diff options
| author |   Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2022-06-24 17:39:45 +0300 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2022-08-01 15:15:32 -0500 |
| commit | edf408b946d37cc70fbf0db6ab85bbf67dae1894 (patch) | |
| tree | 275dcd54ccc93a42be14ddeced78c7815d1c4799 /drivers/pci/controller/dwc/pcie-designware.c | |
| parent | PCI: dwc: Add iATU regions size detection procedure (diff) | |
| download | wireguard-linux-edf408b946d37cc70fbf0db6ab85bbf67dae1894.tar.xz wireguard-linux-edf408b946d37cc70fbf0db6ab85bbf67dae1894.zip | |
PCI: dwc: Validate iATU outbound mappings against hardware constraints
Make __dw_pcie_prog_outbound_atu() check the requested region base and size
against what the hardware can support. Return error if the region is not
correctly aligned or of a supported size.
[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20220624143947.8991-14-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-designware.c')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware.c | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index cb6244db9269..c6725c519a47 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -8,6 +8,7 @@ * Author: Jingoo Han <jg1.han@samsung.com> */ +#include <linux/align.h> #include <linux/bitops.h> #include <linux/delay.h> #include <linux/of.h> @@ -305,9 +306,9 @@ static inline u32 dw_pcie_enable_ecrc(u32 val) return val | PCIE_ATU_TD; } -static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no, - int index, int type, u64 cpu_addr, - u64 pci_addr, u64 size) +static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no, + int index, int type, u64 cpu_addr, + u64 pci_addr, u64 size) { u32 retries, val; u64 limit_addr; @@ -317,6 +318,12 @@ static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no, limit_addr = cpu_addr + size - 1; + if ((limit_addr & ~pci->region_limit) != (cpu_addr & ~pci->region_limit) || + !IS_ALIGNED(cpu_addr, pci->region_align) || + !IS_ALIGNED(pci_addr, pci->region_align) || !size) { + return -EINVAL; + } + dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_LOWER_BASE, lower_32_bits(cpu_addr)); dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_BASE, @@ -350,27 +357,29 @@ static void __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no, for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) { val = dw_pcie_readl_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2); if (val & PCIE_ATU_ENABLE) - return; + return 0; mdelay(LINK_WAIT_IATU); } dev_err(pci->dev, "Outbound iATU is not being enabled\n"); + + return -ETIMEDOUT; } -void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type, - u64 cpu_addr, u64 pci_addr, u64 size) +int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type, + u64 cpu_addr, u64 pci_addr, u64 size) { - __dw_pcie_prog_outbound_atu(pci, 0, index, type, - cpu_addr, pci_addr, size); + return __dw_pcie_prog_outbound_atu(pci, 0, index, type, + cpu_addr, pci_addr, size); } -void dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index, - int type, u64 cpu_addr, u64 pci_addr, - u64 size) +int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index, + int type, u64 cpu_addr, u64 pci_addr, + u64 size) { - __dw_pcie_prog_outbound_atu(pci, func_no, index, type, - cpu_addr, pci_addr, size); + return __dw_pcie_prog_outbound_atu(pci, func_no, index, type, + cpu_addr, pci_addr, size); } static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg) @@ -389,6 +398,9 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index, { u32 retries, val; + if (!IS_ALIGNED(cpu_addr, pci->region_align)) + return -EINVAL; + dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_LOWER_TARGET, lower_32_bits(cpu_addr)); dw_pcie_writel_atu_ib(pci, index, PCIE_ATU_UPPER_TARGET, |