On Tue, Jan 30, 2024 at 08:32:10PM +0100, Niklas Cassel wrote: > pci_epf_alloc_space() already performs checks on the requested BAR size, > and will allocate and set epf_bar->size to a size higher than the > requested BAR size if some constraint deems it necessary. > > However, other than pci_epf_alloc_space() performing these roundups, > there are checks and roundups in two different places in pci-epf-test.c. > > And further checks are proposed to other endpoint function drivers, see: > https://lore.kernel.org/linux-pci/20240108151015.2030469-1-Frank.Li@xxxxxxx/ > > Having these checks spread out at different places in the EPF driver > (and potentially in multiple EPF drivers) is not maintainable and makes > the code hard to follow. > > Since pci_epf_alloc_space() already performs roundups, move the checks and > roundups performed by pci-epf-test.c to pci_epf_alloc_space(). > > Signed-off-by: Niklas Cassel <cassel@xxxxxxxxxx> > --- > drivers/pci/endpoint/functions/pci-epf-test.c | 8 -------- > drivers/pci/endpoint/pci-epf-core.c | 10 +++++++++- > 2 files changed, 9 insertions(+), 9 deletions(-) > > diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c > index 15bfa7d83489..981894e40681 100644 > --- a/drivers/pci/endpoint/functions/pci-epf-test.c > +++ b/drivers/pci/endpoint/functions/pci-epf-test.c > @@ -841,12 +841,6 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf) > } > test_reg_size = test_reg_bar_size + msix_table_size + pba_size; > > - if (epc_features->bar_fixed_size[test_reg_bar]) { > - if (test_reg_size > bar_size[test_reg_bar]) > - return -ENOMEM; > - test_reg_size = bar_size[test_reg_bar]; > - } > - > base = pci_epf_alloc_space(epf, test_reg_size, test_reg_bar, > epc_features, PRIMARY_INTERFACE); > if (!base) { > @@ -888,8 +882,6 @@ static void pci_epf_configure_bar(struct pci_epf *epf, > bar_fixed_64bit = !!(epc_features->bar_fixed_64bit & (1 << i)); > if (bar_fixed_64bit) > epf_bar->flags |= PCI_BASE_ADDRESS_MEM_TYPE_64; > - if (epc_features->bar_fixed_size[i]) > - bar_size[i] = epc_features->bar_fixed_size[i]; > } > } > > diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c > index e44f4078fe8b..37d9651d2026 100644 > --- a/drivers/pci/endpoint/pci-epf-core.c > +++ b/drivers/pci/endpoint/pci-epf-core.c > @@ -260,6 +260,7 @@ void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar, > const struct pci_epc_features *epc_features, > enum pci_epc_interface_type type) > { > + u64 bar_fixed_size = epc_features->bar_fixed_size[bar]; > size_t align = epc_features->align; > struct pci_epf_bar *epf_bar; > dma_addr_t phys_addr; > @@ -270,7 +271,14 @@ void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar, > if (size < 128) > size = 128; > > - if (align) > + if (bar_fixed_size && size > bar_fixed_size) { > + dev_err(dev, "requested BAR size is larger than fixed size\n"); > + return NULL; > + } > + > + if (bar_fixed_size) > + size = bar_fixed_size; > + else if (align) > size = ALIGN(size, align); > else > size = roundup_pow_of_two(size); We actually need to perform the alignment even for fixed size BARs too, since some platforms have fixed_size_bars that are smaller than the iATU MIN REGION. Will fix in v2. Kind regards, Niklas
