linux/drivers/pci/setup-res.c

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License cleanup: add SPDX GPL-2.0 license identifier to files with no license Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 14:07:57 +00:00
// SPDX-License-Identifier: GPL-2.0
/*
* drivers/pci/setup-res.c
*
* Extruded from code written by
* Dave Rusling (david.rusling@reo.mts.dec.com)
* David Mosberger (davidm@cs.arizona.edu)
* David Miller (davem@redhat.com)
*
* Support routines for initializing a PCI subsystem.
*/
/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
/*
* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
* Resource sorting
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/cache.h>
#include <linux/slab.h>
#include "pci.h"
static void pci_std_update_resource(struct pci_dev *dev, int resno)
{
struct pci_bus_region region;
bool disable;
u16 cmd;
u32 new, check, mask;
int reg;
struct resource *res = dev->resource + resno;
/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
if (dev->is_virtfn)
return;
/*
* Ignore resources for unimplemented BARs and unused resource slots
* for 64 bit BARs.
*/
if (!res->flags)
return;
if (res->flags & IORESOURCE_UNSET)
return;
/*
* Ignore non-moveable resources. This might be legacy resources for
* which no functional BAR register exists or another important
* system resource we shouldn't move around.
*/
if (res->flags & IORESOURCE_PCI_FIXED)
return;
pcibios_resource_to_bus(dev->bus, &region, res);
new = region.start;
if (res->flags & IORESOURCE_IO) {
mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
new |= res->flags & ~PCI_BASE_ADDRESS_IO_MASK;
} else if (resno == PCI_ROM_RESOURCE) {
mask = PCI_ROM_ADDRESS_MASK;
} else {
mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK;
}
if (resno < PCI_ROM_RESOURCE) {
reg = PCI_BASE_ADDRESS_0 + 4 * resno;
} else if (resno == PCI_ROM_RESOURCE) {
/*
* Apparently some Matrox devices have ROM BARs that read
* as zero when disabled, so don't update ROM BARs unless
* they're enabled. See https://lkml.org/lkml/2005/8/30/138.
*/
if (!(res->flags & IORESOURCE_ROM_ENABLE))
return;
reg = dev->rom_base_reg;
new |= PCI_ROM_ADDRESS_ENABLE;
} else
return;
/*
* We can't update a 64-bit BAR atomically, so when possible,
* disable decoding so that a half-updated BAR won't conflict
* with another device.
*/
disable = (res->flags & IORESOURCE_MEM_64) && !dev->mmio_always_on;
if (disable) {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
pci_write_config_word(dev, PCI_COMMAND,
cmd & ~PCI_COMMAND_MEMORY);
}
pci_write_config_dword(dev, reg, new);
pci_read_config_dword(dev, reg, &check);
if ((new ^ check) & mask) {
pci_err(dev, "BAR %d: error updating (%#08x != %#08x)\n",
resno, new, check);
}
if (res->flags & IORESOURCE_MEM_64) {
new = region.start >> 16 >> 16;
pci_write_config_dword(dev, reg + 4, new);
pci_read_config_dword(dev, reg + 4, &check);
if (check != new) {
pci_err(dev, "BAR %d: error updating (high %#08x != %#08x)\n",
resno, new, check);
}
}
if (disable)
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
void pci_update_resource(struct pci_dev *dev, int resno)
{
if (resno <= PCI_ROM_RESOURCE)
pci_std_update_resource(dev, resno);
#ifdef CONFIG_PCI_IOV
else if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
pci_iov_update_resource(dev, resno);
#endif
}
pci: do not mark exported functions as __devinit Functions marked __devinit will be removed after kernel init. But being exported they are potentially called by a module much later. So the safer choice seems to be to keep the function even in the non CONFIG_HOTPLUG case. This silence the follwoing section mismatch warnings: WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_add_device from __ksymtab_gpl between '__ksymtab_pci_bus_add_device' (at offset 0x20) and '__ksymtab_pci_walk_bus' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_create_bus from __ksymtab_gpl between '__ksymtab_pci_create_bus' (at offset 0x40) and '__ksymtab_pci_stop_bus_device' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_max_busnr from __ksymtab_gpl between '__ksymtab_pci_bus_max_busnr' (at offset 0xc0) and '__ksymtab_pci_assign_resource_fixed' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_claim_resource from __ksymtab_gpl between '__ksymtab_pci_claim_resource' (at offset 0xe0) and '__ksymtab_pcie_port_bus_type' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_add_devices from __ksymtab between '__ksymtab_pci_bus_add_devices' (at offset 0x70) and '__ksymtab_pci_bus_alloc_resource' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_scan_bus_parented from __ksymtab between '__ksymtab_pci_scan_bus_parented' (at offset 0x90) and '__ksymtab_pci_root_buses' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_assign_resources from __ksymtab between '__ksymtab_pci_bus_assign_resources' (at offset 0x4d0) and '__ksymtab_pci_bus_size_bridges' WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:pci_bus_size_bridges from __ksymtab between '__ksymtab_pci_bus_size_bridges' (at offset 0x4e0) and '__ksymtab_pci_setup_cardbus' Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-03-27 05:53:30 +00:00
