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hv: use MMIO read/write APIs to access MMIO registers

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MMIO registers might be changed at any time.
The changes might not be catched due to compiler optimization
if there is no 'volatile' keyword.

We have defined MMIO read/write APIs to address the above issue.
'volatile' keyword is being used in these defined MMIO read/write
APIs.

This patch updates the MMIO registers access implementation in
'msix.c' to use these defined MMIO read/write APIs.

v1 -> v2:
 * update the algorithm to get the address of high 32-bit of
   'pentry->addr'
   - previous way:
           &(pentry->addr) + 4U
           ===> &(pentry->addr) + 4 * 64 bits
           since 'pentry->addr' is 64 bits
   - new way:
           (char *)&(pentry->addr) + 4U
           ===> &(pentry->addr) + 4 * 8 bits
           since 'char' is 8 bits

Tracked-On: #1711
Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Shiqing Gao 2018-11-02 12:11:30 +08:00 committed by lijinxia
parent 313941e853
commit e8229879a6
1 changed files with 23 additions and 8 deletions
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31
hypervisor/dm/vpci/msix.c
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@ -48,7 +48,6 @@ static int vmsix_remap_entry(struct pci_vdev *vdev, uint32_t index, bool enable)
{
struct msix_table_entry *pentry;
struct ptdev_msi_info info;
volatile uint32_t *ptr32;
uint64_t hva;
int ret;
@ -70,11 +69,11 @@ static int vmsix_remap_entry(struct pci_vdev *vdev, uint32_t index, bool enable)
* fields with a single QWORD write, but some hardware can accept 32 bits
* write only
*/
ptr32 = (uint32_t *)&pentry->addr;
ptr32[0] = (uint32_t)info.pmsi_addr;
ptr32[1] = (info.pmsi_addr >> 32U);
pentry->data = info.pmsi_data;
pentry->vector_control = vdev->msix.tables[index].vector_control;
mmio_write32((uint32_t)(info.pmsi_addr), (const void *)&(pentry->addr));
mmio_write32((uint32_t)(info.pmsi_addr >> 32U), (const void *)((char *)&(pentry->addr) + 4U));
mmio_write32(info.pmsi_data, (const void *)&(pentry->data));
mmio_write32(vdev->msix.tables[index].vector_control, (const void *)&(pentry->vector_control));
return ret;
}
@ -254,11 +253,27 @@ static int vmsix_table_mmio_access_handler(struct io_request *io_req, void *hand
} else {
hva = vdev->msix.mmio_hva + offset;
/* Only DWORD and QWORD are permitted */
if ((mmio->size != 4U) && (mmio->size != 8U)) {
pr_err("%s, Only DWORD and QWORD are permitted", __func__);
return -EINVAL;
}
/* MSI-X PBA and Capability Table could be in the same range */
if (mmio->direction == REQUEST_READ) {
(void)memcpy_s(&mmio->value, (size_t)mmio->size, (const void *)hva, (size_t)mmio->size);
/* mmio->size is either 4U or 8U */
if (mmio->size == 4U) {
mmio->value = (uint64_t)mmio_read32((const void *)hva);
} else {
mmio->value = mmio_read64((const void *)hva);
}
} else {
(void)memcpy_s((void *)hva, (size_t)mmio->size, &mmio->value, (size_t)mmio->size);
/* mmio->size is either 4U or 8U */
if (mmio->size == 4U) {
mmio_write32((uint32_t)(mmio->value), (const void *)hva);
} else {
mmio_write64(mmio->value, (const void *)hva);
}
}
}