[RESENT PATCH v13 6/6] PCI: endpoint: pci-epf-vntb: fix sparse build warning

From: Frank Li
Date: Wed Oct 19 2022 - 12:40:54 EST


From: Frank Li <frank.li@xxxxxxx>

Using epf_db[i] instead of readl() because epf_db is located in local
memory and allocated by dma_alloc_coherent().

Sparse build warning when there are not __iomem at readl().
Added __iomem force type convert in vntb_epf_peer_spad_read\write()
and vntb_epf_spad_read\write(). This require strong order at read and
write.

Signed-off-by: Frank Li <frank.li@xxxxxxx>
---
drivers/pci/endpoint/functions/pci-epf-vntb.c | 27 +++++++++----------
1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 54616281da9e..9f1ec6788e51 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -136,7 +136,7 @@ struct epf_ntb {

struct epf_ntb_ctrl *reg;

- void __iomem *epf_db;
+ u32 *epf_db;

phys_addr_t vpci_mw_phy[MAX_MW];
void __iomem *vpci_mw_addr[MAX_MW];
@@ -257,12 +257,9 @@ static void epf_ntb_cmd_handler(struct work_struct *work)
ntb = container_of(work, struct epf_ntb, cmd_handler.work);

for (i = 1; i < ntb->db_count; i++) {
- if (readl(ntb->epf_db + i * sizeof(u32))) {
- if (readl(ntb->epf_db + i * sizeof(u32)))
- ntb->db |= 1 << (i - 1);
-
+ if (ntb->epf_db[i]) {
ntb_db_event(&ntb->ntb, i);
- writel(0, ntb->epf_db + i * sizeof(u32));
+ ntb->epf_db[i] = 0;
}
}

@@ -529,13 +526,15 @@ static int epf_ntb_configure_interrupt(struct epf_ntb *ntb)
static int epf_ntb_db_bar_init(struct epf_ntb *ntb)
{
const struct pci_epc_features *epc_features;
- u32 align;
struct device *dev = &ntb->epf->dev;
- int ret;
struct pci_epf_bar *epf_bar;
- void __iomem *mw_addr;
enum pci_barno barno;
- size_t size = sizeof(u32) * ntb->db_count;
+ void *mw_addr;
+ size_t size;
+ u32 align;
+ int ret;
+
+ size = sizeof(u32) * ntb->db_count;

epc_features = pci_epc_get_features(ntb->epf->epc,
ntb->epf->func_no,
@@ -1123,7 +1122,7 @@ static u32 vntb_epf_spad_read(struct ntb_dev *ndev, int idx)
struct epf_ntb *ntb = ntb_ndev(ndev);
int off = ntb->reg->spad_offset, ct = ntb->reg->spad_count * sizeof(u32);
u32 val;
- void __iomem *base = ntb->reg;
+ void __iomem *base = (void __iomem *)ntb->reg;

val = readl(base + off + ct + idx * sizeof(u32));
return val;
@@ -1134,7 +1133,7 @@ static int vntb_epf_spad_write(struct ntb_dev *ndev, int idx, u32 val)
struct epf_ntb *ntb = ntb_ndev(ndev);
struct epf_ntb_ctrl *ctrl = ntb->reg;
int off = ctrl->spad_offset, ct = ctrl->spad_count * sizeof(u32);
- void __iomem *base = ntb->reg;
+ void __iomem *base = (void __iomem *)ntb->reg;

writel(val, base + off + ct + idx * sizeof(u32));
return 0;
@@ -1145,7 +1144,7 @@ static u32 vntb_epf_peer_spad_read(struct ntb_dev *ndev, int pidx, int idx)
struct epf_ntb *ntb = ntb_ndev(ndev);
struct epf_ntb_ctrl *ctrl = ntb->reg;
int off = ctrl->spad_offset;
- void __iomem *base = ntb->reg;
+ void __iomem *base = (void __iomem *)ntb->reg;
u32 val;

val = readl(base + off + idx * sizeof(u32));
@@ -1157,7 +1156,7 @@ static int vntb_epf_peer_spad_write(struct ntb_dev *ndev, int pidx, int idx, u32
struct epf_ntb *ntb = ntb_ndev(ndev);
struct epf_ntb_ctrl *ctrl = ntb->reg;
int off = ctrl->spad_offset;
- void __iomem *base = ntb->reg;
+ void __iomem *base = (void __iomem *)ntb->reg;

writel(val, base + off + idx * sizeof(u32));
return 0;
--
2.34.1