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SubjectRe: [PATCH v4 1/5] PCI: endpoint: BAR width should not depend on sizeof dma_addr_t
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On Thursday 08 March 2018 07:03 PM, Niklas Cassel wrote:
> If a BAR supports 64-bit width or not depends on the hardware,
> and should thus not depend on sizeof(dma_addr_t).
>
> Since this driver is generic, default to always using BAR width
> of 32-bits. 64-bit BARs can easily be tested by replacing
> PCI_BASE_ADDRESS_MEM_TYPE_32 with PCI_BASE_ADDRESS_MEM_TYPE_64
> in bar_flags.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>

Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
> Note to Lorenzo/Bjorn:
> It is not trivial to convert the bar_size + bar_flags +
> struct pci_epf->bar member array to an array of struct resources,
> since we need to be able to store the addresses returned
> by dma_alloc_coherent(), which is of type dma_addr_t.
> struct resource uses resource_size_t, which is defined as phys_addr_t.
> E.g. ARTPEC-7 uses 64-bit dma_addr_t, but only 32-bit phys_addr_t.
>
> drivers/pci/endpoint/functions/pci-epf-test.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 800da09d9005..7c70433b11a7 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -71,6 +71,14 @@ struct pci_epf_test_data {
> };
>
> static int bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };
> +static int bar_flags[] = {
> + PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32,
> + PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32,
> + PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32,
> + PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32,
> + PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32,
> + PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32
> +};
>
> static int pci_epf_test_copy(struct pci_epf_test *epf_test)
> {
> @@ -358,7 +366,6 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
>
> static int pci_epf_test_set_bar(struct pci_epf *epf)
> {
> - int flags;
> int bar;
> int ret;
> struct pci_epf_bar *epf_bar;
> @@ -367,15 +374,11 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
> struct pci_epf_test *epf_test = epf_get_drvdata(epf);
> enum pci_barno test_reg_bar = epf_test->test_reg_bar;
>
> - flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
> - if (sizeof(dma_addr_t) == 0x8)
> - flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
> -
> for (bar = BAR_0; bar <= BAR_5; bar++) {
> epf_bar = &epf->bar[bar];
> ret = pci_epc_set_bar(epc, epf->func_no, bar,
> epf_bar->phys_addr,
> - epf_bar->size, flags);
> + epf_bar->size, bar_flags[bar]);
> if (ret) {
> pci_epf_free_space(epf, epf_test->reg[bar], bar);
> dev_err(dev, "failed to set BAR%d\n", bar);
>

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