diff options
| author | Frederic Barrat <fbarrat@linux.vnet.ibm.com> | 2016-03-04 12:26:40 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-09 23:40:00 +1100 |
| commit | d601ea918b878582e60b773f2f943d8d292b2abf (patch) | |
| tree | d2bba34d1bc92b685d21c668c3abbde2c292a464 /drivers/misc/cxl/guest.c | |
| parent | b40844aa55bb325de7509003c7529c75b0532412 (diff) | |
cxl: Support the cxl kernel API from a guest
Like on bare-metal, the cxl driver creates a virtual PHB and a pci
device for the AFU. The configuration space of the device is mapped to
the configuration record of the AFU.
Reuse the code defined in afu_cr_read8|16|32() when reading the
configuration space of the AFU device.
Even though the (virtual) AFU device is a pci device, the adapter is
not. So a driver using the cxl kernel API cannot read the VPD of the
adapter through the usual PCI interface. Therefore, we add a call to
the cxl kernel API:
ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count);
Co-authored-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Manoj Kumar <manoj@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc/cxl/guest.c')
| -rw-r--r-- | drivers/misc/cxl/guest.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c index 816113d9d19b..2b07ebd2b429 100644 --- a/drivers/misc/cxl/guest.c +++ b/drivers/misc/cxl/guest.c @@ -418,6 +418,24 @@ static int guest_afu_cr_read64(struct cxl_afu *afu, int cr_idx, u64 offset, return _guest_afu_cr_readXX(8, afu, cr_idx, offset, out); } +static int guest_afu_cr_write32(struct cxl_afu *afu, int cr, u64 off, u32 in) +{ + /* config record is not writable from guest */ + return -EPERM; +} + +static int guest_afu_cr_write16(struct cxl_afu *afu, int cr, u64 off, u16 in) +{ + /* config record is not writable from guest */ + return -EPERM; +} + +static int guest_afu_cr_write8(struct cxl_afu *afu, int cr, u64 off, u8 in) +{ + /* config record is not writable from guest */ + return -EPERM; +} + static int attach_afu_directed(struct cxl_context *ctx, u64 wed, u64 amr) { struct cxl_process_element_hcall *elem; @@ -807,6 +825,9 @@ int cxl_guest_init_afu(struct cxl *adapter, int slice, struct device_node *afu_n afu->enabled = true; + if ((rc = cxl_pci_vphb_add(afu))) + dev_info(&afu->dev, "Can't register vPHB\n"); + return 0; err_put2: @@ -832,6 +853,7 @@ void cxl_guest_remove_afu(struct cxl_afu *afu) if (!afu) return; + cxl_pci_vphb_remove(afu); cxl_sysfs_afu_remove(afu); spin_lock(&afu->adapter->afu_list_lock); @@ -987,4 +1009,8 @@ const struct cxl_backend_ops cxl_guest_ops = { .afu_cr_read16 = guest_afu_cr_read16, .afu_cr_read32 = guest_afu_cr_read32, .afu_cr_read64 = guest_afu_cr_read64, + .afu_cr_write8 = guest_afu_cr_write8, + .afu_cr_write16 = guest_afu_cr_write16, + .afu_cr_write32 = guest_afu_cr_write32, + .read_adapter_vpd = cxl_guest_read_adapter_vpd, }; |