From 10eb2cc3442aa9a91c98f2fdda2a5b48de9bbc88 Mon Sep 17 00:00:00 2001 From: Marek Behún Date: Mon, 8 Feb 2021 23:01:40 +0100 Subject: pci: pci_mvebu: refactor validation of addresses for config access MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Refactor validation of bdf parameter in mvebu_pcie_read/write_config functions. We can simplify the code by putting the validation into separate function. Also there are always only two devices visible on local bus: * on slot configured by function mvebu_pcie_set_local_dev_nr() (by default this register is set to 0) there is a "Marvell Memory controller", which isn't useful in root complex mode, * on all other slots the real PCIe card connected to the PCIe slot. We can simplify the code even more by simply allowing access only to the real PCIe card. Signed-off-by: Marek Behún Cc: Stefan Roese Cc: Phil Sutter Cc: Mario Six Cc: Baruch Siach Reviewed-by: Stefan Roese --- drivers/pci/pci_mvebu.c | 59 ++++++++++++++++++++++++++----------------------- 1 file changed, 31 insertions(+), 28 deletions(-) diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c index 8e674bbef2..54f8e8b9ec 100644 --- a/drivers/pci/pci_mvebu.c +++ b/drivers/pci/pci_mvebu.c @@ -79,7 +79,8 @@ struct mvebu_pcie { u32 lane; int devfn; u32 lane_mask; - pci_dev_t dev; + int first_busno; + int local_dev; char name[16]; unsigned int mem_target; unsigned int mem_attr; @@ -144,27 +145,36 @@ static inline struct mvebu_pcie *hose_to_pcie(struct pci_controller *hose) return container_of(hose, struct mvebu_pcie, hose); } +static int mvebu_pcie_valid_addr(struct mvebu_pcie *pcie, pci_dev_t bdf) +{ + /* + * There are two devices visible on local bus: + * * on slot configured by function mvebu_pcie_set_local_dev_nr() + * (by default this register is set to 0) there is a + * "Marvell Memory controller", which isn't useful in root complex + * mode, + * * on all other slots the real PCIe card connected to the PCIe slot. + * + * We therefore allow access only to the real PCIe card. + */ + if (PCI_BUS(bdf) == pcie->first_busno && + PCI_DEV(bdf) != !pcie->local_dev) + return 0; + + return 1; +} + static int mvebu_pcie_read_config(const struct udevice *bus, pci_dev_t bdf, uint offset, ulong *valuep, enum pci_size_t size) { struct mvebu_pcie *pcie = dev_get_plat(bus); - int local_bus = PCI_BUS(pcie->dev); - int local_dev = PCI_DEV(pcie->dev); u32 data; - debug("PCIE CFG read: loc_bus=%d loc_dev=%d (b,d,f)=(%2d,%2d,%2d) ", - local_bus, local_dev, PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); + debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ", + PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); - /* Don't access the local host controller via this API */ - if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) == local_dev) { - debug("- skipping host controller\n"); - *valuep = pci_get_ff(size); - return 0; - } - - /* If local dev is 0, the first other dev can only be 1 */ - if (PCI_BUS(bdf) == local_bus && local_dev == 0 && PCI_DEV(bdf) != 1) { + if (!mvebu_pcie_valid_addr(pcie, bdf)) { debug("- out of range\n"); *valuep = pci_get_ff(size); return 0; @@ -186,22 +196,13 @@ static int mvebu_pcie_write_config(struct udevice *bus, pci_dev_t bdf, enum pci_size_t size) { struct mvebu_pcie *pcie = dev_get_plat(bus); - int local_bus = PCI_BUS(pcie->dev); - int local_dev = PCI_DEV(pcie->dev); u32 data; - debug("PCIE CFG write: loc_bus=%d loc_dev=%d (b,d,f)=(%2d,%2d,%2d) ", - local_bus, local_dev, PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); + debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ", + PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf)); debug("(addr,size,val)=(0x%04x, %d, 0x%08lx)\n", offset, size, value); - /* Don't access the local host controller via this API */ - if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) == local_dev) { - debug("- skipping host controller\n"); - return 0; - } - - /* If local dev is 0, the first other dev can only be 1 */ - if (PCI_BUS(bdf) == local_bus && local_dev == 0 && PCI_DEV(bdf) != 1) { + if (!mvebu_pcie_valid_addr(pcie, bdf)) { debug("- out of range\n"); return 0; } @@ -287,9 +288,11 @@ static int mvebu_pcie_probe(struct udevice *dev) readl(pcie->base), mvebu_pcie_get_local_bus_nr(pcie), mvebu_pcie_get_local_dev_nr(pcie)); + pcie->first_busno = bus; + pcie->local_dev = 0; + mvebu_pcie_set_local_bus_nr(pcie, bus); - mvebu_pcie_set_local_dev_nr(pcie, 0); - pcie->dev = PCI_BDF(bus, 0, 0); + mvebu_pcie_set_local_dev_nr(pcie, pcie->local_dev); pcie->mem.start = (u32)mvebu_pcie_membase; pcie->mem.end = pcie->mem.start + PCIE_MEM_SIZE - 1; -- cgit v1.2.3