[PATCH v2 kvmtool 20/30] pci: Add helpers for BAR values and memory/IO space access

[Alexandru Elisei <alexandru.elisei@arm.com>]

We're going to be checking the BAR type, the address written to it and
if access to memory or I/O space is enabled quite often when we add
support for reasignable BARs, add helpers for it.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 include/kvm/pci.h | 48 +++++++++++++++++++++++++++++++++++++++++++++++
 pci.c             |  2 +-
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/include/kvm/pci.h b/include/kvm/pci.h
index ccb155e3e8fe..235cd82fff3c 100644
--- a/include/kvm/pci.h
+++ b/include/kvm/pci.h
@@ -5,6 +5,7 @@
 #include <linux/kvm.h>
 #include <linux/pci_regs.h>
 #include <endian.h>
+#include <stdbool.h>
 
 #include "kvm/devices.h"
 #include "kvm/msi.h"
@@ -161,4 +162,51 @@ void pci__config_rd(struct kvm *kvm, union pci_config_address addr, void *data,
 
 void *pci_find_cap(struct pci_device_header *hdr, u8 cap_type);
 
+static inline bool __pci__memory_space_enabled(u16 command)
+{
+	return command & PCI_COMMAND_MEMORY;
+}
+
+static inline bool pci__memory_space_enabled(struct pci_device_header *pci_hdr)
+{
+	return __pci__memory_space_enabled(pci_hdr->command);
+}
+
+static inline bool __pci__io_space_enabled(u16 command)
+{
+	return command & PCI_COMMAND_IO;
+}
+
+static inline bool pci__io_space_enabled(struct pci_device_header *pci_hdr)
+{
+	return __pci__io_space_enabled(pci_hdr->command);
+}
+
+static inline bool __pci__bar_is_io(u32 bar)
+{
+	return bar & PCI_BASE_ADDRESS_SPACE_IO;
+}
+
+static inline bool pci__bar_is_io(struct pci_device_header *pci_hdr, int bar_num)
+{
+	return __pci__bar_is_io(pci_hdr->bar[bar_num]);
+}
+
+static inline bool pci__bar_is_memory(struct pci_device_header *pci_hdr, int bar_num)
+{
+	return !pci__bar_is_io(pci_hdr, bar_num);
+}
+
+static inline u32 __pci__bar_address(u32 bar)
+{
+	if (__pci__bar_is_io(bar))
+		return bar & PCI_BASE_ADDRESS_IO_MASK;
+	return bar & PCI_BASE_ADDRESS_MEM_MASK;
+}
+
+static inline u32 pci__bar_address(struct pci_device_header *pci_hdr, int bar_num)
+{
+	return __pci__bar_address(pci_hdr->bar[bar_num]);
+}
+
 #endif /* KVM__PCI_H */
diff --git a/pci.c b/pci.c
index b6892d974c08..4f7b863298f6 100644
--- a/pci.c
+++ b/pci.c
@@ -185,7 +185,7 @@ void pci__config_wr(struct kvm *kvm, union pci_config_address addr, void *data,
 	 * size, it will write the address back.
 	 */
 	if (bar < 6) {
-		if (pci_hdr->bar[bar] & PCI_BASE_ADDRESS_SPACE_IO)
+		if (pci__bar_is_io(pci_hdr, bar))
 			mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
 		else
 			mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
-- 
2.20.1