linux-kernel - Re: [Broken] PCI: clean up resource alignment management

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Date:	Tue, 22 Apr 2008 14:59:46 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
cc:	Jeff Chua <jeff.chua.linux@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Greg KH <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Broken] PCI: clean up resource alignment management



On Wed, 23 Apr 2008, Ivan Kokshaysky wrote:
> 
> Yes, exactly. My fault - I somehow missed the cardbus stuff...

Ok, this patch looks sane, but ...

Don't cardbus bus resources work the same way as _normal_ IO resources, ie 
the alignment is the same as the size?

So I think we could clean this up a bit, and just use IORESOURCE_SIZEALIGN 
for Cardbus bridges, which leads to much more obvious code (ie just keep 
the base at zero)?

(In fact, I think cardbus bridges have a much more flexible alignment than 
that size thing, and can be aligned at finer granularity, but I forget the 
exact details, and since we didn't add a special "alignment" field, we 
can't take advantage of it anyway).

Patch entirely UNTESTED!

		Linus

---
 drivers/pci/setup-bus.c |   30 +++++++++++++++---------------
 1 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index f9b7bdd..8ddb918 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -416,13 +416,13 @@ static void pci_bus_size_cardbus(struct pci_bus *bus)
 	 * Reserve some resources for CardBus.  We reserve
 	 * a fixed amount of bus space for CardBus bridges.
 	 */
-	b_res[0].start = pci_cardbus_io_size;
-	b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1;
-	b_res[0].flags |= IORESOURCE_IO;
+	b_res[0].start = 0;
+	b_res[0].end = pci_cardbus_io_size - 1;
+	b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 
-	b_res[1].start = pci_cardbus_io_size;
-	b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1;
-	b_res[1].flags |= IORESOURCE_IO;
+	b_res[1].start = 0;
+	b_res[1].end = pci_cardbus_io_size - 1;
+	b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 
 	/*
 	 * Check whether prefetchable memory is supported
@@ -441,17 +441,17 @@ static void pci_bus_size_cardbus(struct pci_bus *bus)
 	 * twice the size.
 	 */
 	if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
-		b_res[2].start = pci_cardbus_mem_size;
-		b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1;
-		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
+		b_res[2].start = 0;
+		b_res[2].end = pci_cardbus_mem_size - 1;
+		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
 
-		b_res[3].start = pci_cardbus_mem_size;
-		b_res[3].end = b_res[3].start + pci_cardbus_mem_size - 1;
-		b_res[3].flags |= IORESOURCE_MEM;
+		b_res[3].start = 0;
+		b_res[3].end = pci_cardbus_mem_size - 1;
+		b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 	} else {
-		b_res[3].start = pci_cardbus_mem_size * 2;
-		b_res[3].end = b_res[3].start + pci_cardbus_mem_size * 2 - 1;
-		b_res[3].flags |= IORESOURCE_MEM;
+		b_res[3].start = 0;
+		b_res[3].end = pci_cardbus_mem_size * 2 - 1;
+		b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 	}
 }
 
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