[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v1 02/14] xen/pci: solve compilation error on ARM with HAS_PCI enabled
Hi Rahul,
On 19/08/2021 13:02, Rahul Singh wrote:
Compilation error is observed when HAS_PCI is enabled for ARM
architecture.
To be pedantic, what you are trying to solve is not a compilation error
but the fact that the PCI mandates helpers that doesn't yet exist on
Arm. So...
Add definition for arch_iommu_use_permitted() and
arch_pci_clean_pirqs().Implement dummy functions for pci_conf_read*() to
fix compilation error.
... I am not really in favor of adding dummy implementation here.
Instead, the series should be re-ordered so we add the pci-access
helpers first and then enable HAS_PCI towards the end of the series.
pci.c: In function ‘deassign_device’:
pci.c:849:49: error: implicit declaration of function ‘pci_to_dev’;
did you mean ‘dt_to_dev’? [-Werror=implicit-function-declaration]
pci_to_dev(pdev));
pci.c:18: undefined reference to `pci_conf_read16’
pci.c:880: undefined reference to `arch_pci_clean_pirqs’
pci.c:1392: undefined reference to `arch_iommu_use_permitted'
Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
---
xen/arch/arm/Makefile | 1 +
xen/arch/arm/pci/Makefile | 2 +
xen/arch/arm/pci/pci-access.c | 61 +++++++++++++++++++++++++++++
xen/arch/arm/pci/pci.c | 32 +++++++++++++++
xen/drivers/passthrough/arm/iommu.c | 5 +++
xen/include/asm-arm/pci.h | 33 ++++++++++++++--
6 files changed, 131 insertions(+), 3 deletions(-)
create mode 100644 xen/arch/arm/pci/Makefile
create mode 100644 xen/arch/arm/pci/pci-access.c
create mode 100644 xen/arch/arm/pci/pci.c
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 3d3b97b5b4..0e14a5e5c8 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -6,6 +6,7 @@ ifneq ($(CONFIG_NO_PLAT),y)
obj-y += platforms/
endif
obj-$(CONFIG_TEE) += tee/
+obj-$(CONFIG_HAS_PCI) += pci/
obj-$(CONFIG_HAS_ALTERNATIVE) += alternative.o
obj-y += bootfdt.init.o
diff --git a/xen/arch/arm/pci/Makefile b/xen/arch/arm/pci/Makefile
new file mode 100644
index 0000000000..a9ee0b9b44
--- /dev/null
+++ b/xen/arch/arm/pci/Makefile
@@ -0,0 +1,2 @@
+obj-y += pci.o
+obj-y += pci-access.o
diff --git a/xen/arch/arm/pci/pci-access.c b/xen/arch/arm/pci/pci-access.c
new file mode 100644
index 0000000000..b938047c03
--- /dev/null
+++ b/xen/arch/arm/pci/pci-access.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2021 Arm Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/pci.h>
+
+static uint32_t pci_config_read(pci_sbdf_t sbdf, unsigned int reg,
+ unsigned int len)
+{
+ return ~0U;
+}
+
+static void pci_config_write(pci_sbdf_t sbdf, unsigned int reg,
+ unsigned int len, uint32_t val)
+{
+}
+
+/*
+ * Wrappers for all PCI configuration access functions.
+ */
+
+#define PCI_OP_WRITE(size, type) \
+ void pci_conf_write##size (pci_sbdf_t sbdf,unsigned int reg, type val) \
+{ \
+ pci_config_write(sbdf, reg, size / 8, val); \
+}
+
+#define PCI_OP_READ(size, type) \
+ type pci_conf_read##size (pci_sbdf_t sbdf, unsigned int reg) \
+{ \
+ return pci_config_read(sbdf, reg, size / 8); \
+}
+
+PCI_OP_READ(8, u8)
+PCI_OP_READ(16, u16)
+PCI_OP_READ(32, u32)
+PCI_OP_WRITE(8, u8)
+PCI_OP_WRITE(16, u16)
+PCI_OP_WRITE(32, u32)
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c
new file mode 100644
index 0000000000..dc55d23778
--- /dev/null
+++ b/xen/arch/arm/pci/pci.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2021 Arm Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/pci.h>
+
+int arch_pci_clean_pirqs(struct domain *d)
+{
+ return 0;
+}
Please add a comment explaining why this just returns 0.
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/drivers/passthrough/arm/iommu.c
b/xen/drivers/passthrough/arm/iommu.c
index db3b07a571..fdec1c5547 100644
--- a/xen/drivers/passthrough/arm/iommu.c
+++ b/xen/drivers/passthrough/arm/iommu.c
@@ -135,3 +135,8 @@ void arch_iommu_domain_destroy(struct domain *d)
void __hwdom_init arch_iommu_hwdom_init(struct domain *d)
{
}
+
+bool arch_iommu_use_permitted(const struct domain *d)
+{
+ return true;
+}
Please add a comment explaining why returning true is always fine.
diff --git a/xen/include/asm-arm/pci.h b/xen/include/asm-arm/pci.h
index de13359f65..61e43da088 100644
--- a/xen/include/asm-arm/pci.h
+++ b/xen/include/asm-arm/pci.h
@@ -1,7 +1,34 @@
-#ifndef __X86_PCI_H__
-#define __X86_PCI_H__
+/*
+ * Copyright (C) 2021 Arm Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ARM_PCI_H__
+#define __ARM_PCI_H__
+
+#ifdef CONFIG_HAS_PCI
+
+#define pci_to_dev(pcidev) (&(pcidev)->arch.dev)
+
+/* Arch pci dev struct */
struct arch_pci_dev {
+ struct device dev;
};
-#endif /* __X86_PCI_H__ */
+#else /*!CONFIG_HAS_PCI*/
+
+struct arch_pci_dev { };
+
+#endif /*!CONFIG_HAS_PCI*/
+#endif /* __ARM_PCI_H__ */
--
Julien Grall
|
