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The driver walks the MSI descriptors to test whether a descriptor exists
for a given index. That's just abuse of the MSI internals.
The same test can be done with a single function call by looking up whether
there is a Linux interrupt number assigned at the index.
What's worse is that the function is completely unserialized against
modifications of the MSI-X control by operations issued from the interrupt
core. It also brings the PCI/MSI-X internal cached control word out of
sync.
Remove the trainwreck and invoke the function provided by the PCI/MSI core
to update it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/all/20250319105506.744271447@linutronix.de
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip"
This reverts commit 36f5f026df6c1cd8a20373adc4388d2b3401ce91, reversing
changes made to 43a7eec035a5b64546c8adefdc9cf96a116da14b.
Thomas says:
"I just noticed that for some incomprehensible reason, probably sheer
incompetemce when trying to utilize b4, I managed to merge an outdated
_and_ buggy version of that series.
Can you please revert that merge completely?"
Done.
Requested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The driver walks the MSI descriptors to test whether a descriptor exists
for a given index. That's just abuse of the MSI internals.
The same test can be done with a single function call by looking up whether
there is a Linux interrupt number assigned at the index.
What's worse is that the function is completely unserialized against
modifications of the MSI-X control by operations issued from the interrupt
core. It also brings the PCI/MSI-X internal cached control word out of
sync.
Remove the trainwreck and invoke the function provided by the PCI/MSI core
to update it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/all/20250313130321.898592817@linutronix.de
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When we reenable TPH after changing a Steering Tag value, we need the
actual TPH Requester Enable value, not the ST Mode (which only happens to
work out by chance for non-extended TPH in interrupt vector mode).
Link: https://lore.kernel.org/r/13118098116d7bce07aa20b8c52e28c7d1847246.1738759933.git.robin.murphy@arm.com
Fixes: d2e8a34876ce ("PCI/TPH: Add Steering Tag support")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Wei Huang <wei.huang2@amd.com>
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Add pcie_tph_get_cpu_st() to allow a caller to retrieve Steering Tags for a
target memory associated with a specific CPU. The ST tag is retrieved by
invoking PCI ACPI "_DSM to Query Cache Locality TPH Features" method
(rev=0x7, func=0xF) of the device's Root Port device.
Add pcie_tph_set_st_entry() to update the device's Steering Tags. The tags
will be written into the device's MSI-X table or the ST table located in
the TPH Extended Capability space.
Co-developed-by: Eric Van Tassell <Eric.VanTassell@amd.com>
Link: https://lore.kernel.org/r/20241002165954.128085-3-wei.huang2@amd.com
Signed-off-by: Eric Van Tassell <Eric.VanTassell@amd.com>
Signed-off-by: Wei Huang <wei.huang2@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
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Add support for PCIe TLP Processing Hints (TPH) support (see PCIe r6.2,
sec 6.17).
Add TPH register definitions in pci_regs.h, including the TPH Requester
capability register, TPH Requester control register, TPH Completer
capability, and the ST fields of MSI-X entry.
Introduce pcie_enable_tph() and pcie_disable_tph(), enabling drivers to
toggle TPH support and configure specific ST mode as needed. Also add a new
kernel parameter, "pci=notph", allowing users to disable TPH support across
the entire system.
Link: https://lore.kernel.org/r/20241002165954.128085-2-wei.huang2@amd.com
Co-developed-by: Jing Liu <jing2.liu@intel.com>
Co-developed-by: Paul Luse <paul.e.luse@linux.intel.com>
Co-developed-by: Eric Van Tassell <Eric.VanTassell@amd.com>
Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Eric Van Tassell <Eric.VanTassell@amd.com>
Signed-off-by: Wei Huang <wei.huang2@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
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