int pci_claim_resource(struct pci_dev *dev, int resource)
{
struct resource *res = &dev->resource[resource];
struct resource *root, *conflict;
if (res->flags & IORESOURCE_UNSET) {
pci_info(dev, "can't claim BAR %d %pR: no address assigned\n",
resource, res);
return -EINVAL;
}
PCI: Don't attempt to claim shadow copies of ROM If we're using a shadow copy of a PCI device ROM, the shadow copy is in RAM and the device never sees accesses to it and doesn't respond to it. We don't have to route the shadow range to the PCI device, and the device doesn't have to claim the range. Previously we treated the shadow copy as though it were the ROM BAR, and we failed to claim it because the region wasn't routed to the device: pci 0000:01:00.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff] pci_bus 0000:01: Allocating resources pci 0000:01:00.0: can't claim BAR 6 [mem 0x000c0000-0x000dffff]: no compatible bridge window The failure path of pcibios_allocate_dev_rom_resource() cleared out the resource start address, which also caused the following ioremap() warning: WARNING: CPU: 0 PID: 116 at /build/linux-akdJXO/linux-4.8.0/arch/x86/mm/ioremap.c:121 __ioremap_caller+0x1ec/0x370 ioremap on RAM at 0x0000000000000000 - 0x000000000001ffff Handle an option ROM shadow copy as RAM, without trying to insert it into the iomem resource tree. This fixes a regression caused by 0c0e0736acad ("PCI: Set ROM shadow location in arch code, not in PCI core"), which appeared in v4.6. The regression causes video device initialization to fail. This was reported on AMD Turks, but it likely affects others as well. Fixes: 0c0e0736acad ("PCI: Set ROM shadow location in arch code, not in PCI core") Reported-and-tested-by: Vecu Bosseur <vecu.bosseur@gmail.com> Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627496 Link: https://bugzilla.kernel.org/show_bug.cgi?id=175391 Link: https://bugzilla.redhat.com/show_bug.cgi?id=1352272 Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.6+
2016-11-08 20:25:24 +00:00
/*
* If we have a shadow copy in RAM, the PCI device doesn't respond
* to the shadow range, so we don't need to claim it, and upstream
* bridges don't need to route the range to the device.
*/
if (res->flags & IORESOURCE_ROM_SHADOW)
return 0;
root = pci_find_parent_resource(dev, res);
if (!root) {
pci_info(dev, "can't claim BAR %d %pR: no compatible bridge window\n",
resource, res);
res->flags |= IORESOURCE_UNSET;
return -EINVAL;
}
conflict = request_resource_conflict(root, res);
if (conflict) {
pci_info(dev, "can't claim BAR %d %pR: address conflict with %s %pR\n",
resource, res, conflict->name, conflict);
res->flags |= IORESOURCE_UNSET;
return -EBUSY;
}
return 0;
}
EXPORT_SYMBOL(pci_claim_resource);
2009-03-16 08:13:39 +00:00
void pci_disable_bridge_window(struct pci_dev *dev)
{
pci_info(dev, "disabling bridge mem windows\n");
2009-03-16 08:13:39 +00:00
/* MMIO Base/Limit */
pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
/* Prefetchable MMIO Base/Limit */
pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
}
/*
* Generic function that returns a value indicating that the device's
* original BIOS BAR address was not saved and so is not available for
* reinstatement.
*
* Can be over-ridden by architecture specific code that implements
* reinstatement functionality rather than leaving it disabled when
* normal allocation attempts fail.
*/
resource_size_t __weak pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
{
return 0;
}
static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
int resno, resource_size_t size)
{
struct resource *root, *conflict;
resource_size_t fw_addr, start, end;
fw_addr = pcibios_retrieve_fw_addr(dev, resno);
if (!fw_addr)
return -ENOMEM;
start = res->start;
end = res->end;
res->start = fw_addr;
res->end = res->start + size - 1;
res->flags &= ~IORESOURCE_UNSET;
root = pci_find_parent_resource(dev, res);
if (!root) {
if (res->flags & IORESOURCE_IO)
root = &ioport_resource;
else
root = &iomem_resource;
}
pci_info(dev, "BAR %d: trying firmware assignment %pR\n",
resno, res);
conflict = request_resource_conflict(root, res);
if (conflict) {
pci_info(dev, "BAR %d: %pR conflicts with %s %pR\n",
resno, res, conflict->name, conflict);
res->start = start;
res->end = end;
res->flags |= IORESOURCE_UNSET;
return -EBUSY;
}
return 0;
}
/*
* We don't have to worry about legacy ISA devices, so nothing to do here.
