linux-kernel - Re: [PATCH v2] PCI: endpoint: Allocate enough space for fixed size BAR

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Date:   Thu, 23 May 2019 16:56:06 -0700
From:   Alan Mikhak <alan.mikhak@...ive.com>
To:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kishon@...com, lorenzo.pieralisi@....com,
        linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        gustavo.pimentel@...opsys.com, wen.yang99@....com.cn, kjlu@....edu
Subject: Re: [PATCH v2] PCI: endpoint: Allocate enough space for fixed size BAR

+Bjorn Helgaas, +Gustavo Pimentel, +Wen Yang, +Kangjie Lu

On Thu, May 23, 2019 at 2:48 PM Alan Mikhak <alan.mikhak@...ive.com> wrote:
>
> PCI endpoint test function code should honor the .bar_fixed_size parameter
> from underlying endpoint controller drivers or results may be unexpected.
>
> In pci_epf_test_alloc_space(), check if BAR being used for test register
> space is a fixed size BAR. If so, allocate the required fixed size.
>
> Signed-off-by: Alan Mikhak <alan.mikhak@...ive.com>
> ---
>  drivers/pci/endpoint/functions/pci-epf-test.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 27806987e93b..7d41e6684b87 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -434,10 +434,16 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
>         int bar;
>         enum pci_barno test_reg_bar = epf_test->test_reg_bar;
>         const struct pci_epc_features *epc_features;
> +       size_t test_reg_size;
>
>         epc_features = epf_test->epc_features;
>
> -       base = pci_epf_alloc_space(epf, sizeof(struct pci_epf_test_reg),
> +       if (epc_features->bar_fixed_size[test_reg_bar])
> +               test_reg_size = bar_size[test_reg_bar];
> +       else
> +               test_reg_size = sizeof(struct pci_epf_test_reg);
> +
> +       base = pci_epf_alloc_space(epf, test_reg_size,
>                                    test_reg_bar, epc_features->align);
>         if (!base) {
>                 dev_err(dev, "Failed to allocated register space\n");
> --
> 2.7.4
>