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Fri, 09 Oct 2020 01:00:16 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id u17sm11634118wri.45.2020.10.09.01.00.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 01:00:16 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Bjorn Helgaas , linux-pci@vger.kernel.org Subject: [PATCH v2 17/17] drm/i915: Properly request PCI BARs Date: Fri, 9 Oct 2020 09:59:34 +0200 Message-Id: <20201009075934.3509076-18-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201009075934.3509076-1-daniel.vetter@ffwll.ch> References: <20201009075934.3509076-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When trying to test my CONFIG_IO_STRICT_DEVMEM changes I realized they do nothing for i915. Because i915 doesn't request any regions, like pretty much all drm pci drivers. I guess this is some very old remnants from the userspace modesetting days, when we wanted to co-exist with the fbdev driver. Which usually requested these resources. But makes me wonder why the pci subsystem doesn't just request resource automatically when we map a bar and a pci driver is bound? Knowledge about which pci bars we need kludged together from intel_uncore.c and intel_gtt.c from i915 and intel-gtt.c over in the fake agp driver. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org --- drivers/gpu/drm/i915/intel_uncore.c | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 54e201fdeba4..ce39049d8919 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -1692,10 +1692,13 @@ static int uncore_mmio_setup(struct intel_uncore *uncore) struct pci_dev *pdev = i915->drm.pdev; int mmio_bar; int mmio_size; + int bar_selection; + int ret; mmio_bar = IS_GEN(i915, 2) ? 1 : 0; + bar_selection = BIT (2) | BIT(mmio_bar); /* - * Before gen4, the registers and the GTT are behind different BARs. + * On gen3 the registers and the GTT are behind different BARs. * However, from gen4 onwards, the registers and the GTT are shared * in the same BAR, so we want to restrict this ioremap from * clobbering the GTT which we want ioremap_wc instead. Fortunately, @@ -1703,6 +1706,8 @@ static int uncore_mmio_setup(struct intel_uncore *uncore) * generations up to Ironlake. * For dgfx chips register range is expanded to 4MB. */ + if (INTEL_GEN(i915) == 3) + bar_selection |= BIT(3); if (INTEL_GEN(i915) < 5) mmio_size = 512 * 1024; else if (IS_DGFX(i915)) @@ -1710,8 +1715,15 @@ static int uncore_mmio_setup(struct intel_uncore *uncore) else mmio_size = 2 * 1024 * 1024; + ret = pci_request_selected_regions(pdev, bar_selection, "i915"); + if (ret < 0) { + drm_err(&i915->drm, "failed to request pci bars\n"); + return ret; + } + uncore->regs = pci_iomap(pdev, mmio_bar, mmio_size); if (uncore->regs == NULL) { + pci_release_selected_regions(pdev, bar_selection); drm_err(&i915->drm, "failed to map registers\n"); return -EIO; } @@ -1721,9 +1733,18 @@ static int uncore_mmio_setup(struct intel_uncore *uncore) static void uncore_mmio_cleanup(struct intel_uncore *uncore) { - struct pci_dev *pdev = uncore->i915->drm.pdev; + struct drm_i915_private *i915 = uncore->i915; + struct pci_dev *pdev = i915->drm.pdev; + int mmio_bar; + int bar_selection; + + mmio_bar = IS_GEN(i915, 2) ? 1 : 0; + bar_selection = BIT (2) | BIT(mmio_bar); + if (INTEL_GEN(i915) == 3) + bar_selection |= BIT(3); pci_iounmap(pdev, uncore->regs); + pci_release_selected_regions(pdev, bar_selection); } void intel_uncore_init_early(struct intel_uncore *uncore,