From: Alan Mikhak <alan.mikhak@sifive.com>
To: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
kishon@ti.com, lorenzo.pieralisi@arm.com,
linux-riscv@lists.infradead.org, palmer@sifive.com,
paul.walmsley@sifive.com
Cc: Alan Mikhak <alan.mikhak@sifive.com>
Subject: [PATCH v2] PCI: endpoint: Skip odd BAR when skipping 64bit BAR
Date: Thu, 23 May 2019 14:55:40 -0700 [thread overview]
Message-ID: <1558648540-14239-1-git-send-email-alan.mikhak@sifive.com> (raw)
Always skip odd bar when skipping 64bit BARs in pci_epf_test_set_bar()
and pci_epf_test_alloc_space().
Otherwise, pci_epf_test_set_bar() will call pci_epc_set_bar() on odd loop
index when skipping reserved 64bit BAR. Moreover, pci_epf_test_alloc_space()
will call pci_epf_alloc_space() on bind for odd loop index when BAR is 64bit
but leaks on subsequent unbind by not calling pci_epf_free_space().
Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com>
Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 27806987e93b..96156a537922 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -389,7 +389,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
static int pci_epf_test_set_bar(struct pci_epf *epf)
{
- int bar;
+ int bar, add;
int ret;
struct pci_epf_bar *epf_bar;
struct pci_epc *epc = epf->epc;
@@ -400,8 +400,14 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
epc_features = epf_test->epc_features;
- for (bar = BAR_0; bar <= BAR_5; bar++) {
+ for (bar = BAR_0; bar <= BAR_5; bar += add) {
epf_bar = &epf->bar[bar];
+ /*
+ * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
+ * if the specific implementation required a 64-bit BAR,
+ * even if we only requested a 32-bit BAR.
+ */
+ add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
if (!!(epc_features->reserved_bar & (1 << bar)))
continue;
@@ -413,13 +419,6 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
if (bar == test_reg_bar)
return ret;
}
- /*
- * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
- * if the specific implementation required a 64-bit BAR,
- * even if we only requested a 32-bit BAR.
- */
- if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
- bar++;
}
return 0;
@@ -431,7 +430,7 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
struct device *dev = &epf->dev;
struct pci_epf_bar *epf_bar;
void *base;
- int bar;
+ int bar, add;
enum pci_barno test_reg_bar = epf_test->test_reg_bar;
const struct pci_epc_features *epc_features;
@@ -445,8 +444,10 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
}
epf_test->reg[test_reg_bar] = base;
- for (bar = BAR_0; bar <= BAR_5; bar++) {
+ for (bar = BAR_0; bar <= BAR_5; bar += add) {
epf_bar = &epf->bar[bar];
+ add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
+
if (bar == test_reg_bar)
continue;
@@ -459,8 +460,6 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
dev_err(dev, "Failed to allocate space for BAR%d\n",
bar);
epf_test->reg[bar] = base;
- if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
- bar++;
}
return 0;
--
2.7.4
next reply other threads:[~2019-05-23 21:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-23 21:55 Alan Mikhak [this message]
2019-05-23 23:55 ` [PATCH v2] PCI: endpoint: Skip odd BAR when skipping 64bit BAR Alan Mikhak
2019-05-24 8:49 ` Kishon Vijay Abraham I
2019-05-24 18:50 ` Alan Mikhak
2019-05-30 16:22 ` Lorenzo Pieralisi
2019-05-31 4:35 ` Kishon Vijay Abraham I
2019-05-31 16:52 ` Alan Mikhak
2019-05-24 8:49 ` Kishon Vijay Abraham I
2019-06-03 7:34 ` Kishon Vijay Abraham I
2019-06-11 10:08 ` Lorenzo Pieralisi
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