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Message-Id: <20241116-ep-msi-v8-0-6f1f68ffd1bb@nxp.com>
Date: Sat, 16 Nov 2024 09:40:40 -0500
From: Frank Li <Frank.Li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
imx@...ts.linux.dev, Niklas Cassel <cassel@...nel.org>, dlemoal@...nel.org,
maz@...nel.org, tglx@...utronix.de, jdmason@...zu.us,
Frank Li <Frank.Li@....com>
Subject: [PATCH v8 0/6] PCI: EP: Add RC-to-EP doorbell with platform MSI
controller
┌────────────┐ ┌───────────────────────────────────┐ ┌────────────────┐
│ │ │ │ │ │
│ │ │ PCI Endpoint │ │ PCI Host │
│ │ │ │ │ │
│ │◄──┤ 1.platform_msi_domain_alloc_irqs()│ │ │
│ │ │ │ │ │
│ MSI ├──►│ 2.write_msi_msg() ├──►├─BAR<n> │
│ Controller │ │ update doorbell register address│ │ │
│ │ │ for BAR │ │ │
│ │ │ │ │ 3. Write BAR<n>│
│ │◄──┼───────────────────────────────────┼───┤ │
│ │ │ │ │ │
│ ├──►│ 4.Irq Handle │ │ │
│ │ │ │ │ │
│ │ │ │ │ │
└────────────┘ └───────────────────────────────────┘ └────────────────┘
This patches based on old https://lore.kernel.org/imx/20221124055036.1630573-1-Frank.Li@nxp.com/
Original patch only target to vntb driver. But actually it is common
method.
This patches add new API to pci-epf-core, so any EP driver can use it.
Previous v2 discussion here.
https://lore.kernel.org/imx/20230911220920.1817033-1-Frank.Li@nxp.com/
Changes in v8:
- update helper function name to pci_epf_align_inbound_addr()
- Link to v7: https://lore.kernel.org/r/20241114-ep-msi-v7-0-d4ac7aafbd2c@nxp.com
Changes in v7:
- Add helper function pci_epf_align_addr();
- Link to v6: https://lore.kernel.org/r/20241112-ep-msi-v6-0-45f9722e3c2a@nxp.com
Changes in v6:
- change doorbell_addr to doorbell_offset
- use round_down()
- add Niklas's test by tag
- rebase to pci/endpoint
- Link to v5: https://lore.kernel.org/r/20241108-ep-msi-v5-0-a14951c0d007@nxp.com
Changes in v5:
- Move request_irq to epf test function driver for more flexiable user case
- Add fixed size bar handler
- Some minor improvememtn to see each patches's changelog.
- Link to v4: https://lore.kernel.org/r/20241031-ep-msi-v4-0-717da2d99b28@nxp.com
Changes in v4:
- Remove patch genirq/msi: Add cleanup guard define for msi_lock_descs()/msi_unlock_descs()
- Use new method to avoid compatible problem.
Add new command DOORBELL_ENABLE and DOORBELL_DISABLE.
pcitest -B send DOORBELL_ENABLE first, EP test function driver try to
remap one of BAR_N (except test register bar) to ITS MSI MMIO space. Old
driver don't support new command, so failure return, not side effect.
After test, DOORBELL_DISABLE command send out to recover original map, so
pcitest bar test can pass as normal.
- Other detail change see each patches's change log
- Link to v3: https://lore.kernel.org/r/20241015-ep-msi-v3-0-cedc89a16c1a@nxp.com
Change from v2 to v3
- Fixed manivannan's comments
- Move common part to pci-ep-msi.c and pci-ep-msi.h
- rebase to 6.12-rc1
- use RevID to distingiush old version
mkdir /sys/kernel/config/pci_ep/functions/pci_epf_test/func1
echo 16 > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/msi_interrupts
echo 0x080c > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/deviceid
echo 0x1957 > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/vendorid
echo 1 > /sys/kernel/config/pci_ep/functions/pci_epf_test/func1/revid
^^^^^^ to enable platform msi support.
ln -s /sys/kernel/config/pci_ep/functions/pci_epf_test/func1 /sys/kernel/config/pci_ep/controllers/4c380000.pcie-ep
- use new device ID, which identify support doorbell to avoid broken
compatility.
Enable doorbell support only for PCI_DEVICE_ID_IMX8_DB, while other devices
keep the same behavior as before.
EP side RC with old driver RC with new driver
PCI_DEVICE_ID_IMX8_DB no probe doorbell enabled
Other device ID doorbell disabled* doorbell disabled*
* Behavior remains unchanged.
Change from v1 to v2
- Add missed patch for endpont/pci-epf-test.c
- Move alloc and free to epc driver from epf.
- Provide general help function for EPC driver to alloc platform msi irq.
- Fixed manivannan's comments.
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Krzysztof Wilczyński <kw@...ux.com>
To: Kishon Vijay Abraham I <kishon@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>
To: Arnd Bergmann <arnd@...db.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org
Cc: linux-pci@...r.kernel.org
Cc: imx@...ts.linux.dev
Cc: Niklas Cassel <cassel@...nel.org>
Cc: cassel@...nel.org
Cc: dlemoal@...nel.org
Cc: maz@...nel.org
Cc: tglx@...utronix.de
Cc: jdmason@...zu.us
Signed-off-by: Frank Li <Frank.Li@....com>
---
Frank Li (6):
PCI: endpoint: Add pci_epc_get_fn() API for customizable filtering
PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller
PCI: endpoint: Add pci_epf_align_addr() helper for address alignment
PCI: endpoint: pci-epf-test: Add doorbell test support
misc: pci_endpoint_test: Add doorbell test case
tools: PCI: Add 'B' option for test doorbell
drivers/misc/pci_endpoint_test.c | 71 ++++++++++++++++
drivers/pci/endpoint/Makefile | 2 +-
drivers/pci/endpoint/functions/pci-epf-test.c | 117 ++++++++++++++++++++++++++
drivers/pci/endpoint/pci-ep-msi.c | 99 ++++++++++++++++++++++
drivers/pci/endpoint/pci-epc-core.c | 23 ++++-
drivers/pci/endpoint/pci-epf-core.c | 45 ++++++++++
include/linux/pci-ep-msi.h | 15 ++++
include/linux/pci-epc.h | 2 +
include/linux/pci-epf.h | 30 +++++++
include/uapi/linux/pcitest.h | 1 +
tools/pci/pcitest.c | 16 +++-
11 files changed, 417 insertions(+), 4 deletions(-)
---
base-commit: f5373677e13177cfc7875f44a864f9a1db751df9
change-id: 20241010-ep-msi-8b4cab33b1be
Best regards,
---
Frank Li <Frank.Li@....com>
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