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Message-Id: <77b7b2687e9618d3f7d1f11c3fc6ecec9a9442ef.1523379766.git.gustavo.pimentel@synopsys.com>
Date: Tue, 10 Apr 2018 18:14:40 +0100
From: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
To: bhelgaas@...gle.com, lorenzo.pieralisi@....com,
Joao.Pinto@...opsys.com, jingoohan1@...il.com, kishon@...com,
adouglas@...ence.com, niklas.cassel@...s.com,
jesper.nilsson@...s.com
Cc: linux-pci@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, gustavo.pimentel@...opsys.com
Subject: [RFC 01/10] PCI: dwc: Add MSI-X callbacks handler
Changes the pcie_raise_irq function signature, namely the interrupt_num
variable type from u8 to u16 to accommodate the MSI-X maximum interrupts
of 2048.
Implements a PCIe config space capability iterator function to search and
save the MSI and MSI-X pointers. With this method the code becomes more
generic and flexible.
Implements MSI-X set/get functions for sysfs interface in order to change
the EP entries number.
Implements EP MSI-X interface for triggering interruptions.
Signed-off-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
---
drivers/pci/dwc/pci-dra7xx.c | 2 +-
drivers/pci/dwc/pcie-artpec6.c | 2 +-
drivers/pci/dwc/pcie-designware-ep.c | 145 ++++++++++++++++++++++++++++++++-
drivers/pci/dwc/pcie-designware-plat.c | 6 +-
drivers/pci/dwc/pcie-designware.h | 23 +++++-
5 files changed, 173 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index ed8558d..5265725 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -369,7 +369,7 @@ static void dra7xx_pcie_raise_msi_irq(struct dra7xx_pcie *dra7xx,
}
static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
- enum pci_epc_irq_type type, u8 interrupt_num)
+ enum pci_epc_irq_type type, u16 interrupt_num)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
diff --git a/drivers/pci/dwc/pcie-artpec6.c b/drivers/pci/dwc/pcie-artpec6.c
index e66cede..96dc259 100644
--- a/drivers/pci/dwc/pcie-artpec6.c
+++ b/drivers/pci/dwc/pcie-artpec6.c
@@ -428,7 +428,7 @@ static void artpec6_pcie_ep_init(struct dw_pcie_ep *ep)
}
static int artpec6_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
- enum pci_epc_irq_type type, u8 interrupt_num)
+ enum pci_epc_irq_type type, u16 interrupt_num)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
index 15b22a6..874d4c2 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -40,6 +40,44 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
__dw_pcie_ep_reset_bar(pci, bar, 0);
}
+void dw_pcie_ep_find_cap_addr(struct dw_pcie_ep *ep)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ u8 next_ptr, curr_ptr, cap_id;
+ u16 reg;
+
+ memset(&ep->cap_addr, 0, sizeof(ep->cap_addr));
+
+ reg = dw_pcie_readw_dbi(pci, PCI_STATUS);
+ if (!(reg & PCI_STATUS_CAP_LIST))
+ return;
+
+ reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST);
+ next_ptr = (reg & 0x00ff);
+ if (!next_ptr)
+ return;
+
+ reg = dw_pcie_readw_dbi(pci, next_ptr);
+ curr_ptr = next_ptr;
+ next_ptr = (reg & 0xff00) >> 8;
+ cap_id = (reg & 0x00ff);
+
+ while (next_ptr && (cap_id <= PCI_CAP_ID_MAX)) {
+ switch (cap_id) {
+ case PCI_CAP_ID_MSI:
+ ep->cap_addr.msi_addr = curr_ptr;
+ break;
+ case PCI_CAP_ID_MSIX:
+ ep->cap_addr.msix_addr = curr_ptr;
+ break;
+ }
+ reg = dw_pcie_readw_dbi(pci, next_ptr);
+ curr_ptr = next_ptr;
+ next_ptr = (reg & 0xff00) >> 8;
+ cap_id = (reg & 0x00ff);
+ }
+}
+
static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
struct pci_epf_header *hdr)
{
@@ -241,8 +279,47 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 func_no, u8 encode_int)
return 0;
}
+static int dw_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no)
+{
+ struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ u32 val, reg;
+
+ if (ep->cap_addr.msix_addr == 0)
+ return 0;
+
+ reg = ep->cap_addr.msix_addr + PCI_MSIX_FLAGS;
+ val = dw_pcie_readw_dbi(pci, reg);
+ if (!(val & PCI_MSIX_FLAGS_ENABLE))
+ return -EINVAL;
+
+ val &= PCI_MSIX_FLAGS_QSIZE;
+
+ return val;
+}
+
+static int dw_pcie_ep_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts)
+{
+ struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ u32 val, reg;
+
+ if (ep->cap_addr.msix_addr == 0)
+ return 0;
+
+ reg = ep->cap_addr.msix_addr + PCI_MSIX_FLAGS;
+ val = dw_pcie_readw_dbi(pci, reg);
+ val &= ~PCI_MSIX_FLAGS_QSIZE;
+ val |= interrupts;
+ dw_pcie_dbi_ro_wr_en(pci);
+ dw_pcie_writew_dbi(pci, reg, val);
+ dw_pcie_dbi_ro_wr_dis(pci);
+
+ return 0;
+}
+
static int dw_pcie_ep_raise_irq(struct pci_epc *epc, u8 func_no,
- enum pci_epc_irq_type type, u8 interrupt_num)
+ enum pci_epc_irq_type type, u16 interrupt_num)
