On 6/30/23 22:17, Rick Wertenbroek wrote:
A 32-bit mask was used on the 64-bit PCI address used for mapping MSIs. This would result in the upper 32 bits being unintentionally zeroed and MSIs getting mapped to incorrect PCI addresses if the address had any of the upper bits set.
Replace 32-bit mask by appropriate 64-bit mask and rename 32-bit mask for clarity.
Fixes: dc73ed0f1b8b ("PCI: rockchip: Fix window mapping and address translation for endpoint") Reported-by: Dan Carpenter dan.carpenter@linaro.org Closes: https://lore.kernel.org/linux-pci/8d19e5b7-8fa0-44a4-90e2-9bb06f5eb694@morot... Signed-off-by: Rick Wertenbroek rick.wertenbroek@gmail.com Cc: stable@vger.kernel.org
drivers/pci/controller/pcie-rockchip-ep.c | 12 ++++++------ drivers/pci/controller/pcie-rockchip.h | 6 +++--- 2 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c index 0af0e965fb57..313face6a87f 100644 --- a/drivers/pci/controller/pcie-rockchip-ep.c +++ b/drivers/pci/controller/pcie-rockchip-ep.c @@ -354,7 +354,7 @@ static int rockchip_pcie_ep_send_msi_irq(struct rockchip_pcie_ep *ep, u8 fn, struct rockchip_pcie *rockchip = &ep->rockchip; u32 flags, mme, data, data_mask; u8 msi_count;
- u64 pci_addr;
- u64 pci_addr, pci_addr_mask = GENMASK(63, 8);
I think you can simplify all this with only the change to the definition of PCIE_ADDR_MASK macro. Applying a 64 bits mask for low bits to a 32-bits variable is OK and should not generate any complaints from the compiler. Also, that "8" in the GENMASK can be replaced by MIN_AXI_ADDR_BITS_PASSED. So:
#define PCIE_ADDR_MASK GENMASK(63, MIN_AXI_ADDR_BITS_PASSED)
Would fix everything I think.
If it does not, I would prefer you define a macro for that GENMASK(63, 8) mask instead of using a variable on stack. That would be more efficient code wise, removing a memory access.
u32 r; /* Check MSI enable bit */ @@ -391,18 +391,18 @@ static int rockchip_pcie_ep_send_msi_irq(struct rockchip_pcie_ep *ep, u8 fn, PCI_MSI_ADDRESS_LO); /* Set the outbound region if needed. */
- if (unlikely(ep->irq_pci_addr != (pci_addr & PCIE_ADDR_MASK) ||
- if (unlikely(ep->irq_pci_addr != (pci_addr & pci_addr_mask) || ep->irq_pci_fn != fn)) { r = rockchip_ob_region(ep->irq_phys_addr); rockchip_pcie_prog_ep_ob_atu(rockchip, fn, r, ep->irq_phys_addr,
pci_addr & PCIE_ADDR_MASK,~PCIE_ADDR_MASK + 1);ep->irq_pci_addr = (pci_addr & PCIE_ADDR_MASK);
pci_addr & pci_addr_mask,~pci_addr_mask + 1);ep->irq_pci_addr = (pci_addr & pci_addr_mask);
- writew(data, ep->irq_cpu_addr + (pci_addr & ~PCIE_ADDR_MASK));
- writew(data, ep->irq_cpu_addr + (pci_addr & ~pci_addr_mask)); return 0;
} diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h index fe0333778fd9..2d7b05f07b7e 100644 --- a/drivers/pci/controller/pcie-rockchip.h +++ b/drivers/pci/controller/pcie-rockchip.h @@ -158,11 +158,11 @@ #define PCIE_RC_CONFIG_THP_CAP (PCIE_RC_CONFIG_BASE + 0x274) #define PCIE_RC_CONFIG_THP_CAP_NEXT_MASK GENMASK(31, 20) -#define PCIE_ADDR_MASK 0xffffff00 +#define PCIE_LO_ADDR_MASK GENMASK(31, 8) #define PCIE_CORE_AXI_CONF_BASE 0xc00000 #define PCIE_CORE_OB_REGION_ADDR0 (PCIE_CORE_AXI_CONF_BASE + 0x0) #define PCIE_CORE_OB_REGION_ADDR0_NUM_BITS 0x3f -#define PCIE_CORE_OB_REGION_ADDR0_LO_ADDR PCIE_ADDR_MASK +#define PCIE_CORE_OB_REGION_ADDR0_LO_ADDR PCIE_LO_ADDR_MASK #define PCIE_CORE_OB_REGION_ADDR1 (PCIE_CORE_AXI_CONF_BASE + 0x4) #define PCIE_CORE_OB_REGION_DESC0 (PCIE_CORE_AXI_CONF_BASE + 0x8) #define PCIE_CORE_OB_REGION_DESC1 (PCIE_CORE_AXI_CONF_BASE + 0xc) @@ -170,7 +170,7 @@ #define PCIE_CORE_AXI_INBOUND_BASE 0xc00800 #define PCIE_RP_IB_ADDR0 (PCIE_CORE_AXI_INBOUND_BASE + 0x0) #define PCIE_CORE_IB_REGION_ADDR0_NUM_BITS 0x3f -#define PCIE_CORE_IB_REGION_ADDR0_LO_ADDR PCIE_ADDR_MASK +#define PCIE_CORE_IB_REGION_ADDR0_LO_ADDR PCIE_LO_ADDR_MASK #define PCIE_RP_IB_ADDR1 (PCIE_CORE_AXI_INBOUND_BASE + 0x4) /* Size of one AXI Region (not Region 0) */