| Message ID | 20240312105152.3457899-6-cassel@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: endpoint: set prefetchable bit for 64-bit BARs | expand |
Hi Niklas,
kernel test robot noticed the following build warnings:
[auto build test WARNING on pci/next]
[also build test WARNING on next-20240312]
[cannot apply to pci/for-linus mani-mhi/mhi-next linus/master v6.8]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Niklas-Cassel/PCI-endpoint-pci-epf-test-Fix-incorrect-loop-increment/20240312-185512
base: https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link: https://lore.kernel.org/r/20240312105152.3457899-6-cassel%40kernel.org
patch subject: [PATCH v2 5/9] PCI: endpoint: pci-epf-test: Simplify pci_epf_test_set_bar() loop
config: arc-randconfig-001-20240313 (https://download.01.org/0day-ci/archive/20240313/202403131004.Z9epuI06-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240313/202403131004.Z9epuI06-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403131004.Z9epuI06-lkp@intel.com/
All warnings (new ones prefixed by >>):
drivers/pci/endpoint/functions/pci-epf-test.c: In function 'pci_epf_test_set_bar':
>> drivers/pci/endpoint/functions/pci-epf-test.c:717:40: warning: variable 'epc_features' set but not used [-Wunused-but-set-variable]
717 | const struct pci_epc_features *epc_features;
| ^~~~~~~~~~~~
vim +/epc_features +717 drivers/pci/endpoint/functions/pci-epf-test.c
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 709
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 710 static int pci_epf_test_set_bar(struct pci_epf *epf)
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 711 {
2287a91bfd63cb Niklas Cassel 2024-03-12 712 int bar, ret;
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 713 struct pci_epc *epc = epf->epc;
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 714 struct device *dev = &epf->dev;
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 715 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
3235b994950d84 Kishon Vijay Abraham I 2017-08-18 716 enum pci_barno test_reg_bar = epf_test->test_reg_bar;
2c04c5b8eef797 Kishon Vijay Abraham I 2019-01-14 @717 const struct pci_epc_features *epc_features;
2c04c5b8eef797 Kishon Vijay Abraham I 2019-01-14 718
2c04c5b8eef797 Kishon Vijay Abraham I 2019-01-14 719 epc_features = epf_test->epc_features;
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 720
2287a91bfd63cb Niklas Cassel 2024-03-12 721 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
2287a91bfd63cb Niklas Cassel 2024-03-12 722 if (!epf_test->reg[bar])
2c04c5b8eef797 Kishon Vijay Abraham I 2019-01-14 723 continue;
2c04c5b8eef797 Kishon Vijay Abraham I 2019-01-14 724
53fd3cbe5e9d79 Kishon Vijay Abraham I 2021-08-19 725 ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no,
2287a91bfd63cb Niklas Cassel 2024-03-12 726 &epf->bar[bar]);
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 727 if (ret) {
63840ff5322373 Kishon Vijay Abraham I 2021-02-02 728 pci_epf_free_space(epf, epf_test->reg[bar], bar,
63840ff5322373 Kishon Vijay Abraham I 2021-02-02 729 PRIMARY_INTERFACE);
798c0441bec8c4 Gustavo Pimentel 2018-05-14 730 dev_err(dev, "Failed to set BAR%d\n", bar);
3235b994950d84 Kishon Vijay Abraham I 2017-08-18 731 if (bar == test_reg_bar)
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 732 return ret;
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 733 }
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 734 }
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 735
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 736 return 0;
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 737 }
349e7a85b25fa6 Kishon Vijay Abraham I 2017-03-27 738
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 20c79610712d..05b9bc1e89cd 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -709,9 +709,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf) static int pci_epf_test_set_bar(struct pci_epf *epf) { - int bar, add; - int ret; - struct pci_epf_bar *epf_bar; + int bar, ret; struct pci_epc *epc = epf->epc; struct device *dev = &epf->dev; struct pci_epf_test *epf_test = epf_get_drvdata(epf); @@ -720,20 +718,12 @@ static int pci_epf_test_set_bar(struct pci_epf *epf) epc_features = epf_test->epc_features; - for (bar = 0; bar < PCI_STD_NUM_BARS; bar += add) { - epf_bar = &epf->bar[bar]; - /* - * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64 - * if the specific implementation required a 64-bit BAR, - * even if we only requested a 32-bit BAR. - */ - add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1; - - if (epc_features->bar[bar].type == BAR_RESERVED) + for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) { + if (!epf_test->reg[bar]) continue; ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, - epf_bar); + &epf->bar[bar]); if (ret) { pci_epf_free_space(epf, epf_test->reg[bar], bar, PRIMARY_INTERFACE);
Simplify the loop in pci_epf_test_set_bar(). If we allocated memory for the BAR, we need to call set_bar() for that BAR, if we did not allocated memory for that BAR, we need to skip. It is as simple as that. This also matches the logic in pci_epf_test_unbind(). A 64-bit BAR will still only be one allocation, with the BAR succeeding the 64-bit BAR being null. While at it, remove the misleading comment. A EPC .set_bar() callback should never change the epf_bar->flags. (E.g. to set a 64-bit BAR if we requested a 32-bit BAR.) A .set_bar() callback should do what we request it to do. If it can't satisfy the request, it should return an error. If platform has a specific requirement, e.g. that a certain BAR has to be a 64-bit BAR, then it should specify that by setting the .only_64bit flag for that specific BAR in epc_features->bar[], such that pci_epf_alloc_space() will return a epf_bar with the 64-bit flag set. (Such that .set_bar() will receive a request to set a 64-bit BAR.) Signed-off-by: Niklas Cassel <cassel@kernel.org> --- drivers/pci/endpoint/functions/pci-epf-test.c | 18 ++++-------------- 1 file changed, 4 insertions(+), 14 deletions(-)