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72cb551495
Currently vring_use_dma_api always returns true when Linux is running on Xen due to a xen_domain check in vring_use_dma_api. This patch makes the check more flexible. Introduce a static inline function xen_vring_use_dma that returns true when dma_api should be used (override) and false when leaving it to the default. Return true only for x86 PV guests and false otherwise. Only PV guests benefit from forcing dma_api because they need special phys-machine address translations. Other guests cannot do special address translations anyway, so there is no point in force-enabling dma_api, especially when some drivers (e.g. RPMesg) are known not to work with dma_api. Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com> Suggested-by: Stefano Stabellini <stefano.stabellini@xilinx.com> Link: https://lore.kernel.org/r/20200624091732.23944-1-peng.fan@nxp.com Link: https://lore.kernel.org/r/20200711144334-mutt-send-email-mst@kernel.org State: waiting
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _XEN_XEN_H
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#define _XEN_XEN_H
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#include <linux/types.h>
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enum xen_domain_type {
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XEN_NATIVE, /* running on bare hardware */
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XEN_PV_DOMAIN, /* running in a PV domain */
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XEN_HVM_DOMAIN, /* running in a Xen hvm domain */
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};
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#ifdef CONFIG_XEN
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extern enum xen_domain_type xen_domain_type;
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#else
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#define xen_domain_type XEN_NATIVE
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#endif
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#ifdef CONFIG_XEN_PVH
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extern bool xen_pvh;
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#else
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#define xen_pvh 0
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#endif
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#define xen_domain() (xen_domain_type != XEN_NATIVE)
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#define xen_pv_domain() (xen_domain_type == XEN_PV_DOMAIN)
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#define xen_hvm_domain() (xen_domain_type == XEN_HVM_DOMAIN)
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#define xen_pvh_domain() (xen_pvh)
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extern uint32_t xen_start_flags;
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#ifdef CONFIG_XEN_PV
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extern bool xen_pv_pci_possible;
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#else
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#define xen_pv_pci_possible 0
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#endif
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#include <xen/interface/hvm/start_info.h>
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extern struct hvm_start_info pvh_start_info;
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void xen_prepare_pvh(void);
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struct pt_regs;
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void xen_pv_evtchn_do_upcall(struct pt_regs *regs);
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#ifdef CONFIG_XEN_DOM0
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#include <xen/interface/xen.h>
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#include <asm/xen/hypervisor.h>
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#define xen_initial_domain() (xen_domain() && \
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(xen_start_flags & SIF_INITDOMAIN))
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#else /* !CONFIG_XEN_DOM0 */
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#define xen_initial_domain() (0)
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#endif /* CONFIG_XEN_DOM0 */
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struct bio_vec;
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struct page;
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bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
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const struct page *page);
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#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_XEN_BALLOON)
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extern u64 xen_saved_max_mem_size;
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#endif
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#ifdef CONFIG_XEN_UNPOPULATED_ALLOC
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int xen_alloc_unpopulated_pages(unsigned int nr_pages, struct page **pages);
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void xen_free_unpopulated_pages(unsigned int nr_pages, struct page **pages);
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#include <linux/ioport.h>
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int arch_xen_unpopulated_init(struct resource **res);
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#else
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#include <xen/balloon.h>
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static inline int xen_alloc_unpopulated_pages(unsigned int nr_pages,
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struct page **pages)
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{
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return xen_alloc_ballooned_pages(nr_pages, pages);
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}
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static inline void xen_free_unpopulated_pages(unsigned int nr_pages,
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struct page **pages)
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{
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xen_free_ballooned_pages(nr_pages, pages);
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}
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#endif
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#if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI) && defined(CONFIG_X86)
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bool __init xen_processor_present(uint32_t acpi_id);
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#else
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#include <linux/bug.h>
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static inline bool xen_processor_present(uint32_t acpi_id)
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{
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BUG();
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return false;
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}
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#endif
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static inline int xen_vring_use_dma(void)
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{
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return xen_pv_domain();
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}
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#endif /* _XEN_XEN_H */
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