* Donald Dutile ([email protected]) wrote:
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -581,7 +581,7 @@ int __init detect_intel_iommu(void)
> int alloc_iommu(struct dmar_drhd_unit *drhd)
> {
> struct intel_iommu *iommu;
> - int map_size;
> + resource_size_t map_size;
> u32 ver;
> static int iommu_allocated = 0;
> int agaw = 0;
> @@ -599,10 +599,17 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
> iommu->seq_id = iommu_allocated++;
> sprintf (iommu->name, "dmar%d", iommu->seq_id);
>
> - iommu->reg = ioremap(drhd->reg_base_addr, VTD_PAGE_SIZE);
I think it'd be nice to create a helper function that does the request
and map. This should include the map, read cap/ecap, calculate size and
possbily remap. Would probably simplify the error cleanup too.
> + iommu->reg_phys = drhd->reg_base_addr;
> + iommu->reg_size = VTD_PAGE_SIZE;
> + if (!request_mem_region(iommu->reg_phys, iommu->reg_size, iommu->name))
> {
> + printk(KERN_ERR "IOMMU: can't reserve memory\n");
> + goto error;
> + }
> +
> + iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size);
> if (!iommu->reg) {
> printk(KERN_ERR "IOMMU: can't map the region\n");
> - goto error;
> + goto err_release;
> }
> iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
> iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
> @@ -635,19 +642,26 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
> map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
> cap_max_fault_reg_offset(iommu->cap));
> map_size = VTD_PAGE_ALIGN(map_size);
> - if (map_size > VTD_PAGE_SIZE) {
> + if (map_size > iommu->reg_size) {
> iounmap(iommu->reg);
> - iommu->reg = ioremap(drhd->reg_base_addr, map_size);
> + release_mem_region(iommu->reg_phys, iommu->reg_size);
> + iommu->reg_size = map_size;
> + if (!request_mem_region(iommu->reg_phys, iommu->reg_size,
> + iommu->name)) {
> + printk(KERN_ERR "IOMMU: can't reserve memory\n");
> + goto error;
> + }
> + iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size);
> if (!iommu->reg) {
> printk(KERN_ERR "IOMMU: can't map the region\n");
> - goto error;
> + goto err_release;
> }
> }
>
> ver = readl(iommu->reg + DMAR_VER_REG);
> pr_info("IOMMU %d: reg_base_addr %llx ver %d:%d cap %llx ecap %llx\n",
> iommu->seq_id,
> - (unsigned long long)drhd->reg_base_addr,
> + (unsigned long long)iommu->reg_phys,
> DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
> (unsigned long long)iommu->cap,
> (unsigned long long)iommu->ecap);
> @@ -659,6 +673,8 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
>
> err_unmap:
> iounmap(iommu->reg);
> + err_release:
> + release_mem_region(iommu->reg_phys, iommu->reg_size);
> error:
> kfree(iommu);
> return -1;
> @@ -671,8 +687,11 @@ void free_iommu(struct intel_iommu *iommu)
>
> free_dmar_iommu(iommu);
>
> - if (iommu->reg)
> + if (iommu->reg) {
> iounmap(iommu->reg);
> + release_mem_region(iommu->reg_phys, iommu->reg_size);
> + }
> +
> kfree(iommu);
> }
>
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index e6ca56d..c6d132b 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -308,6 +308,8 @@ enum {
>
> struct intel_iommu {
> void __iomem *reg; /* Pointer to hardware regs, virtual addr */
> + resource_size_t reg_phys;
> + resource_size_t reg_size;
I'd make these u64
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