diff options
| -rw-r--r-- | drivers/vfio/fsl-mc/vfio_fsl_mc.c | 148 | ||||
| -rw-r--r-- | drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 1 |
2 files changed, 147 insertions, 2 deletions
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c index 7b0b7dc..a39b2a5 100644 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c @@ -17,10 +17,12 @@ #include <linux/slab.h> #include <linux/types.h> #include <linux/vfio.h> +#include <linux/delay.h> #include "../../staging/fsl-mc/include/mc.h" #include "../../staging/fsl-mc/include/mc-bus.h" #include "../../staging/fsl-mc/include/mc-sys.h" +#include "../../staging/fsl-mc/bus/dprc-cmd.h" #include "vfio_fsl_mc_private.h" @@ -62,6 +64,9 @@ static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev) vdev->regions[i].type |= VFIO_FSL_MC_REGION_TYPE_CACHEABLE; vdev->regions[i].flags = VFIO_REGION_INFO_FLAG_MMAP; + vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; + if (!(mc_dev->regions[i].flags & IORESOURCE_READONLY)) + vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE; } vdev->num_regions = mc_dev->obj_desc.region_count; @@ -70,6 +75,11 @@ static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev) static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev) { + int i; + + for (i = 0; i < vdev->num_regions; i++) + iounmap(vdev->regions[i].ioaddr); + vdev->num_regions = 0; kfree(vdev->regions); } @@ -272,13 +282,147 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd, static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf, size_t count, loff_t *ppos) { - return -EINVAL; + struct vfio_fsl_mc_device *vdev = device_data; + unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos); + loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK; + struct vfio_fsl_mc_region *region; + uint64_t data[8]; + int i; + + /* Read ioctl supported only for DPRC device */ + if (strcmp(vdev->mc_dev->obj_desc.type, "dprc")) + return -EINVAL; + + if (index >= vdev->num_regions) + return -EINVAL; + + region = &vdev->regions[index]; + + if (!(region->flags & VFIO_REGION_INFO_FLAG_READ)) + return -EINVAL; + + if (!region->type & VFIO_FSL_MC_REGION_TYPE_MMIO) + return -EINVAL; + + if (!region->ioaddr) { + region->ioaddr = ioremap_nocache(region->addr, region->size); + if (!region->ioaddr) + return -ENOMEM; + } + + if (count != 64 || off != 0) + return -EINVAL; + + for (i = 7; i >= 0; i--) + data[i] = readq(region->ioaddr + i * sizeof(uint64_t)); + + if (copy_to_user(buf, data, 64)) + return -EFAULT; + + return count; +} + +#define MC_CMD_COMPLETION_TIMEOUT_MS 5000 +#define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS 500 + +static int vfio_fsl_mc_dprc_wait_for_response(void __iomem *ioaddr) +{ + enum mc_cmd_status status; + unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000; + + for (;;) { + u64 header; + struct mc_cmd_header *resp_hdr; + + __iormb(); + header = readq(ioaddr); + __iormb(); + + resp_hdr = (struct mc_cmd_header *)&header; + status = (enum mc_cmd_status)resp_hdr->status; + if (status != MC_CMD_STATUS_READY) + break; + + udelay(MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS); + timeout_usecs -= MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS; + if (timeout_usecs == 0) + return -ETIMEDOUT; + } + + return 0; +} + +static int vfio_fsl_mc_send_command(void __iomem *ioaddr, uint64_t *cmd_data) +{ + int i; + + /* Write at command header in the end */ + for (i = 7; i >= 0; i--) + writeq(cmd_data[i], ioaddr + i * sizeof(uint64_t)); + + /* Wait for response before returning to user-space + * This can be optimized in future to even prepare response + * before returning to user-space and avoid read ioctl. + */ + return vfio_fsl_mc_dprc_wait_for_response(ioaddr); +} + +static int vfio_handle_dprc_commands(void __iomem *ioaddr, uint64_t *cmd_data) +{ + uint64_t cmd_hdr = cmd_data[0]; + int cmd = (cmd_hdr >> 52) & 0xfff; + + switch (cmd) { + case DPRC_CMDID_OPEN: + default: + return vfio_fsl_mc_send_command(ioaddr, cmd_data); + } + + return 0; } static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf, size_t count, loff_t *ppos) { - return -EINVAL; + struct vfio_fsl_mc_device *vdev = device_data; + unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos); + loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK; + struct vfio_fsl_mc_region *region; + uint64_t data[8]; + int ret; + + /* Write ioctl supported only for DPRC device */ + if (strcmp(vdev->mc_dev->obj_desc.type, "dprc")) + return -EINVAL; + + if (index >= vdev->num_regions) + return -EINVAL; + + region = &vdev->regions[index]; + + if (!(region->flags & VFIO_REGION_INFO_FLAG_WRITE)) + return -EINVAL; + + if (!region->type & VFIO_FSL_MC_REGION_TYPE_MMIO) + return -EINVAL; + + if (!region->ioaddr) { + region->ioaddr = ioremap_nocache(region->addr, region->size); + if (!region->ioaddr) + return -ENOMEM; + } + + if (count != 64 || off != 0) + return -EINVAL; + + if (copy_from_user(&data, buf, 64)) + return -EFAULT; + + ret = vfio_handle_dprc_commands(region->ioaddr, data); + if (ret) + return ret; + + return count; } static int vfio_fsl_mc_mmap_mmio(struct vfio_fsl_mc_region region, diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h index 46a0585..34e7575 100644 --- a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h @@ -35,6 +35,7 @@ struct vfio_fsl_mc_region { u32 type; u64 addr; resource_size_t size; + void __iomem *ioaddr; }; struct vfio_fsl_mc_device { |