Commit a1c473aa authored Oct 14, 2011 by Benjamin Herrenschmidt Committed by Jesse Barnes Oct 27, 2011

pci: Clamp pcie_set_readrq() when using "performance" settings



When configuring the PCIe settings for "performance", we allow parents
to have a larger Max Payload Size than children and rely on children
Max Read Request Size to not be larger than their own MPS to avoid
having the host bridge generate responses they can't cope with.

However, various drivers in Linux call pci_set_readrq() with arbitrary
values, assuming this to be a simple performance tweak. This breaks
under our "performance" configuration.

Fix that by making sure the value programmed by pcie_set_readrq() is
never larger than the configured MPS for that device.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Jon Mason <mason@myri.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

parent 62f392ea

drivers/pci/pci.c

+16 −2

Original line number	Diff line number	Diff line
		@@ -3202,8 +3202,6 @@ int pcie_set_readrq(struct pci_dev *dev, int rq)
		if (rq < 128 \|\| rq > 4096 \|\| !is_power_of_2(rq))
		goto out;

		v = (ffs(rq) - 8) << 12;

		cap = pci_pcie_cap(dev);
		if (!cap)
		goto out;
		@@ -3211,6 +3209,22 @@ int pcie_set_readrq(struct pci_dev *dev, int rq)
		err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
		if (err)
		goto out;
		/*
		* If using the "performance" PCIe config, we clamp the
		* read rq size to the max packet size to prevent the
		* host bridge generating requests larger than we can
		* cope with
		*/
		if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
		int mps = pcie_get_mps(dev);

		if (mps < 0)
		return mps;
		if (mps < rq)
		rq = mps;
		}

		v = (ffs(rq) - 8) << 12;

		if ((ctl & PCI_EXP_DEVCTL_READRQ) != v) {
		ctl &= ~PCI_EXP_DEVCTL_READRQ;

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