* This is marked as __weak because multiple architectures define it; it should
* eventually go away.
*/
resource_size_t __weak pcibios_align_resource(void *data,
const struct resource *res,
resource_size_t size,
resource_size_t align)
{
return res->start;
}
static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
int resno, resource_size_t size, resource_size_t align)
{
struct resource *res = dev->resource + resno;
resource_size_t min;
int ret;
min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
/*
* First, try exact prefetching match. Even if a 64-bit
* prefetchable bridge window is below 4GB, we can't put a 32-bit
* prefetchable resource in it because pbus_size_mem() assumes a
* 64-bit window will contain no 32-bit resources. If we assign
* things differently than they were sized, not everything will fit.
*/
ret = pci_bus_alloc_resource(bus, res, size, align, min,
PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources This patch changes the way we handle 64-bit prefetchable bridge windows to make it more likely that we can assign space to all devices. Previously we put all prefetchable resources in the prefetchable bridge window. If any of those resources was 32-bit only, we restricted the window to be below 4GB. After this patch, we only put 64-bit prefetchable resources in a 64-bit prefetchable window. We put all 32-bit prefetchable resources in the non-prefetchable window, even if there are no 64-bit prefetchable resources. With the previous approach, if there was a 32-bit prefetchable resource behind a bridge, we forced the bridge's prefetchable window below 4GB, which meant that even if there was plenty of space above 4GB available, we couldn't use it, and assignment of large 64-bit resources could fail, as in the bugzilla below. The new strategy is: 1) If the prefetchable window is 64 bits wide, we put only 64-bit prefetchable resources in it. Any 32-bit prefetchable resources go in the non-prefetchable window. 2) If the prefetchable window is 32 bits wide, we put both 32- and 64-bit prefetchable resources in it. 3) If there is no prefetchable window, all MMIO resources go in the non-prefetchable window. This reduces performance for 32-bit prefetchable resources below a bridge with a 64-bit prefetchable window. We previously assigned prefetchable space, but now we'll assign non-prefetchable space. This is the case even if there are no 64-bit prefetchable resources, or if they would all fit below 4GB. In those cases, the old strategy would work and would have better performance. [bhelgaas: write changelog, add bugzilla link, fold in mem64_mask removal] Link: https://bugzilla.kernel.org/show_bug.cgi?id=74151 Tested-by: Guo Chao <yan@linux.vnet.ibm.com> Tested-by: Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2014-05-19 23:01:55 +00:00
IORESOURCE_PREFETCH | IORESOURCE_MEM_64,
pcibios_align_resource, dev);
if (ret == 0)
return 0;
/*
* If the prefetchable window is only 32 bits wide, we can put
* 64-bit prefetchable resources in it.
