svn commit: r306359 - head/sys/dev/pci
Sepherosa Ziehau
sephe at FreeBSD.org
Tue Sep 27 06:00:11 UTC 2016
Author: sephe
Date: Tue Sep 27 06:00:10 2016
New Revision: 306359
URL: https://svnweb.freebsd.org/changeset/base/306359
Log:
pci: Clear the MEM/PORT_EN bit when updating PCI BAR
It's unsafe to update the BAR when the related EN bit is set.
Submitted by: Dexuan Cui <decui microsoft com>
Reviewed by: jhb
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D7914
Modified:
head/sys/dev/pci/pci.c
Modified: head/sys/dev/pci/pci.c
==============================================================================
--- head/sys/dev/pci/pci.c Tue Sep 27 00:53:41 2016 (r306358)
+++ head/sys/dev/pci/pci.c Tue Sep 27 06:00:10 2016 (r306359)
@@ -5000,6 +5000,7 @@ pci_reserve_map(device_t dev, device_t c
struct resource_list *rl = &dinfo->resources;
struct resource *res;
struct pci_map *pm;
+ uint16_t cmd;
pci_addr_t map, testval;
int mapsize;
@@ -5089,8 +5090,17 @@ pci_reserve_map(device_t dev, device_t c
device_printf(child,
"Lazy allocation of %#jx bytes rid %#x type %d at %#jx\n",
count, *rid, type, rman_get_start(res));
+
+ /* Disable decoding via the CMD register before updating the BAR */
+ cmd = pci_read_config(child, PCIR_COMMAND, 2);
+ pci_write_config(child, PCIR_COMMAND,
+ cmd & ~(PCI_BAR_MEM(map) ? PCIM_CMD_MEMEN : PCIM_CMD_PORTEN), 2);
+
map = rman_get_start(res);
pci_write_bar(child, pm, map);
+
+ /* Restore the original value of the CMD register */
+ pci_write_config(child, PCIR_COMMAND, cmd, 2);
out:
return (res);
}
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