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PCI: endpoint: Make *_free_bar() to return error codes on failure

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[ Upstream commit 0e27aeccfa3d1bab7c6a29fb8e6fcedbad7b09a8 ]

Modify pci_epc_get_next_free_bar() and pci_epc_get_first_free_bar() to
return error values if there are no free BARs available.

Link: https://lore.kernel.org/r/20210201195809.7342-5-kishon@ti.com
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kishon Vijay Abraham I 2021-02-02 01:27:56 +05:30 committed by Greg Kroah-Hartman
parent d98bfd4cc2
commit d5e85b92b4
4 changed files with 13 additions and 10 deletions
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2
drivers/pci/endpoint/functions/pci-epf-test.c
View File

@ -834,6 +834,8 @@ static int pci_epf_test_bind(struct pci_epf *epf)
linkup_notifier = epc_features->linkup_notifier;
core_init_notifier = epc_features->core_init_notifier;
test_reg_bar = pci_epc_get_first_free_bar(epc_features);
if (test_reg_bar < 0)
return -EINVAL;
pci_epf_configure_bar(epf, epc_features);
}

12
drivers/pci/endpoint/pci-epc-core.c
View File

@ -90,8 +90,8 @@ EXPORT_SYMBOL_GPL(pci_epc_get);
* Invoke to get the first unreserved BAR that can be used by the endpoint
* function. For any incorrect value in reserved_bar return '0'.
*/
unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
*epc_features)
enum pci_barno
pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features)
{
return pci_epc_get_next_free_bar(epc_features, BAR_0);
}
@ -105,13 +105,13 @@ EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
* Invoke to get the next unreserved BAR starting from @bar that can be used
* for endpoint function. For any incorrect value in reserved_bar return '0'.
*/
unsigned int pci_epc_get_next_free_bar(const struct pci_epc_features
*epc_features, enum pci_barno bar)
enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
*epc_features, enum pci_barno bar)
{
unsigned long free_bar;
if (!epc_features)
return 0;
return BAR_0;
/* If 'bar - 1' is a 64-bit BAR, move to the next BAR */
if ((epc_features->bar_fixed_64bit << 1) & 1 << bar)
@ -126,7 +126,7 @@ unsigned int pci_epc_get_next_free_bar(const struct pci_epc_features
free_bar = find_next_zero_bit(&free_bar, 6, bar);
if (free_bar > 5)
return 0;
return NO_BAR;
return free_bar;
}

8
include/linux/pci-epc.h
View File

@ -201,10 +201,10 @@ int pci_epc_start(struct pci_epc *epc);
void pci_epc_stop(struct pci_epc *epc);
const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
u8 func_no);
unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
*epc_features);
unsigned int pci_epc_get_next_free_bar(const struct pci_epc_features
*epc_features, enum pci_barno bar);
enum pci_barno
pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
*epc_features, enum pci_barno bar);
struct pci_epc *pci_epc_get(const char *epc_name);
void pci_epc_put(struct pci_epc *epc);

1
include/linux/pci-epf.h
View File

@ -21,6 +21,7 @@ enum pci_notify_event {
};
enum pci_barno {
NO_BAR = -1,
BAR_0,
BAR_1,
BAR_2,