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PCI: Increase Resizable BAR support from 512 GB to 128 TB

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Per PCIe r6.0, sec 7.8.6.2, devices can advertise Resizable BAR sizes up to
128 TB in the Resizable BAR Capability register.  Larger sizes can be
advertised via the Capability register, but that requires an API change.

Update pci_rebar_get_possible_sizes() and pbus_size_mem() to increase the
sizes we currently support from 512 GB to 128 TB.

Link: https://lore.kernel.org/r/20250307053535.44918-1-daizhiyuan@phytium.com.cn
Signed-off-by: Zhiyuan Dai <daizhiyuan@phytium.com.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Zhiyuan Dai 2025-03-07 13:35:29 +08:00 committed by Bjorn Helgaas
parent 2499f53484
commit 5af473941b
3 changed files with 4 additions and 4 deletions
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4
drivers/pci/pci.c
View File

@ -3757,7 +3757,7 @@ static int pci_rebar_find_pos(struct pci_dev *pdev, int bar)
* @bar: BAR to query
*
* Get the possible sizes of a resizable BAR as bitmask defined in the spec
* (bit 0=1MB, bit 19=512GB). Returns 0 if BAR isn't resizable.
* (bit 0=1MB, bit 31=128TB). Returns 0 if BAR isn't resizable.
*/
u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar)
{
@ -3805,7 +3805,7 @@ int pci_rebar_get_current_size(struct pci_dev *pdev, int bar)
* pci_rebar_set_size - set a new size for a BAR
* @pdev: PCI device
* @bar: BAR to set size to
* @size: new size as defined in the spec (0=1MB, 19=512GB)
* @size: new size as defined in the spec (0=1MB, 31=128TB)
*
* Set the new size of a BAR as defined in the spec.
* Returns zero if resizing was successful, error code otherwise.

2
drivers/pci/setup-bus.c
View File

@ -1159,7 +1159,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
{
struct pci_dev *dev;
resource_size_t min_align, win_align, align, size, size0, size1 = 0;
resource_size_t aligns[24]; /* Alignments from 1MB to 8TB */
resource_size_t aligns[28]; /* Alignments from 1MB to 128TB */
int order, max_order;
struct resource *b_res = find_bus_resource_of_type(bus,
mask | IORESOURCE_PREFETCH, type);

2
include/uapi/linux/pci_regs.h
View File

@ -1013,7 +1013,7 @@
/* Resizable BARs */
#define PCI_REBAR_CAP 4 /* capability register */
#define PCI_REBAR_CAP_SIZES 0x00FFFFF0 /* supported BAR sizes */
#define PCI_REBAR_CAP_SIZES 0xFFFFFFF0 /* supported BAR sizes */
#define PCI_REBAR_CTRL 8 /* control register */
#define PCI_REBAR_CTRL_BAR_IDX 0x00000007 /* BAR index */
#define PCI_REBAR_CTRL_NBAR_MASK 0x000000E0 /* # of resizable BARs */