On Wed, Nov 23, 2016 at 06:57:31PM +0800, Peter Xu wrote: > QEMU edu device is a pci device that is originally written for > educational purpose, however it also suits for IOMMU unit test. Adding > helpers for this specific device to implement the device logic. > > The device supports lots of functions, here only DMA operation is > supported. > > The spec of the device can be found at: > > https://github.com/qemu/qemu/blob/master/docs/specs/edu.txt > > Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx> > Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> > --- > lib/pci-edu.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > lib/pci-edu.h | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 155 insertions(+) > create mode 100644 lib/pci-edu.c > create mode 100644 lib/pci-edu.h > > diff --git a/lib/pci-edu.c b/lib/pci-edu.c > new file mode 100644 > index 0000000..c9a8b0c > --- /dev/null > +++ b/lib/pci-edu.c > @@ -0,0 +1,73 @@ > +/* > + * Edu PCI device. > + * > + * Copyright (C) 2016 Red Hat, Inc. > + * > + * Authors: > + * Peter Xu <peterx@xxxxxxxxxx>, > + * > + * This work is licensed under the terms of the GNU LGPL, version 2 or > + * later. > + */ > + > +#include "pci-edu.h" > +#include "asm/barrier.h" > + > +/* Return true if alive */ > +static inline bool edu_check_alive(struct pci_edu_dev *dev) > +{ > + static uint32_t live_count = 1; > + uint32_t value; > + > + edu_reg_writel(dev, EDU_REG_ALIVE, live_count++); > + value = edu_reg_readl(dev, EDU_REG_ALIVE); > + return (live_count - 1 == ~value); > +} > + > +bool edu_init(struct pci_edu_dev *dev) > +{ > + pcidevaddr_t dev_addr; > + > + dev_addr = pci_find_dev(PCI_VENDOR_ID_QEMU, PCI_DEVICE_ID_EDU); > + if (dev_addr == PCIDEVADDR_INVALID) > + return false; > + > + pci_dev_init(&dev->pci_dev, dev_addr); > + pci_enable_defaults(&dev->pci_dev); > + assert(edu_check_alive(dev)); > + return true; > +} > + > +void edu_dma(struct pci_edu_dev *dev, iova_t iova, > + size_t size, int dev_offset, bool from_device) > +{ > + uint64_t from, to; > + uint32_t cmd = EDU_CMD_DMA_START; > + > + assert(size <= EDU_DMA_SIZE_MAX); > + assert(dev_offset < EDU_DMA_SIZE_MAX && > + dev_offset >= 0); > + > + printf("edu device DMA start %s addr %p size 0x%lu off 0x%x\n", > + from_device ? "FROM" : "TO", > + (void *)iova, size, dev_offset); > + > + if (from_device) { > + from = dev_offset + EDU_DMA_START; > + to = iova; > + cmd |= EDU_CMD_DMA_FROM; > + } else { > + from = iova; > + to = EDU_DMA_START + dev_offset; > + cmd |= EDU_CMD_DMA_TO; > + } > + > + edu_reg_writeq(dev, EDU_REG_DMA_SRC, from); > + edu_reg_writeq(dev, EDU_REG_DMA_DST, to); > + edu_reg_writeq(dev, EDU_REG_DMA_COUNT, size); > + edu_reg_writel(dev, EDU_REG_DMA_CMD, cmd); > + > + /* Wait until DMA finished */ > + while (edu_reg_readl(dev, EDU_REG_DMA_CMD) & EDU_CMD_DMA_START) > + cpu_relax(); > +} > diff --git a/lib/pci-edu.h b/lib/pci-edu.h > new file mode 100644 > index 0000000..5d896c9 > --- /dev/null > +++ b/lib/pci-edu.h > @@ -0,0 +1,82 @@ > +/* > + * Edu PCI device header. > + * > + * Copyright (C) 2016 Red Hat, Inc. > + * > + * Authors: > + * Peter Xu <peterx@xxxxxxxxxx>, > + * > + * This work is licensed under the terms of the GNU LGPL, version 2 or > + * later. > + * > + * Edu device is a virtualized device in QEMU. Please refer to > + * docs/specs/edu.txt in QEMU repository for EDU device manual. > + */ > +#ifndef __PCI_EDU_H__ > +#define __PCI_EDU_H__ > + > +#include "pci.h" > +#include "asm/io.h" > + > +#define PCI_VENDOR_ID_QEMU 0x1234 > +#define PCI_DEVICE_ID_EDU 0x11e8 > + > +/* The only bar used by EDU device */ > +#define EDU_BAR 0 > +#define EDU_MAGIC 0xed > +#define EDU_VERSION 0x100 > +#define EDU_DMA_BUF_SIZE (1 << 20) > +#define EDU_INPUT_BUF_SIZE 256 > + > +#define EDU_REG_ID 0x0 > +#define EDU_REG_ALIVE 0x4 > +#define EDU_REG_FACTORIAL 0x8 > +#define EDU_REG_STATUS 0x20 > +#define EDU_REG_DMA_SRC 0x80 > +#define EDU_REG_DMA_DST 0x88 > +#define EDU_REG_DMA_COUNT 0x90 > +#define EDU_REG_DMA_CMD 0x98 > + > +#define EDU_CMD_DMA_START 0x01 > +#define EDU_CMD_DMA_FROM 0x02 > +#define EDU_CMD_DMA_TO 0x00 > + > +#define EDU_STATUS_FACTORIAL 0x1 > +#define EDU_STATUS_INT_ENABLE 0x80 > + > +#define EDU_DMA_START 0x40000 > +#define EDU_DMA_SIZE_MAX 4096 > + > +struct pci_edu_dev { > + struct pci_dev pci_dev; > +}; > + > +#define edu_reg(d, r) (volatile void *)((d)->pci_dev.resource[EDU_BAR] + (r)) > + > +static inline uint64_t edu_reg_readq(struct pci_edu_dev *dev, int reg) > +{ > + return __raw_readq(edu_reg(dev, reg)); > +} > + > +static inline uint32_t edu_reg_readl(struct pci_edu_dev *dev, int reg) > +{ > + return __raw_readl(edu_reg(dev, reg)); > +} > + > +static inline void edu_reg_writeq(struct pci_edu_dev *dev, int reg, > + uint64_t val) > +{ > + __raw_writeq(val, edu_reg(dev, reg)); > +} > + > +static inline void edu_reg_writel(struct pci_edu_dev *dev, int reg, > + uint32_t val) > +{ > + __raw_writel(val, edu_reg(dev, reg)); > +} Can you refresh my memory on why we're using __raw accessors here instead of the __raw wrappers that include barriers and endian conversion? Hmm, actually it doesn't look like the EDU device specifies an endianness... > + > +bool edu_init(struct pci_edu_dev *dev); > +void edu_dma(struct pci_edu_dev *dev, iova_t iova, > + size_t size, int dev_offset, bool from_device); > + > +#endif > -- > 2.7.4 > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