*/
if ((res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) ==
PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources This patch changes the way we handle 64-bit prefetchable bridge windows to make it more likely that we can assign space to all devices. Previously we put all prefetchable resources in the prefetchable bridge window. If any of those resources was 32-bit only, we restricted the window to be below 4GB. After this patch, we only put 64-bit prefetchable resources in a 64-bit prefetchable window. We put all 32-bit prefetchable resources in the non-prefetchable window, even if there are no 64-bit prefetchable resources. With the previous approach, if there was a 32-bit prefetchable resource behind a bridge, we forced the bridge's prefetchable window below 4GB, which meant that even if there was plenty of space above 4GB available, we couldn't use it, and assignment of large 64-bit resources could fail, as in the bugzilla below. The new strategy is: 1) If the prefetchable window is 64 bits wide, we put only 64-bit prefetchable resources in it. Any 32-bit prefetchable resources go in the non-prefetchable window. 2) If the prefetchable window is 32 bits wide, we put both 32- and 64-bit prefetchable resources in it. 3) If there is no prefetchable window, all MMIO resources go in the non-prefetchable window. This reduces performance for 32-bit prefetchable resources below a bridge with a 64-bit prefetchable window. We previously assigned prefetchable space, but now we'll assign non-prefetchable space. This is the case even if there are no 64-bit prefetchable resources, or if they would all fit below 4GB. In those cases, the old strategy would work and would have better performance. [bhelgaas: write changelog, add bugzilla link, fold in mem64_mask removal] Link: https://bugzilla.kernel.org/show_bug.cgi?id=74151 Tested-by: Guo Chao <yan@linux.vnet.ibm.com> Tested-by: Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2014-05-19 23:01:55 +00:00
(IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) {
ret = pci_bus_alloc_resource(bus, res, size, align, min,
IORESOURCE_PREFETCH,
pcibios_align_resource, dev);
if (ret == 0)
return 0;
}
PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources This patch changes the way we handle 64-bit prefetchable bridge windows to make it more likely that we can assign space to all devices. Previously we put all prefetchable resources in the prefetchable bridge window. If any of those resources was 32-bit only, we restricted the window to be below 4GB. After this patch, we only put 64-bit prefetchable resources in a 64-bit prefetchable window. We put all 32-bit prefetchable resources in the non-prefetchable window, even if there are no 64-bit prefetchable resources. With the previous approach, if there was a 32-bit prefetchable resource behind a bridge, we forced the bridge's prefetchable window below 4GB, which meant that even if there was plenty of space above 4GB available, we couldn't use it, and assignment of large 64-bit resources could fail, as in the bugzilla below. The new strategy is: 1) If the prefetchable window is 64 bits wide, we put only 64-bit prefetchable resources in it. Any 32-bit prefetchable resources go in the non-prefetchable window. 2) If the prefetchable window is 32 bits wide, we put both 32- and 64-bit prefetchable resources in it. 3) If there is no prefetchable window, all MMIO resources go in the non-prefetchable window. This reduces performance for 32-bit prefetchable resources below a bridge with a 64-bit prefetchable window. We previously assigned prefetchable space, but now we'll assign non-prefetchable space. This is the case even if there are no 64-bit prefetchable resources, or if they would all fit below 4GB. In those cases, the old strategy would work and would have better performance. [bhelgaas: write changelog, add bugzilla link, fold in mem64_mask removal] Link: https://bugzilla.kernel.org/show_bug.cgi?id=74151 Tested-by: Guo Chao <yan@linux.vnet.ibm.com> Tested-by: Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2014-05-19 23:01:55 +00:00
/*
* If we didn't find a better match, we can put any memory resource
* in a non-prefetchable window. If this resource is 32 bits and
* non-prefetchable, the first call already tried the only possibility
* so we don't need to try again.
*/
if (res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64))
ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
pcibios_align_resource, dev);
return ret;
}
static int _pci_assign_resource(struct pci_dev *dev, int resno,
resource_size_t size, resource_size_t min_align)
{
struct pci_bus *bus;
int ret;
bus = dev->bus;
while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
if (!bus->parent || !bus->self->transparent)
break;
bus = bus->parent;
}
return ret;
}
int pci_assign_resource(struct pci_dev *dev, int resno)
{
struct resource *res = dev->resource + resno;
resource_size_t align, size;
int ret;
if (res->flags & IORESOURCE_PCI_FIXED)
return 0;
res->flags |= IORESOURCE_UNSET;
PCI SR-IOV: correct broken resource alignment calculations An SR-IOV capable device includes an SR-IOV PCIe capability which describes the Virtual Function (VF) BAR requirements. A typical SR-IOV device can support multiple VFs whose BARs must be in a contiguous region, effectively an array of VF BARs. The BAR reports the size requirement for a single VF. We calculate the full range needed by simply multiplying the VF BAR size with the number of possible VFs and create a resource spanning the full range. This all seems sane enough except it artificially inflates the alignment requirement for the VF BAR. The VF BAR need only be aligned to the size of a single BAR not the contiguous range of VF BARs. This can cause us to fail to allocate resources for the BAR despite the fact that we actually have enough space. This patch adds a thin PCI specific layer over the generic resource_alignment() function which is aware of the special nature of VF BARs and does sorting and allocation based on the smaller alignment requirement. I recognize that while resource_alignment is generic, it's basically a PCI helper. An alternative to this patch is to add PCI VF BAR specific information to struct resource. I opted for the extra layer rather than adding such PCI specific information to struct resource. This does have the slight downside that we don't cache the BAR size and re-read for each alignment query (happens a small handful of times during boot for each VF BAR). Signed-off-by: Chris Wright <chrisw@sous-sol.org> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Yu Zhao <yu.zhao@intel.com> Cc: stable@kernel.org Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-08-28 20:00:06 +00:00
align = pci_resource_alignment(dev, res);
if (!align) {
pci_info(dev, "BAR %d: can't assign %pR (bogus alignment)\n",
resno, res);
return -EINVAL;
}
size = resource_size(res);
ret = _pci_assign_resource(dev, resno, size, align);
/*
* If we failed to assign anything, let's try the address
* where firmware left it. That at least has a chance of
* working, which is better than just leaving it disabled.
