From: Kishon Vijay Abraham I <kishon@ti.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kishon Vijay Abraham I <kishon@ti.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Arnd Bergmann <arnd@arndb.de>, Jon Mason <jdmason@kudzu.us>,
Dave Jiang <dave.jiang@intel.com>,
Allen Hubbe <allenbh@gmail.com>, Tom Joseph <tjoseph@cadence.com>,
Rob Herring <robh@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
<linux-pci@vger.kernel.org>, <linux-doc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-ntb@googlegroups.com>
Subject: [PATCH v11 08/17] PCI: endpoint: Add pci_epc_ops to map MSI irq
Date: Tue, 2 Feb 2021 01:28:00 +0530 [thread overview]
Message-ID: <20210201195809.7342-9-kishon@ti.com> (raw)
In-Reply-To: <20210201195809.7342-1-kishon@ti.com>
Add pci_epc_ops to map physical address to MSI address and return MSI
data. The physical address is an address in the outbound region. This is
required to implement doorbell functionality of NTB (non transparent
bridge) wherein EPC on either side of the interface (primary and
secondary) can directly write to the physical address (in outbound
region) of the other interface to ring doorbell using MSI.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/endpoint/pci-epc-core.c | 41 +++++++++++++++++++++++++++++
include/linux/pci-epc.h | 8 ++++++
2 files changed, 49 insertions(+)
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 3693eca5b030..cc8f9eb2b177 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -230,6 +230,47 @@ int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
}
EXPORT_SYMBOL_GPL(pci_epc_raise_irq);
+/**
+ * pci_epc_map_msi_irq() - Map physical address to MSI address and return
+ * MSI data
+ * @epc: the EPC device which has the MSI capability
+ * @func_no: the physical endpoint function number in the EPC device
+ * @phys_addr: the physical address of the outbound region
+ * @interrupt_num: the MSI interrupt number
+ * @entry_size: Size of Outbound address region for each interrupt
+ * @msi_data: the data that should be written in order to raise MSI interrupt
+ * with interrupt number as 'interrupt num'
+ * @msi_addr_offset: Offset of MSI address from the aligned outbound address
+ * to which the MSI address is mapped
+ *
+ * Invoke to map physical address to MSI address and return MSI data. The
+ * physical address should be an address in the outbound region. This is
+ * required to implement doorbell functionality of NTB wherein EPC on either
+ * side of the interface (primary and secondary) can directly write to the
+ * physical address (in outbound region) of the other interface to ring
+ * doorbell.
+ */
+int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, phys_addr_t phys_addr,
+ u8 interrupt_num, u32 entry_size, u32 *msi_data,
+ u32 *msi_addr_offset)
+{
+ int ret;
+
+ if (IS_ERR_OR_NULL(epc))
+ return -EINVAL;
+
+ if (!epc->ops->map_msi_irq)
+ return -EINVAL;
+
+ mutex_lock(&epc->lock);
+ ret = epc->ops->map_msi_irq(epc, func_no, phys_addr, interrupt_num,
+ entry_size, msi_data, msi_addr_offset);
+ mutex_unlock(&epc->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pci_epc_map_msi_irq);
+
/**
* pci_epc_get_msi() - get the number of MSI interrupt numbers allocated
* @epc: the EPC device to which MSI interrupts was requested
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index d9cb3944fb87..b82c9b100e97 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -55,6 +55,7 @@ pci_epc_interface_string(enum pci_epc_interface_type type)
* @get_msix: ops to get the number of MSI-X interrupts allocated by the RC
* from the MSI-X capability register
* @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
+ * @map_msi_irq: ops to map physical address to MSI address and return MSI data
* @start: ops to start the PCI link
* @stop: ops to stop the PCI link
* @owner: the module owner containing the ops
@@ -77,6 +78,10 @@ struct pci_epc_ops {
int (*get_msix)(struct pci_epc *epc, u8 func_no);
int (*raise_irq)(struct pci_epc *epc, u8 func_no,
enum pci_epc_irq_type type, u16 interrupt_num);
+ int (*map_msi_irq)(struct pci_epc *epc, u8 func_no,
+ phys_addr_t phys_addr, u8 interrupt_num,
+ u32 entry_size, u32 *msi_data,
+ u32 *msi_addr_offset);
int (*start)(struct pci_epc *epc);
void (*stop)(struct pci_epc *epc);
const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
@@ -216,6 +221,9 @@ int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts,
enum pci_barno, u32 offset);
int pci_epc_get_msix(struct pci_epc *epc, u8 func_no);
+int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no,
+ phys_addr_t phys_addr, u8 interrupt_num,
+ u32 entry_size, u32 *msi_data, u32 *msi_addr_offset);
int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
enum pci_epc_irq_type type, u16 interrupt_num);
int pci_epc_start(struct pci_epc *epc);
--
2.17.1
next prev parent reply other threads:[~2021-02-01 20:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 19:57 [PATCH v11 00/17] Implement NTB Controller using multiple PCI EP Kishon Vijay Abraham I
2021-02-01 19:57 ` [PATCH v11 01/17] Documentation: PCI: Add specification for the *PCI NTB* function device Kishon Vijay Abraham I
2021-02-01 19:57 ` [PATCH v11 02/17] PCI: endpoint: Make *_get_first_free_bar() take into account 64 bit BAR Kishon Vijay Abraham I
2021-02-01 19:57 ` [PATCH v11 03/17] PCI: endpoint: Add helper API to get the 'next' unreserved BAR Kishon Vijay Abraham I
2021-02-01 19:57 ` [PATCH v11 04/17] PCI: endpoint: Make *_free_bar() to return error codes on failure Kishon Vijay Abraham I
2021-02-01 19:57 ` [PATCH v11 05/17] PCI: endpoint: Remove unused pci_epf_match_device() Kishon Vijay Abraham I
2021-02-01 19:57 ` [PATCH v11 06/17] PCI: endpoint: Add support to associate secondary EPC with EPF Kishon Vijay Abraham I
2021-02-01 19:57 ` [PATCH v11 07/17] PCI: endpoint: Add support in configfs to associate two EPCs " Kishon Vijay Abraham I
2021-02-01 19:58 ` Kishon Vijay Abraham I [this message]
2021-02-01 19:58 ` [PATCH v11 09/17] PCI: endpoint: Add pci_epf_ops for epf drivers to expose function specific attrs Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 10/17] PCI: endpoint: Allow user to create sub-directory of 'EPF Device' directory Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 11/17] PCI: cadence: Implement ->msi_map_irq() ops Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 12/17] PCI: cadence: Configure LM_EP_FUNC_CFG based on epc->function_num_map Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 13/17] PCI: endpoint: Add EP function driver to provide NTB functionality Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 14/17] PCI: Add TI J721E device to pci ids Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 15/17] NTB: Add support for EPF PCI-Express Non-Transparent Bridge Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 16/17] Documentation: PCI: Add configfs binding documentation for pci-ntb endpoint function Kishon Vijay Abraham I
2021-02-01 19:58 ` [PATCH v11 17/17] Documentation: PCI: Add userguide for PCI endpoint NTB function Kishon Vijay Abraham I
2021-02-01 22:03 ` [PATCH v11 00/17] Implement NTB Controller using multiple PCI EP Lorenzo Pieralisi
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