[PATCH v3 12/30] s390/pci: get SHM information from list pci

Matthew Rosato
2022-02-04T21:16:39Z

KVM will need information on the special handle mask used to indicate
emulated devices. In order to obtain this, a new type of list pci call
must be made to gather the information. Extend clp_list_pci_req to
also fetch the model-dependent-data field that holds this mask.

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
arch/s390/include/asm/pci.h | 1 +
arch/s390/include/asm/pci_clp.h | 2 +-
arch/s390/pci/pci_clp.c | 25 ++++++++++++++++++++++---
3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 3c0b9986dcdc..e8a3fd5bc169 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -227,6 +227,7 @@ int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
int clp_get_state(u32 fid, enum zpci_state *state);
int clp_refresh_fh(u32 fid, u32 *fh);
+int zpci_get_mdd(u32 *mdd);

/* UID */
void update_uid_checking(bool new);
diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
index d6189ed14f84..dc2041e97de4 100644
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -76,7 +76,7 @@ struct clp_req_list_pci {
struct clp_rsp_list_pci {
struct clp_rsp_hdr hdr;
u64 resume_token;
- u32 reserved2;
+ u32 mdd;
u16 max_fn;
u8 : 7;
u8 uid_checking : 1;
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index dc733b58e74f..7477956be632 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -328,7 +328,7 @@ int clp_disable_fh(struct zpci_dev *zdev, u32 *fh)
}

static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
- u64 *resume_token, int *nentries)
+ u64 *resume_token, int *nentries, u32 *mdd)
{
int rc;

@@ -354,6 +354,8 @@ static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
*nentries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
rrb->response.entry_size;
*resume_token = rrb->response.resume_token;
+ if (mdd)
+ *mdd = rrb->response.mdd;

return rc;
}
@@ -365,7 +367,7 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
int nentries, i, rc;

do {
- rc = clp_list_pci_req(rrb, &resume_token, &nentries);
+ rc = clp_list_pci_req(rrb, &resume_token, &nentries, NULL);
if (rc)
return rc;
for (i = 0; i < nentries; i++)
@@ -383,7 +385,7 @@ static int clp_find_pci(struct clp_req_rsp_list_pci *rrb, u32 fid,
int nentries, i, rc;

do {
- rc = clp_list_pci_req(rrb, &resume_token, &nentries);
+ rc = clp_list_pci_req(rrb, &resume_token, &nentries, NULL);
if (rc)
return rc;
fh_list = rrb->response.fh_list;
@@ -468,6 +470,23 @@ int clp_get_state(u32 fid, enum zpci_state *state)
return rc;
}

+int zpci_get_mdd(u32 *mdd)
+{
+ struct clp_req_rsp_list_pci *rrb;
+ u64 resume_token = 0;
+ int nentries, rc;
+
+ rrb = clp_alloc_block(GFP_KERNEL);
+ if (!rrb)
+ return -ENOMEM;
+
+ rc = clp_list_pci_req(rrb, &resume_token, &nentries, mdd);
+
+ clp_free_block(rrb);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(zpci_get_mdd);
+
static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
{
unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
--
2.27.0