*/
if (ret < 0) {
pci_info(dev, "BAR %d: no space for %pR\n", resno, res);
ret = pci_revert_fw_address(res, dev, resno, size);
}
if (ret < 0) {
pci_info(dev, "BAR %d: failed to assign %pR\n", resno, res);
return ret;
}
res->flags &= ~IORESOURCE_UNSET;
res->flags &= ~IORESOURCE_STARTALIGN;
pci_info(dev, "BAR %d: assigned %pR\n", resno, res);
if (resno < PCI_BRIDGE_RESOURCES)
pci_update_resource(dev, resno);
return 0;
}
EXPORT_SYMBOL(pci_assign_resource);
int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsize,
resource_size_t min_align)
{
struct resource *res = dev->resource + resno;
unsigned long flags;
resource_size_t new_size;
int ret;
if (res->flags & IORESOURCE_PCI_FIXED)
return 0;
flags = res->flags;
res->flags |= IORESOURCE_UNSET;
if (!res->parent) {
pci_info(dev, "BAR %d: can't reassign an unassigned resource %pR\n",
resno, res);
return -EINVAL;
}
/* already aligned with min_align */
new_size = resource_size(res) + addsize;
ret = _pci_assign_resource(dev, resno, new_size, min_align);
if (ret) {
res->flags = flags;
pci_info(dev, "BAR %d: %pR (failed to expand by %#llx)\n",
resno, res, (unsigned long long) addsize);
return ret;
}
res->flags &= ~IORESOURCE_UNSET;
res->flags &= ~IORESOURCE_STARTALIGN;
pci_info(dev, "BAR %d: reassigned %pR (expanded by %#llx)\n",
resno, res, (unsigned long long) addsize);
if (resno < PCI_BRIDGE_RESOURCES)
pci_update_resource(dev, resno);
return 0;
}
void pci_release_resource(struct pci_dev *dev, int resno)
{
struct resource *res = dev->resource + resno;
pci_info(dev, "BAR %d: releasing %pR\n", resno, res);
release_resource(res);
res->end = resource_size(res) - 1;
res->start = 0;
res->flags |= IORESOURCE_UNSET;
}
EXPORT_SYMBOL(pci_release_resource);
int pci_resize_resource(struct pci_dev *dev, int resno, int size)
{
struct resource *res = dev->resource + resno;
int old, ret;
u32 sizes;
u16 cmd;
/* Make sure the resource isn't assigned before resizing it. */
if (!(res->flags & IORESOURCE_UNSET))
return -EBUSY;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (cmd & PCI_COMMAND_MEMORY)
return -EBUSY;
sizes = pci_rebar_get_possible_sizes(dev, resno);
if (!sizes)
return -ENOTSUPP;
if (!(sizes & BIT(size)))
return -EINVAL;
old = pci_rebar_get_current_size(dev, resno);
if (old < 0)
return old;
ret = pci_rebar_set_size(dev, resno, size);
if (ret)
return ret;
res->end = res->start + pci_rebar_size_to_bytes(size) - 1;
/* Check if the new config works by trying to assign everything. */
ret = pci_reassign_bridge_resources(dev->bus->self, res->flags);
if (ret)
goto error_resize;
return 0;
error_resize:
pci_rebar_set_size(dev, resno, old);
res->end = res->start + pci_rebar_size_to_bytes(old) - 1;
return ret;
}
EXPORT_SYMBOL(pci_resize_resource);
int pci_enable_resources(struct pci_dev *dev, int mask)
{
u16 cmd, old_cmd;
int i;
struct resource *r;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
if (!(mask & (1 << i)))
continue;
r = &dev->resource[i];
if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
continue;
if ((i == PCI_ROM_RESOURCE) &&
(!(r->flags & IORESOURCE_ROM_ENABLE)))
continue;
if (r->flags & IORESOURCE_UNSET) {
pci_err(dev, "can't enable device: BAR %d %pR not assigned\n",
i, r);
return -EINVAL;
}
if (!r->parent) {
pci_err(dev, "can't enable device: BAR %d %pR not claimed\n",
i, r);
return -EINVAL;
}
if (r->flags & IORESOURCE_IO)
cmd |= PCI_COMMAND_IO;
if (r->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
if (cmd != old_cmd) {
pci_info(dev, "enabling device (%04x -> %04x)\n", old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}