Le 19/08/2024 à 18:51, Philipp Stanner a écrit :
solidrun utilizes pcim_iomap_regions(), which has been deprecated by the
PCI subsystem in commit e354bb84a4c1 ("PCI: Deprecate
pcim_iomap_table(), pcim_iomap_regions_request_all()"), among other
things because it forces usage of quite a complicated bitmask mechanism.
The bitmask handling code can entirely be removed by replacing
pcim_iomap_regions() and pcim_iomap_table().
Replace pcim_iomap_regions() and pcim_iomap_table() with
pci_iomap_region().
Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx>
---
drivers/vdpa/solidrun/snet_main.c | 47 +++++++++++--------------------
1 file changed, 16 insertions(+), 31 deletions(-)
diff --git a/drivers/vdpa/solidrun/snet_main.c b/drivers/vdpa/solidrun/snet_main.c
index 99428a04068d..abf027ca35e1 100644
--- a/drivers/vdpa/solidrun/snet_main.c
+++ b/drivers/vdpa/solidrun/snet_main.c
@@ -556,33 +556,24 @@ static const struct vdpa_config_ops snet_config_ops = {
static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet)
{
char name[50];
- int ret, i, mask = 0;
+ int i;
+
+ snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev));
+
/* We don't know which BAR will be used to communicate..
* We will map every bar with len > 0.
*
* Later, we will discover the BAR and unmap all other BARs.
*/
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
- if (pci_resource_len(pdev, i))
- mask |= (1 << i);
- }
-
- /* No BAR can be used.. */
- if (!mask) {
- SNET_ERR(pdev, "Failed to find a PCI BAR\n");
- return -ENODEV;
- }
-
- snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev));
- ret = pcim_iomap_regions(pdev, mask, name);
- if (ret) {
- SNET_ERR(pdev, "Failed to request and map PCI BARs\n");
- return ret;
- }
+ if (pci_resource_len(pdev, i)) {
+ psnet->bars[i] = pcim_iomap_region(pdev, i, name);
Hi,
Unrelated to the patch, but is is safe to have 'name' be on the stack?
pcim_iomap_region()
--> __pcim_request_region()
--> __pcim_request_region_range()
--> request_region() or __request_mem_region()
--> __request_region()
--> __request_region_locked()
--> res->name = name;
So an address on the stack ends in the 'name' field of a "struct resource".
According to a few grep, it looks really unusual.
I don't know if it is used, but it looks strange to me.
If it is an issue, it was apparently already there before this patch.
+ if (IS_ERR(psnet->bars[i])) {
+ SNET_ERR(pdev, "Failed to request and map PCI BARs\n");
+ return PTR_ERR(psnet->bars[i]);
+ }
+ }
- for (i = 0; i < PCI_STD_NUM_BARS; i++) {
- if (mask & (1 << i))
- psnet->bars[i] = pcim_iomap_table(pdev)[i];
}
return 0;
@@ -591,18 +582,15 @@ static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet)
static int snet_open_vf_bar(struct pci_dev *pdev, struct snet *snet)
{
char name[50];
- int ret;
snprintf(name, sizeof(name), "snet[%s]-bar", pci_name(pdev));
/* Request and map BAR */
- ret = pcim_iomap_regions(pdev, BIT(snet->psnet->cfg.vf_bar), name);
- if (ret) {
+ snet->bar = pcim_iomap_region(pdev, snet->psnet->cfg.vf_bar, name);
Same
Just my 2c.
CJ
+ if (IS_ERR(snet->bar)) {
SNET_ERR(pdev, "Failed to request and map PCI BAR for a VF\n");
- return ret;
+ return PTR_ERR(snet->bar);
}
- snet->bar = pcim_iomap_table(pdev)[snet->psnet->cfg.vf_bar];
-
return 0;
}
@@ -650,15 +638,12 @@ static int psnet_detect_bar(struct psnet *psnet, u32 off)
static void psnet_unmap_unused_bars(struct pci_dev *pdev, struct psnet *psnet)
{
- int i, mask = 0;
+ int i;
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
if (psnet->bars[i] && i != psnet->barno)
- mask |= (1 << i);
+ pcim_iounmap_region(pdev, i);
}
-
- if (mask)
- pcim_iounmap_regions(pdev, mask);
}
/* Read SNET config from PCI BAR */