{
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
@@ -282,6 +359,8 @@ static const struct pci_epc_ops epc_ops = {
.unmap_addr = dw_pcie_ep_unmap_addr,
.set_msi = dw_pcie_ep_set_msi,
.get_msi = dw_pcie_ep_get_msi,
+ .set_msix = dw_pcie_ep_set_msix,
+ .get_msix = dw_pcie_ep_get_msix,
.raise_irq = dw_pcie_ep_raise_irq,
.start = dw_pcie_ep_start,
.stop = dw_pcie_ep_stop,
@@ -322,6 +401,60 @@ int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
return 0;
}
+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_epc *epc = ep->epc;
+ u16 tbl_offset, bir;
+ u32 bar_addr_upper, bar_addr_lower;
+ u32 msg_addr_upper, msg_addr_lower;
+ u32 reg, msg_data;
+ u64 tbl_addr, msg_addr, reg_u64;
+ void __iomem *msix_tbl;
+ int ret;
+
+ reg = ep->cap_addr.msix_addr + PCI_MSIX_TABLE;
+ tbl_offset = dw_pcie_readl_dbi(pci, reg);
+ bir = (tbl_offset & PCI_MSIX_TABLE_BIR);
+ tbl_offset &= PCI_MSIX_TABLE_OFFSET;
+ tbl_offset >>= 3;
+
+ reg = PCI_BASE_ADDRESS_0 + (4 * bir);
+ 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);
+ else
+ bar_addr_upper = 0;
+
+ 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, ep->addr_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);
+
+ iounmap(msix_tbl);
+
+ ret = dw_pcie_ep_map_addr(epc, func_no, ep->msix_mem_phys, msg_addr,
+ epc->mem->page_size);
+ if (ret)
+ return ret;
+
+ writel(msg_data, ep->msix_mem);
+
+ dw_pcie_ep_unmap_addr(epc, func_no, ep->msix_mem_phys);
+
+ return 0;
+}
+
void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
{
struct pci_epc *epc = ep->epc;
@@ -329,6 +462,9 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
epc->mem->page_size);
+ pci_epc_mem_free_addr(epc, ep->msix_mem_phys, ep->msix_mem,
+ epc->mem->page_size);
+
pci_epc_mem_exit(epc);
}
@@ -411,6 +547,13 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
return -ENOMEM;
}
+ ep->msix_mem = pci_epc_mem_alloc_addr(epc, &ep->msix_mem_phys,
+ epc->mem->page_size);
+ if (!ep->msix_mem) {
+ dev_err(dev, "Failed to reserve memory for MSI-\n");
+ return -ENOMEM;
+ }
+
ep->epc = epc;
epc_set_drvdata(epc, ep);
dw_pcie_setup(pci);
diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
index 2bad68d..c3a4707 100644
--- a/drivers/pci/dwc/pcie-designware-plat.c
+++ b/drivers/pci/dwc/pcie-designware-plat.c
@@ -74,11 +74,13 @@ static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
for (bar = BAR_0; bar <= BAR_5; bar++)
dw_pcie_ep_reset_bar(pci, bar);
+
+ dw_pcie_ep_find_cap_addr(ep);
}
static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
enum pci_epc_irq_type type,
- u8 interrupt_num)
+ u16 interrupt_num)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
@@ -88,6 +90,8 @@ static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
return -EINVAL;
case PCI_EPC_IRQ_MSI:
return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+ case PCI_EPC_IRQ_MSIX:
+ return dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num);
default:
dev_err(pci->dev, "UNKNOWN IRQ type\n");
}
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index bee4e25..456fd94 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -191,7 +191,12 @@ enum dw_pcie_as_type {
struct dw_pcie_ep_ops {
void (*ep_init)(struct dw_pcie_ep *ep);
int (*raise_irq)(struct dw_pcie_ep *ep, u8 func_no,
- enum pci_epc_irq_type type, u8 interrupt_num);
+ enum pci_epc_irq_type type, u16 interrupt_num);
+};
+
+struct dw_pcie_cap_addr {
+ u8 msi_addr;
+ u8 msix_addr;
};
struct dw_pcie_ep {
@@ -208,6 +213,9 @@ struct dw_pcie_ep {
u32 num_ob_windows;
void __iomem *msi_mem;
phys_addr_t msi_mem_phys;
+ void __iomem *msix_mem;
+ phys_addr_t msix_mem_phys;
+ struct dw_pcie_cap_addr cap_addr;
};
struct dw_pcie_ops {
@@ -359,7 +367,10 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep);
void dw_pcie_ep_exit(struct dw_pcie_ep *ep);
int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
u8 interrupt_num);
+int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
+ u16 interrupt_num);
void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar);
+void dw_pcie_ep_find_cap_addr(struct dw_pcie_ep *ep);
#else
static inline void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
{
@@ -380,8 +391,18 @@ static inline int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
return 0;
}
+static inline int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
+ u16 interrupt_num)
+{
+ return 0;
+}
+
static inline void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
{
}
+
+static inline void dw_pcie_ep_find_cap_addr(struct dw_pcie_ep *ep)
+{
+}
#endif
#endif /* _PCIE_DESIGNWARE_H */
--
2.7.4
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