struct resource *root, struct resource *new, resource_size_t size, resource_size_t min, resource_size_t max, resource_size_t align, @@ -619,9 +634,10 @@ int allocate_resource(struct resource *root, struct resource *new, void *alignf_data) { bool lock = true; + bool fit = false; return __allocate_resource(root, new, size, min, max, align, - alignf, alignf_data, lock); + alignf, alignf_data, lock, fit); } EXPORT_SYMBOL(allocate_resource); -- 1.7.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/