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Commit e0ca3826 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'vfio-v4.15-rc1' of git://github.com/awilliam/linux-vfio 

Pull VFIO updates from Alex Williamson:

 - Virtualize PCI MPS and MRRS registers

 - Avoid soft lockups on SPAPR when clearing TCE

 - Broadcom FlexRM platform device support

 - Samples driver cleanup & type1 integer overflow fix

* tag 'vfio-v4.15-rc1' of git://github.com/awilliam/linux-vfio:
  vfio: platform: reset: Add Broadcom FlexRM reset module
  vfio/type1: silence integer overflow warning
  vfio-mdev/samples: make mdev_fops const and static
  vfio/spapr: Add cond_resched() for huge updates
  vfio/pci: Virtualize Maximum Read Request Size
  vfio/pci: Virtualize Maximum Payload Size
parents 2cd83ba5 f3199673

drivers/vfio/pci/vfio_pci_config.c

+28 −3
Original line number Diff line number Diff line
@@ -808,6 +808,7 @@ static int vfio_exp_config_write(struct vfio_pci_device *vdev, int pos, 
{

	__le16 *ctrl = (__le16 *)(vdev->vconfig + pos -

				  offset + PCI_EXP_DEVCTL);

	int readrq = le16_to_cpu(*ctrl) & PCI_EXP_DEVCTL_READRQ;



	count = vfio_default_config_write(vdev, pos, count, perm, offset, val);

	if (count < 0)
@@ -833,6 +834,27 @@ static int vfio_exp_config_write(struct vfio_pci_device *vdev, int pos, 
			pci_try_reset_function(vdev->pdev);

	}



	/*

	 * MPS is virtualized to the user, writes do not change the physical

	 * register since determining a proper MPS value requires a system wide

	 * device view.  The MRRS is largely independent of MPS, but since the

	 * user does not have that system-wide view, they might set a safe, but

	 * inefficiently low value.  Here we allow writes through to hardware,

	 * but we set the floor to the physical device MPS setting, so that

	 * we can at least use full TLPs, as defined by the MPS value.

	 *

	 * NB, if any devices actually depend on an artificially low MRRS

	 * setting, this will need to be revisited, perhaps with a quirk

	 * though pcie_set_readrq().

	 */

	if (readrq != (le16_to_cpu(*ctrl) & PCI_EXP_DEVCTL_READRQ)) {

		readrq = 128 <<

			((le16_to_cpu(*ctrl) & PCI_EXP_DEVCTL_READRQ) >> 12);

		readrq = max(readrq, pcie_get_mps(vdev->pdev));



		pcie_set_readrq(vdev->pdev, readrq);

	}



	return count;

}
@@ -849,11 +871,14 @@ static int __init init_pci_cap_exp_perm(struct perm_bits *perm) 


	/*

	 * Allow writes to device control fields, except devctl_phantom,

	 * which could confuse IOMMU, and the ARI bit in devctl2, which

	 * is set at probe time.  FLR gets virtualized via our writefn.

	 * which could confuse IOMMU, MPS, which can break communication

	 * with other physical devices, and the ARI bit in devctl2, which

	 * is set at probe time.  FLR and MRRS get virtualized via our

	 * writefn.

	 */

	p_setw(perm, PCI_EXP_DEVCTL,

	       PCI_EXP_DEVCTL_BCR_FLR, ~PCI_EXP_DEVCTL_PHANTOM);

	       PCI_EXP_DEVCTL_BCR_FLR | PCI_EXP_DEVCTL_PAYLOAD |

	       PCI_EXP_DEVCTL_READRQ, ~PCI_EXP_DEVCTL_PHANTOM);

	p_setw(perm, PCI_EXP_DEVCTL2, NO_VIRT, ~PCI_EXP_DEVCTL2_ARI);

	return 0;

}

drivers/vfio/platform/reset/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -13,3 +13,12 @@ config VFIO_PLATFORM_AMDXGBE_RESET 
	  Enables the VFIO platform driver to handle reset for AMD XGBE



	  If you don't know what to do here, say N.



