@@ -125,6 +125,7 @@ static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_INBOUND);
clear_bit(atu_index, ep->ib_window_map);
+ ep->epf_bar[bar] = NULL;
}
static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
@@ -158,6 +159,7 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
dw_pcie_writel_dbi(pci, reg + 4, 0);
}
+ ep->epf_bar[bar] = epf_bar;
dw_pcie_dbi_ro_wr_dis(pci);
return 0;
@@ -420,55 +422,41 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
u16 interrupt_num)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ struct pci_epf_msix_tbl *msix_tbl;
struct pci_epc *epc = ep->epc;
- u16 tbl_offset, bir;
- u32 bar_addr_upper, bar_addr_lower;
- u32 msg_addr_upper, msg_addr_lower;
+ struct pci_epf_bar *epf_bar;
u32 reg, msg_data, vec_ctrl;
- u64 tbl_addr, msg_addr, reg_u64;
- void __iomem *msix_tbl;
+ unsigned int aligned_offset;
+ u32 tbl_offset;
+ u64 msg_addr;
int ret;
+ u8 bir;
reg = ep->msix_cap + PCI_MSIX_TABLE;
tbl_offset = dw_pcie_readl_dbi(pci, reg);
bir = (tbl_offset & PCI_MSIX_TABLE_BIR);
tbl_offset &= PCI_MSIX_TABLE_OFFSET;
- reg = PCI_BASE_ADDRESS_0 + (4 * bir);
- bar_addr_upper = 0;
- bar_addr_lower = dw_pcie_readl_dbi(pci, reg);
- reg_u64 = (bar_addr_lower & PCI_BASE_ADDRESS_MEM_TYPE_MASK);
- if (reg_u64 == PCI_BASE_ADDRESS_MEM_TYPE_64)
- bar_addr_upper = dw_pcie_readl_dbi(pci, reg + 4);
+ epf_bar = ep->epf_bar[bir];
+ msix_tbl = epf_bar->addr;
+ msix_tbl = (struct pci_epf_msix_tbl *)((char *)msix_tbl + tbl_offset);
- tbl_addr = ((u64) bar_addr_upper) << 32 | bar_addr_lower;
- tbl_addr += (tbl_offset + ((interrupt_num - 1) * PCI_MSIX_ENTRY_SIZE));
- tbl_addr &= PCI_BASE_ADDRESS_MEM_MASK;
-
- msix_tbl = ioremap_nocache(ep->phys_base + tbl_addr,
- PCI_MSIX_ENTRY_SIZE);
- if (!msix_tbl)
- return -EINVAL;
-
- msg_addr_lower = readl(msix_tbl + PCI_MSIX_ENTRY_LOWER_ADDR);
- msg_addr_upper = readl(msix_tbl + PCI_MSIX_ENTRY_UPPER_ADDR);
- msg_addr = ((u64) msg_addr_upper) << 32 | msg_addr_lower;
- msg_data = readl(msix_tbl + PCI_MSIX_ENTRY_DATA);
- vec_ctrl = readl(msix_tbl + PCI_MSIX_ENTRY_VECTOR_CTRL);
-
- iounmap(msix_tbl);
+ msg_addr = msix_tbl[(interrupt_num - 1)].msg_addr;
+ msg_data = msix_tbl[(interrupt_num - 1)].msg_data;
+ vec_ctrl = msix_tbl[(interrupt_num - 1)].vector_ctrl;
if (vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT) {
dev_dbg(pci->dev, "MSI-X entry ctrl set\n");
return -EPERM;
}
- ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
+ aligned_offset = msg_addr & (epc->mem->page_size - 1);
+ ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
epc->mem->page_size);
if (ret)
return ret;
- writel(msg_data, ep->msi_mem);
+ writel(msg_data, ep->msi_mem + aligned_offset);
dw_pcie_ep_unmap_addr(epc, func_no, ep->msi_mem_phys);
@@ -224,6 +224,7 @@ struct dw_pcie_ep {
phys_addr_t msi_mem_phys;
u8 msi_cap; /* MSI capability offset */
u8 msix_cap; /* MSI-X capability offset */
+ struct pci_epf_bar *epf_bar[PCI_STD_NUM_BARS];
};
struct dw_pcie_ops {
@@ -99,6 +99,7 @@ void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar)
epf->bar[bar].phys_addr);
epf->bar[bar].phys_addr = 0;
+ epf->bar[bar].addr = NULL;
epf->bar[bar].size = 0;
epf->bar[bar].barno = 0;
epf->bar[bar].flags = 0;
@@ -135,6 +136,7 @@ void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
}
epf->bar[bar].phys_addr = phys_addr;
+ epf->bar[bar].addr = space;
epf->bar[bar].size = size;
epf->bar[bar].barno = bar;
epf->bar[bar].flags |= upper_32_bits(size) ?
@@ -92,10 +92,12 @@ struct pci_epf_driver {
/**
* struct pci_epf_bar - represents the BAR of EPF device
* @phys_addr: physical address that should be mapped to the BAR
+ * @addr: virtual address corresponding to the @phys_addr
* @size: the size of the address space present in BAR
*/
struct pci_epf_bar {
dma_addr_t phys_addr;
+ void *addr;
size_t size;
enum pci_barno barno;
int flags;
@@ -127,6 +129,19 @@ struct pci_epf {
struct list_head list;
};
+/**
+ * struct pci_epf_msix_tbl - represents the MSIX table entry structure
+ * @msg_addr: Writes to this address will trigger MSIX interrupt in host
+ * @msg_data: Data that should be written to @msg_addr to trigger MSIX interrupt
+ * @vector_ctrl: Identifies if the function is prohibited from sending a message
+ * using this MSIX table entry
+ */
+struct pci_epf_msix_tbl {
+ u64 msg_addr;
+ u32 msg_data;
+ u32 vector_ctrl;
+};
+
#define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
#define pci_epf_register_driver(driver) \
commit beb4641a787df79a14 ("PCI: dwc: Add MSI-X callbacks handler"), in order to raise MSIX interrupt, obtained MSIX table address from Base Address Register (BAR). However BAR only holds PCI address programmed by the host whereas the MSIX table should be in the local memory. Store the MSIX table address (virtual address) as part of ->set_bar() callback and use that to get the message address and message data here. Fixes: commit beb4641a787df79a14 ("PCI: dwc: Add MSI-X callbacks handler") Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> --- .../pci/controller/dwc/pcie-designware-ep.c | 46 +++++++------------ drivers/pci/controller/dwc/pcie-designware.h | 1 + drivers/pci/endpoint/pci-epf-core.c | 2 + include/linux/pci-epf.h | 15 ++++++ 4 files changed, 35 insertions(+), 29 deletions(-)