vfio/fsl-mc: Add read/write support for fsl-mc devices
This patch adds support to read and write ioctls for fsl-mc devices. Only read-write to DPRC/DPMCP devices are supported while read writes on other fsl-mc devices is not supported by this patch. Also current patch limits userspace to write complete 64byte command once and read 64byte response by one ioctl. Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com> Signed-off-by: Diana Craciun <diana.craciun@nxp.com>5.4-rM2-2.2.x-imx-squashed
Diana Craciun
parent
d59f6fd5f4
commit
6f5a90ce35
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@ -12,6 +12,7 @@
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#include <linux/types.h>
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#include <linux/vfio.h>
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#include <linux/fsl/mc.h>
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#include <linux/delay.h>
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#include "vfio_fsl_mc_private.h"
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@ -112,6 +113,11 @@ static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev)
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}
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static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
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{
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int i;
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for (i = 0; i < vdev->num_regions; i++)
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iounmap(vdev->regions[i].ioaddr);
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vdev->num_regions = 0;
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kfree(vdev->regions);
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}
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@ -308,13 +314,128 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
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static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf,
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size_t count, loff_t *ppos)
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{
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return -EINVAL;
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struct vfio_fsl_mc_device *vdev = device_data;
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unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos);
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loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK;
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struct vfio_fsl_mc_region *region;
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uint64_t data[8];
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int i;
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/* Read ioctl supported only for DPRC and DPMCP device */
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if (strcmp(vdev->mc_dev->obj_desc.type, "dprc") &&
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strcmp(vdev->mc_dev->obj_desc.type, "dpmcp"))
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return -EINVAL;
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if (index >= vdev->num_regions)
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return -EINVAL;
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region = &vdev->regions[index];
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if (!(region->flags & VFIO_REGION_INFO_FLAG_READ))
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return -EINVAL;
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if (!region->ioaddr) {
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region->ioaddr = ioremap_nocache(region->addr, region->size);
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if (!region->ioaddr)
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return -ENOMEM;
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}
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if (count != 64 || off != 0)
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return -EINVAL;
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for (i = 7; i >= 0; i--)
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data[i] = readq(region->ioaddr + i * sizeof(uint64_t));
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if (copy_to_user(buf, data, 64))
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return -EFAULT;
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return count;
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}
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#define MC_CMD_COMPLETION_TIMEOUT_MS 5000
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#define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS 500
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static int vfio_fsl_mc_send_command(void __iomem *ioaddr, uint64_t *cmd_data)
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{
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int i;
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enum mc_cmd_status status;
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unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000;
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/* Write at command parameter into portal */
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for (i = 7; i >= 1; i--)
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writeq_relaxed(cmd_data[i], ioaddr + i * sizeof(uint64_t));
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/* Write command header in the end */
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writeq(cmd_data[0], ioaddr);
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/* Wait for response before returning to user-space
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* This can be optimized in future to even prepare response
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* before returning to user-space and avoid read ioctl.
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*/
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for (;;) {
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u64 header;
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struct mc_cmd_header *resp_hdr;
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header = cpu_to_le64(readq_relaxed(ioaddr));
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resp_hdr = (struct mc_cmd_header *)&header;
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status = (enum mc_cmd_status)resp_hdr->status;
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if (status != MC_CMD_STATUS_READY)
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break;
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udelay(MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS);
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timeout_usecs -= MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS;
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if (timeout_usecs == 0)
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return -ETIMEDOUT;
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}
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return 0;
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}
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static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return -EINVAL;
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struct vfio_fsl_mc_device *vdev = device_data;
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unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos);
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loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK;
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struct vfio_fsl_mc_region *region;
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uint64_t data[8];
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int ret;
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/* Write ioctl supported only for DPRC and DPMCP device */
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if (strcmp(vdev->mc_dev->obj_desc.type, "dprc") &&
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strcmp(vdev->mc_dev->obj_desc.type, "dpmcp"))
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return -EINVAL;
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if (index >= vdev->num_regions)
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return -EINVAL;
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region = &vdev->regions[index];
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if (!(region->flags & VFIO_REGION_INFO_FLAG_WRITE))
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return -EINVAL;
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if (!region->ioaddr) {
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region->ioaddr = ioremap_nocache(region->addr, region->size);
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if (!region->ioaddr)
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return -ENOMEM;
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}
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if (count != 64 || off != 0)
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return -EINVAL;
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if (copy_from_user(&data, buf, 64))
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return -EFAULT;
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ret = vfio_fsl_mc_send_command(region->ioaddr, data);
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if (ret)
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return ret;
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return count;
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}
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static int vfio_fsl_mc_mmap_mmio(struct vfio_fsl_mc_region region,
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@ -32,6 +32,7 @@ struct vfio_fsl_mc_region {
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u32 type;
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u64 addr;
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resource_size_t size;
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void __iomem *ioaddr;
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};
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struct vfio_fsl_mc_device {
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