config VFIO_PLATFORM_BCMFLEXRM_RESET

	tristate "VFIO support for Broadcom FlexRM reset"

	depends on VFIO_PLATFORM && (ARCH_BCM_IPROC || COMPILE_TEST)

	default ARCH_BCM_IPROC

	help

	  Enables the VFIO platform driver to handle reset for Broadcom FlexRM



	  If you don't know what to do here, say N.

drivers/vfio/platform/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -6,3 +6,4 @@ ccflags-y += -Idrivers/vfio/platform 


obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o

obj-$(CONFIG_VFIO_PLATFORM_AMDXGBE_RESET) += vfio-platform-amdxgbe.o

obj-$(CONFIG_VFIO_PLATFORM_BCMFLEXRM_RESET) += vfio_platform_bcmflexrm.o

drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c

0 → 100644
+113 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 Broadcom

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



/*

 * This driver provides reset support for Broadcom FlexRM ring manager

 * to VFIO platform.

 */



#include <linux/delay.h>

#include <linux/device.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>



#include "vfio_platform_private.h"



/* FlexRM configuration */

#define RING_REGS_SIZE					0x10000

#define RING_VER_MAGIC					0x76303031



/* Per-Ring register offsets */

#define RING_VER					0x000

#define RING_CONTROL					0x034

#define RING_FLUSH_DONE					0x038



/* Register RING_CONTROL fields */

#define CONTROL_FLUSH_SHIFT				5



/* Register RING_FLUSH_DONE fields */

#define FLUSH_DONE_MASK					0x1



static int vfio_platform_bcmflexrm_shutdown(void __iomem *ring)

{

	unsigned int timeout;



	/* Disable/inactivate ring */

	writel_relaxed(0x0, ring + RING_CONTROL);



	/* Set ring flush state */

	timeout = 1000; /* timeout of 1s */

	writel_relaxed(BIT(CONTROL_FLUSH_SHIFT), ring + RING_CONTROL);

	do {

		if (readl_relaxed(ring + RING_FLUSH_DONE) &

		    FLUSH_DONE_MASK)

			break;

		mdelay(1);

	} while (--timeout);

	if (!timeout)

		return -ETIMEDOUT;



	/* Clear ring flush state */

	timeout = 1000; /* timeout of 1s */

	writel_relaxed(0x0, ring + RING_CONTROL);

	do {

		if (!(readl_relaxed(ring + RING_FLUSH_DONE) &

		      FLUSH_DONE_MASK))

			break;

		mdelay(1);

	} while (--timeout);

	if (!timeout)

		return -ETIMEDOUT;



	return 0;

}



static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev)

{

	void __iomem *ring;

	int rc = 0, ret = 0, ring_num = 0;

	struct vfio_platform_region *reg = &vdev->regions[0];



	/* Map FlexRM ring registers if not mapped */

	if (!reg->ioaddr) {

		reg->ioaddr = ioremap_nocache(reg->addr, reg->size);

		if (!reg->ioaddr)

			return -ENOMEM;

	}



	/* Discover and shutdown each FlexRM ring */

	for (ring = reg->ioaddr;

	     ring < (reg->ioaddr + reg->size); ring += RING_REGS_SIZE) {

		if (readl_relaxed(ring + RING_VER) == RING_VER_MAGIC) {

			rc = vfio_platform_bcmflexrm_shutdown(ring);

			if (rc) {

				dev_warn(vdev->device,

					 "FlexRM ring%d shutdown error %d\n",

					 ring_num, rc);

				ret |= rc;

			}

			ring_num++;

		}

	}



	return ret;

}



module_vfio_reset_handler("brcm,iproc-flexrm-mbox",

			  vfio_platform_bcmflexrm_reset);



MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>");

MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device");

drivers/vfio/vfio_iommu_spapr_tce.c

+2 −0
Original line number Diff line number Diff line
@@ -507,6 +507,8 @@ static int tce_iommu_clear(struct tce_container *container, 
	enum dma_data_direction direction;



	for ( ; pages; --pages, ++entry) {

		cond_resched();



		direction = DMA_NONE;

		oldhpa = 0;

		ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);