On Tue, 23 Jun 2015 21:30:38 +0200
Lucas Stach <dev@xxxxxxxxxx> wrote:
> The probe code now does a much better job at detecting bad BARs.
> Also make sure to preserve any previous content of the BAR
> registers if we don't relocate them.
>
> Signed-off-by: Lucas Stach <dev@xxxxxxxxxx>
> ---
> I hope this fixes the problems seen with new versions of QEMU on
> MIPS malta.
I have just tested this patchseries. The qemu problems are fixed, thanks!
> ---
> drivers/pci/pci.c | 39 ++++++++++++++++++++++++++++++++++-----
> 1 file changed, 34 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 3a0e7a5..1e45907 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -129,10 +129,24 @@ static struct pci_dev *alloc_pci_dev(void)
> return dev;
> }
>
> +static u32 pci_size(u32 base, u32 maxbase, u32 mask)
> +{
> + u32 size = maxbase & mask;
> + if (!size)
> + return 0;
> +
> + size = (size & ~(size-1)) - 1;
> +
> + if (base == maxbase && ((base | size) & mask) != mask)
> + return 0;
> +
> + return size + 1;
> +}
> +
> +
> static void setup_device(struct pci_dev *dev, int max_bar)
> {
> - int bar, size;
> - u32 mask;
> + int bar;
> u8 cmd;
>
> pci_read_config_byte(dev, PCI_COMMAND, &cmd);
> @@ -141,9 +155,12 @@ static void setup_device(struct pci_dev *dev, int max_bar)
>
> for (bar = 0; bar < max_bar; bar++) {
> resource_size_t last_addr;
> + u32 orig, mask, size;
>
> + pci_read_config_dword(dev, PCI_BASE_ADDRESS_0 + bar * 4, &orig);
> pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + bar * 4, 0xfffffffe);
> pci_read_config_dword(dev, PCI_BASE_ADDRESS_0 + bar * 4, &mask);
> + pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + bar * 4, orig);
>
> if (mask == 0 || mask == 0xffffffff) {
> pr_debug("pbar%d set bad mask\n", bar);
> @@ -151,7 +168,11 @@ static void setup_device(struct pci_dev *dev, int max_bar)
> }
>
> if (mask & 0x01) { /* IO */
> - size = ((~(mask & 0xfffffffe)) & 0xffff) + 1;
> + size = pci_size(orig, mask, 0xfffffffe);
> + if (!size) {
> + pr_debug("pbar%d bad IO mask\n", bar);
> + continue;
> + }
> pr_debug("pbar%d: mask=%08x io %d bytes\n", bar, mask, size);
> if (last_io + size >
> dev->bus->resource[PCI_BUS_RESOURCE_IO]->end) {
> @@ -164,7 +185,11 @@ static void setup_device(struct pci_dev *dev, int max_bar)
> last_io += size;
> } else if ((mask & PCI_BASE_ADDRESS_MEM_PREFETCH) &&
> last_mem_pref) /* prefetchable MEM */ {
> - size = (~(mask & 0xfffffff0)) + 1;
> + size = pci_size(orig, mask, 0xfffffff0);
> + if (!size) {
> + pr_debug("pbar%d bad P-MEM mask\n", bar);
> + continue;
> + }
> pr_debug("pbar%d: mask=%08x P memory %d bytes\n",
> bar, mask, size);
> if (last_mem_pref + size >
> @@ -178,7 +203,11 @@ static void setup_device(struct pci_dev *dev, int max_bar)
> last_addr = last_mem_pref;
> last_mem_pref += size;
> } else { /* non-prefetch MEM */
> - size = (~(mask & 0xfffffff0)) + 1;
> + size = pci_size(orig, mask, 0xfffffff0);
> + if (!size) {
> + pr_debug("pbar%d bad NP-MEM mask\n", bar);
> + continue;
> + }
> pr_debug("pbar%d: mask=%08x NP memory %d bytes\n",
> bar, mask, size);
> if (last_mem + size >
> --
> 2.1.0
>
--
--
Best regards,
Antony Pavlov
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