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https://github.com/AsahiLinux/u-boot
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59b1c9be01
Enable tuning of the PCI Express MPS (Maximum Payload Size) of each device. The Maximum Read Request Size is not altered. The SAFE method uses the largest MPS value supported by all devices in the system for each device. This method is the same algorithm as used by Linux pci=pcie_bus_safe. The PEER2PEER method sets all devices to the minimal (128 byte) MPS, which allows hot plug of devices later that might only support the minimum size, and ensures compatibility of DMA between two devices on the bus. Signed-off-by: Stephen Carlson <stcarlso@linux.microsoft.com>
164 lines
3.5 KiB
C
164 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2022 Microsoft Corporation <www.microsoft.com>
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* Stephen Carlson <stcarlso@linux.microsoft.com>
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*
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* PCI Express Maximum Packet Size (MPS) configuration
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*/
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#include <common.h>
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#include <bootretry.h>
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#include <cli.h>
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#include <command.h>
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#include <console.h>
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#include <dm.h>
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#include <init.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <pci.h>
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#define PCI_MPS_SAFE 0
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#define PCI_MPS_PEER2PEER 1
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static int pci_mps_find_safe(struct udevice *bus, unsigned int *min_mps,
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unsigned int *n)
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{
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struct udevice *dev;
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int res = 0, addr;
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unsigned int mpss;
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u32 regval;
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if (!min_mps || !n)
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return -EINVAL;
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for (device_find_first_child(bus, &dev);
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dev;
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device_find_next_child(&dev)) {
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addr = dm_pci_find_capability(dev, PCI_CAP_ID_EXP);
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if (addr <= 0)
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continue;
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res = dm_pci_read_config32(dev, addr + PCI_EXP_DEVCAP,
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®val);
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if (res != 0)
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return res;
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mpss = (unsigned int)(regval & PCI_EXP_DEVCAP_PAYLOAD);
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*n += 1;
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if (mpss < *min_mps)
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*min_mps = mpss;
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}
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return res;
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}
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static int pci_mps_set_bus(struct udevice *bus, unsigned int target)
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{
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struct udevice *dev;
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u32 mpss, target_mps = (u32)(target << 5);
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u16 mps;
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int res = 0, addr;
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for (device_find_first_child(bus, &dev);
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dev && res == 0;
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device_find_next_child(&dev)) {
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addr = dm_pci_find_capability(dev, PCI_CAP_ID_EXP);
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if (addr <= 0)
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continue;
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res = dm_pci_read_config32(dev, addr + PCI_EXP_DEVCAP,
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&mpss);
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if (res != 0)
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return res;
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/* Do not set device above its maximum MPSS */
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mpss = (mpss & PCI_EXP_DEVCAP_PAYLOAD) << 5;
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if (target_mps < mpss)
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mps = (u16)target_mps;
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else
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mps = (u16)mpss;
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res = dm_pci_clrset_config16(dev, addr + PCI_EXP_DEVCTL,
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PCI_EXP_DEVCTL_PAYLOAD, mps);
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}
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return res;
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}
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/*
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* Sets the MPS of each PCI Express device to the specified policy.
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*/
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static int pci_mps_set(int policy)
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{
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struct udevice *bus;
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int i, res = 0;
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/* 0 = 128B, min value for hotplug */
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unsigned int mps = 0;
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if (policy == PCI_MPS_SAFE) {
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unsigned int min_mps = PCI_EXP_DEVCAP_PAYLOAD_4096B, n = 0;
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/* Find maximum MPS supported by all devices */
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for (i = 0;
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uclass_get_device_by_seq(UCLASS_PCI, i, &bus) == 0 &&
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res == 0;
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i++)
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res = pci_mps_find_safe(bus, &min_mps, &n);
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/* If no devices were found, do not reconfigure */
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if (n == 0)
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return res;
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mps = min_mps;
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}
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/* This message is checked by the sandbox test */
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printf("Setting MPS of all devices to %uB\n", 128U << mps);
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for (i = 0;
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uclass_get_device_by_seq(UCLASS_PCI, i, &bus) == 0 && res == 0;
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i++)
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res = pci_mps_set_bus(bus, mps);
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return res;
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}
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/*
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* PCI MPS tuning commands
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*
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* Syntax:
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* pci_mps safe
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* pci_mps peer2peer
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*/
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static int do_pci_mps(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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char cmd = 'u';
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int ret = 0;
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if (argc > 1)
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cmd = argv[1][0];
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switch (cmd) {
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case 's': /* safe */
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ret = pci_mps_set(PCI_MPS_SAFE);
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break;
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case 'p': /* peer2peer/hotplug */
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ret = pci_mps_set(PCI_MPS_PEER2PEER);
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break;
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default: /* usage, help */
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goto usage;
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}
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return ret;
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usage:
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return CMD_RET_USAGE;
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}
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/***************************************************/
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#ifdef CONFIG_SYS_LONGHELP
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static char pci_mps_help_text[] =
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"safe\n"
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" - Set PCI Express MPS of all devices to safe values\n"
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"pci_mps peer2peer\n"
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" - Set PCI Express MPS of all devices to support hotplug and peer-to-peer DMA\n";
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#endif
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U_BOOT_CMD(pci_mps, 2, 0, do_pci_mps,
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"configure PCI Express MPS", pci_mps_help_text);
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