linux-kernel - [RFC PATCH 1/3] ata: Allocate PCI iomap table statically

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Message-ID: <20241204171033.86804-3-pstanner@redhat.com>
Date: Wed,  4 Dec 2024 18:10:32 +0100
From: Philipp Stanner <pstanner@...hat.com>
To: Damien Le Moal <dlemoal@...nel.org>,
	Niklas Cassel <cassel@...nel.org>,
	Mikael Pettersson <mikpelinux@...il.com>
Cc: linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Philipp Stanner <pstanner@...hat.com>
Subject: [RFC PATCH 1/3] ata: Allocate PCI iomap table statically

struct ata_host.iomap has been created and administrated so far by
pcim_iomap_table(), a problematic function that has been deprecated in
commit e354bb84a4c1c ("PCI: Deprecate pcim_iomap_table(),
pcim_iomap_regions_request_all()")

Ideally, drivers should not need a global table at all and should store
ioremaped BARs in their respective structs separately. For ATA, however,
it's far easier to deprecate pcim_iomap_table() by allocating struct
ata_host.iomap statically as an array of iomem pointers. Since
PCI_STD_NUM_BARS is currently defined to be 6, the memory overhead is
irrelevant.

Make struct ata_host.iomap a static iomem pointer table.

Signed-off-by: Philipp Stanner <pstanner@...hat.com>
---
 include/linux/libata.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/libata.h b/include/linux/libata.h
index c1a85d46eba6..d12a9627c96e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -23,6 +23,9 @@
 #include <linux/cdrom.h>
 #include <linux/sched.h>
 #include <linux/async.h>
+#ifdef CONFIG_PCI
+#include <linux/pci_regs.h> /* for PCI_STD_NUM_BARS */
+#endif /* CONFIG_PCI */
 
 /*
  * Define if arch has non-standard setup.  This is a _PCI_ standard
@@ -615,7 +618,9 @@ struct ata_ioports {
 struct ata_host {
 	spinlock_t		lock;
 	struct device 		*dev;
-	void __iomem * const	*iomap;
+#ifdef CONFIG_PCI
+	void __iomem		*iomap[PCI_STD_NUM_BARS];
+#endif /* CONFIG_PCI */
 	unsigned int		n_ports;
 	unsigned int		n_tags;			/* nr of NCQ tags */
 	void			*private_data;
-- 
2.47.0