drm/radeon/kms: make sure pci max read request size is valid on evergreen+ (v2)

If the bios or OS sets the pci max read request size to 0 or an
invalid value (6,7), it can result in a hang or slowdown.  Check
and set it to something sane if it's invalid.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=42162

v2: use pci reg defines from include/linux/pci_regs.h

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index d8d71a3..dc0a5b5 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -41,6 +41,31 @@ static void evergreen_gpu_init(struct radeon_device *rdev);
 void evergreen_fini(struct radeon_device *rdev);
 static void evergreen_pcie_gen2_enable(struct radeon_device *rdev);
 
+void evergreen_fix_pci_max_read_req_size(struct radeon_device *rdev)
+{
+       u16 ctl, v;
+       int cap, err;
+
+       cap = pci_pcie_cap(rdev->pdev);
+       if (!cap)
+               return;
+
+       err = pci_read_config_word(rdev->pdev, cap + PCI_EXP_DEVCTL, &ctl);
+       if (err)
+               return;
+
+       v = (ctl & PCI_EXP_DEVCTL_READRQ) >> 12;
+
+       /* if bios or OS sets MAX_READ_REQUEST_SIZE to an invalid value, fix it
+        * to avoid hangs or perfomance issues
+        */
+       if ((v == 0) || (v == 6) || (v == 7)) {
+               ctl &= ~PCI_EXP_DEVCTL_READRQ;
+               ctl |= (2 << 12);
+               pci_write_config_word(rdev->pdev, cap + PCI_EXP_DEVCTL, ctl);
+       }
+}
+
 void evergreen_pre_page_flip(struct radeon_device *rdev, int crtc)
 {
        /* enable the pflip int */
@@ -1863,6 +1888,8 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
 
        WREG32(GRBM_CNTL, GRBM_READ_TIMEOUT(0xff));
 
+       evergreen_fix_pci_max_read_req_size(rdev);
+
        cc_gc_shader_pipe_config = RREG32(CC_GC_SHADER_PIPE_CONFIG) & ~2;
 
        cc_gc_shader_pipe_config |=

diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
index a2e00fa..cbf57d7 100644 (file)
--- a/drivers/gpu/drm/radeon/ni.c
+++ b/drivers/gpu/drm/radeon/ni.c
@@ -39,6 +39,7 @@ extern int evergreen_mc_wait_for_idle(struct radeon_device *rdev);
 extern void evergreen_mc_program(struct radeon_device *rdev);
 extern void evergreen_irq_suspend(struct radeon_device *rdev);
 extern int evergreen_mc_init(struct radeon_device *rdev);
+extern void evergreen_fix_pci_max_read_req_size(struct radeon_device *rdev);
 
 #define EVERGREEN_PFP_UCODE_SIZE 1120
 #define EVERGREEN_PM4_UCODE_SIZE 1376
@@ -669,6 +670,8 @@ static void cayman_gpu_init(struct radeon_device *rdev)
 
        WREG32(GRBM_CNTL, GRBM_READ_TIMEOUT(0xff));
 
+       evergreen_fix_pci_max_read_req_size(rdev);
+
        mc_shared_chmap = RREG32(MC_SHARED_CHMAP);
        mc_arb_ramcfg = RREG32(MC_ARB_RAMCFG);